Course Model Imo 1.04
Course Model Imo 1.04
Course Model Imo 1.04
SUB-COMMITTEE ON STANDARDS OF
TRAINING AND WATCHKEEPING
44th session
Agenda item 3
STW 44/3/8
25 January 2013
Original: ENGLISH
Strategic direction:
5.2
High-level action:
5.2.2
Planned output:
5.2.2.5
Action to be taken:
Paragraph 3
Related document:
STW 40/14
1
Attached in the annex is a revised draft model course on Basic Training for Liquefied
Gas Tanker Cargo Operations.
2
The preliminary draft of this revised model course was forwarded to members of the
validation panel for their comments. Due to time constraints, any comments received on the
draft course from the validation panel will be provided directly to the Sub-Committee.
Action requested of the Sub-Committee
3
The Sub-Committee is invited to consider the above information and take action, as
appropriate.
***
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ANNEX
DRAFT MODEL COURSE ON BASIC TRINING FOR LIQUEFIED GAS TANKER CARGO
OPERATIONS
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ACKNOWLEDGEMENTS
This course for Basic Training for Liquefied Gas Tanker Cargo
Operations is based on material developed by Anglo Eastern
Maritime Training Centre, Mumbai for IMO.
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Contents
Page
Introduction
Part A
Course Framework
4
9
Part B
22
Part C
31
Part D
Instructor's Manual
Case Study-1
Case Study-2
72
96
154
164
166
Part E
Evaluation
167
Annex
174
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Introduction
The purpose of the IMO model courses is to assist maritime training institutes and their
teaching staff in organizing and introducing new training courses, or in enhancing, updating or
supplementing existing training material where the quality and effectiveness of the training
courses may thereby be improved. The purpose is also to enhance the capabilities of shipboard
personnel who sail on specialized carriers such as liquefied gas tankers. It is not the intention of
the course to compartmentalize the trainee's way of thinking in terms of tanker operation. The
idea is to make him/her aware of the specialization of operations specific to a liquefied gas
tanker and, sensitize him/her towards the responsibilities that s/he will face on such a vessel.
It is not the intention of the model course programme to present instructors with a rigid
"teaching package" which they are expected to "follow blindly". Nor is it the intention to
substitute audio-visual or "programmed" material for the instructor's presence. As in all training
endeavors, the knowledge, skills and dedication of the instructors are the key components in
the transfer of knowledge and skills to those being trained through IMO model course material.
Because educational systems and the cultural backgrounds of trainees in maritime subjects
vary considerably from country to country, the model course material has been designed to
identify the basic entry requirements and trainee target group for each course in universally
applicable terms, and to specify clearly the technical content and levels of knowledge and skills
necessary to meet the technical intent of IMO conventions and related recommendations.
This basic course is for all personnel serving on board liquefied gas tankers in the support and
operational level for the cargo handling in port and care in transit. By successfully doing this
course, the aforementioned shipboard personnel will fulfill the mandatory minimum
requirements of Regulation V/1-2 paragraph 2 of STCW 1978, as amended. The coverage of
the model course is wide in scope and includes liquefied gas tanker safety, fire safety
measures and fire fighting systems, prevention and control of pollution, safe operational
practices and obligations under applicable laws and regulations. In addition, the course covers
the support and operational aspects on board including a section on risk assessment, as well
as contingency drills in line with the ISM Code and the SMS on board.
In order to keep the training programme up to date in future, it is essential that users provide
feedback. New information will provide better training in safety at sea and protection of the
marine environment. Information, comments and suggestions should be sent to the Head of the
STCW and Human Element Section at IMO, London.
The instructor should review the course plan and detailed syllabus, taking into account the
information provided under the entry standards specified in the course framework. The actual
level of knowledge and skills and the prior technical education of the trainees should be kept in
mind during the review, and any areas within the detailed syllabus which may cause difficulties
because of differences between the actual trainee entry level and that assumed by the course
designers should be identified. To compensate for such differences, the instructor is expected
to delete from the course, or to reduce the emphasis on, items dealing with knowledge or skills
already attained by the trainees. S/he should also identify any academic knowledge, skills or
technical training which they may not have acquired.
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The instructor, using his/her professional judgment, can analyze the detailed syllabus and the
academic knowledge required to allow training in the technical area to proceed. The instructor
can then design the appropriate pre-entry course or alternatively, insert the elements of
academic knowledge required to support the technical training elements concerned at
appropriate points within the course.
Adjustment of the course objective, scope and content may also be necessary if in a country's
maritime industry the trainees completing the course are to undertake duties which differ from
the course objective specified in the model course.
Within the course plan the course designers have indicated assessment of the time which
should be allotted to each area of learning. However, it must be appreciated that these
allocations are arbitrary and assume that the trainees have fully met all entry requirements of
the course. The instructor should therefore review these assessments and may need to
reallocate the time required to achieve each specific learning objective or training outcome.
Aims
This course provides training to candidates to be duly qualified under Section A V/1-2 of the
STCW code with specific duties for loading, unloading and care in transit or handling of
liquefied gas cargoes. It comprises a basic training programme appropriate to their duties,
including liquefied gas tanker safety, fire safety measures, pollution prevention, operational
practice and obligations under applicable law and regulations. The course covers the
competence requirements as given in the table under Section A-V/1-2-1 of the STCW Code
adopted by the International Convention on Standards of Training, Certification and
Watchkeeping for Seafarers, 1978 as amended in 2010.
Any of this training may be given on board or ashore. It could be either by practical instruction
on board or in a suitable shore-based installation.
During the course, there will be:
Lesson plans
After adjusting the course content, if so required, to suit the trainee intake and any revision of
the course objectives, the instructor can then draw up lesson plans based on the detailed
syllabus. The detailed syllabus contains specific references to the textbooks or teaching
material proposed to be used in the course. Where no adjustment has been found necessary in
the acquisition of knowledge and proficiency of the detailed syllabus, the lesson plans may
simply consist of the detailed syllabus with keywords or other reminders added to assist the
instructor in making his/her presentation of the material.
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Presentation
The presentation of concepts and methodologies must be repeated in various ways until testing
and evaluating the trainee's performance and achievements satisfy the instructor, that the
trainee has attained the required proficiency under each specific learning objective or training
objective. The syllabus is laid out in the form of acquiring knowledge, understanding and
proficiency format and each objective specifies that the trainee must be able to do as the
learning or training outcome. Holistically, these objectives aim to meet the knowledge,
understanding and proficiency specified in the appropriate tables of the STCW Code.
Implementation
For the course, to run smoothly and to be effective, considerable attention must be paid to the
availability and use of:
Thorough preparation on part of the instructor is the key to successful implementation of the
course. IMO has produced a booklet entitled "Guidance on the Implementation of IMO Model
Courses", which deals with this aspect in greater detail and which is appended to this model
course.
In certain cases, the requirements for some or all of the training in a subject are covered by
another IMO model course. In these cases, the specific part of the STCW Code which applies is
given and the user is referred to the other model course.
This Basic training for gas tanker training cargo operations course comprises two main parts.
The first part covers liquefied gas tanker safety, hazards involved in cargo operations, and
constructional features of liquefied gas tankers to control the hazards.
The 2nd part includes operational requirements for the candidates during loading / unloading
and use of IG system. Cargo operations include operational requirements for loading /
unloading and ballasting, including the use of the inert gas system for the operator and support
levels.
Instructors should emphasize in their teaching the hazards involved in the operations on board
liquefied gas tankers. They should explain, in as much detail as necessary to ensure these
operations are undertaken safely, the systems, equipment and constructional features that exist
to control those hazards.
The lessons delivered during the course should be tailored to the needs of the candidates with
onboard experience on liquefied gas tanker and furthermore those who have received guided
instruction on board may need less classroom instructions than those who have not.
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The standards of competence that have to be met by seafarers are defined in Part A of the
STCW Code in the standards of Training, Certification and Watchkeeping for Seafarers
Convention, as amended in 2010. This IMO model course has been revised and updated to
cover the competences in STCW 2010. It sets out the education and training to achieve those
standards.
Operational requirements for any candidate taking part in loading, unloading and care in transit
or handling of cargo on liquefied gas tankers are detailed in Regulation V/1-2, para 2 of the
STCW Code. This model course aims to provide a basic training programme referred to in
Table A-V / 1-2-1 of the STCW code, appropriate to these duties.
For ease of reference, the course is divided into separate sections.
Part A provides the framework for the course with its aims and objectives and notes on the
suggested teaching facilities and equipment. A list of useful teaching aids, IMO references and
textbooks is also included.
Part B provides an outline of lectures, demonstrations and exercises for the course, together
with a suggested sequence and timetable. From the teaching and learning point of view, it is
more important that the trainee achieves the minimum standard of competence defined in the
STCW Code than that a strict timetable for each topic is followed. Depending on their
experience and ability, some students will naturally take longer to become proficient in some
topics than others.
Part C gives the Detailed Teaching Syllabus. This is based on the theoretical and practical
knowledge specified in the STCW Code. It is presented in a logical sequence, starting with
basic knowledge and information on physical properties, hazards and control safety and
pollution prevention. Each subject area is covered by a series of required performances, in
other words what the trainee is expected to be able to do as a result of the teaching and
training. In this way the overall required performance of knowledge, understanding and
proficiency is met. IMO references, textbook references and suggested teaching aids are
included to assist the teacher in designing lessons.
Part D contains an Instructor Manual. Against each heading in the detailed teaching syllabus
the teaching guidelines have been divided into:
It is envisaged that such micro level division of each heading in the teaching syllabus will give
the instructor, with varied backgrounds around the world, ample guidelines on developing
his/her work plan, as well as the flexibility to adapt keeping in mind the level of the trainees.
Furthermore, additional notes as well as simulator exercises for instructors who may have
access to a liquid-cargo-handling simulator have also been provided.
The Convention defines the minimum standards to be maintained in Part A of the STCW Code.
Mandatory provisions concerning Training and Assessment are given in section A-1/6 of the
STCW Code. These provisions cover: qualifications of instructors, supervisors and assessors.
Assessment of competence & Training is assessed within an institution. A corresponding Part B
of the STCW Code contains non-mandatory guidance on training and assessment.
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This course explains the use of various methods of demonstrating competence and criteria for
evaluating competence as tabulated in the STCW Code and may be helpful in developing any
necessary assessments that can include a form of a written examination. As a further aid to the
instructor therefore, suggestions have been made on how to create specific objective type
question paper for this course. In case a simulator is being used for training pertaining to this
model course, then it is suggested that this form of assessment be independent of the
assessment done on the simulator.
Responsibilities of Administration
Administrations should make sure that training courses delivered by colleges and academies
are such as to ensure officers completing training do meet the standards of competence
required by STCW Regulation V/1-2 par 2.
Validation
The Sub-Committee on Standards of Training and Watchkeeping has validated the information
contained in this document for use by technical advisors, consultants and experts for the
training and certification of seafarers so that the minimum standards implemented may be as
uniform as possible, "Validation", in the context of this document, means that the
Sub-Committee has found no grounds to object its content. The Sub-Committee has not
granted its approval to the document, as it considers that this work must not be regarded as an
official interpretation of the Convention.
In reaching a decision in this regard, the Sub-Committee was guided by the advice of a
validation group comprised of representatives designated by IMO.
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Scope
This course provides training for officers and ratings. It comprises a basic training programme
appropriate to their duties for liquefied gas tanker safety, fire safety measures and cargo
systems, pollution prevention, safe operational practices and obligations under applicable laws
and regulations. The course takes full account of Section A-V/1-2 of the STCW Code adopted
by the International Convention on Standards of Training, Certification and Watch keeping for
Seafarers 1978, as amended.
This training may be given on board or ashore. It can be either by practical training on board or
wherever possible on simulators in training institutions or in a suitable shore-based installation.
Objective
Provided they hold an appropriate certificate and are otherwise qualified in accordance with
section A VI / 1 of STCW convention 78 as amended, those successfully completing the
Basic training for liquefied gas tanker cargo operations course should therefore be able to carry
out specific duties during loading, unloading and care in transit or handling of cargo on liquefied
gas tankers. They will make a safer and more effective contribution to the operation on a
liquefied gas tanker, which will improve the ship safety and provide greater protection to the
environment.
Entry standards
This course is open to seafarers who have qualified in accordance with regulation Section A-VI/1 of
the International Convention on Standards of Training, Certification and Watchkeeping for
Seafarers 1978, as amended.
Course certificate
All who are qualified in Basic training for liquefied gas tanker cargo operations programme in
accordance with regulation V/1-2 paragraphs 1 or 2 shall be issued with a certificate of
proficiency.
The number of trainees should not exceed 20 and practical training should be undertaken in
small groups of not more than eight.
Staff requirements
The instructor shall have appropriate training in instructional techniques and training methods
(STCW Code A-I/6, paragraph 7). It is recommended that all training and instruction is given by
qualified personnel experienced in the handling and characteristics of liquefied gas cargoes and
the safety procedures involved. Staff may be recruited among deck and engineer officers of
liquefied gas tankers, and / or fleet superintendents as appropriate.
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Ordinary classroom facilities and an overhead projector are sufficient for most of the Course.
However, dedicated CBT modules to be run on an ordinary PC as well as exercises on an
operational, hands-on liquid cargo handling simulator, will greatly enhance the quality and result
of the course. In such cases sufficient PCs for use by one or two trainees will be required. In
addition, a video player will be required if using videos in the teaching program.
The following equipment should be available:
1.
2.
3.
4.
5.
6.
7.
8.
9.
Resuscitator;
Breathing apparatus;
Portable oxygen meter
Portable combustible-gas detector;
Portable tankscope / Multi point flammable gas (infra- red gas analyser);
Portable toxic-gas detector & chemical absorption tubes;
Portable multigas detector;
Personal multigas detector; and
Tank evacuation equipment.
Use of Simulators
The revised STCW Convention sets standards regarding the performance and use of
simulators for mandatory training, assessment or demonstration of competence. The general
performance standards for simulators used in training and for simulators used in assessment of
competence are given in Section A-l/12. Simulator -based training and assessment is not a
mandatory requirement for this Basic training for liquefied gas tanker course. However, it is
widely recognized that well-designed lessons and exercises can improve the effectiveness of
training.
If using simulator-based training, instructors should ensure that the aims and objective of these
sessions are defined within the overall training program and that tasks are selected so as to
relate as closely as possible to shipboard tasks and practices. Part D 3 included herein gives
the sample exercises which can be performed to enhance the learning. Instructors should refer
to STCW, Section A-I/12, Part 2.
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Design
The core technical and academic knowledge, understanding and proficiency are set out in
Table A-V/1-2-1 of the STCW as amended in 2010, adopted by IMO as part of the 2010 STCW
Convention as shown below:
Standard of competence:
1.
Every candidate for certification in basic training for liquefied gas tanker cargo
operations shall:
.1
.2
The content of the Model course is designed to suit the trainers teaching this course for
optimum delivery, ensuring high degree of consistency and adherence to STCW 2010
standards leading to certification in basic training for liquefied gas tanker cargo operations.
The flow of topics mentioned in Part C, is thus reflecting, how the trainer should design their
course and delivery and is for guidance only.
To show consistency and adherence to STCW 2010, as given in table A-V/1-2-1, a mapping is
provided below for easy reference from STCW's competences and training outcomes to the
topics covered in this Model course.
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STCW 2010 Table A-V/1-2-1 Mapping of IMO Model course 1.04 topics
STCW 2010 Table A-V/1-2-1
S.No
Competence
Knowledge, Understanding
and Proficiency
1.0 Basic knowledge of
liquefied gas tankers:
.1
types of liquefied gas
tankers
.2
general arrangement and
construction
2.0 Basic knowledge of
cargo operations:
.1
piping systems and valves
.2
cargo handling equipment
.3
loading, unloading and
care in transit.
