ISO 16259:2025
(Main)Ships and marine technology — Performance test procedures of LNG BOG re-liquefaction system on board a ship
Ships and marine technology — Performance test procedures of LNG BOG re-liquefaction system on board a ship
This document specifies requirements and procedures for the performance test to verify the mechanical features of the liquified natural gas (LNG) boil-off gas (BOG) re-liquefaction system on board a ship. These test procedures can be prepared for LNG BOG re-liquefaction systems of LNG ships such as LNG carriers, LNG bunkering vessels and LNG fuelled vessels. Functions which are specific to manufacturers and any additional tests or specifications required by clients are not covered in this document.
Navires et technologie maritime — Modes opératoires d'essais de performance d'un système de re-liquéfaction BOG GNL à bord d'un navire
General Information
Buy Standard
Standards Content (Sample)
International
Standard
ISO 16259
First edition
Ships and marine technology —
2025-09
Performance test procedures of
LNG BOG re-liquefaction system on
board a ship
Navires et technologie maritime — Modes opératoires d'essais
de performance d'un système de re-liquéfaction BOG GNL à bord
d'un navire
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Inspection and tests . 2
5.1 General .2
5.2 Test fluid .3
5.3 Design appraisal .3
5.4 Equipment safety function testing .3
5.5 Hydrostatic test .3
5.6 Instrument signal inspection .4
5.7 Cryogenic function test .4
5.8 Emergency shutdown test .4
5.9 Performance test at cryogenic condition .5
5.10 Visual inspection .5
6 Marking . . 5
7 Test reports . 6
Annex A (informative) Inspection and test procedure . 7
Annex B (informative) Example of document lists applicable to design appraisal .11
Annex C (informative) Examples of test report forms .12
Annex D (informative) Example of concept model for LNG re-liquefaction system . 17
Annex E (informative) Components of natural gas . 19
Bibliography .20
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 25, Maritime GHG reduction.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
Introduction
The shipbuilding and marine industries have shown growing interest in the use of liquified natural gas (LNG)
to meet the increasingly strict international, regional and national regulations on gas emissions which are
harmful to the environment. One of the most important pieces of equipment used in the LNG vessel system
is the LNG boil-off gas (BOG) re-liquefaction system, since it can change natural gas to liquefied natural gas.
This allows the LNG ship to decrease fuel consumption and contribute to marine environmental protection.
The LNG fuelled vessel or bunkering vessel is expected to be designed and manufactured according to
[1] [2]
the requirements of internationally recognized standards such as IMO IGF and IGC Codes. However,
an internationally recognized standard on the performance testing of LNG BOG re-liquefaction systems
on board a ship has not yet been established. As the LNG BOG re-liquefaction system is tested according
to a case-by-case agreement between the owner and manufacturer, such an internationally recognized
standard would enable a test method which is commonly accepted by all stakeholders (e.g. ship owners,
classification societies, equipment manufactures and shipyards). For this reason, it is important to have an
objective document to test the performance of the LNG BOG re-liquefaction system on board a ship, which is
commonly acceptable to all stakeholders (e.g. ship owners, classification societies, equipment manufacturers
and shipyards).
In this regard, this document is designed to set a test procedure to evaluate the performance of the LNG BOG
re-liquefaction system on board a ship. This document aims to:
a) enable the performance of LNG BOG re-liquefaction system to be identified from an objective point of view;
b) provide useful requirements and guidelines to all stakeholders;
c) facilitate the development of more reliable LNG BOG re-liquefaction systems, with a view to contributing
to the growth of relevant industries and benefitting all stakeholders.
This document is intended to be applied in various situations, including factory acceptance tests or onboard
tests. The LNG BOG re-liquefaction system provider and ship owner are expected to agree on any additional
requirements that apply beyond the test requirements outlined in this document.
NOTE Relevant IACS requirements and legal requirements can apply.
v
International Standard ISO 16259:2025(en)
Ships and marine technology — Performance test procedures
of LNG BOG re-liquefaction system on board a ship
1 Scope
This document specifies requirements and procedures for the performance test to verify the mechanical
features of the liquified natural gas (LNG) boil-off gas (BOG) re-liquefaction system on board a ship. These
test procedures can be prepared for LNG BOG re-liquefaction systems of LNG ships such as LNG carriers,
LNG bunkering vessels and LNG fuelled vessels. Functions which are specific to manufacturers and any
additional tests or specifications required by clients are not covered in this document.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
design pressure
pressure at which each component of a piping system is designed to operate
Note 1 to entry: The design pressure must not be less than the pressure at the most severe condition of coincidental
internal or external pressure and temperature (maximum or minimum) expected during service.
