Management of Off-Highway Plant and Equipment PDF
Management of Off-Highway Plant and Equipment PDF
Management of Off-Highway Plant and Equipment PDF
equipment
Dr David J. Edwards BSc, PhD, FFB, MCMPE, is a Lecturer and Researcher at the Off-
highway Plant and Equipment Research Centre, Loughborough University, UK.
Frank C. Harris BEng, MSc, PhD, DSc, CEng, FCIOB, MICE, is Emeritus Professor
of Construction Science at the University of Wolverhampton, UK.
Ronald McCaffer BSc, PhD, DSc, FREng, FICE, FCIOB, MASCE, MCIM, Eur Ing,
is a Professor of Construction Management at Loughborough University, UK.
Management of off-highway plant
and equipment
David J. Edwards, Frank C. Harris and Ronald McCaffer
1 Introduction 1
5
PART I Organisation for business
4.1 Bulldozer 25
6.3 Sensitivity of the rate of return to the hire rate and the 95
utilisation of an item of equipment
10.2 Core components of the health and safety management loop 196
5.9 Proposal 1 present worth allowing for 12% inflation for Example 73
5.7
5.18 Cash flows for keeping existing equipment and its replacements 84
for Example 5.12
6.10 Cash flow estimates for purchasing and hiring an item of 100
equipment
6.14 Cash flows recorded during the execution of the project 103
6.17 Cash flows and NPV calculation for outright purchase including 110
tax saving from capital allowances used immediately
6.18 Net cash flow for the leasing alternative including tax 111
considerations
6.19 NPV of outright purchase with a delay to year 2 in using capital 112
allowances
6.20 NPV of outright purchase with a delay to year 3 in using capital 112
allowances
6.21 NPV of outright purchase with capital allowances used in years 2 113
and 3
7.5 The conventional method for calculating an economic hire rate 130
15.1 Summary of cash flows, contributions and stocks for 12 months 277
15.2 Summary of profit and cash flows for 12 months with overheads 278
included
15.4 A tabular form for the construction of a cash flow forecast for 280
trading operations
15.6 Cash flow for normal trading from Table 15.2, plus cash flows 284
associated with plant acquisition and disposal from Table 15.5
15.7 Headings for the cash flow forecast for acquisitions and 285
disposals
The authors are particularly grateful, first and foremost to: Mr Barry Robinson, President
of OPERC and Mr Richard Sharp, JCB. Our thanks are also extended to the following
professional practitioners: Mr Alex Hillman, Finning; Mr Dick Stewart, Liebherr; Mr
John Kerr, Scottish Plant Owners Association; Mr Bob Merchant, Contractors
Mechanical Plant Engineers; Mr Michael Plummer, Marubeni Komatsu and Bomag.
We also thank fellow academics, friends and colleagues who have contributed to this,
and previous editions of this textbook. In particular, Dr John Nicholas and Dr Gary Holt
for their constructive comments, suggestions and checking various sections of the text.
Finally, thanks to Professor Andrew Baldwin, Loughborough University, for all his
support and encouragement throughout the preparation of this textbook and other
research activities and to Major Martin Morris, Defence Logistics Organisation, UK
Ministry of Defence for the text on Global Positioning Systems.
Chapter 1
Introduction
As markets globalise and expand, organisations face fierce domestic and international
competition for complementary goods and services. In order to maintain competitiveness,
organisations must look inwardly for efficiency gains. One way that these gains can be
acquired is from initiatives to reduce labour costs and increase production output. The
acquisition (or hire) of off-highway plant and equipment often presents itself as a viable
option for organisations that strive to meet these challenges and maximise efficiency and
hence, profitability. Off-highway plant and equipment includes items such as dump
trucks, rough terrain forklift trucks, skid steer loaders and tracked hydraulic excavators.
These versatile machines provide a considerable contribution to the industrialised
economy and have been adapted for use in many bespoke operational environments,
ranging from civil engineering and construction to opencast mining, forestry, aggregates
and the scrap metal industry.
In demonstrating industry’s reliance upon mechanisation, the chief economist at a
major plant manufacturer recently estimated (c. 2001) that each year, over 20,000 plant
items are sold to the UK construction industry alone; a market which is valued at £1.2
billion per annum. Each plant item has an average (mean) life expectancy of ten years
and therefore, at any given time, over 200,000 plant items are working within the UK
construction sector. As each individual item of ‘mobile’ equipment can cost anywhere
between £10,000 and £10,000,000 (UK Sterling), it is hardly surprising therefore that
capital invested in such equipment is currently valued at £6 billion (at c. 2000 prices
sterling, when taking into account depreciation). With a further £6 billion being spent on
running costs (such as consumables, labour, parts and servicing), the total invested in
plant and equipment, at any given time, is therefore approximately £12 billion. Since the
construction industry itself is worth £58 billion (about 10 per cent of Gross Domestic
Product), the value of plant equates to almost a fifth of construction’s worth.
To raise production and simultaneously lower costs, each machine must be operated
and maintained efficiently and safely by competent operators. Currently, a workforce of
300,000 plant operators holds operator cards within industry, of which at least 150,000
operate within the construction sector; although, an estimated 600,000 operator cards
have been issued to date. Therefore with a workforce size of 1.4 million, the ratio of plant
to labour is low at 1:7 (approximately). This trend for the wider application of
mechanisation and thus, more operators, is set to continue as industry strives to improve
performance. Operator development is therefore an essential part of a plant and
equipment management strategy.
The potentially substantial cost of capital purchase has engendered the expansion of an
independent hire sector to supply the growing demand for mechanical equipment within
Management of off-highway plant and equipment 2
industry. Within the UK (unlike continental Europe) plant hire companies now dominate
the purchase of off-highway plant and equipment. Equipment hire companies serve two
purposes.
1 They provide specialised equipment which no single company could expect to utilise
fully, had the machine been purchased (e.g. harvest vehicles which are subject to
seasonal demand).
2 They hold substantial stocks of everyday items of equipment, thereby relieving industry
of the need to own and manage their own fleets, if they so choose.
In both instances, the organisations hiring the plant are freed from the burden of capital
item acquisition which ultimately ties up organisation liquidity and prevents capital being
used in more profitable areas. In addition, items are hired and off-hired as and when
required therefore avoiding depreciation costs. Equipment hire firms have rapidly
acquired specific management skills, which are peculiar to owning and operating
equipment. This has stimulated them to operate their equipment more efficiently and
perhaps more profitably than an individual company holding a small fleet.
Regardless of the plant items used or whether these are hired or owned, managers
within the business enterprise are required to transform mechanical resources into
products and services. By hiring the machine, the responsibility for plant management is
partially transferred to a third party to maintain the item in a safe operational condition.
However, the hirer can never transfer the total responsibility because ultimately the item
is still used even though it is hired, hence it must still be managed. Even in the fully
automated industrial environment, where manual workers are kept to a minimum level,
managers will always be required. Plant managers have increasingly more autonomy,
responsibility and decision-making power. Most are confronted with fundamentally
important challenges on a weekly or monthly basis. On a macro level, the broadest
challenge is to ensure company survival in an extremely competitive economic
environment. More specific challenges include:
1 Achieving near maximum utilisation of equipment so as to generate adequate revenue
and a sufficient return on capital.
2 Delivering a high quality service to clients in order to secure future contracts.
3 Managing cultural and technological changes efficiently and effectively.
Consequently, managers who hold large (capital intensive) equipment fleets must give
very careful consideration not only to initial equipment selection but also the method of
acquisition, the monitoring of usage and performance, training of plant operators and the
maintenance of their fleet. A holistic range of skills and knowledge is required by the
competent plant manager.
Managers (not necessarily the plant itself) are the most valuable resource in most
businesses since they share the responsibility for off-highway plant and thus company
performance. However, the managerial resource can quickly depreciate in the absence of
sufficient and constant nurturing. It takes years of dedicated work to finely tune a
manager’s ability yet such can be depleted in a relatively short time span particularly if
the manager seeks alternative employment or fails to keep abreast of the latest
technology. An exact cost of enhancing the manager’s skills is difficult to estimate and
largely depends upon the nature and scale of the business. Nevertheless, the cost of under
Introduction 3
investment is considerable and will mean the difference between a successful and failed
business venture.
This section considers the options for equipment acquisition and supply and looks at the
organisational structure and business strategy needed to successfully manage the plant
holding. It covers external equipment hire and rental firms and the internal plant and
equipment department of an organisation operating in profit- or service-centre markets.
Finally, the section provides an overview of the most popular equipment types available.
This section deals with the economic criteria for evaluating investments in equipment,
including the effects of corporation tax, capital allowances and inflation. These economic
analyses are also applied to the various forms of ownership. A detailed procedure for
selecting the most suitable equipment for acquisition from a range of available
Management of off-highway plant and equipment 4
alternatives is described, and the calculation of an economic hire rate taking account of
ownership costs is given in a detailed example.
This section on operational management considers the more practical daily roles and
responsibilities of the plant manager. Legal and contractual insurance requirements,
especially hired plant and equipment, are dealt with, and licenses for plant operation on
the public roads are reviewed. The various strategies available for effective control of
equipment maintenance and its costs are also discussed. Health and safety requirements
and plant operator training and competency issues are summarised. The section concludes
with guidance on operational planning and international operational logistics.
This section deals with budgetary control and costing, cash flow and financial
management as applied to hire companies and equipment divisions. The use of
information technology in equipment management is also explained.
Part I
Organisation for business
Chapter 2
Organisation and management of
equipment services
Introduction
The means of obtaining equipment may be broadly classified as follows (refer to Figure
2.1):
1 own all equipment – including hire purchase, straight purchase and leasing;
2 hire in all equipment;
3 combine own and hire.
Each method will make special demands on the use of capital and resources.
The equipment service/hire business, like any other, survives by combining skills and
talents into an organisation that can produce services in sufficient quantity to satisfy the
material desires of the community in which it exists, and at the same time provide a
sufficient return on the capital invested. In practice many other objectives need fulfilment
including satisfying the desires of the shareholders, management and workforce to see the
enterprise grow and continually increase turnover, to become well known and respected
in its field, to operate in more stable markets and to keep up with competitors: these are
but a few aims. The ability to achieve such objectives is continually influenced by
business changes as indicated by pressure on profits, supply outpacing demand or vice
versa, competitors being more successful and through alterations in customer tastes and
requirements.
In order to operate within such a market framework the enterprise, or more correctly
its senior management, must establish clearly:
(1) The appropriate kind of business structure. For example, (a) only provide internal
plant services at rates of hire reasonably comparable with those available in the open
market; or (b) organise plant holdings as a separate entity responsible for generating its
own capital and profits, with the freedom to hire equipment both internally and to the
outside market.
(2) The type of services to be offered. For the provision of plant as a ‘service’
arrangement, management must decide how much capital should be invested in
equipment to service its own internal needs, thereby setting indirectly the limits on the
proportion that will be self-owned. The ‘profit-centre’ strategy requires plant to be
managed as an independent organisation, with a specific share of the market for
equipment hire established as a major goal. Critically for the latter, this involves taking
decisions on whether to concentrate on local, regional, national or international markets;
construction, mining/quarrying, agriculture, transport or industrial sector needs;
earthmoving, craneage, mobile, small general plant or specialist equipment, DIY
equipment; commercial maintenance services, etc.; as well as the corresponding location
and organisation of stockyards, rental outlets and service facilities. A strategy for
innovation, quality, delivering on time and developing good and continuing relations with
clients also has to be properly formulated.
(3) The desired share of the market. The potential market share needs to be based on a
careful evaluation of economic trends and opportunities, married to a detailed assessment
of the enterprise’s capabilities and likely potential for assembling the appropriate
commercial, managerial and technical skills, resources, etc.
(4) The appropriate skills and knowledge base required. Know-how in people is vital
in creating sales which increasingly rely on providing added value, developing efficient
and innovative equipment and services, effective processes and management systems.
Organisation and management of equipment services 9
(5) The possible changes in and fluctuations of the market in future years. Political
and economic shifts in consumer outlook, particularly concerning the environment and
quality, vary both between different markets and over time. Fluctuations will affect the
demand for plant and equipment, and management should always be looking ahead at the
potential consequences. There is likely to be more opportunity to adjust for a
commercially independent organisation which can set its own objectives and decide on
strategies, but even a small service plant department should maintain commercial
viability. Whether the plant holdings are organised into a ‘profit’ or ‘service’ centre, they
must be profitable.
By setting these major objectives, management is in a better position to structure the
organisation to meet the challenges.
Management structure
The appropriate management structure for a plant and equipment organisation will
depend upon the nature and size of the firm’s business activities. In particular, an
independent rental or hire firm will require all the management functions of a market-
oriented company, as shown in Figure 2.2. An internal plant division merely providing a
‘service’, will generally be integrated into the parent company’s activities, and functions
such as purchasing and financial accounting may be outside its responsibility.
For both types of business, the need to decentralise into geographical regions, or even
major equipment categories, is a further complication. Firms tend to make individual
depots or sites responsible for their own business activities when faced with this situation,
although responsibility for overall company policy, business development, major
purchasing and financial accounting may remain at head office (see Figure 2.3).
Board of directors
The bigger company is usually more decentralised and is managed through the board of
directors. The board is responsible to the shareholders for corporate management,
strategy and governance, with the managing director holding overall responsibility for
policy execution and usually chairing the company’s business. The board will commonly
have a varied membership with separate executive directors appointed to direct each of
the major functions, such as business development, administration, technical services,
accounts and workshop operations, depending on how the board decides to allocate
responsibilities. Such directors may or may not be shareholders according to their
financial ability to assemble a major portfolio of shares.
A very small minority of organisations, through acquisition activity, have been able to
develop a complex group holding of companies with the main board of directors
comprising executives empowered as managing directors to oversee the performance of a
subsidiary or major component of the company. Sometimes non-executive directors are
invited to serve on the main board offering specific expertise emanating from influence in
banking, politics, the legal profession or business development, with others perhaps
nominated by major shareholders to look after their interests, audits etc. Usually, a chief
executive officer is appointed to steer the group and chair the main board to the
satisfaction of the owners, that is, shareholders, but sometimes a separate chairperson is
nominated to preside over business affairs thereby containing excessive independent
action of the chief executive.
Organisation and management of equipment services 11
Administration
The administrative function will grow with the size of the business and in large firms is
subdivided into separate elements. The list of duties includes health and welfare of
personnel, employee training, provision of social facilities, a postal service, legal and
insurance advice, negotiation of wages and salaries, conditions of employment, personnel
record keeping and maintenance of the physical assets. Responsibilities commonly
extend to research and development, information technology management, quality
management and audits, and safety management, although some of these are becoming
sufficiently important to warrant separate control under a services function. Authority is
vested in a personnel/administration manager with subordinate managers responsible for
the different elements.
Financial accounting
The company accountant is responsible for the payment of invoices, receipts from hire
sales, control of cash and bank overdrafts, and preparation of the trading, profit and loss
accounts and balance sheet in accordance with the Companies Acts. The accountant has
an important function and often works closely with the managing director in controlling
the overall financial affairs of the enterprise. For example, in making decisions on the
type and source of capital for major purchases, assessing the financial viability of an
expansion programme and preparing the company financial budget for the year ahead.
Purchasing
The buying function is responsible for obtaining quotations for materials, supplies and
other consumables used at the depot and on plant and equipment located in the field but
maintained and supplied from the central or regional depot. Thus, advantages of
centralised purchasing may be realised from:
1 The ability to obtain discounts from bulk purchasing.
2 The efficiency generated by adopting standard procedures.
3 The ability to monitor the quality of supplies.
4 The experience gained from evaluating the commercial operations of suppliers and
subsequent development of preferred suppliers in a committed network.
5 Centralised administration facilities.
However, when the plant need is relatively small with items maintained on site, a
separate purchasing department is hardly necessary and consumables are simply charged
to the workshop maintenance account.
A secondary purchasing function may be participating in the purchase and sale of
equipment, especially inviting quotations and assessing the commercial details of a
transaction, although the advice of other departments will also be involved at this level of
plant procurement and disposal.
Management of off-highway plant and equipment 12
Cost accounting
The cost accountant collects and interprets data from other parts of the business and
prepares targets, in the form of budgets, against which costs and revenues may be
monitored. This information is used by departmental managers for control and updating
purposes. In particular, all the data required to prepare hire rates for equipment must be
recorded and returns are therefore required from all departments, including the hours
operated weekly for each item.
Transport
Most equipment is unsuitable for travel on public roads and must be transported from site
to site on trucks and lorries, co-ordinated by a transport supervisor through the workshop
and hire desk. The costs allocated include the running costs of the transport fleet, such as
fuel, maintenance, servicing, drivers’ wages, supervisors and administration staff salaries,
the capital cost of the transport fleet and overheads. The responsibility for servicing and
maintaining the transport fleet will generally remain with the transport manager, but
execution of the work may be undertaken by the workshop and subsequently charged to
the transport account.
of advice to customers on all aspects of the firm’s business from procurement to final
delivery. A well-founded department would incorporate a wide variety of the company’s
expertise acting coherently in a business development role, able to offer clients and
customers scope/ feasibility, operational, legal and contractual services and consultancy,
etc. The conventional ‘hire desk’ provides some of this function, principally the limited
aspect of selling.
Year Month
601 Terex 09/1984 100,000 20,000 5 DBAL 16,000 60,000 4,000 45.36 4,600 5,000 4,500 10.0 82 85 Bristol
TS14/
70
Management of off-highway plant and equipment 14
602 CAT 06/1984 120,000 20,000 5 DBAL 20,000 55,000 45,000 47.49 4,000 3,950 3,500 11.4 75 76 Birmin
633C gham
Scra
per
603 Terex 11/1985 118,000 18,000 5 DBAL 20,000 40,000 60,000 48.33 5,000 6,000 5,900 1.7 76 73 Wolver
TS14/ ham
75 pton
604 Terex 11/1985 118,000 18,000 5 DBAL 20,000 40,000 60,000 48.33 4,900 4,000 4,100 −2.5 70 67 Loughbor
IS14 ough
Within the above market framework there are many enterprises that have plant holdings,
some quite large, which are not subject to open competition, and it is important that the
capital invested be used efficiently. Notably, where the proportion tied up in equipment is
high, it is obligatory to try to maximise the profit on the investment; otherwise the capital
would be better used elsewhere in the business. Any other approach will carry serious
dangers. For example, if equipment is purchased to provide a service to other parts of the
business and charged below market rates, the resulting low bids must lead ultimately to
the other parts having to earn excessive profits to generate an acceptable rate of return on
the total capital employed.
Recent trends suggest that plant managed as a ‘profit centre’ is likely to perform better
than that organised as a ‘service centre’ as far as profitability is concerned. In the case of
the former, the rigours of the market place ensure that only equipment which can show a
high level of utilisation and/or profit throughout its working life is purchased. In addition,
the constraints are such that the costs of maintenance are controlled so that neither too
much nor too little is undertaken. For the ‘service centre’ however, operating costs are
ultimately met by the enterprise as a whole, and there is a tendency both for maintenance
facilities to expand and items to be purchased, with little regard to levels of utilisation.
Organisation and management of equipment services 15
employs a service system of internal plant hire (III), these being large general contractors
with sufficient work in their own organisation to keep utilisation at levels which are
economic and profitable for the firm. The rehire and low or no plant options (IV–VI) are
clearly favoured, especially for small businesses or those which predominantly rely on
the plant hire segment.
In addition to the above organisations, the DIY small tools and equipment sector is
today a major market, with several thousand shops and outlets supplying a wide range of
small items, from garden tools to small-scale industrial equipment.
Controlled plant
The plant fleet may ultimately become so extensive that, to maintain effective control, the
holdings are incorporated into a subsidiary division. The first priority may be to serve the
equipment needs of the parent business at a profit, but in order to maintain high levels of
plant utilisation and thereby maximise profits, items may be hired out to other users. As a
rule of thumb, the ratio between ‘hiring internally to the parent organisation’ and ‘hiring
externally to the market’ should not be less than 2:1.
However, the tendency with this system is for the equipment to be hired out to the
market when the rates are attractive, since there will be a demand for such services and
the required utilisation levels can be more easily achieved this way. Consequently, there
is a danger that the internal needs may be neglected, and items will not be available at the
right time for the organisation’s own uses. Furthermore, the servicing and maintenance
requirements of equipment hired internally may have to take second place to that required
on the open market.
Rehiring plant
In order to reduce the administrative duplication of each site (or contract), obtaining and
then invoicing for payment the plant requirements, some enterprises operate on a basis
similar to the low plant ownership arrangement, but provide a centralised service of
Organisation and management of equipment services 17
hiring-in all equipment and passing it on to the sites. The main advantage lies in the
ability of a centralised administration to negotiate favourable terms and discounts with
regular hire firms. Besides economy, some co-ordination of plant hire requirements
across the company can also be achieved and so accommodate the transfer of equipment
items from one location to another. An extension of this system is the recent emergence
of rehiring businesses supplying equipment to the hire sector itself.
No plant structure
Management sometimes takes the view that an unstructured organisation with respect to
plant holding will serve needs best. Several arrangements are possible. For example,
individual contracts may purchase equipment and be credited subsequently with nominal
resale values when the plant leaves the site. In this case care has to be exercised in
assessing equitable sums when purchases and resales are internal transactions. This
method is usually confined to special items, such as grouting pumps, cableways, etc.,
which are usually sold off when a contract has no further use for them. In conjunction
with this system, more general items may be moved from site to site without a formal
charging procedure. Plant is costed as an overhead to the contract on an arbitrary basis,
but these policies clearly carry the risk of not forcing the plant to make a sound financial
contribution to the company’s activities.
Chapter 3
Marketing and business development
The principal purpose of a plant organisation is to supply its equipment services to clients
at a profit. However, the market for plant varies dependent upon both the opportunities
for specialisation and the quality of service demanded. The organisation structure may
vary from the rental company operating in the open market to the ‘service’ plant division
typically found in a contractor or public sector department, and not least, to the many
owner–driver businesses. It is important that management properly define the business
aims and objectives, so that a suitable organisation may be assembled to operate in the
appropriate market segment(s). In this respect development of the business involves
establishing the customer’s plant requirements, so that the enterprise can organise itself in
the best possible way to satisfy those demands, commonly referred to as marketing.
Marketing is defined by the Institute of Marketing as:
The management function which organises and directs all those business
activities involved in assessing and converting customer purchasing
power into effective demand for a specific product or service, and in
moving the project or service to the final customer or user so as to achieve
the profit target or other objectives set by the company.
Importantly the marketing function extends beyond the actual selling function to fully
embrace the process of identifying and seeking out new opportunities and promoting
services, as well as taking responsibility for technical appraisals and supplying advice to
customers.
designated by government for special development and the private sector developers
investing heavily in new facilities.
FINANCE
Equipment requires heavy capital investment, which is usually principally provided from
internal private resources and retained profit, although hire purchase, leasing, bank loans,
etc. also need to be considered. Availability of loan capital in particular is likely to
fluctuate according to the fortunes of the national economy, with unpredictable changes
in the interest rate, when lenders may prefer other sectors of the economy. Furthermore, a
sound financial record of profitability, with mortgageable assets, is essential for
favourable consideration by the banking and financing sector. Before any item is
acquired, it should be remembered that a machine once purchased often cannot be turned
quickly into liquid cash assets to deal with a crisis.
ORGANISATION STRUCTURE
Most enterprises have a definable family tree which represents the official structure of the
management organisation. In practice, the actual lines of command and communication
are likely to be more subtle than those formally recognised. However, this family tree is a
good starting point in highlighting potentially weak structural arrangements.
MANAGEMENT DETAILS
The quality of present managers will be tested when entering new markets. Much
information is often held in personnel records on such matters as salary, qualifications,
education, training and experience. These data help to identify potentially strong
management areas and those which have failed to develop a healthy ladder of
achievement on which the younger employees can gain experience. If the process is
repeated for each operational element, gaps and stagnant areas become apparent.
ENGINEERING EXPERIENCE
Management and operational control surveys will yield useful information about the
nature of the business and its employees. Since plant services supply requires that good
managers should also be good engineers, any change in policy should spring from a
sound base of experience: it is far too risky to rely entirely on imported skills when
undergoing change. Therefore, a careful analysis is required of the existing skills to see
whether they will provide an adequate basis on which to build. In particular, staff
expertise is likely to be severely tested when policy changes involve the introduction of
new equipment lines or when the firm decides to decentralise and establish depots sited
away from headquarters.
PHYSICAL RESOURCES
Putting new objectives into practice may necessitate new depots, outlets and storage
facilities. However, the acquisition of land and the construction of new facilities take
time, are expensive and demand careful planning of the location. In addition, new and
Management of off-highway plant and equipment 22
different equipment items may require new maintenance facilities, which may be costly
and beyond the knowledge and experience of the management and workforce.
By comparing figures over the past five years with other organisations in similar fields,
some judgement is possible on the viability of the enterprise and its ability to take on new
ventures successfully.
TRADING ANALYSIS
The trading analysis means looking at individual equipment lines in a fair degree of
detail. The types of questions to be asked are:
1 What trends in profitability – say during the past five years – can be seen for the
various equipment types and lines?
2 How did actual profit compare with estimates?
3 How has inflation affected costs and what was the policy towards hire revenues?
4 What effect would changing the mark-up included in plant hire and equipment rental
rates have had on turnover and overall profits?
5 How did maintenance costs, actual machine life and utilisation levels compare with
estimates?
The stage of proposing any changes in company policy, as shown in Figure 3.1, has now
been reached. Once the facts are known, experienced senior managers will usually see
what changes need to be made. When these tentative proposals have been put forward, it
should be understood that new facts will emerge and errors in the forecasts will appear.
These are inevitably caused by political, environmental legislative and sociological
changes, shifts in the market outlook, technological developments and economic
Marketing and business development 23
influences. The effects of these movements are difficult to quantify, but should be kept
under cautious review, the policies being adjusted where necessary. However, care
should be taken not to overreact to new events, as this can cause loss of confidence at
middle management level.
Introduction
The range of off-highway plant and equipment presently available to the plant manager,
in terms of make, model and size, is considerable. This diversity can in part be attributed
to industry’s insatiable need for mechanisation. Over time, mechanical engineering
design has developed new innovative items to meet this increasing market demand.
Originally, plant engineering design concepts (c. 1900–1960) were largely mono
functional, that is, each plant item had its own ‘distinct’ application; either in the
agricultural or major earth moving sector of industry. Modern engineering design
concepts (c. 1960 onwards) have taken a more holistic view to engineering requirements,
and have subsequently pioneered multi-functional ‘utility’ machines. That is, machines
have evolved to be able to perform a variety of tasks in various industrial applications.
For example, the wheeled backhoe loader can be fitted with a wide range of machine
attachments (impact hammers, road sweeping brushes and so forth) which enable it to be
employed in different working environments.
To those who are not experienced in plant and equipment management, choosing the
equipment type for a given application can be a daunting task. There are many aspects to
consider, such as machine cost, productivity, adaptability and efficiency, all of which
ultimately influence business competitiveness and individual project profitability.
Choosing the wrong plant item can therefore be both inconvenient and costly. Selecting
the correct equipment for a given situation requires a combination of general knowledge
(of the equipment) and more specific, up-to-date information on, for example, machine
configurations and performance. The latter is difficult to achieve from any single
reference source, since new machines and models become available on an almost
continual basis. However, such information can be found relatively easily by contacting
plant manufacturers directly and requesting machine performance specification literature.
This is also the sensible approach because, in theory at least, one will obtain the latest
technical or performance data. Trade articles are also an important supplement to
manufacturer literature since comparisons between alternative machines’ performance
tend to be a regular feature.
This chapter presents an introduction to some of the more popular off-highway plant
items available. The aim of this introduction is to highlight the range and diversity of
plant available. A more detailed guidance on individual machines may be obtained in
Modern Construction and Ground Engineering Equipment (Harris, 1994).
Popular equipment types 25
The first ‘bulldozer’ was called a ‘crawler tractor’ and was manufactured in 1904,
resulting from the efforts of an American engineer named Benjamin Holt. Holt later
bought-out his
rival Daniel Best and the company Caterpillar was born. Early machines were mainly
used for agricultural purposes and in a physical sense tended to resemble steamrollers.
Whilst the bulldozer was originally developed for the agricultural industry, today’s
machine is firmly embedded within the earthmoving industry (more commonly known as
‘muck shifting’) and is designed to clear ground using a large vertical, curved blade
situated at the front of the machine. The modern machine is generally restricted in its
application to roadway/motorway grading, trenching and maintenance of haulage roads
but other industrial tasks include landfill, demolition, site clearance and logging (Figure
4.1). Bulldozers can also be used to tow other vehicles such as scrapers, lorries and
smaller plant items such as towed sheep’s foot compactor rollers. The number of
companies that manufacture bulldozers is limited due to the fact that the market is small
and the competition fierce, but the predominant manufacturers include Komatsu,
Caterpillar, Case, Liebherr and Fiat Hitachi.
Although both wheeled and tracked versions of the bulldozer are available, the tracked
type dozer is more common. The philosophy of the tracked plant item is that its tracks
Management of off-highway plant and equipment 26
run continuously along the ground, in segments, driven by high-level sprocket wheels.
The benefits of this are increased traction and, as a result of maximising the area of track
in contact with the ground, minimal force resulting from machine weight. That is why
tracked machines, despite their weight, can work in very poor ground conditions. A
hybrid variant to standard tracks is ‘swamp tracks’ which are extra wide tracks that allow
the machine to work on water-logged ground.
A range of blades and other attachments such as a rear-mounted ripper (for removing
stubborn objects or to rip rock into small pieces) can be fitted to bulldozers. Other
features may include the optional use of a laser mast so that the machine’s doze level can
be precisely controlled.
When purchasing (or hiring) a bulldozer, several key performance characteristics
should be assessed and compared in order to select the most suitable machine for the
given task. These characteristics include:
(1) Blades and attachments. It is important to ensure that the correct blade has been
selected. A multipurpose or universal blade offers the greatest flexibility, but specialist
tasks may require the use of angle, cushion or straight blades.
(2) Drawbar pull, engine output and operating weight. These specifications provide
information regarding the machine size and strength. A machine that is too large inhibits
manoeuvrability, whilst conversely, a machine that is too small can cost the organisation
in terms of reduced productivity and efficiency. The performance specifications of
bulldozers range from a drawbar pull of 10,000–215,000kg, an operating weight of 6.17–
132.00 tonnes and an engine output of 50–784KW.
(3) Undercarriage configuration. This broadly relates to the transmission, tracks and
sprockets. Most companies offer three main undercarriage configurations, namely (a)
general purpose for ‘normal’ environmental conditions (i.e. for working on a range of
surfaces from soft ground to rock); (b) reduced ground pressure such as the ‘swamp
track’ design where the machine’s load is distributed over a greater surface area; and (c)
long where a high quality of grading performance is required.
Tracked loaders
The tracked loader is related to the bulldozer but is fitted with a bucket clamshell. The
clamshell design opens at the bottom to allow ease of discharge into awaiting dump
trucks or other haulage vehicles; it also enables the bucket to grip objects (e.g. tree
stumps). Therefore, the tracked loader can dig as well as doze, lift heavy objects, load
haulage vehicles and other reciprocals and transport substances and articles around site
(Figure 4.2). The mechanics of loading dump trucks is similar to loading with a face
shovel tracked 360° excavator since both machines utilise a bucket clamshell.
Excavators
The first excavator was a steam powered shovel manufactured by Otis in the USA, during
1835. Approximately 40 years later, Ruston, Poctor and Burton manufactured the first
English steam powered shovel. However, the modern form of hydraulic excavator was
conceived during the 1940s following the mechanical engineering revolution inspired by
the Bruneri brothers in Italy. Since this latter date excavators have become one of the
most versatile and prolific of all plant items. The diversity of this range of machines is
vast; they can vary from a 1 tonne ‘mini-excavator’ to a huge 12,244 tonnes dragline
excavator! Similarly, the applications of these machines vary considerably and include
foundation excavation, mineral mining, truck loading, utilities and so forth. There are
numerous manufacturers of excavators including Caterpillar, JCB, Komatsu, Volvo,
Liebherr and Hitachi.
All variants of excavator are operated using joystick controls or levers to manoeuvre
the machine arm and slew the machine, whilst foot pedals are used to track the whole
machine backwards and forwards. The machine excavation arm forms a skeletal frame
and consists of three interconnected parts. These are the boom, the stick (otherwise
known as the dipper) and the attachment (normally a bucket). The three parts are
connected by bushes and pins ( joints) and powered by hydraulic rams (boom, dipper and
bucket rams), or steel ropes, that act as the machine’s ‘muscles’. The machine arm,
operator cab and engine and hydraulic compartments are mounted on a slew ring that
provides 360° slewing (or swing) capability. This feature ensures that the machine can
operate ‘unhindered’in relatively confined spaces.
Since there is such a wide choice available, careful consideration should be given to
the following when purchasing (or hiring) an excavator:
1 range and availability of attachments (e.g. impact hammers, cutting shears, concrete
crushers and so forth);
2 machine cycle times (since these will influence production rates);
3 protective features (audible alarms, falling object protection, convex mirrors, rear view
cameras, etc.);
4 engine output and operating weight as indicators of strength and power;
5 running costs to include both fuels and consumables;
6 physical site constraints (e.g. a large machine operating on a small site would improve
productivity but it may also increase the probability of accidents occurring).
Management of off-highway plant and equipment 28
Excavators are manufactured in three core classifications namely, tracked, wheeled and
mini-excavator. These three classifications are now looked at in greater detail.
Tracked excavators
At the heavy end of the spectrum, the ‘three phase’ electric powered rope excavators still
predominate but these are restricted to the largest of opencast excavations in Africa and
America. In the mid range, the tracked ‘diesel powered’ hydraulic excavator is perhaps
the most popular and can be seen in use throughout the industrialised economy. This is
mainly as a result of the machine’s versatility. Similar to the bulldozer, the track type
undercarriage allows the excavator to operate in adverse ground conditions. Within this
mid range, two broad configurations exist, namely, the face shovel and the backacter.
Face shovel
The face shovel, as its name suggests, pushes material away from the machine using a
clamshell bucket. Thus, the open bucket faces the material being excavated (refer to
Figure 4.3). To operate the face shovel efficiently, a flat, well prepared and compacted
substrata is required. This face shovel configuration is particularly suited to operating at
the bottom of opencast mines since the bucket literally peels a layer of the material from
the bottom of the material pile to the top, in an upward ‘cutting’ motion. These machines
typically weigh between 65 and 800 tonnes, although more specialist ‘coal shovels’ range
between 15 and 25 tonnes.
Backacter
Conversely, the backacter machine pulls excavated material ‘into’ the machine (refer to
Figure 4.4). To operate this machine efficiently requires an analysis of the work
environment
Popular equipment types 29
to determine any operational constraints that may influence machine performance. For
trenches and site clearance operations, the machine should ideally work on a level
surface. For production ‘earthmoving’operations, the machine would work on a
‘bench’which effectively raises the height of the machine above the dump target in order
to reduce cycle time.
Three common variants of the backacter hydraulic machine are the long reach, zero
tail swing and demolition variants.
(1) Long reach variants can be used to clean ditches and rivers. In the latter case, the
slewing ring, cab and arm are fitted to specialist barges (tracks and undercarriage are
redundant). These then allow the machine to travel water lanes and canals with ease. The
only disadvantage with this variant is that an increase in machine arm length normally
translates into a reduction in maximum bucket load capability.
(2) The zero tail swing option allows the rear of the machine to swing within the
confines of its track width, and thus reduces the likelihood of contact with pedestrians or
other potential obstructions to the rear of the machine (Figure 4.5). This type of machine
has one of the better health and safety design features available, particularly where
machines operate in confined spaces.
(3) Demolition machines are fitted with falling object protective structures (FOPS).
They are often reinforced with wear plates to protect the undercarriage from damage due
to demolition debris and a tailgate wear plate to protect the rear structure of the machine
from
impact damage (e.g. through contact with debris material such as concrete) when
slewing. The tailgate wear plate may also act as a heavy counterweight to balance the
machine when lifting heavy loads. In addition to these safety features, demolition
machines can also be fitted with a wide range of attachments such as concrete crushers
(Figure 4.6), steel shears and grabs of various types. These attachments allow the
machine to efficiently dismantle a wide variety of structures. The demolition option may
include a long reach configuration (Figure 4.7).
Popular equipment types 33
Protective features, such as FOPS and wear plates, can also be fitted to machines
operating in other arduous operational conditions, for example, within mining and
quarrying or wherever a danger from falling objects exist.
Wheeled excavators
Wheeled excavators are predominantly backacter machines and are more fondly referred
to as ‘rubber ducks’ because of the nodding action of the boom as they travel. They are
similar to operate as their tracked counterparts but include rubber tyres instead of tracks,
hence their name (refer to Figure 4.8). Tyres enable the machine to travel on surfaces that
would perish under the stress of steel tracks, for example, tarmacadam or other road
surfacing materials. The wheeled machine sometimes includes a dozer blade that is
incorporated into the design and can be used to grade substrata material, push excavated
material back into trenches, and act as a stabilizer when excavating.
A variant of the wheeled machine can be found in the rail industry and is named the
road railer (Figure 4.9). These machines are simply fitted with rail wheels (in addition to
tyres) thereby enabling them to travel unrestricted distances along the rail network. In
such circumstances, these machines are typically used to perform track and embankment
repair and maintenance works.
Management of off-highway plant and equipment 34
Mini-excavators
Richard Smalley (Lincolnshire, England) is widely acknowledged as the genius behind
the development of the 360° mini-excavator (c. early 1960s). Initial mini-excavator
models were
manufactured on ‘stilts’ and they moved forward by ‘dragging’ themselves along, that is,
the backacter machine arm was stretched out, lowered to the ground and used to pull the
mini-excavator forward. This original design is still used today as a purpose-built
gravedigger. This particular type of machine also incorporates telescopic stabilisers that
help prevent machine turnover during excavation. Later models were manufactured on
wheels for use on tarmacadam road and other hard surfaces. Japanese manufacturers then
further developed the mini-excavator by including tracks and a slew drive, with these
tracks being constructed from either steel or hard-wearing rubber. Rubber tracks are a
good compromise since they enable the machine to work both on and off highways (and
other softer surface materials) (Figure 4.10). Akin to the wheeled excavator the mini-
excavator can also include a dozer blade.
Applications of the mini-excavator include small domestic and industrial construction
work (trench excavation, site strip and so forth), other work where space is at a premium
(i.e. where a mid range ‘12–30 tonne’ excavator would not fit), landscaping and utility
services (e.g. gas and water). A combination of low capital/running costs, high
production and compact design has ensured that the mini-excavator has replaced manual
excavation and traditional materials handling methods for most small projects. World
sales are dominated by Komatsu and Hitachi, although JCB, Kubota, Volvo, Hanix,
Management of off-highway plant and equipment 36
Bobcat and Case also manufacturer ‘minis’. In 1980, UK mini-excavator sales were a
mere 200 whilst in 1998 over 4,000 were sold. This almost exponential growth in sales
clearly demonstrates the mini-excavator’s increasing utilisation within UK construction.
Compactor rollers
The road, rail, construction, mining and waste industries all heavily rely upon the use and
reuse of excavated substrata and aggregates to backfill trenches and foundations.
However, following excavation, such materials are bulked by voids of air that leave them
susceptible to settlement and distortion after placement. To reduce the likelihood of this
type of failure, the substrata density must be artificially increased by compaction
methods, to increase substrata strength and reduce its compressibility. The amount of
achievable compaction depends upon the soil’s chemical and physical properties and the
compaction forces exerted upon it. The variance in soil types and desired compaction
values have inevitably led to the manufacture of various types of compacting equipment.
The traditional means of compacting ground was achieved through the use of a towed
roller attached to a crawler loader, tractor or bulldozer. Although the towed roller is still
used, a range of specialist compactors is now available; these are the drum roller, sheep’s
foot roller, vibrating roller and deadweight roller. Manufacturers of compactor rollers
include Caterpillar, Komatsu and Bomag.
machine is designed to compact stone and other aggregates to form a suitable bed for
bituminous materials and is much larger and heavier than its single and double drum
counterparts.