.4
emergency shutdown ESD
System
.5
tank cleaning, purging,
gas freeing and inerting
3.0
.1
.2
.3
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Topic
Basic knowledge of
liquefied gas tankers:
Cargo operations:
2.1
2.2
2.3
2.4
2.5
Physical properties of
liquefied gases
including
3.1
3.2
3.3
3.4
properties and
characteristics
pressure and temperature;
Including vapour pressure /
temperature relationship
types of electrostatic charge
generation
chemical symbols
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STCW 2010 Table A-V/1-2-1
S.No
Competence
Knowledge, Understanding
and Proficiency
.4
chemical symbols
4.0
Knowledge and
understanding of tanker
safety culture and safety
management
.1
.2
.3
.4
.5
.6
.7
.8
.9
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Topic
Knowledge and
understanding of
tanker safety culture
and safety
management
Basic knowledge of 5.1
the hazards
5.2
health hazards
environmental hazards
5.3 reactivity hazards
5.4 corrosion hazards
5.5 explosion and flammability
hazards
5.6 sources of ignition,
5.7 electrostatic hazards
5.8 toxicity hazards
5.9 vapour leaks and clouds
5.10 extremely low temperatures
5.11 pressure hazards
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STCW 2010 Table A-V/1-2-1
S.No
Competence
Knowledge, Understanding
and Proficiency
.10 extremely low
temperatures
.11 pressure hazards
6.0 Basic knowledge of
hazard controls:
.1
.2
.3
.4
.5
.6
anti-static measures
ventilation
segregation
cargo inhibition
.7
.8
atmospheric control
7.0
Understanding of
information on a Material
Safety Data Sheet
(MSDS)
Function and proper use
of gas-measuring
instruments and similar
equipment
Proper use of safety
equipment and
protective devices,
including:
breathing apparatus and
tank-evacuating
equipment
Apply occupational
8.0
health and safety
precautions
and
measures
.1
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Topic
Basic knowledge of
hazard controls:
importance of cargo
compatibility
6.1
6.2
6.3
6.4
6.5
6.6
anti-static measures
ventilation
segregation
cargo inhibition
6.7
6.8
atmospheric control
8.1
importance of cargo
compatibility
gas testing
gas testing
7
Understanding of
information on a
Material Safety Data
Sheet (MSDS)
Function and proper
use of gas-measuring
instruments and
similar equipment
Proper use of safety
equipment and
protective devices,
including:
8.2
8.3
8.4
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STCW 2010 Table A-V/1-2-1
S.No
Competence
Knowledge, Understanding
and Proficiency
.2
protective clothing and
equipment
.3
resuscitators
.4
rescue and escape
equipment
9.0 Basic knowledge of safe
working practices and
procedures in
accordance with
legislation and industry
guidelines and personal
shipboard safety
relevant to liquefied gas
tankers including:
.1
precautions to be taken
when entering enclosed
spaces
.2
precautions to be taken
before and during repair
and maintenance work
.3
safety measures for hot
and cold work
.4
electrical safety
.5
ship/shore safety checklist
10.0 Basic knowledge of first
aid with reference to a
Material Safety Data
Sheet (MSDS)
Carry out fire-fighting 11.1 Tanker fire organization
operations
and action to be taken
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Topic
Basic knowledge of
safe working practices
and procedures in
accordance with
legislation and
industry guidelines
and personal
shipboard safety
relevant to liquefied
gas tankers including:
10
11
Basic knowledge of
first aid with reference
to a Material Safety
Data Sheet (MSDS)
Fire safety and fire
fighting operations
9.1
9.2
9.3
9.4
9.5
precautions to be taken
when entering enclosed
spaces
precautions to be taken
before and during repair and
maintenance work
safety measures for hot and
cold work
electrical safety
ship / shore safety checklist
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STCW 2010 Table A-V/1-2-1
S.No
Competence
Knowledge, Understanding
and Proficiency
11.2 Special hazards
associated with cargo
handling and
transportation of liquefied
gases in bulk
11.3 Fire-fighting agents used
to extinguish liquefied gas
fires
11.4 Fixed fire-fighting foam
system operations
11.5 Portable fire-fighting foam
operations
11.6 Fixed dry chemical system
operations
12.0 Basic knowledge of Spill
containment in relation
to fire-fighting
operations
Respond to
13.0 Basic knowledge of
emergencies
emergency procedures
including emergency
shutdown
Take precautions to 14.0 Basic knowledge of the
Prevent pollution of
effects of pollution on
the environment
human and marine life
from the release of
liquefied gases
15.0 Basic knowledge of
shipboard procedures to
prevent pollution
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12
13
Topic
Basic knowledge of
Spill containment in
relation to fire-fighting
operations
Emergency
Basic knowledge of emergency
Procedures
procedures including
emergency shutdown
14
Pollution Prevention
15
Basic knowledge of
shipboard procedures
to prevent pollution
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STCW 2010 Table A-V/1-2-1
S.No
Competence
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Knowledge, Understanding
and Proficiency
16.0 Basic knowledge of
measures to be taken in
the event of spillage,
including the need to:
16.1 report relevant information
to the responsible persons
16.2 assist in implementing
shipboard spillcontainment procedures
16.3 prevent brittle fracture
Topic
16
Basic knowledge of
measures to be taken
in the event of
spillage, including the
need to:
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Note: - Other equivalent teaching aids may be used as deemed fit by the instructor.
A1
A2
A3
A4
R1
SOLAS 1974, International Convention for the Safety of Life at Sea, 1974 (SOLAS
1974) as amended
STCW 78 as amended, International Convention on Standards of Training, Certification
and Watchkeeping for Seafarers,
MARPOL 73/78, International Convention for the Prevention of Pollution from Ships,
1973/1978 (MARPOL 73/78) Consolidated Edition 2011
IG Systems, Inert Gas Systems (IMO-860E)
MFAG Medical First Aid Guide for Use in Accidents Involving Dangerous Goods
(iMO251 E)
IGC Code, International Code for the Construction and Equipment of Ships Carrying
liquefied gases in Bulk (IGC Code), as amended (IMO-IOOE)
ISM Code, International Safety Management Code (ISM Code) (IMO-117E
R2
R3
R4
R5
R6
R7
Details of distributors of IMO publications that maintain a permanent stock of all IMO
publications may be found on the IMO website at http://www.imo.org
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T1
SIGTTO, Liquefied Gas Handling Principles on Ships and in Terminals, 3rd ed.. (London,
Witherby and Company Ltd.
Basic Safe Tanker Handbook for Oil, Chemicals, LPG and LNG, Ed.2011
Capt. KSD Mistree, MAREX Publication, C - 209, Morya House, New Link Road,
Andheri (w), Mumbai - 400 053. India.
Tel.: 91 22 6734 9292 Fax: 91 22 6734 9222
T2
Bibliography (B)
B1
B2
Tanker Safety Guide Liquefied Gas, International Chamber of Shipping. 2nd ed. 95.
Ship to Ship Transfer Guide (Liquefied Gas), International Chamber of Shipping/Oil
Companies International Marine Forum, (London, Witherby & Co. Ltd., 2005)
Draeger-Tube Handbook, Draeger-Tube Handbook 11th ed. (DragerSicherheitstechnik
GmbH, Revalstrasse 1, D-23560 Lubeck, Germany, 1998) (ISBN 3-926762-06-3)
Code of Safe Working Practices, PO Box 29, Norwich, NR3 1GN Telephone
orders/General enquiries: 0870 600 5522 Fax orders: 0870 600 5533 E-mail:
customer.services@tso.co.uk Textphone 0870 240 3701
Tanker Management Self Assessment, Witherby Publications, 32/36 Aylesbury street
London. www.witherbys.com ISBN 10: 1905331231 ISBN 13: 9781905331239
B3
B4
B5
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Lectures
As far as possible, lectures should be presented within a familiar context and should make use
of practical examples. They should be well illustrated with diagrams, photographs and charts
where appropriate, and be related to matter learned during seagoing time.
An effective manner of presentation is to develop a technique of giving information and then
reinforcing it. For example, first tell the trainees briefly what you are going to present to them;
then cover the topic in detail; and, finally, summarize what you have told them. The use of an
overhead projector and the distribution of copies of the transparencies as trainees handouts
contribute to the learning process. The areas where the Instructors can use various
instructional methods while delivering the course are broadly recognized as:
Laboratory/Classroom/Simulator (Demonstration/Exercises)
The topics identified to be taken up as practicals in the course outline that
follows, can be taught by demonstration method. Like explanation method
mentioned above, this method is always linked in some way to other instructional
strategies. The Instructor would need to identify very clearly what is the activity,
and then would need to perhaps break it down in various steps. In case the
trainees are allowed to practice, then proper supervision for assessment would
be required, which will require the whole class to be divided into various groups,
with every group being supervised by Instructors, qualified to conduct this
course.
Traditional methods of instruction have been largely adopted for maritime
training courses, however with the advancement of technology and reducing
costs, the industry is witnessing the increasing introduction of technology into the
classrooms, including the use of simulation technology.
The use of simulators provides a learning platform where all three elements of
learning; knowledge, skill and attitude can be integrated into a valuable learning
experience.
The Manila Amendments to the STCW Convention have also embraced the use
of simulators for training, evaluation and assessment of competence. It is
therefore important that the potential for utilizing this valuable training tool is
realized to the maximum.
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STW 44/3/8
Annex, page 23
It is suggested that relevant topics of cargo operation which are marked with an
Asterisk (*) in the course outline that follows, should be taught on a simulator.
When the simulator sessions are used to cover the topics mentioned in this
course, then the method of assessment that can be used is also provided in the
Part E of this Model course and is for guidance only.
When simulators are used for training and assessing competence, the Instructors
are guided to the STCW 2010 requirements with relation to simulators and to the
training and assessment. The Simulator should conform to the requirements of
STCW 2010 Regulation I/12 (use of simulators), section A-I/12, parts 1 and 2,
Performance Standards for the simulator and simulator training objectives and
sections B I/12, (guidance regarding the use of simulators). The training and
assessment should conform to the requirements of STCW 2010 Regulation I/6
(training and assessment), section A-I/6, training and assessment (mandatory)
4.3.1, 4.3.2 and 6.5 and section B-I/6 (guidance regarding training and
assessment).
In case simulators cannot be used owing to unavailability of such facility within
the training institute / centre, screenshots of some topics have been appended in
Part D - Instructor's Manual for assisting the training. These screen shots can be
incorporated in power point presentations or projected on board, to elucidate
understanding and thus assist effective teaching and learning to take place.
Classroom (Case-studies)
Case-studies which form supporting instructional methods can be incorporated
within the core methods mentioned above or used as the major method for
developing certain types of learning in a session covering certain topic. Group
work, questioning, discussion and role-play are also some of the examples of
supporting instructional methods, which the Instructors can incorporate and use
in a lesson.
Case- studies, appended in Part D of this model course is a capture of a real life
situation. Instructors are requested to carefully select the case-studies that will
form a part of training of this model course. Cases should typically provide
information outlining a problem based scenario, where decisions involving value
judgments are involved. Although the information actually provided within cases
can vary considerably with some containing very detailed and comprehensive
information, whereas others simply documenting the key elements of a situation,
the latter is preferred.
The Instructors should ensure that whichever case studies they incorporate
within their lesson plan, it should be interesting and appropriate for the level of
trainees attending the course.
Course Outline
The tables that follow, list the competencies and areas of knowledge,
understanding and proficiency, together with the estimated total hours required
for lectures and practical exercises. Teaching staff should note that timings are
suggestions only and should be adapted to suit individual groups of trainees
depending on their experience, ability, equipment and staff available for training.
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STW 44/3/8
Annex, page 24
COURSE OUTLINE
Total
hours for
lectures
Total hours
for
exercises
Total hours
for
simulators
2.0
3.0
4.0
1.5
1.5
0.5
0.5
1.5
0.5
1.0
0.25
0.50
0.50
0.25
1.5
I:\STW\44\3-8.doc
0.33
0.10
0.10
0.10
0.25
0.10
0.10
0.10
1.0
1.0
1.5
STW 44/3/8
Annex, page 25
5.9
5.10
5.11
6.0
7.0
Total
hours for
lectures
Total hours
for
exercises
Total hours
for
simulators
0.10
0.10
0.10
0.25
0.25
0.12
0.12
0.12
0.12
0.25
0.25
1.5
9.0
I:\STW\44\3-8.doc
0.5
0.25
0.25
0.25
0.25
0.5
0.25
0.5
0.25
1.5
STW 44/3/8
Annex, page 26
10.0
Total
hours for
lectures
Total hours
for
exercises
Total hours
for
simulators
1.5
12.0
0.25
0.25
0.25
0.25
0.25
0.25
0.50
Topic: Emergencies
Competence: Respond to emergencies
13.0
0.50
16.0
I:\STW\44\3-8.doc
0.25
0.25
0.20
0.20
STW 44/3/8
Annex, page 27
16.3
17.0
Case Study
18.0
Total
hours for
lectures
Total hours
for
exercises
Total hours
for
simulators
0.10
1.0
1.5
21
5.5
3.5
30
Notes
It is suggested that relevant topics which are marked with an Asterisk (*) may be taught on a
simulator.
It is suggested that relevant topics which are marked with a Hash (#) may be conducted
separately in any facility which can conduct practical exercises and instruction under approved
and truly realistic training conditions (e.g., simulated shipboard conditions).
It is suggested that relevant topics which are marked with a double Asterisk (**) may be
demonstrated practically or relevant videos to be shown for same.
Teaching staff should note that the hours for lectures and exercises are suggestions only as regards
sequence and length of time allocated to each objective. These factors may be adapted by lecturers to
suit individual groups of trainees depending on their experience, ability, equipment and staff available for
teaching.
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STW 44/3/8
Annex, page 28
Day 1
Day 2
3.0
5.0
6.0
Basic knowledge of
hazard controls:
Inerting, drying and
monitoring techniques
Anti-Static measures
Ventilation
Segregation
Cargo inhibition
Importance of cargo
compatibility
Hydrate control
Cargo tank
atmosphere
monitoring
7.0
Understanding of
information on a
Material Safety Data
Sheet (MSDS) (#)
9.0
Ship/shore safety
checklist (**)/(#)
8.0
3.1
3.2
3.3
3.4
Day 3
10.0
I:\STW\44\3-8.doc
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
9.5
STW 44/3/8
Annex, page 29
1st Period (1.5 Hours)
(0900 - 1030 hrs)
9.1
9.2
9.3
9.4
Day 4
2.4
2.3
11.1
2.3
2.3
2.5
Day 5
11.3
11.4
11.5
11.6
I:\STW\44\3-8.doc
13.0
14.0
15.0
16.0
MEAL BREAK (1200 1300 hrs)
11.2
12.0
Loading, unloading
and care in transit (*)
Tank cleaning,
purging, gas-freeing
and inerting(*)
Basic knowledge of
measures to be taken
in the event of
spillage, including the
need to:
16.1 report relevant
information to the
responsible persons
16.2 assist in implementing
shipboard spillcontainment
procedures
16.3 prevent brittle fracture
17.0 Case studies
4.0
Knowledge and
understanding of
tanker safety culture
and safety
management
STW 44/3/8
Annex, page 30
Tea Breaks: 1030-1100 / 1500-1530
Note:
It is suggested that relevant topics which are marked with an Asterisk (*) may be taught on a simulator.
It is suggested that relevant topics which are marked with a Hash (#) may be conducted separately in any facility which can conduct practical
exercises and instruction under approved and truly realistic training conditions (e.g., simulated shipboard conditions).
It is suggested that relevant topics which are marked with a double Asterisk (**) may be demonstrated practically or relevant videos to be
shown for same.
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 31
COMPETENCE 1
TRAINING OUTCOMES:
Demonstrates a knowledge and understanding of:
1.
2.
Cargo operations:
.1
piping systems and valves
.2
cargo handling equipment
.3
loading, unloading and care in transit.
.4
emergency shutdown ESD System
.5
tank cleaning, purging, gas freeing and inerting
3.
4.
