SAES B 055 Plant Layout

Engineering Standard
SAES-B-055 25 March 2012

Plant Layout
Document Responsibility: Loss Prevention Standards Committee
Saudi Aramco DeskTop Standards

Table of Contents
1 Scope............................................................. 2
2 Conflicts and Deviations................................ 2
3 References..................................................... 2
4 Definitions...................................................... 3
5 Design Considerations................................... 5
6 Instructions for Use of
Spacing Charts and Tables.................... 6
7 Miscellaneous Onsite
Spacing Requirements........................... 7
8 Introduction to Offsite
Spacing Chart – Figure 2..................... 10
9 Miscellaneous Offsite
Spacing Requirements......................... 10
Appendix – Supplemental Information................ 14
Previous Issue: 27 February 2007 Next Planned Update: 25 March 2017

Revised paragraphs are indicated in the right margin Page 1 of 34
Primary contact: Ashoor, Esam Ahmed on 966-3-8728431
Copyright©Saudi Aramco 2012. All rights reserved.

Document Responsibility: Loss Prevention Standards Committee SAES-B-055
Issue Date: 25 March 2012
Next Planned Update: 25 March 2017 Plant Layout
1 Scope
This Standard provides minimum spacing requirements for equipment and structures in
the design and layout of new plants and expansions or modifications of existing plants.
Exception:
Where this Standard is in conflict with specialized requirements for offshore platforms,
covered in SAES-B-009; for piers, wharves, sea islands, in SAES-B-060; bulk plants/air
fueling operations in SAES-B-070, and buildings in SAES-M-100, those Standards shall
govern.
2 Conflicts and Deviations
2.1 Any conflicts between this Standard and other applicable Saudi Aramco
Engineering Standards (SAESs), Saudi Aramco Materials System Specifications
(SAMSSs), Saudi Aramco Standard Drawings (SASDs), or industry standards,
codes, and forms shall be resolved in writing by the Company or Buyer
Representative through the Manager, Loss Prevention Department of Saudi
Aramco, Dhahran.
2.2 Direct all requests to deviate from this Standard in writing to the Company or
Buyer Representative, who shall follow internal company procedure SAEP-302
and forward such requests to the Manager, Loss Prevention Department of Saudi
Aramco, Dhahran.
3 References
The selection of material and equipment, and the design, construction, maintenance, and
repair of equipment and facilities covered by the Standard shall comply with the latest
edition of the references listed below, unless otherwise noted.
 Saudi Aramco References
Saudi Aramco Engineering Procedure

SAEP-302 Instructions for Obtaining a Waiver of a Mandatory
Saudi Aramco Engineering Requirement
Saudi Aramco Engineering Standards

SAES-B-005 Spacing and Diking for Atmospheric and Low-
Pressure Tanks
SAES-B-006 Fireproofing for Plants
SAES-B-009 Fire Protection and Safety Requirement for
Offshore Production Facilities
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SAES-B-014 Safety Requirements for Plant and Operations

Support Buildings
SAES-B-054 Access, Egress, and Materials Handling for Plant
Facilities
SAES-B-058 Emergency Isolation, Shutdown, and Depressuring
SAES-B-060 Fire Protection for Piers, Wharves and Sea Islands
SAES-B-062 Onshore Wellsite Safety
SAES-B-064 Onshore and Nearshore Pipeline Safety
SAES-B-068 Electrical Area Classification
SAES-B-069 Emergency Eyewashes and Showers
SAES-B-070 Fire and Safety Requirements for Bulk Plants, Air
Fueling Terminals, and Sulfur Handling Facilities
SAES-D-109 Design of Small Metallic Storage Tanks
SAES-D-110 Design of Fiberglass-Reinforced Plastic (FRP)
Storage Tanks
SAES-F-007 System Design Criteria of Flares
SAES-L-310 Design of Plant Piping
SAES-J-502 Analyzer Shelters
SAES-P-107 Overhead Distribution Systems
SAES-S-020 Oily Water Drainage Systems
SAES-X-700 Cathodic Protection of Onshore Well Casings
4 Definitions
Accessway: An accessway is a level paved area that allows access for mobile
maintenance or fire fighting vehicles to equipment. An accessway will often have a
dead-end since it is not intended for continued travel through a unit. Accessways are
restricted to use only by emergency vehicles, for maintenance, or for the delivery of
operations or maintenance supplies.
Basic Spacing: Basic spacing is the minimum required distance to be maintained

between a certain type of equipment and other equipment, buildings, or support
facilities unless otherwise indicated in the body of the chart.
Combustible Liquid: A liquid that has a flash point greater than 54°C (130°F).
Examples are fluids such as diesel, C7+ feed stocks, bunker fuel, and sulfur.
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Flammable Liquid: A liquid that has a flash point equal to or less than 54°C (130°F).
Examples would be fluids such as stabilized crude, gasoline, Jet A-1, Jet JP-4, Jet JP-8,
C6 and lighter feed and blending stocks, and methanol. For purposes of this Standard, a
combustible liquid stored or processed at a temperature equal to or higher than 8°C
(15°F) below its flashpoint shall be considered to be a flammable liquid.
Flashing Liquid: A flammable liquid with a true vapor pressure greater than 90 kPa(abs)
(13 psia) at 54°C (130°F). Examples are fluids such as "gassy" crude oil, C5 feed
streams, and other products which due to their high vapor pressure cannot be stored in
atmospheric storage tanks, not including refrigerated liquids and not including fluids
with vapor pressures exceeding 67 kPa (ga) (10 psig).
High-Flash Stocks: High-flash Stocks are fluids having a flash point over 54°C
(130°F), stored at temperatures more than 8°C below the flash point. Also see
Combustible Liquid.
Low-flash Stocks: Low-flash stocks are fluids with a true vapor pressure less than
90 kPa(abs) (13 psia) and a flash point under 54°C (130°F). This may also characterize
any other fluids that are stored at temperatures above the fluids flash point or within
8°C of the fluid's flash point.
Main Overhead Powerlines: Powerlines that carry a power load in excess of 69 kV.
Main Office Building: An office building that contains offices for 25 or more people
who perform engineering or administrative activities not directly supporting day-to-day
operations of a plant.
Major Highway: A major highway (for the purposes of use in Section 9.4 in this
standard) is a public primary or secondary roadway as designated by the Ministry of
Transport. A primary road connects urban areas of 100,000 persons or more, connects
multiple regions, and serves international connections and is generally a limited access
highway. A secondary road may or may not have controlled-access, connects urban
areas of 50,000 persons or more, connects 2 regions, and may or may not serve
international connections.
Major Offsite Pipeways: Piping that interconnects plants or that connects plants and
storage facilities.
Off-site spacing: Spacing between units. Also spacing between a unit and certain types
of equipment that are not normally inside a process unit such as flares or LPG storage
vessels.
On-site Spacing: Spacing between equipment within the same process unit or utility
unit.
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Perimeter Fence: The fence which completely surrounds an area designated by Saudi
Aramco for a distinct function (plant area, light industrial part, camp, or other function).
Plant Area: The designated area engaged in the production, processing,

manufacturing, storage, and transportation of crude oil, natural gas, refined products
and their derivatives. A plant area may be inside an onshore perimeter fence or on the
decks of offshore structures.
Plant Piping: Pressure piping system, within an identified plant-area. Plant piping
design and spacing is covered in SAES-L-310.
Plant Utility Service: The supply of steam, water, air, nitrogen or inert gas within a
processing plant.
Plot-Limit: The plot-limit is a boundary, within the plant area, which surrounds a
single unit or function. The plot-limit may be physical such as a wall, the edge of a road
or pipe-way, chains, posts or a boundary indicated on an approved plot plan.
RTR Pipe: Glass-fiber-reinforced thermosetting resin pipe, also called RTRP or

fiberglass pipe.
Satellite Instrument House or Building: Otherwise known as a PIB (Process