Once the sub-base has been sufficiently prepared, coarse and finish surface coats are then
laid and compacted using the deadweight roller (Figure 4.14). The wheel base
configuration for this machine consists of two slim rear rollers and one wide front roller
that overlaps the rear rollers to ensure that ridges in the top coat are not created. Water is
sprinkled onto the rollers during use to ensure that the asphalt or tarmacadam does not
Popular equipment types 39
stick to them. Some machines also include a cutting wheel that maintains a straight edge
ready for an adjacent bituminous strip to be laid (if required).
(e.g. the self propelled vibrating roller) and its pneumatic tyres ensure that the chippings
are not crushed to dust.
Other types of compaction equipment include vibrating compactor plates (Figure 4.15)
and vibration tampers for smaller projects (such as service and domestic foundation
trenches) (Figure 4.16). The compactor plate is sometimes referred to as a ‘whacker
plate’ after the manufacturer in the same way that vacuum cleaners are incorrectly called
Hoovers! In addition to compacting foundation and services base material, the steel plate
can also be covered with a purpose designed rubber mat, carpet or hessian and used to
compact block paved areas. The inclusion of a tough material cover over the steel
compactor plate ensures a reduction in pattern marking on the blocks that occurs as a
result of grit or stone becoming trapped between the steel plate and the blocks.
The wheeled backhoe loader is one of the most popular of off-highway plant and
equipment items available for the owner operator. The machine combines the features of
the wheeled loader (bucket clamshell) and excavator (backacter machine arm with up to
180° slew capability) and because of this, it has great versatility and manoeuvrability
both on and off highways. For many smaller businesses, the wheeled backhoe loader is
the first and often only machine purchased.
Management of off-highway plant and equipment 42
Within the UK, this particular machine is synonymous with JCB although the exact
origin of the first backhoe loader is vehemently contended amongst plant manufacturers
(namely, Case and JCB). However, the referral to a ‘JCB’ as opposed to a specific model
of machine provides strong evidence of JCB’s prominence within the plant and
equipment industry. In 1953, Mr Joseph Ceril Bamford amalgamated the design
principles of a lightweight backhoe manufactured by Eik Hauskins Co., a Ford Major
Tractor and the wheeled loader face shovel. This new ‘revolutionary’ machine, called the
MK1, was sold to the agriculture, civil engineering and construction industries
commencing in 1954. Since then, the broad shape and functionality of the machine has
hardly changed. Engineering alterations have been made but these have tended to focus
upon improvements to operational performance, efficiency, power and operator comfort.
This machine’s basic design configuration has provided great advantages over
mechanical rivals (Ober, 1999). Essentially, the machine anatomy consists of four key
components, which are:
1 a four wheel drive to enable good manoeuvrability in even the most arduous of
environments;
2 a face shovel to carry aggregates or crops, or to strip, for example, top soil;
3 a backacter to excavate trenches, move spoil, grade embankments or dredge
rivers/pools;
4 stabilisers to ensure minimal machine movement whilst the backacter is being utilised
(Figure 4.17).
Both the face shovel and backacter can be fitted with a variety of tools, for example,
impact hammers for breaking hard surfaces, road sweeping brushes for agriculture and so
forth.
Popular equipment types 43
World market leaders of this product today include JCB, Case and Caterpillar. However,
sales of the machine have declined as a result of the development of other complementary
machines, namely the mini-excavator and the telehandler. To combat this decline,
mechanical design engineers have developed hybrid 360° wheeled backhoe loaders that
are smaller and more versatile. This development integrates the skid steer loader, 360°
mini-excavator, and backhoe loader into one machine.
The packaging of materials and prefabrication of components has stimulated the need
for greater transportation of these goods. To satisfy this need, two types of forklift truck
have evolved and now predominate in construction and agriculture. These are the rough
terrain telescopic handler (often shortened to telehandler) and the rough terrain fork lift
(masked) truck.
3 loading from delivery vehicles direct to the point of usage, which reduces the need for
storage space on site; a much valued commodity;
4 stacking materials in stockpiles in order to maximise available storage space.
The telescopic handler may also use a rough terrain four-wheeled ‘power train’ drive
design, making it ideal for agricultural as well as construction use. Hence, 40 per cent of
total sales of this type of machine are within the agricultural industry.
Within the UK, the Giraffe, manufactured by Liner, was probably the first formal
telescopic handler, although this particular manufacturer has recently ceased trading.
Currently, the main manufacturers supplying UK industry are JCB, Manitou and Merlo.
JCB and Manitou are currently world leaders in telescopic handlers, as measured by the
number of items sold. Sales figures for the UK construction industry are currently
estimated to be around 4,000–5,000 machines, a growth from fewer than 200 when
records of machine sales were first recorded in 1980. This rapid growth in machine sales
provides evidence of the machine’s success within UK construction.
Dump trucks
For earthmoving, civil engineering and mining activities, the transportation of rock, earth
and assorted minerals is an essential task. Dump trucks represent the most widely utilised
means by which to haul material over a given distance. They range from the small
construction
Popular equipment types 47
site dumper, to the huge ‘rigid’ haulers found in the mining industry. Dump trucks are
more efficient than any other off-highway plant at hauling material over long distances.
However, these machines are reliant upon excavators or wheeled loaders to load them.
Current manufacturers of site dumpers include Barford, Benford, Thwaites, Ausa and
Lifton. Payload capacities typically range from 0.50 to 6.00 tonnes with body capacities
of 0.18–3.2m3. Travel speeds vary between 4.3 and 32km/h.
features enable the front and rear of the machine to move independently of each other in
two planes, thus reducing stresses induced onto the structural frame when transporting
material over undulating ground conditions. A rear-tipping action is used to deposit
material collected.
In many instances, scrapers have been replaced by ADTs, principally because ADTs
have similar productivities but are more economical to operate, even though they need
other machines to load them. Current manufacturers of ADTs include Aveling Barford,
JCB, Caterpillar, Komatsu, Terex, Bell, O&K, Moxy, Volvo and Thwaites. Payload
capacities typically range from 8.5 to 37 tonnes and heaped capacities from 4.8 to
22.5m3. Travel speed ranges from 25 to 56km/h.
crack, thereby incurring further expenditure and/or causing accidents. Standard practice
therefore
includes the application of other plant such as bulldozers and compactors to ensure that
haul roads are suitable for rigid dumper use.
Manufacturers who presently include rigid dump trucks in their product line are:
Liebherr, Case, Terex, Aveling Barford, Euclid Hitachi, Caterpillar and Komatsu.
Payload capacities typically range from 10.5 to 350 tonnes with heaped capacities of 5–
183m3. Travel speed in forward varies considerably between 32 and 68km/h.
Cranes
powered machines proved invaluable to the then mighty British Empire Naval Fleet who
used cranes for stocking ships with materials and resources (ibid.).
In the modern era, two broad classifications of crane have evolved and now
predominate, namely tower cranes and mobile hydraulic cranes. There are also some
‘hybrid’ varieties of crane such as the mobile tower crane.
Tower cranes
For high-rise construction and civil engineering works, tower cranes are a vital resource.
Although there are various categories of tower crane available, the horizontal, luffing and
articulated jib varieties are most common. Each variety is designed to resist overturning
when lifting and torsion from side loads acting on the boom, for example, wind loads.
Horizontal jib
The horizontal jib is fixed, constructed using a lattice structure and is divided into two
sections. Both sections are mounted on a vertical standing mast that is firmly anchored to
the ground via a sturdy concrete foundation and hold down bolts. For the first section,
reinforced steel cables extend from a winch to the jib trolley and hook block. The hook
block is attached to the jib to allow loads to move across the length of it. The second
section is much shorter and incorporates a counterweight to stabilise the crane when
lifting loads. To manoeuvre a given load (right or left and through 360°), a slewing ring
is located at the intersection between the top of the tower and the jib. The operator’s cab
is often located on top of the slew ring such that a good, clear view of the load and
ground is achieved (Figure 4.24). A requirement of the horizontal jib crane is that there is
an unrestricted horizontal clearance; this enables the crane to bring loads close into the
vertical mast ready for unloading.
Other configurations
There are various other types of tower crane configuration available and these include:
1 Rail mounted crane (otherwise known as the travelling crane): This type of crane is
mounted on tracks and is particularly useful on sites where increased load distribution
capabilities are required.
2 Tied-in tower crane: For structures above 100m high, a tower crane tied-in to the
structure, at intervals recommended by the manufacturer, is used. By tying into the
structure, greater resistance to overturning and torsion is provided whilst
simultaneously ensuring that greater heights are reached.
3 Climbing crane: On sites where external space is limited (e.g. in city centres where sky
scrapers predominate), the climbing crane is used. The position of the crane is located
on the inside of the structure and is secured to key structural components. As each
Popular equipment types 53
consecutive floor of the structure is completed the crane sheds its fixed base and
climbs to the next floor using either winches or hydraulic jacks.
Mobile cranes
The mobile hydraulic group of cranes includes crawler, all terrain, truck mounted, rough
terrain and city cranes. The mobility of this group gives them a great advantage over
tower cranes, particularly where lifting activities are spread over a wide geographical
area. Inclusion of tyres means that the city, truck mounted, rough terrain and all terrain
cranes can travel on the highways between various locations (Figure 4.25). The all terrain
and rough terrain cranes (as their name indicates) can also travel off-highway thus
enabling penetration into remote locations. Load capacities vary but tend to range
between 30 and 800 tonnes, although the Riga AMK 1000 telescopic crane has a 1,000
tonne lift capacity.
Popular equipment types 55
For special lifting operations, lattice booms fitted to crawler tracks have been
developed (Figure 4.26). This combination of simple but effective design allows the
machine to operate on poor ground whilst simultaneously lifting heavier loads (usually
between 250 and 1,200 tonnes). The world’s biggest mobile ‘tracked’ crane was built by
Demag and can lift 2,000 tonnes. Crawler cranes also offer good mobility but must be to
some extent dismantled and transported on low loader trailers between projects.
Additional costs are therefore incurred in terms of time and other resources needed to
erect the crane, along with transportation costs. Manufacturers of these machines include
Tadano-Faun, Kato, Liebherr and Grove. Lift capacities range from 3 to 1,600 tonnes.
Wheel loaders and tool carriers are relatively new machines when compared to other,
more familiar off-highway plant and equipment (Figure 4.27). The original machine was
conceived in the agricultural industry during the 1920s when tractors were fitted with a
loading shovel. However, the first self-contained, two wheel drive, rubber-tyre wheeled
loader was introduced by Frank G. Hough Co. much later in 1939. Early engineering
designs aimed to produce a face shovel bucket attachment to a machine that could re-
handle light agricultural materials. Such attachments are still available today. However,
Management of off-highway plant and equipment 56
in later years the ‘front-end’ machine became far sturdier and suitable for carrying
heavier payloads; it also had higher breakout forces.
This front-end machine predominates today in the aggregates industry and is used
widely in construction and mining. It is designed specifically as a digging and loading
machine, although, some of the larger machines have quite recently been adapted to serve
as rock shovels in the mining sector.
There are many wheeled loader manufacturers worldwide but the prominent
manufacturers include Komatsu, Volvo, Caterpillar, JCB, Liebherr, Fiat-Hitachi, O&K,
Case and New Holland. Machines are either rigid or articulated but the majority are
articulated. Key machine specification variables include shovel capacity (0.08–20m3),
max speed (7–35.2km/h), breakout force (between 7 and 274kN) and operating weight
(0.65–205.20 tonnes).
The skid steer loader (also known as the compact utility machine) is a four-wheel drive
vehicle with rigid axles. It manoeuvres by powering the wheels (or tracks) on one side of
the machine whilst applying brakes to the other. This independent movement of the
wheels on one side allows it to rotate through 360° within its length similar to a military
combat tank. Typical machines (such as the Caterpillar models) have no transmission.
Instead, they are powered by the use of hydraulic pumps and motors (one motor for each
side of the machine). Each motor connects to a sprocket that is linked by two chains to
each wheel. The sprockets
and chains thus distribute the power from the hydraulic motor and increase the torque at
the wheels by providing a gear reduction. Up to four hydraulic pumps are used; two for
drive power, one for lift/work ‘attachment’ tool power and one for circulating hydraulic
oil through filters to provide pressure for pilot controls. This innovative engineering
design ensures that the machine does not stall during utilisation (Figure 4.28).
The first ‘true’ skid steer loader was probably developed by Bobcat (nee Melroe
Manufacturing Company) in 1960. This machine, named the M-400 was initially
developed for the agriculture industry, but soon revolutionised the wider compact
materials handling sector. The name ‘Bobcat’ was reputedly used in honour of the prairie
animal whose ‘tough, quick and agile’ attributes resemble those of the machine. New
Holland’s engineering designer, Larry Halls, also designed a competitor called the Super
Boom (affectionately called the Flintstone buggy) in 1960.
When first developed, general industry was not quick to grasp the inherent
functionality of these robust, compact and highly adaptable machines, so sales of the skid
steer loader failed to grow until the early 1980s. Since then, the machine has become an
essential item for any company engaged in materials handling activities. Principally, this
reliance is due to the considerable range of attachments available; up to 40 individual
work tools at present with future development potential. Some of these items include
augers, material handling forks, trenchers, demolition tools, buckets, snowblowers and so
forth. This diversity of attachments gives the machine unrivalled switching capability
such that a number of tasks can be completed by one single item. In turn, the future of
skid steer loaders in wider industry has been secured, for example, in agriculture,
construction, civil engineering, shipping and demolition. Because of the diversity of
operational requirements, the machine specifications also vary considerably with
operational weight varying between 0.53 and 4.5 tonnes.
Part II
Investment, procurement and
business management
Chapter 5
Economic comparisons of equipment
alternatives
The basic approach to economic comparisons is to assemble all the costs relating to one
course of action and all the costs relating to the alternative course of action and to
compare them. The assembling of the costs must be in such a way that the two are
comparable. It is the difficulty of ensuring that the assembled ‘packages’of costs are
comparable that requires the calculation of either present worth, or value, of two
proposals or the equivalent annual cost of the two proposals. Of these techniques of
comparison, present worth is more commonly used. Both present worth and equivalent
annual costs require an interest rate which is taken to represent the value of money to the
investor. That is, it represents the interest the investor could receive elsewhere.
Comparisons not involving interest rates are very common in short-term schemes –
that is, schemes of less than one year. Company staff are continually and almost
subconsciously undertaking economic comparisons without interest in the calculations.
Such economic comparisons include comparing the hire rate for different cranes, or the
hire rate for different excavators, or the hire rate for an excavator from an external
equipment hire company with the hire rate from the enterprise’s own equipment division.
Comparing the cost of, say, hand excavation with the cost of using an excavator is
another economic comparison. All these comparisons refer to operations with relatively
short time periods of a few weeks or a few months and the effect of interest is not
significant. Thus, the comparisons are valid and easy to make on an equitable basis. The
comparisons become more difficult when the operations or schemes to be compared last a
few years or more, when the effect of interest becomes significant and needs to be
included in the calculation. The difficulty is assembling the various costs into ‘packages’
that can be compared for these longer-duration operations that require ‘present worth’ or
‘equivalent annual costs’. Some examples of longer-duration operations or schemes are
equipment required for quarrying, open-cast mining or concrete production.
All the examples in this section are based on cash flows that have been estimated at
present or year zero prices without taking inflation into account. The interest and time
relationships used in this chapter are explained in the Appendix, which includes examples
of interest tables for interest rates of 10 and 15 per cent.
Economic comparisons of equipment alternatives 61
Present worth
Present worth comparisons are used to compare two or more schemes where the
equipment chosen for each scheme leads to different capital investment and different
running costs. Essentially, present worth enables the trade-off between capital investment
and future running costs to be compared. Example 5.1, which includes the capital cost of
buying equipment and the running costs of operating the equipment, illustrates the
comparison. All the estimates used in this comparison are at present-day (i.e. year zero)
prices.
Example 5.1
The capital sums are already in year zero and need no further manipulation. The running
costs of £1,500 and £1,750 each year need to be converted to present worth or capital
sums. The factor used for this conversion is the uniform series present worth factor. This
factor, 3.352, has been taken from the tables in the Appendix.
The present worth of Proposal 1 is £14,366 and the present worth of Proposal 2 is
£14,528. Thus, Proposal 1 is the more economic. The present worth of Proposal 1,
£14,366, represents enough money to buy the equipment item at a cost of £8,500 and
investing the remainder at 15 per cent is enough to produce £1,750 each year for the next
five years. Thus £14,366 is the amount required now to meet all the requirements of
Proposal 1. Similarly, the present worth of Proposal 2, £14,528, is the amount required
now to meet all the requirements of Proposal 2. Since the present worth of Proposal 1 is
the smaller and both proposals would be compared only if the two items of equipment
Management of off-highway plant and equipment 62
were capable of doing the same tasks, then the one with the least cost, that is, least
present worth, is the most economic.
An alternative way of considering this comparison is to examine the differences
between the capital costs and the running costs. Proposal 1 has £1,000 less capital but
requires £250 more running costs each year. Thus, the extra capital of £1,000 involved in
Proposal 2 can be seen to be buying £250 of savings in the running costs. The question as
to which of the two schemes is the more economic could be restated as follows: would
the £1,000 of extra investment be better used in saving £250 in running costs or earning
15 per cent if invested elsewhere? £1,000 invested at 15 per cent for five years would
give an income of £298.31, calculated as £1,000×0.29831=£298.31; where 0.29831 is the
capital recovery factor, taken from the tables in the appendix. Thus, the return on the
investment is better than the saving in the running costs. Therefore, Proposal 1, the
smaller of the capital investments, is the more economic proposal.
This present worth comparison is valid so long as the lives of the two proposals are the
same. This is usually the case in comparing equipment items. One exception is
comparing the cost of keeping an item of equipment for one year with that of keeping it
for two, three or four years. In such cases the lives are different and require different
treatment. This is explained later, in the section dealing with replacement.
The example presented is the use of present worth in a simple case where there are
only capital and running costs and where the running costs were uniform – that is, the
same each year. The principles of using present worth are the same even when the cash
flow becomes more complicated. The next example shows the running costs varying each
year in order to reflect the increasing costs incurred as the equipment grows older. Also
included in the next example is a resale value of £4,000 occurring in the last year. The
resale value is a return of money to the investor and therefore carries a different sign from
the capital and running costs, which are outflows of money. Again all the cash flows are
estimated at present prices.
Example 5.2
The present worth of these cash flows is £13,247.72, calculated as shown in Table 5.1 at
an interest rate of 15 per cent. This present worth can now be compared with the present
worth for an alternative proposal.
Economic comparisons of equipment alternatives 63
The present worth factors are taken from the tables in the Appendix. Because the annual
sums are varying in this case, the uniform series present worth factor cannot be used and
the individual present worth factor for a lump sum, 1/(1+i)n, is used instead, where i is the
interest rate and n is the number of years. This increases the arithmetic involved but is
unavoidable when dealing with varying annual cash flows.
The treatment of the £4,000 resale value shown here is to simply add it into the present
worth, taking account of the different sign. It may be more acceptable to deduct its
present worth for the initial capital:
Initial capital invested =£8,500.00
Present worth of resale =£4,000×0.49717 =£1,988.68
Adjusted capital invested =£6,511.32
The total present worth calculated after adjusting the capital invested in this way to take
account of the resale value will be the same as the example given.
Example 5.3
The equivalent annual cost of Proposal 1 is £4,285.64 and the equivalent annual cost of
Proposal 2 is £4,333.95. The calculations are as follows:
Equivalent annual cost of Proposal 1 =£1,750+(£8,500×0.29831)
=£1,750+£2,535.64
=£4,285.64
Equivalent annual cost of Proposal 2 =£1,500+(£9,500×0.29831)
=£1,500+£2,833.95
=£4,333.95
The annual running costs of £1,750 and £1,500 do not need further manipulation. The
capital costs of £8,500 and £9,500 need to be converted to annual costs. The factor used
for this conversion is the capital recovery factor, 0.29831, and has been taken from the
tables in the Appendix.
The equivalent annual cost (EAC) of Proposal 1 is £4,285.64 and the EAC of Proposal
2 is £4,333.95. Thus, Proposal 1 is the more economic, as was found by the present worth
comparison. The EAC represents the annual cost of owning and operating the item of
equipment. This is made up of £1,750, representing the annual running cost, and
£2,535.64, representing the annual cost of the capital investment. This is calculated on
the basis that if £8,500 were invested at an interest rate of 15 per cent, an income of
£2,535.64 could be taken each year for the next five years. This income would be made
up of the interest earned plus the original capital. At the end of the first year £1,275 of
interest would be earned on the £8,500 of capital invested. Thus, if an income of
£2,535.64 were taken, this would be made up of £1,275 of interest plus £1,260.64 of
capital, leaving £7,239.36 of capital. At the end of the second year the £7,239.36 of
capital would earn £1,085.90 of interest. The income of £2,535.64 would be made up of
the £1,085.90 of interest plus £1,449.74 of capital, leaving £5,789.62. The interest earned
in the third year would be £868.44 and the income of £2,535.64 would be made up of the
£868.44 of interest plus £1,667.19 of capital, leaving £4,122.43 capital. In the fourth year
the interest earned would be £618.36 and the income of £2,535.64 would be made up of
the £618.36 interest plus £1,917.27 of capital, leaving £2,205.16. In the fifth year the
interest earned would be £330.77 and the income would be made up of the £330.77
interest plus £2,204.86 capital, leaving the account exhausted and no capital (on the basis
of the calculations presented here, £0.30 of capital would remain but this is due simply to
rounding errors in the calculation). Thus, if the £8,500 were invested at 15 per cent, an
income of £2,535.64 could be taken each year for five years. However, since the £8,500
was not invested in such an account but used to purchase the item of equipment, the
Economic comparisons of equipment alternatives 65
investor is deprived of the income of £2,535.645 and therefore this can be regarded as
equivalent to the annual cost of owning the equipment item.
This example shows the use of EAC where only capital and running costs are
considered and the running costs are uniform. The use of EACs becomes more difficult
when running costs vary from year to year. In such cases it is necessary to convert the
varying running costs to a capital cost before converting them back to an EAC. The next
example, using the same cash flows as Example 5.2, illustrates this difficulty. As in
Example 5.2, the cash flows are estimated by use of present prices.
Example 5.4
The present worth of the resale, that is, £1,988.68 and the purchase price less resale, that
is, the adjusted capital invested, is £6,511.32, as explained in Example 5.2.
The EAC of the capital invested is £1,942.39, calculated as follows, taking the capital
recovery factor for five years, 0.29831, from tables in the Appendix:
The present worth of the running costs are £6,736.40, summed from the calculations in
Example 5.2 and the EAC of the present worth of these running costs is £2,009.54,
calculated as follows, taking the capital recovery factor for five years, 0.29831, from
tables in the Appendix:
Thus, the total EAC for all the cash flows – the purchase price less resale value and
running costs – is £3,951.93. This is made up of £2,009.54, representing the running
costs, and £1,942.39, representing the purchase price less resale. Thus, the EAC of
£3,951.93 can be used for comparison with similarly calculated EACs for alternative
proposals.
By converting the varying annual running costs to a present worth and then converting
this present worth to an EAC, the running costs can be distributed uniformly over each
year. This procedure overcomes the difficulty with varying running costs. However, this
procedure also illustrates why the use of present worth as a basis for comparison is more
Management of off-highway plant and equipment 66
common. To arrive at an EAC, the cash flows had first to be converted to a present worth.
Therefore, it is easier to perform the comparison on the basis of present worth rather than
involve the extra calculation of producing EACs.
However, the EAC method does not require the levels of proposals under comparison
to be equal, as is required in a present worth comparison. The reason is that the sum
calculated, the EAC, refers to one year and the EAC of any alternative scheme also refers
to one year. The process of calculating EACs takes account of the duration of the
equipment item and produces annual costs which can be compared with annual costs for
other proposals. An example of this is comparing the cost of keeping an item of
equipment for one, two, three, four or five years, thereby determining the best
replacement age. The costs of keeping an item of equipment for different periods are, in
effect, different proposals which have different lives and therefore present difficulties in
comparison on the basis of present worth.
Another use of EACs is to convert the purchase price and running costs to annual costs
that can then be compared with the cost of hiring. The same device of converting the
capital costs to annual costs is one way of determining the capital element in a hire rate
when determining what the economic hire rate should be.
In the previous section all the examples were based on cash flows that were estimated at
present or year zero prices. The effect of inflation was not taken into account. In
Examples 5.2 and 5.4 the annual costs increased as a result of incurring increasing
running costs as the equipment grew older and not the effect of inflation. A simple
illustration of inflation is that, if in year zero a ‘basket of goods’ cost £100 and in year
one the same basket of goods cost £110, then inflation of 10 per cent has occurred. In
other words, inflation causes more money to be paid out for the same goods. As
individual items change price, or inflate, at different rates, the basket of goods concept is
used to create indicators of the average price movements or inflation. The most
commonly known ‘basket of goods’ is that used to calculate the retail price index.
The approach of estimating cash flows for purchase price, running costs and resale at
present or year zero figures and then including the adjustments for inflation is frequently
used, because it separates the difficulties of estimating the cash flows resulting from the
selection of the equipment item and its technical capabilities from the vagaries of
inflation. This separation also allows different inflation assumptions to be made and
evaluated without disturbing the underlying estimates.
The following methods explain the means by which the inflation assumptions can be
incorporated into economic comparisons. The explanations are based on the cash flows
for Examples 5.1 and 5.2.
was £14,528. The cash flows leading to these present worths were based on estimates at
year zero prices, the interest rate was taken at 15 per cent, and this comparison, which
excluded inflation, indicated that Proposal 1 was the most economic.
Inflation would increase the running costs of both proposals and so increase the
present worths. It should be remembered that the present worth is the sum of money
required to be invested now to generate the stated cash flows, given a certain interest rate.
Thus, if the cash flows are increased, the amount required for investment to generate the
cash flows must also increase, given that the interest rate remains the same.
If the purpose of the exercise is simply to compare the proposals and select the most
economic, and the inflation rate assumed is small, the comparison will not be affected
seriously by the inclusion of inflation. That is, if small inflation allowances are added into
both proposals, the difference between them will not be affected enough to change the
comparison. This may be sufficient for small inflation rates but is unlikely to be
satisfactory for larger inflation rates.
Example 5.5
The cash flows in Example 5.1 are listed in Table 5.2. These cash flows were all
estimated at year zero prices. Any cash flow not occurring in year zero would be subject
to inflation. If an inflation rate of 10 per cent per annum were assumed the cash flows
would be adjusted as shown in Table 5.3. The calculated cashflows are presented in Table
5.4. Now that the cash flows have been adjusted for inflation, the present worth of both
proposals can be calculated as before. Because the cash flows vary from year to year and
are not uniform, the present worth factors for each year will have to be used, as in
Example 5.2.
Table 5.2 Cash flows for Proposals 1 and 2 for
Example 5.5
Year Proposal 1 cash flow (£) Proposal 2 cash flow (£)
0 8,500 9,500
1 1,750 1,500
2 1,750 1,500
3 1,750 1,500
4 1,750 1,500
5 1,750 1,500
The present worths of both proposals are calculated as follows, using an interest rate of
15 per cent.
Proposal 1
The present worth for Proposal 1 is calculated as shown in Table 5.5. The present worth
factors were taken from the tables in the Appendix.
Proposal 2
The present worth for Proposal 2, similarly calculated, is £16,076.58. This comparison
reverses the choice indicated in Example 5.1 by indicating that at 10 per cent inflation
Proposal 2 becomes the more economic. Proposal 2, having the smaller running costs,
suffers less from inflation than Proposal 1. At smaller inflation rates the choice would
still be Proposal 1, as before. However, with an inflation rate at 10 per cent Proposal 2
becomes the more economic. Originally, the present worth of £14,366 for Proposal 1 was
sufficient to provide for the £8,500 purchase price and the £1,750 running costs each
year, and the present worth of £14,528 for Proposal 2 was sufficient to provide for the
£9,500 purchase price and the £1,500 running costs each year. However, 10 per cent
inflation causes the present worth of Proposal 1 to become £16,172.69 and provides for
the £8,500 purchase price, the £1,750 running costs each year and the additional running
costs incurred due to inflation.
Table 5.4 Calculated cash flows for Example 5.5
Year Proposal 1 Proposal 2
Original + Inflation = Adjusted Original + Inflation = Adjusted
cash flow adjustment cash flow cash flow adjustment cash flow
(£) (£) (£) (£) (£) (£)
0 08,500 0 8,500.00 9,500 0 9,500.00
1 1,750 175.00 1,925.00 1,500 150.00 1,650.00
2 1,750 367.50 2,117.50 1,500 315.00 1,815.00
Economic comparisons of equipment alternatives 69
The £16,076.58 present worth of Proposal 2 provides the £9,500 purchase price, the
£1,500 running costs each year and smaller additional running costs due to inflation.
Example 5.6
In Example 5.5 the cash flows from Example 5.1 were adjusted to include an inflation
rate of 10 per cent per annum (refer to Table 5.6).
This adjustment was achieved by adding 10 per cent to the first year cash flows and 10
per cent+10 per cent to the second year cash flows, and so on. This can be represented as
shown in Table 5.7, where d represents the inflation rate (0.1 for 10 per cent).
To calculate the present worth of each of these adjusted cash flows, multiply each year
by the present worth factor, as, for example, year three:
Year Cash flow Present worth factor
3
3 £1,750×(1 + d) × 0.65751
The present worth factor, 0.65751, was taken from the tables in the Appendix or
calculated from the expression 1/(1+i)n, where i is the interest rate and n is the number of
years. In this case i=0.15 (for 15 per cent) and n=3.
Table 5.7 Proposal 1 inflation adjustment for
Example 5.6
Year Proposal 1
Original cash flow (£) × Inflation adjustment
0 8,500
1 1,750 (1+d)1
2 1,750 (1+d)2
3 1,750 (1+d)3
4 1,750 (1+d)4
5 1,750 (1+d)5
This calculation can be simplified by the following adjustment: for (1+i)n, substitute
(1+d)n (1+e)n, where d is the inflation rate as before and e is calculated such that:
Economic comparisons of equipment alternatives 71
giving:
and
The present worth in the original example was calculated by multiplying the cash flow by
the present worth factor 1/((1+i)n), and so the present worth calculated above differs only
in the interest rate used. The inflation adjustment has been transferred from the cash flow
to the interest rate.
Given the interest rate i=0.15 (15 per cent) and the inflation rate d=0.10 (10 per cent):
Therefore, the present worth of Proposal 1, using the interest rate adjusted for inflation is
as shown in Table 5.8. The present worth calculated from the original cash flows and the
adjusted interest rate gives a value of £16,172.69, which is the same as that given by
Example 5.5, where the interest rate was kept at 15 per cent and the cash flows were
adjusted for inflation.
The adjusted interest rate of 4.54 per cent is measuring the interest earned in excess of
the inflation rate, and by taking the effect of inflation away from the interest rate it is
possible to calculate present worths which allow for the effect of inflation. Calculating
the present worth with the adjusted interest rate involves less work than first adjusting the
cash flows and then calculating the present worth. Consequently, the method of adjusting
the interest rate to allow for inflation is the most commonly employed. This technique
allows for the effects of inflation by reducing the actual interest earned from the apparent
rate to an ‘effective’ or ‘real’ rate.
In Example 5.6 the interest rate was 15 per cent. This would be the rate that the
investor would take to represent the value of money and in all probability would be
equated to an interest rate that could be earned in investments deposited elsewhere. The
inflation rate used was 10 per cent and the ‘effective’ interest was calculated at 4.54 per
cent for the following reasons. £100 at present-day prices would, at the end of the first
year, with inflation at 10 per cent, be equivalent to £110, and the amount required for
Management of off-highway plant and equipment 72
Another example would be to assume an interest rate of 15 per cent and an inflation rate
of 15 per cent. Since the inflation rate and the rate at which interest is earned are the
same, the effective rate becomes zero, as follows:
Thus, if £100 at present day prices were due at the end of one year and inflation at 15 per
cent made this £115, the amount required to be invested today at 15 per cent to produce
£115 in one year would be £115×0.86956=£100 (0.86956 is the present worth factor for
15 per cent). If the £100 required at the end of one year were left and the effect of
inflation taken away from the interest rate, then the amount required today at zero per
cent would be £100×1.0=£100, where 1.0 is the present worth factor for zero per cent.
The amount required by both calculations is the same.
This example is particularly noteworthy because, if inflation rates and interest rates are
equal, calculating present worths taking account of inflation simply involves summing
the cash flows estimated at present prices. The effect of inflation totally eliminates the
earned interest.
A final example would be to assume an interest rate of 15 per cent, as before, but an
inflation rate of 20 per cent so that the inflation rate is greater than the rate at which
interest can be earned. The effective rate then becomes −4.16 per cent as follows:
Thus, if £100 at present-day prices were due at the end of one year and inflation at 20 per
cent would make this £120, the amount required to be invested today at 15 per cent to
Economic comparisons of equipment alternatives 73
produce £120 in one year would be £120×0.86956=£104.34, where 0.86956 is the present
worth factor for 15 per cent. If the £100 required at the end of one year were left and the
effect of inflation taken away from the interest rate, then the amount required today at
−4.16 per cent would be £100×1/(1−0.0416)1=£100×1.0434=£104.34, where 1.0434 is
the present worth factor for −4.16 per cent. It is to be noted that the present worth factor
had to be calculated from the expression 1/(1+i)n because negative interest rates are not
usually tabulated. Again the amounts required calculated by the two methods are the
same.
Thus, this method of adjusting the interest rate is valid for all interest and inflation
rates and, by producing cash flows estimated on the basis of present-day prices, the effect
of inflation at various rates can be easily assessed, using a range of assumed inflation
rates. The following example illustrates the application of this technique to Example 5.2.
Example 5.7
Year Cash flow for the purchase, operating and resale of an item of equipment (£)
0 −8,500
1 −1,750
2 −1,850
3 −2,000
4 −2,200
5 −2,500 + 4,000
The cash flows estimated at present-day prices reflect only the increasing cost of
operating the equipment and not increases due to inflation.
Management of off-highway plant and equipment 74
The value of money is 15 per cent. The present worth, as shown in Example 5.2, is
£13,247.72. If inflation over the next five years is estimated at 12 per cent, the effective
interest rate would be 2.68 per cent, calculated as follows
The present worth of the cash flows, allowing for inflation at 12 per cent, is £14,471.42,
calculated as presented in Table 5.9. This £14,471.42 is the present worth of the original
cash flows plus the present worth of the additional cash flows that would have to be
included for inflation.
Example 5.8
Proposal 1
Table 5.10 shows the cash flow adjustments for Proposal 1. When calculated, these
figures become:
Table 5.10 Varying inflation rates for Example 5.8
Year Original cash flows Proposal 1: inflation adjustments
(£)
For year For year For year For year For year
1 2 3 4 5
0 8,500.00
1 (1,750.00 +10 %)
2 ((1,750.00 +10 %) +10 %)
3 (((1,750.00 +10 %) +10 %) +12 %)
4 ((((1,750.00 +10 %) +10 %) +12 %) +14 %)
5 (((((1,750.00 +10 %) +10 %) +12 %) +14 %) +14 %)
Economic comparisons of equipment alternatives 75
Similarly, the cash flows for Proposal 2 can be adjusted for inflation as follows:
Year Proposal 2 cash flows including inflation adjustment (£)
0 9,500.00
1 1,650.00
2 1,815.00
3 2,032.80
4 2,317.39
5 2,641.83
The present worths of both proposals, calculated at 15 per cent, are £16,412.50 for
Proposal 1 and £16,282.14 for Proposal 2. Thus, with this inflation pattern and interest at
15 per cent, Proposal 2 is the more economic.
the item of equipment. Economic comparisons, based on present worth, can be used to
determine the value of the equipment to the owner.
Example 5.9
An item of equipment, the original purchase price of which was £10,000, and which has
been in use for two years, has a remaining useful life of four years and the estimated
running costs at present prices for the next four years are £661.25, £766.44, £874.50 and
£1,005.68. The estimated resale value at the end of the four years is £2,000. Thus, the
cash flows are:
Year Cash flows for existing plant item (£)
0
1 −661.25
2 −766.44
3 −874.50
4 −1,005.68 + 2,000
Note that there is no cash flow in year zero, because the plant item is already owned. The
present worth of these cash flows, using an interest rate of 10 per cent, is £1,212.45,
calculated as shown in Table 5.11.
If this item of equipment were not available to the owner, an alternative method of
providing the equipment would be necessary and the present worth of the alternative
method would have to be calculated and compared with that for the equipment already
owned.
The difference between the two present worths is an estimate of the value of the
equipment to the owner. The difference is £7,924.50−£1,212.45=£6,712.05, and if the
owner were able to sell the equipment for £6,712.05 and to offset this against the cost of
hiring, then the present worth of cash flows for hiring would be exactly the same as that
for already owning the equipment. If the owner were able to sell the equipment for more
than £6,712.05, it would be more economic to do so and to hire the equipment. If
£6,712.05 could not be realised by selling the existing equipment, it would be more
economic to retain the existing item of equipment.
If the effects of inflation were to be introduced, this could be achieved by adjusting the
interest rates as explained previously, in the section dealing with inflation adjustments.
Example 5.10
The cash flows estimated at present prices for purchasing, operating and reselling after
four years for a similar item of equipment are:
Year Cash flow for purchase, operating and resale for new item of equipment (£)
0 −11,000.00
1 −400.00
2 −460.00
3 −529.00
4 −608.35+4,000
The present worth of these cash flows, using an interest rate of 10 per cent, is calculated
as shown in Table 5.12.
The difference between the present worth of keeping the existing equipment and
replacing immediately with a new item of equipment is:
£9,824.71−£1,212.45=£8,612.26. Thus, if the owner could sell the existing equipment for
£8,612.26 and offset this against the cost of the new equipment, the present worth of
acquiring the new equipment would be the same as keeping the existing item of
equipment. If the owner could sell the item of equipment for more than £8,612.26, then it
would be more economic to sell and replace; if £8,612.26 could not be realised from the
sale of the equipment, it would be more economic to retain the equipment.
Management of off-highway plant and equipment 78
If the effects of inflation were to be introduced, this could be achieved by adjusting the
interest rates as explained previously, in the section dealing with inflation adjustments.
Table 5.12 Present worth calculation for buying
new equipment for Example 5.10
Year Cash flows for new item of equipment Present worth factors Present worth
(£) (10%) (£)
0 −11,000.00 1.0 −11,000.00
1 −400.00 0.90909 −363.64
2 −460.00 0.82644 −380.16
3 −529.00 0.75131 −397.44
4 −608.35+4,000 0.68301 +2,316.53
Total present worth −9,824.71
The above valuations have been calculated from the useful life of the existing item of
equipment. This was estimated at four years, the equipment already being two years old
and having a total life of six years. If the need for the equipment extended for, say, 20
years, the comparison would also need to be extended for that time period. Thus, the cost
of keeping the existing equipment and its subsequent replacements must be compared
with the cost of immediate replacement and subsequent replacements. The replacements
will all be estimated at the same costs as the immediate replacements, as all cash flows
are estimated at present prices and the effects of inflation incorporated separately.
Example 5.11
The cash flows for keeping the existing item of equipment and subsequent replacements
for 20 years are as illustrated in Table 5.13 whilst the cash flows for immediate
replacement with a new item of equipment and replacements for 20 years are provided in
Table 5.14.
To compare these cash flows, the present worth of both must be calculated and the
present worth of the immediate replacement can be calculated as shown in Table 5.15,
using an interest rate of 10 per cent.
Thus, the cash flows for the immediate and subsequent replacements can be
represented as:
Year Cash flow (£)
0 −12,316.35
6 −12,316.35
Economic comparisons of equipment alternatives 79
12 −12,316.35
18 −11,000.00
19 −400.00
20 −460.00+8,000
The £12,316.35 at years zero, six and 12 represents all the cash flows for the
replacements purchased in those years, and the present worth for the immediate and
subsequent replacements up to 20 years is £24,115.92, calculated as shown in Table 5.16.