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 32
TOPIC 1
IMO
Reference
Text books
Bibliography
Teaching
aid
1.0
R1,R2, R6
T1, T2, B1
A1, A2
1.1
R1,R2, R6
T1, T2, B1
A1, A2
1.1.1
T1,T2,B1
1.1.2
1.1.3
1.1.4
1.1.5
1.1.6
1.1.7
1.1.8
1.2
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
I:\STW\44\3-8.doc
A1,A2,
A3,A4
STW 44/3/8
Annex, page 33
TOPIC 1
1.2.7
1.2.8
1.2.8.1
1.2.8.2
IMO
Reference
Text books
Bibliography
Teaching
aid
2.0
R2,R4,R6
T1,T2,B1
A1,A2,
A3,A4
2.1
R2,R4,R6
T1,T2,B1
A1,A2,
A3,A4
2.1.1
2.1.2
2.1.3
2.1.4
2.1.5
2.1.6
2.1.7
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STW 44/3/8
Annex, page 34
TOPIC 1
2.1.8
2.1.9
2.1.10
2.1.11
2.1.12
2.1.13
2.1.14
2.1.15
2.1.16
2.1.17
I:\STW\44\3-8.doc
IMO
Reference
Text books
Bibliography
Teaching
aid
STW 44/3/8
Annex, page 35
TOPIC 1
2.2
2.2.1
Instrumentation
2.2.1.1
2.2.1.2
2.2.1.3
2.2.1.4
2.2.1.5
2.2.1.6
2.2.1.7
2.2.1.8
2.2.1.9
2.2.1.10
2.2.2
Pressure-relief
and
-protection system
2.2.2.1
I:\STW\44\3-8.doc
vacuum
IMO
Reference
Text books
Bibliography
Teaching
aid
R2,R4,R6
T1,T2,B1,B3
A1,A2,
A3,A4
STW 44/3/8
Annex, page 36
TOPIC 1
2.2.2.2
2.2.2.3
2.2.2.4
2.2.2.5
2.2.2.6
2.2.2.7
2.2.3.1
2.2.3.3
2.3
2.3.1
2.3.1.1
2.3.1.2
Text books
Bibliography
Teaching
aid
T1,T2,B1,B2
A1,A2,
2.2.3
2.2.3.2
IMO
Reference
I:\STW\44\3-8.doc
A3,A4
STW 44/3/8
Annex, page 37
TOPIC 1
2.3.1.3
2.3.1.4
2.3.1.5
2.3.2
2.3.2.2
2.3.2.3
2.3.2.4
2.3.2.5
2.3.2.6
2.3.3
Cargo compressors
2.3.3.1
I:\STW\44\3-8.doc
IMO
Reference
Text books
Bibliography
Teaching
aid
STW 44/3/8
Annex, page 38
TOPIC 1
2.3.3.2
2.3.3.3
2.4
2.4.1
2.4.2
2.4.5
2.5
2.5.2
2.5.3
2.5.4
Text books
Bibliography
Teaching
aid
R2,R6
T1,T2,B1,B2
A1,A2,
A3,A4
R2,R4,R6
T1,T2,B1,B3,
A1,A2,
2.5.1
IMO
Reference
I:\STW\44\3-8.doc
A3,A4
STW 44/3/8
Annex, page 39
TOPIC 1
3.0
3.1
Properties
3.1.1
3.1.2
3.1.3
3.1.4
3.1.5
3.1.6
3.1.7
3.1.9
Teaching
aid
R2,R5,R6
T1,T2,B1
A1,A2,A3
characteristics
R2,R5,R6
T1,T2,B1
A1,A2,A3
I:\STW\44\3-8.doc
Text books
Bibliography
physical
gases,
3.1.8
and
IMO
Reference
STW 44/3/8
Annex, page 40
TOPIC 1
3.1.10
3.1.11
3.1.12
3.2
3.2.2
3.2.2.1
3.2.2.2
3.2.2.3
3.2.2.4
3.2.2.5
3.2.2.6
Text books
Bibliography
Teaching
aid
T1,T2,B1
A1,A2
3.2.1
IMO
Reference
States of aggregation
Boiling point
Liquid density
Vapour density
Flashpoint
I:\STW\44\3-8.doc
R2,R5,R6
STW 44/3/8
Annex, page 41
TOPIC 1
3.2.2.7
3.2.2.8
3.2.2.9
3.2.2.10
3.2.2.11
3.2.2.12
Types of
generation
3.3.1
3.4
Chemical symbols
States that chemical symbols are used
to denote any liquefied gas.
4.0
4.1
4.3
Text books
Bibliography
Teaching
aid
R2,R6
T1,T2,B1
A1,A2
R2,R6
T1,T2,B1
A1,A2
R1,R2,R7
T1,T2
A1,A2,A3
3.3
4.2
IMO
Reference
electrostatic
charge
STW 44/3/8
Annex, page 42
TOPIC 1
4.4
4.5
I:\STW\44\3-8.doc
IMO
Reference
Text books
Bibliography
Teaching
aid
STW 44/3/8
Annex, page 43
TOPIC 5:
COMPETENCE 2:
TRAINING OUTCOMES:
Demonstrates a knowledge and understanding of:
1.
2.
Hazard controls:
.1
.2
.3
.4
.5
.6
.7
.8
3.
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 44
TOPIC 5
IMO
Reference
Text books
Bibliography
Teaching
aid
5.0
R2,R3,R4,
R5,R6
T1,T2
A1,A2
5.1
R2,R3,R4,
R5,R6
T1,T2
A1,A2
5.2
Environmental hazards
R2,R3,R4,
R5,R6
T1,T2
A1,A2
5.2.1
T1,T2
A1,A2
5.2.2
5.2.3
5.2.4
5.3
Reactivity hazards
5.3.1
5.3.2
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 45
TOPIC 5
5.4
Corrosion hazards
5.4.1
5.4.2
5.5
5.5.1
5.5.2
5.5.3
5.5.4
5.5.5
5.5.6
5.5.7
5.6
Sources of ignition
5.6.1
I:\STW\44\3-8.doc
IMO
Reference
Text books
Bibliography
Teaching
aid
R2,R4,
R5,R6
T1,T2
A1,A2
R2,R4,
R5,R6
T1,T2
A1,A2
R2,R4,
R5,R6
T1,T2
A1,A2
STW 44/3/8
Annex, page 46
TOPIC 5
Electrostatic hazards
5.7.1
5.8
Toxicity hazards
5.8.1
5.8.2
Teaching
aid
R2,R4,
R5,R6
T1,T2
A1,A2
R2,R4,
R5,R6
T1,T2
A1,A2
R2,R3,R4,
R5,R6
T1,T2
A1,A2
5.9
5.9.1
5.9.2
Text books
Bibliography
Static electricity
Hot work
5.7
5.8.3
IMO
Reference
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 47
TOPIC 5
5.9.3
5.9.4
5.10.1
5.10.3
5.11
Pressure hazards
5.11.1
5.11.2
5.11.3
Text books
Bibliography
Teaching
aid
R2,R3,R4,
R5,R6
T1,T2
A1,A2
R2,R3,R4,
R5,R6
T1,T2
A1,A2
5.10
5.10.2
IMO
Reference
6.0
R1,R2,
R6
B1,B3,T1,T2
A1,A2
6.1
Inerting,
drying
techniques
R1,R2,
R4
T1,T2
A1,A2
6.1.1
6.1.2
6.1.3
I:\STW\44\3-8.doc
and
monitoring
STW 44/3/8
Annex, page 48
TOPIC 5
6.1.4
6.1.5
6.1.6
6.1.7
6.1.8
6.1.9
6.1.10
IMO
Reference
Text books
Bibliography
Teaching
aid
R2,R6
T1,T2
A1,A2
R1,R2,
R3,R6
T1,T2,B1,B3
A1,A2
6.2
Anti-static measures
6.2.1
6.2.2
6.3
Ventilation
6.3.1
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STW 44/3/8
Annex, page 49
TOPIC 5
6.3.2
6.3.3
6.3.4
6.3.5
Segregation
6.4.1
6.4.3
6.4.4
Text books
Bibliography
Teaching
aid
6.4
6.4.2
IMO
Reference
6.5
Cargo inhibition
6.5.1
6.6
6.6.1
I:\STW\44\3-8.doc
R2,R6
T1,T2,B1
A1,A2
R2,R6
T2,B1
A1,A2
R2,R3,R6
T1,T2,B1
A1,A2
STW 44/3/8
Annex, page 50
TOPIC 5
6.6.2
6.7
Atmospheric control
6.7.1
6.7.2
IMO
Reference
Text books
Bibliography
Teaching
aid
R1,R2,
R3,R6
B1,B3,T1,T2
A1,A2
R1,R2,R4,
R6
T1,T2,B1,
B2,B3,B4
A1,A2,A4
6.8
Gas testing
6.8.1
7.0
Understanding of information on a
Material Safety Data Sheet (MSDS)
R2,R5,R6
T1,T2,B1
A1,A2
7.1
R2,R5,R6
T1,T2,B1
A1,A2
7.1.1
7.1.2
7.1.3
7.1.4
7.1.5
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 51
TOPIC 5
and understood
7.1.6
7.1.7
7.1.8
7.1.9
I:\STW\44\3-8.doc
IMO
Reference
Text books
Bibliography
Teaching
aid
STW 44/3/8
Annex, page 52
TOPIC 8:
COMPETENCE 3:
TRAINING OUTCOMES:
Demonstrates a knowledge and understanding of:
1.
2.
Safe working practices and procedures in accordance with legislation and industry
guidelines and personal shipboard safety relevant to liquefied gas tankers:
.1
precautions to be taken when entering enclosed spaces
.2
precautions to be taken before and during repair and maintenance work
.3
safety measures for hot and cold work
.4
electrical safety
.5
ship/shore safety checklist
3.
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 53
TOPIC 8
IMO
Reference
Text books
Bibliography
Teaching
aid
A1,A2,A3
8.0
R1,R2,R6
T1,T2,B1,
B3,B4
8.1
R1,R2,R6
T1,T2,B1,
B3,B4
8.1.1
8.1.2
8.1.3
8.1.4
8.1.5
8.1.6
Breathing apparatus
8.1.6.1
8.1.6.2
I:\STW\44\3-8.doc
A1,A2,A3
STW 44/3/8
Annex, page 54
TOPIC 8
8.2.1
8.2.3
8.2.4
8.2.5
8.2.6
8.2.7
8.2.8
Teaching
aid
R1,R2,R6
T1,T2,B1,B2,
A1,A2,A3
R2,R6
T1,T2,B1,B2
A1,A2
R2,R6,
T1,T2,B1,B2
A1,A2
8.3
Resuscitators
8.3.1
8.3.2
8.4
8.4.1
8.4.2
Text books
Bibliography
8.2
8.2.2
IMO
Reference
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 55
TOPIC 8
IMO
Reference
Text books
Bibliography
Teaching
aid
9.0
R1,R2,
R6,R7
T1,T2,B1,
B4,B5
A1,A2,
A3
9.1
R1,R2,
R6,R7
T1,T2,B1,
B4,B5
A1,A2,
A3
9.1.1
9.1.2
9.1.3
9.1.4
9.1.5
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 56
TOPIC 8
9.1.6
9.2
9.2.1
9.2.2
9.2.3
9.2.4
I:\STW\44\3-8.doc
IMO
Reference
Text books
Bibliography
Teaching
aid
R2,R7
T1,T2,B1,
B3,B4,B5
A1,A2
STW 44/3/8
Annex, page 57
TOPIC 8
IMO
Reference
Text books
Bibliography
Teaching
aid
R2,R7
T1,T2,B1,
B4,B5
A1,A2
9.3.1
9.3.2
9.3.3
9.3.4
9.3.5
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 58
TOPIC 8
9.3.6
Text books
Bibliography
Teaching
aid
9.4
Electrical safety
9.4.1
9.4.2
IMO
Reference
I:\STW\44\3-8.doc
R1,R2,
R6, R7
T1,T2,B1,B4
A1,A2
STW 44/3/8
Annex, page 59
TOPIC 8
9.5
9.5.1
9.5.2
9.5.3
9.5.4
9.5.5
10.0
10.1
Displays and
Identify 'health data' from
MSDS
Displays and Identify health hazard criteria
from the IMDG Code Supplement (MFAG)
Displays and explains a Material Safety Data
Sheet for sample products
Identify medical first-aid equipment provided
onboard including oxygen resuscitation
equipment and antidotes for products carried
10.2
10.3
10.4
I:\STW\44\3-8.doc
IMO
Reference
Text books
Bibliography
Teaching
aid
R2
T1,T2,B1
A1,A2
R2
T1,T2,B1
A1,A2
STW 44/3/8
Annex, page 60
TOPIC 11:
COMPETENCE 4:
TRAINING OUTCOMES:
Demonstrates a knowledge and understanding of:
1.
2.
I:\STW\44\3-8.doc
STW 44/3/8
Annex, page 61
TOPIC 11
IMO
Reference
Text books
Bibliography
Teaching
aid
11.0
R1,R2,R4
T1,T2,B1,B4
A1,A2,A3
11.1
R1,R2,R4
T1,T2,B1,B4
A1,A2,A3
11.1.1
States
that
for
planning
and
implementation of an emergency procedure
requires an emergency organization
States that the basic structure of the
emergency organization should consist of
four elements:
command centre
emergency party
back-up emergency party
engineers group or technical team
States the need to identify a senior officer
as being in control during the emergency,
with another senior officer identified as his
deputy
States the general composition and the
task of the command centre
States the general composition and the
task of the emergency party
States the general composition and the
task of the back-up emergency party
States the general composition and the
task of the engineers group
States that all personnel on board should
know their place in the emergency
organization and their duty in case
an emergency procedure is being initiated
States that training and drills especially for
fire fighting, prepare the fire response
organization to become familiar with their
duties and equipment and to respond to
emergencies in a timely and correct
manner.
States that Find, Inform, Restrict and
Extinguish technique is a good maxim
when attending to a Fire emergency
States that the Master must ensure that the
Duty Officer is authorized to stop cargo in
the event of an emergency or if in the
opinion of the Duty Officer such stoppage
is necessary to prevent an emergency
situation
11.1.2
11.1.3
11.1.4
11.1.5
11.1.6
11.1.7
11.1.8
11.1.9
11.1.10
11.1.11
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TOPIC 11
11.1.12
11.2
11.2.1
11.2.2
11.2.3
11.2.4
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IMO
Reference
Text books
Bibliography
Teaching
aid
R1,R2,R4
T1,T2,B1,B4
A1,A2,A3
STW 44/3/8
Annex, page 63
TOPIC 11
11.2.5
11.2.6
11.2.7
11.2.8
11.3.1
11.3.3
Text books
Bibliography
Teaching
aid
R1,R2,R4
T1,T2,B1,B4
A1,A2,A3
11.3
11.3.2
IMO
Reference
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TOPIC 11
11.4
Fixed
fire-fighting
operations
11.4.1
11.5
11.5.1
11.5.2
foam
system
11.6
11.6.1
11.6.2
11.6.3
11.6.4
12.0
12.1
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IMO
Reference
Text books
Bibliography
Teaching
aid
R1,R2,R6
T1,T2,B1,B1,
B4
A1,A2,A3
R1,R2,R6
T1,T2
A1,A2,A3
R1,R2,R6
B1,B2,T1,T2
A1,A2,A3
B1,T1,T2
A1,A2
R2,R6
STW 44/3/8
Annex, page 65
TOPIC 13:
EMERGENCY PROCEDURES
COMPETENCE 5:
Respond to emergencies
TRAINING OUTCOMES:
Demonstrates a knowledge and understanding of:
Emergency procedures including emergency shutdown
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TOPIC 13
EMERGENCY PROCEDURES
IMO
Reference
Text books
Bibliography
Teaching
aid
13.0
Basic
knowledge
of
procedures,
including
shutdown
emergency
emergency
R2,R6,R7
T1,T2,B1
A1,A2
13.1
R2,R6,R7
T1,T2,B1
A1,A2
13.1.1
T1,T2,B1
A1,A2
R1,R2,R6
T1,T2,B1,B4
A1,A2,A3
13.1.2
13.2
Alarms
13.2.1
13.2.2
13.2.3
13.3
Emergency procedures
13.3.1
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TOPIC 13
EMERGENCY PROCEDURES
IMO
Reference
Text books
Bibliography
Teaching
aid
R2,R6,R7
T1,T2,B1,B2
A1,A2
case of an emergency
13.3.2
13.3.3
13.3.4
13.3.5
13.4
13.4.1
13.4.2
13.4.3
13.4.4
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TOPIC 13
EMERGENCY PROCEDURES
13.4.5
is inter linked
In case of LNG ships the Master gas
valve to engine room will close
Inert gas generator will trip
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IMO
Reference
Text books
Bibliography
Teaching
aid
STW 44/3/8
Annex, page 69
TOPIC 14:
COMPETENCE 6:
POLLUTION PREVENTION
Take precautions to Prevent pollution of the environment
2.