Interface Building) or I/O rack room (I/O refers to input/output, or sending and
receiving of data.) This is a building that houses essential electronics equipment for
controlling and monitoring of field equipment.
Tell-Tale: A horizontal cable or post across a road right-of-way at the maximum

allowable elevation to cross safely under a powerline, pipe rack or other obstruction.
5 Design Considerations
5.1 General
Plant layouts for new construction shall provide for a maximum of safety and
exposure protection from the spread of fire, with ease of operation and
maintenance consistent with economical design.
5.2 Requirements for future expansion shall be identified by the Facilities Planning
Department and reasonable allowances made on the plot plan drawings.
5.3 Basic Objectives
The basic objectives of the Spacing Design criteria given in this Standard are as
follows:
5.3.1 To minimize involvement of adjacent facilities in a fire.
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5.3.2 To permit access for firefighting.
5.3.3 To ensure that critical emergency facilities will be accessible for

operators to perform emergency shutdown actions in the event of a fire
or explosion.
5.3.4 To segregate higher-risk facilities or equipment from less hazardous

operations and equipment.
5.3.5 To separate continuous ignition sources from equipment that may have
a higher potential to be a source of release of flammable materials.
5.3.6 To permit access by plant personnel for normal operation and

maintenance of equipment.
5.3.7 To avoid danger or nuisance to persons or facilities beyond the

adjacent property lines.
5.3.8 To minimize equipment damage from a fire or explosion to the

immediate area.
5.4 Spacing Basis
The minimum required spacing distances given in this Standard will provide
spacing similar to other plants when compared with facilities similar in nature
elsewhere in the world. They are minimums which will satisfy the above
objectives but do not account for situations such as potential vapor cloud
explosions or flare stack dispersion. There will be instances when special
considerations will provide cause to deviate from these recommended spacings.
5.5 Deviations from Spacing Standard
Any reduction in the spacing distances in this Standard requires compensation

for the increased degree of risk. This may be achieved by providing additional
safety features such as fireproofing, automatic water spray systems, emergency
shutdown facilities or additional firefighting equipment. Reductions shall meet
Section 2 of this Standard.
6 Instructions for Use of Spacing Charts and Tables
6.1 Spacing Distances
The required minimum spacing distances for buildings and equipment are
presented in the Onsite Spacing Chart (Figure 1) and the Offsite Spacing Chart
(Figure 2).
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6.2 Spacing Charts - Basic Spacings
For each facility covered in the charts, the basic spacing is given. This basic
spacing is the required distance to be maintained between a given facility and
other general processing equipment, building or support facility unless a
deviation is indicated in the body of the chart. (See paragraph 6.3 for spacing
between two facilities). This distance is required to minimize the likelihood of a
specific facility becoming involved in fires originating on other equipment, or
vice versa. This basic spacing is not normally required between items of
equipment in similar services, such as a pump and its spare, or pumps and
compressors and their individual drivers.
6.3 Spacing between Two Facilities
The spacing requirement between two facilities is obtained from Figure 1 or

Figure 2 at the inter-section of the appropriate horizontal rows and vertical
columns.
6.4 Reference to Spacing Guides in the Appendix
It is essential that the onsite and offsite charts be used in conjunction with the
spacing guides provided in the Appendix of this standard. These guides are
intended to supplement their respective charts with the following information:
6.4.1 Explanation of the basic spacing requirements for each facility --

Normally, spacing between facilities will be the larger of the two basic
spacings involved.
6.4.2 Explanation of variations from the basic spacing requirements --

These explanations are given in the guide for only one of the two
facilities involved. Therefore, reference should be made to the write-up
for both categories to obtain the reasoning for basic spacing variations.
6.4.3 General remarks on location and spacing for each facility.
6.5 Special Equipment
Gas expansion turbines and hydraulic turbines shall be treated in their spacing
similar to compressor or pumps handling flammable fluids.
7 Miscellaneous Onsite Spacing Requirements
7.1 Introduction
The onsite Spacing Chart in Figure 1 provides spacing distances for the typical
on-site equipment. However, it is impractical to include all spacing requirements
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in Figure 1. For this reason, spacings are established in this section for
additional items of equipment where fire prevention or safety spacing is
considered to be important. This includes personnel safety items, as well as
equipment involved in hydrocarbon releases or providing a source of ignition for
such releases.
7.2 Air Intake Locations
Air intakes are required for a number of items of equipment that are located in
or near plants. Included are internal combustion engines and turbines, air
compressors, inert gas generators, forced draft furnaces, buildings (including
substations) containing unclassified electrical equipment, and boilers.
These equipment items represent an internal source of ignition for any
flammable vapors that might have been pulled in with the air, and the potential
for internal explosion. For this reason, the locations of air intakes in relation to
adjacent equipment must be carefully selected.
Factors to be taken into account include prevailing wind direction, probable

horizontal and vertical dispersion patterns, and the degree of hazard that would
result from contamination of the air and possible formation of a flammable
vapor/air mixture. In instances where air conditioning equipment is utilized for
buildings in hydrocarbon processing plants, additional factors for protection of
personnel hazards or nuisance from toxic or other vapors shall meet
SAES-B-014.
7.3 Facility layout and spacing for offshore GOSPs shall meet SAES-B-009.
7.4 Analyzer and Operator Shelters
7.4.1 Analyzer and Operator shelters may be located within the plot-limits of
a plant.
7.4.2 The shelters shall be located with free access of no less than 3 m on all
sides. For details, see SAES-B-014 and SAES-J-502.
7.5 Exhaust stacks
7.5.1 Atmospheric exhausts from steam turbines, combustion gas turbines,

and internal combustion engines shall be located so that they will not
present a hazard to personnel and/or equipment on the same platform
or on adjacent working platforms. They shall be at least 3 m higher
than any platform or access within a horizontal distance of 7.5 m.
7.5.2 The exhaust stack for combustion gas turbines and internal combustion
engines shall discharge above the turbine or engine at a level outside
the classified electrical area.
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7.5.3 Where the turbine or engine is driving a compressor or pump handling

flammable fluid, the pump area shall not be enclosed and shall be
freely ventilated, and the stack shall be covered by insulation and an
outer jacketing impervious to liquids.
7.6 Emergency Eyewashes and Showers
For locations of emergency eyewashes and showers, refer to SAES-B-069.
7.7 Portable Gas Cylinders
Portable gas cylinders are used in some plant areas. Vulnerability to fire
exposure shall be considered in selecting their location within the plant. The
following shall apply:
7.7.1 High-risk cylinder installations involving multiple cylinders of

flammable or toxic fluids shall be located at the edge of the plant area,
and no less than 7.5 m from other hydrocarbon equipment.
Good access for firefighting shall be provided. Bulk storage of such
cylinders shall be located in a remote offsite area.
7.7.2 Lower-risk installations of single cylinders containing flammable

material or multiple cylinders of inert gases shall be located at least
7.5 m from high fire risk equipment such as pumps, gas compressors,
furnaces, and equipment operating over 315°C. In all instances,
cylinders must be adequately chained or supported to avoid the
possibility of falling or being knocked over.
7.8 Cathodic protection equipment spacing shall meet the requirements of

SAES-X-700.
7.9 Windsocks shall be installed at plant facilities handling flammable gases, volatile
liquids or toxic materials. These areas include, but are not limited to, GOSPs, gas
processing and compression plants, chlorination facilities, bulk plants, production
or injection wellsites in populated areas, permanent outdoor storage areas for
portable gas cylinders, and near gas flare systems. Windsocks shall be mounted
where they can be clearly seen from most ground level points within the plant
boundary. Mounting shall be on the tops of structures or on a pole. More than one
windsock may be required at a plant site. Windsocks shall also be installed at
heliports. Windsocks at heliports shall be lighted if required for night flights by
the Chief Pilot. Windsocks are not required along pipelines except in hydrocarbon
pump stations and major manifolding and scraping stations.
7.10 For plant piping spacing requirements, see SAES-L-310.
7.11 Use of vegetation for landscaping is prohibited within a plant area.
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8 Introduction to Offsite Spacing Chart – Figure 2
8.1 The Offsite Chart in Figure 2 provides spacing distances for the typical facilities
being used by Saudi Aramco. These recommended figures will satisfy the
objectives listed in Section 5.3. The provisions of Section 5.5 shall apply if
reductions are needed.
8.2 Since it is impractical to include all offsite spacing requirements in Figure 2,

additional spacings for miscellaneous facilities are included in Section 9.
The appendix should also be used in conjunction with this chart as outlined in 6.4.
9 Miscellaneous Offsite Spacing Requirements
9.1 GOSP, Bulk Plant, and Storage Facilities
All facilities within the plot-limits shall be located a minimum of 300 meters
from major roadways or railroad lines.
9.2 Marine Loading Facilities
There are no basic spacing guidelines of onshore or offshore tanker loading

facilities. The spacing will be dictated by operational and sailing requirements of
the tankers being loaded. Fire prevention and safety requirements are covered in
SAES-B-060.
9.3 Offshore Platforms
Spacing for the auxiliary platforms associated directly with a GOSP is covered
under SAES-B-009. Other offshore platforms are normally unmanned and
support no process, separating or storage facilities. Examples are water injection
platforms and platforms supporting piping manifolds only. Such platforms shall
normally be placed at least 45 m from any platform containing oil and gas
separation, processing, handling or storage facilities.
9.4 Electrical Grid Transmission Lines
Spacing between overhead electrical grid transmission lines and pipelines shall
be in accordance with SAES-B-064.
The following minimum basic spacing for electric transmission lines shall be
kept from:
a) Flares and burn pits - 150 m horizontal.
b) Major highways (as defined in Section 4) - 30 m horizontal.
c) All items - 9 m vertical.
Page 10 of 34
9.5 Roadways in Plants and Other Facilities
9.5.1 The layout and spacing of roads is of considerable importance in a