3.2
design temperature
maximum temperature at which each component is designed to operate
Note 1 to entry: The design temperature must not be less than the temperature of the component material at the most
severe condition of temperature and coincidental pressure expected during service.
3.3
minimum working temperature
lowest temperature at which each equipment is designed to operate
3.4
maximum allowable working pressure
MAWP
maximum pressure of a piping system determined, in general, by the design pressure (3.1) of the weakest
piping component in the system or by the relief valve setting
Note 1 to entry: The MAWP shall not exceed the design pressure of a piping system.
3.5
liquefied natural gas
LNG
natural gas that has been cooled at atmospheric pressure to very low temperatures and condensed into
liquid form
Note 1 to entry: It is characterized as a cryogenic liquid having a temperature typically around –162 °C under normal
atmospheric pressure.
[SOURCE: ISO 20519:2021, 3.12, modified — "at atmospheric pressure to very low temperatures" has been
added to the definition; "–161 °C" has been changed to "–162 °C" in the note to entry.]
3.6
liquefaction
transformation of a gas into a liquid
3.7
boil-off gas
BOG
evaporation of liquefied natural gas (LNG) (3.5)
Note 1 to entry: Although the tanks are insulated, a small amount of warming occurs, causing the LNG cargo to
evaporate as it reaches its boiling point. This natural evaporation, known as boil-off, is unavoidable and the generated
boil-off gas (BOG) must be removed to preserve the tank pressure.
3.8
re-liquefaction system
system that consists of joule-thomson valve, separator, re-condensor, compressor, etc. for the purpose of
liquefying boil-off gas (BOG) (3.7)
Note 1 to entry: During liquid natural gas (LNG) (3.5) filling in a cargo tank and under navigation conditi
...
FINAL DRAFT
International
Standard
ISO/FDIS 16259
ISO/TC 8/SC 25
Ships and marine technology —
Secretariat: ANSI
Performance test procedures of
Voting begins on:
LNG BOG re-liquefaction system on
2025-06-10
board a ship
Voting terminates on:
2025-08-05
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/FDIS 16259:2025(en) © ISO 2025
FINAL DRAFT
ISO/FDIS 16259:2025(en)
International
Standard
ISO/FDIS 16259
ISO/TC 8/SC 25
Ships and marine technology —
Secretariat: ANSI
Performance test procedures of
Voting begins on:
LNG BOG re-liquefaction system on
board a ship
Voting terminates on:
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/FDIS 16259:2025(en) © ISO 2025
ii
ISO/FDIS 16259:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Inspection and tests . 2
5.1 General .2
5.2 Test fluid .3
5.3 Design appraisal .3
5.4 Equipment safety function testing .3
5.5 Hydrostatic test .3
5.6 Instrument signal inspection .4
5.7 Cryogenic function test .4
5.8 Emergency shutdown test .4
5.9 Performance test at cryogenic condition .5
5.10 Visual inspection .5
6 Marking . . 5
7 Test reports . 6
Annex A (informative) Inspection and test procedure . 7
Annex B (informative) Example of document lists applicable to design appraisal .11
Annex C (informative) Examples of test report forms .12
Annex D (informative) Example of concept model for LNG re-liquefaction system . 17
Annex E (informative) Components of natural gas . 19
Bibliography .20
iii
ISO/FDIS 16259:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee
SC 25, Maritime GHG reduction.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/FDIS 16259:2025(en)
Introduction
The shipbuilding and marine industries have shown growing interest in the use of liquified natural gas (LNG)
to meet the increasingly strict international, regional and national regulations on gas emissions which are
harmful to the environment. One of the most important pieces of equipment used in the LNG vessel system
is the LNG boil-off gas (BOG) re-liquefaction system, since it can change natural gas to liquefied natural gas.
This allows the LNG ship to decrease fuel consumption and contribute to marine environmental protection.
The LNG fuelled vessel or bunkering vessel is expected to be designed and manufactured according to
[1] [2]
the requirements of internationally recognized standards such as IMO IGF and IGC Codes. However,
an internationally recognized standard on the performance testing of LNG BOG re-liquefaction systems
on board a ship has not yet been established. As the LNG BOG re-liquefaction system is tested according
to a case-by-case agreement between the owner and manufacturer, such an internationally recognized
standard would enable a test method which is commonly accepted by all stakeholders (e.g. ship owners,
classification societies, equipment manufactures and shipyards). For this reason, it is important to have an
objective document to test the performance of the LNG BOG re-liquefaction system on board a ship, which is
commonly acceptable to all stakeholders (e.g. ship owners, classification societies, equipment manufacture
and shipyards).