Table 5.13 Cash flows for retention/subsequent
replacements for Example 5.11
Year Cash flows
Running costs Resale of Purchase of Running costs of Resale of
of existing existing replacements replacements replacements
equipment (£) equipment (£) (£) (£) (£)
0 –
1 −661.25
2 −766.44
3 −874.50
4 −1,005.68 +2,000.00 −11,000.00
5 −400.00
6 −460.00
7 −529.00
8 −608.35
9 −699.60
10 −11,000.00 −804.54 +2,000
11 −400.00
12 −460.00
13 −529.00
14 −608.35
15 −699.60
16 −11,000.00 −804.54 +2,000
17 −400.00
18 −460.00
19 −529.00
Management of off-highway plant and equipment 80
20 −608.35 +4,000
The present worth of keeping the existing equipment until the end of its useful life and its
subsequent replacement can be calculated first by representing the cash flows as shown:
Year Cash flows (£)
0 −1,212.45
4 −12,316.35
10 −12,316.35
16 −11,000.00
17 −400.00
18 −460.00
19 −529.00
20 −608.35+4,000
The £1,212.45, taken from Example 5.9, represents all the cash flows for the existing
item of equipment.
The £12,316.35 in years four and ten is used to represent all the cash flows for the
replacement in those years. Consequently, the present worth for keeping the existing
plant item until the end of its useful life and subsequent replacements up to 20 years is
£16,511.14, calculated as shown in Table 5.17.
Management of off-highway plant and equipment 82
against the cost of the immediate replacement, the present worth of the immediate and
subsequent replacements would be the same as keeping the existing item. If the owner
could sell the existing equipment for more than £7,604.78, the acquiring of an immediate
replacement would be more economic. If £7,604.78 could not be realised by the sale of
the existing equipment, then keeping the existing equipment would be more economic.
If the effects of inflation were to be introduced, this could be achieved by adjusting the
interest rates as explained previously, in the section dealing with inflation adjustments.
The above calculation was based on an overall duration of 20 years, and the present
worths were comparable because they were calculated for equal periods of time. The life
of the equipment is six years. With immediate and subsequent replacements the 20 years
is made up by disposing of the replacement in year 18 after two years, and by adjusting
the resale value of this last replacement. Similarly, the last replacement in the case of
keeping the existing equipment and replacing from year four onwards occurs in year 16,
and again the resale value of this last replacement has been adjusted.
Example 5.12
6 −12,316.35
12 −12,316.35
18 −12,316.35
24 −12,316.35
… …
… …
… …
∞ ∞
The £12,316.35 is the present worth of purchasing, operating and reselling the new
equipment. This present worth was calculated previously as part of Example 5.11. If this
equipment is replaced every six years, this amount recurs every six years to infinity.
The present worth of a sum recurring every year, starting at the end of the first year, is
given by the factor ((1+i)n−1)/(i(1+i)n) which is the uniform series present worth factor
given in the Appendix.
The present worth of a sum recurring not every year but every y years, starting in y
years, is given by the factor 1/((1+i)y−1). Thus, if the sum recurring every y years were x,
the present worth would be
and if the sum x occurred in year zero, the total present worth of the whole series would
be
which reduces to
Thus, substituting £12,316.35 for x, six years for y and 10 per cent for i, the present worth
of the series starting in year zero and recurring to infinity is
The 0.56447 can be taken from tables, since the element 1/(1+i)y is the expression for the
present worth factor.
The amount calculated, £28,278.99 represents the amount that would be required
today which, if invested at 10 per cent, would produce £12,316.35 every six years
forever. This can be checked as follows. First take away the initial £12,316.35; this leaves
£15,962.64 for investment. In six years this £15,962.64 would increase to
£15,962.64×1.77156= £28,278.99. This £28,278.99 is made up of the original capital
Management of off-highway plant and equipment 84
£15,962.64, and interest earned in those six years of £12,316.35. The factor 1.77156 is
the compound amount factor for 10 per cent and is taken from tables in the Appendix.
Thus, the sum of £12,316.35 can be used every six years to provide replacement
equipment. This £12,316.35 is the interest earned on the capital of £15,962.64 and is
entirely used up every six years. The capital of £15,962.64 remains undepleted and can
go on producing £12,316.35 every six years indefinitely.
The £12,316.35 is the present worth of purchasing, operating and reselling the
equipment item, and £28,278.99 is the present worth of purchasing, operating and
reselling every six years in perpetuity. This present worth is sometimes called the
capitalised cost.
To arrive at a valuation of the existing equipment, it is necessary to calculate the
capitalised cost of the cash flows relating to the scheme whereby the existing equipment
is
Table 5.18 Cash flows for keeping existing
equipment and its replacements for Example 5.12
Year Cash flows for keeping existing equipment and its replacements
Running costs of existing equipment (£) Resale (£) Replacements (£)
0 –
1 −661.25
2 −766.44
3 −874.50
4 −1,005.68 +2,000
10 −12,316.35
16 −12,316.35
22 −12,316.35
28 −12,316.35
… …
… …
… …
∞ ∞
retained – that is, the present worth of the existing equipment and its replacements to
infinity. Taking the cash flows from Example 5.11 for keeping the existing equipment
and its replacements these can be represented as shown in Table 5.18.
The cash flows in years 1–4 representing the running costs of the existing equipment
and the resale value have a present worth of £1,212.45, as calculated in Example 5.9.
The £12,316.35 every six years has a present worth of £28,278.99, as calculated in
Example 5.11. However, in this set of cash flows the first of the £12,316.35 occurs in
Economic comparisons of equipment alternatives 85
year four and the cash flows for keeping the existing equipment and its replacements to
infinity can be represented as follows:
Year Cash flows for keeping the existing equipment and its replacements (£)
0 −1,212.45
4 −28,278.99
Given an interest rate of 10 per cent, £20,527.28 is the amount required for investment
today to give £1,212.45 in year zero, enough for the existing equipment, and £28,278.99
in year four, enough for the replacements at £12,316.35 every six years until infinity.
Thus, £20,527.28 is the capitalised cost of keeping the existing equipment and then
replacing it in perpetuity.
The difference between the capitalised cost of keeping the existing equipment and its
immediate replacement is the value to the owner of the existing equipment. The
difference is £28,278.99−£20,527.28=£7,751.71. This £7,751.71 is the amount that could
be compared with the market value when considering disposal. The value calculated here
is only slightly different from that calculated for replacements up to 20 years, because the
present worth factors become smaller with increasing time and the effect of cash flows
beyond 20 years on such calculations is small.
If the effects of inflation were to be incorporated in this calculation, this would be
achieved by adjusting the interest rates as explained previously, in the section dealing
with inflation adjustments.
The factors that determine the economic replacement age of equipment are the purchase
price, the operating costs and the resale value. The purchase price is relevant because the
equipment must be kept long enough to warrant the investment. The operating costs
usually increase with ageing equipment and it is, therefore, important not to keep the
equipment too long. Also, as these operating costs increase the resale value declines. The
purpose of an economic analysis is to find the balance between these. As the comparisons
are being made between keeping equipment for one, two, three or four years, etc., the use
of present worth presents the difficulty of equalising the lives of the comparisons. This
may be achieved by considering replacements to infinity. As the operating costs are not
usually uniform, the use of EACs is not easily applied either. Thus, neither present worth
nor EACs offer any real advantage in this comparison. The method presented here is
based on EACs.
Example 5.13
The purchase price of a small concrete batching unit is £25,000. The operating costs,
based on the estimated annual average hours of use, are £1,000 in the first year when
manufacturers’ warranties operate, and £1,500 in the second year, rising by £375.00 per
year thereafter. The resale values are:
Year Predicted resale values (£)
1 22,500
2 20,000
3 18,750
4 15,000
5 10,000
6 6,250
The calculations to determine the EAC of keeping this equipment for one, two, three and
four years, etc., are set out in Table 5.19. Most of the entries in Table 5.19, which
calculate the EACs for one, two, three, etc., years, are self-explanatory.
Column C shows the EAC of the purchase price. For example, if the equipment were
kept for four years, the EAC of the purchase price would be £8,750 per year.
Table 5.19 Determining replacement age by use of
EACs
Year A B C D E F G H I K L M N
Purchase Capital EAC of Running Present Present Sum of EAC of EACs of Resale Present EACs of EACs of
price (£) recovery purchase costs worth worth of present present purchases value worth of resale (B purchase
factors price (A (£) factors running worth of worth of price and (£) resale (K × L) (£) running
for 15% × B) (£) at 15% costs (D running running running × E) (£) and
× E) (£) costs (Σ costs (B costs (C resales
F) (£) × G) (£) + H) (£) (I − M)
(£)
0 25,000 1.0
1 1.150 28,750 1,000 0.869 869.00 869.00 999.35 29,749.35 22,500 19,552.50 22,500.00 7,249.35
2 0.615 15,375 1,500 0.756 1,134.00 2,003.00 1,231.84 16,606.84 20,000 15,120.00 9,298.00 7,308.04
3 0.437 10,295 1,875 0.657 1,231.88 3,234.88 1,413.64 12,338.64 18,750 12,318.75 5,383.29 6,955.35
4 0.350 8,750 2,250 0.571 1,284.75 4,519.63 1,581.87 10,331.87 15,000 8,565.00 2,997.75 7,334.12
5 0.298 7,450 2,625 0.497 1,304.63 5,824.26 1,735.62 9,185.62 10,000 4,970.00 1,481.06 7,704.56
6 0.264 6,600 3,000 0.432 1,296.00 7,120.26 1,879.74 8,479.74 6,250 2,700.00 712.80 7,766.94
Note
The minimum in column N, £6,955.35, is the minimum EAC.
Economic comparisons of equipment alternatives 87
Column F is the present worth of the running costs. In year four the running costs for that
year were £2,250, and the present worth of this amount is £1,284.75: that is, the amount
required to be invested in year zero to provide £2,250 in year four is £1,284.75.
Column G is the running total of the present worths of the running costs, so £3,234.88
is the sum of the present worths for years one, two and three. Thus, if £3,234.88 were
invested in year zero at 15 per cent it would provide enough to pay for the running costs
of years one, two and three.
Column H is the EAC of the present worth of the running costs. Taking the £3,234.88
for year 3 from column G and converting it to an annual sum, using the capital recovery
factor gives £1,413.64, and the running costs of £1,000, £1,500 and £1,875 for years one,
two and three are now converted to a uniform series of £1,413.64 per year. The
calculations in columns F, G and H are devices to convert the varying operating costs to a
uniform series.
Column I is the EAC for the purchase price added to the EAC for the running costs.
Column L is the present worth of the resale value. £12,318.75 in year three is the
present worth of the resale value of £18,750 in year three.
Column M is the EAC of the resale value. Thus, £5,383.28 for year three is the EAC
of £12,318.75 from column L.
Column N is the EAC of the resale subtracted from the EACs of the purchase price
and running cost. This gives the net EAC for purchase, operating and resale for years 1–
6. Thus, the minimum in column N is the minimum EAC and the best replacement age by
this economic criterion. The minimum is £6,955.35 in year three.
The effects of inflation could be incorporated by adjusting the interest rates that were
used to calculate the present worth, but not the interest rate used to calculate the EACs.
Chapter 6
Equipment profitability and acquisition
Measuring profitability
The economic analyses described in Chapter 5 have related to schemes whereby only the
expenditure was considered. The purchase price and running or operating costs were not
offset in the calculations against any revenue, and the only monies returning to the
investor were from resale. Thus, the previous analyses were confined to determining
whether one course of action – say the purchase of one particular item of equipment –
was more economic than another course of action, the purchase of an alternative item.
What will be considered now is the situation where the equipment generates a revenue.
The simplest situation to imagine is where the equipment is purchased and hired out so
that the owner has capital expenditure, operating costs, revenue and resale value. The
analysis required now is not simply whether one item is more economic than another but
whether the item is earning an adequate return on the invested capital. That is, whether
the return on capital derived from owning and hiring out equipment is better than could
be obtained from less risky investment elsewhere or, if the capital to buy the equipment is
borrowed, whether the return is greater than the cost of capital as measured by the interest
on the capital. The capital made available by the organisation to purchase the equipment
should earn at least the minimum return expected by the organisation. This analysis,
therefore, requires that the rate of return be measured and the most widely used method is
known as the ‘internal rate of return’, ‘yield’ or ‘discounted cash flow (DCF) yield’. All
these are names for the same measure of profitability.
The interest factors used in this chapter are taken from the Appendix.
These cash flows are assumed to have been derived from a cash flow tree calculation
similar to that described. These net cash flows show a pattern of negative, outgoing, cash
flow in the beginning, followed by positive, incoming, cash flows in the subsequent
years. The DCF yield or internal rate of return is a measure of the return on the capital
invested of −£1,000.00, given by the positive cash flows occurring in years 1–4.
DCF yield or internal rate of return has two definitions:
1 The DCF yield or rate of return is the maximum interest rate that could be paid for
borrowed capital, assuming that all the capital required to fund the project is acquired
as an overdraft and all the positive cash flows are used to repay this overdraft.
2 The DCF yield or rate of return is the interest rate which, if used to discount a project’s
cash flow, will give a net present value (or worth) of zero.
The second of these definitions is more usually employed in calculating the yield, and is
also the definition that has given rise to the name ‘DCF yield’. It is also the more difficult
to understand at first reading, so the example will be calculated in the first instance using
the first definition.
Calculation of DCF yield by the first definition is a process of trial and error. An
interest rate is assumed and tested to determine whether it is the maximum: if it is above
the maximum, a new trial with a smaller interest rate is used; if it is below the maximum,
a new trial with a larger interest rate is used until the maximum is found, eventually by
interpolation, if necessary. Using an interest rate of 12 per cent as the first trial rate, the
test as to whether this is the maximum is shown in Table 6.1.
In year zero the amount borrowed was −£1,000.00 and the interest on this during year
one was −£120.00. Thus, at the end of year 1 the borrowing account was the original
−£1,000.00 together with the interest of −£120.00 offset by the income of +£315.47,
leaving −£804.53 in the borrowing account. Repeating this calculation until the end of the
project indicates that there is −£65.79 left in the account. Thus, this project could not
have paid interest at 12 per cent on the borrowed capital, because to do so would require
£65.79 from other sources. Thus, 12 per cent is greater than the maximum interest rate
that this project could support and the trial and error process continues with a smaller
interest rate. Suppose that the guess is 8 per cent: the test as to whether this is the
maximum is shown in Table 6.2.
Proceeding through the calculations as before, the amount left in the account at the end
of the project is +£61.05. Thus, this project could have paid more for its borrowed capital
than 8 per cent, which is therefore less than the maximum interest rate.
Given that 12 per cent is greater than the maximum interest rate and 8 per cent is less
than the maximum interest rate, the maximum clearly lies between the two. Therefore,
the next
Table 6.1 Calculation of DCF yield – trial one 12%
Year Net cash flow Interest paid on borrowed capital at 12% Borrowing account
(£) (£) (£)
0 −1,000.00 – −1,000.00
1 +315.47 −120.00 −804.53
Equipment profitability and aquisition 91
reasonable guess would be 10 per cent. The trial to determine whether 10 per cent is the
maximum is illustrated in Table 6.3.
Performing the calculation as before shows that an amount of zero would be left in the
borrowing account. Thus, 10 per cent is the maximum interest rate that could be paid for
the borrowed capital in this project, and by definition (1) 10 per cent is the DCF yield.
Measuring this maximum that could be paid for the borrowed capital is a way of
measuring how much the project cash flows are producing. Measuring the amount that
can be taken away (by interest charges) shows how much the project is producing. Also,
this measure (the DCF yield or rate of return) is directly comparable with the cost of
capital, the cost of capital being the weighted average of the costs of all sources of capital
used by the organisation. If the organisation were paying more for its capital than 10 per
cent, the project would not be satisfactory, because it would not be yielding more than
borrowing the capital is costing.
The method more commonly employed in calculating the DCF yield is according to
definition (2). Calculating the DCF yield by the second definition is also a trial and error
process which also requires an assumed interest rate and a trial to determine whether the
Management of off-highway plant and equipment 92
assumed interest rate gives a net present value (NPV) or worth of zero. If the calculated
NPV is negative the assumed interest rate is too large and a smaller one is assumed and
the NPV is recalculated. If the calculated NPV is positive the assumed interest is too
small. The process is repeated until the interest rate which gives a zero NPV is found – by
interpolation, if necessary.
Using 9 per cent as a first trial, the NPV is calculated and found to be positive; a larger
interest rate of 11 per cent is then used to produce a negative NPV (refer to Table 6.4).
Interpolation produces the interest rate which gives an NPV of zero and is found to be
10 per cent, as before.
Table 6.4 Calculating present worth based on
uniform revenues
Year Net cash Present worth Present Present worth Present
flow (£) factors for 9% (1st worth (£) factors for 11% worth (£)
trial) (2nd trial)
0 −1,000.00 1.0 −1,000.00 1.0 −1,000.00
1 +315.47 0.91743 +289.42 0.90090 +284.21
2 +315.47 0.84168 +265.52 0.81162 +256.04
3 +315.47 0.77218 +243.60 0.73119 +230.67
4 +315.47 0.70842 +223.49 0.65873 +207.81
+22.03 −21.27
The present worth factors are taken from tables or calculated as 1/(1+i)n. This 10.0 per
cent has exactly the same meaning as the 10.0 per cent calculated by the first definition.
The trial and error process that produces the interest rate that gives an NPV of zero can
be understood by examining the graph of NPV against interest rates as shown in Figure
6.2. Any minor discrepancy between the interpolated value and 10 per cent is due to
interpolation which assumes that the graph in Figure 6.2 is linear between 9 and 11 per
cent. It is, in fact, slightly curved.
To understand further the meaning of this calculated interest rate which has been given
the name ‘DCF yield’ or ‘internal rate of return’ consider this question: if £1,000 were
invested at 10 per cent, what regular income could be taken each year for the next four
years?
The capital recovery factor for 10 per cent and four years is 0.31547. This factor is
taken from the tables in the Appendix. Thus, the income that could be taken each year for
four years from £1,000 invested at 10 per cent is:
This £315.47 is the same as the net cash flow in the example used.
Given a capital sum and an interest rate, the income can be calculated. Also, given the
capital sum and the income, the interest rate that would produce that income from that
capital sum can be calculated. This interest rate is called the DCF yield or the internal
rate of return.
This example was based on uniform revenues, but the searching techniques for DCF
yield will work equally well for non-uniform revenues, as shown in the next example, in
which the net cash flows are:
Year Net cash flows (£)
0 −10,000
1 +2,800
2 +3,000
3 +2,500
4 +2,300
5 +2,200
The DCF yield is 9.35 per cent, calculated using two trial interest rates of 9 and 11 per
cent and then interpolation (as shown in Table 6.5).
Management of off-highway plant and equipment 94
Interpolation:
The yield or rate of return is the most widely used measure of profitability.
that the project continues to have positive net revenues for a number of years after the
payback period.
The average annual rate of return is all the returns (positive cash flows) for the
project averaged over the number of years the project lasts and expressed as a percentage
of the invested capital. Like the payback period, the average annual rate of return is not
very useful without first determining what a satisfactory rate should be. An average
annual rate of return of 33 per cent and a payback period of three years are similar. The
higher this rate of return the more profitable the project.
The payback period or the average annual rate of return are never used on their own as
measures of profitability but always in conjunction with other measures, such as NPV or
even DCF yield.
on these net revenues if no capital allowances were in operation. The corporation tax in
column C is time-shifted by one year to reflect the tax time-lag. Thus, the £7,500 of
calculated corporation tax shown in year two is calculated on the net revenues shown in
year one in column B.
Column D shows the capital allowance of £50,000, calculated at 25 per cent written
down of the purchase price, and a balancing allowance of £8,325.79, calculated on the
resale value. The balancing allowance is to compensate for the £15,000 of capital
returning to the business from the resale. Having already received a capital allowance of
£43,325.79 (the aggregate of column D) on the original £50,000, the organisation now
Management of off-highway plant and equipment 98
finds that the capital invested was only £35,000, made up of £50,000−£15,000: hence the
balancing allowance.
Column E is the tax saved by the capital allowance, calculated as the capital allowance
times the tax rate. The tax due on the balancing allowance is also calculated at the
balancing allowance times the tax rate.
Column F is the tax paid, which is column C, less the savings in column E or plus the
tax due in column E.
Column G is the net cash flows after tax. The capital invested in year zero is offset by
the tax saving that year. Year 1 is the £25,000 net revenue from column B plus the tax
saving from column F. The explanation for this is that the tax savings can only be taken if
the profits and, hence, the tax due are sufficient to accommodate the savings. If this
project were the only project the organisation had, then the profits and the tax in year 1
would be insufficient and the tax saving would have to be rolled forward to be absorbed
in later years. However, it was assumed that this was a large organisation, and it is further
assumed that this large organisation has sufficient profits to accommodate this saving in
years zero or one of this project.
Because this project has given rise to those savings (cash that would otherwise have
left the organisation), the savings are credited to this project. Years 2–5 are the net
revenues from column B, less the tax in column F. Year 6 is the resale value plus the net
revenue from column B, less the tax in column F. Year 7 is the tax from the column F.
The introduction of corporation tax and capital allowances greatly reduces the profit
but it also distorts the cash flows. The cash flow in year 1, for example, is larger than
before tax considerations, while the others are much smaller. The calculations in Tables
6.8 and 6.9 compare the yields obtained before and after tax.
The results are:
Payback period 2.13 years
DCF yield 31.43%
Before calculating the yield after tax, it is necessary to adjust the cash flows to remove
the negative cash flow in year 7. The method of calculation explained previously is
known as the single rate calculation and is not suitable for cash flows that have negatives
anywhere other than the starting years. If used on cash flows with large negative cash
flows at the end, it could produce more than one interest rate, giving a zero NPV. To
overcome this, provision is made for the negative cash flow by taking a suitable amount
from the previous year’s positive cash flow. The amount set aside is the negative cash
amount discounted by one year. The rate used to discount the negative cash flow is called
the ‘earning rate’ and represents the return that can be obtained from a safe investment.
Thus, using an earning rate of 10 per cent, the negative cash flow of £3,997.73 in year 7
can be discounted to £3,633.93 (£3,997.73×0.9090, is the present worth factor taken from
tables). If this £3,633.93 is
Table 6.8 Calculation of yield before tax
Year Cash flow (£)
0 −50,000
Equipment profitability and aquisition 99
1 +25,000
2 +23,000
3 +16,000
4 +14,000
5 +8,000
6 +20,000
deducted from the positive cash flow of £18,267.41 in year 6, then year 6s cash flow
becomes £14,633.11. Thus, the £3,633.93 removed from year 6 provides for the negative
cash flow in year 7 and the cash flows are now suitable for a single rate DCF yield
calculation as before.
The results of the calculations after tax are:
Payback period 2.06 years
DCF yield 27.85%
Thus, although the corporation tax removed considerable amounts from this investment
project, the yield rate of return was reduced only from 31.43 to 27.85 per cent. The
reason for the yield remaining so high is the distortion in the cash flows brought about by
the 100 per cent capital allowance in the first year. This gave the net cash flows a
relatively large positive cash flow in year 1. This occurred only because the tax saving
arising from the capital allowance was taken and credited to this project. If the
organisation were unable, owing to lack of profit, to take immediately the benefit of the
tax savings given by the capital allowances and had to delay taking the savings until
enough profits were available, the yield after tax would fall. Thus, the benefits of capital
allowances are at their greatest when the organisation is trading profitably enough to use
the capital allowances immediately.
The example shown here was presented in the form of appraising a proposed
investment, the cash flows of which were estimated at present prices. Taxation, of course,
would be calculated on the actual cash flows as they occurred. These actual cash flows
Management of off-highway plant and equipment 100
would be subjected to inflation and would reflect the effects of inflation. The effects of
inflation on yield calculations are explained in the next section.
As the estimates were based on present-day prices, this 8.00 per cent yield does not
include any effects of inflation.
Including inflation at the uniform rate of 10 per cent per year on both the operating
costs and the operating revenues, the cash flows adjusted for inflation are as shown in
Table 6.12.
The revised net cash flows are in fact simply the original net cash flows inflated at 10
per cent per year. The yield of these cash flows, which now include inflation, is
calculated as shown in Table 6.13.
Table 6.10 Cash flow estimates for purchasing and
hiring an item of equipment
Year Cash flows
Investment (£) Operating costs (£) Operating revenue (£) Net cash flows (£)
0 10,000 −10,000
1 3,000 6,000 +3,000
2 3,500 7,000 +3,500
3 4,000 7,000 +3,000
4 4,500 7,000 +2,500
By interpolation:
Management of off-highway plant and equipment 102
This yield, calculated on the revised cash flow, is larger than the yield calculated on the
original cash flows, because the revised positive cash flows themselves were larger.
These cash flows were larger because of the inflation included in them. The £3,993
revised net cash flow in year 3 does not buy any more goods than the £3,000 original net
cash flow. The difference between the two amounts is cancelled by inflation. The £993
more in the revised cash flows just compensates for the inflation at 10 per cent per year.
Thus, although the revised positive net cash flows are larger and, hence, the yield is
larger at 18.8 per cent, the investor is no better off, because the extra monies acquired are
absorbed by inflation. Thus, 8 per cent on the original uninflated cash flows is equivalent
to 18.8 per cent on the revised inflated cash flows. To distinguish between these two rates
of return, the rate of return calculated on the estimates which did not include inflation, the
original uninflated cash flows, is called the real rate of return. The rate of return
calculated on the estimates which include inflation, the revised inflated cash flows, is
called the apparent rate of return.
The relationship between these two rates of return is through the inflation rate. The
apparent rate of return is the real rate of return, increased by the inflation rate as follows:
where a is the apparent rate of return, r is the real rate of return and d is the inflation rate.
Substituting the values calculated from Tables 6.11 and 6.13 for a and r (a=0.188
(18.8 per cent) and r=0.08 (8 per cent)) into the expression gives a value for d, the
inflation rate:
Given the value of the calculated real rate of return at 8 per cent and the calculated
apparent rate of return at 18.8 per cent, the expression estimates that the inflation rate is
10 per cent. Since the inflation rate included in the estimates was 10 per cent, this serves
as a check on the above explanation.
As most proposed investments are appraised on estimates based on present-day prices,
the rate of return calculated and used to judge a proposal’s viability is normally the real
rate of return. Since the cash flows recorded as projects proceed are normally based on
the transactions that occur at current prices, the cash flows determined usually have
inflation included as a matter of course. Thus, the yield calculated on these recorded cash
flows will be the apparent rate of return. It is, therefore, important to distinguish whether
the cash flows are based on constant, year zero, prices or current prices when interpreting
the yield calculated.
The situation used to explain the relationship between real rate, apparent rate and the
inflation rate was one where the equipment owner was allowed to increase revenue at the
same rate as inflation. However, if this were not the case, the apparent rate would be less
than 18.8 per cent but the inflation would still be 10 per cent and the achieved real rate of
return would be less than the estimated real rate of return of 8 per cent.
The following example illustrates this. If the project originally described in Table 6.10
had been executed and completed, the cash flows could have been recorded. Throughout
Equipment profitability and aquisition 103
the duration of the project, inflation had been 10 per cent per year. Public spending cuts,
high interest rates and a general recession had made it impossible for equipment hirers to
raise the hire rates in line with inflation, although rates had increased to some extent.
Thus, the operating revenue, although increasing, had not kept pace with inflation. The
recorded cash flows are as shown in Table 6.14. The apparent rate of return calculated on
these recorded cash flows is 12.85 per cent, as calculated in Table 6.15.
Table 6.14 Cash flows recorded during the
execution of the project
Year Investment (£) Operating costs (£) Operating revenue (£) Net cash flow (£)
0 10,000.00 −10,000.00
1 3,300.00 6,435.00 +3,135.00
2 4,235.00 8,057.09 +3,822.09
3 5,324.00 8,747.50 +3,423.50
4 6,588.45 9,569.75 +2,981.30
By interpolation:
Thus, the achieved apparent rate of return is 12.85 per cent, but as inflation during this
time was 10 per cent per year, the real rate of return achieved is 2.59 per cent, calculated
as follows:
Management of off-highway plant and equipment 104
Thus, because the income or revenue was restrained from increasing at the rate of
inflation but costs were rising at the rate of inflation, the real rate of return was reduced to
2.59 per cent.
Other examples could be apparent rates of return of 10 per cent, inflation rates of 10
per cent and real rates of return of zero, or an apparent rate of 8 per cent, an inflation rate
of 10 per cent and a real rate of return of −1.8 per cent.
Inflation evidently reduces the real rate of return unless prices are allowed to rise to
compensate for its effects. This reduction in the real rate of return could drag the
achieved real rate of return below the cost of capital. In other words, the capital could
well be costing more than the project is yielding. In such a case the project is
uneconomic, and if such projects are sustained, the business will become bankrupt. The
first noticeable effect will probably be that the organisation cannot replace its equipment
and will either go on using ageing equipment or reduce its fleet.
The ‘construction’ equipment hire industry is particularly vulnerable to the effects of
inflation. This is because the construction industry is largely an industry that does not
create its own demand and is dependent on public works and public spending for a
substantial portion of its workload. The rest of the industry’s workload depends on the
private sector being willing to invest. If the cost of money, that is, interest rates, is high,
the private sector is discouraged from investing and the demand for construction work
declines. Since in times of rising inflation governments cut public spending while also
increasing interest rates, the demand for construction declines accordingly. As the
demand declines, prices for construction work fall and the equipment hire industry cannot
raise prices in line with inflation. As a result the gap between operating costs and revenue
is squeezed, with a consequential fall in the return on capital invested in the equipment.
Methods of acquisition
Much of Chapter 5 and the section on economic profitability (earlier in this chapter) dealt
with the economic analyses that help decide whether or not to acquire an item of
equipment, based mainly on the question: Does this proposed acquisition offer the
opportunity to earn an adequate rate of return and which of the possible items of
equipment is the most economic? So far the question of how the item of equipment
should be acquired has not been considered. There is a tendency in very large
organisations for the two decisions as to whether to acquire and how to acquire to be
taken separately, the specialist to acquire responsible for the decision as to whether to
acquire and the finance directors being responsible for the decision as to how to acquire.
In smaller organisations these two decisions often get merged. Major methods of
acquisition are reviewed in this chapter, and the relative advantages of each method are
highlighted.
Equipment profitability and aquisition 105
The decision to acquire an asset should be made for both technical and economic
reasons. The profitability of the proposal should be evaluated by calculating the expected
rate of return and comparing it with the cost of capital. The decision as to how to acquire
the asset can then be regarded as a financial one.
The major methods of acquisition can be classified as purchase, leasing or hiring. The
major factors that influence the decision as to which is the more advantageous are:
1 Tax legislation, which allows 25 per cent written down capital allowances against the
purchase of off-highway plant.
2 The profit flows of the acquiring organisation, which determine whether these
allowances can be turned into tax savings benefiting the organisation immediately or
rolled forward until later years, thus becoming devalued.
3 The acquiring organisation’s cash flows, which determine what money is available for
plant acquisition.
4 The acquiring organisation’s gearing ratio (borrowed capital/equity capital), which
influences the amount of further borrowing possible.
Purchase
Outright purchase
Outright purchase is simply payment of the purchase price by the acquiring organisation
to the supplier. This involves the acquiring organisation in a large cash payment very
early, before the equipment acquired has earned any revenue. However, outright purchase
provides the acquiring organisation with capital allowances of 25 per cent written down
of the purchase price of the equipment. If the acquiring organisation’s profit flows are
sufficient, these allowances can produce a saving of 30 per cent of the allowances. Thus,
an item of plant worth £10,000 would produce capital allowances of £2,500 immediately
and tax savings of £750.00 (£2,500×30 per cent, 30 per cent being the corporation tax
rate). This tax saving is most valuable but it is only available if the profit flows in the
business are £2,500 or more.
If the cash is available from within the organisation’s own resources or even from an
overdraft, this form of acquisition is probably the cheapest, provided that the capital
allowances can be used to produce the tax saving immediately. If the capital allowances
cannot be used immediately because the organisation’s profit flows are inadequate, then
the capital allowances can be rolled forward until sufficient profit flows are available. In
this situation the benefit of the capital allowances and derived tax savings become
devalued, in simple present worth (or value) terms, and in these circumstances outright
purchase may not be the cheapest method of acquisition.
Outright purchase places the title of the equipment immediately with the acquiring
organisation. This means that it becomes an asset over which the organisation has full
control; which it can use in negotiating finance; which it can use anywhere, including
overseas; and which it can dispose of to produce cash from its resale value.
Management of off-highway plant and equipment 106
Credit sale
A credit sale is a sale in which the acquiring takes the ownership or title of the plant item
immediately but the purchase price is paid in instalments. These instalments include the
purchase price plus any financing charges the vendor makes. Credit sales, like outright
purchase, attract capital allowances immediately and can be used in the same way as
outright purchase.
Hire purchase
Hire purchase and leasing are significantly different in the treatment of tax and therefore
must be considered quite separately. Hire purchase is a contract whereby the acquiring
organisation pays a regular hire charge and, at some predetermined point after payment of
a proportion of the agreed hire charges, the acquiring organisation buys the equipment for
a nominal sum. This facility to purchase distinguishes the hire purchase contract from
leasing, which, under UK tax legislation, does not permit the acquiring organisation to
purchase the leased equipment. Hire purchase also attracts the capital allowances as
though the equipment were purchased outright. Thus, in terms of tax savings, hire
purchase has the same advantages as outright purchase.
Both hire purchase and credit sales are likely to require deposits, but these deposits are
much less than the whole purchase price and therefore in cash flow considerations these
forms of acquisition are less demanding than outright purchase. However, the interest
charges included in hire purchase contracts are likely to be greater than those the
acquiring organisation would pay on an overdraft. Thus, if the hire purchase method of
acquisition is compared with outright purchase, outright purchase is cheaper in most
cases, the capital allowances available in both cases being the same.
Leasing
The leasing method of acquisition is different in concept from the previous methods
outlined. The difference is that the ownership or title of the equipment remains the
property of the leasing company (the lessor), and the acquiring organisation (the lessee)
never becomes the owner. The acquiring organisation (the lessee) only acquires the use of
the equipment in return for payments or rentals but never becomes the owner. While this
method is more common in the leasing of property, it is also used in the acquisition of the
use of capital equipment such as off-highway plant and equipment. Although there is a
plethora of leasing arrangements, they all adhere to the basic principle that the lessor is
the owner and the lessee is the user of the equipment. There are two broad categories of
lease – the finance lease and the operating lease.
Finance lease
The finance lease is normally arranged through leasing companies who have no particular
interest in the equipment and offer no technical support, but merely arrange the lease. The
lessee pays the lessor payments or rentals for the use of the equipment acquired. The
Equipment profitability and aquisition 107
capital allowances the leasing company may have passed on when calculating the lease
payment.
Another feature of finance leases is that the security of the lease may well be only the
asset itself and the rest of the organisation’s borrowings against the organisation’s owned
assets may not be affected by a leasing arrangement. Therefore, an organisation that is
already ‘highly geared’, that is, has high borrowings in relation to equity or shareholders’
capital, may find leasing attractive. Although the leased asset may not show on the
balance sheet, the business has nevertheless committed itself to payments and in practical
terms is just as vulnerable as if it had increased its borrowings.
Thus, a finance lease is likely to be more advantageous to an organisation when its
profit flows do not generate the full benefit of capital allowances for purchasing and/or
when the business cash flow situation is unable to provide funds for purchase, or when
the organisation is unable to undertake further borrowings to purchase equipment.
Operating lease
The operating lease is normally arranged with manufacturers or suppliers who offer such
a service as part of the marketing of their products. Again such leases are likely to have a
non-cancellable primary period, but the duration and costs may be quite different from
those of finance leases because the leasing company, being the manufacturer, has a
different interest in the equipment. For example, the supplying organisation may have use
for the equipment itself or a well-developed second hand leasing market. In these
circumstances an operating lease may be cheaper than a finance lease. The capital
allowances would, as with finance leases, go to the leasing company who own the
equipment.
Hiring
Hiring and leasing are sometimes regarded as similar and for equipment items that are on
hire for long periods the difference between the two methods of acquisition may be
unclear. An example of such a long-term hire is the contract hire arrangements for
vehicles. The payments are similar to those in leases, and the owner of the vehicle – the
hire company – claims the capital allowances. However, contract hire arrangements can
involve the hire company supplying the vehicles in providing repair and maintenance,
whereas finance leases do not involve the leasing company in providing these services.
Thus, there are distinctions. Short-term hire of equipment is not usually regarded as
leasing, and the organisation hiring the equipment pays an hourly, weekly or monthly rate
for the equipment. The period of hire may well be as short as one week or one month and
therefore the organisation is not committed to a long primary period, as it would be in a
finance lease. The use of such short-term hire is, of course, widespread in the off-
highway plant and equipment industry, and within the industry there exists a very well-
developed equipment hire industry to serve this market. Many organisations who own
their own equipment run the equipment division as a subsidiary offering external hire to
other organisation and internal hire to their own organisation, which may be the parent
company or another company within the same holding group. Thus, the companies,
themselves are the users of the equipment, are well used to hiring either internally or
Equipment profitability and aquisition 109
The key to deciding whether leasing is more advantageous than purchasing in cost terms
is the use organisations can make of the capital allowances. For example, ignoring tax
considerations, if the purchase price of an item of equipment were £12,000 and the lease
payments were £1,450 per quarter for three years, the cost of these two cash flows could
be compared on present worth terms, using an interest rate that represented the value of
money to the organisation. Table 6.16 illustrates this, using an interest rate of 15 per cent.
Note: The factor 9.63496 is the present worth factor for a uniform series calculated as
where n is the number of periods, 12, and i is the interest rate per quarter. The interest
rate per annum was given as 15 per cent. Thus, the interest rate per quarter is calculated,
using the compound relationship, as:
Management of off-highway plant and equipment 110
Thus, at an interest rate of 15 per cent the purchase alternative is cheaper. In fact, the
interest rate in this example would need to be 27.2 per cent per year or 6.2 per cent per
quarter before the leasing costs would just equal the purchase price. The situation is
influenced, however, when tax considerations are included.
Equipment profitability and aquisition 111
The leasing versus purchasing comparison is a financial appraisal and usually the
discount rate used in these comparisons represents the cost of borrowing. The cost of
borrowing is the nominal interest rate, less tax for the profitable business.
Table 6.17 shows the cash flows for outright purchase, using the 25 per cent written
down capital allowances immediately and assuming a tax lag of one year to represent the
delay in meeting a tax liability or, as in this case, recording a tax saving. The tax saving is
treated the same as an inward cash flow, since this has the same effect as a saving that
prevents an outward cash flow. The tax saving is calculated on a tax rate of 30 per cent.
The NPV at 15 per cent is −£9,880.62, as shown in Table 6.17.
Table 6.18 shows the net cash flows for the leasing alternative. No tax savings from
capital allowances are shown, as these would already be reflected in the lease payment
charged to the acquiring organisation. However, tax savings derived from the lease
payments are shown, as these are normal trading expenses and are deducted from revenue
before tax. A tax lag of one year is assumed before the tax reductions are included. The
tax rate is 30 per cent. The NPV calculated at 15 per cent is −£10,516.11.
Thus, as with the case of Table 6.16, which ignores tax considerations, when tax
considerations are included and the capital allowances available in outright purchase are
used immediately, the outright purchase option is cheaper than the lease option, as the net
present values of −£9,880.62 for outright purchase and −£10,516.11 for leasing
illustrates.
However, the situation changes if there is a delay in taking the tax savings from the
capital allowances created by the purchase.
Table 6.19 calculates the NPV for a delay to year two before taking the tax savings.
This delay could be caused by profit flows being insufficient to use the capital allowances
immediately.
With a delay to year two before the tax savings become effective, the difference
between purchasing and leasing narrows, and the NPV of leasing remains at −£10,516.11,
whereas the NPV of purchasing becomes −£10,176.65.
Any further delay in taking the tax savings will make leasing a cheaper alternative, as
Table 6.20 illustrates by adding a further year delay before taking the tax saving.
Thus, with a delay to year 3 before the tax savings become effective, the leasing
option becomes more economic as the NPV of purchasing becomes −£10,381.92,
whereas the NPV of leasing remains at −£10,516.11.