refinery or other major plants. They provide a means of access for
normal maintenance equipment and firefighting equipment. A logistics
study shall be done to prepare a roadway plan. The plan shall be
reviewed by the Proponent Operating Department and Loss Prevention.
9.5.2 All buildings, major equipment areas, and areas reserved for future
plant expansions shall be accessible to allow for installation of large
vessels or oversized heavy equipment.
9.5.3 The number of pipe racks and overhead powerlines crossing roads
shall be minimized as much as possible in the layout of a plant area.
Overhead obstruction warning signs and tell-tales shall be installed on
each approach to pipe racks and powerlines.
9.5.4 Vehicle barriers shall be provided for exposed piping near grade for
primary and secondary roads.
9.5.5 Placement and protection of fire hydrants and monitors shall be such
that firefighter access to the fire hydrant and monitor is not hindered.
9.5.6 When considering where to locate vehicle access for a plant,

consideration shall be given to where surface drainage or gas leaks
might prevent plant access for emergency responders during an incident.
9.5.7 The minimum vertical clearance (measured from the highest point of
the road grade) of overhead powerline conductors at in-plant road
crossings shall meet SAES-P-107.
9.5.8 Three types of roads are normally associated with oil processing plants,
refineries, and similar facilities.
a) Primary roads are generally for vehicular traffic outside a plant
but they may also be used inside large plants such as Ras Tanura
Refinery. Primary roads are used to allow unrestricted traffic to
travel more easily and safely between plants or through an
industrial area such as a light industrial park.
b) Secondary roads are roads which are inside the plant and
normally carry general traffic with no restrictions.
c) Accessways are usually within the plant plot-limits and restricted
to maintenance or emergency vehicles or to the delivery of
operational supplies after permission is secured from the plant
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operator. Accessways are normally posted and access physically

restricted with an appropriate barrier such as a gate to prevent
unauthorized access. The location and type of barriers needed
will be assessed and included as part of the roadway plan
approval.
9.5.9 Vertical Clearance for Roads

a) Vertical unrestricted clearance for elevated pipe racks and other
obstructions crossing over primary and secondary roads shall be
no less than 7.5 m.
b) Vertical unrestricted clearance for elevated pipe racks and other
obstructions crossing over accessways shall be no less than 5.5 m.
Exception:
Vertical clearance for overhead obstructions shall be no less than

5.5 m for roads and accessways for GOSPs and bulk plants.
9.5.10 The following requirements shall be followed in laying out roadways:

a) Primary roads shall be 8 m wide, with 2 m shoulders on each
side. Secondary roads shall be 7 m wide, with 1.5 m shoulders on
each side. For primary and secondary roads the following clear
spaces from the edge of the shoulder shall be maintained:
 No less than 5 m horizontal from the edge of the road
shoulder to the nearest edge of buildings, pipeways or
equipment, with barriers placed between road and the
building, pipeline, or equipment.
 No less than 15 m horizontal from the edge of the road
shoulder to the nearest edge of high-risk equipment such as
pumps handling flammable materials, compressors handling
flammable gases, equipment operating at over 315°C, and
furnaces.
b) Accessways shall be a minimum of 6 m wide with a minimum
spacing of 6 m horizontal from the accessway edge to the nearest
edge of equipment or the related equipment skid. Refer to A1.2.3
for further details.
c) For roadways in tank farms, refer to SAES-B-054.
d) For roadways in wellsite areas, refer to SAES-B-062.
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9.6 Residential Housing
Where residential housing facilities, under Saudi Aramco's control are within a
distance of 1.5 km of a hydrocarbon processing plant area perimeter fence the
facilities shall be located upwind or crosswind of the prevailing wind direction.
The prevailing wind direction applicable to a particular location shall be
determined after consultation with the Environmental Protection Department,
Environmental Unit. However, in no case shall such housing be located closer
than 500 m of a hydrocarbon processing plant area perimeter fence.
9.7 Restrictions on the Use of Nonmetal Tanks and Vessels
9.7.1 The use of tanks and vessels made of thermoplastic resins is prohibited.
9.7.2 Tanks and vessels made of fiberglass-reinforced plastic (FRP) or

fiberglass composite may in some services be a technically acceptable
alternative to steel and may be used with the concurrence of the Chief
Fire Prevention Engineer and Supervisor, Piping & Mechanical Unit,
Consulting Services Department, with further restrictions as follows:
a) Small tanks or vessels shall meet SAES-D-109 or SAES-D-110.
b) All FRP vessels and tanks shall be located a minimum distance of
30 m from any critical piping or equipment. Consideration shall
also be made to ensure that these tanks/vessels and any
associated loading equipment or tank trucks, will not pose a
hazard to other facilities.
c) Firefighting equipment and emergency procedures that are
consistent with the type of chemical being stored or processed
shall be provided at each installation.
d) 100% diking of each nonmetal tank or vessel shall be provided.
e) Drainage of any diked area shall be provided to meet SAES-S-020.
Revision Summary
35 March 2012 Revised the "Next Planned Update." Reaffirmed the content of the document, and reissued
with minor revision.
Page 13 of 34
Appendix – Supplemental Information
A1.1 Scope
The Appendix provides supplemental information to be used in conjunction with the

spacings given in Figure 1 and Figure 2 of this Standard.
A1.2 General Onsite Layout
A1.2.1 Facilities Location Guidelines: Within plant plot limits, the locations of major
facilities such as control houses, furnaces, compressors, electrical substations,
etc., shall be determined in accordance with the spacing standards, with
consideration given to proximity of adjoining facilities, location of roadways,
prevailing wind direction, site topography, and similar factors.
A1.2.2 Accessways in Layout-General: The overall layout of the process area shall
be designed with accessways for firefighting, maintenance, and turnaround
isolation. The typical rectangular block pattern is recommended for large
plants and major complexes. This block layout will provide for at least two
approaches to all major process units. All-weather roads shall be provided in
all instances.
A1.2.3 Accessways in Layout - Specific widths: The following guidelines shall be

observed in overall plant layouts:
A1.2.3.1 Accessways shall be a minimum edge distance of 6 m to

equipment. These preferably should be arranged in rectangular
patterns such that the shorter dimension of each subdivision area
does not exceed 30 m. This layout arrangement will permit
effective firefighting access for attack from two opposite sides,
with at least one side expected to be available even under
emergency conditions. Consideration shall also be given to limiting
the longer dimension of each continuous equipment area to 60 m
by the inclusion of additional firefighting accessways.
A1.2.3.2 Provide 5.5 m clear space under overhead pipeways, with or

without air-cooled heat exchangers above them, if this area is to be
considered as firefighting access from one side of an area
subdivision.
A1.2.4 Equipment Stacking: Some equipment stacking may be necessary to effectively

utilize the plot space, but extensive stacking creates the potential of heavy fire
involvement. Thus, the following restrictions on this practice shall apply:
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A1.2.4.1 Avoid stacking more than three levels of equipment in height.

Generally, equipment stacked should be in the same service in the
normal process flow path (i.e., column overhead condensers and
accumulators).
A1.2.4.2 Other equipment shall not be installed directly over any of the
following:
a) Pumps or compressors handling flammable materials.
b) Air-cooled heat exchangers.
c) Heat exchangers or drums containing flammable materials at
temperatures above 315°C, or above the known auto ignition
temperatures, if lower.
A1.3 Onsite Spacing - Guide to Figure 1

Commentary Note:
The notation "From A-1, B-1", etc., found in the spacing discussions of various items,
refers to the spacing between the equipment with those reference letters in Figure 1 and
the particular item being discussed.
A-1 Control Buildings
General: Location shall be separated from any facilities creating an explosion

risk and shall be directly accessible by a roadway.
Spacing Distance, m. Remarks
Basic 30 Spacing is required to avoid fire involvement
Blast Resistant 35 Blast resistant construction may be required.
Refer to SAES-B-014.
From E-1 T-1 30 Pipeways closer than 30 m from central control houses
shall be avoided. This spacing may be reduced on one
side of the control building only to 15 m minimum, if the
lines are all welded and flanges and valves are
minimized.
B-1 Satellite Instrument Buildings
General: Location shall be at unit plot-limits, accessible by roadway.