In this regard, this document is designed to set a test procedure to evaluate the performance of the LNG BOG
re-liquefaction system on board a ship. This document aims to:
a) enable the performance of LNG BOG re-liquefaction system to be identified from an objective point of view;
b) provide useful requirements and guidelines to all stakeholders;
c) facilitate the development of more reliable LNG BOG re-liquefaction systems, with a view to contributing
to the growth of relevant industries and benefitting all stakeholders.
This document is intended to be applied in various situations, including factory acceptance tests or onboard
tests. The LNG BOG re-liquefaction system provider and ship owner are expected to agree on any additional
requirements that apply beyond the test requirements outlined in this document.
NOTE Relevant IACS requirements and legal requirements can apply.
v
FINAL DRAFT International Standard ISO/FDIS 16259:2025(en)
Ships and marine technology — Performance test procedures
of LNG BOG re-liquefaction system on board a ship
1 Scope
This document specifies requirements and procedures for the performance test to verify the mechanical
features of the liquified natural gas (LNG) boil-off gas (BOG) re-liquefaction system on board a ship. These
test procedures can be prepared for LNG BOG re-liquefaction systems of LNG ships such as LNG carriers,
LNG bunkering vessels and LNG fuelled vessels. Functions which are specific to manufacturers and any
additional tests or specifications required by clients are not covered in this document.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
design pressure
pressure at which each component of a piping system is designed to operate
Note 1 to entry: The design pressure must not be less than the pressure at the most severe condition of coincidental
internal or external pressure and temperature (maximum or minimum) expected during service.
3.2
design temperature
maximum temperature at which each component is designed to operate
Note 1 to entry: The design temperature must not be less than the temperature of the component material at the most
severe condition of temperature and coincidental pressure expected during service.
3.3
minimum working temperature
lowest temperature at which each equipment is designed to operate
3.4
maximum allowable working pressure
MAWP
maximum pressure of a piping system determined, in general, by the design pressure (3.1) of the weakest
piping component in the system or by the relief valve setting
Note 1 to entry: The MAWP shall not exceed the design pressure of a piping system.
-----
...
Style Definition
ISO/DIS FDIS 16259:2024(en) .
Formatted: zzCover large
ISO /TC 8/WG SC 25
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Date: 2024-08-232025-05-27
Formatted: Cover Title_A1
Ships and marine technology — — Performance test procedures of
LNG BOG re-liquefaction system on board a ship
FDIS stage
ISO /FDIS 16259(E:2025(en)
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spacing: single
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All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this
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including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can
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be requested from either ISO at the address below or ISO’s member body in the country of the requester.
Asian text and numbers
ISO copyright office
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CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Formatted: French (Switzerland)
EmailE-mail: copyright@iso.org
Formatted: French (Switzerland)
Website: www.iso.orgwww.iso.org
Formatted: French (Switzerland)
Published in Switzerland
Formatted: Font: 10 pt
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pt, Line spacing: single
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ii © ISO16259 © ISO 2025 – All rights reserved
ii
ISO/DIS FDIS 16259:20242025(en)
Formatted: Font: Bold, English (United Kingdom)
Formatted: HeaderCentered, Left, Space After: 0 pt,
Line spacing: single
Contents
Formatted: Font: Bold, English (United Kingdom)
Formatted: Font: Bold, English (United Kingdom)
Foreword . v
Formatted: Font: 11 pt, Bold
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Inspection and tests . 3
6 Marking . 6
7 Test reports . 6
Annex A (informative) Inspection and test procedure . 8
Annex B (informative) Example of document lists applicable to design appraisal . 12
Annex C (informative) Examples of test report forms . 13
Annex D (informative) Example of concept model for LNG re-liquefaction system . 20
Annex E (informative) Components of natural gas. 24
Bibliography . 25
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 3
5 Inspection and tests . 4
5.1 General . 4
5.2 Test fluid . 4
5.3 Design appraisal. 4
5.4 Equipment safety function test at ambient test / cryogenic condition . 4
5.5 Hydrostatic test . 4
5.6 Instrument signal inspection . 5
5.7 Cryogenic function test . 5
5.8 Emergency shut down test . 5
5.9 Performance test at cryogenic condition . 6
5.10 Visual inspection . 7
6 Marking . 7
7 Test report . 7
Formatted: Font: 10 pt
Annex A (informative) Inspection and test procedure . 8