Table 6.18 Net cash flow for the leasing alternative
including tax considerations
Year Quarter Period Lease Tax Present Present worth
payment (£) reduction worth of tax
(£) factors reduction (£)
(15%)
1 1 −1,450
2 2 −1,450
1
3 3 −1,450
4 4 −1,450
Management of off-highway plant and equipment 112
1 5 −1,450
2 6 −1,450
2
3 7 −1,450
4 8 −1,450 +1,740 0.75614 +1,315.68
1 9 −1,450
2 10 −1,4503
3
3 11 −1,450
4 12 −1,450 +1,740 0.65751 +1,144.06
4 4 16 +1,740 0.57175 +994.84
The tax reduction is calculated as 30% of a year’s
lease payments and delayed 1 year
(4×£1,450.00×30%).
Present value of tax reductions +£3,454.58
Present value of lease payments, from Table 6.16 −£13,970.69
NPV −£10,516.11
A final illustration shows the capital allowances spread over years 2 and 3 to represent
the ability to take some tax savings in year 2 and the remainder in year 3. This is shown
in Table 6.21. Again this illustrates that delays in taking the tax savings can lead to the
leasing option becoming more economic, as the NPV for outright purchase is
−£10,260.57, while the NPV for leasing is −£10,516.11.
In all the lease versus purchase examples shown above, a tax lag of one year was
adopted to represent the delay in meeting a tax liability. This one year lag could vary and
the lag itself influences this lease versus purchase comparison. However, the point is
made in these examples that any delay in using the capital allowances that are created by
purchasing shifts the balance of the economic comparison in favour of leasing. Thus, the
cost comparison between leasing and buying is determined by the organisation’s profit
flows.
The other factors to be considered are:
1 The organisation’s cash flow, since leasing makes fewer demands than purchasing.
2 The organisation’s ability to raise the capital to purchase, since this depends on the
extent of the organisation’s existing borrowings.
3 The availability of alternative uses for the investment funds available.
4 The loss of flexibility, due to commitments, to make lease payments annually.
5 The restrictions placed on the using organisation in using the equipment.
Thus, the resolution of the lease versus purchase issue is not simply an economic
comparison but involves these other factors as well.
Chapter 7
Selection of equipment and hire rate
calculation
Introduction
Technical evaluation
The purchase of an item of equipment requires a high capital outlay, and the
consequences of misjudging the potential earnings of the machine over a number of years
could have a dire effect on future profits. Thus, unless it can be shown that the equipment
will yield a rate of return at least as good as making an alternative investment, it should
not be purchased at all. In this event either leasing or hiring may be a more economical
option. However, even when the financial and other economic factors have been
adequately satisfied regarding the purchase, because of the many alternative choices of
manufacturer now available for many items of equipment, the final decision is likely to
be influenced by the merits of small but important differences offered with each make. It
is this aspect of the purchase, namely the technical evaluation that is dealt with first.
The decision process follows a systematic i.e. ‘value management’ approach originally
developed by US consultants Kepner and Tregoe. The method forces the manager into a
sequence of actions and helps to highlight the relevant factors. In this way the many
separate
Selection of equipment and hire rate calculation 115
Using this definition, Kepner and Tregoe established seven essential factors in decision
making (Figure 7.1).
Management of off-highway plant and equipment 116
A company has recently obtained a contract that will involve the use of a 40-tonne-
capacity, strut-boom, crawler-mounted crane. A nine-year working life can be assumed,
which indicates that an attractive rate of return may be achieved by purchasing the crane.
The crane must be capable of conversion to a dragline-grabbing excavator and cost less
than £41,000. Management is required to undertake a technical evaluation of the
alternative makes of crane available in the market.
Purpose of decision: evaluation of cranes for possible purchase and addition to
company fleet
Objectives Alternatives
Ref Musts Harris Go/No
46T
A Crawler mounted machine Yes
Yes Yes
Yes Yes
Information Rt Weighted score Information
£39, 482 10 100 £36, 534 HFC 416 P I P×I
Max 53.5T 10 100 Max 45T
Max 6T 8 56 As a result of design fault on the clutch
some down-time may be necessary to
effect a repair
10 70
No — — — No information £ £
information
10 40 40 0.9 300 270
Wylie 9 72 Wylie
66T 9 18 50T
9.50 psi 9 27 8.50 psi (ave)
(ave)
Dorman 7 49 Dorman diesel
diesel
3.00rpm 9 45 4.00rpm
140ft/min 9 54 156ft/min
0.818mph 10 40 0.907mph
10 40
Max grad I 9 45 max grad I in 4
in 4
9yrs–£3,000 10 80
10 40
10 50
348 This crane is removed from
the analysis as must C is
violated
618
966
The method
The problem as defined is far too vague to establish the precise requirements, and some
discussion with the project manager, plant manager, planning staff and preferably the
operator also is required. From these further enquiries the precise features of the machine
may be ascertained: these will be called the ‘objectives’, and examples are listed A–G, 1–
18 in Figure 7.2.
discounts and payment arrangements may influence the final decision. Also, the cost and
availability of spare parts and maintenance should not be overlooked at this stage,
especially from foreign suppliers affected by exchange rate fluctuations.
Table 7.1 reveals that the Sirac Highlift was not quoted with dragline equipment and
that, as it is a new model, it can only be used as a lift crane at present. Therefore,
although this machine slipped through the preliminary screening of the must objectives, it
is now marked no go against objective C in Figure 7.2 and is eliminated from further
consideration. The Harris and HFC cranes comply with all the must objectives and effort
can now be concentrated upon the want objectives of these two machines.
The want objectives are now separated into two groups, namely those that can be
evaluated from the manufacturer’s specification and those that cannot, as follows:
Can Cannot
1 Purchase price 4 Maintenance requirements
2 Safe working loads 5 Running costs
3 Dragline range 15 Manoeuvrability
6 Method of assembly 17 Assembly time
7 Safety features 18 Driver comfort
8 Weight of machine
9 Bearing pressure under tracks
10 Bearing
Selection of equipment and hire rate calculation 121
11 Slewing action
12 Hoist system
13 Travelling speed
For those wants which are not readily available from manufacturers’ information, more
subtle sources must be found. For example, site demonstrations, visits to the
manufacturer, records of data on experiences with similar machines, personal contacts
with other plant users and discussions with machine operators.
With sufficient information on all the wants objectives available, the two remaining
crane alternatives (namely Harris 46T and HFC 416) are compared for performance.
Each want objective is considered in turn and rated on a 1–10 scale. The technical
element and economic element ratings are separated in order that the importance of each
can be ascertained.
To obtain the relative worth of each want objective, the rating value is multiplied by
the previously given rank number. The resulting weighted score represents the
performance of the crane against its objective. The weighted scores for each objective are
subsequently added, to give totals for each crane alternative, and the totals for each
provide an indication of the relative position with respect to the specified objectives. In
this example the total weighted scores shown in Figure 7.2 are summarised as follows:
Percentage of total Harris HFC
Cost and service element (S) 39 291 348
Technical element (T) 61 607 618
100 898 966
Note: It must be emphasised that these values are determined largely by subjective
judgement, albeit based on careful analysis of the available facts, and as such do not
make the selection of the best alternative a routine procedure. However, the values do
make it possible to deal systematically with many factors which otherwise could not
easily be related for importance.
Step 6: Re-evaluate the decision and assess the adverse possibilities of that choice
When many alternatives are available, the weighted scores of one or two are sometimes
quite close, so, before the final decision is made, any adverse consequences must be
considered. The manager must look for snags, potential shortcomings or anything else
that could go wrong. The probability (P) of the adverse consequences should be assessed
and a seriousness weighting (I) given to its possible effect. An expression of the total
degree of threat may be obtained by multiplying the seriousness weighting by the
probability estimate.
In this example the plant and site managers arrange a meeting to discuss the
implications of the proposals, and the following points are raised.
(1) The discarded Sirac Highlift appeared to be a fairly good crane on preliminary
inspection and perhaps the must objective necessitating dragline conversion could have
been reduced to a major want objective. A further check on the records reveals that only
20 per cent of the time was spent on such duties. Thus, unless the plant manager insists
that this facility is essential, this crane should be reconsidered. But the must objective
should only be waived in very exceptional circumstances.
(2) Possible adverse consequences of choosing the Harris 46T, such as the effects of a
strike at the factory, can be assessed from past experience. It may be that on the past 10
occasions when a new wage agreement has been under negotiation between the Harris
company and its workforce, a strike resulted on three occasions. So the probability (P) of
a strike at this time is judged to be 30 per cent. If a strike did occur which would last
more than a few weeks, then the delivery of this machine would exceed the specified time
on the order, in which case the crane should not be considered at all. However, should a
strike occur lasting four weeks, the cost of hiring a crane would be about £300 per week;
therefore, the degree of threat is (4×300)×0.3=£360.
(3) One possible adverse consequence of the HFC 416 has come to light. A serious
accident has just revealed a major design fault in the clutch mechanism of the winch. A
temporary modification will be made to all existing models and stocks held. But a
completely new part is not available for six months and will require taking the crane out
of service for one week at that time. The probability that this service is required is 90 per
cent and the cost of hire for another crane is £300 per week, thereby directly increasing
the contract cost at this rate. The degree of threat is (1×300)×0.9=£270. The choice,
therefore, is still the HFC 416. Had the consequences been reversed, a much closer
examination of the advantages and disadvantages would be necessary, making the
decision much more difficult.
Step 7: Set up contingency plans to control the effects of the final decision
The adverse consequences represent potential problems, and they must be prevented from
causing too much inconvenience. This is done either by taking preventative action to
remove the cause or by deciding upon a contingency action if the potential problem
occurs. In our case, the simple remedy is to ensure that alternative machines are available
for hire at suitable times or to arrange work on site so that interruption is minimal.
Selection of equipment and hire rate calculation 123
Comments
A decision has been reached to buy the HFC 416, and this is the best choice on the basis
of the judgement of the plant manager concerned. For someone else with different
experience, the assessment of the objectives might be quite different and would possibly
produce a different result. But even accepting this obvious weakness, the method at least
forces the manager to consider most of the facts. It provides a record of the thought
processes and will help to sort out points of confusion, for it is almost impossible to
memorise all the facts and relationships, except for the very simple choices. In such cases
the decision process can be adequately carried out mentally without the need for the
elaborate method described. Finally, the decision process is written down on paper and is
available for all to see.
The whole procedure can now be readily performed on a personal computer, using
commercial spreadsheet and database packages. Indeed, equipment manufacturers
themselves may eventually offer comprehensive information such as machine
specifications, performance characteristics, prices, etc., on computer discs, which would
considerably assist the analysis process.
Once the equipment has been selected and purchased then revenues from hiring
out/renting to the open market or obtained solely from internal usage, should not only
recover the owning and operating costs, but also aim to achieve expected profitability.
Ownership costs are fixed costs arising indirectly, such as business overheads. They
are incurred throughout the period of ownership and are a fixed charge. They include:
• cost of capital;
• depreciation on the equipment;
• insurances and licences;
• corporation tax and capital allowances;
• establishment charges.
The operating costs are direct costs of material, labour and expenses, which vary
according to the usage of the machine, and include:
• servicing costs – for example, oil, grease and other consumables;
• maintenance costs;
• transport charges;
• fuel;
• operators’ wages.
Management of off-highway plant and equipment 124
Cost of capital
Depreciation
Most items of equipment wear out and deteriorate with usage or become obsolete with
time. Thus, at the end of its economic life sufficient revenues should have been generated
to cancel out the capital part of a loan or to replace the machine when internal funds are
used. In calculating depreciation, it is necessary to estimate the resale or scrap value of
the machine and the useful life. Estimation of the useful life is mostly done by intuition
based on experience of operating a similar item. For example, when the utilisation level
shows a clear downward trend accompanied by increased maintenance costs and loss of
profit, the machine has probably reached the end of its useful life for the organisation.
There are several methods of calculating the annual depreciation charge, but the
choice will depend largely upon the type of machine and its operation. In principle,
depreciation is deducted from profits (since it represents a cost on the business activities)
before tax is paid. It is, therefore, necessary to obtain approval of the method and
depreciation period from the Inspector of Taxes before a suitable policy can be adopted.
However, where capital allowances are in operation special arrangements generally apply
(see Chapters 6 and 16).
where Dp/a is the depreciation per annum; C is the purchase price of the asset; S is the
salvage (residual) value of the asset at the end of its useful life; and N is the life
expectancy of the asset (in years). This method is, however, misleading because most
plant items tend to lose value more rapidly in their early life, followed by a slower rate of
depreciation thereafter (Edwards et al., 1998).
Selection of equipment and hire rate calculation 125
Example 7.2
The total depreciation is £40,000, the annual depreciation is £4,000. The hourly
depreciation will therefore be £4,000÷2,000 (hours operation p/a)=£2.
where S is the salvage value, C is the purchase price, N is the life of asset and d is the
percentage depreciation.
Figure 7.3 demonstrates the main features of the declining balance method and the
straight line method.
The declining balance method of depreciation is more representative of a real life
scenario since it allocates larger charges of depreciation early in the life of plant. These
charges
Table 7.2 Declining balance depreciation example
(at 26.2%)
End of year Depreciation (£) Depreciation for year (£) Book value (£)
0 26.2 0 42,000
1 26.2 11,004 30,996
2 26.2 8,121 22,875
3 26.2 5,994 16,881
4 26.2 4,423 12,458
5 26.2 3,264 9,194
Management of off-highway plant and equipment 126
Free depreciation
The asset is totally depreciated initially by this method. For example, the item of
equipment purchased for £42,000 would be depreciated by £40,000 immediately on
acquisition, leaving only the £2,000 salvage value.
The costs for vehicle excise, driver and goods operator licences largely depend upon the
type of vehicle/equipment and whether the equipment is to be used on the public roads or
otherwise. Acquisition of appropriate insurance is also necessary to cover risks to third
parties, adjacent property and public utilities. These aspects are fully discussed in Chapter
8.
Establishment charges
The owner needs to recover the cost of overheads in the hire rate, that is, the central
organisation, including the offices, workshops and associated administrative facilities.
These fixed costs are commonly apportioned on the basis of budgeted annual operating
hours of the item or as a percentage of the purchase price of the machine per annum.
Operating costs
Operating costs are (as their title implies) directly attributed to the cost of operating the
machine and include maintenance, consumables and operator wages. Without such
expenditure the many benefits of mechanisation could not be realised.
Maintenance
Equipment requires periodic maintenance to keep it in working order, and facilities are
required to provide both a fixed-time-to and a breakdown maintenance service. The
Selection of equipment and hire rate calculation 129
budgeted costs of maintenance to include in hire rate calculations should be derived from
records of the operating costs incurred by the plant workshop. Indeed, the workshop itself
should operate a cost control system for each item of plant, to record the expenditure on
spares, maintenance, etc. The costs of maintenance are variable and ought therefore to be
included in the hire rate as a direct cost per hour operated. In practice, however, many
owners prefer to express the costs of maintenance in the hire rate as a percentage of the
purchase price of the machine.
Consumables
Consumables include oil and grease, tyres and fuel, and are direct costs which vary
according to the condition of the machine, work done and hours operated. The cost of
greases and lubricants incur in two instances. First, they are used during operator
maintenance undertaken on a daily basis. Second, larger quantities of oils are consumed
during periodic changes at those intervals either recommended by the plant manufacturer
or as indicated by a reputable supplier of lubricants. It will be readily appreciated that
there will be a great deal of variation in oil usage, according to: machine type; operating
hours per week; machine age; and operating conditions.
Consumable costs are infamously difficult to estimate and will vary depending upon
the region of purchase, allowable discount and quantity purchased. Accurate costs can
however be accrued from records of operating similar equipment in the past. In the
absence of such data, manufacturers provide guidelines on the consumption of these
materials, but care should be exercised, as the data are likely to relate to new equipment
operating under ideal conditions. The inclusion or otherwise of the cost of fuel in the hire
rate will, of course, depend upon the hire contract conditions.
Operators’ wages
The operators’ wages relates to the direct cost of employing a competent person(s) to
operate plant items. The actual gross wage paid to the operator is dynamic as it contains
so many variables, a combination of which could lead to infinite possibilities. Broadly
speaking, a composite rate would be built up of the following constituent parts: overtime,
bonus, travelling subsistence, national insurance premiums, holiday pay, sick pay,
pensions, etc. Operator wages are not usually included in the hire rate since many items
are hired exclusive of the operator. But, when required, costs based on the driver’s hourly
rate must be recovered; when this occurs careful consideration should be given to
developing an appropriate composite rate. The rate should be high enough to attract the
best candidate but not too high as this would negatively impact upon competitiveness.
These are treated more fully in Chapters 6 and 16 but, briefly, depending upon national
policy, governments sometimes introduce investment incentives to encourage businesses
to account for free depreciation on equipment, so that an item is allowed the full purchase
price to be deducted from profits in the year of purchase, and thereby the amount of
Management of off-highway plant and equipment 130
corporation tax due is reduced in that year. The tax, however, will, of course, be
recovered in full from profits in subsequent years, since there is no allowance to set aside
thereafter. The effect of this arrangement is to alter the sequence of cash flows for the
business, which may produce a more favourable return on capital employed and so
encourage other investment.
The effect of capital allowances, when introduced by government, is aimed at
encouraging firms to purchase new equipment and boost economic performance. If used
to excess such a policy has the potential to cause the market to become oversupplied with
plant resulting in hire rates falling below levels which can earn a healthy rate of return on
capital employed. Thus, although over the short-term customers and both home and
overseas manufacturers benefit, ultimately low profitability cannot be sustained
indefinitely and considerable adjustment becomes unavoidable either through bankruptcy
or mergers.
It is emphasised that capital allowances are basically a feature of the profit and loss
account for the whole enterprise for the calculation of corporation tax payments. Clearly,
to allow full initial depreciation in the hire rate would be non-sensical, as the rate would
be uncompetitive during that year thus, for such purposes internal depreciation should be
based on a realistic assessment of the life of the asset.
There are several acceptable methods of calculating an economic hire rate with the
favoured approach requiring calculation of ownership and operating costs plus a
contribution for profit. However, a more satisfactory method for investment extending
over a few years is the discounted cash flow (DCF) yield, which takes into account the
timing of cash flows.
Maintenance 10% of
capital cost
Consumables £400 per year
Overheads of business £2 per hour
Required rate of return on investment 15% per year
Budgeted operating time 2,000 hour
per year
Transport charges say £100
Item £ per year
4,200
Interest on finance, calculated using a capital recovery factor from interest tables 4,554
(CRF=0.199 at 15% p.a. for 10 years):
The cost of transport and any additional profit should be added to this figure. Finally, the
hire rate is based upon a utilisation period of 2,000h, and should this target not be
reached, the ownership (fixed) costs will be under recovered and budgeted profit will not
be achieved.
To return 15 per cent on the investment over 10 years, the total cash flows reduced to net
present worth at time zero must equate to:
It can be seen that the DCF method automatically accounts for the depreciation over the
life of the asset.
Example 7.4
Depreciation is the most vulnerable element in the hire rate calculation, because other
items are the result of obvious cost movements, that is, materials, wages, interest rates.
The hire rate should therefore be revised frequently, to keep up with inflation. In fact, it
may even be necessary to provide for ‘backlog’ depreciation to allow for the period prior
to an underestimated price rise. Assessments can be made from special price indices for
construction plant, or, alternatively, the small operator replacement prices should be
obtained from plant dealers and manufacturers. Inflation produces other severe effects by
causing trading profits to be overstated. As a result corporation tax is paid on the inflated
rather than the real profit.
Example 7.5
Inflation is 10 per cent per annum over 10 years. The purchase price is £46,000 and the
historical resale value is £4,000 (refer to Table 7.7). The depreciation in, say, the first
year of inflation is £4,620.
Interest on finance
With inflation at 10 per cent the apparent rate of return must be used in the calculations:
Management of off-highway plant and equipment 134
where ia is the apparent rate of return, ir the real rate of return; id the rate of inflation.
Therefore,
Thus, interest on finance, using a capital recovery factor of 26.5 per cent from interest
tables,
Other items
Fixed overhead £4,000
Road tax and licences £100
Insurance premium £200
Consumables £400
Maintenance £4,600
£9,300
If inflation continued as shown by the indices, the hire rate for year five should be given
by:
It can be seen that during periods of inflation the hire rate should be revised at least
annually. When inflation exceeds about 10 per cent, the revision may need to be at
quarterly intervals, depending upon the demands for payment by suppliers of materials,
etc. However, this is not always possible when the market for hired equipment is slack
and competitors are willing to undercut hire rates.
When inflation exceeds the net rate of interest on borrowed capital (i.e. interest on
borrowings is deducted from company profits before corporation tax is paid, which in
effect produces a lower rate of interest), a three year replacement cycle for plant is best.
Below that rate of inflation a longer cycle is preferable. The cross-over point in the
choice of the method of financing is when inflation is equal to the net of tax interest rate
on capital. Below this rate of inflation self-finance is more attractive than borrowed
money, and vice versa.
Small businesses
The small enterprise commonly sets the hire rate in accordance with the market levels,
often guided by the figures published regularly by the Hire Association Europe, Scottish
Plant Owners Association, Construction Plant-hire Association, etc.
Indeed, most users are well aware of the prevailing market rate for a machine and each
hire is generally negotiated at around this figure. The experienced hirer is usually well
informed by the availability of machines locally and thus able to negotiate very
competitively. The minimum hire rate, especially for the owner–operator, often relates to
payments needed for repayment of the loan on the piece of equipment plus a sum to cover
running costs and the operators’ overheads, the latter being perhaps as minimal as
providing the owner’s salary.
Management of off-highway plant and equipment 136
Medium-to-large companies
Large companies with comprehensive central and regional plant depots carry out detailed
analyses of the economics of owning and operating equipment. The hire rates are usually
based on collected cost data of the firm’s operations and calculated by the principles
established above, including DCF techniques.
When the volume of work fluctuates markedly, and particularly with declining demand,
many owners of equipment try to cut back the size of their fleets in order to survive. In
such a situation a previous good maintenance strategy may assist in temporarily
sustaining acceptable resale values. Nevertheless an oversupplied market ultimately
forces firms to attempt hiring out plant at unrealistic rates, perhaps abetted by
manufacturers offering generous cash discounts on new purchases to hold on to market
share. As a consequence, machines get ‘run into the ground’ as the rates of hire are
insufficient to cover adequate maintenance and servicing. Some restructuring of the
market then inevitably becomes unavoidable.
Part III
Operational management
Chapter 8
Insurance and licensing legalities
Insurance
Off-highway plant and equipment organisations and equipment hire companies require a
variety of insurance policies and cover. This is due to the different legal and contractual
requirements for insurance and the diversity of policies, from those to cover liability to
those concerning material damage. In this chapter the main areas of insurance cover
pertinent to the off-highway plant and equipment will be discussed.
Compulsory insurance
Insurance cover may be a legal requirement and therefore compulsory. Examples of
compulsory insurance are the insurance of vehicles as required by the Road Traffic Act,
the insurance against claims from employees as required by the Employers’ Liability Act
and the insurance against claims from the public as required by the Finance Act.
Contractual agreement
Insurance may be required by a contractual arrangement entered into by the organisation
and other party. Examples of insurances required by contractual agreements are the
responsibilities of contractors under ICE Conditions of Contract or the JCT Standard
Form of Building Contract and the insurance required by certain hiring agreements
between equipment hire companies and the hirer.
Risk minimisation
Although it may not be a requirement placed on the organisation either by law or by
contract, insurance cover may be a wise precautionary measure to take to minimise risks.
The Road Traffic Act only requires a specified minimum insurance cover, but the owner
of a vehicle may insure it comprehensively, to reduce risk and ensure adequate
compensation in the event of loss or accidental damage. Insurance of buildings and
insurance of contents are other examples. Some hire agreements between equipment
companies and contractors do not specify insurance but place the responsibility for loss
or damage of the equipment with the hirer. In such cases insurance is not a contractual
requirement but is clearly a sensible precaution.
Management of off-highway plant and equipment 140
Classes of insurance
There are four broad classes of insurance available.
1 Liability insurances. As far as equipment organisations are concerned the main types
are:
• employers’ liability;
• public liability;
• motor insurance, third party;
• liability under contract, such as ICE Conditions of Contract or JCT Standard Form of
Contract.
2 Material damage insurance which covers such items as:
• insurance of works which may be specified in the contract between the employer
(i.e. the promoter of the works) and the contractor;
• insurance of buildings and contents;
• insurance of plant and equipment;
• engineering insurance;
• motor insurance covering accidental damage.
3 Pecuniary insurances which cover fidelity risks, credit risks and consequential loss.
4 Benefit insurance which covers personal accident.
engineering policy, which is dealt with in the next section, or as part of a commercial
vehicle policy, if the equipment is mechanically propelled.
An organisation’s equipment policy would be a material damage policy and would
cover loss or damage while insured. The same cover could be obtained in a contractors’
all-risk policy which also includes the travelling of equipment to and from the site. An
engineering policy would normally be taken to protect against breakdown and as a means
of acquiring an inspection service by a competent person, but the policy may sometimes
be extended to cover loss or damage. Mechanically propelled equipment such as
dumpers, excavators, graders, etc., may be insured within an organisation’s commercial
vehicle policy.
In hire agreements between equipment hire companies (the owner) and the hirer, the
responsibility for loss or damage of the hired equipment normally rests with the hirer.
The hirer may be responsible for lost revenue after the hire period has expired while the
equipment is being repaired or replaced. The hirer may not necessarily be required to
insure the equipment but will carry the risk if none is taken out. The Contractors’ Plant
Association Conditions of Hiring Plant are an example whereby the hirer is required to
make good to the owner all loss of or damage to the equipment from whatever cause, and
in these circumstances the hirer would be well advised to insure against such claims from
the owner. This insurance may be included under the policies described above.
Special vehicles
Special vehicles can be insured under a commercial motor vehicle policy. Such vehicles
or items of equipment can be grouped as follows: digging machines; site clearing and
levelling equipment; mobile cranes; mobile equipment – for example, compressors,
welding and spraying equipment – dumpers and road rollers.
A goods carrying vehicle fitted with lifting equipment for the purposes of loading
goods onto itself is treated as a goods carrying vehicle for insurance purposes. With
respect to mobile cranes, the crane itself requires inspection services that are included in
an engineering policy. An engineering policy would also provide for breakdown,
accidental damage and third party liability, but excludes the liability protection required
by the Road Traffic Act. Thus, there is a need for both motor insurance and an
engineering insurance on, for example, a mobile crane, and there may be a risk of
duplication if the insurance cover is not carefully arranged.
If the mobile crane is hired out, the motor insurance cover can be extended to include
use while on hire. Dumpers can be included in a motor insurance policy and the cover
can be extended to include use by a hirer. Mobile equipment such as excavators and
shovels can be insured as part of a motor insurance policy and can include damage to the
insured’s own equipment. The cover can also be extended to the hirer. Protection against
third party liabilities can be included, but the third party risk other than those arising
under the Road Traffic Act may be covered better by a public liability policy.
Management of off-highway plant and equipment 144
Site clearing and levelling equipment is grouped separately from mobile equipment, as
this class of equipment cannot excavate below the level of the wheel base. Third party
risks to property in the ground, such as water, drainage and other services, are much
reduced and therefore attract different premiums.
Contingent liability
A motor contingent liability policy is a policy that protects the insured against liability to
third parties resulting from the use of vehicles on behalf of the insured, over which the
insured does not have immediate control.
As an example, suppose that an equipment hire company believes that the hirer’s
insurance has been extended to indemnify the owner but that the policy, by oversight, has
not been extended, or has lapsed. A contingent liability policy would indemnify the
owner in these circumstances. Similarly, a hirer may believe that the owner’s motor
policy extends its protection to the hirer, but if the owner’s policy has lapsed, or is not
extended to cover the particular circumstances, then the contingent liability policy could
provide protection. This policy is important, because, under hire agreements based on the
Contractors’ Plant Association Conditions, it is the hirer who is responsible for third
party liabilities such as injury or property damage caused by the plant. Thus, the hirer
would bear the costs of such claims if the hire company’s policy failed to operate.
Licensing
The use of public roads within the UK is controlled by extensive legislation, broadly
called the Road Transport Laws, which control the construction and use of vehicles on
the public roads. Within this legislation is a system of licensing which controls the use of
vehicles and their drivers on the public roads and collects taxes. This is of relevance to
off-highway plant and equipment organisations because some plant items (most notably
telehandlers and wheeled backhoe loaders) travel both on and off the highway, generally
from one site to another or to deliver materials or parts over short distances. The three
main licensing systems of interest are as follows:
1 Vehicle excise licensing, which requires a licence, for which duty is payable, to be in
force for all vehicles used on the public roads, unless exempted.
2 Driver’s licensing, which requires every driver of a motor vehicle to hold a driving
licence. A prescribed driving test is taken before a driving licence is issued.
3 Operator’s licensing, a system of goods vehicle licensing which exercises control over
operators to ensure the proper use and roadworthiness of the vehicles and observance
of the drivers’ hours law.
In addition to these three licensing systems, there is public service vehicle licensing,
which controls vehicles, operators and drivers of passenger carrying vehicles, such as
buses and taxis.
General requirements
A person who uses or keeps on a public road any mechanically propelled vehicle must
have an excise licence in force, unless exempted. Excise licences are issued from local
vehicle licensing offices and can also be renewed from post offices. A vehicle excise
licence can be taken out for 6 or 12 months. Applications for a licence or its renewal must
be accompanied by a certificate of insurance and a test certificate if the vehicle is subject
to a test procedure. The annual duty for vehicles varies according to the class of vehicle.
Exemptions
Certain vehicles are exempt from paying duty. Exemptions of particular interest include:
1 road construction vehicles used on a road to carry built-in road construction machinery;
2 a vehicle which is to be used exclusively on roads not repairable at the public expense
but details of the vehicle must be declared to the licensing authority;
3 subject to approval, a vehicle which uses public roads only for passing from land in the
owner’s occupation to other land also in the owner’s occupation for distances not
exceeding six miles in any week.
Management of off-highway plant and equipment 146
Mobile plant
Vehicles carrying no load other than built-in plant or machinery are taxed as goods
vehicles. The weight of the built-in plant or machinery is deducted from the total weight
in calculating the unladen weight of the vehicle for the purposes of assessing the duty
payable.
Driver licensing
No person may drive or permit another person to drive a motor vehicle on a road unless
that person holds a driving licence granted under the conditions of the Road Traffic Act.
The minimum age for drivers’ licences is 16–21, depending on the class of vehicle. In
the UK the minimum age is 17 for an agricultural tractor; for a medium-sized goods
vehicle the minimum age is 18; and for larger vehicles it is 21. The minimum age for a
goods vehicle not exceeding 7.5 metric tonnes is 18 within the EU and 21 for heavier
vehicles, although this can be reduced for drivers who have attended goods vehicle
training courses and hold certificates of competence. The driver must pass a driving test,
conducted by examiners appointed by the Licensing Authority, to obtain a driving
licence.
Operators’ licensing
General requirements
The Operators’ Licensing system is a system of goods vehicle licensing introduced by the
Transport Acts and the Road Traffic Act or EU Directives. All goods vehicles exceeding
3.5 tonnes gross plated weight need to be covered by an operator’s licence. Exemptions
from an operator’s licence include the following:
1 agricultural machinery and trailers;
2 dual-purpose vehicles and trailers;
3 vehicles and new trailers using the road for less than six miles per week while moving
between private premises;
4 passenger-carrying vehicles and trailers;
5 a trailer incidentally used in construction;
6 road rollers and trailers;
7 vehicles with special fixed equipment;
8 local authority special vehicles for road cleaning and gritting;
9 vehicles used for weighing vehicles or maintaining weighbridges;
10 water, electricity, gas or telephone emergency vehicles.
Vehicles which must be used under an operator’s licence include all goods vehicles
belonging to the licence holder or in possession by virtue of a hire purchase agreement,
hire or loan – that is, all vehicles used by the licence holder, not simply owned by the
holder. An operator’s licence is required for each operating centre – that is, yard or base
for vehicles, in different Traffic Areas controlled by Licensing Authorities. Only one
licence is required per Traffic Area, irrespective of the number of operating centres in the
Traffic Area.
An application for an operator’s licence is made to the Licensing Authority.
Application may be made for additional vehicles not yet acquired and, if authorised, this
simplifies the procedures of adding additional vehicles to the operator’s fleet. The
information the Licensing Authority will require includes:
1 the use to which the vehicle will be put;
2 arrangements for ensuring that drivers keep within permitted hours of work and keep
proper records;
3 vehicle maintenance facilities;
4 details of any past activities in operating vehicles for trade purposes by the applicant(s);
5 convictions relating to operating vehicles during the preceding five years by the
applicant(s);
6 financial resources of the applicant(s);
7 the names of company directors and officers of the applicant company and any parent
company or the names of any partners in a partnership.
The Licensing Authority, in deciding whether to grant a licence, will consider:
Management of off-highway plant and equipment 148
1 whether the operator is a fit person to hold a licence, bearing in mind past convictions
relating to the roadworthiness of the operator’s vehicles;
2 arrangements for ensuring that the law relating to drivers’ hours and records will be
complied with;
3 facilities for satisfactory maintenance;
4 arrangements for checking that vehicles are not overloaded;
5 the suitability of the proposed operating centre;
6 the financial resources for the proper operation of the business;
7 the professional competence of the operator or the operator’s manager.
In deciding whether to grant a licence, the Licensing Authority may hold a public enquiry
or take objections from a specified group of interested parties, including the police, the
local authorities, certain trade associations and certain trade unions. A licence would
normally be granted for five years, and additional vehicles may be applied for at the time
of licence application or individually when acquired. Arrangements also exist for
permanent one-for-one substitution of vehicles.
The Licensing Authority has disciplinary powers to curtail or revoke the licence if a
material change in circumstances occurs, or for certain offences relating to
roadworthiness of vehicles, drivers’ hours and records or plating and testing.
An annual fee is charged for each vehicle specified on the licence and a separate
identity disc is issued for each vehicle on payment of the fee. The disc must be displayed
on the windscreen of the vehicle.
Maintenance
An applicant for an operator’s licence must satisfy the Licensing Authority that the
maintenance facilities are such that the vehicles are kept in a safe and roadworthy
condition at all times. Licensing Authorities expect more than the minimum routine
maintenance specified by the manufacturers and more than the daily running checks
made by drivers: they look for a convincing system of inspection and fixed-time-to
maintenance. A satisfactory fixed-time-to maintenance inspection system requires:
1 competent staff capable of recognising the significance of defects;
2 a system of recording inspections, detailing what was inspected and the action taken,
such as the remedial work done and who undertook the remedial work;
3 adequate facilities for such inspections, including means of under-vehicle inspection;
4 a schedule of inspections the frequency of which is chosen to match the workload and
work type of the vehicles;
5 a drivers’ reporting system whereby the driver can report vehicle defects.
The Licensing Authority requires that maintenance reports be kept for a minimum of 15
months. Even if operators contract out inspections and maintenance to service companies,
they remain the users of the vehicle and are held responsible to the Licensing Authority
for the condition of their vehicles.
Insurance and licensing legalities 149
Drivers’ hours
Drivers of goods vehicles are generally subject to EU hours law, controlled by EU
Regulation, but there are numerous exemptions.
Drivers’ records
EU Regulation requires a tachograph to be fitted and used for goods vehicles registered in
a member state. The driver is responsible for returning the tachograph record sheets to the
employer and producing records for the current week plus the last day of the previous
week.
When tachographs are used, the keeping of a record book is not required. If a
tachograph is not in use, a driver must be issued with a record book for the purpose of
recording the daily and weekly working records, which are returned to the employer.
Introduction
Off-highway plant and equipment must operate efficiently and with minimum
unscheduled stoppages, if desirable levels of productivity are to be achieved. Realising
this objective will cost the organisation in terms of maintenance works required to sustain
production. However, ensuring maximum plant reliability can only be achieved via a
carefully planned maintenance strategy. The strategy must coincide with production
requirements and schedules so that it causes minimum stoppage and loss of production. It
should therefore consider the overall business situation and not only embrace pure
maintenance practice but also the wider economic ‘cost implications’ in the context of the
organisation’s broader portfolio. The maintenance programme will normally be bespoke
and subject to continual monitoring and improvement and will be based upon both
practice and experience. Once the maintenance framework has been developed,
management must ensure that works conducted conform to policy. The organisation is
not selling plant maintenance. Rather plant maintenance is required for its contribution to
the overall function of the business.
In today’s competitive market environment, many organisations have sold their plant
holdings in favour of hiring in plant requirements. It may seem therefore, that such an
organisation does not need to be concerned with plant maintenance. However, this view
is questionable for two reasons.
supply their own trained plant operators) for a forthcoming civil engineering project.
Under pressure to keep costs as low as possible, the quantity surveyor announces that the
company with the lowest tender bid wins the contract. Unknown to the quantity surveyor,
the plant hire company has attained a low tender bid partly through cuts to plant
maintenance. Consequently, the plant has a high breakdown frequency which results in
lost production for the contractor. The solution to this problem would be to draw up a
selective list of reputable plant hire contractors rather than operate an open tender
process. Ultimately, a select list will consist of those plant hire companies who maintain
their equipment regularly which is reflected in a higher hire cost per hour. This may seem
illogical but the benefit here lies in the fact that the higher rate will be offset by the
savings made through optimum utilisation. One cannot underestimate the massive
disruption that plant breakdown can cause to site productivity. This concept is difficult to
comprehend from the client’s viewpoint but when considered in terms of, for example,
project overrun on time and subsequent loss of revenue, then the need for reliable plant
becomes understandable.
Hired or owned, breakdown of a plant item may not cause any immediate financial
loss to an organisation directly. However, repeated breakdown will almost certainly result
in: delay to contract; possible loss of client goodwill; and loss of company reputation.
Combined, these in-turn influence future business. Whilst it would be difficult to assign a
cash value to future contracts, one can imagine that lost earnings could potentially be
huge.
Maintenance strategies
Maintenance can be defined as ‘that which either, retains mechanical plant and
equipment in a safe operationally efficient condition; or where plant items have broken
down, restores them to safe operational status’ (Edwards et al., 1998). By its nature,
maintenance involves delays, standing time and lost production. The principal aim of a
maintenance department, therefore, is to provide an effective service which attains high
availability of plant at the lowest achievable cost. Where possible, costly downtime
should be avoided through periodic servicing. Servicing seeks to retain plant in an
available state by preventing faults from occurring.
Advanced manufacturing organisations have for a long time recognised the high costs
associated with plant and equipment breakdown, typically including inspection, repair
and equipment downtime. Breaches of health and safety can also incur financial costs
should breakdown cause injury. In their search for improvements to maintenance
practice, plant managers within manufacturing industries have developed various
strategies for determining when maintenance should be conducted (refer to Figure 9.1).
As a consequence of the increased performance of plant and equipment within
manufacturing companies, these maintenance practices have subsequently been adopted
by a large section of the off-highway plant and equipment industry. This chapter aims to
define these strategies and perhaps more importantly, identify their potential benefits.
Management of off-highway plant and equipment 152
Fixed-time-to maintenance
welding to the structural fabric of the equipment and welding to ground engagement
gear, for example, buckets.
4 Periodic overhaul: This involves replacement of major components on a time usage
basis. For example, a 200 tonne-plus tracked hydraulic excavator has inherent
guaranteed service life (by the plant manufacturer) on its components. For example,
the guaranteed service life of a slew pump is 7000h.
5 Record keeping: Recording the previous points is essential to ensure that stock and
financial control can be monitored and corrected appropriately. Good records also
ensure that the service engineer is reminded as to when the next service or component
replacement is required.
Advantages of FTTM
The ultimate aim of FTTM is to increase the availability of the plant item, thus increasing
production output and hence reducing unit costs of production. Merits of FTTM include:
1 decreased downtime and therefore, improved utilisation levels of equipment;
2 coordination of maintenance periods with site production requirements, therefore,
reducing lost production to a minimum;
3 advance knowledge of the demand for spare components, so parts can be obtained in
good time and stock maintained at adequate levels;
4 programmed regular work schedules for maintenance personnel, facilitating the
allocation of fitters and mechanics specifically where specialist skills and experience
are required;
5 enhanced awareness of the importance of maintenance to the well being of the business.