Basic 15 Spacing is provided to avoid fire involvement. It also
provides a limited degree of protection from explosion.
Any explosion significantly damaging the satellite
instrument building would also involve associated plant
equipment, thus loss of the satellite instrument building
Page 15 of 34
would not in itself cause prolonged downtime of the

associated plants. Reduced spacing may be allowed
for low risk plants handling high-flash stocks at
temperatures below their flash points. The electrical
area classifications outlined in SAES-B-068 should
also be given consideration as they relate to spacing.
To avoid need for special pressurization or classified
electrical equipment, elevate the building 0.5 m above
grade or increase spacing to 30 m from any
hydrocarbon equipment except pipeways.
From E-1, T-1 5 Satellite instrument buildings may be closer to
pipeways than to general process equipment, provided
that the lines are all welded, and flanges and valves
are minimized.
C-1 Plant Main Electrical Load Centers or Substations

Basic 15 This spacing helps protect electrical equipment from
fires or explosions in the plant equipment it is meant to
serve.
The spacing also assists in meeting the electrical area
classification requirements given in SAES-B-068, when
elevated 0.5 m above grade.
From T-1 5 Pipeways can be located closer if they do not contain
manifolds with extensive flanges or valves.
D-1 Electrical Switchracks Critical to Emergency Shutdown Systems

Basic 7.5 To avoid damage in a moderate fire, as it has relatively
little resistance to fire exposure. The area classification
requirements of SAES-B-068 shall also be met by this
equipment.
From F-1 15 Due to the possibility of more severe fires in furnaces
where split tubes can occur, additional space is
provided to minimize damage to switch equipment.
E-1 Emergency Valves for Shut Off, Snuffing Steam, Water Sprays, Isolation, etc.
General: Spacing for emergency valves or controls relates to the equipment

being protected by the emergency facilities. For example, a shutoff valve for a
pump should be located as specified in SAES-B-058, but may be located
adjacent to other equipment.
Basic 7.5 Provides access to critical valves or controls during
emergency situations.
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From F-1 15 Additional spacing provided for snuffing steam valve

for a furnace.
From U-1 25 Water spray valves provided for pressure storage
vessels require additional spacing because of the
higher risk associated with pressure storage.
F-1 Furnaces, Heaters and Boilers
General: Furnaces, heaters and boilers present a constant source of ignition to

any hydrocarbon release; therefore, their location must be carefully selected.
The required location is on the upwind or crosswind side of a unit, near the plot-
limits. Consideration shall be given to adjacent equipment which is potentially
hazardous, whether in the same or a nearby unit. The top of the furnace stack
shall be at least 3 m higher than any working platform within 60 m horizontally.
Basic 15 This spacing separates a constant source of ignition
from equipment handling flammable materials. It also
provides for reasonable access to emergency valves in
case of a furnace split tube.
From D-1 7.5 Spacing will minimize damage to equipment in case of
G-1, I-1 a furnace fire or explosion. Reduced spacing provided
since there can be no flammable material releases from
D-1, and the materials handled by G-1 and I-1 are
already above their autoignition temperatures so that
furnaces do not represent the primary source of ignition.
From F-1 As If all furnaces shut down together for test and
Required inspection, only normal maintenance spacing is
required. Furnaces, which are shut down individually,
require 7.5 m spacing if low pressure [less than
690 kPa(ga) operating pressure at coil inlet] and 15 m
spacing if pressure is above 690 kPa(ga) at the coil inlet.
From H-1, V-1 25 Greater spacing is required due to potential for large
vapor releases.
From M-1 15 As an exception, fuel gas knockout drums may be
spaced as close as 7.5 m to their respective furnaces,
but outside any furnace spill walls.
From T-1 7.5 As an exception, this spacing does not apply between
a furnace and its own individual process and utility
lines. This spacing minimizes the involvement of major
plant pipeways in furnace fires.
From W-1 5 Spacing provided to minimize damage to equipment in
case of a furnace fire or explosion. Equipment higher
than 3 m should be spaced 7.5 m from furnaces having
liquid in the tubes.
Page 17 of 34
G-1 Compressor and Pump Drivers with High Skin Temperatures
General: This spacing requirement is intended for drivers such as diesel

engines, gasoline engines and combustion gas turbines where elevated operating
temperatures, develop as a characteristic of the unit, presenting a constant source
of ignition for possible hydrocarbon releases. They do not create as positive an
ignition source as an open flame in a furnace.
Basic 10 Provides spacing from hot surfaces on drivers to
equipment handling hydrocarbons.
From F-1 7.5 Releases from such equipment will self-ignite and
I-1, O-1 driver ignition source is not important. Spacing is
P-1, Q-1 based on minimizing damage to the driver from other
fire exposure.
From G-1 3 Provides access for operation and maintenance, and
fire fighting around associated pump or compressor.
From H-1, J-1 10 As an exception, this spacing does not apply to the
particular compressor or pump being driven.
H-1 Gas Compressors
General: Equipment associated with the compressors, such as air cooled heat
exchangers, knockout drums, etc., may be located in the compressor area and
need not comply with the 7.5 m spacing to non-associated equipment, provided
they do not restrict access for firefighting and maintenance. However, in such
instances, fireproofing shall be in accordance with SAES-B-006. Access to
compressors for firefighting purposes must be maintained on at least two sides
of the installation. Compressors handling inert gases or air may be spaced closer
to each other than is shown for gas compressors. Air intakes for air compressors
must be located in a safe area as discussed in Section 7.2 of this standard.
Steam or electric motor-driven gas compressors with less than 150 kW drivers
may be treated as pumps for spacing and location purposes.
Basic 7.5 Spacing provides a degree of protection to expensive
compressor equipment from fires or explosions
involving adjacent equipment, and vice-versa.
G-1 10 As an exception, spacing does not apply to the driver
for the particular compressor being driven. Spacing is
based on the driver being a possible ignition source.
H-1 3 Provides access for operation and maintenance, and
allows increased fire fighting access between units.
Two compressors may be grouped in the same risk
area, 7.5 m spacing would be required for fire fighting
access on at least two sides in this case.
Page 18 of 34
I-1 Pumps Handling Flammable Materials at Temperatures above 315°C
General: Flammable liquid pumps shall not be placed beneath other equipment
such as towers, drums, air-cooled heat exchangers or pipeways, in order to avoid
fire involvement of such equipment. They shall be located clear of overhead
obstructions in order that they may be reached by mobile equipment for
maintenance operations.
Basic 5 Since these flammable liquids are above their
autoignition temperatures, they will ignite on release.
Added spacing is provided between pumps, with their
higher fire potential, and adjacent high valued
equipment. Additional access is also provided for
fire fighting purposes.
From F-1 7.5 Furnaces do not represent a primary ignition source.
Spacing based on minimizing damage if a release
occurs, with a subsequent fire on either piece of
equipment.
From I-1 1.5 Spacing allowable for pumps in the same service only.
If in different services, even if both are operating at
temperatures above 315°C, the basic spacing
requirement of 5 m must be met.
J-1 Pumps Handling Flammable Materials at Temperatures below 315°C
General: Flammable liquid pumps present a higher fire potential so they should
be located away from ignition sources.
Basic 3 Spacing minimizes damage in case of fire, by providing
clear access for fire fighting. Spacing less than I-1
since pumps operating below autoignition temperature
of hydrocarbon do not represent as great of a fire risk
as those operating above autoignition temperature.
K-1 Cooling Towers
General: Spacing requirements are based on dispersion of hydrocarbon vapors

carried to cooling tower with return water, due to exchanger leakage. Cooling
towers should be located downwind or crosswind of buildings and equipment
whenever possible. In addition, consideration is given to corrosion from water in
the exhaust plume. Location of towers in relation to other equipment shall
consider these effects.
Basic 15 Spacing provides reasonable distance for hydrocarbon
vapors released with plume to be dispersed before
Page 19 of 34
reaching a source of ignition. Equipment that does not

represent a source of ignition and is lower than the
cooling tower should be spaced 15 m away.
From High 30 Equipment higher than the cooling tower Equipment
shall be spaced a minimum of 30 m away because of
impingement of the plume.
L-1 Air Cooled Heat Exchangers
General: Due to the extensive heat transfer surface and type of metals used for
those surfaces, air-cooled heat exchanger bundles are highly vulnerable to damage
within a few minutes under fire exposure. Air cooled heat exchangers shall be
located on the opposite side of the plant, away from furnaces, to avoid ignition in
case of air cooled heat exchanger leakage. They shall not be located over
equipment listed in A1.2.4.2, which may have a relatively higher fire potential.
Location over major pipeways with equipment on both sides shall be carefully
considered. This is based on limited firefighting access, and the maintenance
difficulties that are introduced. When layout dictates that they be located above
major pipeways, then the following requirements shall be applied:
a) Adequate headroom of at least 3 m shall be provided between the lowest
part of the air-cooled heat exchanger and the top of the pipe rack.
b) Flanges and valves shall be minimized in all hydrocarbon lines below the
air-cooled heat exchanger.
c) The horizontal spacing requirements as given in Figure 1 from both the
air-cooled heat exchanger and the pipeway shall be met.
d) Access shall be provided for mobile equipment used in the removal or
replacement of the air-cooled heat exchanger units.
e) Supports for the air-cooled heat exchanger and pipeway shall be
fireproofed if so required by SAES-B-006.
Basic 3 Spacing to minimize fire exposure to air-cooled heat
exchangers, since they are more vulnerable to fire
damage than shell and tube exchangers.
From M-1, R-1, - This equipment can be located beneath air cooled
S-1, T-1 heat exchangers, subject to general requirements.
M-1 Drums
Basic 1.5 Spacing is primarily to provide access for operating
and maintenance; it also allows some access for
fire fighting.
Page 20 of 34
N-1 Towers and Columns