3.
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TOPIC 14
POLLUTION PREVENTION
IMO
Reference
14.0
14.1
14.1.1
of
R2,R3
Text books
Bibliography
Teaching
aid
T1,T2,B1
A1,A2
15.0
R2,R3
T1,T2,B1,B2
A1,A2
15.1
R2,R3
T1,T2,B1,B2
A1,A2
16.0
R2,R3
T1,T2,B1
A1,A2,A3
16.1
R2,R3
T1,T2,B1
A1,A2,A3
15.1.1
15.1.2
15.1.3
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TOPIC 14
POLLUTION PREVENTION
IMO
Reference
16.1.1
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Text books
Bibliography
Teaching
aid
STW 44/3/8
Annex, page 72
Introduction
This manual reflects the views of the course designer on methodology and
organization, and what is considered relevant and important in the light of his
experience as an instructor. Although the guidance given here would be of value
initially, the course instructors are advised to work out their own methods and ideas,
refining and developing it further what is found more constructive and discarding those
methods which are not found effective.
The course Instructors should also bear in mind that preparation and planning
constitute a major contribution to effective presentation of the course.
The instructor's manual provides guidance on the material that is to be presented
during the course. The course material reflects the mandatory minimum requirements
for the training and qualifications of officers and ratings on Gas tankers as specified in
paragraph 2 of regulation V/1-2 of the International Convention on Standards of
Training, Certification and Watch keeping for Seafarers 1978, as amended.
The competences mentioned in the above mentioned STCW regulation is broken down
in the following topics is reflecting, how the trainer should design their course and
delivery and is for guidance only.
To show consistency and adherence to STCW 2010, as given in table A-V/1-2-1, a
mapping is provided for easy reference in Part A of this Model course from STCW's
competences and training outcomes to the topics covered in the IMO Model
Course 1.05.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
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15.
16.
The texts used as references throughout the course are given in Part A Course framework and are;
Teaching Aids (A), IMO Reference Books (R), Text books (T), Bibliography (B) and Videos (V).
The course outline and timetable (the scheme of work and lesson plan will replace this word,
when completed and inserted within this Model course) provide guidance on the time
allocations for the course material, but the instructor is free to make adjustments as necessary.
The detailed teaching syllabus must be studied carefully, and lesson plans or lecture notes
compiled where appropriate.
It will be necessary to prepare material for use with overhead projectors or for distribution to
trainees as handouts. Some sketches and diagrams are provided at the end of the guidance
notes. These will provide examples of the kind of material, which is useful in supporting the
presentation of the course.
Whenever Knowledge based learning objectives are stated, these can be defined, stated or
listed as given along with the drawings appended herein. Where explanations and descriptions
are stated Guidance notes herein below is provided in Part D2.
Throughout the course it is important to stress that, aboard ships rules and regulations must be
strictly observed and all precautions taken to maximise safety and minimize harmful effects to
the environment.
Topics marked with an asterisk (*) could be better taught using a Liquefied Gas Tanker
Cargo and Ballast Handling Simulator.
Guidance Notes
Learning Objectives
1.0
This will be a brief review of the way Liquefied gas tankers have evolved. The material in the
Tanker safety guide for Liquefied gases will give all required details needed for the instructor.
The level at which the lecture should be based will depend on the level and responsibilities of
the trainees.
1.1.3. Describes generally LPG ships
Fully refrigerated LPG Ships
These ships are designed to carry fully refrigerated cargoes at near atmospheric pressure at
temperatures down to -50 "C. The cargoes include LPG, ammonia and in most cases, some of
the chemical gases, butadiene, propylene and VCM.
Ships of the fully refrigerated type generally have capacities above 15,000 m 3, up to about
85-100,000 m3. These ships are normally equipped with between three and six cargo tanks,
extending almost the full beam of the ship. Double bottom tanks are fitted, together with topside
or complete side ballast tanks. Prismatic free-standing tanks (Type A) are the most common,
being supported on wooden chocks and keyed to the hull to permit expansion and contraction.
This type of tank usually has an internal centreline bulkhead to improve stability and reduce
sloshing. The secondary barrier is normally provided by the use of special steels for all hull
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structure which may be exposed to the cargo if a rupture of the primary barrier occurs. The hold
is inerted when flammable cargoes are carried or filled with dry air for non-flammable cargoes.
1.1.4. Describes generally LEG ships
Ethylene Carriers
In appearance this type of ship is very similar to the semi-pressurised ship, and competes for
the same cargoes when the ethylene market is less profitable. The main difference is the
design temperature of -104 C for the cargo containment system.
The sizes are typically between 2000-12,000 m3, and the cargo tanks are independent pressure
vessel Type C tanks made from nickel-steel or stainless steel. For the Type C tanks, no
secondary barrier is required. The ships are normally fitted with a double bottom.
A cascade type refrigeration plant is fitted, of sufficient capacity for reliquefaction of ethylene
carried fully refrigerated at -104 C, and the cargo tanks normally have a thicker insulation than
on fully refrigerated LPG ships. A few ethylene carriers of small size have been built with
semi-membrane tanks and secondary barrier.
1.1.5. Describes generally LNG ships
Methane / LNG Carriers
Methane/LNG is carried at atmospheric pressure at -163 C in cargo tanks made from
aluminium, nickel-steel or stainless (austenitic) steel. Insulation is fitted and most LNG ships
are more correctly described as fully insulated since they usually have no reliquefaction plant;
boil-off gas is normally burnt in the main propulsion machinery.
The ships are large, mainly from 40,000 to 135,000 m3, with four to six cargo tanks of Type A, B
or membrane. The space between the primary and secondary barriers is inerted. However, for
Type B systems with only a partial secondary barrier, the hold space is usually filled with dry
air. A full double bottom and side ballast tanks are fitted.
The arrangement of primary and secondary barriers varies widely from system to system
1.1.6. Describes generally chlorine ships
Chlorine is a very toxic gas that can be produced by the dissolution of sodium chloride in
electrolysis. Because of the toxicity of Chlorine it is therefore transported in small quantities,
and must not be transported in a larger quantity than 1200 m3. The gas carrier carrying chlorine
must be type 1G with independent type C tanks. That means the cargo tank must at the least,
lie B/5 "Breadth/5" up to 11,5 meter from the ships side. To transport Chlorine, the requirements
of IMO IGC code, chapters 14, 17 and 19 must be fulfilled. Cooling of Chlorine requires indirect
cargo cooling plants.
The difference of Chlorine and other gases transported is that Chlorine is not flammable.
Chlorine is utilised in producing chemicals and as bleaching agent in the cellulose industry.
1.1.7. Describes LEG / LPG / Chemical ships
Gas carriers that are allowed to transport ethylene oxide or propylene oxide must be specially
certified for this. Ethylene oxide and propylene oxide have a boiling point at atmospheric
pressure of respectively 11oC and 34oC and are therefore difficult to transport on tankers
without indirect cargo cooling plants. Ethylene oxide and propylene oxide cannot be exposed to
high temperature and can therefore not be compressed in a direct cargo cooling plant. Ethylene
oxide must be transported on gas tanker type 1G.
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Chemical gases like propylene, butadiene and VCM are transported with medium-sized
atmospheric pressure tankers from 12000 m3 to 56000 m3.
Semi-pressurised gas carriers are also used in chemical gas trade and then in smaller quantity
as from 2500 m3 to 15000 m3.
Chemical gases are transported all over the world, and especially to the Far East where there is
a large growth in the petro-chemical industry.
1.1.8. Describes briefly Tank containment systems of a gas carrier
The information below is much more than what is necessary to be stated in the basic level
course. It is recommended that the instructor shows the diagrams of the containment systems
and gives only a brief description of the different containment systems mentioned herein under.
A cargo containment system is the total arrangement for containing cargo including, where
fitted:
The basic cargo tank types utilized on board gas carriers are in accordance with the list below:Independent Type 'A': Some other types such as:
Independent Type 'B': Internal insulation Type '1'
Independent Type 'C': Internal insulation Type '2'
Membrane: Integral
Independent Tanks
Independent tanks are completely self-supporting and do not form part of the ship's hull
structure. Moreover, they do not contribute to the hull strength of a ship. As defined in the
IGC Code, and depending mainly on the design pressure, there are three different types of
independent tanks for gas carriers: these are known as Type 'A', "B' and 'C'.
Type 'A' Tanks
Type 'A' tanks are constructed primarily of flat surfaces. The maximum allowable tank design
pressure in the vapour space of for this type of system is 0.7 barg; this means cargoes must be
carried in a fully refrigerated condition at or near atmospheric pressure (normally below 0.25
barg).
The IGC Code stipulates that a secondary barrier must be able to contain tank leakage for a
period of atleast15 days.
Type 'B' Tanks
Type 'B' tanks can be constructed of flat surfaces or they may be of the spherical type. This
type of containment system is the subject of much more detailed stress analysis compared to
Type 'A' systems. These controls must include an investigation of fatigue life and a crack
propagation analysis. The most common arrangement of Type 'B' tank is a spherical tank. This
tank is of the Kvaerner Moss design.
There are Type 'B' tanks of prismatic shape in LNG service. The prismatic Type 'B' tank has the
benefit of maximizing ship-deck. Where the prismatic shape is used, the maximum design
vapour space pressure is, as for Type 'A' tanks, limited to 0.7 barg.
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Type 'C' Tanks
Type 'C' tanks are normally spherical or cylindrical pressure vessels having design pressures
higher than 2 barg. The cylindrical vessels may be vertically or horizontally mounted. This type
of containment system is always used for semi-pressurized and fully pressurized gas carriers.
In the case of the semi-pressurized ships it can also be used for fully refrigerated carriage,
provided appropriate low temperature steels are used in tank construction. For a
semi-pressurized ship the cargo tanks and associated equipment are designed for a working
pressure of approximately 5 to 7 barg and a vacuum of 0.5 barg. Typically, the tank steels for
the semi-pressurized ships are capable of withstanding carriage temperatures of -48 degree C
for LPG or -104 degree C for ethylene. (Of course, an ethylene carrier may also be used to
transport LPG.)
In the case of a typical fully pressurized ship (where the cargo is carried at ambient
temperature), the tanks may be designed for a maximum working pressure of upto 18 barg.
Type 'C' tanks as fitted in a typical fully pressurized gas carrier. With such an arrangement
there is comparatively poor utilization of the hull volume; however, this can be improved by
using intersecting pressure vessels or bi-lobe type tanks which may be designed with a taper at
the forward end of the ship. This is a common arrangement in semi-pressurized ships.
Membrane Tanks (membrane 0.7 to 1.5 mm thick)
The concept of the membrane containment system is based on a very thin primary barrier
(membrane 0.7 to 1.5 mm thick) which is supported through the insulation. Such tanks are not
self-supporting like the independent tanks. An inner hull forms the load bearing structure.
Membrane containment systems must always be provided with a secondary barrier to ensure
the integrity of the total system in the event of primary barrier leakage.
Semi-Membrane Tanks
The semi-membrane concept is a variation of membrane tank system. The primary barrier is
much thicker than in the membrane system, having flat sides and large roundish corners. The
tank is self-supporting when empty but not in the loaded condition. In this condition the liquid
(hydrostatic) and vapour pressures acting on the primary barrier are transmitted through the
insulation to the inner hull as is the case with the membrane system. The corners and edges
are designed to accommodate expansion and contraction.
Integral Tanks
Integral tanks form a structural part of the ship's hull and are influenced by the same loads
which stress the hull structure. Integral tanks are not normally allowed for the carriage of
liquefied gas if the cargo temperature is below -10 degree C. Certain tanks on a limited number
of Japanese-built LPG carriers are of the integral type for the dedicated carriage of full
refrigerated butane.
Internal Insulation Tanks
Internally insulated cargo tanks are similar to integral tanks. They utilize insulation materials to
contain the cargo. The insulation is fixed inside ship's inner hull or to an independent loadbearing surface. The non-self-supporting system obviates the need for an independent tank
and permits the carriage of fully refrigerated cargoes at carriage temperatures as low as -55
degree C.
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Internal insulation systems have been incorporated in a very limited number of fully refrigerated
LPG carriers but, to date, the concept has not proved satisfactory in service.
2.0
The Instructor should point out that carrying and handling liquefied gas cargo onboard poses
significant potential hazards including risk of injury or death, threats to environment and each
person working on a gas carrier and terminal ashore needs to understand the risks involved,
obtain the necessary training and take all the needed precautions.
2.1.1
The loading lines and pipes mentioned here refer to gas carrier's cargo handling system. This
involves liquid lines, vapour lines, condensate return lines, lines to vent mast, pipes inside the
cargo tank and seawater pipes to the cargo cooling plant. All loading lines on gas carrier: liquid
lines, gas lines and lines to vent mast have the same requirements as pressure vessels
regarding of temperature and pressure they are meant to handle. All welding on pipes
exceeding 75 mm in diameter and 10 mm wall thickness or more must be X-rayed and classed
by the class company. The same regulation do we have on flanges and spool pieces also. All
loading lines outside the cargo tank must be produced by material with melting point no less
than 925 0C. The loading lines on gas carriers are mostly produced of stainless steel, but low
temperature nickel steel is also in use. All loading lines with an outside diameter of 25 mm or
more must be flanged or welded. Otherwise, lines with an outside diameter less than 25 mm
can be connected with treads. Loading lines designed for cargo with low temperature, less than
10 0C must be insulated from the ship hull. This is to prevent the ship hull to be cooled down to
below design temperature. The hull has to be protected against cold cargo spill under spool
pieces and valves on all liquid lines. This is done with wood planks or plywood. To prevent cold
cargo spill on the hull plates, a drip tray must be placed under the manifold flanges. All lines
that are thermally insulated from the hull must be electrically bonded to the hull with steel wire
or steel bands. On each flange on lines and pipes where gaskets is used, there must be
electrical bonding with steel wire or steel band from flange to flange.
2.2.1.4 Describes generally a float gauge
The float gauge is widely used in all tanker work and consists of a float attached by a tape to an
indicating device which can be arranged for local and remote readout. A typical float gauge
which is normally installed in a tubular well or with guide wires, with a gate valve for isolation so
that the float can be serviced in a safe atmosphere. The float must be lifted from the liquid level
when not in use; if left down, the fluctuation in level at sea will damage the tape-tensioning
device. Float gauges cannot normally register a liquid level of less than four inches in depth.
2.3.1.1 Describes generally the unloading system
If a simulator is available, it would be best to let the candidates locate and operate the
equipment to understand its operational requirements with due diligence to safety. The
Unloading system comprises of:
Cargo pumps
Fitted aboard refrigerated gas tankers are normally of the centrifugal type, either deepwell or
submerged, operating alone or in series with a deck-mounted booster pump where cargo
heating is required on discharge to pressurise storage from a refrigerated vessel. Some fully
pressurised ships discharge cargo by pressurising tanks and require booster pumps to assist in
the transfer of cargo ashore.
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Deepwell pumps
Deepwell pumps are the most common type of cargo pump for LPG carriers. Figure in part D2
shows a typical deepwell pump assembly. The pump is operated electrically or hydraulically by
a motor, which is flange-mounted outside the tank. The drive shaft is guided in carbon bearings
inside the discharge tube and these bearings are in turn lubricated and cooled by the cargo flow
up the discharge tube.
The impeller assembly is mounted at the bottom of the cargo tank and will frequently comprise
two or three impeller stages together with a first stage inducer; this latter is an axial flow
impeller used to minimise the NPSH requirement of the pump. The shaft sealing arrangement
consists of a double mechanical seal with an oil flush. The accurate installation and alignment
of the motor coupling, thrust bearing and mechanical oil seal is important.