Disadvantages of FTTM
1 Major components are replaced on a time usage basis only and not on the condition of
the component. Consequently, parts which may be perfectly sound are discarded and
no account is taken of the remaining service life which can potentially be quite
lengthy. Because parts are replaced more frequently, the cost of maintenance rises
exponentially.
2 Whilst the technique guards against breakdown, it cannot predict it. Hence, when a
breakdown occurs costly maintenance ensues.
3 This is a very comprehensive service and can be operated only by those firms with
extensive holdings, where ‘downtime’ can be avoided by substituting other machines
and where workshop facilities are available.
Predictive maintenance
Various mechanical signs, conditions or other indications precede 99 per cent of all
mechanical failures. With this in mind, non-destructive techniques have been developed
to determine incipient failure. Indeed, equipment diagnostic techniques are vital to the
successful maintenance and operation of off-highway plant. Condition based predictive
Management of off-highway plant and equipment 154
maintenance (CBPM) is founded upon the principle that wear is responsible for
innumerable mechanical breakdowns and even where not directly responsible, some
element of the phenomena is usually present. Wear is a gradual process which affects
components at varying rates. The process will not normally cause sudden mechanical
failure, but rather, wear is preceded by changes in a machine’s sensible behaviour. CBPM
focuses on the examination of these wear processes on mechanical components and is
normally conducted by mechanical engineering experts (often plant manufacturers offer
such services to the plant owner). The specific conditions measured will vary dependant
upon machine type. However, most measurements provide quantitative data on some or
all of the following:
1 temperature – bearings, lubricating oil and electric motors;
2 vibration – rotating machinery such as pumps and compressors;
3 pressure – fluid distribution systems, for example, oil supply;
4 electric current – electric motors and pumps.
A useful analogy for understanding CBPM is to compare mechanical plant failure to
serious illness in the human body. For instance, the enhanced probability of a patient
making a full recovery following a sudden heart attack, requires the application of
immediate paramedic aid. This is analogous to emergency repair and maintenance being
performed on broken-down plant items. However, such reactive diagnosis may lead to
‘on the spot’ prescribed actions which may only prematurely postpone death. In the case
of plant and equipment, this would be equivalent to irreparable damage! The important
lesson here, is that by conducting regular health checks, the signs and symptoms of
incipient breakdown can be identified. CBPM can be further classified as being periodic,
continuous and statistical.
and medium particles (0.1–0.5mm and 10–50µm, respectively) tend to exit oil circulation
either via filtration or settlement. Conversely, small particles which are less prone to
settlement remain suspended within the system thus their measurement provides true
indication of machine condition.
Ferrography
Ferrography, as a technology, is particularly useful for measuring lubricant quality in one
of the most fundamental of all engineering mechanisms – the gear. Increasing
performance of today’s gears (and other components) compounds the need to monitor the
quality of lubricants, so as to ensure prolonged life and efficient running of machinery.
Measurement of wear particles using ferrographic techniques is made by slowly pumping
the lubricant across a glass slide exposed to regions of successively greater magnetic field
strength. Where non-magnetic particles require analysis then the technique may be
enhanced further by the judicious use of calibrated membrane filters. This initial stage
provides quantitative analysis by grading the particles present in the sample from small to
large, to give the wear particle concentration (WPC) ratio. This is useful for observing
trends in WPC, particularly large particles, whose concentration will increase
significantly under abnormal wear. The second stage of testing, comprises qualitative
analysis of particles which are examined under a microscope. This enables shape, colour
and thus the origins of wear to be determined. More interestingly, from the predictive
stance, particle analysis generates information relating to the rate of wear progression.
The principal types of wear can be categorised as one of the following:
1 Scuffing: High loads or speeds generate excessive heat which breaks down the lubricant
between mating teeth. Adhesion ensues, causing roughening of the wear surfaces and
a subsequent increase in wear rate. Due to the nature of scuffing, particles present
share the common properties of a rough surface and jagged circumference. In addition,
the high temperatures generated cause oxidation which manifests itself as a bluing on
the particles.
2 Severe sliding or overload wear: Excessive stresses induced by high speeds or loads
will result in severe sliding wear, causing large particles to break off components.
Further elevation in stresses leads to a second transition being reached; where surfaces
breakdown and a catastrophic wear rate ensues.
3 Fatigue: Fatigue occurs as a result of excessive tensile stresses upon the mechanical
surface, which initiates fatigue cracks. Ultimately, total failure will occur.
Manual examination
The benefits of a relatively simple manual inspection of plant by an experienced operator,
should never be underestimated. Such inspections can yield vital information on machine
condition with minimum intrusion or cost. In essence, the four senses of sight, sound,
touch and smell are used to determine the condition of machinery. Hence, a leaking
hydraulic pipe can be detected visually, a fault in an exhaust system can be heard and
smell or touch can detect an overheated electric pump or motor. Together with data
collection for future analysis, visual inspection can provide vital condition monitoring
information. The principal benefit of manual examination is realised when used in
Equipment maintenance 157
conjunction with CBPM analysis. During the processing of CBPM data mistakes can be
made since neither computers nor data processors are ever totally infallible. Unusual
observations which do not fit previous patterns can therefore be checked for validity and
the discrepancy either rejected or confirmed.
However, human inspection has three principal disadvantages. First, information
generated tends to be qualitative and thereby subjective. Second, it is heavily dependant
upon the skill and judgement of the individual operative. Finally, one should consider the
fact that in most cases the technique can only detect component failure once a fault has
already occurred, at which point some damage has been sustained. Therefore, manual
examination is largely limited (although not exclusively) to being predominantly a ‘post
diagnostic failure’ method of condition based monitoring.
Vibration monitoring
Due to minor imperfections, rotational or reciprocating parts found within mechanical
plant (such as gear boxes, shafts and engines), produce vibration frequencies at various
signature amplitudes. The vibration occurs naturally to some extent, as a result of the
forces and mobility created in components of a machine when undergoing normal
operation, such that; force ×mobility=vibration. During use, moving parts wear or deflect
at an increasing rate as clearances between components increase and rotating parts
become further out of balance. By careful study of vibration levels, an assessment of the
condition of individual component parts can be made.
Vibration monitoring is to some extent a compromise, because in an ideal situation it
is the forces themselves (i.e. those causing the vibrations) which require measurement.
This is practically impossible, so a compromise is sought by measuring the vibration,
which has an indirect link to the force through a factor of mobility. Caution is necessary
Management of off-highway plant and equipment 158
because a high vibration level does not automatically indicate a faulty component. Such
vibration may result from a high level of mobility within that component. Periodic
measurements are therefore taken on the basis that the vibration amplitude will remain
constant unless a change occurs in the operating dynamics, that is, a defect occurs. Once
the wear process has begun, extra deterioration of the component will increase the rate of
wear. Consequently, a new component will run smoothly until wear becomes noticeable,
at which point the component will deteriorate progressively and manifest itself as ever
increasing levels of vibration.
In practice, baselines of vibration characteristics are mapped for new components to
serve as benchmarks against which to compare future vibration signatures (and thereby
facilitate machine diagnosis). Regular monitoring of vibration levels and comparison of
these levels to benchmark standards will alert plant managers to wear trends. This
provides an advanced ‘lead time’ warning of component failure.
The recent rapid development of personal computers and business software has
produced specific vibration control systems which further enhance the powers of spectral
analysis. Modern packages now offer fast and effective data collection, data
measurement, analysis and diagnosis.
Thermography
Thermography is the technology of measuring components’ infrared energy emissions
using thermographic instrumentation. Thermal imaging was originally pioneered in the
steel industry for monitoring the condition of blast furnace linings, stoves, steel mixing
vessels and electrical machines and equipment. In a maintenance context, deviations in
temperature conditions (components being hotter or colder than specified limits) are
indicative of pending problems. To the plant engineer, thermography is particularly well
suited for sensing excessive heat generated by friction in faulty rotating components of
mechanical equipment. An inoperative cooling valve will induce an increase in
machinery temperature, which in turn stimulates a catalogue of chain reactions, for
example, leaking gaskets, thermal viscosity, breakdown of lubricant protective qualities
and engine seizure.
Thermographic techniques are sensitive to variations in ambient conditions such as the
amount of air borne particles, so compensation for variations in measurement must be
taken into account when analysing thermal data. However, the principal benefit of using
infrared techniques in mechanical inspections, lies in their unique ability to
instantaneously pinpoint problematic areas and thus reduce labour maintenance costs.
Moreover, advances in microtechnology have inspired ever more compact ‘hand
held’equipment which is invaluable to plant managers operating on remote sites.
conditions encountered and numerous operators of various ability), the use of SBPM has
historically proven difficult to administer. However, the use of advanced statistical
software packages (such as Statistics for the Social Scientist (SPSS)) has automated the
process of analysis and facilitated wider and easier application throughout industry.
Corrective maintenance
Corrective maintenance is performed only when an unpredictable fault occurs. The ethos
of corrective maintenance is to restore equipment to a safe and operationally efficient
condition in as short a period as possible. Normally, diagnosis of the fault or failure is
followed by implementation of corrective action which may include:
• adjusting, replacing or repairing the parts, components and subsystems which caused
the unscheduled failure;
• checking the plant is operational again;
• cleaning the machine and logging the restorative action, action time and cost.
Corrective maintenance is valid maintenance practice since no matter how
technologically advanced the strategy adopted, plant managers may still be faced with the
odd breakdown which can neither be predicted nor actions taken to prevent its
occurrence. Thankfully, such occurrences are rare amongst modern machinery and
mainly limited to faulty components early on in a machine’s life.
Replacement
Most items of plant and equipment have a life exceeding the point at which a major
overhaul is required, and the question of replacement should therefore arise only when
the costs of maintenance exceed the benefits of operating the item. However, the state of
the secondhand market can fluctuate over the short term to provide a profitable
opportunity for selling the machine before its planned replacement period. Alternatively,
superior equipment may become available, to outweigh the advantages of holding
outdated machinery.
Equipment maintenance 161
Proactive maintenance
A relatively recent area of maintenance philosophy is root cause failure analysis. This
takes a proactive stance to maintenance by, as its name suggests, examining the source of
breakdown. The philosophy of proactive (as opposed to reactive) maintenance
concentrates on commissioning corrective actions to the underlying factors which initiate
fault. From the engineer’s standpoint, the root causes of maintenance relate to the factors
which alter a lubricant’s protective properties, for example, soil, fuel and water
contamination. However, from a management perspective, the true root causes of
mechanical fault include inadequate operator training, poor maintenance
specification/regime, inadequate plant maintenance policy and adverse operational
conditions. This is because internal component contamination arises as a result of these
factors. An understanding of the long-term benefits of controlling the root causes of
machine failure must be sought. Each of these root causes warrants further discussion.
Operator skill
Technologically advanced industries, such as manufacturing, enjoy the comfort of fully
automated machine trains which literally take resources in and push products out. On-
board computer aided monitoring ensures that optimum working levels are achieved,
whilst labour input is effectively cut to a minimum. Against this backdrop, CBPM is the
perfect solution to pre-empt breakdown via fault detection. However, within the off-
highway plant and equipment industry, there is an interdependent relationship between
machines and their operators. Unlike the technologically advanced machine trains used in
manufacturing (many of which have continuous condition monitoring), off-highway plant
and equipment is dependant upon operator competency to manually monitor machine
condition and take periodic samples for the various machine compartments. Such activity
is performed in isolation due to the bespoke nature of off-highway projects, an exception
being plant which operates in opencast mining where contractors usually have their own
plant department on site. Within general industry, the burden of daily predictive and
fixed-time-to maintenance responsibility lies heavily upon the shoulders of the plant
operator.
In most cases, plant operators have limited time to perform maintenance on their plant.
Instead, the operator may ‘work around’maintenance needs in an ad hoc way. When a
breakdown occurs emergency ‘restorative’ action is often taken to return the equipment
to working order as quickly as possible, as opposed to fixing the fault correctly. Over
time and use, the cumulative effect of deferring maintenance and performing inadequate
repairs culminates in plant requiring replacement before its expected life, or plant which
breaks down with increasing frequency and for longer time periods. Either way, the
negative impact upon business is profound.
The operator has an essential role in fixed-time-to maintenance. Oils must be changed
at regular intervals, greases applied to grease points, the equipment cleaned and many
other minor maintenance tasks conducted. Emphasis on maintenance strategy (i.e.
predictive or fixed-time-to) is therefore changing to a more proactive approach. Operator
Management of off-highway plant and equipment 162
competency is one of the most important factors to be considered since it is the operator
who implements maintenance directly. Success or failure of a maintenance strategy will
largely depend upon the operator’s attitude in this respect. However, management must
ensure that the operator is sufficiently motivated, trained and competent to conduct
maintenance correctly and in a timely fashion. Lack of routine maintenance scheduling,
maintenance materials purchase and poor supervision can all have a de-motivating effect
upon the operator.
Operational conditions
Off-highway plant and equipment is employed in a host of extreme weather and site
conditions. Environmental factors are particularly prominent in the mineral extraction
industries where a high proportion of severe wear problems arise from abrasion.
Typically in the UK one can expect to be exposed to a barrage of silicon (dirt) and water,
hence seals on equipment must effectively prevent contaminants from entering internal
compartments. Two factors can reduce the amount of mechanical wear caused by
operational conditions.
Manufacturer design
Perhaps the most significant positive contribution to proactive maintenance is going to be
made by plant manufacturers themselves. Improved wear resistant materials, systems,
designs and monitoring techniques to minimise the effect of inhospitable conditions (e.g.
underground coal mining) will both reduce the need for maintenance and extend the time
between maintenance periods.
an absolute minimum. One should always consider the cost of good housekeeping
compared to the costs of increased maintenance and reduced production. In either
example, these findings provide conclusive evidence that operational conditions
significantly influence machine maintenance costs.
Management responsibility
The off-highway plant and equipment sector continuously witnesses changes in
maintenance procedures and practice, equipment sophistication and equipment diagnostic
procedures. Ultimately, such changes contribute to the continued evolution of the modern
plant manager. Senior management must adapt to such technological changes for
continued success of the organisation. With advancements in information technology
(IT), for example, new breakthroughs will continue to occur at an increased rate.
Embracing continued developments in maintenance technology and practice will lead to
improved quality control, better plant information handling, lower costs and a more
highly skilled operator and line management work force. Unfortunately, maintenance is
one area where established management principles are sometimes ignored. Rather,
maintenance can be viewed as an encumbrance. Management must give the same
attention to plant maintenance as given to more ‘traditional’ responsibilities such as book
keeping, cost control, personnel management and leadership.
In plant management practice, education (or rather, lack of continuous education),
forms an impervious barrier preventing many potential benefits of technological change
from being embraced. Continuous training is vital for organisations who wish to maintain
a competitive edge over rivals since employees can become obsolete within a mere three
years of training completion. Consider guidelines for operating and maintaining plant and
equipment which are currently widely available to the plant owner. Not all plant owners
treat their equipment according to specifications. Problems such as incorrect specification
of oil are often encountered. This particular problem would be detected as an imbalance
of additive levels by the oil analysis but by the time of detection, irreparable damage may
have already occurred.
Management should also consider the wider implications of a maintenance stratagem
which fails to maintain historical maintenance data, for example, a complete history of
used oil analysis results. Because records are often forsaken for the benefit of space
saving, the opportunity to trend plant wear under operating conditions and thereby adjust
maintenance policies to optimum levels is ultimately lost. Maintenance management thus
fails to progress along the learning curve to enhanced utilisation of equipment. A
strategic approach which pays equal emphasis to managerial roles and responsibilities is
therefore required. This will involve the development of an efficient plant maintenance
policy which embraces:
• an effective programme of service repairs;
• clear guidelines for servicing responsibility;
• an effective spare parts inventory or delivery system;
• a clear method of managing the flow of paperwork.
Senior management may consider the adoption of ISO 9000 ‘Quality Management and
Quality Assurance Standards’. ISO 9000 should not be confused with Quality Control
Management of off-highway plant and equipment 164
(QC) which refers to the process of controlling quality and the employees who achieve it.
QC was popular in production departments but its popularity dwindled as the system was
based upon a false premise. That is, quality was external to production and that higher
quality was achieved through inspection and consequential acceptance or rejection of
poor quality items or practices. Quality management professionals realise today that
quality management must be a comprehensive program of continuous improvements to
the quality of an organisation’s products, processes and services. Hence, ISO 9000 sets
standards for evaluating the system of quality management within an organisation vis-à-
vis setting a standard for a product. Essentially ISO certification allows management to
question the quality of maintenance records and moreover, facilitate periodic external
evaluation by a certified company (by ISO standard officers) to determine continued
compliance.
Since senior management have ultimate control over the wider area of management
practice and quality assurance which must support maintenance practice within the
organisation, management responsibility is one of the most important factors which
denotes the success or failure of maintenance practice.
The essential aim of all the maintenance policies described is to keep equipment in
working order and so increase its productivity. However, the strategy required to achieve
this objective demands the implementation of technical and administrative procedures
which inevitably incur costs, and for any organisation, depending upon its maintenance
efficiency, there is an optimum level of maintenance provision, as shown in Figure 9.2.
This implies that at some level the cost of providing the maintenance service will exceed
the costs of machine ‘downtime’. Thus, not only is it important to install the correct
maintenance procedures, but also the costs must be maintained and controlled. These can
be considered in two classes – direct and indirect costs.
The budget provides the basis for monitoring the trend in overall maintenance
effectiveness. In order to collect costing information, each item is identified with a cost
centre, which
Indirect costs
When equipment breaks down, there is a loss of production while waiting for repair and
during the repair itself. For the hire firm this may cause a reduction of the budgeted
utilisation period and a loss in revenue, but for the owner–contractor the idle time of the
workforce must also be considered. It is important to consider these costs when preparing
an overall budget for owning and operating the machine, including the cost of
maintenance. Clearly, it is essential to decide upon realistic levels of utilisation time over,
say, a yearly budget.
Equipment maintenance 169
Safety inspections
The various safety regulations (see Chapters 8 and 10) require the inspection and testing
of equipment. All lifting tackle and most other types of equipment, when first acquired
and
before use, should be tested and examined by a competent person who should certify that
the equipment is suitable for use and issue a certificate stating so. In most cases this
certificate will be provided by the manufacturers but, if not, an insurance engineer can
issue such a certificate. Once the item is in use the regulations also call for periodic
testing by a competent person, the time interval depending upon the type of equipment,
and a certificate issued by that person.
Because the various regulations stipulate different inspection periods, the
recommended procedures to adopt should consist of a combination of self-inspection by
the owner or hirer at say one month intervals, and then external examination within the
legally stated testing period. This latter inspection could be performed by a qualified
engineer from the engineering inspection department of an insurance company. The
services of the insurance company, however, do not relieve the owner of the equipment
from the legal responsibility for periodic examination. Although most insurance
companies have their own methods to try to ensure that the statutory periods are met, they
are not legally bound to do this. Also, the insurance engineer having arrived at the
premises will not necessarily search for equipment to test or get it ready for examination,
and if the items are not to hand, then the inspection will most likely be missed. Clearly,
therefore, it is in the interests of the equipment owner to install the proper control
procedures for inspections.
Stock control can play an important role in securing the effectiveness of a maintenance
system. Manufacturers, suppliers and transport systems are rarely able to deliver goods at
the exact time required for the maintenance operation, and it is therefore necessary to
carry sufficient stock to act as a buffer between supply and demand for a component.
However, since the level of stock is only a buffer, it is important to keep levels to the
minimum needed to service the maintenance requirements and so limit the locked-up
capital, which otherwise could be more usefully employed elsewhere in the business.
The extent to which component types and stock levels are held will often depend upon
the nature of the maintenance policy and the proximity of the manufacturers’ distributors.
For example, the fleet operator hiring out to the market would probably carry a
sophisticated range of spares, whereas the business with only a few items would hold
only those parts in frequent demand. Thus, the extent to which stock control is made
effective is dependent upon:
1 defining a realistic stock objective in relation to the firm’s activities;
2 using stock as a buffer only to aid production continuity;
3 setting economic levels of stock to service the needs of the enterprise.
It is not possible to offer firm advice in setting the correct stock control objectives,
without having detailed information for a particular concern. However, the following
techniques are available for dealing with the problems arising in items (2) and (3) above:
(a) the ABC method of stock control and (b) inventory control.
Typically, stock items replenished over a common period could fall into the following
categories:
• ‘A’ items: 10 per cent in number, making up 70 per cent of the value of stock;
• ‘B’ items: 20 per cent in number, making up 20 per cent of the value of stock;
• ‘C’ items: 70 per cent in number, making up 10 per cent of the value of stock.
Table 9.1 ABC stock control example
Class Number of items Value of stock (£) ABC value of stock (£)
A 50 21,000 3,500
B 100 6,000 4,000
C 350 3,000 3,000
500 30,000 10,500
Inventory control
While the ABC technique of stock control provides a simple checking method, it is
usually also necessary to know when to order and the order quantity. In its simplest form,
stock is ordered when the current level of stock, minus the immediate stock demand,
equals the forecast demand before the next delivery arrives plus safety stock, thus:
The safety stock for a given lead time may be determined from past observations of
differences between forecast demand and actual demand. The size of the forecast error,
which may only be exceeded within a specified limit, defines the size of each safety stock
to provide against a stock-out. Unfortunately, this method requires information on each
stock item, which for a complex inventory would be too tedious to collect and so only
Class ‘A’ items might be considered in this way.
Equipment maintenance 173
3 A plot of the forecast errors against the frequency will tend to approximate to the
normal distribution and simple statistics can be used to determine the probability of
stock-outs and surpluses.
Example 9.1
The forecast errors shown above were recorded for a particular stock item. Management
wishes to know with 95 per cent confidence the level of safety stock required to avoid a
stock-out.
Solution
A plot of the forecast errors is shown in Figure 9.6. The sample is large and therefore
approximates to a normal distribution, and the mean and standard deviation are calculated
in Table 9.2.
Management of off-highway plant and equipment 174
From statistical tables, for a given error value x to lie within 95 per cent of the area under
the graph, Z=1.96, that is, within 1.96 standard deviations of the mean. Therefore, safety
stock=1.96×9.06=17.76 (say 18). If stock were ordered in four week cycles, the
probability is that a stock-out will occur every 80 weeks, that is, 5 per cent chance.
Example 9.2
Stocks of a component are allowed to run down to a level of three units before being
replenished. The components are used steadily at 50 items per week. The component
costs £15 per unit and the cost of storage and deterioration per week is 10 per cent of the
cost price. Each time a component is ordered there is a cost of processing this order of £1.
1 How many items should be ordered each time?
2 What is the cost of ordering and storing each item?
Solution
Let B=minimum stock level, that is, safety stock. Let Q=number of components delivered
with each order, D=rate of usage in units per week, S=cost of processing an order, h=cost
of storing an item per week as a percentage of cost price, P=cost of an item and t=time in
weeks between orders.
The cycle of usage and replenishment is shown in Figure 9.7. The average number of
items stored in time t is . Therefore, storing cost per cycle of length
.
Management of off-highway plant and equipment 176
(1)
Therefore
(2)
(3)
A rental firm calls for the steady supply of 50 components each week; the price of the
component is £30. The supplier usually keeps sufficient stock to meet demand, and the
cost of holding a component per week is 10 per cent of cost price. The cost to the supplier
each time a new order is processed is £10. However, sometimes the delivery date cannot
be met, so to make up the backlog there are special deliveries to the customer as soon as
the supplier is able to continue with the order. The extra cost incurred by the supplier in
this situation is £10 per component.
1 calculate the economic order quantity for the supplier;
2 calculate the total cost per week to the supplier of stockholding and processing orders;
3 calculate the level to which stock on site is topped up.
Solution
Z=cost of storage per component, Q=economic order quantity, A=top-up quantity; D=
rate of usage per week, h=storage cost as a percentage of the cost price of components,
P=cost of components, S=cost of processing an order; t=time in weeks between suppliers
(see Figure 9.8).
From Figure 9.8, storing as well as storage cost per cycle are calculated as shown
below.
(1)
(1)
Management of off-highway plant and equipment 178
Therefore,
(2)
(2)
(3)
(4)
Equipment maintenance 179
(3)
To obtain optimum order size, differentiate with respect to Q and A and maximise.
Components are required at the rate of 2,000 per month. The cost of ordering is £20 and
the cost of storing the material is 50 per cent of its purchase cost. The cost per item
depends on the total quantity ordered as follows: (1) less than 500 items @ £1.21 per
item; (2) 500–999 items @ £1.00 per item; (3) 1,000 or more @ £0.81 per item.
Calculate the optimum order quantity and the optimum total cost per month of
purchasing, storing and ordering the material.
Solution
Without discounts, only the costs of storage have been involved in the calculation and not
the cost of the material itself. This may result in a false situation, as follows:
Management of off-highway plant and equipment 180
(1)
(2)
(3)
On first inspection the optimum order quantity would be 363 units, but the calculation
so far does not take into account the cost of the material itself, which in this instance
varies according to the quantity ordered. Therefore, looking at total costs:
Therefore,
(1)
(2) (a)
(b)
Equipment maintenance 181
(3) (a)
(b)
The optimum order quantity, therefore, is 1,000 items per month and the total monthly
purchase, storage and ordering cost is £1,862.
A manufacturer is required to supply 1,000 parts each week to replenish stocks. The store
has very little storage space and thus requires the units to be delivered at the rate at which
they can be used. The manufacturer has the capacity to produce 2,500 units per week.
The cost of storing a unit per week is 1p and the cost of setting up the equipment for a
production run is £50.
1 What is the optimum number of units to produce in a production run?
2 What is the total cost of producing and storing the plant department’s requirements?
3 How frequently should production runs be made?
Solution
(1) Q=number of units made per production run, D=number of units required by plant
owner each week, k=number of units produced per week, H=cost of storing one item
Management of off-highway plant and equipment 182
Therefore
(2)
(3)
These examples clearly involve a refined level of stock control, necessitating detailed
information gathering. For many equipment stores departments, the types of stocks and
the spares are too few, and the usage too low, to need such sophistication. In that
circumstance, adoption of the ABC technique coupled with rigorous checking of both
stock and order processes should suffice.
Chapter 10
Health and safety
Introduction
The incorrect or inappropriate use of off-highway plant and equipment can result in
serious injury, or in the extreme, fatality. Post Second World War, individual
governments across continental Europe have recognised the issues of health and safety
but until quite recently, had each developed their own legislation in an attempt to reduce
risk of injury or ill health. Since the development of the European Union (EU), the
Council of Ministers of the European Community (EC) has sought to harmonise this
collection of disparate national legislation, through the introduction of EC Directives.
The underlying rationale has been to equip a potentially transient workforce with
consistent health and safety knowledge that ensures high safety standards are maintained
as they migrate across EU member country boundaries.
More recently, EC Directives have been specifically targeted at mechanical plant and
equipment usage. Such directives have been introduced and enforced. However,
legislation per se cannot secure a safer working environment, but rather, it is the adoption
of safe working practice that is important. Where the plant operator, maintenance crew
and plant manager are not fully conversant with current health and safety requirements,
then production processes become unduly dangerous.
The repercussions of accidents in the workplace are traumatic and often resonate
throughout the organisation, through industry and society. Safety management is
everyone’s business, and no one engaged with plant and equipment usage should be
excluded. Management should be conversant with the potential dangers faced by
employees when operating with or near plant and equipment, in order that effective
health and safety systems and procedures may be developed and implemented.
Employees should assist employers in the implementation of these systems, procedures
and good practice in order to ensure their effectiveness. Commitment of both the
employer and employees to the organisational health and safety policy (together with
effective communication of information) is the key to reducing accident rates. As the old
adage goes – know safety, no accidents!
Given the wide range and diversity of legal requirements and supporting
documentation, it would be difficult to address all health and safety legislation relating to
equipment management in this one chapter. Therefore, this chapter introduces the
principles upon which safe procedures and practice can be developed and applied within
industry. Information provided should not be treated as definitive but rather taken as a
general practical guide. It is strongly advised therefore that the original and relevant
legislation is reviewed before developing plant and equipment safety systems and
procedures.
Health and safety 185
When developing (or updating) a health and safety policy relating to plant and
equipment, management should give careful consideration to the cost implications
involved. It is the moral duty and responsibility of all plant professionals (both employers
and employees) to ensure the health, safety and welfare of themselves and others. This
duty is backed and enforced by relevant legislation that has been developed to combat the
growing incidence of plant related accidents. It therefore makes economic sense for a
business to ensure that no unnecessary harm comes to any person as a result of plant
usage, or from maintenance activities conducted on plant.
Direct costs
The direct costs of implementation are more readily quantifiable and include resources to
support the strategy, such as:
1 training and certification costs;
2 protective wear;
3 modifications to plant and machinery;
4 erection of site signs and the development of safe access routes;
5 insurance policies;
6 plant maintenance costs;
7 support services (administration, used oil analysis, workshops, etc.).
Indirect costs
The indirect costs associated with a health and safety policy are less tangible but no less
significant. These include:
1 management time to plan, organise, deploy and administer the policy;
2 production of literature to communicate the developed policy;
3 employee time to learn, incorporate and support the strategy;
4 non-productive time spent on acquiring training.
that the cost of health and safety failure (across all industries) could be as high as £18
billion every year (UK sterling, as at June 2000).
Direct costs
In the event of an accident occurring, the typical direct costs of not having implemented
an appropriate health and safety strategy include:
1 reparative work to damaged plant and machinery or other facilities (buildings etc.);
2 criminal conviction resulting in fines;
3 compensation paid to the victims;
4 increased insurance premiums.
Indirect costs
Other indirect costs of not having an appropriate health and safety plan in the event of an
accident include:
1 reduction in employee output as a result of illness or injury;
2 lost production due to inactive plant;
3 management time spent undertaking accident investigations and developing new
prevention strategies;
4 disruption to work in progress leading to late completion and potential loss of future
contracts;
5 bad corporate (and individual) publicity and possible imprisonment.
Given the previous, management must make a calculated assessment (usually via a cost
benefit analysis) as to whether the costs associated with measures taken to ensure safe
plant operation are reasonable and practicable given the risks involved. If not, then
management would be strongly advised not to tender for the works. In the longer term,
the cost of accidents far outweighs the cost of attempting to prevent them.
Accident statistics
There are various types of plant-related health and safety statistics available. However, as
with any source of statistics there are several ways in which they can be interpreted (or
misinterpreted). Table 10.1 provides general information on the total number of
accidents/ incidents for earth moving machinery (e.g. dozers, dumpers, excavators,
loaders and so forth) within the UK during the period 1986–1996.
The accidents are divided into five main categories: total accidents, fatalities, major
injury, operative incapacitation for over three days and dangerous occurrence. From these
statistics, it would appear that excavators are the most hazardous machine type to operate;
with over 486 accidents in total and 21 fatalities over the ten year period. However, there
are more excavators utilised throughout industry than any other machine type. This is
because excavators are extremely adaptable machines that can be fitted with a diverse
range of attachments including grabs, impact hammers and concrete crushers. Because of
Health and safety 187
this versatility, excavators are the biggest selling machine type with around 5,000 sold
within the UK alone and around 15,000 in the US. So although this table offers some
insight into plant related accidents, it fails to indicate the underlying rate, that is,
accidents as a proportion of the number of machines per category of machine. For
example, 10 accidents for 100 site dumpers is proportionally higher than 80 accidents for
1,000 telehandlers.
Table 10.1 Total number of accidents/incidents per
machine type in the UK, 1986–1996
Machine Number of accidents
Total Fatal Major Over 3 days Dangerous occurrence
Dozer/bulldozer 35 6 14 8 7
Dumper 179 15 72 92
Excavator 486 21 43 49 373
Grader 5 2 2 1
Landfill 6 1 1 4
Compactor
Loader 30 5 18 6 1
Pipelayer 4 2 1 1
Scraper 5 1 4
Trencher 2 2
Source: Male (1998).
Table 10.2 illustrates the distribution of accidents by industrial activity over the same ten
year period 1986–1996. This therefore highlights particularly dangerous industrial
sectors. The construction industry appears to be the most dangerous although again,
consideration should be given to the size of the industry and the number of plant items
operating within it, that is, the ‘average’ needs to be observed. The Health and Safety
Executive of the UK have recently confirmed the hazardous nature of the construction
industry. Specifically, it revealed that the construction operative is seven times more
likely to be involved in an accident than an operative in any other sector except mining.
An operative in mining is twice more likely to incur an accident than an operative in
construction.
In order to address the shortcomings of the statistics discussed so far, recent research
has sought to provide a more in-depth appreciation of health and safety incidents within
the construction industry This has been in order to determine not just the rate of plant
related accidents, but also to observe whether the rate has decreased.
There are 20 categories of accident recorded in the statistics held by the Health and
Safety Executive (HSE) (such as asphyxiation, exposure to fire, exposure to explosion,
etc.), two of which could be directly attributed to plant and equipment usage. These
Management of off-highway plant and equipment 188
categories are ‘contact with moving machinery or material being machined’ and ‘struck
by a moving vehicle’. The data available for accidents in these two categories is
represented graphically in Figure 10.1. Here the trend in plant related accidents for all
construction operatives between 1989 and 1999 can be seen; where the number of
construction operatives has been divided by the accidents per annum to obtain an
accident rate per 1,000 operatives.
Figure 10.1 shows a consistent trend throughout the period, with the average (mean)
being 0.47 accidents per one-thousand construction operatives and the highest recorded
rate occurring in 1989/90 (i.e. 0.55 per thousand). It is therefore apparent that the plant
related accident trend for construction operatives has remained consistent and thus,
largely unchanged throughout the period under scrutiny. This is despite the introduction
of new European Health and Safety legislation. It would be erroneous to conclude that
these findings provide definitive evidence as accident reporting (as opposed to accident
occurrence)
Table 10.2 The distribution of accidents/incidents
by industrial activity in the UK, 1986–1996
Machine Distribution of accidents (%)
Quarrying Construction Manufacturing Other Transport Agriculture Education Disciplined Others
services services services
Dozer/ 37 28 11 9 3 – 3 – 9
bulldozer
Dumper 6 83 4 3 1 1 1 1
Excavator 4 96 – – – – – – –
Grader 60 40 – – – – – – –
Landfill 33.33 66.66 – – – – – – –
Compactor
Loader 23 77 – – – – – – –
Pipelayer – – – – – – – – –
Plant organisations, and the individuals operating within them, should not consider health
and safety management as an extra business responsibility simply there to be complied
with, but rather, as an integral and necessary part of daily work activities. There are
mandatory requirements that must be adhered to but these should be perceived as an
assistance to business activities, not a hindrance. After all, accidents not only maim and
injure, but they also result in major losses in profitability as a result of downtime,
maintenance costs and financial penalties.
To assist the practitioner to develop safe practices and procedures, a range of advisory
bodies, legislative documents and practical notes are available. The eradication of all
plant related accidents would be difficult to achieve. Nevertheless, through continual
consultation with the relevant information sources, accident rates can certainly be
reduced. The Health and Safety at Work Act (HASWA, 1974) provides a legislative
framework designed to encourage high standards of health and safety at work. HASWA
1974 defines two authorities and gives them power for the enforcement of the legislation
(Sections 10–14 and 18–24).
Management of off-highway plant and equipment 190
Legal documentation
There is voluminous health and safety documentation with which to consult, each with
varying degrees of authority. Key documents can be classified as being either Acts,
Regulations, Approved Codes of Practice or Codes of Practice. Each of these is now
briefly discussed because an understanding of these documents is essential to health and
safety management.
Acts
Acts (e.g. the Health and Safety at Work Act (HASWA 1974)), are known as statutes,
which are passed by full parliamentary procedures and enforced by criminal law. Often,
acts such as HASWA, called ‘Enabling Acts’, are arranged to allow supplementary
regulations to be made by the Secretary of State without going through full parliamentary
procedure. HASWA 1974 is wide ranging and covers everyone involved with work (both
employers and employees) or those affected by it. In the USA, the Occupational Safety
and Health Act (OSHA) affords similar protection.
Regulations
Regulations have the same power and status as Acts. To date, the majority of British
safety regulations have been made under HASWA 1974. However, Britain is part of the
EU which has sought to standardise legislation across member states. EC regulations now
take precedence over national legislation; and recent years have seen the introduction of
regulations such as the Provisional Use of Work Equipment Regulations (PUWER, 1998)
and the Lifting Operations and Lifting Equipment Regulations (LOLER, 1998).
status and thus in the event of an accident, failure to follow ACOPs may be viewed as a
contributory factor in subsequent investigations.
Codes of Practice
Codes of Practice are guidance notes provided by trade unions and professional
organisations and contain sound pragmatic advice and guidance. They often consist of a
series of statements that prescribe the minimum standards of practice to be observed
within a specific industry. Essentially, codes of practice are concerned with professional
responsibility and are intended to be observed in the spirit and not merely the word.
Similar to ACOPs, implementation of alternative ‘bespoke’ advice and guidance can be
given as evidence in court.
The vast majority of health and safety legislation places a duty of care onto employers
and employees to ensure that the health, safety and welfare of employees and the public
are protected. Failure to comply with this duty of care is called negligence. For the
lawyer there are three possible connotations for negligence. It may signify a person’s
state of mind, where they are blind to the consequences of their conduct. It can be a
standard or measure of behaviour, for example, where a person has acted carelessly,
either inadvertently or otherwise, and not as a prudent person would have done. Or
finally, it may refer to the tort of negligence whereby a person has acted carelessly and
exacted damage onto others and may be liable to pay compensation.
In order to protect themselves from negligent actions, plant owners and operators
should understand the terminology regarding the required defined actions in the
legislation. There are currently three generic duties:
1 Shall or must are absolute duties. These have to be obeyed regardless of cost and thus,
if the duty is not feasible then the plant related activity must not take place.
2 If practicable means that the duty must be obeyed if feasible; cost is not a
consideration. This definition of practicable is therefore more flexible than the
previous duty. However, if management deem the duty not to be feasible and an
accident results then proof of this assertion will be required.
3 Reasonably practicable requires a delicate balance between cost and risk and is more
problematic. In the event of an accident the plant owner will be required to justify
actions taken.
HASWA 1974 defines and imposes general duties upon a number of different categories
of persons including employers, the self employed, those people who control premises,
plant manufacturers and employees. This philosophy of shared responsibility is an
important doctrine of health and safety legislation since it would be unrealistic to expect
the individual to bear the brunt of all legislative requirements, or to solely ensure a safe
working environment.
Employers
Health and safety 193
It is the duty of every employer to ensure, so far as is reasonably practicable, the health,
safety and welfare at work for their employees. This applies particularly to the provision
of equipment and systems of works, that are safe and without risk to health. In particular,
the duties of the employer include:
1 ensuring that all machinery, equipment and appliances used are safe;
2 ensuring that the handling, transportation and storage of materials are safe;
3 providing information, instruction, training and supervision to ensure the health and
safety of employees at work;
4 maintaining safe means of access to and egress from places of work;
5 provision and maintenance of a safe working environment with adequate facilities for
welfare at work;
6 preparation and appropriate revision of a written statement explaining the employer’s
general policy with respect to the health and safety of employees, and organisation and
arrangements made to carry out the policy effectively.
Employers also have a duty with regard to the health and safety of persons who are not
employees, such as self-employed or contractor’s employees who may be working with
their own employees. This duty extends to members of the public and employers must
ensure that the public are not exposed to health and safety risks.
Self-employed
The self-employed must ensure that as far as it is reasonably practicable, their conduct
does not expose themselves, or others, to any risk from health and safety. This point is of
particular relevance when considering the nature of plant hire, where machines can be
hired ‘driverless’ to self-employed private contractors. Plant managers should note that
the PUWER regulations state that the operator must be competent, but they do not
stipulate that training is mandatory. In some instances, the self-employed have operated
machines on site even though very limited training has been received. Practitioners have
recognised this as a loophole in the legislation and have sought to enforce mandatory
certification throughout industry via self-governed safety charters. The Major Contractors
Group within the UK construction industry represents a typical example of industry self-
government.