Basic 3 This spacing provides access for operation and
maintenance, with some additional spacing for
fire fighting access.
O-1 Reactors above 315°C (Internally Insulated)
General: Releases from connections on reactors operating at temperatures above

315°C are expected to auto ignite. Reactors operating at temperatures below
315°C shall be treated as columns for spacing purposes.
Basic 7.5 Spacing provides protection to exposed shells, and
also provides access for fire fighting. Internally lined
reactors are more susceptible to fire damage than
unlined vessels.
From L-1 5 An air-cooled heat exchanger fire would not be expected
to expose reactor; thus reduced spacing allowed, based
upon fire exposure from reactor to fin fan.
From O-1 1.5 Access is provided for operation and maintenance.
Reactors in same service may be grouped together for
operating efficiency.
From S-1 5 Spacing minimizes damage to structures during a
reactor fire, and also provides access for fire fighting,
around the base of the reactor. Spacing to equipment
within structure must meet individual spacing
requirements.
P-1 Reactors above 315°C (Externally Insulated)
General: Releases from connections on reactors at temperatures above 315°C

are expected to auto ignite. Reactors below 315°C may be treated as columns for
spacing purposes.
Basic 5 Damage to other equipment is minimized by spacing.
Spacing takes into account the protection afforded
from fires on other equipment by the external
insulation. Access for fire fighting is also provided.
From P-1 1.5 Spacing provides access for operation and
maintenance. Reactors in same service may be
grouped in the same area.
Q-1 Exchangers Operating Above 315°C
General: The spacing requirements for this item apply to any exchanger
Page 21 of 34
containing flammable materials above 315°C inlet temperature, where auto

ignition on release is expected.
Basic 5 Spacing minimizes damage to adjacent equipment and
also provides some access for fire fighting.
The probability of fire is greater than with exchangers
operating below 315°C.
From F-1 7.5 Spacing provides for more distance between the
exchanger and a furnace, since releases from cold
side of exchanger may not autoignite or ignite from hot
side flanges of the exchanger.
From Q-1 1 Exchangers which are directly connected by a process
stream and operating above 315°C may be spaced as
shown. The basic 5 m spacing should be applied to
other exchangers.
R-1 Exchangers Operating Below 315°C
General: Spacing is less since any flammable materials released will generally
be below their autoignition temperatures.
Basic 1.5 Primarily provides access for operation and
maintenance.
From R-1 1 For exchangers in similar service.
S-1 Main Equipment Structures
General: Spacing to the structure from other equipment is primarily to provide

access for maintenance operation and firefighting, and to minimize fire exposure
to the structure.
T-1 Onsite Pipeways

Basic 5 Spacing is primarily provided between pipeways and
equipment to allow for operation and maintenance, and
to reduce involvement from fires in adjacent
equipment. Equipment handling flammables shall not
be located under or above pipeways. There is no
spacing requirement relative to motor or steam turbine
drivers from pipeways.
From J-1 1.5 Same comment on drivers as for I-1. Reduced spacing
is permitted to minimize need for extra pipe supports
for handling the pump piping on and off the pipeway.
Page 22 of 34
U-1 Onsite Pressure Storage Vessels
General: Offsite locations for this type of vessel shall be used if not otherwise
dictated by process reasons. The inventory of onsite pressure storage shall be
held to a minimum. The location of such vessels should be at the unit boundary,
at a minimum of 15 m from furnaces and other sources of ignition.
This category covers refrigeration or other accumulator vessels of over
40 m³ normal capacity, containing pentane or lighter flammable liquids.
Basic 25 Spacing is to minimize exposure to other plant
equipment from a potential source of prolonged,
severe fire. It also minimizes ignition potential in case
of light hydrocarbon release from this equipment.
From U-1 1.5 x Dia. Provides spacing between vessels for fire fighting
operation, and maintenance access.
V-1 Blowdown and Water Disengaging Drums
These spacings are based on blowdown or water disengaging drums that are
vented to a flare system.
Basic 7.5 This equipment should be located in a separate unit
area in order to avoid its involvement in plant fires.
W-1 Equipment Handling Non-Flammables

Basic - No basic spacing is required for this equipment.
However, adequate spacing must be provided for
operation and maintenance.
From F-1 5 Spacing established to minimize damage to equipment
I-1, O-1, in case of fire in equipment where released materials
P-1, Q-1 will normally be ignited.
A1.4 Offsite Spacing-Guide to Figure 2

Commentary Note:
The notation "From A-2, B-2", etc., found in the spacing discussions of various items,
refers to the spacing between the equipment with those reference letters in Figure 2 and
the particular item being discussed.
A-2 Process Areas

Basic 45 Spacing to limit damage to other equipment in case of
fire or explosion in process area, and vice-versa.
Page 23 of 34
From A-2 15 to 25 Spacing between process areas allows them to be

shutdown independently for test and inspection with
general area hot work permits. This is based on LPG,
NGL, and high-risk type refinery units. For low-pressure
crude handling, such as in stabilizer plants and crude
distillation plants, this spacing can be reduced to 15
meters. Where a number of process units are integrated
into one process area and shutdown together, the
internal spacing should be based on operation and
maintenance requirements, access for fire fighting, and
spacing between fire-risk areas.
B-2 Major Shipping Pump Areas
General: This involves those pumps whose loss would significantly reduce the
capability of delivering crude or products to major pipelines or marine tanker
terminals.
Basic 45 Spacing allows access for fire fighting and will
minimize damage to pumps in case of fire or explosion
in other equipment.
C-2 Blending and Booster Pumps

Basic 25 Spacing provides protection to pumps from fire or
explosion in other equipment, as well as exposure from
pump fires.
From G-2, - Spacing set by risk of pumps to storage tanks. As a
H-2, I-2, J-2 minimum, the pumps must be outside the tank dikes.
D-2 Major Offsite Pipeways
General: Piping which interconnects plants, or plants and storage vessels, must
be routed such that it will not remain in service through plant areas that are shut
down for turnaround. Pipeways must be outside the dikes protecting any product
or crude oil storage vessels.
Cross Country Pipelines: Cross-country transportation pipelines outside plant

areas shall be spaced according to SAES-B-064.
Basic 7.5 Spacing provides for minimizing damage to pipeways
in the event of a plant fire or explosion in major plant
equipment.
From M-2 - Personnel should be protected from electric shocks per
SAES-B-064.
Page 24 of 34
From N-2 15 Added spacing provided to minimize exposures to

normally occupied buildings.
From S-2, 15 Spacing is minimum for buried line. A minimum
T-2 spacing of 60 m is required for aboveground piping.
From U-2 100 Major offsite pipeways offer little risk to wells.
This spacing is based on exposure from a well blowout
fire.
E-2 Storage Facilities for Chemicals
General: This category covers storage for chemicals.