Submerged pumps
This type of pump is used on all LNG carriers, and on many of the larger fully refrigerated LPG
carriers. The pump assembly and electric motor are close coupled and installed in the bottom of
the cargo tank; power is supplied to the pump motor through copper or stainless steel sheathed
cables, which pass through a gastight seal in the tank dome and terminate in a flameproof
junction box. Submerged pumps and their motors are cooled and lubricated by the cargo and
are therefore susceptible to loss of flow rate damage. Figure in Part D2 shows a typical
submerged pump/motor assembly.
Booster pumps
Booster pumps are also of the centrifugal type and may be either vertical in-line pumps deckmounted in the appropriate discharge line and driven by an "increased safety" electric motor or,
alternatively, horizontal pumps installed on deck or in the cargo compressor room driven
through a gastight bulkhead by an electric motor installed in the electric motor room.
Figures appended in Part D2 show examples of these types of pump. The particular pumps
shown are fitted with a double mechanical seal, which is methanol-flushed and pressurised
between the seals.
CARGO HEATERS AND CARGO VAPORIZERS
A cargo heater is used to heat the cargo when discharging to an ambient shore tank.
A cargo heater is also used when loading a fully pressurised gas carrier with cargo with
temperature less than 100C. Seawater or oil is used to heat the cargo in the cargo heater.
It is of importance to remember that the cargo heater is full of water and have good flow out
with water before letting cold cargo into the heater. Fully pressurised gas carriers are carriers
that are designed to transport condensed gases at ambient temperature, and they normally
don't have cargo cooling plant
Heat exchanger
Heat exchangers are utilised in several different parts of cargo handling on gas carriers, as heat
exchangers (cargo heater), condensers for cargo cooling plant, vapour risers, super heaters
and oil coolers for compressors.
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In most of the heat exchangers seawater is used as the medium on gas carriers, which the
products are cooled or heated against.
The heat exchangers that are used for cargo handling must be designed and tested to tolerate
the products the gas carrier is certified for. Heat exchangers that are used for cargo handling
are considered as pressure vessels, and IMO requires one safety valve if the pressure vessel is
less than 20 m3 and two safety valves if it is above 20 m3. All heat exchangers that are used for
cargo handling must be pressure tested and certified by the gas carriers Class Company.
3.0
It has to be explained here that transport requirements IGC Code) divide chemical cargoes and
Gas cargoes based on the Vapour pressures exerted by the Liquids.
IMO divides liquefied gases into the following groups:
The IMO gas carrier code define liquefied gases as gases with vapour pressure higher than 2,8
bar with temperature of 37,8 0C. IMO gas code chapter 19 defines which products that are
liquefied gases and have to be transported with gas carriers. Some products have vapour
pressure less than 2,8 bar at 37,8 0C, but are defined as liquefied gases and have to be
transported according to chapter 19 in IMO gas code. Propylene oxide and ethylene oxides are
defined as liquefied gases. Ethylene oxide has a vapour pressure of 2,7 bar at 37,8 0C. To
control temperature on ethylene oxide we must utilise indirect cargo cooling plants. Products
not calculated as condensed gas, but still must be transported on gas carriers, are specified in
IMO's gas code and IMO's chemical code. The reason for transportation of non-condensed
gases on gas carriers is that the products must have temperature control during transport
because reactions from too high temperature can occur. Condensed gases are transported on
gas carriers either by atmospheric pressure (fully cooled) less than 0,7 bars, intermediate
pressure (temperature controlled) 0,5 bars to 11 bars, or by full pressure (surrounding
temperature) larger than 11 bars. It is the strength and construction of the cargo tank that is
conclusive to what over pressure the gas can be transported.
3.2.1
states of aggregation
boiling point
liquid density
vapour density
flashpoint
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States of aggregation
Most substances can exist in either the solid, liquid or vapour state. In changing from solid to
liquid (fusion) or from liquid to vapour (vaporisation), heat must be given to the substance.
Similarly in changing from vapour to liquid (condensation) or from liquid to solid (solidification),
the substance must give up heat. The heat given to or given up by the substance in changing
state is called latent heat. For a given mass of the substance, the latent heats of fusion and
solidification are the same. Similarly, latent heats of vaporisation and of condensation are the
same, although different from the latent heat of fusion or solidification. Fusion or solidification
occurs at a specific temperature for the substance and this temperature is virtually independent
of the pressure. Vaporisation or condensation of a pure substance, however, occurs at a
temperature which varies widely dependent upon the pressure exerted on the substance. The
latent heat of vaporisation also varies with pressure. For liquefied gases, we are not concerned
with the solid state since this can only occur at temperatures well below those at which the
liquefied gas is carried. Temperatures, pressures and latent heats of vaporisation, however, are
of fundamental importance. This data may be presented in graphical form appended in Part D2
which gives curves for vapour pressure, liquid density, saturated vapour density and latent heat
of vaporisation against temperature for methane.
The boiling point of a substance is the temperature at which the vapour pressure of the liquid
equals the pressure surrounding the liquid and the liquid changes into a vapour state.
Liquid and vapour densities The density of a liquid is defined as the mass per unit volume
and is commonly measured in kilograms per decimetre cubed (kg/d m3). Alternatively, liquid
density may be quoted in kg/litre or in kg/m3. The variation with temperature of the density of a
liquefied gas in equilibrium with its vapour is shown for propane in curve y' in Figure appended
in Part D2 of as can be seen, the liquid density decreases markedly with increasing
temperature. This is due to the comparatively large coefficient of volume expansion of liquefied
gases. All liquefied gases, with the exception of chlorine, have liquid relative densities less than
one. This means that in the event of a spillage onto water these liquids would float prior to
evaporation.
4.0
It addresses Safety and Health (OHSAS 18001 Occupational Health and Safety Assessment
Systems) procedures and guidelines.
The process of a safety management system addresses safety aspects of shipboard activities
and lays requisite guidelines. These guidelines requires due diligence combined with
professional judgment and good seamanship which is inherited from within an organization and
which assists the development of a safety culture.
The requirements of work permit, personal protective equipment and health safeguards are
tools to assist the ship-staff with the sole objective of safely carrying out onboard activities and
to further an aim of:
"Zero Accident and Incidents"
The safety management basic components are:
Policy Establish within policy statements what the requirements are for the
organisation in terms of resources, defining management commitment and
defining targets
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5.0
While the carriage of liquefied gases incurs its own special hazards, some of its features are
less hazardous than those of the heavier petroleum. Hazards peculiar to carriage of liquefied
gases:
a.
b.
c.
Cold from leaks and spillages can affect the strength and ductility of ship's
structural steel.
Contact by personnel with the liquids, or escaping gases, or with cold pipe work
can produce frost burns.
Rupture of a pressure system containing liquefied gas could release a massive
evolution of vapour. Features of liquefied gas carriage resulting in a reduction of
hazard compared with normal tanker operation:
(i)
(ii)
(iii)
5.5.6: Flammability diagram with respect to: Flammable range, Flammable zone
and shows how use of inert gas enhances safety in operations
The Instructors should sketch and explain the flammability diagram for some flammable gases
separately showing the differences in LFL and UFL. It must be explained how addition of inert
gas reduces the UFL and raises the LFL.
As concentration of inert gas in the mixture is increased the flammable range decreases until
the oxygen content reaches a level at which no mixture can burn.
5.5.7 Explains Boiling Liquid Expanding Vapour Explosion (BLEVE):
A BLEVE occurs when a vessel containing liquefied gas under pressure (e.g., propane)
catastrophically fails, usually as a result of external fire exposure (i.e., a pool fire under the
vessel or a jet- or torch-type fire impinging on the vessel walls). The fire pressurizes the vessel,
causing the relief valve to open, which allows the pressurized vapor to escape. As the liquid
level in the vessel decreases, the flames impinge on the vessel wall above the liquid level. The
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vessel wall rapidly heats up due to the poor heat transfer provided by the vapor on the inner
side of the vessel wall. The wall weakens and then tears, resulting in a sudden catastrophic
failure of the vessel.
The consequences of a BLEVE event are (i) the overpressure blast wave that is generated as a
result of the rapid expansion of the superheated liquid, (ii) the fireball thermal radiation
generated as a result of the rapid combustion of the released flammable material, and (iii) the
potential vessel fragments that may be propelled as missiles. BLEVE events have the potential
for causing injury and/or facility damage at significant distances from the source of the BLEVE.
A sufficiently large potential difference between the piping system and the hull may
result in a discharge of static electricity, which may cause a spark, which could result in
the ignition of a flammable gas/air mixture.
To minimize the risks of static discharges the cargo system must be properly bonded through to
the hull. This is done by the fitting of bonding straps at each flange in the cargo pipe-work and
on the mounting of pumps and valves.
The bonding straps may be made from steel, copper or other conducting material. Copper
bonding straps, particularly the type made up by woven strands can deteriorate over time, with
the result that the strap either disintegrates or fails to conduct.
It should be emphasized here in the training that:
ALL BONDING ARRANGEMENTS ON BOARD MUST BE THE SUBJECT OF REGULAR
INSPECTIONS WITH RECORDS OF THE INSPECTIONS MAINTAINED.
When maintenance work is carried out on the cargo system, checks must be made to ensure
that the bonding arrangements have been reinstated correctly.
Due to the risk of static electricity, neither steam nor CO2 should be injected into a tank,
compartment or pipe system, which contains a flammable mixture.
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5.11.1 Explains high and low pressure effects
EFFECT OF PRESSURE
Gases expand with increase in temperature and if the space available is limited as in a
tank or an isolated section of pipeline, the pressure will increase. This characteristic can
lead to various hazards and makes monitoring of pressure very critical. It is very
important that pressure sensors are well maintained and accurately calibrated.
High and Low Pressure Effects
As pressures either above or below the design range can cause damage, it should
always be kept within the specific maximum and minimum values.
Cargo trapped in a closed system (e.g. between closed valves) can cause changes in pressure.
Cold liquid can heat up and cause the pressure to rise and warm vapour (especially butane and
butadiene) can condense and reduce pressure.
Care should be taken to ensure that cold liquid does not remain in a closed system and the
necessary precautions concerning cargo vapour should be taken.
5.11.2 Describes pressure surge or liquid hammering
A pressure surge or wave resulting when a fluid (usually a liquid but sometimes also a gas) in
motion is forced to stop or change direction suddenlyChanges in pressure arise in pipelines
when there is a change in fluid velocity. These changes are the result of events such as pump
switching and valve operation.
5.11.3 Describes how effect of surge pressure is minimised or avoided
When using the ship and shore ESD systems consideration must be given to avoiding
escalation of an incident by creating disruptive surge pressures at the ship/shore cargo
connection by the over-rapid closure of ESD valves against cargo flow. it is desirable that the
maximum cargo flow rate be limited to that which will not cause excessive surge pressure
should ESD valves downstream of the cargo connection be closed, at their known rate of
closure, against the cargo flow.
6.0
Liquid Petroleum Gas (LPG) and Liquefied Natural Gas (LNG) are petroleum product switch are
quite safe when contained in their storage containers. Released into the atmosphere they
condense the moisture in the air producing vapour clouds these vapour clouds pose a serious
hazard to the safety of personnel and plant alike should they be ignited. Knowing how to
properly respond to releases of LNG and LPG product, scan makes the difference between a
small leak or a catastrophic event which kills many people and destroys property.
No LPG - LNG release should be considered a minor event. The potential for it to rapidly
escalate into a catastrophe is ever present. The relevant sections of ISGOTT and ICS Tanker
Safety Guide (Liquefied Gas) shall be consulted.
The major hazards of liquefied gases derive from their flammability and their low
temperatures. Some chemical gases may also be toxic and corrosive. Most vapour
clouds are also heavier than air and so tend to remain at ground level.
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Explain the term 'inhibitor' and the reason for and use of inhibitors
Self Reaction is the most common form is polymerization. In general, cargoes which may
self-react are inhibited before shipment. There are no inhibitors available for certain cargoes
that can self react (e.g. ethylene oxide) and these have to be carried under an inert gas blanket.
The inhibitor may not boil off with the cargo and it is possible for reliquefaction systems to
contain uninhibited cargo, therefore, the system should be drained or purged with inhibited
cargo when shut down.
Many inhibitors are much more soluble in water than in the cargo, and care should be taken to
exclude water from the system; otherwise the concentration of inhibitor in the cargo could be
considerably reduced.
Similarly, the inhibitor may be very soluble in antifreeze additives if these form a separate
phase, thus shipper's instructions on use of antifreeze should be observed. If the ship is
anchored in still conditions, the inhibited cargo should be circulated daily to ensure a uniform
concentration of inhibitor.
Certain cargoes (e.g., Vinyl Chloride) even though inhibited may be protected by inert gas.
Care should be taken to ensure that a positive pressure of inert gas is maintained at all times
and that the oxygen concentration never exceeds 0.1% by volume.
For butadiene cargo, the compressor discharge temperature must not exceed 60oC.
It must be stated here to the trainees that:
A cargo required to be inhibited should not be loaded until a certificate giving following
details is provided by manufacturer:
The action to be taken should the length of the voyage exceed the effective lifetime of the
inhibitors:
Ensure that the expiry date of the inhibitor is appropriate for the contemplated voyage.
Typically, the inhibitor should not expire within six months of loading the cargo. In case of
language difficulties, do not hesitate to suggest the correct wording for this certificate.
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7.0
A Material Safety Data Sheet (MSDS) provides basic information on a cargo carried on board
gas Carriers. This includes the properties and potential hazards of the material, how to use it
safely and what to do in an emergency.
The MSDS is an essential starting point for the development of a complete health and safety
program for the material. MSDS are prepared by the manufacturer or supplier of the material.
They tend to be general in nature, since they provide summarized information which tries to
address all reasonably anticipated uses of the material.
The information on MSDS's is organized into sections. The specific names and content of these
sections can vary from one supplier's MSDS to another, but are often similar to the 16 sections
of the ANSI Standard MSDS. The MSDS are also included in the CHRIS Code and the ICS
data sheets appended in part D2.
As per Chapter 18 'Operating requirements' of IGC Code'
8.0
A full description of the physical and chemical properties necessary for the
safe containment of the cargo;
Action to be taken in the event of spills or leaks;
Counter-measures against accidental personal contact;
Fire-fighting procedures and fire-fighting media;
Procedures for cargo transfer, gas-freeing, ballasting, tank cleaning and
changing cargoes;
Special equipment needed for the safe handling of the particular cargo;
Minimum allowable inner hull steel temperatures; and
Emergency procedures.
This learning objective can be done with practical demonstration along with explanations as
given below:
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GAS DETECTION EQUIPMENT
Gas detection equipment is required by IGC Codes for the following reasons:
The equipment can be fixed or portable. There are several types like infrared detectors, thermal
conductivity meters, combustible gas detectors, tank scopes, chemical absorption indicators
and oxygen indicators. All personnel should fully understand the purpose and limitations of
vapour detection equipment, whether fixed or portable.
A permanently installed Vapour detection system must cover cargo compressor room, motor
room, hold spaces, air locks, CCR and other enclosed spaces within cargo area. Each Gas
Carrier should carry at least two each oxygen, percent volume hydrocarbon, LEL and toxic gas
analyzers. Vessels carrying chemical gases should also have suitable detection tubes for the
cargo being carried. In addition, vessels should have personal hydrocarbon and oxygen
analyzers which can be carried in a pocket or on belt.
The following common precautions should be taken:
The maker's handbook should be consulted before use or calibration.
All oxygen and hydrocarbon analyzers should be checked for correct operation before each
use.
Zero setting should be checked regularly and reset if necessary before the instrument is
calibrated. Pure nitrogen should be used if possible, when carrying out zero settings.
The instrument should be calibrated frequently throughout its operating range. Concentration
and composition of the span gas should be accurately known. Recalibration should be logged
on or near the instrument. Supplies of span gas should be replenished as necessary.
For calibration of oxygen detectors, use clean and uncontaminated air.
Tubes or liquids for equipment using chemical absorption or reaction principles have a limited
shelf life and they should be replaced before it is exceeded.