Plant manufacturers
Plant manufacturers must ensure that articles and substances are so designed and
constructed so as to be safe and without risk to health. The caveat here goes on to state
‘when properly used’, as the legislation cannot totally prevent the misuse of equipment
and plant by incompetent plant operators. Neither can they prevent the influx of ‘grey’,
non-CE marked machines that enter the EU each year. These are machines which are
imported from countries outside the EU and do not conform to standards set under
European law (e.g. with respect to emissions, noise pollution and so forth).
Employees
Employees must take reasonable care for their own and other persons’ health and safety.
For example, they should use safety equipment provided without interference, such as
tampering with locks on movable guards. The employee must also co-operate with
employers and any other relevant person(s) to enable them to perform their statutory
duties. In order for them to achieve these objectives, employees must consult with their
worker safety representatives and trade unions where applicable. If an organisation has
five or more employees it must have a written safety policy defining its responsibilities
and employees must be aware of its existence and content.
The PUWER 1998 provide guidelines which aim to engender good practice. They state
that account should be taken of:
1 working conditions and hazards encountered in the work place;
2 additional hazards created by the use or installation of work equipment;
3 equipment to ensure that it is fit for the intended purpose;
4 equipment maintenance to ensure that machinery is safe to operate;
5 operative (and other plant professional) training and instruction in order to ensure
competence.
These directions provide a commonsense approach to plant and equipment safety
management and are broadly applicable throughout most industrialised nations (not just
those within the EU). The directions cannot prescribe how an organisation should
develop its health and safety strategy since this would be impossible given the diverse
range of industrial activities.
This section therefore provides a generic framework for a comprehensive health and
safety management programme for plant and equipment. The guidance provided can be
used by both plant professionals charged with the responsibility of developing a new
health and safety programme and those evaluating and refining existing programmes.
Information contained herein will serve, along with other supplementary reference
materials, as an invaluable resource to assist plant professionals reduce the number and
severity of plant related accidents in the workplace.
Health and safety 195
Management of a health and safety policy is a cyclical and continuous process that can
be broken down into five core components (refer to Figure 10.2). These components are:
1 Developing (or redeveloping) an effective health and safety policy that provides clear
direction for the organisation and its employees.
2 Organising the enterprise into an appropriate and efficient structure to facilitate the
effective delivery of the health and safety policy.
3 Planning a rigorous and systematic programme of action to ensure the effective
implementation of the health and safety strategy proposed.
4 Evaluating performance of the health and safety policy developed through comparative
measurement against mandatory and in-house standards and procedures.
5 Reviewing performance through either an internal or external review or a combination
of both.
Each core component relies upon the success of the others to ensure that the whole
framework of health and safety management is successful. Greater consideration is now
given to each stage.
engender and foster safer working practices throughout the organisation should be made.
A typical policy would include:
1 A statement of policy that details who is responsible for health and safety management
and establishes key performance indicators.
2 A general statement of intent that details what and who will be covered/included in the
policy.
3 Arrangements for the operation of this health and safety policy which details how
measures and procedures will be employed to reduce accident/injury occurrence.
It is important that employees, or their representatives, are consulted when developing the
policy, because they are after all, an integral part of the process. This will help engender a
sense of policy ownership throughout the organisation. Employees (in particular, plant
operators) possess inherent knowledge of the operational environment and equipment
they operate. This is particularly relevant in the construction industry because site
managers often ‘evolve’ from either a building surveying, quantity surveying or
construction management background and may therefore lack ‘formal’ plant and
Health and safety 197
equipment knowledge. Consultation with the plant operator will prove to be an invaluable
input source into plant aspects of a health and safety policy.
Management commitment
Management have control over most corporate resources, so their organisation of such
must provide demonstrable evidence of unequivocal commitment to health and safety.
This is achieved by compliance with safety legislation and by providing visible
procedures, assistance and support to the efforts of others. In particular, managers should:
1 Endorse the policy developed by providing necessary implementation tools and support
services such as budget, expertise, personnel with accountability, programme review
procedures and so forth.
2 Empower a designated person, or team of people, with the responsibility to manage a
comprehensive health and safety programme. Chosen candidates should have
sufficient experience and expertise in plant and equipment hazard identification and
have access to relevant and current health and safety literature.
3 Provide funding to enable health and safety representatives to purchase health and
safety equipment and provide adequate training.
4 Ensure that professional development interviews/evaluations contain specific reference
to health and safety management.
5 Create, communicate and enforce a control and disciplinary system that applies equally
to all staff (plant operators, plant managers, site supervisors, etc.).
Employee participation
Employee participation and commitment to the policy should provide an effective means
through which they can identify hazards, recommend and monitor abatement, and
otherwise participate in their own protection. Participation in the decision-making
process is of particular significance since it will help to empower and motivate
employees to actively pursue policy objectives and goals. In order to facilitate employee
involvement in the health and safety policy and moreover, organise this valuable resource
to its best capability, management should:
1 Designate employees for health and safety tasks and duties that exploit their special
interest and/or expertise.
Management of off-highway plant and equipment 198
Competence
Competence is a vital element in achieving success in the implementation and
management of any health and safety policy. Essentially, competence is achieved by a
combination of initial training, practical experience and accrued knowledge. This aspect
of competence is discussed in greater detail in Chapter 11.
Risk assessment
There are five steps to conducting a health and safety risk assessment, these are (refer to
Figure 10.3):
1 look for hazards;
2 decide who might be harmed and how;
3 evaluate the risks and decide whether existing precautions are adequate or whether
more should be done;
4 record the findings and precautions taken;
5 review the assessment and revise it if necessary.
Each step represents part of an iterative process that enables an organisation to acquire
detailed knowledge of potential health and safety risks in the workplace.
Health and safety 201
Identify hazards
Hazard identification on machines or processes can be achieved by inspections, internal
and external audits, study of incidents (near misses) and, for new plant, by investigation
at the design stage, although this is largely the remit of plant manufacturers. Plant owners
can reduce potential hazard by refusing to purchase substandard ‘grey machines’.
Involvement of the workforce at an early stage of the process (i.e. operators, maintenance
crews and so forth) will help ensure that they adopt these safety procedures developed. It
will also provide them with the opportunity to identify potential hazards that may not be
immediately ‘obvious’ to management. Examples of hazards that can be reasonably
anticipated include: crushing, temperature hazards (burning or freezing), impacting,
snagging points which lead to entanglement, blinding, explosions via
demolition/quarrying activities, cutting from moving edges, stabbing, shearing (leading to
amputation), electrical hazards, inhalation or contact with dangerous materials and so on.
Failure modes should also be considered, using standard methods such as a hazard and
operability study.
Management of off-highway plant and equipment 202
whether this remaining risk is high, medium or low. Legislation generally provides the
‘minimum requirements’ and if at all possible, plant professionals should aim to
minimise the risk by adding precautions as necessary. Ideally, hazards should be removed
altogether if at all possible and if not, then adequate control mechanisms should be
provided.
(2) The possible severity of the accident. When assessing the severity of the possible
injury, various sources suggest the following four classifications:
(a) fatality, to include one or more deaths;
(b) major non-reversible injury, for example, amputation, loss of sight, disability;
(c) serious reversible injury but medical attention required, for example, burn, broken
joint;
(d) minor small cuts and bruises.
Recording this data will enable the organisation to benchmark its health and safety
performance against that of previous years as well as examine the magnitude of accidents
that occur.
(3) The length of exposure to the hazard. The next step is to consider how often people
are exposed to the risk. Suggestions here are:
• frequent – several times per day or shift;
• occasional – once per day or shift;
• seldom – less than once per week.
Also important is how long the exposure period will be. Is the person exposed to danger
for a few seconds per event, or as can occur with major maintenance work, several hours?
There may also be a need to consider the number of people who may be at risk; often a
factor in petro-chemical plants.
The factors are then multiplied to determine a score between 1 and 100; where 1
represents wholly safe conditions and 100 represents totally hazardous conditions.
Consider the following three scenarios:
Point (A) F=10; S=50; and P=50. Therefore, 10×[(50+50)×0.1]=10 (x)×10 (y)= risk
rating is high at 100. Work must stop immediately.
Management of off-highway plant and equipment 204
Point (B) F=1; S=5; and P=5. Therefore, 1×[(5+5)×0.1]=1 (x)×1 (y)= risk rating is low
at 1. Work can progress.
Point (C) F=5; S=20; and P=30. Therefore, 5×[(20+30)×0.1]=5 (x)×5 (y)= risk rating
is medium at 25. Work can progress once further safety measures have been
implemented.
In the case of possible harm resulting, decimal places are rounded up to the next whole
number co-ordinate.
As an alternative, the factors of the exposure to the risk and the possible harm
resulting (where the latter is obtained from the summation of the severity and the
probability) provide x and y co-ordinates (on a 1–10 scale) which can be mapped against
a prepared tabular format. This can be classified into high, medium and low risk (refer to
Table 10.3).
Table 10.3 Risk rating: a tabulated comparison
Both systems presented here are purely illustrative. The definition and delineation of the
boundaries between the three classifications of high, medium and low risk exposure
should be resolved by practitioners working in a given industry and when applying
‘reasonable’ judgement. The examples and accompanying table must therefore be
adapted to given work situations and would not be appropriate for every work
environment.
There is a vast amount of legislation covering health and safety and to cover every item
of legislation, applicable to each individual industry, within one textbook would be
difficult. However, a list is given below of those which are commonly encountered within
industry. This list is by no means definitive but readers are requested to seek out and read
relevant legislation and appropriate Codes of Practice a priori to the development of
individual plant and equipment health and safety strategies. Key legislation includes:
Introduction
Conversely, the negative ramifications of the poorly trained operator include reduced
production output, greater potential risk to safety (both to operators and their site
colleagues) and severe financial damages in the event of injury or damage to person or
property. Arguably therefore, the efficient and effective management of plant operators is
perhaps one of the most important areas of off-highway plant management. It is also one
of the most neglected topics in most textbooks on plant and equipment management.
known tick box culture) in addition to formal training regimes employed in an attempt to
protect themselves from any health and safety breach. Such a culture cannot indemnify
practitioners from litigation, although it may serve to illustrate where further operator
training is required.
Operator certification
However, a Voluntary Code of Practice (VCOP) for off-highway plant operator training
and competence development (originally written by National Plant) has been published.
This document represents a major step forward as it will ensure a more homogeneous
standard of operator training throughout industry (and will not be restricted to the
construction sector).
finance, and operator devotion. There are three fundamental stages that underpin operator
competency. These are:
1 Formal training, to include company induction, theoretical training and practical
training. This essentially aims to provide operators with instructions regards good
industrial procedures and practice and will be tested to ensure that required standards
are achieved.
2 ‘On-the-job’ training experience which commences the process of practical skills
knowledge and operational ability acquisition.
3 Continual employee evaluation which will ensure that operators retain core skills and
attain new ones thus maintaining competency skills. Refer to Figure 11.2.
A combination of these three components will ensure that the trainee receives and
comprehends instructions given and utilises the information to safely operate the plant
item in an efficient and effective manner. Each stage will now be explained in more
detail.
Formal training
Formal training encompasses company induction, theoretical and practical training and
testing knowledge retained. Company induction introduces the operator to the
organisation, culture and way of thinking. In addition, theoretical and practical training
will provide the operator with the skills to fulfil basic organisational requirements and
objectives. Consequently, business aims have a far greater probability of being realised.
Information on training received by the operator is recorded onto an operator training
achievement matrix (refer to Figure 11.3). This enables management to determine what
training has been undertaken and areas where further training is required. Such a matrix
also charts whether the operator has acquired sufficient operational skills.
Company induction
The company induction process informs operators of their roles and responsibilities
within the organisation, to themselves, and to others. The process commences with an
introduction to the new work environment. Ideally, this induction should start on the first
day of the operator’s employment. An information pack, presented to the operator, will
help the new
Investing in off-highway plant operator development 213
Theoretical training
The purpose of ‘taught’ plant theory is to instil operators with relevant information that
will ensure safe and productive plant operation. Operators are therefore forewarned of
any potential hazardous situations, their potential consequences and how to avoid them.
Source material
When teaching theory, the training provider can refer to a wide range of written material.
For example, the machine operations and maintenance manual, current health and safety
legislation, codes of practice, company and job specific site rules, etc. These documents
must be read and understood by both managers and operators as part of the process and
prior to the operator commencing training on the plant item itself. In a practical context
an experienced operator attending such a course may well lack theoretical knowledge
pertaining to the plant item they currently operate. Because an operator has operated a
machine for many years, it does not necessarily follow that they have operated the
machine correctly, or to its best ability. Experience of plant operation itself is not enough
to ensure that operating techniques employed are efficient and safe.
Method of delivery
The method utilised for delivering theory can be varied and largely dependent upon the
training provider chosen. Nevertheless, it should be recognised that each operator has
individual needs and that their rate of learning can be increased (or otherwise) by the
application of different stimuli. Some operators can best learn instructional material
independently while seated in a classroom, others require a more nurtured and supervised
approach and some benefit more from direct participation. In most cases, a combination
of different stimuli delivers the optimum level of learning in the least amount of time.
Formal education need not take place in a classroom. Discussions can consist of the
trainer verbally explaining the educational material to the trainee, either in the workplace
or on site. Alternatively, the Internet is an expanding, versatile and reliable medium
through which to educate, train and test plant operatives. The operator and plant manager
should jointly decide upon the most suitable method.
2 Training providers can convey the necessary information in a reduced amount of time.
3 Trainees are more likely to acquire understanding than through an extensive non visual
description.
4 Trainees will have greater retention of information.
Once the method of delivering the theoretical aspect of the training has been selected and
implemented, consideration should focus upon practical training on the machine itself.
Practical training
The practical element of a training course should consist of a combination of observation
and supervised ‘hands-on’ operation, that is, the trainee plant operator will receive a
demonstration of basic machine manoeuvres and maintenance performed by a competent
operative (trainer) prior to acquiring practical experience. The practice area should be as
level and clean as possible so as to avoid any unnecessary danger. This will allow the
operator to acquire operational confidence and basic operating skills. Thereafter, the
training should aim to simulate a more realistic work environment whereby the operator
is gradually introduced to various site conditions of increasing difficulty and alerted to
potential hazardous operational conditions. At this stage, the trainee can begin learning
more complicated manoeuvres and techniques.
Consideration should also be given to the machine make and model that the operator is
trained upon as each has different operating characteristics, limitations and other unique
features. For example, consider the new Caterpillar 432D wheeled backhoe loader that
includes innovative pilot controls to enable ease of operation when compared to
traditional lever controls. ‘New’operators receiving taught instruction on these machines
may well find some difficulty operating ‘traditional’ models that still exist (and are still
manufactured). In addition, some machines can be fitted with specialist attachments that
may affect equipment operational techniques and procedures. Therefore, the ideal
training program should be based upon the type of vehicle that the trainee would be
authorised to operate.
Table 11.1 represents an outline of a generic operator training program in which
characteristics of the plant item(s) that the operator will operate are obtained.
The operator should also always refer to the manufacturer’s operations and
maintenance manual that accompanies the individual machine operated.
Table 11.1 Essential content of an operator training
program
Item Description
Machine Machine anatomy on a compartment level (i.e. engine, transmission, hydraulics,
anatomy etc.) with some reference to individual core components (i.e. filters, hydraulic
hose ‘O’ rings and so forth)
Machine size restrictions
Machine visibility to include: manual, mirrors and rear-view cameras (if fitted)
Vehicle capacity and stability
Machine Daily maintenance procedures with operator roles and responsibilities
Management of off-highway plant and equipment 216
testing, the standard of questions must be high enough to ensure that the trainee
contributes to a safe, productive working environment and should be relevant to the
operator’s daily tasks and duties.
Test security
Test administration can be difficult in the absence of rigorous systems and procedures
that ensure that the operator who receives training is the same operator that attains
accreditation. There have been cases in the past where operators have fraudulently
obtained operator certification. To avoid certification registration abuse, thorough and
meticulous documentation is required. Figure 11.4 represents a template record of a
‘training received’ form. The first part of the form records personal details of the operator
along with a photograph for security purposes; this is to ensure that the person who
attains the card is the same person who has undertaken the training. The second part of
the form will detail the type and model of machine operated together with a description
of training received and signatures of both employer and employee.
Ideally, the training package should be divided into core modules and upon
completion of each module, a record of training received should be completed and
retained by management.
On-the-job training
should also be given to the function of plant and equipment and how the machinery
interacts with personnel on site. Other factors which should receive due consideration
include:
1 Familiarisation with pedestrian and vehicle traffic routes in order to ensure, as far as is
reasonably practicable, that risks to the health and welfare of operatives are
minimised. The operator will also have to be aware of floor surfaces and/or ground
conditions where the vehicle will be operated since this can influence machine
operation.
2 For vehicles that carry loads, the composition of probable loads and determination of
load stability. Similarly, an in-depth knowledge of load manipulation, stacking,
unstacking, loading or dumping procedures should be acquired.
3 Operating techniques, systems and procedures when working in classified hazardous
locations that exist or may exist in the workplace.
4 Operating the vehicle in closed ‘unventilated’ environments, trenches, or confined
spaces where insufficient ventilation and/or poor vehicle maintenance could cause a
build-up of noxious carbon monoxide exhaust fumes.
Upon completion of the probationary period, the employer should then complete a
certification of training record which collates core information on the name of the
operator, the date of the training, the date of the evaluation and the identity of the
person(s) performing the training or evaluation. This information is retained in an
operator logbook which can be readily obtained by both the operative and the employer,
or alternatively in the case of an accident, the Health and Safety Inspector. The employer
must certify that each operator has been trained and evaluated as required by the
organisation’s standards. Figure 11.5 provides an example of an operator logbook issued
by the CMPE. Each page of the logbook records the core information listed above and
consists of five main sections; namely operator details, plant specific details, customer
details, site details and comments. Within the CMPE logbook there are numerous blank
pages that allow for a new form to be completed at the end of each working week.
Potential future developments include the introduction of a smart card (similar to a
credit card) that contains essential information on the operator’s training and experience.
Only when this information is at the required standard should the employer, or training
provider, issue the operator with a certificate or card of competence.
Employee evaluation
observation should point out the incorrect manner of plant operation or other unsafe act
being
Introduction
Operational planning commits the resources and actions required to successfully achieve
organisational objectives. The ‘plan’ can be as exhaustive as required but the degree of
detail will ultimately depend upon the nature of the business and its plant holding. Larger
Opertional planning of equipment as a resource 223
companies with huge financial investment in plant and equipment (and ancillary services,
e.g. equipment inventory storage, management software, mechanical fitters and so forth)
would require more meticulous plans than say the owner operator. Nonetheless, planning,
for any plant owner, can make the difference between a successful and failed business
venture.
Prior to plan preparation, management should consider and discuss what types of off-
highway plant management strategy are to be employed, both within the organisation and
per project. All relevant factors should be considered such as finance arrangements,
production requirements, health and safety, maintenance management and human
resource management. Such information can be obtained from data held within the
company itself or sought from external consultants. After careful review, an appropriate
operational plan should be prepared to ensure that enhanced plant performance is
achieved.
Planning is not a singular activity but rather a process of activities that culminates in the
production of a plan and its subsequent implementation. However, planning should be an
iterative process, the plan requiring periodic assessment during and post implementation
(using a control loop). Figure 12.1 represents the process leading to the development of
an operational plan.
The first step in the planning process is to conduct an overview of the organisation’s
operational activities in order to assess the current business strategy. Second, relevant
organisational data must be collected and analysed to determine the existing performance
of plant and equipment under various operational scenarios. Such data will help to
establish performance benchmarks and enable the future production of more accurate
operational plans. Performance data gathered can then be modelled using one of several
deterministic techniques (e.g. time series analysis or regression). For example, the travel
speed of a dump truck is dependent upon many variables, such as ground conditions,
whether the machine is loaded or not, the angle of slopes, the specifications of the
machine (horsepower etc.) and so on. Accurate modelling of these variables enables the
impact of each to be determined such that future estimates of machine production (and
thus profit), for any given operational scenario are reliable. Output from the forecasts and
predictions is then assessed to prove the robustness and accuracy of the models. Once
proven, the next step is to transform the models developed into user-friendly planning
aids, such as Gantt charts. Finally, the plans and models are periodically evaluated and
improved.
appropriate information when required and not just spurious reams of data with no real
use or meaning.
Those contemplating the development of an MIS will first need to identify the type of
data required and determine how such could be collated. Two types of data are available,
namely secondary and primary data. Manufacturer specifications and applications
handbooks (particularly those developed and published in performance handbooks, e.g.
by Caterpillar and Komatsu) are a readily accessible source and provide a wide variety of
meticulous ‘secondary’ information regards machine costs, expected performance and
longevity under given scenarios. Whilst this information can form the basis of a plant
management strategy, it may contain some bias and may not provide a complete solution.
Therefore, when predicting production output, financial expenditure or when using the
production output to develop plans, the collation and analysis of ‘primary’ information is
important.
Work environment, operator skills and competence, machine activity (for instance,
breakers attached to excavators) and so forth, all impact upon machine performance and
therefore must be measured. Work-study provides an opportunity to measure these
primary data sources and can be described as ‘the systematic examination of activities in
order to improve the effective use of human and other material resources’ (Pilcher, 1992).
Thus, work-study collects primary information and aims to acquire a greater
understanding of operational processes and procedures so that subsequent refinement and
improvement can be made. It represents a critical self-appraisal of the work environment
and facilitates effective streamlining of the company and its plant holding to be made.
A typical example of the potential benefits to be accrued from using work-study is
provided by considering a practical problem where a backhoe 360° tracked excavator has
been loading overburden into a rigid dump truck. Management complained to the
manufacturer that predicted production rates had been substantially lower than actual
rates. Upon work-study examination of the loading activity, it became apparent that the
excavator was situated on the same substrata level as the dump truck. This meant that the
excavator had to load the bucket, slew to the dump target, and importantly, raise the
machine boom, dipper and thus bucket, before discharging the overburden. The position
of the machine, in terms of height relative to the dump truck, meant that the machine
cycle time was increased significantly as a result of the machine arm having to be raised
to the depth of the excavation plus the height of the dump truck. After further
consideration, a mound of earth was constructed to act as an operating platform
(otherwise known as a bench). This raised the height of the machine above the dump
truck and reduced the cycle time dramatically. Essentially, this meant that once the
machine had filled its bucket and was at the top of the bench it was also at the correct
height to slew to the dump target, thus reducing the ‘lift’time. The emphasis in this
example is on machine production but the process of reviewing, assessing, developing a
new process, recording data (in this case cycle time) and measuring whether the new
process is an improvement upon the previous can be applied to many other plant
management problems.
Management of off-highway plant and equipment 226
Once the data (historical, primary and secondary) has been collected, business forecasts
can be developed. Forecasting is an integral part of operational planning. When managers
formulate a plan, they strive to determine in the present what necessary courses of action
their organisation should take in the future to ensure a successful business venture. On
occasion, unpredictable events will significantly influence the effectiveness of the
forecast and render it less accurate. Indeed, there are so many unpredictable social,
economic and political variables that sceptics would suggest that any prediction is futile.
Nonetheless, some assumptions about the future are more reliable and include: the
availability of financial, human and material resources; changes in mechanical (and
other) technology; competitor strengths and weaknesses; and government taxation. Even
when using these relatively stable statistics, any prediction made will never be 100 per
cent accurate. However, it is far better to supplement ‘gut feeling’ of a trend with a
rational assessment of it – forecasting is both an art and a science!
Essential ingredients of a good forecast are that it is easy to use and interpret and is
practical. Complexity is not always the best solution; some of the most sophisticated
economic forecasts have been a failure. Unfortunately, some managers base reports and
plans upon simple trends and intuition. Thereafter, an inaccurate interpretation of the data
is made, using a mixture of subjective hunches and aspirations that are grounded neither
in today’s realities nor tomorrow’s scientifically projected future. Data is undoubtedly an
important ingredient in preparing effective plans but it requires insightful manipulation
and consideration to be useful.
The following techniques represent an introduction to fundamental deterministic
quantitative statistics that have already been successfully applied within off-highway
plant management research work. It is not the intention to prescribe a complete data
analysis strategy that would naturally achieve effective management of plant. Rather,
examples given will assist students and practitioners develop a fundamental
understanding of how data can be successfully exploited in practice. Whilst the
information contained herein is by no means definitive, it will act as a catalyst to learning
more complex and novel techniques.
Some a priori knowledge of basic statistics has been assumed together with a
rudimentary knowledge of Microsoft Excel. The analysis will utilise Microsoft Excel as
this is a popular, widely used and thus, accessible package amongst students and
practitioners; albeit, other analysis packages such as Statistics for the Social Scientist
(SPSS) and Minitab are worthy of consideration. The following text has been designed to
be read quickly and absorbed with a minimum amount of effort. To reinforce the learning
process, a series of worked examples, complemented with appropriate screen dumps, has
been provided. The reader is urged to work through these examples and follow the step-
by-step process.
Opertional planning of equipment as a resource 227
Correlation analysis examines and explores the relationship between two (or more)
variables to measure the strength of association between them. Consider the travel time of
a rigid dump truck and the distance it travels. If these two variables are plotted they could
form one of three scatterplots; illustrating some, perfect or no association (Figures 12.2–
12.4 respectively).
Although the trend for some and perfect association shown in these examples is linear
(i.e. a straight line), the association may alternatively be curve linear (e.g. exponential or
cubic). It is therefore advisable that a graphical representation of the data be examined
before continuing with any further analysis.
Example 12.1
A site engineer knows that (as a general rule) the rate of site productivity shares a linear
relationship with the actual number of ‘working hours’each week. That is, longer
working hours equate to higher productivity. A series of production data for plant
operators operating backhoe loaders (specifically, m3 excavated per hours worked) are
recorded monthly over a 12-month period (refer to Figure 12.5). Ten operatives are
working at any given time.
Data examination
The first step is to view the data for any trends that may be apparent. An initial perusal of
the data identifies that the working hours seem to be lower during the winter periods and
increase as climatic conditions improve. One would expect to find such a trend since
inclement weather (rain and frost) can hinder or even halt production work.
Scatterplot production
The second step is to construct a scatterplot in order to view the pattern between the
hours worked (Y axis) and the machine output (m3) (X axis). To do this, highlight cells
‘C2:D13’ and click on the Chart Wizard icon (refer to Figure 12.6). Select XY (Scatter)
and then press the Next button and cycle through a series of windows to produce the
graph illustrated in Figure 12.7.
Management of off-highway plant and equipment 230
Figure 12.7 provides evidence that a positive linear relationship exists between
machine output and hours worked. However, this is purely an observation and somewhat
subjective, therefore further study is required.
Correlation
To calculate r, click on the Tools drop down menu and select Data Analysis; highlight
Correlation and then click OK. In the Input Y Range insert ‘C2:D13’. The output to the
analysis is provided in Figure 12.8.
that Column 1 has a perfect correlation with Column 1 and similarly Column 2 has a
perfect correlation with Column 2. This is because the analysis calculates the correlation
of a variable with itself as well as with that of another variable.
It is important to be reminded of the old adage ‘lies, damn lies and statistics!’ This is
because spurious relationships can be found between two completely unrelated variables,
for instance, there may apparently be a strong correlation between tin food sales and
construction output. It is therefore advisable to ensure that a logical thought process is
followed before attempting the analysis similar to the above example of the site engineer.
Having determined that one variable predicts another, the next phase of work could be to
develop an equation (model) to represent the relationship between the two variables and
make a prediction. Linear regression analysis is a popular method employed to achieve
this and simply uses one predictor, the independent variable (x), to predict values of
another dependent variable ( y). There are two popular types of regression analysis
commonly used; these are, linear bivariate regression and multivariate regression. Both
methods can be learnt with limited a priori knowledge.
• y is the dependent variable (i.e. the one that requires prediction); in the previous
example this was machine production output.
• a is the y axis intercept.
• b is a coefficient that represents the gradient of the line that best fits the given data.
• x is the independent variable (i.e. the predictor); in the previous example this was hours
worked.
Example 12.2
Using the production data from Figure 12.5 the regression model equation can be
determined. To conduct the analysis click on the Tools drop down menu and select Data
Analysis and then Regression, then click OK. In the Input Y Range (machine output; the
dependent variable) insert ‘C2:C13’and in the Input X Range (hours worked; the
independent variable) insert ‘D2:D13’. Also ensure that the Residuals box is ticked
before clicking OK as this will then allow calculation of both the predicted values for the
series as well as the difference between actual and predicted (the residual). Data output is
presented in Figure 12.10.
The resulting equation (resulting from cells B17 and B18 ‘coefficients’) is expressed
as:
This equation needs some additional explanation because the constant coefficient is
negative (i.e. −28,590.5193) and therefore, in the event of work stoppage (and thus no
hours worked), the prediction would be −28,590.5193m3. This is clearly nonsense. This
model is therefore limited to making predictions for production data where between 130
and 185h have been worked (as per the 12 months data utilised). Values either side of
these minimum and maximum values would have to be scrutinised in further detail to
ensure that predictions are realistic.
To determine whether the model makes reliable predictions of machine production,
the R square value (cell B5), more commonly abbreviated to r2, is examined. The r2 is
referred to as the coefficient of determination and represents the square of the correlation
coefficient (cell B4). Thus the r value 0.97 ‘cell B4’ squared equals the r2 value 0.94 ‘cell
B5’. This is an important statistic since it calculates what proportion of the variation in
machine output can be predicted by changes in hours worked. Thus, it may be interpreted
that 94 per cent of the variation in machine output can be predicted by changes in the
value of hours worked.
where
• y is the dependent variable.
• a is the y axis intercept.
• bi is a coefficient that represents the gradient of the line that best fits the given data.
• xi is the independent variable.
• bn and xn represent the opportunity to add further variables and thus coefficients to the
analysis.
Example 12.3
sought to determine those variables that produced the best prediction with the minimum
amount of computational effort.
An example of the data is provided in Figure 12.11; although to obtain the complete
source data and associated analysis, readers are advised to consult the original manuscript
published in Engineering, Construction and Architectural Management (details are
provided in the bibliography).
To conduct the analysis a similar procedure to that used to calculate bivariate
regression is used. Click on the Tools drop down menu and select Data Analysis and then
Regression, then click OK. In the Input Y Range insert ‘A2:A71’ and in the Input X
Range insert ‘B2:D71’. This will ensure that the variables in columns B, C and D are
entered into the analysis. As per the previous example, ensure that the Residuals tick box
is highlighted before clicking on OK. Data output from this analysis is presented in
Figure 12.12.
The resulting equation (resulting from cells B17 to B20 ‘coefficients’) is expressed as:
The r2 value, 0.88, reveals that the model is a good predictor of machine cycle time and
could be used to estimate machine cycle time.
Certain types of data are monitored and collected over regular time periods, for example,
company profits, maintenance expenditure, fuel consumption and so forth. Such data are
used to observe the changing patterns or trends throughout a series of given time periods
and can be predicted to determine the future direction of the trend. There are various
methods by which to predict a time series. The two that will be discussed here are the
complementary techniques of autoregression and moving averages. These techniques can
utilise quite complex multiple variables (multivariate analysis) or mono variables
(bivariate analysis). For the purposes of simplicity, bivariate examples are given.
Autoregression
Autoregression can be used on time series data where the time series variable is related to
itself. Therefore, the time series yt (the dependent variable) is regressed on past values in
the series itself, that is, yt−1, yt−2,…,yt−x (the independent or predictor variable). The
autoregression equation can be expressed mathematically as:
where
• b0 is a constant.
• b1 and b2 are the autoregression coefficients.
• yt−1 and yt−2 are the previous two values of the time series trend.
This particular equation is more accurately called a second order autoregressive equation
because it uses two lagged predictor variables at time yt−1 and yt−2. However in
Opertional planning of equipment as a resource 237
mathematical terms any order can be used, hence the common convention refers to an nth
order autoregressive equation, for example:
This technique is of particular use when forecasting short to medium range forecasts
(normally one–four years) and when the series is not extremely volatile (i.e. where data
values are erratic). For volatile series a more detailed analysis technique such as an
Autoregressive Integrated Moving Average (ARIMA) model may be required or
transformation of the data before applying the technique. Both of these are not considered
any further in this work, but further and more detailed information can be found in
Chatfield (1996).
Example 12.4
Records of the monthly downtime rate for a wheeled loader operating within the civil
engineering industry have been recorded. Twenty-four monthly observations were
recorded during the years 2000 and 2001 (refer to Figure 12.13).
To conduct the analysis click on the Tools drop down menu and select Data Analysis
and then Regression, then click OK. In the Input Y Range insert ‘C5:C25’ and in the
Input X Range insert ‘D5:F25’. Columns D to F (yt−1, yt−2 and yt−3) represent
where the origin is year 2000 (month 4) and Y units=1 month. To test whether the
equation is a significant predictor, the highest order coefficient must be tested; in this
example, this is b3. By convention the test is expressed as: H0: b3=0 (b3 is not a
significant predictor) against H1: b3≠0 (b3 is a significant predictor).
This is achieved by dividing the value of the coefficient b3, from cell B20, by the
standard deviation (standard error) of the coefficient (SDb3) from cell C20. Hence, the
test statistic (t) is as follows:
Using a 0.05 level of significance, the two-tailed t test with 17 degrees of freedom (Cell
B13) has a critical value t17 of ±2.1098 (taken from statistical tables). Because
t=0.01273<2.1098, the upper-tailed critical value under the t distribution and because the
p-value of 0.9001 (Cell E20)> =0.05, we do not reject H0 and conclude that the third
order parameter of the autoregressive model is not significant and can be deleted. Further
and more definitive guidance on this test can be obtained from Levine et al. (2000).
Opertional planning of equipment as a resource 239
Despite this result a second order model may prove to be more robust. The analysis is
reconducted using the same methodology as before but this time including only cells
‘D5:E25’; hence, creating a second order autoregression model. Figure 12.15 presents the
output from the reconducted analysis. The second order model is expressed
mathematically as:
where the origin is year 2000 (month 3) and Y units=1 month. It is immediately apparent
that the model coefficients are significant predictors with p-values of 5.77E−06 (i.e.
0.000000577) and 0.020214< =0.05.
However, the t statistic also reveals that the model should not be simplified further:
The final interpretation of the results is largely subjective and dependent upon the
knowledge and experience of the analyst. However, for this example it is reasonable to
assume that the downtime rate of a machine is cyclical in that it increases and then
decreases as major overhaul works are conducted.
where
• MAn is the moving average (n) model.
• Y is the independent variable observed at points one to n.
• n is the number of observations taken.
Therefore, a three-period moving average would be represented as:
Example 12.5
Figure 12.16 provides details of a civil engineering firm’s profits over a period of 24
years (1977–2000). The finance department needs to make a prediction of future
company profits using bivariate regression analysis but has revealed that the trend in
profits is erratic and thus apparently unpredictable (refer to Figure 12.17).
In an attempt to smooth this trend, the MA3 (3p), MA4 (4p) and MA5 (5p) year period
trends are plotted and examined.
For the calculation of the 3p trend, enter the formula =sum(B2:B4)/3 in cell C4, and
replicate for all Column C cells. Similarly, for the 4p and 5p trends enter the formula
=sum(B2:B5)/4 in cell D5 and =sum(B2:B6)/5 in cell E6 respectively and replicate for
other cells in columns D and E. The resulting trends are plotted in Figure 12.18.
Opertional planning of equipment as a resource 241
Modelling data using the aforementioned techniques reveals that from a statistical
perspective, a reasonable prediction of future trends can be made. However, prior to
utilising such a model in the development of the operational plan, the performance of the
model must be analysed and a judgement made as to how accurate the predictions are.
This will engender confidence that use of the model developed will produce a reliable
and robust forecast. An accepted method of performance analysis is to undertake an
analysis of the residuals; where a residual value is the difference between the actual and
forecasted value. This can be achieved using various tests amongst which are the Mean
Absolute Deviation (MAD) and the Mean Absolute Percentage Error (MAPE). Note that
some other tests look for compliance with statistical prerequisite requirements (e.g.
normality in parametric models) these are beyond the scope of this book.
Opertional planning of equipment as a resource 243
where: e is the error, y is the actual value and n is the sample size. For example, if a
machine production forecast estimated 200 tonnes of topsoil to be excavated and yet only
190 were excavated then the absolute percentage error would be:
Therefore the error for this prediction is 5 per cent of the actual value. The MAPE is the
sum of the absolute errors over the range of predictions made. With both MAPE and
MAD there is nothing precluding the use of median values as opposed to mean. Indeed,
for skewed distributions, the median value is the preferred measure of central tendency.
Judgement
Having vigorously tested the scientific validity of the results, managers will be
confronted with the decision regards whether, or not, to accept the model and its
predictions. Under this situation, the manager’s qualitative judgements provide a
sufficient base upon which to accept or reject the model. Judgement value (i.e. the extent
to which the individual judgement can be trusted) largely depends upon the extent of a
manager’s experience and success. Often, models and performance analysis are judged
on the consensus of opinion of a group of experts from various operational areas within
the company (e.g. purchasing, finance, contracts, plant management and so forth) so as to
ensure a diverse and in-depth knowledge base. Any modelling estimates made are then
adjusted for any anticipated changes (events) that may impact upon model accuracy. The
main strengths of model validation by judgement are that it is comparatively inexpensive
to conduct, it communicates predictions throughout the company and commits
Management of off-highway plant and equipment 244
management to them and it combines the very best features of intuition and scientific
forecasting.
Gantt charts
Having obtained accurate models of the various types of data collected (maintenance
costs, machine production and so forth) the organisation’s operational plan for plant
management can be devised and implemented. To ensure that this plan is adhered to and
monitored adequately requires the use of planning techniques. These may include:
programming networks such as Performance Evaluation and Review Techniques (PERT),
Line of Balance and so on. However, the most widely used technique within plant
management practice is the Gantt chart (named after the American inventor H.L. Gantt)
because of its simple construction and ease of interpretation.
Gantt charts consist of a series of bars located on a ‘time line’ chart. Each bar
represents an activity (e.g. fixed-time-to maintenance work), a duration (hours, days or
weeks) to complete that activity, a start date and an expected completion date. Progress of
the activity may then be monitored to ensure that it is completed on schedule. A logical
relationship is established between activities by the use of links, normally represented by
arrows. There are four types of activity link. These are:
1 Start, finish (SF) where an activity starts when its predecessor finishes.
2 Finish, finish (FF) where two activities must be completed at the same time.
3 Start, start (SS) where two activities commence at the same time.
4 Finish, start (FS) where an activity must be completed when its predecessor
commences (seldom used).
These links indicate precise interrelationships between activities. It is important that
activities are plotted in a logical and practical sequence so that each activity follows in
the correct order. It should also be noted that it only takes one activity to be completed
late for the whole works to be disrupted and delayed. Figure 12.19 presents a simple
Gantt chart, produced using Microsoft Project for the overhaul of a hydraulic excavator.
Ten ‘main’ activities (or task names) are shown, each with a given duration, start date
and finish date. Using a combination of knowledge acquired from previous maintenance
works conducted, statistics and intuition the plant manager must first estimate the
duration of each activity. At this stage, care should be taken to ensure that some time
allowance is made for unexpected problems that may occur such as mechanic
absenteeism, shortage of parts and consumables or identification of additional works that
may be required. It is far better to set a reasonable duration and achieve it than set an
ambitious duration and fail to achieve it! Once these durations have been reliably
estimated, the plant manager must then:
1 Establish the order and manner in which the works are to be undertaken.
2 Identify activities that must be completed within a given time and are constrained by
other activities (in strict interlocking sequence). This sequence of activities is aptly
called the critical path and must be completed on time in order for the whole project to
be completed on time. Any delay in completing critical path activities will result in
project delay.
Opertional planning of equipment as a resource 245
3 Determine activities that have a degree of latitude in time (i.e. they can be completed
within a given time frame). This additional time allowed to complete an activity is
commonly known as the float.
Logical links between the activities can then be made (refer to Figure 12.20) and a
reliable programme of works carefully prepared.
At the outset of this chapter, information was highlighted as being of the utmost
importance to the development of an effective ‘plan’. Once the plan has been
implemented, information is again required to judge its effectiveness, that is, if it has
achieved the desired objectives and has been-accurate. Elements upon which the plan
should be assessed include:
1 Its user-friendliness for both managers and employees.
2 The attention to detail covered and whether all eventualities were considered.
3 The relative success of the plan as measured by its ability to meet desired objectives,
that is, did it work.