Basic 30 This spacing provides separation from major
equipment handling hydrocarbons which could be
involved in sustained fires. This will prevent the
overheating of chemicals.
F-2 Loading Racks for LPG
General: Liquefied Petroleum Gas (LPG) loading racks for road tank trucks
shall be consolidated at one location at the periphery of the main plant facilities.
This location shall be near an access gate (other than main gate), so that traffic
through the plant is minimized and high-risk areas are avoided. Refer to
SAES-B-070 for further details.
Tank truck loading racks must be provided with adequate space and roadways
for safe truck driving and parking, as well as safe access to and from loading
racks and weight-scales where included.
Basic 60 This spacing allows for dispersion of vapors that may
be released at the rack when making or breaking
connections, or in case of a loading arm failure.
Damage to other equipment in case of a fire at the rack
is also minimized, and vice-versa.
G-2 Pressure Storage Vessels
General: This category includes storage vessels (spheres and spheroids, bullets,
dome roof tanks, horizontal storage tanks, etc.) that store fluids with a true vapor
pressure higher than 90 kPa (abs). Releases from this equipment can result in
large vapor clouds. Also, fires associated with such storage are difficult to
handle and constitute a high risk of vessel failure with sudden release of the
entire vessel contents. These vessels shall be located down slope and downwind
from plant areas or other critical facilities or residential areas. There shall be no
other equipment inside the diked areas of these vessels, excepting associated
Page 25 of 34
piping. The vessel shell shall be at least 15 m inside the dike wall, with the
associated equipment, i.e. pumps, at least 7.5 m from outside the dike.
Basic 60 This spacing provides separation from major plant
facilities such as processing areas and buildings.
Protection is also provided for the pressure storage
vessels in case of fire or explosion at other facilities.
From H-2, I-2 60 This distance may be reduced I-2 depending upon the
size of the storage vessel. Refer to SAES-B-005.
From J-2 30 Reduced spacing allowed due to nature of stocks in
atmospheric storage tanks. Refer to SAES-B-005.
H-2 Atmospheric and Low Pressure Storage of Low-Flash Stocks
General: Low-flash stocks are fluids with true vapor pressure less than
90 kPa(abs) and a flash point under 54°C and any other fluid that may be stored
at temperatures above or within 8°C of its flash point. These normally will be
floating roof tanks. Tanks shall be placed down slope from plants or other
critical facilities or residential areas.
The spacing between the tank shell and the dike shall meet SAES-B-005.
Except for associated piping, there shall not be any equipment within the diked
area of these tanks.
Basic 60 Spacing is based on large tanks and is reasonable to
permit containment of a tank fire and keep it from
involving other facilities. It will also protect the tanks in
case of fires and explosion at other facilities. This is a
maximum spacing, it may be reduced. Refer to
SAES-B-005.
I-2 Refrigerated Storage
General: Covers low-pressure dome roof tanks of up to 17.5 kPa(ga) design

pressure which are insulated to handle refrigerated liquefied gases of pentane
and lighter flammables. Any spillage will pick up heat from the ground and
atmosphere and create large flammable vapor clouds. Fires in such facilities are
difficult to handle. This storage shall be located down slope and downwind from
process areas or other critical facilities or residential areas. The spacing between
the tank shell and the dike shall meet SAES-B-005. Equipment other than
associated piping shall not be located within diked areas of storage vessels.
Basic 60 Spacing is based on large (more than 60 m diameter)
refrigerated tanks, and is provided to permit
Page 26 of 34
containment of a tank fire to prevent involving other

facilities. Also, it minimizes chances of ignition in case
of small spills. Protection is also afforded to this
tankage in case of fire at other facilities. Spacing may
be reduced if the vessels are less than 60 m in
diameter. Refer to SAES-B-005.
J-2 Atmospheric Storage of High-Flash Stocks
General: High-flash Stocks are fluids having a flash point over 54°C, stored at
temperatures more than 8°C below the flash point. Tanks shall be located
down-slope and down-wind from process areas or other critical facilities or
populated areas. Area within dike of storage vessel must be free of all
equipment other than associated piping. The spacing between the tank shell
and the dike shall meet SAES-B-005.
Basic 30 High-flash stocks as defined represent a reduced fire
hazard, therefore, a reduced spacing is called for as
compared to the low-flash stocks. This spacing
primarily provides for avoiding damage to this tankage
from fire or explosion in adjacent facilities. Spacing
may vary with size of tank. Refer to SAES-B-005.
K-2 Boiler Houses, Power Generating Facilities
General: These facilities are critical to the continued operation of the plant or
refinery. They represent constant sources of ignition for any hydrocarbon
releases from plant process areas. They shall, therefore, be placed away from
process areas as far as possible, consistent with operating demands.
Basic 45 Spacing provides protection for these critical facilities
from possible fire or explosion in equipment handling
hydrocarbons. Steam generators which supply less than
25% of the total steam demand for a refinery or other
multiplant facility, or which supply steam only to a
particular plant within that facility, may be located nearer
operating equipment with spacing as for furnaces.
From N-2 30 Reduced spacing allowed since boiler and generating
stations constitute only a minor risk to these type
facilities. Conversely, N-2 facilities do not represent a
hazard to boilers or generating facilities.
From P-2 45 Spacing may be reduced to 30 m if the adjoining
property has only buildings or other facilities affording
little risk to the boiler plant/generating facilities.
Page 27 of 34
L-2 Major Electrical Distribution Centers
General: These facilities are considered critical to the operation of multi-plant

facilities. As a minimum, they shall be placed in a non-classified electrical area,
as defined in SAES-B-068.
Basic 45 Spacing to protect this critical equipment from potential
fire or explosion in equipment processing or handling
hydrocarbons. Loss of electrical centers would result in
shutdown of major plants of the facility.
M-2 Main Overhead Power Lines
General: These are normally high voltage power lines and they shall be routed
away from process areas and tank farms. These power lines are critical to
operations and should be protected from fires or explosions in other facilities, as
these could cause a failure of the main electrical supply.
Basic 60 Minimum spacing to provide protection from fires or
explosions in operating equipment or tankage.
From D-2 - Personnel should be protected from electric shocks per
SAES-B-064.
N-2 Buildings (Main Office, Workshops, Laboratories, Firehouses, etc.)
General: These facilities represent essentially no exposure to other facilities.

Spacing is the minimum to protect personnel in these buildings from fires or
explosions in equipment handling or storing hydrocarbons. Spacing may be
greater, depending on the building risk assessment. Refer to the requirements of
SAES-B-014 for details.
Basic 45 Minimum spacing to provide protection to buildings and
personnel from possible fire or explosion in major
equipment. However, spacing may be greater,
depending on the building risk assessment.
See SAES-B-014.
From A-2, 60 Additional spacing is provided from these facilities,
B-2, F-2, mainly for personnel protection. However, spacing may
G-2, H-2, I-2 be greater, depending on the building risk assessment.
See SAES-B-014.
O-2 Main Fire Pumps
General: These pumps may well represent the difference between minor
damage by fire or explosion and the loss of an entire process unit or plant or
Page 28 of 34
tankage area.
Basic 45 This spacing is to prevent the main fire pumps from
becoming involved in a fire or explosion occurring in
major plant hydrocarbon handling equipment.
Special purpose fire pumps, such as those for
special risk protection systems, may be spaced
closer to facilities not being protected by this system.
From Q-2 15 Reduced spacing permitted since exposure to fire
pumps can be controlled.
P-2 Property Lines
General: Spacing from property lines is primarily provided to minimize the

exposure of others to damage from a fire or explosion within the plant itself.
Its application must be considered on the basis of the associated exposures.
Basic 60 Spacing provides protection between plant facilities
and the nearest point which may be built upon or
traveled by others. It also provides protection to plant
equipment, regardless of the occupancy that may
develop in the future on adjacent property.
From J-2 45 Reduced spacing is permitted based upon the small
fire risk involved.
From L-2 - Minimum operational and maintenance access spacing
N-2, O-2 is acceptable if the facilities on adjoining property are
of the low risk type. Greater spacing should be used if
process plants, storage tanks or other similar risks are
located adjacent to the property line. In these cases,
spacing similar to internal plant requirement shall be
used.
Q-2 Fire Training Ground

Basic 45 Spacing provides separation of the source of ignition of
the training ground from equipment handling
hydrocarbons. It also allows for dispersal of the smoke
produced, thus minimizing the effect on personnel in
the plant areas.
From D-2 15 Increased spacing for pipebands is provided in view of
regular spill fires on training grounds.
R-2 Oil-Water Separators and Skimming Ponds
General: This relates to spacing to facilities unassociated with the oil-water

separator or skim pond. Spacing within the facility to pumps, small slop tanks or
Page 29 of 34
treating facilities would be developed specifically.

Basic 45 Spacing provides separation from operating areas and
other sources of ignition, to prevent hydrocarbon
vapors discharged at the separator from igniting.
It also minimizes exposure from fires at the separators.
Spacing may be reduced to low risk facilities that do
not represent a source of ignition, or where exposure
risk is minimal.
S-2 Elevated Flare
General: The design basis for spacing has to take into account the amount of
heat liberated at the flare and the amount of heat that can be tolerated by
personnel and equipment for various situations. The spacings given in Figure 2
are basic minimums; the actual spacings used shall be those resulting from
design calculation on the particular flare under consideration. Refer to
SAES-F-007 for details.
A flare is considered to be elevated when its height is more than 15 m.