All sample lines should be clean, unobstructed, leak tight and connected to the correct points.
During routine testing, sample gas should be introduced from different points with a view check
each sampling point in rotation.
If upper and lower sample points are provided, the correct one should be used for the relative
density of the cargo carried and care should be taken to change sample points when changing
cargoes, if required. Lower level sampling heads should be in use for all cargoes except
Ammonia.
Due precautions should be taken when using portable detectors while taking readings.
Portable sensing equipment should not be used in flammable atmospheres, unless it is
intrinsically safe.
Pumps, filters, flame screens and other components should be well maintained to ensure
accurate readings.
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Catalytic filament elements should not be exposed to water or oil vapour.
Remote and local readouts should be checked to ensure accuracy.
Calibration of most fixed instruments depends on flow rate and fluctuations can cause
inaccuracy, flow should be kept steady and flows from each point should be balanced. Battery
voltage of portable instruments should be checked frequently to ensure accurate readings.
Audible and visual alarms for fixed gas detection system should be operational at all times.
During routine inspection of the fixed system, sampling cycle should be checked for correct
operation. System should sample and analyze each sampling head at intervals not exceeding
30 minutes.
In case of high % LEL is detected in the hold spaces, carry out purging operation of the hold
space to reduce the %LEL to below alarm condition. In case the alarm condition still exists and
levels are not reducing please report to office immediately and carry out all requirements as per
"Containment Failure" emergency checklist.
Protective devices
Proper and correct use of personal protective equipment (PPE) and clothing is one of the basic
safety measures to be taken on the ship.
Various personal protective equipment such as boiler suits, safety shoes, hand gloves, hard
hats, ear muffs, safety harness, goggles, face masks, working vests etc are provided on board
ships. Correct combinations of such equipment should be worn to protect from hazards when
working.
The Master and Safety officer shall ensure that each crewmember wears proper protective
equipment and clothing when working.
Improper use and faulty personal protective equipment (PPE) may in itself cause a hazard.
PPE, therefore, should always be maintained in good condition and it should be checked
properly each time prior using it.
Proper training shall be undertaken for correct usage of PPE.
REFER TO "CODE OF SAFE WORKING PRACTICES" FOR THE DUTIES AND PRINCIPLES
GOVERNING THE GUIDANCE ON SAFE PRACTICES WHICH ARE REQUIRED TO BE
FOLLOWED.
Safety Equipment
SOLAS regulations lay down specific requirements for standards of safety equipment. Some of
these regulations require that a relevant part of the Code of safe working practices should be
consulted and the principles and guidance applied.
More details about Safety Equipment regulations are contained in chapter 14 of the
International Gas carrier Code relevant to Gas carriers.
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8.4.2
Experience has shown that the rescue of persons from within an enclosed space can be
extremely hazardous and especially in cases of oxygen deficiency. These risks are heightened
where access to a compartment can only be achieved with difficulty. In such circumstances, it is
vital that rescuers always pay strict attention to the correct procedures and the use of proper
equipment and do not rush into ill-considered action. Many fatalities have resulted from failure
to comply with these basic rules. For training purposes, full-scale exercises in non-hazardous
atmospheres have been found extremely beneficial. Exercises involving weighted dummies,
with rescuers wearing protective equipment and breathing apparatus, are essential if rescue
teams are to be properly prepared for a real emergency. Classroom drills may be conducted
with such simulations. They can perform resuscitation on dummies. It is important to
understand that very less time is available if the persons stop breathing, the brain cells starts
degenerating. If resuscitation is not done timely, the victim even if revived will be living as a
vegetable for the rest of his life.
9.0
Basic knowledge of safe working practices and procedures in accordance
with legislation and industry guidelines and personal shipboard safety relevant
to liquefied gas tankers
The purpose of this lecture is to provide those serving on ships carrying liquefied gases in bulk
with information on recognised good practice. It is recommended to state here the use of The
Tanker Safety Guide (Liquefied Gases). It provides the best general guidance currently
available on safe procedures.
For the purpose of promoting consistent and uniform safe working practices it is recommended
that a copy of this Guide be kept - and used - on board all gas carriers.
The Guide deals primarily with operational matters and good safety practices.
It should be borne in mind that in all cases the advice given in this Guide is subject to any local
or national regulations that may be applicable. In addition, terminal operators have their own
safety procedures which could affect the cargo handling operations and procedures to be
adopted in emergencies. It is necessary for all personnel working on board gas tankers to be
aware of, and to comply with, these regulations and procedures. They will be highlighted by the
use of the Ship/Shore Safety Checklist.
9.2.4
Repairs and maintenance work must be stopped when working in the concerned area.
Additionally, the cause of the presence of gas concentration must be investigated into and the
same and eliminated. Other adjoining spaces must be checked for similar defects.
9.3.1
Explains that hot work outside the main machinery spaces (and in the main
machinery spaces when associated with fuel tanks and fuel pipelines) must take into
account the possible presence of flammable vapours in the atmosphere, and the
existence of potential ignition sources
Hot work means any work requiring the use of electric arc or gas welding equipment, cutting
burner equipment or other forms of naked flame, as well as spark generating tools. It covers all
such work, regardless of where it is carried out aboard a ship, including open decks, machinery
rooms and the engine room.
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Repair work outside the engine room which necessitates hot work should only be undertaken
when it is essential for the safety or immediate operation of the ship, and no alternative repair
procedure is possible.
Hot work outside the engine room (and in the engine room when associated with fuel,
lubrication or cargo systems) must be prohibited until the requirements of national legislation
and other applicable regulations have been met, safety considerations taken into account, and
a hot work permit has been issued. This may involve the master, owners' superintendent, shore
contractor, terminal representative and port authority as appropriate.
Hot work in port at a gas terminal is normally prohibited. If such work becomes essential for
safety or urgent operational needs, then port regulations must be complied with. Full liaison
must be arranged with port and terminal authorities before any work is started and must take
into account the possible presence of flammable vapours in the atmosphere, and the existence
of potential ignition sources.
9.3.4
Explains that Hot work in dangerous and hazardous areas should be prohibited
during cargo, ballast, tank cleaning, gas freeing, purging or inerting operations
No hot work must be undertaken inside a compartment until it has been cleaned and ventilated,
and tests of the atmosphere in the compartment indicate 21% oxygen content by volume, not
more than 1% LFL and it is free from toxic gases. It is important to continue ventilation during
hot work. No hot work should be undertaken on the open deck unless the area is free from
flammable vapour and all compartments, including deck tanks, within a radius of at
least 30 metres around the working area have been washed and freed of flammable vapour
and / or inerted.
All sludge, cargo-impregnated scale, sediment or other material likely to give off flammable or
toxic vapour, especially when heated, should be removed from an area of at least 10 metres
around all hot work. All combustible material such as insulation should either be removed or
protected from heat.
Adjacent compartments should either be cleaned and gas freed to hot work standard, freed of
cargo vapour to not more than 1% by volume and kept inerted, or completely filled with water.
No hot work should be undertaken in a compartment beneath a deck tank in use.
Care should be taken to ensure that no release of flammable vapour or liquid can occur from
non-adjacent compartments that are not gas-free.
No hot work should be carried out on bulkheads of bunker tanks in use. An adjacent fuel oil
bunker tank may be considered safe if tests using a combustible gas indicator give a reading of
not more than 1% LFL in the ullage space of the bunker tank, and no heat transfer through the
bulkhead of the bunker tank will be caused by the hot work.
All pipelines interconnecting with cargo spaces should be flushed, drained, vented and isolated
from the compartment or deck area where hot work will take place.
Hot work on pipelines and valves should only be permitted when the item needing repair has
been detached from the system by cold work, and the remaining system blanked off. The item
to be worked on should be cleaned and gas freed to a safe-for-hot work standard, regardless of
whether or not it is removed from the hazardous cargo area.
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Emphasize that All other operations utilizing the cargo or ballast system should be
stopped before hot work is undertaken, and throughout the duration of the hot work. If
hot work is interrupted to permit pumping of ballast or other operations using the cargo system,
hot work should not be resumed until all precautions have been re-checked, and a new hot
work permit has been issued.
10.0
Basic knowledge of first aid with reference to a Material Safety Data Sheet
(MSDS)
The First Aid Measures section on a Material Safety Data Sheet (MSDS) provides
recommendations that describe measures that trained first aid providers can take at the scene
of a chemical gas exposure, to minimize injury and disability, before obtaining medical
assistance.
It is recommended here that the Instructor should conduct a tabletop exercise, simulated with
an injury and use of MSDS should be carried out to give the trainee a more practical approach.
11.2
Special hazards associated with cargo handling and transportation of liquefied
gases in bulk
The requirements for fire-fighting equipment are laid down by national and international
regulations and are not covered in this guide. General fire-fighting theory is included in the
International Safety Guide for Oil Tankers and Terminals (ISGOTT) and ICS Tanker Safety
Guide (Liquefied Gas).
Company regulations will be tailored to individual ships, and will cover organisation and training
of personnel and maintenance of fire-fighting equipment. Fire fighting cannot be successful
unless all equipment is operational and all personnel are well trained in the use of the
equipment and in emergency procedures.
11.2.1 Explain the need to be alert to the fact that toxic fumes may enter the
accommodation and an evacuation of non-essential crew and visitors may become
necessary
In case of release of toxic vapours, if the cargo vapour is heavier than air it may accumulate on
deck and enter accommodation spaces. The safety precautions should therefore be observed.
Regulations require that superstructures are designed with certain portholes fixed shut and
openings positioned to minimise the possibility of vapour entry. These design features should
not be modified in any way.
All doors, portholes and other openings to gas-safe spaces should be kept closed during cargo
operations. Doors should be clearly marked if they have to be kept permanently closed in port,
but in no circumstances should they be locked.
Mechanical ventilation and air conditioning units should be stopped if there is any possibility of
vapour being drawn into the accommodation.
Summing it up, the trainee should be made to understand the need to be alert to the fact that
toxic fumes may enter the accommodation and an evacuation of non-essential crew and visitors
may become necessary.
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11.2.4 States that "jet fire" should be allowed to burn till fuel is exhausted or cut off. Flames
emanating from such fire could be bent by using water spray and could be bent by as much
as 90 degrees.
11.2.6 Explains that it is very essential for the ship's staff to know and understand the
various properties of the cargo well. The MSDS sheets are the best guides for
understanding the cargo
The MSDS has independent sections which describe any fire hazards and other special
hazards associated with the cargo carried. The information can be used to select the
appropriate type of fire extinguishers and to plan the best response to a fire. Much of the
information is intended for emergency response personnel. If the Cargo is a potential fire
hazard, special handling precautions are stated.
The information in Fire and explosion section, combined with information from the Handling &
Storage and the Stability & Reactivity Data sections, can be extremely useful.
General instructions for responding to an accidental release or cleaning up a spill are provided
in the relevant sections.
11.3.3 Use of Dry Powder
It is not beneficial to use low expansion foam or water for liquefied gas fires because their
application increases the rate of vaporization. Dry powder is used instead, although it provides
a negligible cooling effect. Cooling is required to prevent re-ignition until all liquid has dispersed
and the area is free from flammable vapour. It is best achieved by water from fitted spray
systems or hand hoses. Sprays from hand hoses are excellent in protecting firefighters from the
radiant heat of a liquefied gas fire.
11.4
It is not beneficial to use low expansion foam or water for liquefied gas fires because their
application increases the rate of vaporization.
Foam, will not extinguish a liquefied gas fire and, requires to be applied to a substantial depth.
For liquefied gases, therefore, foam is only appropriate for use in bounded areas and for this
reason is only found at terminals and is not provided on gas carriers.
Foam Mains Where pipelines for foam solution or concentrate are provided the lines should
have a number of accessible take off (hydrant) points which should be spaced not more than
two or three standard hose lengths apart. The take off (hydrant) points generally consist of a
header fitted with two outlets individually valved and fitted with a fire hose connection suitable
for the particular type of fire hose coupling in use locally. Isolating valves should be fitted so as
to maintain the integrity of the line in the event of fracture. Suitable pipeline drain valves and
wash out facilities should be provided. A foam solution pipeline of this type should cater for a
design minimum of 115 cubic metres / hour of solution. Foam concentrate can be distributed
through a smaller bore pipe system to the tanks supplying the inductors of fixed or mobile foam
making appliances. Fixed pipelines for generated (aerated) foam are of limited value owing to
pressure losses in the system and lack of projection
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11.5.2 Describes Applicator foam systems & portable foam extinguisher as:
-
Medium expansion foam is used for Applicator foam. It has an expansion ratio from
about 15:1 up to 150:1. It is made from the same concentrates as high expansion foam,
but its aeration does not require a fan. Portable applicators can be used to deliver
considerable quantities of foam on to spill fires, but their throw is limited and the foam is
liable to be dispersed in moderate winds. Foam applicators are a supplement to the
foam monitors .Sheltered areas not reachable by the foam monitors can be covered by
a foam applicator. This gives increased flexibility. Different applicators are available,
covering varying needs for proportioning ratio, Typically, an applicator needs to be
supplied with a fire hose and a foam concentrate container and is stored in a foam
station
11.6
Fixed dry chemical installation is the most suitable for fighting fire on a gas tanker. The
powder flows out as a free flowing cloud. It is quite effective in dealing with a gas fire/
liquid fire on a jetty or on the deck of a tanker and can also be used in confined spaces.
It is especially useful on burning liquids escaping from leaking pipelines and joints. It is a
non-conductor and therefore suitable for dealing with electrical fires. It must be directed
into the flames.
Dry chemical powder has a negligible cooling effect and affords no protection against
re-ignition e.g. from hot metal surfaces. Certain types of dry chemical powder can cause
a breakdown of a foam blanket and only those labelled 'foam compatible' should be
used in conjunction with foam. Dry chemical powder clogs and becomes useless if it is
allowed to become damp when stored or when extinguishers are being filled.
A fire-extinguishing unit with two or more monitors, hand hose lines or a combination
thereof should have independent pipes (with a manifold at the powder container), unless
a suitable alternative means is provided to ensure proper performance. Where two or
more pipes are attached to a unit, the arrangement should be such that any or all of the
monitors and hand hose lines capable of simultaneous or sequential operation at their
rated capacities.
Where fixed piping is provided between the powder container and a hand hose line or
monitor, the length of piping should not exceed that the length which is capable of
maintaining the powder in a fluidized state during sustained or intermittent use and
which can be purged of powder when the system is shut down.
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11.6.3 Describes Monitors and Hand held hose length requirements
-
The maximum discharge rate should be such as to allow operation by one man. The
length of a hand hose line should not exceed 33 m (108.3 ft). Hand hose lines and
nozzles should be of weather-resistant construction or stored in weather resistant
housing or covers and be readily accessible.
The System Capacity requirements of DCP should be of sufficient quantity and stored in
each container to provide a minimum 45 seconds discharge time for all monitors and
hand hose lines attached to each powder unit.
12.0
Significant pool fires are not likely on liquefied gas tankers decks because the amount of liquid
which can be spilled & contained is limited. The arrangement of the tanker's deck, with its
camber and open scuppers will allow liquid spillage to flow quickly and freely away over the
tanker's side. In case of cargo leakage, open scuppers on gas carriers are an important feature
to allow cold liquids to escape quickly to reduce risk of metal embrittlement and the possibility
of small pool fires on a tanker's deck.
12.1
It is better to allow a liquid pool f ire to burn under controlled conditions. Fire should not be
extinguished unless flow of gas can be immediately stopped. Stop leak if it can be done without
risk. If a leak or spill has not ignited, use water spray to disperse the vapours and to protect
personnel attempting to stop a leak. Prevent from fire or dilution from entering streams, sewers,
or drinking water supply. Use water to cool equipment, surfaces and containers exposed to fire
and excessive heat. For large fire the use of water curtains or monitor nozzles may be
advantageous to further minimize personnel exposure.
13.0
Basic knowledge of Emergency procedures, including emergency
shutdown
An emergency shutdown procedure should be agreed between ship and shore, formally
recorded and signed by both the ships and terminal representative.
The agreement should designate in which cases the operations have to be stopped
immediately.