Formatted: Font: 10 pt
Annex B (informative) Example of document lists applicable to design appraisal . 11
Formatted: FooterCentered, Left, Line spacing: single
Annex C (informative) Example of test report form. 12
Formatted: Font: 11 pt
Annex D (informative) Examples of concept model for LNG Re-Liquefaction system . 19
Formatted: FooterPageRomanNumber, Left, Space
Annex E (informative) Characteristic of natural gas . 22 After: 0 pt, Line spacing: single
iii
ISO /FDIS 16259(E:2025(en)
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Formatted: Font: 11 pt, Bold
Formatted: HeaderCentered, Space After: 0 pt, Line
Bibliography .23
spacing: single
Formatted: Font: 11 pt, Bold
Formatted: Font: 10 pt
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pt, Line spacing: single
Formatted: Font: 11 pt
iv © ISO16259 © ISO 2025 – All rights reserved
iv
ISO/DIS FDIS 16259:20242025(en)
Formatted: Font: Bold, English (United Kingdom)
Formatted: Font: Bold, English (United Kingdom)
Formatted: Font: Bold, English (United Kingdom)
Foreword
Formatted: HeaderCentered, Left, Space After: 0 pt,
Line spacing: single
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out Formatted: Font: 11 pt, Bold
through ISO technical committees. Each member body interested in a subject for which a technical
Formatted: Adjust space between Latin and Asian text,
committee has been established has the right to be represented on that committee. International
Adjust space between Asian text and numbers
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO
collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Formatted: English (United Kingdom)
ISO draws attention to the possibility that the implementation of this document may involve the use of
(a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice
Formatted: Font color: Auto
of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for
identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
Formatted: English (United Kingdom)
This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 25, Maritime GHG reduction.
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: English (United Kingdom)
complete listing of these bodies can be found at
www.iso.org/members.htmlwww.iso.org/members.html.
Formatted: English (United Kingdom)
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: FooterCentered, Left, Line spacing: single
Formatted: Font: 11 pt
Formatted: FooterPageRomanNumber, Left, Space
After: 0 pt, Line spacing: single
v
ISO /FDIS 16259(E:2025(en)
Formatted: Font: 11 pt, Bold
Formatted: HeaderCentered, Space After: 0 pt, Line
spacing: single
Introduction Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
The shipbuilding and marine industries have shown growing interest in the use of liquified natural gas
(LNG) to meet the increasingly strict international, regional and national regulations on gas emissions
which are harmful to the environment. One of the most important pieces of equipment used in the LNG
vessel system is the LNG boil-off gas (BOG) re-liquefaction system, since it can change natural gas to
liquefied natural gas. This allows the LNG ship to decrease fuel consumption and contribute to marine
environmental protection.
The LNG fuelled vessel or bunkering vessel is expected to be designed and manufactured according to the
[1] [2]
requirements of internationalinternationally recognized standards such as IMO IGF and IGC Codes .
However, an internationally recognized standard on the performance testing of LNG BOG re-liquefaction
systems on board a ship has not yet been established. As the LNG BOG re-liquefaction system is tested
according to a case-by-case agreement between the owner and manufacturer, such an internationally
recognized standard would enable a test method which is commonly accepted by all stakeholders (e.g.
ship owners, classification societies, equipment manufactures and shipyards etc.).). For this reason, it is
important to have an objective document to test the performance of the LNG BOG re-liquefaction system
on board a ship, which is commonly acceptable to all stakeholders. (e.g. ship owners, classification
societies, equipment manufacture and shipyards etc.)).
In this regard, this document is designed to set a test procedure to evaluate the performance of the LNG
Formatted: Adjust space between Latin and Asian text,
BOG re-liquefaction system on board a ship. This document aims to:
Adjust space between Asian text and numbers
a) i) enable the performance of LNG BOG re-liquefaction system to be identified from an objective point
Formatted: List Number 1, Numbered + Level: 1 +
of view;
Numbering Style: a, b, c, … + Start at: 1 + Alignment:
Left + Aligned at: 0 cm + Indent at: 0 cm, Adjust space
b) ii) provide useful requirements and guidelines to all stakeholders; between Latin and Asian text, Adjust space between
Asian text and numbers
c) iii) facilitate the development of more reliable LNG BOG re-liquefaction systems, with a view to
contributing to the growth of relevant industries and benefitting all stakeholders.
This document is intended to be applied in manyvarious situations, including factory acceptance tests or
Formatted: Adjust space betw
...
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