Basic 60 Spacing is nominally based on the radius of fallout of
entrained liquid or solid particles (from flare to ignitable
materials). Radiant heat factor to personnel and
equipment must also be considered in design
calculations.
From D-2 15 Reduced spacing for buried lines. Distance shall be at
least 60 m from aboveground lines, unless radiant heat
calculations indicate that additional spacing is
necessary.
Additional Offshore GOSP Flare Requirements: Flares shall be located in the

southwest quadrant, 90 degrees from a downwind direction of the GOSP.
Where there is a submarine line from the platform to the flare structure, a
minimum distance of 550 m is required to reduce the effect of released
hydrocarbon liquid.
T-2 Burn Pits and Ground Flares
General: These spacings are bare minimums. They are primarily intended to
reduce the effects of smoke on personnel and equipment in nearby facilities and
on residential or public areas. The radiant heat effects on personnel and equipment
must be included in spacing calculations, as required by SAES-F-007.
Page 30 of 34

Basic 150 Basically provides for dispersal of smoke from flares or
burn pits. Radiant heat effects must be considered
also, as well as prevailing wind conditions.
From D-2 15 Minimum spacing from buried lines. Spacing for
aboveground lines shall be at least 150 meters from
ground flares and 60 meters from burn pits unless
radiant heat calculations indicate otherwise.
Onshore GOSP Flare Location Requirements
The basic spacings given in Figure 2 are generally bare minimums.

Actual spacings shall be calculated based on radiant heat effects on personnel
and adjacent equipment. The reliability of the flare light off system and the
possible exposure of adjacent equipment and personnel due to un-ignited
releases during start-up shall also be considered.
In the absence of calculations, the following spacings shall be used as

minimums for ground flares:
a) 450 m from producing oil/gas wells.
b) 150 m from offsite pipeways, unless buried lines.
c) 450 m from plot-limits of GOSP.
d) 450 m from major public roadways. The flare should be located such that
glare from it does not interfere with the night vision of vehicle drivers on
the GOSP access road, or nearby public roads.
The following minimum spacings to burn pits shall be observed, unless

calculations indicate otherwise:
a) 150 m from GOSP plot-limits
b) 150 m from overhead electrical transmission lines
c) 90 m from the GOSP ground flare
d) 60 m from above ground oil/gas lines
e) 15 m from buried oil/gas lines
U-2 Oil/Gas Wells
General: For wells, see SAES-B-062 for details on how to calculate the
minimum required spacing.
Page 31 of 34

Basic SAES-B-062 Rupture exposure radius is calculated for each well to
determine the minimum required spacing from facilities
and population. See SAES-B-062 for details.
Flares and burnpits of plants or GOSPs should be
located downwind and crosswind of any oil/gas well.
From D-2, 100 Lack of ignition source and low relative degree of
R-2 exposure risk allows reduction in basic spacing.
V-2 Residential Areas, Main Office Building
General: Residential areas should be kept free of hazards due to oil and gas
handling installations. See paragraph 9.6.
Basic 500 Under normal weather conditions, this minimum
spacing from a hydrocarbon processing plant area
perimeter fence provides a residential area or main
office building with a significant reduction in risk from
hazards from oil and gas handling installations.
From D-2 - Standard SAES-B-064 applies.
From U-2 - Standard SAES-B-062 applies.
Page 32 of 34
Figure 1 -- Onsite Spacing Chart

KEY:
A: Provide spacing based on access for
operation and maintenance.
B: As required, see Appendix.
C: One and a half times diameter of the
largest tank.
Exchangers Operating below

Note: This chart gives basic minimum
Air Cooled Heat Exchangers

Pumps Handling Flammable
Main Equipment Structures

Compressor/Pump Drivers
Equipment Handling Non-

Onsite Pressure Storage
Furnaces, Heaters, and
Reactors above 315 C

spacings and must be used only in
Reactors above 315 C

Centers or Substations
Exchangers Operating
Emergency Valves for
Shutoff, Isolation, etc.
with High Skin Temp.
Towers and Columns

Pumps above 315 C
Blowdown and Water

(externally insulated)
Plant Electrical Load
(internally insulated)
o
Disengaging Drums
o
Satellite Instrument
Gas Compressors
o
conjunction with the Onsite Spacing
Control Buildings
Onsite Pipeways
Critical Electrical
Cooling Towers
above 315 C
Flammables
Switchracks
Guide for Figure 1. BASIC SPACING
o
FACILITY
Buildings
Materials
Vessels
Boilers
315 C
Drums
(far left-hand column) is the distance to
o
be maintained if not indicated in the
chart.
Basic Reference Reference

FACILITY A-1 B-1 C-1 D-1 E-1 F-1 G-1 H-1 I-1 J-1 K-1 L-1 M-1 N-1 O-1 P-1 Q-1 R-1 S-1 T-1 U-1 V-1 W-1
Spacing Letter Letter
30 Control Buildings A-1 A A A A 15 30 30 30 30 30 30 30 30 30 30 30 30 30 30 15 30 30 A A-1
15 Satellite Instrument Buildings B-1 A A A A 5 15 15 15 15 15 15 15 15 15 15 15 15 15 15 5 25 15 A B-1

Plant Electrical Load Centers or
15 C-1 A A A A 7.5 15 A 15 15 15 15 15 15 15 15 15 15 15 15 5 25 15 A C-1
Substations
7.5 Critical Electrical Switchracks D-1 A A A A A 15 A 7.5 7.5 7.5 15 A 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 25 25 25 D-1
Emergency Valves for Shutoff,
7.5 E-1 15 5 7.5 A A 15 7.5 7.5 7.5 7.5 A 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 A 25 7.5 A E-1
Isolation, etc.
15 Furnaces, Heaters, and Boilers F-1 30 15 15 7.5 15 B 7.5 25 7.5 15 30 15 15 15 7.5 5 7.5 15 15 7.5 25 25 5 F-1
Compressor/Pump Drivers with High
10 G-1 30 5 A A 7.5 7.5 3 10 7.5 10 15 10 10 10 7.5 7.5 7.5 10 10 5 25 10 A G-1
Skin Temp.
7.5 Gas Compressors H-1 30 15 15 7.5 7.5 25 10 3 7.5 7.5 15 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 5 25 7.5 A H-1
o
5 Pumps above 315 C I-1 30 15 15 7.5 7.5 7.5 7.5 7.5 1.5 5 15 5 5 5 7.5 5 5 5 5 5 25 7.5 5 I-1
3 Pumps Handling Flammable Materials J-1 30 15 15 7.5 7.5 15 10 7.5 5 1 15 3 3 3 7.5 5 5 3 3 1.5 25 7.5 A J-1
15 Cooling Towers K-1 30 15 15 15 A 30 15 15 15 15 A 15 15 15 15 15 15 15 15 5 25 15 A K-1
3 Air Cooled Heat Exchangers L-1 30 15 15 A 7.5 15 10 7.5 5 3 15 A B 3 5 5 5 B B B 25 7.5 A L-1
1.5 Drums M-1 30 15 15 7.5 7.5 15 10 7.5 5 3 15 B 1.5 1.5 7.5 5 5 1.5 B 1.5 25 7.5 A M-1
3 Towers and Columns N-1 30 15 15 7.5 7.5 15 10 7.5 5 3 15 3 1.5 3 7.5 5 5 1.5 B 3 25 7.5 A N-1
Reactors above 315 oC (internally

7.5 O-1 30 15 15 7.5 7.5 7.5 7.5 7.5 7.5 7.5 15 5 7.5 7.5 1.5 7.5 7.5 7.5 5 5 25 7.5 5 O-1
insulated)
o
Reactors above 315 C (externally
5 P-1 30 15 15 7.5 7.5 5 7.5 7.5 5 5 15 5 5 5 7.5 1.5 5 5 5 5 25 7.5 5 P-1
insulated)
o
5 Exchangers Operating above 315 C Q-1 30 15 15 7.5 7.5 7.5 7.5 7.5 5 5 15 5 5 5 7.5 5 1 5 5 5 25 7.5 5 Q-1
1.5 Exchangers Operating below 315 oC R-1 30 15 15 7.5 7.5 15 10 7.5 5 3 15 B 1.5 1.5 7.5 5 5 1 B 1.5 25 7.5 A R-1
B Main Equipment Structures S-1 30 15 15 7.5 7.5 15 10 7.5 5 3 15 B B B 5 5 5 B A 5 25 7.5 A S-1
5 Onsite Pipeways T-1 15 5 5 7.5 A 7.5 5 5 5 1.5 5 B 1.5 3 5 5 5 1.5 5 A 5 5 A T-1
25 Onsite Pressure Storage Vessels U-1 30 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 25 5 C 25 A U-1

Blowdown and Water Disengaging
7.5 V-1 30 15 15 7.5 7.5 25 10 7.5 7.5 7.5 15 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 5 25 A A V-1
Drums
A Equipment Handling Non-Flammables W-1 A A A A A 5 A A 5 A A A A A 5 5 5 A A A A A A W-1
Reference Reference
A-1 B-1 C-1 D-1 E-1 F-1 G-1 H-1 I-1 J-1 K-1 L-1 M-1 N-1 O-1 P-1 Q-1 R-1 S-1 T-1 U-1 V-1 W-1
Letter Letter
Page 33 of 34
Figure 2 -- Offsite Spacing Chart