4 The inherent flexibility and stability of the plan. For example, was the plan expressed
and defined clearly (stability) and did the plan allow flexibility in the light of changing
circumstances? This may include incorporating contingency plans to supplement
existing plans.
An effective monitoring mechanism is required to measure the relative success (i.e. when
compared to previous plans) of each of the above elements. This is not a difficult task,
once relevant performance measures have been established, and is primarily a clerical
activity. Nevertheless, a person or department (entity) within the organisation should
have a clear, delegated responsibility for quality. Further, it is important that the entity is
connected to the production and/or operations department. This is because the ‘watch
dog’ nature of quality control can cause friction within the organisation and possibly lead
to morale and cooperation problems. For example, change in operations management can
be perceived by line managers as interference and thus resented. In turn, line managers
may positively resist change ‘improvements’ and actively seek to undermine them.
The performance method of measurement used is dependent upon the nature and
purpose of the plan, for example, is the plan concerned with finance, production, human
or material resources? Regular dissemination of the plan’s performance ensures natural
stability and continuity of the plan. This can be easily achieved using the open
architecture feature found on many commercially available software packages, e-mail,
the internet or a mixture of all three.
Chapter 13
International operations
Introduction
Logistical problems
A remote region usually implies locations in uninhabited territory and sparsely populated
areas lacking basic infrastructure and utilities, such as good transport networks and
communications. However, unfamiliar conditions can occur almost next door, resulting
from different languages, and political, economic or historical developments.
Nevertheless, in general, operations will mainly involve changed geography, climate, and
legal and/or unaccustomed social practices. The ‘comfortable’ home arrangements of
immediate deliveries, spares ‘off the shelf’, ready advice and abundant experienced staff,
etc., are unlikely to be available.
Many of the logistical problems to be faced in supplying and operating equipment in
remote regions are common to well-developed societies but usually require considerably
more management effort. Typically, wrong decisions and choices do occur and, as a
consequence, already overstretched resources become exacerbated, the situation being
further compounded by scheduling, ordering, despatch and, especially, delivery delays.
Indeed, systems designed for a developed home market often break down when exposed
to the vagaries of the different communications and infrastructure of a foreign
environment. Other difficulties commonly arise through the need to raise or receive funds
in a foreign currency, which sometimes may not be readily acceptable to the Foreign
Exchange market. Also, import controls and customs regulations can be complicated and
very restrictive, particularly regarding imported spare parts and especially where the host
country claims to have its own manufacturing capability.
Obtaining the right personnel to both manage and operate equipment may prove
difficult. Indigenous staff often require considerable training, both in the skills for the job
International operations 249
itself and in communicating with the home base and systems of the company, including
the need to converse in a foreign language. Expatriates often predominate at supervisory
levels and, unless highly paid, thoroughly selected and prepared for the foreign
environment, are unlikely to perform satisfactorily. Furthermore, having to cope with
local customs and practices commonly borders on corruption and can become very
distorted unless entrusted to very reliable staff.
More specifically, unfamiliar communication facilities, such as telephone systems,
postal services and even radio transmission, can lead to frustration and errors. Regarding
equipment itself, inexperienced staff can inadvertently cause extra maintenance,
increased breakdowns and failures, etc., further compounded by damages to equipment in
transit, either through bad roads and transport or even lack of adequate inspection of
imports at source. Also, extra quantities, especially of spare parts, may need to be
ordered, to avoid stock shortages. Furthermore, overseas work frequently exposes
inefficient manufacturers and suppliers, with many unprepared for dealing with
unfamiliar logistics and markets.
Equipment requirements
Support items
The types of equipment needed to execute an overseas project will clearly depend upon
the nature of the work. However, support facilities can be more specifically mentioned
and would typically include:
1 Concrete batching and mixing equipment.
2 Transport vehicles, such as trucks, four-wheel Land Rovers, utility vans and wagons.
3 Welding and fabrication shops, equipped with welding and burning gear, workshop
equipment, grinders, etc.
4 Maintenance workshops, for plant and vehicles, together with spare parts stores.
5 Power generators, including a standby water storage tank, fuel dumps, etc. A water
treatment capability might also be necessary.
6 Waste disposal facilities for sewage, for example, septic tanks and incinerators. Indeed,
on large long-term sites proper sewage treatment equipment may be worth installing.
7 Furnished site offices, canteens, stores and compound, plant yard. Many sites will also
need to provide furnished accommodation for some of the work force, which might
have to be quite elaborate for expatriates, including recreational facilities.
Equipment in general
Wherever possible, the equipment acquired or designed for an overseas contract should
be versatile, with the capacity to change one duty for another, for example from tractor to
carrier. Standardisation can assist here in facilitating switching and cannibalisation.
Sensitive equipment generally needs protection from the heat or cold, dust, humidity,
wind and other climatic conditions, with instruments requiring special attention,
particularly during transport. Temperature-sensitive materials should be kept under
controlled conditions in cold storage or air-conditioned rooms.
Management of off-highway plant and equipment 250
Above all, regular maintenance is essential, even to the extent of regularly turning on
mechanical and electrical components to keep moving parts free. A plentiful supply of
stocks of consumables, such as steel plate, structural steel pieces, pipework, hosing and
other fittings, is clearly necessary besides normal plant spares, and, above all, a well-
protected and well-policed stores is essential. Evidence indicates that about 10–15 per
cent of equipment value in spares is usually required as stocks where the local market is
relatively economically unsophisticated/underdeveloped. Furthermore stock requirements
may fluctuate markedly over a contract, and therefore a good-size initial supply is
prudent until usage patterns have been ascertained. Local supplies may be available but
could be inferior if not manufactured in one of the major industrial countries. This whole
question impacts on maintenance, since, if the major manufacturers of equipment have no
service backup in the country, either local fitters, electricians, mechanics and technicians
have to be trained, or imported expatriates have to be employed at considerable expense.
In either case, decisions regarding provision of appropriate spares and workshops must be
carefully thought out.
While many of the above points affect the selection of equipment and the arrangements
needed to effectively manage and operate, other factors such as supply, packaging,
transport, agents, customs, finance, insurance, and so on, are equally important.
Pre-shipment inspection
Equipment is commonly specified to certain standards – for example, ISO, EN, BS, DIN,
etc. and for the EU, CE marking of equipment plus much other certification – with local
clients insisting on pre-shipment inspections being charged to the supplier, to ensure that
the conditions are met before items leave the source country. The procedures requested
may involve simply counting of items and dimensional checks, or more thorough
inspections, including testing of materials, components and complete items of equipment,
in accordance with the particular specification standard. Other aspects could include
monitoring the export price against like items sold on the home market.
Transport to site
Transport over long distances through unfamiliar territory and other countries en route
clearly needs special attention and planning. Wherever transit periods exceed several
months and different means of carriage, strong packaging and preferably containerisation
is necessary. The choice of transport method itself depends upon several factors – for
example, roads, while generally economically competitive, usually involve long journey
hours and can be fraught with problems, such as poor road surfaces, lack of signposting,
pilferage, banditry, and unreliable drivers and/or haulage firms. Also, when at journey’s
end, special temporary roads may need to be constructed, especially for the very remote
construction site.
International operations 251
Alternatively, shipment over long sea routes, while generally cheap, is very slow but is
commonly preferred for large plant items, to avoid disassembly demanded by container
sizes. However, even with shipping, containerisation needs link-ups with trucks for ease
of handling. A further consideration is the quality of facilities at the inloading port.
Increasingly, rail transport is becoming competitive over long distances especially where
national rail systems are well organised – for example, Trans-Siberia, Trans-Canada and
systems in parts of Africa and Europe.
Air freight is usually the quickest means of transport but also the most expensive.
Heavy or bulky items are usually unsuitable, with large units often needing
disassembling. Occasionally very specialist transport can be considered, such as
helicopters, and even more exotic means such as snowmobiles, pack animals and so on.
Finally, the courier should not be overlooked for small items facilitating considerable
shortening of customs delays.
Equipment purchased direct for overseas contracts usually requires the organising of
import licences and, of course, the mechanisms of payment. Furthermore, the plant may
have to be fully depreciated during the contract and simply left in the host country,
although in some countries small markets for the sale of second-hand equipment exist.
Notably import priorities in developing countries are commonly solved by rationing
through a waiting list, sometimes tempered by importance of use of the currency, for
example equipment over consumer goods. Some transactions in local currency may be
Management of off-highway plant and equipment 252
available via the foreign exchanges, but for very poor or ill-managed economies, few
opportunities exist to exchange ‘hard’ (i.e. Euros, dollars, pounds, etc.) for ‘soft’
currency, since such currency can really only be used to make purchases in the local
economy. Some international bartering may be possible, and today organisations
specialising in exchanging commodities for consumer and capital goods do exist.
Much difficulty can be avoided when projects are funded by aid agencies such as the
World Bank, United Nations, Bi-Lateral aid agencies, etc.; here a soft loan is usually
involved – that is, a loan in a hard currency with low interest rate or easy payment terms,
with the stipulation being sourcing of equipment from a particular country. Finally,
import duties should not be overlooked – national agreements may have been negotiated
through the WTO (World Trade Organisation), regional economic national groupings etc.
Also, some countries waive the import duty if the equipment is to be re-exported at the
end of its duties.
Conclusion
Clearly, when embarking on any overseas contracts, obtaining knowledge about the
likely conditions to be faced is vital. Advice is available in the home country through
government export agencies, trade associations, research & development organisations,
shipping agents, private consultancy firms and so on. However, reconnoitring the local
environment is paramount and in addition, for many countries, local agents, distributors,
contacts, etc., are absolutely essential. In some cases forming partnerships or joint
companies may be justified in order to secure knowledge of: (1) legal, financial and
banking procedures; (2) import legislation, quality specifications and standards; (3)
customs, shipping, delivery and distribution procedure and (4) maintenance expertise and
labour management.
Part IV
Financial and budgetary
control
Chapter 14
Budgetary control and costing
Introduction
Preparation of budgets
The budgetary system comprises many individual budgets which are ultimately integrated
into a master budget. The master budget (Table 14.1) is similar in format to a profit and
loss account but, unlike the latter, is based on forward estimates of costs and revenues
and is therefore only a forecast of the anticipated profit to be earned. From such an
estimate other factors related to future expectations may be projected, such as the rate of
return on capital employed, dividends to shareholders, capital to be retained in the
business for reinvestment in assets and similar items related to profitability.
At the start of any attempt to prepare budgets for business activity during the coming
year, it is first necessary to prepare a budget for the investments to be made in plant and
equipment, since it is through these assets that revenues and costs are mostly generated.
Subsequently, a sales and operating budget may be synthesised and the cash flow
requirements determined. By a gradual process of reiteration budgets are modified to
keep within the constraints on financial resources available, culminating finally in the
master budget, as shown in Figure 14.1.
Table 14.1 Master budget
Management of off-highway plant and equipment 256
Types of budget
Sales budget
The sales budget for a rental or hire business is simply the forecast of revenues from
equipment hire. This will be made up of the expected income from the hire of individual
items, which may fluctuate on a seasonable basis. Consequently, the budget should be
prepared showing the anticipated annual and weekly incomes.
Operating budget
The operating budget is prepared from estimated costs of the planned requirements for
items such as:
• materials, for example, fuel, lubricants and spare parts;
• staff and labour;
• equipment such as small tools;
• depreciation of workshop equipment;
• business facilities, rent, rates, electricity, etc.
The difference in value between the sales and operating budgets is the anticipated profit
before deduction of depreciation of the assets, such as equipment and buildings, etc., for
the year ahead.
The operating budget, when appropriate, is subsequently subdivided into separate
functions (see Figure 14.2). These may include budgets for departments such as transport,
workshop and administration. In larger concerns the latter could be broken down further
into hiring, sales, costing, accounts and purchasing. By providing each department with a
separate financial budget, a target is available against which subsequent performance may
be monitored. Examples of the form of the annual budgets for the workshop, transport
and administration functions are shown in Tables 14.2–14.4. It can be seen that the
budgets consist of cost forecasts of the requirements for materials, labour and expenses.
A coding system is used to allocate the resources to particular departments or functions
Management of off-highway plant and equipment 258
concerned, and like items are collected under the same alphanumeric code. It is usual to
present both
Classification of costs
For the preparation and monitoring of budgets, costs are collected and classified into the
major functions: hiring, purchasing, workshop, transport, costing,
administration/personnel, accounting. Within these functions the costs may be further
collected into cost centres. For example, each item of equipment maintained by the
workshop may be given a code number which may represent the cost centre of one or
more similar items. The costs recorded for each cost function or centre may be
subdivided into elements such as materials, labour and expenses:
1 Material cost: consumables and spares.
2 Labour cost: wages and salaries of the employees.
3 Expenses: depreciation of plant and equipment, repairs, administration, services
provided, water and electricity.
The costs of materials, labour and expenses which can be clearly allocated to a cost
centre are called direct costs, and usually vary with the volume of production or
equipment usage. Indirect costs are those materials, labour and expenses which cannot be
directly identified to the cost centre, but which provide some function or service, such as
a computer or the rent of the firm’s offices and works. Indirect costs are thus apportioned
between the cost centres, and are usually referred to as overhead costs.
Budgetary control and costing 261
Indirect costs are mostly fixed costs such as staff salaries, rent and rates, insurances,
office equipment, maintenance tools and machines, which remain constant irrespective of
the volume of trading or work done. A direct or variable overhead is one which varies in
cost with the volume of production, such as electricity.
Costing
While budgets are prepared from predetermined costs, because of short-term changes in
business performance it is essential that the actual costs incurred be continuously
monitored and compared with budgeted costs in order that changes may be implemented.
The difference between the actual cost and the predetermined cost is called a variance. A
costing system should be updated regularly on a weekly basis, and the variances
calculated for each function, department or cost centre. The procedure may also include
analysis of the variances incurred by the individual items of plant in the fleet.
A note of caution with regard to the budgets, particularly departmental budgets, is
advised. It is useful to compare the actual result with the value for the same month or
week of the previous year. Astute managers can be adept at ‘hiding’ behind a
‘camouflaged’ budget which may have fortuitously arisen through changed
circumstances, for example, reduction in the assumed rate of inflation, manipulation of
the figures, etc. Managers’ performance should therefore be measured against both the
budget and the previous year’s results.
Example 14.1
The annual budget for a plant workshop is £100,000 (see Table 14.2). This figure is based
upon the size of the fleet and the estimated hours that the fleet will be operated during the
year.
The budgeted direct costs of the department consist of the purchase of consumable
materials and spare parts and labour such as fitters, mechanics, etc., and these total
£80,000. Budgeted indirect costs include staff salaries, rent, rates, insurances, general
administration charges, depreciation of workshop equipment and power. These amount to
£20,000 and are a fixed charge.
At the end of the year business activity had been lower than expected and the hours
operated by the fleet were 10 per cent fewer than initial estimates. The actual direct costs
of the workshop over this period were £70,000 and the actual cost of overheads was
£21,000. The position is provided in Table 14.5.
Thus, although the level of activity anticipated at the beginning had not been realised,
the works department had managed to maintain a favourable variance on direct costs. In
this example only overheads produced an unfavourable variance and a more detailed
analysis of costs should reveal the reasons, such as excess secretarial staff. However,
Management of off-highway plant and equipment 262
because the volume of business had not reached the level anticipated, the budgeted profit
for the enterprise also would not be fully recovered and the costs of the fixed overheads
would have to be met from the reduced profits. For a plant hire business such
consequences could be particularly severe, as much of the business costs are generated as
fixed overheads. For a comprehensive review of performance, therefore, the sales
variance should be included in the analysis.
Sales variance
Example 14.2
The budgeted hire revenue from equipment over the coming 12 months is £400,000.
Profit, overheads and depreciation are set at 10 per cent, 20 per cent and 20 per cent
respectively, of revenue. However, the actual revenue was only £350,000. The variances
recorded for direct and indirect costs (overheads) were, respectively, + £3,000 and +
£1,000. In addition, several items were written off prematurely, leading to a negative
variance on equipment depreciation of £1,000.
Analysis of variance
Sales variance = −£25,000 (i.e. 50% of £400,000−£350,000)
Direct costs variance = +£3,000
Indirect costs variance = +£1,000
Depreciation variance = −£1,000
Actual shortfall on = £22,000 (i.e. £18,000 profit as compared to £40,000 budgeted
profits profit).
It can be seen that the profit and overhead is under-recovered by £25,000 and only the
collective economies made by the various departments reduced the magnitude of the
shortfall to £22,000.
Budgetary control and costing 263
Analysis of variance
1 Utilisation variance is the financial effect of using the equipment either more or less
than those hours budgeted. Thus:
2 Price variance is the financial effect of charging more or less than the budgeted hire
rate. Thus:
The sum of the utilisation and price variances multiplied by the profit and overhead
margin is the true sales variance on the item.
Example 14.3
During the month an item of equipment was hired out for 280hours at a hire rate of £12
per hour. The budget anticipated only 200hours of work at a hire rate of £13 per hour.
Calculate the utilisation and price variances. The profit (and overhead) is set at 10 per
cent of the hire rate.
1 Utilisation variance on sales
(favourable)
2 Price variance on sales
(unfavourable)
Sales variance=(actual revenue−budgeted revenue)×profit and overhead margin
The effect of operating the equipment 80hours more than planned increased the
revenue by £1,040, but reduce to £760 because the hire rate was less favourable than
Management of off-highway plant and equipment 264
budgeted. The variances should be cumulatively totalled for each month, to present a
comprehensive record, which together with records collected of the hours operated for
the machine, provides an indication of the competitiveness and excessive use or
otherwise of the item.
These two variances signify to the management the popular and competitive
equipment items to operate, and the information is therefore valuable in deciding upon
purchases and disposals.
Example 14.4
During a six-month period £4,000 revenue was received for a piece of equipment. The
budget anticipated £5,000. Direct costs and indirect costs (overheads) from operating the
various departments of the enterprise were budgeted to the item at £1,500 and £2,000
respectively, with profit at 10 per cent of turnover, and £1,000 was provided for
depreciation. Actual direct costs recorded during the period were £1,250 and the actual
overhead incurred was £1,950. Calculate the variances and percentage return on sales.
Analysis of variance
Budgeted profit (10% of £5,000) = £500
Sales variance (£1,000×70%) = −£700
= −£50
Direct cost variance
Overhead variance = +£50
Depreciation variance = £0
Total variance = −£700
Actual profit on turnover =
Note: Sales variance multiplier of 70 per cent is derived from profit, overhead and depreciation –
that is, (£500+£2,000+£1,000)/£5,000.
dispose of items at prices which are economic for the company. For many firms this type
of information is monitored on an asset register of the equipment holdings.
Marginal costing
Marginal costs are those costs arising directly from the production process, which for an
equipment hire business would be largely those costs connected with maintenance and
servicing of the equipment. They therefore vary directly with the hiring activity. Fixed
costs, arising from the establishment charges, fluctuate very little with hiring levels. The
purpose of the marginal costing method is to calculate the contribution made by each
item of equipment for hire towards the fixed costs and profit of the business. For an
example of marginal costing refer to Table 14.6.
This technique can be used to advantage during a short-term period when the market
demand is low and hire rates need to be keen to attract custom, the contention being that
any hire rate revenue which exceeds the marginal costs makes a contribution towards the
fixed costs. However, such a pricing policy should be considered only during a short and
difficult period, since the endeavour must be to realise the budgeted profit for each item
over
Table 14.6 Marginal costing
Plant item, £00s (weekly)
A B C D E
Hire revenue 10 9 5 15 10
Labour costs 3 2 2 5 2
Material costs Marginal costs 3 2 1 5 3
Expenses 2 2 1 3 2
Contribution* 2 3 1 2 3
Contribution per £1 revenue 20p 33p 20p 13p 30p
Note
* Contribution=overheads+profit.
the 12-months periods. Thus, for plant item C, for example, a hire rate exceeding £400
per week will contribute to the fixed overhead, which may be a better alternative than
leaving the machine idle. Conversely, the method gives a clear indication that the firm
should be directing its sales effort on items B and E, as these machines can obtain
favourable hire rates and give the best contribution towards fixed costs.
Chapter 15
Cash flow
Introduction
Bankruptcy or voluntary liquidation is caused not only by a lack of cash, but also by an
inability to raise cash in the form of loans or credit to meet immediate commitments,
because creditors, investors and possibly lenders of money – usually the banks – have
lost confidence in the business and are not convinced that the company can continue to
trade in a profitable and viable way. This loss of confidence is an important factor
because it is the existence of such confidence that permits overdrafts to be obtained and
normal trade credit to be received, and a loss in confidence would result in existing
creditors pressing harder for payment. Trade credit is an important factor in determining
most companies’ short-term cash requirements and should trade credit be withheld, the
short-term cash requirements increase significantly. The withholding of trade credit
simply means that the suppliers to a company demand cash on delivery rather than
invoicing, say, at the end of the month and requiring payment one month later.
Most of Chapter 6 was concerned with profitability measured in terms of return on
capital, and much of Chapter 16, dealing with financial management, will be concerned
with determining the company’s profit and distributing that profit. Profit, seen simply as
the difference between revenue and cost, is a common measure of a company’s well-
being, and the derived ratios of profit/turnover and profit/capital employed are useful
indicators of the company’s performance, but these are derived from measuring profit.
Undoubtedly, a company with a good profit is likely also to have good profitability (i.e.
profit as a proportion of capital employed) and, in turn, be in a good state to avoid
liquidity problems. But the company’s liquidity also needs to be monitored and managed.
Although a company may be profitable, it may have liquidity difficulties. An unexpected
demand for payment might not be possible to be met and may cause significant
difficulties, if not bankruptcy.
The more detailed monitoring and managing of a company’s cash flow can be seen as
two related and integrated but different aspects. One is the cash required for normal
trading operations and the other is the cash required for acquisitions, less disposals.
The cash required for normal trading operations is controlled by sales fluctuations,
trade credit (creditors, less debtors), stocks, work in progress and perhaps value added tax
(VAT). In equipment hire, sales fluctuations are manifest by the utilisation of equipment.
Equipment is idle in a sales slump, but all equipment is highly utilised and more new
equipment is required in a sales boom. Stocks in equipment hire are less important than in
manufacturing and normally only represent spares, repair materials, fuel and oil. Also,
equipment hire companies differ from manufacturing companies in that there is no
manufacturing process absorbing manpower and materials and locking up cash. The
nearest equivalent to ‘work in progress’ in equipment hire is equipment on hire for which
the invoices have not been issued, or perhaps equipment under repair.
The other aspect is the cash required for the provision of the company’s capital assets.
This is particularly important to equipment hire companies, since as much as 50 per cent
Cash flow 267
of sales turnover may be used in meeting the costs of asset ownership. The variables that
control this are the purchase and disposal of capital assets, the method of acquisition
which, in turn, controls the methods of payment (e.g. purchase, hire purchase or lease)
and the company’s ability to utilise capital allowances. In addition to these factors, the
company’s cash flow is also affected by interest and other bank charges, corporation tax
and dividends. Corporation tax is important to the cash flow, as at the time of writing,
capital allowances of 25 per cent of the purchase price written down are allowed in
acquiring an asset, such as an item of construction equipment. Therefore, the disposal and
acquisition of equipment is significant when determining the corporation tax due and, in
turn, the acquisition of equipment and payment of corporation tax are significant to the
company’s cash requirements. Dividends are also significant to the company’s cash
position, but within the control of the company’s directors.
The following description of cash flow problems reflects the two main aspects of cash
flow: (1) the cash flow resulting from the normal month-to-month trading operations and
(2) the cash flows resulting from the acquisition and disposal of capital assets. These will
be considered separately.
Example 15.1
An equipment hire company initially holds five items of equipment which are hired out at
the rate of £1,000 per month. Each month’s maintenance on each item of equipment uses
£200 in spare parts and £100 in consumables such as fuel, oil and grease. The fuel costs
for running the equipment are the responsibility of the hirer. The workshop providing the
maintenance support has sufficient labour to maintain five items of equipment in working
order each month. The labour cost of the workshop is £750 per month. If all the five
Management of off-highway plant and equipment 268
items of equipment were on hire and all the transactions were in cash, the monthly cash
flow would be as follows:
Month 1 (with all transactions in cash)
Cash out (£) Cash in (£)
Sales (5 items of equipment on hire) 5,000
Workshop labour 750
Purchases
Spares for 5 items of equipment for 1 month 1,000
Consumables for 5 items of equipment for 1 month 500
Totals 2,250 5,000
Net cash flow for month 1 +£2,750
Contribution to company for month 1 +£2,750
The contribution is defined as the revenue derived from the hire sales, less the direct costs
incurred in supporting these sales, such as labour, spares and consumables. The company
profit will be the contribution, less the ownership and overhead costs. If the hirers were
given trade credit of one month to pay, then the cash flow for month one would be as
follows.
Month 1 (with trade credit for hirers)
Cash out (£) Cash in (£)
Sales (5 items of equipment on hire) nil
Workshop labour 750
Purchases
Spares for 5 items of equipment for 1 month 1,000
Consumables for 5 items of equipment for 1 month 500
Totals 2,250 nil
Net cash flow for month 1 −£2,250
Contribution to company for month 1 +£2,750
The company has the same contribution but the effect of trade credit to the hirers
produces a net cash flow of −£2,250. If the suppliers of spares and consumables also
offered one month trade credit but the labour was paid weekly, the cash flows would be
as follows.
Month 1 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (5 items of equipment on hire) nil
Workshop labour 750
Cash flow 269
Purchases
Spares for 5 items of equipment for 1 month nil
Consumables for 5 items of equipment for 1 month nil
Totals 750 nil
Net cash flow for month 1 −£750
Contribution to company for month 1 +£2,750
Thus, although the contribution generated in this month was again £2,750, the cash
resources required were reduced to −£750 by the availability of trade credit from
suppliers. Assuming that this is the normal trading experience, the cash flows in the
following month, month 2, will be different from those in month 1, even though the same
level of sales (i.e. hired-out equipment) is achieved. This is because the cash flows from
month 1 sales and purchases will be present.
Month 2 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (5 items of equipment on hire) nil
Workshop labour 750
Purchases
Spares for 5 items of equipment for 1 month nil
Consumables for 5 items of equipment for 1 month nil
Revenue from previous month’s sales 5,000
Payments for previous month’s purchases
Spares 1,000
Consumables 500
Totals 2,250 5,000
Net cash flow for month 2 +£2,750
Contribution to company for month 2 +£2,750
In month 2 the cash flow is a net inflow of +£2,750, arising from the revenue from month
1 sales. The contribution earned in month 2 was again £2,750 and the cash flows and
contributions for the two months are:
Cash flow (£) Contribution (£)
Month 1 −750 +2,750
Month 2 +2,750 +2,750
Management of off-highway plant and equipment 270
Provided that the five items of equipment are hired out and maintained each month, the
cash flows and contributions will continue as in month 2. If in months 3 and 4 only two
items of equipment are hired out, the pattern is disturbed, as follows.
Month 3 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (2 items of equipment on hire) nil
Workshop labour 750
Purchases
Spares for 2 items of equipment for 1 month nil
Consumables for 2 items of equipment for 1 month nil
Revenue from previous month’s sales 5,000
Payments for previous month’s purchases
Spares 1,000
Consumables 500
Totals 2,250 5,000
Net cash flow for month 3 +£2,750
Contribution to company for month 3 +£650
Number of idle items of equipment 3
(The contribution is calculated as the revenue from two items of equipment of £2,000,
less the workshop labour of £750, and the spares for two items of equipment of £400 and
consumables for two items of equipment of £200.)
Although the sales in month 3 were reduced, the effect was not shown immediately on
the cash flow because of trade credit. The reduction in contribution generated in the
month is aggravated by the fact that the labour costs could not be reduced in a similar
way, as the purchases were reduced to levels compatible with the reduced sales. A serious
problem of reduced sales not shown here but which will be dealt with later is that the
ownership costs of the idle equipment still have to be met from the reduced contribution.
The effects of reduced sales revenue come through in month 4.
Month 4 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (2 items of equipment on hire) nil
Workshop labour 750
Purchases
Spares for 2 items of equipment for 1 month nil
Consumables for 2 items of equipment for 1 month nil
Revenue from previous month’s sales 2,000
Cash flow 271
Thus, the smaller sales revenue from month 3 has reduced the net cash inflow from
£2,750 to £650.
If in month 5 the sales improve to four items of equipment on hire, the improved cash
flows again take a further month to come through, as months 5 and 6 illustrate.
Month 5 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (4 items of equipment on hire) nil
Workshop labour 750
Purchases:
Spares for 4 items of equipment for 1 month nil
Consumables for 4 items of equipment for 1 month nil
Revenue from previous month’s sales 2,000
Payments for previous month’s purchases
Spares 400
Consumables 200
Totals 1,350 2,000
Net cash flow for month 5 +£650
Contribution to company for month 5 +£2,050
(Contribution=sales−workshop labour−spare−consumables)
Number of idle items of equipment 1
The cash flow in month 6 reflects the increase in sales experienced in month 5.
The cash flow and contribution for the first six months of this venture are therefore:
Month 1 2 3 4 5 6
Net cash flows −£750 +£2,750 +£2,750 +£650 +£650 +£2,050
Contribution +£2,750 +£2,750 +£650 +£650 +£2,050 +£2,050
It is clear from this table that the contribution more closely reflects the fluctuating sales,
whereas the effects of trade credit produce different cash flows.
So far the company has been purchasing just enough spares and consumables for each
month’s operations, but if it wished to build up stocks of spares and consumables, then
the cash flows would be reduced in order to fund the stocks. Months 7 and 8 are
examples of building up stocks to meet a future sales boom.
Month 7 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (4 items of equipment on hire) nil
Workshop labour 750
Purchases
Spares for 8 items of equipment for 1 month nil
Consumables for 8 items of equipment for 1 month nil
Revenue from previous month’s sales 4,000
Payments for previous month’s purchases
Spares 800
Consumables 400
Totals 1,950 4,000
Cash flow 273
In month 7 spares and consumables for eight items of equipment were purchased,
although only four were required to support the sales in the month. The four purchased in
excess are held in stocks, as shown. Contribution is calculated on the revenue and cost of
the sales.
Month 8 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (4 items of equipment on hire) nil
Workshop labour 750
Purchases
Spares for 8 items of equipment for 1 month nil
Consumables for 8 items of equipment for 1 month nil
Revenue from previous month’s sales 4,000
Payments for previous month’s purchases
Spares 1,600
Consumables 800
Totals 3,150 4,000
Net cash flow for month 8 +£850
Contribution to company for month 8 +£2,050
Number of idle items of equipment 1
Stocks:
Spares for 8 items of equipment for 1 month £1,600
Consumables for 8 items of equipment for 1 month £800
Thus, the build-up of stocks has reduced the cash flow to +£850.
To meet the expected sales boom, the company increases the total holding to eight
items of equipment. In order to service this, additional labour is required, which brings
the workshop labour cost to £1,800.
Month 9 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Management of off-highway plant and equipment 274
The increase in sales has led to a negative cash flow, because the sales have led to
increased trade credit which will not show as cash inflows until the next month and the
increased workshop costs had to be met immediately. Also, the level of purchases of
spares and consumables was high in month 8 and cash must be found to fund the stocks.
Cash flow for month 10 will improve as the increased revenues come through. Such rapid
expansion could, if continued, lead to overtrading in which the company’s cash resources
would not be sufficient to support the expansion.
Month 10 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (8 items of equipment on hire) nil
Workshop labour 1,800
Purchases
Spares for 8 items of equipment for 1 month nil
Consumables for 8 items of equipment for 1 month nil
Revenue from previous month’s sales 8,000
Payments for previous month’s purchases
Spares 1,600
Cash flow 275
Consumables 800
Totals 4,200 8,000
Net cash flow for month 10 +£3,800
Contribution to company for month 10 +£3,800
Number of idle items of equipment nil
Stocks
Spares for 8 items of equipment for 1 month £1,600
Consumables for 8 items of equipment for 1 month £800
The cash flow in month 10 now reflects the higher revenue of the sales in month 9. If in
month 11 some of the stock held is used to maintain equipment rather than buying new
spares and consumables, the cash flow would further improve in month 12.
Month 11 (with trade credit for hirers and from suppliers)
Cash out (£) Cash in (£)
Sales (8 items of equipment on hire) nil
Workshop labour 1,800
Purchases
Spares for 4 items of equipment for 1 month nil
Consumables for 4 items of equipment for 1 month nil
Revenue from previous month’s sales 8,000
Payments for previous month’s purchases
Spares 1,600
Consumables 800
Totals 4,200 8,000
Net cash flow for month 11 +£3,800
Contribution to company for month 11 +£3,800
Number of idle items of equipment nil
Stocks
Spares for 4 items of equipment for 1 month £800
Consumables for 4 items of equipment for 1 month £400
Although eight items of equipment were on hire, spares and consumables were only
purchased for four. The remaining required spares and consumables were taken from
stock and the value of the stock was reduced.
Month 12 (with trade credit for hirers and from suppliers)
Management of off-highway plant and equipment 276
The cash flow increases to £5,000 in month 12 when the revenues are £8,000 due to the
high sales in month 11 and payments for purchases are only £1,200 because half the
spares and consumables used in month 11 were drawn from stock rather than purchased.
This is known as de-stocking. The cash flows and contributions are summarised in Table
15.1. Summary of the difference between cash and contribution in Table 15.1:
• The cumulative contribution for the 12 months is £27,400.
• The cumulative cash flow for the 12 months is £23,400.
• The difference between these is due to the trade credit and stocks.
Trade credit
Creditors
Outstanding credit received from suppliers
Spares £800
Consumables £400
£1,200
Debtors
Outstanding credit given to hirers
Cash flow 277
Stocks
Spares £800
Consumables £400
Total £1,200
Net cash –750 2,750 2,750 650 650 2,050 2,050 850 –200 3,800 3,800 5,000
flow (£)
Of the £27,400 of contribution earned, the company has: £23,400 in cash (less overheads
and ownership costs, etc.); £2,800 in debtors less creditors; and £1,200 in stocks.
The cash flows calculated in Table 15.1 were calculated on the basis of trading
operations and require further adjustment before they represent the company cash flow.
These other adjustments are head office or overhead expenses, the acquiring and disposal
of capital assets, value added tax, corporation tax and dividends.
Overheads
Management of off-highway plant and equipment 278
Adjusting the cash flows and profits for overheads requires a projection of the head office
overheads. Some of these expenses, such as salaries, will be monthly; others, such as
telephone, electricity and rentals, may be monthly or quarterly; while business rates may
be half-yearly. Table 15.2 shows the original contribution and cash flows from Table 15.1
with the overhead adjustment included.
The overhead projections in Table 15.2 are as shown. These have been stated in the
month in which they occur, and the same figure in any month has been deducted from the
contribution as well as the cash flow. The difference between the cumulative contribution
of £27,400 and the cumulative cash of £23,400 is due to stocks and the difference
between debtors and creditors, as previously explained. The effect of overheads is simply
to reduce the contribution and cash available.
Table 15.2 Summary of profit and cash flows for 12
months with overheads included
Month Contribution Cash flow Overheads Contribution Cash flow
before overheads before (£) less overheads less
deducted (Table overheads (£) overheads
15.1) (£) deducted (£)
(Table 15.1)
(£)
1 2,750 −750 150 2,600 −900
2 2,750 2,750 10 2,740 2,740
3 650 2,750 40 610 2,710
4 650 650 10 640 640
5 2,050 650 10 2,040 640
6 2,050 2,050 190 1,860 1,860
7 2,050 2,050 10 2,040 2,040
8 2,050 850 10 2,040 840
9 3,800 −200 40 3,760 −240
10 3,800 3,800 10 3,790 3,790
11 3,800 3,800 10 3,790 3,790
12 1,000 5,000 40 960 4,960
Cumulative 27,400 23,400 530 26,870 22,870
values
Depending on the difference in value between the amount of goods bought and sold in a
quarter, the VAT can result in an outflow or an inflow. If the VAT is owed by the
company, the collection of VAT has been acting as a source of short-term funds. If a
VAT refund is due to the company, then the company has been funding the difference,
and the effect of VAT on the company’s cash flow should be calculated.
Trade credit
Equipment hire companies give and receive credit. The credit given to customers is
typically one month, so that any equipment hired this month will have an invoice issued
at the time of supply and payment will be expected in, say, 30 days. In preparing a cash
flow forecast from the sales forecast, the cash in, or revenue, can be derived by inserting
the appropriate time shifts between the month in which the sales occur and the month in
which the cash is received. In deriving revenue, it is usual to assume that not all the
customers will pay on the due date and that some will default. An analysis of the timing
of receipts from customers will indicate which assumed time shifts are appropriate.
Representative figures would show that 70 per cent of customers pay within one month,
25 per cent within two months and 5 per cent within three months. It may be that
payment is never received on some invoices, and this should be taken into account in the
cash forecast if this proportion is significant. Thus, a sales forecast and derived cash in or
revenue would be as illustrated in Table 15.3.
Similarly, credit would be received from suppliers of spare parts and consumables,
and from the forecast of required spare parts, repair materials and consumables the
appropriate time shifts would be used to determine the cash out. Labour and operatives
would be paid weekly and the staff monthly.
under-utilised or hired out at an uneconomic rate, or both, quickly cease to give a return
on capital. In such a situation companies would try to dispose of their equipment, but in a
market slump this may not be possible. This is the basic risk in all equipment hire
operations.
Forecasts
A short-term cash flow forecast is derived from the sales forecast and the aggregate cash
requirements of all the various heads of account, divided into purchasing supplies, goods,
labour, staff and overheads. The heads of account are the same as those used in the
budget – namely workshop, transport and the various service departments of purchasing,
administration, costing, hiring and finance. A tabular flow forecast may be constructed as
illustrated in Table 15.4.
One feature of equipment hire companies that distinguishes them from general
contractors is the high proportion of funds locked up in their capital assets. As much as
40–50 per cent of the sales revenue may be dissipated on the ownership costs of the
company’s assets. The cash flow for the normal month to month trading as in Tables 15.2
and 15.4 should be combined with the company’s capital expenditure budget, which
includes disposals as well as purchases, to produce the cash flow statement.
As the capital expenditure budget is likely to produce the larger cash flows and will
dominate the company cash flow, it is not unusual for the capital expenditure budget to
be prepared first.
The method of acquisition determines the cash flows for individual items and Chapter
6 reviewed the various methods of acquisition: outright purchase, credit purchase, hire
purchase or lease. All have different cash flow implications, and the cash flows of these
various methods of acquisition can be summarised as follows:
Method of acquisition Cash flow
Outright purchase Single large down payment
Credit purchase Deposit plus regular payments
Hire purchase Deposit plus regular hire charges
Lease No deposit but regular lease payments
Thus, leasing is the least difficult to provide for, because it should be paid from revenue.
Hire purchase or some credit arrangement is the next easiest, since a down payment is
Management of off-highway plant and equipment 282
required and the remaining charges can be met from revenue. However, the down
payment may be borrowed and the loan repayments met from revenue. Similarly, outright
purchase requires a large single payment of cash, but all of this or part of it can be
borrowed and payments can be met from revenue.
Providing a cash flow statement that includes the effects of acquisition and purchasing
requires a prediction of the proceeds received from disposals together with a forecast of
the expenditure on acquisition divided into down payments, hire purchase or loan
repayments, interest charges and lease payments. The following example has been chosen
so that it may be included with the cash flow calculated in Table 15.2.
Example 15.2
Of the five items of equipment initially acquired by the company, three were leased and
two were bought on hire purchase. The outright purchase price of the plant items is
£5,000. The lease payments are £270 each per month for 24 months. The HP deposit on
one plant item is £1,000 and the monthly payments are £385 for 12 months. In month 8,
when the plant holding was increased to eight units, this was done by selling one of the
plant items bought by hire purchase for £4,000, paying the HP company £1,320,
representing the outstanding HP payments, less the interest that would be charged for the
remaining period of four months. The fleet was increased by a further four leased items at
a cost of £270 per month each. The cash flows for these acquisitions and disposals are
shown in Table 15.5. Cash flow for acquisitions and disposal is now added to the cash
flows for normal trading from Table 15.2 and is shown in Table 15.6.