Due regard should be given to the possible introduction of dangers associated with the
emergency shutdown procedure.
13.3
EMERGENCY PROCEDURES
If an incident occurs during cargo operations the duty officer's first action must be to stop cargo
handling operations using the 'Emergency shutdown system (ESDS)
When loading, ships are expected to activate the shore ESD system before activating the
ship's ESDS
Where ship and shore ESD systems are linked, activation of ESD from one end will also
activate the ESD at other end.
Where a Quick Connect Disconnect Coupling (QCDC) is included in the hard-arms,
activation of shore ESD 2 will initiate the release process for hard-arms.
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When there is any possibility of liquid going overboard emergency procedures given in
SOPEP / SMPEP / VRP should be complied with.
Ship-specific emergency checklists should be referred to avoid missing out on critical actions
during any emergency.
14.0
Pollution is a major problem that is affecting the ocean and the rest of the environment.
Pollution in the ocean directly affects ocean organisms and indirectly affects human health and
resources. Release of toxic gases and wastes, dumping of other harmful materials are all major
sources of pollution in our environment.
Pollutants found in the ocean may cause seafood to be dangerous to human health. The effect
on humans from contaminated seafood may include birth defects and nervous system damage.
Other waste has been known to cause viral and bacterial diseases. This type of pollution can
be stopped by watching what pollution we are letting into the environment.
Air Pollution
Air pollution consists of solid particles and gases. Many pollutants are carcinogens. People who
breathe in these poisons are at a higher risk for asthma and reproductive-system damage.
According the U.S. Environmental Protection Agency, birth defects can also be caused by air
pollution. A 1995 study found a link between air pollution and increased deaths from
cardiovascular and respiratory problems. Humans are not the only living creatures affected by
toxic air pollutants. Some toxins, settle onto plants and into water sources that are then
consumed by animals. The health effects of these poisons are then magnified up the food
chain. Animals that are at the top of the food chain end up with the largest concentrations of
toxins in their bodies.
15.0
It is the responsibility of the master or those in charge of transfer operations involving cargo or
bunkers to know the applicable pollution prevention regulations and to ensure that they are not
violated. Exercises should be held to train personnel in accordance with the Shipboard Marine
Pollution Emergency Response Plan and recorded.
There is a danger of violating regulations if ballast taken in different waters is discharged in
another port. If ballast has to be taken it may be necessary to exchange it in deep waters during
the passage. Some terminals have specific requirements in this respect, and the master should
ensure that they are observed.
16.0
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If the spillage is contained in a drip tray, the contents should be covered or protected to prevent
accidental contact and allowed to evaporate unless the drip tray is fitted with a drain when the
liquid should be drained off. Liquefied gases quickly reach equilibrium and visible boiling
ceases; this quiescent liquid could be mistaken for water and carelessness could be
dangerous. Water jet should never be directed onto the contents of a drip tray.
If liquefied gases spill on to the sea, large quantities of vapour will be generated by the heating
effect of the water. This vapour may create a fire or health hazard, or both. Great care should
be taken to ensure that such spillage does not occur especially when disconnecting cargo
hoses.
17.0
The trainer may use the case studies appended in this IMO model course.
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APPENDIX 1
DIAGRAMS FOR USE BY THE INSTRUCTOR
PRINT OFF AS HANDOUTS
OR
USE FOR OHP TRANSPARENCIES
IF SUITABLY ENLARGED
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LNG Liquefied
Natural Gas
Methane, some
Ethane
LPG Liquefied
Petroleum
Gases
Butane,
Propane &
Mixture
Liquefied
Gases
Ammonia
Ethylene
Chemical
Gases
Vinyl Chloride
Butadiene
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Figure 1.1 (I) BLOCK DIAGRAM DESCRIBING GAS TANKER TYPES AND THE
RELATIONSHIP BETWEEN THE CARGO CARRIED, CARRIAGE CONDITION AND THE
CARGO CONTAINEMENT SYSTEM NORMALLY USED.
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Figure 2.4 (A) ESD Reset LIQUID CARGO HANDLING SIMULATOR LPG
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Figure 2.5(C) COOLING DOWN OF A CARGO TANK, USING LIQUID FROM SHORE AND
VAPOUR RETURN
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Figure 3.1 (A) LIST OF LIQUEFIED GASES SUITABLE FOR TRANSPORT IN DIFFERENT
SHIP TYPE GAS CARRIER (AS LISTED IN IMO GAS CARRIER CODES)
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Figure 5.5 (C) FLAMMABILITY DATA FOR SOME LIQUEFIED GASES
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Figure 6.5
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APPENDIX 2
INSTRUCTOR SIMULATOR GUIDANCE NOTES
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The simulator is designed to provide training for normal operational procedures and for the
input of abnormal or mal-function conditions. It is important that the trainees achieve a
satisfactory level of competence under normal conditions before proceeding to abnormal
operations due to the introduction of faults.
The exercises should provide the trainees with the most realistic impression of actually being in
a cargo control centre aboard ship. Realism is important for this type of learning process. For
this reason, if the simulator has an associated sound system, it should be used.
Exercise scenarios
The content of a scenario is governed to a large extent by the units and systems that are being
simulated.
The syllabus used for the basic gas tanker course has been structured to provide some
flexibility in this respect, and the scenarios can be prepared using those syllabus elements
which match a specific simulator design.
For this course, scenarios should be designed to cover the operational areas contained in the
syllabus; for example:
The familiarization scenarios should aim at making the trainees not only feel "at home" with the
units and systems being simulated, but should also provide some "hands-on" experience with
the controls and some of the more basic equipment and operations, such as valves, pumps,
pipe systems, instrumentation, filling and emptying tanks etc.
The operational scenarios should aim at providing experience in preparing and carrying out the
various tasks and procedures that are involved with the safe transportation of liquefied gases in
bulk. If the institution does not have Simulators then the simulator photographs appended in
Appendix 1 Part D can be used to project and let the trainees trace out and execute the
operations.
The trouble-shooting scenarios should be designed to provide experience in identifying
malfunctions and faults, and applying remedial procedures. It should be noted that most
simulator designs can introduce a large number of malfunctions and faults. In this course, the
scenarios can only deal with a few faults because of time constraints. The course implementer
is free to introduce additional faults if time allows or to change the faults to comply with a
particular simulator design.
Monitoring the exercises
During the exercises the instructor should monitor the trainees' progress and record particular
events which relate to safety or correct procedure in the exercise, making a summary for use
during debriefing. However, even an experienced instructor may occasionally find things going
wrong when trainees are trying to control all the parameters and actions involved in an exercise
and any resulting incidents should be noted and discussed during debriefing.
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If a second instructor is available, he should assist in monitoring the trainees in their work. His
task will vary according to the trainees' abilities and competence. He will be involved not only in
the briefing and debriefing activities but also when the trainees become more experienced,
assisting and guiding them in the use of the equipment. He should follow their work closely but
should avoid interrupting them and save important observations for debriefing.
Debriefing
The time spent on debriefing should generally occupy between 10 and 15 per cent of the total
time used for simulator exercises. Various facilities may be used in debriefing, such as
playback (in which the whole exercise is recorded and any sequence is available for
discussion), multi-channel recorder or data-logging equipment or snap shots.
The instructor should refer to the summary made during the exercise, raise important points
and direct the discussion among the trainees. He should encourage them to examine critically
the actions taken during the exercises. He should try to avoid imposing his own views, but
should ensure that the trainees have used safe and correct procedures at all times.
Guidance on specific subject areas
The guidance notes which follow contain advice on the treatment of the subject areas listed in
the course outline. The instructor should develop a methodology based on his own experience,
together with the advice and guidance provided with the simulator being used in the course.
Each simulator will have its own layout and entails a different format to be prepared by the
instructor.
The cargo handling plant, its systems and equipment in general arrangement (cargo
liquid, vapour, condensate and Inert gas and Ballast pipelines line)
CCR panels and Monitor panel, the instrumentation being used and what parameters are
indicated and recorded
The CCR control panels, identification of valves
The alarms and trips that are fitted and what they protect, location of ESD
Opening and closing valves
Starting and stopping pumps/compressors
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Using a checklist to prepare the simulator for handling ballast and transferring ballast from
one tank to another tank
Using a checklist to prepare the simulator for loading cargo and filling a cargo tank.
Cargo compressor line up (including cooling water system) and starting procedure.
Explanation of the Loadicator functions, trim, draft, heel
Line up for discharge of cargo from tanks
Use of Fixed gas detector
Use of portable gas detector and identification of sample points
Debriefing:
Check if all systems understood and interconnection of systems in simulator. Discuss if
relationships with previous theory are properly understood.
Students to familiarize with the students station based on the following guidelines.
Forward View
1.
2.
3.
4.
5.
6.
7.
Loading and discharging valves of the tank. Operate and notice the indicator bar;
Gas valves i.e. vapour line valve. Check the operating method;
Condensate lines valves for spraying re-liquefaction line return;
Gas Sample detection (T,M,B) & forward and aft;
Methanol injection lines valve can be seen and operated;
Hold eductor valve is also present, but not connected to any system; and
On the vapour manifold check for vapour concentration.
AFT View
1.
Loading / discharging / gas valves can be operated;
2.
Sight glass for local reading during top off;
3.
Sample checking on liquid line;
4.
Discharge pumps pressure _ visible;
5.
Pump local start and stop;
6.
Ullages of tanks;
7.
Pressure inside the tank;
8.
Condensate line pressure and temperature;
9.
Hold pressure; and
10. Tank Intermediate bulk head valve.
Control box with 2 Normal and Emergency cargo pumps.
Theses valves can be operated from deck console and PC's.
Loading & discharging valves can also be operated only from CCR.
This view is in the compressor room.
1.
2.
3.
4.
5.
Below the low pressure chamber (Gas inlet section from tank). We have the compressor
cooling water system. Observe the valves operating the system where the cooling water
is directed, right thru the LP and HP chamber's and re circulated;
Note the thermometer temp's on the system to ensure cooling water never freezes;
Notice the hand turning requirements for the compressor shaft, which is required to be
carried out just before, starting the comp;
Lube oil cooling water system has to be operated prior to starting the compressor;
Temps of the Lube oil cooler inlet and outlet are required to be monitored;
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6.
7.
8.
9.
10.
Just before starting the compressor on zero load, start the lube oil pump and switch off
after starting the compressor;
Condensate line valves to be opened as required follow the flow of gases coming out from
HP compressor;
The discharge HP compressor can be feed to the condenser or the Hot- gas line, for
pushing line cargo or into the tank sump to flush off ROB cargo;
The condenser has got salt water in and out line with a thermometer indicating the temp;
and
An ethane vent line is provided to vent out the lighter ethane faction from the accumulator.
Cooling system
FW system of the compressor and L.O. cooler is present and is always on. Notice the temp.
inlet and outlet of cooler can be monitored in the CCR also.
CCR have got tank and hold pressure gauges. Cargo Main and emergency pump amp- reading
pump discharge pressure, level gauges etc.
Inert gas Pressure,Temp, dew point & O2 are displayed.
Additionally tank 3 & 4 CCR monitor will be displayed in lieu of I G information.
Starting & stopping of hydraulic valves.
Control air press - fire / bilge / G.S. pump control's along with suction & discharge pressure.
Top gauges are manifold liquid & Vapour line, Pressure for fwd and aft lines.
2nd set of gauges represent all 5 comp. discharge pressures:
-
Capacity controls for remote and local operations have to be set from deck console;
Compressor room and motor exhaust fans can be stated and stopped;
Ethane vent valves can be operated from here;
record of all tank inside, outside can be seen on graphics; and
verification of temp. at individual locations can be checked by using the up and down
points.
Monitoring of alarms / tank data / comp. data / tank pressure and temp trends and comp.
pressure and temp trends can be monitored.
Under Misc. liquid / gas line hydraulic oil and control air pressure can be monitored.
-
CCR Operations
Starting and stopping of cargo pump can be done from CCR as well as deck console. (as well
as PC).
Discharge and comment for all 3 pumps can be monitored from the pup up screen. Inert gas
valves to hold top and bottom can be indicated in CCR.
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Covers the Manifold area valve and Tank No. 3 cargo pump discharge / condensate / gas
valves.
Cover indicating valves for the compressor room / manifolds of vapour line coming from tank &
condensate line manifold going to tanks & liquid line.
Inert gas units indicates going into holds& cargo tanks:
-
Trace ballast lines from the tanks for ballasting & deballasting.
Eductor line to be traced; and
There is a No.2. SW relic plant with ballast system.
Diagram of the vessel cargo system, Loadicator and Loading zone chart; and
Mollier diagram/thermodynamic properties of cargo being loaded.
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Simulator Condition:
Briefing:
Trainees should be told that all tanks are empty and segregated ballast tanks full for
normal ballast condition;
Tanks have to be filled to 98%; and
Shear forces and bending moments to be kept within limits; preliminary check can be
done by off-line Loadicator.
Student action:
Prepare cargo plan, Perform preliminary stress check with the Loadicator;
Tank filling to commence simultaneously or in order according to stress limitations;
Lining up and starting cooling plants on full load;
Checking parameters of cooling plant and determining whether the system is running
efficiently;
When loading tanks, levels to be monitored as well as tank atmosphere and shear
forces and bending moments;
Ballast to be pumped out in accordance with the loading sequence.
Debriefing:
Trainees should understand possibilities and limitations of a full cargo being loaded; and
Stability and stresses to be monitored and final draft, heel, tank ullages and temperature
/ pressures to be checked.
Evaluation:
By means of observation of final condition assessing, that all values of levels, volumes, trim
and list, shear forces and bending moments are within the determined limits.
EXERCISE NO. 3: DISCHARGING AND BALLASTING
Duration: 180 min (3 Hours)
Objectives:
By means of this exercise the relationship between the various sub-systems is supposed to be
demonstrated. The overall understanding of simultaneously discharging and ballasting to be
demonstrated and realized.
Prerequisites:
Theoretical knowledge of shear force, stress, trim, heel is required.
Simulator Condition:
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Briefing:
The trainees should be convinced of the complexity of the exercise, which should be
built up step by step;
Discharging to be started first;
Stress, trim and heel to be monitored;
Discharging and ballasting as per pre-prepared plan.
Student action:
Preparing a discharging plan, which will keep stress, trim and heel within the acceptable
limits;
Discharging, ballasting and stripping will take place simultaneously; and
In this order operations will continue until all cargo tanks are empty, and vessel
ballasted according to IMO requirements.
Debriefing:
By means of discussion bring up problems in operations and problems due to complexity.
Check which order tanks have been handled and in which order ballast has been loaded.
Evaluation:
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CASE STUDIES
Introduction
In this appendix, a few case studies on gas tanker accidents have been presented. The
objective is to sensitize the students regarding the huge fallout of accidents on board a tanker,
in terms of loss of life, property and coastal amenities, and subsequent expenditure of valuable
resources in terms of economic cost of a cleanup.
Working on board a gas tanker is very serious business that requires a high degree of
professionalism. Majority of incidents that take place on tankers, can be avoided by following
the basic rules of safety and ensuring that corners are not cut. It does not, pay to behave rashly
by doing so, the shipboard personnel, especially the senior management on board, behave in
an irresponsible manner. The point of continuous training is to make the student aware of the
meaning of responsibility. When the essence of being responsible for one's actions comes from
within, rather than being forced upon, it is the first step of safety culture on board.
Each case history is organized as follows:
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CASE STUDY - 1
Overfilling of Cargo Tanks
During the loading of a semipressurized LPG vessel of approximately 5000 cbm, a spill
occurred due to a cargo tank being over-filled under the following circumstances:
The vessel was lying head up at a river jetty with a 3 knot ebb current, wind blowing from bow
to stern.
The loading at the time of the incident was in the charge of the Chief Officer and the rate during
the previous hour had indicated that the tank would be in the fully loaded condition in some 2.5
hours time.
This particular vessel is fitted with a gas blower which produces a flash cooling effect in the
cargo tank by transferring large volumes of gas to the shore.
It was stated by the Chief Officer that he heard a sound from the blower, and while going to
investigate it, there was an eruption of liquid from the vent stack.