KEY:
V: As required by SAES-B-062.
W: As required by SAES-B-064.
X: Provide separation based on access
for operation and maintenance
Y: As required, see Appendix.
Z: As required by SAES-B-005.
Atmospheric Storage of High-

Atmospheric Storage of Low-
Note: This chart gives basic minimum
Burn Pits and Ground Flares

Main Overhead Power Lines
Major Shipping Pump Areas
Major Electrical Distribution

Pressure Storage Vessels
Oil-Water Separators and
Residential Areas, Main

Buildings, Shops, Labs,
Loading Racks for LPG
spacings and must be used only in
Major Offsite Pipeways
Elevated Flare Stacks

Fire Training Grounds
Boiler Houses, Power
Blending and Booster
Refrigerated Storage
Generating Facilities
Chemical Storage
conjunction with the Offsite Spacing
Main Fire Pumps
Skimming Ponds
Office Buildings
Oil / Gas Wells
Process Areas
Property Lines
Flash Stocks
Flash Stocks
Guide for Figure 2. BASIC SPACING
Firehouses
FACILITY
Centers
Pumps
(far left-hand column) is the distance to
be maintained if not indicated in the
chart.
Basic Reference Reference

FACILITY A-2 B-2 C-2 D-2 E-2 F-2 G-2 H-2 I-2 J-2 K-2 L-2 M-2 N-2 O-2 P-2 Q-2 R-2 S-2 T-2 U-2 V-2
Spacing Letter Letter
45 Process Areas A-2 25 45 25 7.5 45 60 60 60 60 30 45 45 60 60 45 60 45 45 60 150 V 500 A-2
45 Major Shipping Pump Areas B-2 45 X X 7.5 45 60 60 60 60 30 45 45 60 60 45 60 45 45 60 150 V 500 B-2
25 Blending and Booster Pumps C-2 25 X X 7.5 25 25 Y Y Y Y 45 45 60 45 45 60 45 25 60 150 V 500 C-2
7.5 Major Offsite Pipeways D-2 7.5 7.5 7.5 Y 7.5 7.5 7.5 7.5 7.5 7.5 7.5 7.5 W 15 7.5 7.5 15 7.5 15 15 100 500 D-2
30 Chemical Storage E-2 45 45 25 7.5 Y 60 60 60 60 30 45 45 60 45 30 60 45 45 60 150 V 500 E-2
60 Loading Racks for LPG F-2 60 60 25 7.5 60 Y 60 60 60 30 60 60 60 60 60 60 60 45 60 150 V 500 F-2
60 Pressure Storage Vessels G-2 60 60 Y 7.5 60 60 Z 60 60 30 60 60 60 60 60 60 60 60 60 150 V 500 G-2

Atmospheric Storage of Low-Flash
60 H-2 60 60 Y 7.5 60 60 60 Z Z Z 60 60 60 60 60 60 60 60 60 150 V 500 H-2
Stocks
60 Refrigerated Storage I-2 60 60 Y 7.5 60 60 60 Z Z Z 60 60 60 60 60 60 60 60 60 150 V 500 I-2
Atmospheric Storage of High-Flash
30 J-2 30 30 Y 7.5 30 30 30 Z Z Z 30 30 60 30 30 45 30 30 30 150 V 500 J-2
Stocks
Boiler Houses, Power Generating
45 K-2 45 45 45 7.5 45 60 60 60 60 30 X X 60 30 X 45 45 45 60 150 V X K-2
Facilities
45 Major Electrical Distribution Centers L-2 45 45 45 7.5 45 60 60 60 60 30 X X 60 X X X 45 45 60 150 V X L-2
60 Main Overhead Power Lines M-2 60 60 60 W 60 60 60 60 60 60 60 60 Y 60 60 Y 60 60 60 150 V 60 M-2
45 Buildings, Shops, Labs, Firehouses N-2 60 60 45 15 45 60 60 60 60 30 30 X 60 X X X 45 60 60 150 V X N-2
45 Main Fire Pumps O-2 45 45 45 7.5 30 60 60 60 60 30 X X 60 X X X 1.5 45 60 150 V X O-2
60 Property Lines P-2 60 60 60 7.5 60 60 60 60 60 45 45 X Y X X Y 60 60 60 150 V Y P-2
45 Fire Training Grounds Q-2 45 45 45 15 45 60 60 60 60 30 45 45 60 45 15 60 Y 45 60 150 V X Q-2

Oil-Water Separators and Skimming
45 R-2 45 45 25 7.5 45 45 60 60 60 30 45 45 60 60 45 60 45 X 60 150 100 X R-2
Ponds
60 Elevated Flare Stacks S-2 60 60 60 15 60 60 60 60 60 30 60 60 60 60 60 60 60 60 X 150 V Y S-2
150 Burn Pits and Ground Flares T-2 150 150 150 15 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 X V Y T-2
V Oil / Gas Wells U-2 V V V V V V V V V V V V V V V V V 100 V V X V U-2

Residential Areas, Main Office
500 V-2 500 500 500 500 500 500 500 500 500 500 X X 60 X X Y X X Y Y V X V-2
Buildings
Reference Reference
A-2 B-2 C-2 D-2 E-2 F-2 G-2 H-2 I-2 J-2 K-2 L-2 M-2 N-2 O-2 P-2 Q-2 R-2 S-2 T-2 U-2 V-2
Letter Letter
Page 34 of 34

SAES B 055 Plant Layout

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Engineering Standard

SAES-B-055 25 March 2012

Saudi Aramco DeskTop Standards

Appendix – Supplemental Information................ 14

Previous Issue: 27 February 2007 Next Planned Update: 25 March 2017

Copyright©Saudi Aramco 2012. All rights reserved.

2 Conflicts and Deviations

 Saudi Aramco References

Saudi Aramco Engineering Procedure

Saudi Aramco Engineering Standards

SAES-B-014 Safety Requirements for Plant and Operations

Basic Spacing: Basic spacing is the minimum required distance to be maintained

Plant Area: The designated area engaged in the production, processing,

RTR Pipe: Glass-fiber-reinforced thermosetting resin pipe, also called RTRP or

Satellite Instrument House or Building: Otherwise known as a PIB (Process

Tell-Tale: A horizontal cable or post across a road right-of-way at the maximum

5.3 Basic Objectives

5.3.1 To minimize involvement of adjacent facilities in a fire.

5.3.2 To permit access for firefighting.

5.3.3 To ensure that critical emergency facilities will be accessible for

5.3.4 To segregate higher-risk facilities or equipment from less hazardous

5.3.6 To permit access by plant personnel for normal operation and

5.3.7 To avoid danger or nuisance to persons or facilities beyond the

5.3.8 To minimize equipment damage from a fire or explosion to the

5.4 Spacing Basis

5.5 Deviations from Spacing Standard

Any reduction in the spacing distances in this Standard requires compensation

6 Instructions for Use of Spacing Charts and Tables

6.1 Spacing Distances

6.2 Spacing Charts - Basic Spacings

6.3 Spacing between Two Facilities

The spacing requirement between two facilities is obtained from Figure 1 or

6.4 Reference to Spacing Guides in the Appendix

6.4.1 Explanation of the basic spacing requirements for each facility --

6.4.2 Explanation of variations from the basic spacing requirements --

6.4.3 General remarks on location and spacing for each facility.

6.5 Special Equipment

7 Miscellaneous Onsite Spacing Requirements

7.2 Air Intake Locations

Factors to be taken into account include prevailing wind direction, probable

7.4 Analyzer and Operator Shelters

7.5 Exhaust stacks

7.5.1 Atmospheric exhausts from steam turbines, combustion gas turbines,

7.5.3 Where the turbine or engine is driving a compressor or pump handling

7.6 Emergency Eyewashes and Showers

For locations of emergency eyewashes and showers, refer to SAES-B-069.

7.7 Portable Gas Cylinders

7.7.1 High-risk cylinder installations involving multiple cylinders of

7.7.2 Lower-risk installations of single cylinders containing flammable

7.8 Cathodic protection equipment spacing shall meet the requirements of

7.10 For plant piping spacing requirements, see SAES-L-310.

7.11 Use of vegetation for landscaping is prohibited within a plant area.

8 Introduction to Offsite Spacing Chart – Figure 2

8.2 Since it is impractical to include all offsite spacing requirements in Figure 2,

9 Miscellaneous Offsite Spacing Requirements

9.1 GOSP, Bulk Plant, and Storage Facilities

9.2 Marine Loading Facilities

There are no basic spacing guidelines of onshore or offshore tanker loading

9.3 Offshore Platforms

9.4 Electrical Grid Transmission Lines