Value added tax has previously been described. Interest charges will be due if the
negative cash flow is funded from loans or an overdraft, and corporation tax will be due
after all costs and interest have been deducted from sales revenue. The time lags
associated with corporation tax will vary from about nine months to perhaps 24 months,
and the payments due would be for the previous trading years. Dividends would be paid
out on the decision of the board of directors and are determined by the company’s cash
position, among other factors.
To complete the equipment hire company’s cash flow forecast the analysis that was
suggested in Table 15.4 needs to be extended as in Table 15.7.
Aspects that perhaps need further explanation are the recovery of the capital monies
invested in equipment through hire charges and the implications of corporation tax.
capital and an appropriate return on that invested capital. Thus, the monthly sales revenue
includes this depreciation allowance. In the cash flow calculations undertaken in this
chapter no attempt has been made to link the depreciation allowance included in the hire
charges with the monies to be paid in ownership costs such as HP, loan repayments or
lease payments. Although in calculating hire rates
and that the monies available to meet ownership costs are depreciation plus retained
profits.
Table 15.5 Cash flow for acquisition and disposal
of equipment
Month 1 2 3 4 5 6 7 8 9 10 11 12
Equipment
acquisition
5 items, 25,000
value
(£)
3 items 15,000
by lease
(£)
2 items 10,000
by HP
(£)
Lease 810 810 810 810 810 810 810 810 810 810 810 810
payments
(£)
HP 2,000
deposit (£)
HP 770 770 770 770 770 770 770 770 385 385 385 385
payments
(£)
Equipment 4,000
disposal
(£)
HP 1,320
settlement
(£)
Equipment
Management of off-highway plant and equipment 284
acquisition
4 items, 20,000
value
(£)
4 items 20,000
by lease
(£)
Lease 1,080 1,080 1,080 1,080 1,080
payments
(£)
Total cash 3,580 1,580 1,580 1,580 1,580 1,580 1,580 3,980 2,275 2,275 2,275 2,275
out (£)
Total cash 4,000
in (£)
Net cash –3,580 – – – – – – +20 – – – –
flow (£) 1,580 1,580 1,580 1,580 1,580 1,580 2,275 2,275 2,275 2,275
Adjustments to this cash flow that would render it a true company cash flow would be for VAT,
interest, corporation tax and dividends.
Profit is not calculated in this way for tax purposes, as capital allowances are used to
offset the cost of acquiring capital assets (see Chapter 16). Furthermore, the partitioning
of the sales revenue in this way unrealistically suggests that the part of the revenue
described as ‘depreciation’ is unnecessarily limited to be used in meeting ownership
costs.
The reason that the sales revenue was left unpartitioned is that the funds can be
deployed in any way to suit the company’s operations. If the need is to meet the funding
of debtors due to increasing sales or stocks or to buy a new item of equipment the surplus
of revenue over cost can be deployed in the most advantageous way to suit the company.
The company’s need for cash is the criterion which dictates the use to which that cash
available is put. The original method of calculating the hire charge which made
allowances for depreciation was only a method of arriving at a realistic hire charge and
has no influence on how the income is used. Thus, the cash flow analysis recommended
in this chapter does not partition the revenue under the heading used to calculate the
original hire charges.
The implications of corporation tax also need to be understood in the context of the
depreciation element of sales revenue. If a company buys a capital asset for £1,000, UK
tax legislation allows this to be offset against tax at the rate of 25 per cent written down
and in that year tax is charged on the remaining profits. In the first year this amounts to
£250, to be set against tax. In the subsequent year 25 per cent of the remaining capital
sum of £750 (i.e. £187.50) is set against tax and so on. The company’s internal
depreciation included in the hire charge is unlikely to recover the capital in exactly the
Management of off-highway plant and equipment 286
same way or at the same rate. It may be that the company recovers the capital over three
years including one-third of the capital in each year. Thus, in the year of purchase, if the
company’s profits were £1,200 (i.e. sales revenue less costs), the taxable profit would be
£950, less interest charges, which is £1,200, less the capital allowances. If, in the next
year, the company’s profits (sales revenue, less costs) were £1,300, the taxable profit
would be £1,112.50, less interest charges. As explained in Chapter 6, the method of
acquisition influences the capital allowances. The internal depreciation included by the
company in their hire charges has no bearing on the calculation of taxable profit.
The corporation tax implications from the three methods of acquisition – outright
purchase, hire purchase and leasing – can be summarised as follows:
Method of Implications for corporation tax
acquisition
Outright A capital allowance of 25 per cent written down of the purchase price can be set
purchase against profits.
Hire purchase A capital allowance of 25 per cent written down of the purchase price can be set
against profits. The interest element of the HP charge is deductable from
revenue before tax.
Leasing No capital allowance is available but lease payments are deductable from
revenue before tax.
Interest charges Interest charges on loans and overdrafts are deductable from revenue before tax.
Thus, the method of acquisition which may be chosen for cash flow reasons has a bearing
on the corporation tax due, which, in turn, affects the company’s cash flow. The benefit
of capital allowances can be derived only if there are adequate profits against which the
allowances can be set.
This chapter has dealt with explanations of how and why cash flows vary and the need to
forecast cash requirements. There has been an accompanying implication that the cash
flow can be managed, which is so within limits. The variables of sales fluctuations, the
amount of credit given, level of stocking, when to dispose of capital assets, when to
acquire capital assets and by what method they should be acquired are all subject to some
managerial control. However, there are limits.
Sales fluctuations
It is theoretically easy in an expanding market to control sales growth and, hence, the
increase in debtors. However, increasing sales may be difficult to resist but are likely to
be restricted if this means acquiring more capital assets. It is more difficult to improve
sales in a declining market: cutting hire charges may be an option but this could lead to
unprofitable trading. Thus, if a major slump in the construction industry occurs, some
Cash flow 287
equipment hire companies will inevitably cease to trade. A slump in the construction
industry is out of the control of equipment hire companies.
Trade credit
The amount of trade credit is set by the general trading conditions, and if a company sets
shorter credit periods than competitors, the company may lose customers. Thus, trade
credit is not wholly within the company’s control. However, vigorous credit control can
ensure that invoices are not allowed to remain unpaid for long periods beyond the normal
credit given. A credit control system is a very important feature of a company’s cash flow
management. The company’s credit controllers have some control, in that credit can
always be refused if the customer is deemed unworthy of the risk.
With respect to the credit received from suppliers, it is unlikely that a company could
extend the normal credit arrangements without losing discount and jeopardising
confidence in the company. Confidence is important in obtaining credit, overdrafts and
loans.
Stocking
The level of stocks of spare parts, repair materials and consumables is a matter for
equipment companies to decide. The equation that is being balanced is the cost of holding
such stock against the risk of equipment remaining idle while spare parts are sought.
Risk
Another need for cash that has not been considered so far is access to cash to cover risk.
It is possible to plan for routine maintenance and, drawing on experience, it is possible to
plan for repairs within reason, but it is not difficult to imagine situations where expensive
repairs are required unexpectedly. The option of delaying repairs until cash becomes
available is usually an undesirable situation, as this leaves the equipment item idle and
ownership costs accrue whether the item is idle or not. Consequently, unexpected and
expensive repairs often need to be undertaken immediately, and provision for such
situations must be made. This implies the ready availability of cash for equipment not
covered by an engineering insurance policy, and the ready availability of cash could
suggest that cash may be idle and not working unless invested in short-term investments.
Management of off-highway plant and equipment 288
Introduction
An equipment hire or rental concern, like any other, usually has limited liability status,
with either private or publicly quoted shares (PLC), depending upon its ability to secure a
quotation on the Stock Exchange. A limited company, irrespective of its size, must file its
annual financial accounts with the Registrar of Companies. To ensure that these give a
true and fair view of the company’s trading position, they are subjected to an annual
audit by an independent firm of approved professional accountants. If the enterprise, on
the other hand, is a subsidiary or department of a parent company, its trading position
need only be included generally in the controlling company’s consolidated accounts.
Beyond these legal requirements the financial accounts provide a basis for measuring
the profit made by the company and its overall financial performance during the year
past. In addition, the accounts give information on the investment policy, borrowing and
other details of interest to shareholders (the owners), other investors and creditors. In the
annual report, the main items presented are the Profit and Loss Account, the Balance
Sheet and notes to the accounts.
The Profit and Loss Account is a statement of the company’s total profit or loss resulting
from trading during the year. Its main features are the revenues generated from sales
together with the costs incurred in producing the sales. The difference between the two
values represents the profit or loss. After deduction of interest charges on borrowed
capital and corporate tax, the resulting surplus is used to provide a dividend to
shareholders and/or for reinvestment in the company as retained earnings.
Example 16.1: Profit and loss account for the current year (including
capital allowances)
£000s
Turnover (revenue)
Hire of equipment and services 16,500
Costs
Materials, labour, expenses (including depreciation), overheads 14,500
Management of off-highway plant and equipment 290
Turnover
The company’s turnover is the total value of sales of goods and services during the year,
before costs are deducted. For a hire company or division this sum represents the total
payments invoiced to clients for equipment hired or rented.
companies having the same gross profit of £450, one favouring the use of capital
allowances (Table 16.1), and the other not (Table 16.2). In both cases, they buy an item
of plant worth £1,000, which is written off in equal amounts over four years. In both
instances, the total tax paid is £280, but with Company 2 this has been deferred.
In practice it is apparent that many hire companies try to avoid paying this deferred tax
by continuing to buy new equipment: year four in the second example shows what could
occur if such continual buying ceased. In this case, the company would be liable to
payment of taxes in excess of the net profit earned for the year. Therefore, not only do
capital
Table 16.1 Company 1: not using capital
allowances
Year 1 Year 2 Year 3 Year 4
Profit before depreciation 450 450 450 450
Depreciation 250 250 250 250
Net profit 200 200 200 200
Tax at 35% 70 70 70 70
Profit after tax 130 130 130 130
Note
Total tax paid by Company 1=£280.
allowances provide a carrot, but also a stick. A company could, in certain circumstances,
be effectively trapped in the system by a slow, almost undetected, build-up of tax
liabilities.
Management of off-highway plant and equipment 292
Interest charges
Loan capital, other than shareholder’s equity, usually incurs an annual interest charge. In
effect, this represents an indirect cost on the business and is deducted as such from net
profit for the calculation of corporation tax payment.
The function of the balance sheet is to portray the financial position of the company on a
specific date – for example, 31st December of the current year. Because time is needed to
prepare the Balance Sheet information, the details could change just before or
immediately after publication, for example, settlement of an account by a debtor. The
balance sheet is a ‘photograph’ of a particular financial position, whereas the profit and
loss account shows the record of achievement throughout the year.
The Balance Sheet is usually presented in tabular format separating capital employed
from employment of capital. Alternatively, some companies prefer liabilities and assets
to be clearly separated on different pages. In either case, the two sets of measures must
balance exactly. Thus, for example, any increase in cash must be counterbalanced by a
Financial management 293
decrease in some other asset or, alternatively, by an increase in liabilities. This principle
applies throughout.
Using information given in the previous example together with the following company
details, the Balance Sheet at 31 December may be prepared as follows:
Depreciation
Cumulative up to 1 January PY 6,000
Provided for in PY (agreed with Tax Inspector) 2,000
8,000
Net book value at 31 December PY 20,000 20,000
Loan capital
Short-term loans are usually classified with current liabilities, but medium- and long-term
loans are placed with the capital employed. Loans may take several forms, of which
debentures and loan stock form the most important sources. Such lenders of capital are
creditors of the company, and not owners as are shareholders.
Long-term/medium-term finance
Long-term finance is that capital required for 5–10 years, either to start the business or to
carry out expansion programmes. Broadly, the capital is used to purchase buildings, plant
and equipment and to carry stocks of materials. The risks to the lender are high because
of the time scale involved and, consequently, only established firms are generally
considered by the lending institutions. Some of the more important sources of long-term
capital are shown in Figure 16.1.
Loans are not easy to obtain. Lenders of such capital often request the borrower to
provide a proportion of the finance from internal sources and, in addition, require
convincing evidence that the loan capital can be secured against an asset with profitable
expectations.
Short-term finance
The firm, when established, often needs short-term capital to overcome immediate cash
flow problems. Materials have to be purchased, equipment hired, labour and
subcontractors paid, and so on before payment is received for the finished product or
service. Furthermore, capital may be required to smooth out the strains on cash flow
resulting from rapid fluctuations in the market demand for the company’s goods. Many
sources of short-term finance are available to ease the situation, but naturally the firm
must be well managed and profitable before the lending institutions will consider any
loan application. The main sources are shown in Figure 16.2, but the clearing bank
overdraft facility is the most important source. However, a leasing facility from a finance
house is also an important source of either long- or short-term funding of plant
acquisitions. The method is described in Chapter 6 and operates more like a rental
payment than a loan.
Sources of most types of capital, their advantages and disadvantages and the costs
involved are summarised in Table 16.3. Table 16.4 illustrates capital acquisition methods
used by typical construction companies.
Working capital
Working capital is represented by the difference between current assets and current
liabilities and is locked up in a continuous cycle, as shown in Figure 16.3.
A construction company owns and operates equipment, grouped into a separate division
responsible for generating its own turnover in the market place. The turnover of this
division is £20 million pounds per year, broken down as 45 per cent plant ownership
costs, 15 per cent for materials and 10 per cent for wages for maintenance and transport,
Financial management 297
20 per cent for overheads incurred in maintaining the depot establishment and
administration facilities; and 10 per cent profit. On average, the company keeps three
months’ material spares in stock and is allowed three months credit by suppliers: wages
are paid weekly. Hirers of the company’s equipment (i.e. debtors) are usually allowed up
to two months to pay. Overheads must
Table 16.3 Summary of capital sources
Source Finance Advantages Disadvantages Costs
Bank Overdraft (1) Usually cheapest (1) Subject to changes in (1) Floating interest
source government economic policy charge at base rate
plus 1–4 per cent
(2) Quickly (2) Repayable on demand (2) May incur
arranged commitment fee
(3) Flexible (3) Subject to changes in
bank policy
(4) No minimum (4) Tempting to use for
funding long-term
(5) Renewable
(6) Interest paid
only on usage
purchases
(7) Sometimes
available unsecured
Bank or Short-term (1) Term (1) Generally more (1) Floating interest
finance loan commitment by expensive than overdraft charge at base rate
house loan institution plus 2–5 per cent
(2) Competition (2) Term commitment and
between lending funds may therefore be idle
houses, especially if forecast for funds
for hire purchase inaccurate
(3) Relatively (3) Tends to require security
quickly arranged against other assets
(4) Can be used in
conjunction with
overdraft facility
(5) Sometimes
available unsecured
Finance Hire (1) Inexpensive and (1) Expensive (1) Interest fixed at
house purchase specially arranged time of negotiations
facility at finance house base
rate plus 4–5 per cent
(2) Payments fixed (2) Subject to government
Management of off-highway plant and equipment 298
charge can
sometimes be
negotiated
Such capital needs would usually be financed by means of an overdraft negotiated with a
bank or, alternatively, with private funds. However, it can be seen that if equipment had
been purchased with internal funds rather than by hire purchase, the working capital
needs would be £0.75 millions less. The equivalent sum would then remain in the
business and offset the working capital needs.
Ratio analysis
The main short-term techniques for managerial control are cash flow forecasting,
budgetary control and costing, described in Chapters 14 and 15. Unfortunately, however,
they provide absolute figures which are of marginal value in monitoring the long-term
profitability and short-term liquidity of the company. Regular internal ratio analysis using
the financial accounts offers a complementary post mortem to these standard procedures.
2
Most accountants look for ratios of 2:1 and 1:1, respectively. Using the Balance Sheet
given earlier, it can be seen that:
In this hypothetical company the current ratio (CR) is a little low and the acid test (AT) a
little high. This situation could be improved by increasing stocks by million and
Management of off-highway plant and equipment 302
reducing creditors and debtors, respectively, by £1 million and million, to give the
following values:
3
The turnover ratio can provide telling information about the capital structure of the
company. For example, the plant hire company is more similar to manufacturing with its
turnover ratio approaching 1, whereas with most construction companies the ratio is more
often nearer to 6, the difference being accounted for by the high capital investment
required in plant. The ratio could, of course, be increased by leasing rather than owning
equipment.
Other ratios
This means that customers are given nearly three months to pay.
4
Financial management 303
Capital gearing
Capital gearing is defined as the ratio of fixed return capital (FRC) to ordinary share
capital, FRC being preference shares, debentures and loan stock. A company with a ratio
exceeding one is described as a highly geared company. When a company can expect
confidently to make a constant level of high profits over a number of years, then it is wise
to raise some of the capital by means of debentures or loan stock and so improve the
yield to the ordinary shareholder. Such a technique is known as leverage, and the effects
are demonstrated in the following example.
Example 16.4
The capital structures for two plant hire companies are given in Table 16.5 and the profits
available for interest payments and dividends for a range of company performance levels
are given in Table 16.6.
1 Calculate and comment on the capital gearing ratios for each of the companies.
2 Calculate the dividend available to the ordinary shareholders and comment on the
earnings per share at each level of profit. Corporation tax is 50 per cent.
Table 16.5 Capital structures
Company X Company Y
(£1,000) (£1,000)
Ordinary shares (£1) 310 70
7% Preference shares 90 90
10% Loan stock (debentures) — 240
Low-geared High-geared
Plant profitability
It has been argued that plant can be more advantageously organised as a profit centre and
not on the service principle. This is best illustrated by the following example.
Example 14.5
Profit expressed as a
percentage on turnover
employed and the company is typical of the construction sector in that capital is turned
over eight times per year, whereas for plant the turnover ratio is unity or thereabouts.
If plant, for instance, had made only £0.5 millions profit, then, for the company as a
whole, construction would have to make £0.7 millions profit, or 4.375 per cent on
turnover, to achieve 6 per cent overall on turnover. Thus, any shortfall in plant
profitability requires a monumental effort from other business to redress the balance.
Introduction
Payroll
Within the off-highway plant and equipment sector payroll requirements are complicated
because of the diverse nature of trading enterprises (owner-operators, plant hire
companies, civil engineering contractors and so forth). Very few enterprises pay all their
employees on the same basis: instead there is a mixture of remuneration by piecework,
and hourly, daily or weekly wages, as well as monthly salaries.
Management of off-highway plant and equipment 308
purposely designed and suitable for equipment companies. The applications that come in
this group are reviewed as follows.
Asset register
Assets accounting deals with assets which, usually, have a long lifespan, extending over
several accounting periods. Computer programs for assets accounting provide, at any one
time, (1) an assets register with straightforward information on what assets the company
has, and where they are; (2) their written-down value, and depreciation to date; and (3)
their replacement cost.
Information provided on the replacement cost is perhaps the most valuable, as it forms
the essential test on the wisdom, or otherwise, of the depreciation policy being adopted.
Most asset register systems offer a range of depreciation methods, including straight line
and declining balance.
Thus, reports from asset register systems include:
• A list of plant items grouped by type of equipment.
• Inventory numbers.
• Value.
• Depreciation to date by usual methods.
• Depreciation for this year.
Separate reports will include technical details of each item of equipment held.
The importance of an asset register for the equipment company is that it maintains
detailed information relating to the items of equipment held in a form that supports the
production of the company accounts and in a form that allows managers to consider their
depreciation and disposal policies. The depreciation policy is particularly important to an
equipment company, because the depreciation element, or capital cost, forms as much as
50 per cent of a hire rate. The purchase and disposal of equipment is equally important to
the continued well-being of a company.
Equipment reports
The equipment hire company requires its own set of management reports to inform the
company managers and to allow them to take the various day-to-day decisions.
The management reporting systems dealing with the equipment include:
• Weekly hire charges.
• Period hire charges.
• Equipment locations.
• Revenue and cost reports.
Management of off-highway plant and equipment 310
Equipment locations
Equipment location reports record the current location of equipment on hire and the
length of time at that location. The location of idle equipment is also monitored in reports
of this type.
Stock control
In equipment management, stock control relates mainly to the supply of spare parts and
consumables. The purpose of keeping stock is to supply the fleet with the items it needs,
but this need must be tempered with economy. Overstocking causes locked-up capital but
Information technology in equipment management 311
understocking may cause a repair to be delayed and involve expensive downtime. Good
stock control aims at achieving a balance between overstocking and understocking. Stock
recording and control systems monitor stock issues and delivery notes, and perform stock
taking and prompt reordering when minimum levels of stock of a particular item are
reached.
Stock control systems are usually linked to purchasing systems and hold details of the
various suppliers, the purchase order details for the suppliers and the invoices. Stock
control systems offer savings by optimising the level of stock held and holding up-to-date
information on the stocks and reducing the manpower committed to stock taking.
Maintenance records
The maintenance records can be held on computer file for ease of update and reference.
The most significant impact that technology has had on the management of information
resources within the off-highway plant and equipment sector is perhaps in the area of
communications. A catalogue of communication tools that are finding increasing use
within the sector, is described in the following sections.
The Internet
The Internet evolved around the latter part of the 1970s from research originally funded
by the US Advanced Research Projects Agency in the late 1960s and early 1970s.
Today’s Internet is a global resource connecting millions of users in a labyrinth that
comprises a network of computer networks. The Internet is based on a set of rules for
Management of off-highway plant and equipment 312
data exchange called the TCP/IP protocol suite [which stands for Transmission Control
Protocol (TCP) and Internet Protocol (IP)], an agreed method of communication between
all parties associated with the Internet. In one sense, the Internet represents a community
of people who use and develop the isolated computer networks, and provide a collection
of resources that can be reached from those networks on a global basis. Common uses of
the Internet include information sharing, interaction and communication. While the
networks that make up the Internet are based on a standard set of protocols, the Internet
also has gateways to networks and services that are based on other protocols. The value
of the Internet to enterprises that own plant derives from its ability to connect easily and
globally to a vast amount of data, which would otherwise take more time and money to
organise. The following benefits can be gained by exploiting the resources of the Internet.
• Reduced communication costs.
• Enhanced co-ordination and communication.
• Acceleration in the distribution of knowledge resources within and without the
company.
• Promotion and marketing for the company.
The take-up of the facilities available through the Internet by companies has however
been slow. This is due to a number of technological as well as social constraints often
associated with the Internet. They include security concerns, technology issues, legal
uncertainties, and social acceptance by company executives and enterprise owners.
Intranets
An Intranet is a communication infrastructure that is based on the communication and
content standards of the Internet but is internal to an organisation. The tools employed to
create Intranets are identical to those used for the Internet and its applications. The
distinguishing feature of an Intranet is that access to information is restricted to only the
company’s personnel. The development of Intranets was in direct response to the
concerns of business regarding data security on the Internet. Intranets evolved at about
the same time as the Internet revolution commenced. Companies can set up an Intranet to
allow project managers access to data from both central databanks and different projects.
Extranets
An extranet is a network that uses Internet protocols and the public telecommunication
system for communicating both privately and selectively with the user’s customers and
business partners. The technology allows a contractor to securely share part of its
company information resources or operations with suppliers, subcontractors, project
partners, clients or other companies. Extranets therefore, introduce an additional
functionality to Intranets. The main benefit of this technology is the acceleration of
business activities between different companies. Within the larger plant enterprise, the
advantage in deploying extranets derives from a cheaper and more efficient way for
employees and managers to connect with their suppliers, subcontractors and other project
partners. For example, suppliers can receive proposals, submit bids, provide documents,
and in some cases collect payments through an extranet site. Not only does this cut down
Information technology in equipment management 313
on redundant ordering processes and keep suppliers up to date on future deliveries and
design changes, but it also allows quicker response times to suppliers’ problems.
Extranets can be used to exchange large volumes of data, including the sharing of
product catalogues, providing design specifications and details, distribution of news to
trading partners, and collaborating with other contractors on joint project schemes.
Electronic Data Interchange (EDI) is a special form of extranet that can be set up between
a contractor and suppliers.
Electronic mail
Electronic mail (e-mail) is perhaps the most popular use of the Internet. The basic
concepts behind e-mail are similar to that of regular mail. Documents are sent by mail to
personnel in organisations at their particular addresses. In turn, they write back to a return
mail address. Electronic mail however, has a distinct advantage over regular mail, which
is speed. Instead of taking several days, the message can reach the recipient in minutes or
perhaps even seconds (depending on location and the state of the connection to the
recipient). It can be argued that the telephone achieves a similar speed of transmission.
However, the e-mail provides the additional advantage of convenience and a record of
communication. Messages are sent when it is convenient. Equally, the recipients respond
at their convenience. Electronic mails can also be used to transmit documents as an
attachment to messages. By means of e-mail, details of work sections can be exchanged
between designers and contractors.
idea of the Web is to merge the techniques of computer networking and hypertext into a
powerful and easy-to-use global information system. Hypertext is text with links to
further information, on the model of references in a scientific paper or cross-references in
a dictionary. With electronic documents, these cross-references can be followed by a
mouse-click, and within the World Wide Web environment, the references can lead to
anywhere in the world. Electronic documents are similar to the pages of paper
documents. A computer is used to display the pages on its screen. Inside each page
sensitive spots are exploited by the computer to switch automatically from one page to
another when the user clicks on a sensitive spot. This navigation by wandering from one
page to another is called browsing. Figure 17.1 provides a typical browser interface for
accessing the Web. The Web is ‘seamless’ in the sense that a user can see the whole Web
of information as one vast hypertext document. There is no need to know where
information is stored, or any details of its format or organisation. Behind this apparent
simplicity there is, of course, a set of ingenious design concepts, protocols and
conventions that control its manner of working.
The World Wide Web is a hypermedia information and communication system
popularly used on the Internet computer network with data communications operating
according to
a client/server model. Web clients (browsers) can access multi-protocol and hypermedia
information from servers (possibly using helper applications in conjunction with the
browser) by way of an addressing scheme.
Information technology in equipment management 315
Data conferencing
Data conference resources allow interaction between parties only to confer over text and
graphic documents. This technology has already found some applications in construction,
whereby designers located in different geographical regions work on the same drawing
simultaneously.
Another form of data conferencing is Internet Relay Chat (IRC). IRC provides a way
of communicating in real time with people from all over the world. It consists of various
separate networks of servers that allow users to connect to a particular IRC. Generally,
the user (such as you) runs a program (called a ‘client’) to connect to a server on one of
the IRC nets. The server relays information to and from other servers on the same
network. The main disadvantage associated with the IRCs is that it only employs text for
communication.
Video conferencing
In its simplest form, video conferencing is the live connection of two or more people
using some combination of video, audio and data for the purpose of communication, with
video being the only prerequisite to fulfil the definition. Nevertheless, it is helpful to
think solely of the visual impact of the medium from the outset because the roots of how
we communicate with one another predate the development of language. Non-verbal
actions often described as body language, essential for effective communication, are lost
in the absence of visual interaction.
Rapidly developing video conferencing tools are also changing the way projects are
run. Virtual conferencing tools like CU-SeeMe, Microsoft’s Net Meeting and Netscape’s
Collabra are now being bundled with standard computer software packages, and these
tools will enable project teams to collaborate, read on-line drawings and solve problems
without having to travel to the job site. These advancements may help reduce travel costs
and improve project communications.
Electronic commerce
Electronic commerce is employing information technology to improve transactions
between companies. It involves the integration of e-mail and similar technologies into a
comprehensive electronic-based system of business functions. It is based on the
electronic processing and transmission of data, including text, sound and video. It
encompasses many diverse activities including electronic trading of goods and services,
Management of off-highway plant and equipment 316
Throughout the 1960s, the US Navy and Air Force worked on a number of systems that
would provide navigation capability for a variety of applications (e.g. tracking military
vehicles and personnel). However, early systems were largely incompatible with one
another and hence, in 1973, the American Department of Defense sought to unify them
for the US air force. The new system developed was called Navstar Global Positioning
System and was based upon atomic clocks carried on satellites. It has since come to be
known simply as GPS.
Global Positioning System utilises a network of satellites placed into orbit by the
United States Department of Defense. GPS was originally intended for military
applications, but in the 1980s, the US government made the system available for civilian
use. GPS works in any weather condition, anywhere in the world, 24 h a day. The first
GPS satellite was launched in 1978 and a full constellation of 24 satellites was achieved
in 1994. Each satellite is built to last about ten years and replacements are constantly
being built and launched into orbit.
The nominal GPS operational constellation consists of 24 satellites that orbit the earth
in 12 h. The satellite orbits repeat almost the same ground track (as the earth turns
beneath them) once each day. There are six orbital planes (with nominally four satellites
in each), equally spaced (60 degrees apart), and inclined at about 55 degrees with respect
to the equatorial plane. This constellation provides between five and eight satellites that
are visible from any point on the earth.
Information technology in equipment management 317
Global Positioning System satellites transmit signals to GPS receivers on the ground;
GPS receivers passively receive satellite signals; they do not transmit. GPS receivers
require an unobstructed view of the sky, so they are used only outdoors and they tend to
perform poorly within forested areas or near tall buildings. GPS operations depend on a
very accurate time reference, which is provided by atomic clocks at the US Naval
Observatory. This is because, each GPS satellite transmits data that indicates its location
and the current time. All GPS satellites synchronise operations so that these repeating
signals are transmitted at the same instant. The signals, moving at the speed of light,
arrive at a GPS receiver at slightly different times because the satellites are different
distances from the receiver. The distance to the GPS satellites can be determined by
estimating the amount of time it takes for their signals to reach the receiver.
A GPS receiver must be locked onto the signal of at least three satellites to calculate a
2D position (latitude and longitude) and track movement. With four or more satellites in
view, the receiver can determine the user’s 3D position (latitude, longitude and altitude).
Having determined the user’s position, the GPS can calculate other information, such as
speed, bearing, track, trip distance, distance to destination, sunrise and sunset time etc.
The use of GPS is widespread in many fields that require geospatial information for
managing assets over large areas. Forestry, mineral exploration, and wildlife habitat
management all use GPS to precisely define positions of important assets and to identify
changes in machine condition. For example, within agriculture GPS receivers installed
onto farm equipment have provided accurate position information that enables farmers to
apply fertilisers and harvest crops with great precision. GPS is however, becoming
commonplace in off-highway vehicles; basic applications provide emergency on-site
assistance at the push of a button (by transmitting the position of a vehicle to an
emergency response centre). More sophisticated systems can pinpoint a vehicle’s position
on an electronic map display and create a route, giving precise directions. This has been
particularly useful in tracking machines that have been stolen; a major problem for the
off-highway plant and equipment industry. Other examples include fitting GPS to large
dump trucks to provide accurate position information that has been used to increase
productivity and enhance safety through the implementation of driverless, as well as
driver operated, technology.
Appendix: Interest and time relationships
and tabulations for interest rates of 10 and
15 per cent
Cash flows are transfers of money. Positive cash flows are transfers into a project or
scheme, and negative cash flows are transfers of money out of a project or scheme. If a
company purchased an item of equipment, the purchase price and the running costs
would be negative cash flows. The revenue from hire and the resale would be positive
cash flows. Cash flows can be individual lump sums or a recurring series – that is, the
same cash flow recurring each period. The manipulation of both types of cash flow, the
lump sum and the recurring series, is achieved by the use of derived relationships
between interest and time. The derived relationships are tabulated as factors which can be
used to achieve these manipulations. The expressions used to calculate these factors are
given later in Tables A.1 and A.2 for the interest rates of 10 and 15 per cent. The
expressions are also given in the following six examples, which are represented in the
same order as that in which they are tabulated. The expressions are easily incorporated
into computer programs of programmable calculations, and the use of tables is
diminishing.
Compound amounts
If a sum of money, £1,000, is invested for some years – say eight – at an interest rate of
10 per cent, the sum of money that can be withdrawn at the end of that time would be:
The amount 2.1435 is the compound amount factor, taken from the tables or calculated
from the expression (1+i)n, where i is the interest rate 0.1 (for 10 per cent) and n is the
number of years, 8. This process is represented in Figure A.1, to illustrate the reward
received for money loaned or invested.
Appendix 319
Present worth
The inverse of calculating compound amounts is calculating the present worth. If a sum
of money, £2,143.50, is required in eight years’ time the capital sum that would be
required
1 10 and 15 per cent values have been given purely for illustrative purposes only. These rates will
invariably change in time, and from country to country, but the method used in these calculations
will remain valid.
to be invested today to generate this amount, given an interest rate of 10 per cent, would
be £1,000:
The amount 0.46650 is the present worth factor, taken from the tables or calculated from
the expression:
where i is the interest rate and n is the number of years, as before. This expression is the
inverse of the expression for the compound amount factor and the process can be
represented as in Figure A.2, which illustrates that if £2,143.50 is required in eight years,
£1,000 has to be invested now. The £1,000 is said to be the equivalent of £2,143.50 in
eight years, given the interest rate of 10 per cent. Thus, £1,000 in year zero is the same as
£2,143.50 in year eight and the difference of £1,143.50 is the interest earned in the
intervening eight years. This process of converting the £2,143.50 in year eight to £1,000
in year zero is known as discounting. This discounting process is very widely used,
because it provides a convenient method of converting future cash flows to a common
base date and provides a means of comparing cash flows of different magnitude
occurring at different times.
It is important to remember that the present worth of a future cash flow is the capital
sum that would need to be invested today to generate that future sum.
Appendix 321
The amount of 8.753 is the uniform series compound amount factor, taken from the tables
or calculated from the expression:
Each sum is invested for a different period of time, and the compound amount could
be calculated by using the compound amount factor for each of the six individual cash
flows and summing the results. The uniform series compound amount factor allows this
to be done in one step, as illustrated in Figure A.3.
Figure A.3 also shows that the cash flows are included in the calculation at the end of
the year or period in which they occur. This is the assumption on which the expression
was derived and is known as the ‘end of period convention’, which states that all cash
flows take place at the end of the period.
The amount 0.11423 is the sinking fund deposit factor, taken from tables or calculated
from the expression:
where i is the interest rate and n is the number of years. This expression is the inverse of
the uniform series compound amount factor. This factor is used in calculating the monies
to be taken from revenue to repay borrowed capital or to replace plant.
The amount 2.8549 is the uniform series present worth factor, taken from tables or
calculated from the expression:
where i is the interest rate and n is the number of years. It should be noted that the
expression is the uniform series compound amount factor multiplied by the present worth
factor.
Appendix 323
mechanism for comparing invested capital with running costs and thereby evaluating any
possible tradeoffs between them.
Capital recovery
The inverse to the uniform series present worth factor is the capital recovery factor. This
allows the income that can be taken on a regular basis from an invested capital sum to be
calculated. If a sum £285.49 is invested at an interest rate of 15 per cent, then the regular
income that can be taken each year for the next four years is £100:
The amount 0.35026 is the capital recovery factor taken from tables or calculated from
the expression:
where i is the interest rate and n is the number of years. This expression is the inverse of
the uniform series present worth factor.
The importance of this calculation is that it allows the conversion of capital sums into
annual sums. This provides an alternative means of comparing capital with running costs.
For example, if £285.49 is not invested but used to purchase an item of equipment, then
the cost of that equipment item can be regarded as £285.49 or as an annual cost of £100
for four years, the annual cost being set equal to the amount of income that the investor is
deprived of because the capital is locked up in the equipment. This calculation is useful in
comparing hiring with purchasing or in calculating the ‘capital’ element in hire rates.
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variance 242–3;
see also capital cost;
maintenance;
ownership
cost accounting 7, 12
cost centre 241, 242, 243
costing 241–3, 245–6, 259–60
credit 247, 264–5;
trade 247, 248–57, 258, 259, 265, 276
credit sale, acquisition by 97
no structure 17;
profit centre 9, 15;
rehire 17;
service centre 9, 15
equipment selection 2, 105–12;
decision process 105, 106–12;
technical evaluation 105–6
equipment types:
bulldozer 24–6, 27, 28, 34, 46;
compaction equipment 36–9;
compactor rollers 34–9, 46;
compactor rollers, sheep’s foot 25, 35;
compactor rollers, single/double drum 34;
compactor rollers, vibrating and dead weight 35–6;
crane 46–9;
crane, mobile 42, 49;
crane, tower 46–8;
dump truck 1, 27, 42–6;
dump truck, articulated 43–5;
dump truck, rigid 45–6;
dump truck, site 43–4;
excavator 27–34, 39, 43;
excavator, mini 32–4, 40;
excavator, tracked 1, 28–31;
excavator, wheeled 32;
forklift truck and telehandler 40–2;
rough terrain fork lift ‘masted’ truck 1, 42;
rough terrain telescopic handler 42;
skid steer loader 1, 40, 50–1;
tracked loader 27;
wheeled loader 39, 43, 49–50;
wheeled ‘tractor’ backhoe loaders 24, 39–40
equity 238
equivalent annual cost 55, 58–60, 69, 78–80
hiring 1, 2, 105;
and acquisition 7–8, 15–17;
acquisition by 96, 99–100;
economic comparisons 60, 70–1;
and profitability 81, 92
industries:
aggregates 1, 50;
agriculture 3, 9, 39, 40, 46, 51, 187, 229, 292;
airports 35;
civil engineering 1, 3, 39, 42, 46, 51, 177, 218, 221;
construction 1, 3, 9, 13, 34, 35, 39, 42, 45, 46, 50, 51, 95–6, 121, 171, 177, 179, 187, 191, 248,
265, 273, 278, 282, 290, 291;
demolition 25, 29, 51;
earth moving 9, 24, 29, 42, 43, 170;
forestry 1, 292;
mineral extraction 191, 292;
mining 1, 3, 9, 27, 28, 31, 34, 42, 43, 45, 50, 55, 171, 177, 199, 229;
quarries 9, 45, 55, 171, 177, 187, 191, 199;
rail 32, 34, 46;
road 25, 34;
road and rail 187, 191;
scrap metal 1;
shipping 46, 51;
transport 9;
waste 34
inflation 3, 242, 266;
and economic comparisons 55, 60–9;
and financial management 275, 282;
and hiring 13, 22, 120–2;
and profitability 91–6
information technology 3, 112, 149, 283–93;
applications 283–7;
basic accounting or bookkeeping 283–4;
communication and data exchange tools 287–92;
data conferencing 290–1;
electronic commerce 291–2;
electronic mail 289;
extranet 288;
file transfer protocol 289;
financial appraisals 283, 287;
global positioning system 292–3;
internet 287–92;
intranets 288;
management accounting and information 283, 284–7;
teleconferencing 290–1;
video conferencing 291;
world wide web 289
inspection:
equipment 12;
health and safety 13, 153–5, 174, 180, 181, 182, 184;
Index 338
lease:
finance 98–9;
operating 98–9
lease payments:
and acquisition 98, 99, 102, 104;
and cash flow 261–4
leasing 7–8, 20, 105;
acquisition by 97–104;
and cash flow 248, 260–1;
financial management 273, 275, 276, 278
licensing 132–6;
driver 132, 133–4;
heavy goods vehicle 133–4;
and hire rates 112, 117, 119, 122;
Index 339
import 232;
legalities 132–6;
legislation 132–3;
operator 132, 134–6;
public service vehicle 133;
vehicle excise 132, 133
Lifting Operations and Lifting Equipment Regulations (LOLER) 175, 187
liquidity 1;
and cash flow 247
loan capital 20, 113, 238, 247, 269, 272–3
financial 247;
hire companies 9–13;
and selection 108
management structure 9–13;
administration 11, 21;
asset register 13;
board of directors 11;
cost accounting 12;
financial accounting 11, 21;
functions and departments 10–13;
hire desk 13;
managing director 10–11, 13;
purchasing 12;
transport 13;
workshop control and maintenance 12
manufacturer 20, 121, 247;
and equipment types 24, 25, 27, 34, 39, 42, 43, 45, 46, 47, 49, 50, 51;
and health and safety 177, 184;
and maintenance 140, 142, 144, 148;
and selection 108, 110
market analysis 19–20
market forecast 19–20
market trends 22
merger 118
trading analysis 22
training 1, 12, 20;
and international operations 229;
and maintenance 147–8, 149;
Index 344
utilisation 1, 119;
and acquisition 8, 13, 100;
and information technology 286;
and profitability 82, 87–8;
reports 197, 243–5, 285–6;
variance 243–4
utilisation levels 15–17, 22, 105;
and hiring 113