The action by the Officer was to stop the blower, close the filling valve to the tank in question
and advise verbally the jetty operator.
The emergency shutdown button was not pushed because of the automatic closing of the
vapour line with a corresponding surge in tank pressure.
During this period, liquid gas erupted from the vent stack with large drops and collected on the
vessel's main deck. The fire fighting hoses, at the ready during loading or unloading operations,
was used to flush the liquid gas overboard and cause more rapid evaporation.
It was noted that although the liquid had ceased to come out of the vent stack the tank safety
valve did not re-seat and a dense cloud of vapour was being exhausted.
A full-scale emergency procedure was initiated and a seawater hose was directed on the
safety valve in order to impart heat and hopefully free the seized spindle.
In view of the density of the gas around the vessel, a decision was made by the Master to close
down the auxiliary generating plant, i.e. shut down the entire ships machinery.
The crew with the exception of senior officers, were sent ashore. After a period of between one
to two hours the valves re-seated.
The jetty supervisor, after consultation with the Harbour Authority, had closed the river to all
traffic, and the adjacent traffic lanes were also closed.
Following exhaustive checks using portable explosion meters the Auxiliary plant was restarted
and the vessel completed the loading operation by using the gas blower to effect rapid
reduction in tank pressures by transferring vapours to shore.
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What would be your action in the event, of you having been the Chief Officer?
b)
Do you agree with the Master's action of shutting down the complete ships machinery?
Give reasons.
c)
The ship was in a foreign port, communications were difficult due to language problems.
What would you recommend should be done to overcome the problem?
d)
Ship personnel have no control over shore pumps or loading Rate, i.e. rapid 'increase in
rate would nullify the Chief Officer's estimate as to the completion of cargo. Should we
use an ESD or an umbilical cord system?
e)
Make general comments on the incident covering the role of jetty personnel and
relationship between ship and shore.
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CASE STUDY - 2
Explosion and Fire on Deck
A vessel was loading propane in still weather at a sheltered jetty. The final tank was being
completed but due to failure by the officer concerned the tank was allowed to overfill, the safety
valve lifted and liquid started to erupt from the vent stack. The liquid and vapour escaping from
the vent stack rolled down the shipside and was ignited by an internal combustion engine
running on a craft moored alongside.
There has been more than one incident of this nature recorded where escaping vapour has
been drawn into the air inlet of a petrol or diesel engine resulting in the engine over speeding
due to the governor which, shuts down-and the fuel supply under normal circumstances having
no control over the gas air mixture being drawn in via the air manifold of the engine.
The engine in these circumstances increased speed and finally disintegrated. The vapour in the
surrounding atmosphere was ignited and flashed back to the outlet of the vent stack which was,
fitted with a flame screen.
A fire at the top of the vent stack was being fed with vapour or possibly liquid droplets due to
over pressure in the cargo tank.
Points for Discussion
a)
What action should be' taken? List points covering ship and shore.
b)
Comment on the incident. How could the effects of the Original mistake have been
made less serious.
c)
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Part E: Evaluation
The effectiveness of any evaluation depends to a great extent on the precision of the
description of what is to be evaluated. The detailed teaching syllabus is thus designed,
to assist the Instructors, with descriptive verbs, mostly taken from the widely used
Bloom's taxonomy.
Evaluation/Assessment is a way of finding out if learning has taken place. It enables the
assessor (Instructor), to ascertain if the learner has gained the required skills and
knowledge needed at a given point towards a course or qualification.
The purpose of evaluation/assessment is to:
Summative assessment
It is designed to measure trainee's achievement against defined objectives and targets. It may
take the form of an exam or an assignment and takes place at the end of a course.
Purpose of summative assessment
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To grade a trainee.
Assessment Planning
Assessment planning should be specific, measurable, achievable, realistic and time-bound
(SMART).
Some methods of assessment that could be used depending upon the course / qualification are
as follows and should all be adapted to suit individual needs.
Practical
Validity
The evaluation methods must be based on clearly defined objectives, and it must truly
represent what is meant to be assessed, for example only the relevant criteria and the syllabus
or course guide. There must be a reasonable balance between the subject topics involved and
also in the testing of trainees' KNOWLEDGE, UNDERSTANDING AND PROFICIENCY of the
concepts.
Reliability
Assessment should also be reliable (if the assessment was done again with a similar
group/learner, would you receive similar results). We may have to deliver the same subject to
different group of learners at different times. If other assessors are also assessing the same
course/qualification as us, we need to ensure we are all making the same decisions.
To be reliable an evaluation procedure should produce reasonably consistent results no matter
which set of papers or version of the test is used.
If the Instructors are going to assess their own trainees, they need to know what they are to
assess and then decide how to do this. The what will come from the standards/learning
outcomes of the course/qualification they are delivering. The how may already be decided for
them if it is an assignments, tests or examinations.
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The instructors need to consider the best way to assess the skills, knowledge and attitudes of
our learners, whether this will be formative and/or summative and how the assessment will be
valid and reliable.
All work assessed should be valid, authentic, current, sufficient and reliable; this is often know
as VACSR "valid assessments create standard results".
It is important to note that no single methods can satisfactorily measure knowledge and skill
over the entire spectrum of matters to be tested for the assessment of competence.
Care should therefore be taken to select the method most appropriate to the particular aspect
of competence to be tested, bearing in mind the need to frame questions which relate as
realistically as possible to the requirements of the officer's job at sea.
STCW Code 2010
The training and assessment of seafarers, as required under the Convention, are administered,
supervised and monitored in accordance with the provisions of section A I/6 of the STCW
Code.
Column 3 - Methods for demonstrating competence and Column 4 - Criteria for evaluating
competence in Table A-V/1-2-1 (Specification of minimum standard of competence in basic
training for liquefied gas tanker cargo operations) of STCW Code 2010, sets out the methods
and criteria for evaluation.
Instructors should refer to this table when designing the assessment.
Instructors should also refer to the guidance as given in Section B-V/1-2 STCW code
Evaluation of competence
17. The arrangements for evaluating competence should be designed to take account of
different methods of assessment which can provide different types of evidence about
candidates' competence, e.g.:
1.
2.
3.
4.
5.
18. One or more of the first four methods listed should almost invariably be used to provide
evidence of ability, in addition to appropriate questioning techniques to provide evidence of
supporting knowledge and understanding.
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Assessment is also covered in detail in another IMO Model Course, however to assist and aid
the Instructors, some extracts from the Model course is used to explain in depth.
Multiple choice questions
Marking or scoring is easier if multiple-choice test items are used but in some cases difficulties
may arise in creating plausible distracters.
Detailed sampling a allow immediate identification of errors of principle and those of a clerical
nature. It must be emphasized that this holds true, in general, only if the test item is based on a
single step in the overall calculation. Multiple-choice items involving more than one step may, in
some cases, have to be resorted to in order to allow the creation of a sufficient number of
plausible distracters, but care must be exercised to ensure that distracters are not plausible for
more than one reason if the nature of the error made (and hence the distracter chosen) is to
affect the scoring of the test item.
Compiling tests
Whilst each examining authority establishes its own rules, the length of time which can be
devoted to assessing the competence of candidates for certificates of competency is limited by
practical, economic and sociological restraints. Therefore a prime objective of those responsible
for the organization and administration of the examination system is to find the most efficient,
effective and economical method of assessing the competency of candidates. An examination
system should effectively test the breadth of a candidate's knowledge of the subject areas
pertinent to the tasks he is expected to undertake. It is not possible to examine candidates fully
in all areas, so in effect the examination samples a candidate's knowledge by covering as wide
a scope as is possible within the time constraints and testing his depth of knowledge in selected
areas.
The examination as a whole should assess each candidate comprehension of principles,
concepts and methodology; his ability to apply principles, concepts and methodology; his ability
to organize facts, ideas and arguments and his abilities and skills in carrying out those tasks he
will be called upon to perform in the duties he is to be certificated to undertake.
All evaluation and testing techniques have their advantages and disadvantages. An examining
authority should carefully analyse precisely what it should be testing and can test. A careful
selection of test and evaluation methods should then be made to ensure that the best of the
variety of techniques available today is used. Each test shall be that best suited to the learning
outcome or ability to be tested.
Quality of test items
No matter which type of test is used, it is essential that all questions or test items used should
be as brief as possible, since the time taken to read the questions themselves lengthens the
examination. Questions must also be clear and complete. To ensure this, it is necessary that
they be reviewed by a person other than the originator. No extraneous information should be
incorporated into questions; such inclusions can waste the time of the knowledgeable
candidates and tend to be regarded as 'trick questions'. In all cases, the questions should be
checked to ensure that they measure an objective which is essential to, the job concerned.
Advantages and disadvantages of oral and practical tests
It is generally considered advisable that candidates for certificates of competency should be
examined orally. Some aspects of competency can only be properly judged by having the
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candidate demonstrate his ability to perform specific tasks in a safe and efficient manner. The
safety of .the ship and the protection of the marine environment are heavily dependent on the
human element. The ability of candidates to react in an organized, systematic and prudent way
can be more easily and reliably judged through an oral/practical test incorporating the use of
models or simulators than by any other form of test.
One disadvantage of oral/practical tests is that they can be time-consuming. Each test may
take up about 1 to 2 hours if it is to comprehensively cover the topics concerned.
Equipment must also be available in accordance with the abilities that are to be tested. Some
items of equipment can economically be dedicated solely for use in examinations.
A sample format of both multiple choice question and assessing candidates in simulator
exercises are provided below for guidance sake only.
1.
2.
3.
To increase pressure
To increase flow
To increase NPSH
To decrease NPSH
6.
N2
2.C/H
3.IBC
4.NLS
5.
Propane
Butane
Methane
Ethane
4.
-0.5OC
-42OC
-48OC
-34OC
What is the minimum allowed oxygen content prior making an entry in enclosed space?
a)
b)
7% by volume
10%
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c)
d)
7.
What is the minimum oxygen content in tank for checking vapour with Combustible gas
indicator
a)
b)
c)
d)
8.
All types
Ball valves
Seat & Needle valves
Globe and butterfly
Materials used for thermal insulation should be tested for the following properties as
applicable, to ensure that they are adequate for the intended service:
a)
b)
c)
d)
10.
12-14%
8 10%
14 16%
5 7%
What type of valves are mostly utilized on cargo lines on Gas tankers:
a)
b)
c)
d)
9.
No requirements
21%
Cargoes transported ________ - 500C are cooled down by a cascade system where the
cargo condenser is cooled by a liquid refrigerant gas such as R22.
a)
b)
c)
d)
Below
Above
Equal to
None
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SIMULATOR ASSESSMENT
HUMAN FACTORS
Sr. No
1.
2.
3.
Leadership
Team Work
Communication Skills
OPERATIONAL SKILLS
4.
5.
Self
Appraisals
6.
7.
8.
9.
10.
REMARKS:
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Name
Rank
Company
Name
Rank
Company
Cert no:
Cert no:
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ANNEX SAMPLE
PARTICIPANTS HANDOUT
1.1
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Types of Gas Carriers
Gas carriers range in capacity from the small pressurized tankers of between 500 and 6,000
m3 for shipment of propane, butane and the chemical gases at ambient temperature up to
the fully insulated or refrigerated seagoing tankers of over 100,000 m3 capacity for the
transport of LNG and LPG. Between those two distinct types is a third tanker type semi
pressurized gas carrier. These very flexible tankers are able to carry many cargoes in a fully
refrigerated condition at atmospheric pressure or at temperatures corresponding to carriage
pressure of between five and nine bar.
A feature almost unique to the gas carrier is that the cargo is kept under positive pressure to
prevent air entering the cargo system. This means that only cargo liquid and cargo vapour
are present in the cargo tank and flammable atmospheres cannot develop.
Furthermore all gas carriers utilize closed cargo systems when loading or discharging, with
no venting of vapour being allowed to the atmosphere. In the LNG trade, provision is always
made for the use of a vapour return line between tanker and shore to pass vapour displaced
by the cargo transfer. In the LPG trade this is not always the case as, under normal
circumstances during loading, reliquefaction is used to retain vapour on board. By these
means cargo release to the atmosphere is virtually eliminated and the risk of vapour ignition
is minimized.
LPG ships
Fully refrigerated LPG Ships
These ships are designed to carry fully refrigerated cargoes at near atmospheric pressure at
temperatures down to -50o C. The cargoes include LPG, ammonia and, in most cases, some
of the chemical gases, butadiene, propylene and VCM. Ships of the fully refrigerated type
generally have capacities above 15,000m3, up to about 85-100,000m3. These ships are
normally equipped with between three and six cargo tanks, extending almost the full beam of
the ship. Double bottom tanks are fitted, together with topside or complete side ballast tanks.
Prismatic free-standing tanks (Type A) are the most common, being supported on wooden
chocks and keyed to the hull to permit expansion and contraction. This type of tank usually
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has an internal centreline bulkhead to improve stability and reduce sloshing. The secondary
barrier is normally provided by the use of special steels for all hull structure which may be
exposed to the cargo if a rupture of the primary barrier occurs. The hold is inerted when
flammable cargoes are carried or filled with dry air for non-flammable cargoes.
LEG ships
Ethylene Carriers
In appearance this type of ship is very similar to the semi-pressurised ship, and competes for
the same cargoes when the ethylene market is less profitable. The main difference is the
design temperature of -104C for the cargo containment system.
The sizes are typically between 2-12,000m3, and the cargo tanks are independent pressure
vessel Type C tanks made from nickel-steel or stainless steel. For the Type C tanks, no
secondary barrier is required. The ships are normally fitted with a double bottom. A cascade
type refrigeration plant is fitted, of sufficient capacity for reliquefaction of ethylene carried fully
refrigerated at -104 C, and the cargo tanks normally have a thicker insulation than on fully
refrigerated LPG ships. A few ethylene carriers of small size have been built with semimembrane tanks and secondary barrier.
LNG Ships
Methane / LNG Carriers
Methane/LNG is carried at atmospheric pressure at -163C in cargo tanks made from
aluminium, nickel-steel or stainless (austenitic) steel. Insulation is fitted and most LNG ships
are more correctly described as fully insulated since they usually have no reliquefaction
plant; boil-off gas is normally burnt in the main propulsion machinery. The ships are large,
mainly from 40,000 to 135,000m3, with four to six cargo tanks of Type A, B or membrane.
The space between the primary and secondary barriers is inerted. However, for Type B
systems with only a partial secondary barrier, the hold space is usually filled with dry air.
A full double bottom and side ballast tanks are fitted. The arrangement of primary and
secondary barriers varies widely from system to system.
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Chlorine Ships
Chlorine is a very toxic gas that can be produced by the dissolution of sodium chloride in
electrolysis. Because of the toxicity of Chlorine it is therefore transported in small quantities,
and must not be transported in a larger quantity than 1200m3. The gas carrier carrying
chlorine must be type 1G with independent type C tanks. That means the cargo tank must, at
the least, lie B/5 "Breadth/5" up to 11,5 meter from the ships side. To transport Chlorine, the
requirements of IMO IGC code, chapters 14, 17 and 19 must be fulfilled. Cooling of Chlorine
requires indirect cargo cooling plants. The difference of Chlorine and other gases transported
is that Chlorine is not flammable. Chlorine is utilised in producing chemicals and as bleaching
agent in the cellulose industry.
LEG / LPG / Chemical ships
Gas carriers that are allowed to transport ethylene oxide or propylene oxide must be
specially certified for this. Ethylene oxide and propylene oxide have a boiling point at
atmospheric pressure of respectively 11oC and 34oC and are therefore difficult to transport
on tankers without indirect cargo cooling plants. Ethylene oxide and propylene oxide cannot
be exposed to high temperature and can therefore not be compressed in a direct cargo
cooling plant. Ethylene oxide must be transported on gas tanker type 1G. Chemical gases
like propylene, butadiene and VCM are transported with medium-sized atmospheric pressure
tankers from 12000 m3 to 56000 m3. Semi-pressurised gas carriers are also used in
chemical gas trade and then in smaller quantity as from 2500 m3 to 15000 m3. Chemical
gases are transported all over the world, and especially to the Far East where there is a large
growth in the petro-chemical industry.
___________
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