Ships and marine technology -- Performance test procedures for LNG fuel gas supply systems (FGSS) for ships

This document specifies evaluation methods of characteristics such as pressure, flow rate, temperature and system stability of fuel gas supply systems (FGSS), which are manufactured to use vaporized liquefied natural gas (LNG) or boil-off gas as fuel gas supply to the vessel's gas consumers. It is applicable to evaluate the performance of the LNG FGSS: (1) prior to delivery or after installation on board a ship, and (2) to assure the system characteristics are taken into account for the entire gas consumers during ship’s gas trial or sea trial.

Navires et technologie maritime -- Procédures d'essais de performance des systèmes d'alimentation en gaz combustible GNL (FGSS) pour navires

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Status
Published
Publication Date
01-Jun-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
30-Apr-2021
Completion Date
29-Apr-2021
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INTERNATIONAL ISO
STANDARD 22548
First edition
2021-06
Ships and marine technology —
Performance test procedures for LNG
fuel gas supply systems (FGSS) for
ships
Navires et technologie maritime — Procédures d'essais de
performance des systèmes d'alimentation en gaz combustible GNL
(FGSS) pour navires
Reference number
ISO 22548:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 22548:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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 © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 22548:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Test arrangement ................................................................................................................................................................................................. 2

4.1 Test preparation ..................................................................................................................................................................................... 2

4.2 Test fluid ....................................................................................................................................................................................................... 3

4.3 Test parameters ...................................................................................................................................................................................... 3

5 Test procedure ........................................................................................................................................................................................................ 4

5.1 Safety test .................................................................................................................................................................................................... 4

5.1.1 Test of e.g. alarm and safety devices ............................................................................................................... 4

5.1.2 Cryogenic function tests ............................................................................................................................................ 4

5.1.3 ESD and blow down test ........................................................................................................................................... . 4

5.2 Performance test ................................................................................................................................................................................... 4

6 Additional tests ...................................................................................................................................................................................................... 5

6.1 Unit production test............................................................................................................................................................................ 5

6.2 Type test ....................................................................................................................................................................................................... 6

6.3 Endurance test ........................................................................................................................................................................................ 6

7 Test report ................................................................................................................................................................................................................... 6

Annex A (informative) LNG fuel gas supply systems (FGSS) test report — Example ..........................................7

Annex B (informative) Typical examples of LNG FGSS within the scope of the test .............................................9

Bibliography .............................................................................................................................................................................................................................12

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 22548:2021(E)
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 documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www .iso .org/ directives

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received. www .iso .org/ patents

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.

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 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 22548:2021(E)
Introduction

In response to an increased number of ships using LNG fuel, the International Maritime Organization

(IMO) adopted the IGF code that specifies mandatory requirements of the LNG fuel tank, LNG fuel engine,

fuel gas supply system (FGSS), bunkering, control of safety system, monitoring, and fire extinguishing

systems, etc. to ensure the safety of gas-fuelled ships.

The requirements of the IGF and IGC Codes apply to the design and manufacture of LNG FGSS. However,

no widely recognized standards in terms of the performance testing of FGSS has yet been established;

thus, FGSS is tested according to a case-by-case agreement between the buyer and the supplier. For this

reason, there have been needs to develop a standard for performance test methods of FGSS commonly

acceptable to all stakeholders (e.g. shipowners, classification societies, engine makers, shipyards, etc.).

In this context, this document sets up a performance test procedure for the LNG FGSS, which consists

of equipment such as pumps, heat exchangers, valves, piping, etc. With this document, it is expected

that i) the performance of LNG FGSS be identified from an objective point of view, ii) useful information

be provided to all stakeholders, and iii) development of more reliable LNG FGSS be facilitated, thus

contributing to the growth of relevant industries and benefiting all stakeholders.

In addition, as specific requirements from classification societies and/or administrations can apply to

the LNG FGSS concerned, the buyer is expected to identify those before placing a purchase order. The

supplier and the buyer are further expected to agree on any additional applicable requirements.

© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 22548:2021(E)
Ships and marine technology — Performance test
procedures for LNG fuel gas supply systems (FGSS) for
ships
1 Scope

This document specifies evaluation methods of characteristics such as pressure, flow rate, temperature

and system stability of fuel gas supply systems (FGSS), which are manufactured to use vaporized

liquefied natural gas (LNG) or boil-off gas as fuel gas supply to the vessel's gas consumers. It is applicable

to evaluate the performance of the LNG FGSS: (1) prior to delivery or after installation on board a ship,

and (2) to assure the system characteristics are taken into account for the entire gas consumers during

ship’s gas trial or sea trial.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

IMO, International Code for the Construction and Equipment of Ships carrying Liquefied Gases in Bulk (IGC

Code)

IMO, International Code of Safety for Ships using Gases or other Low-flashpoint Fuels (IGF Code)

3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
LNG fuel gas supply system
LNG FGSS

system that supplies gas fuel at the temperature, pressure and flow conditions required by the gas

consumer, from the fuel tank(s) to the gas consumer, excluding the fuel tank(s), in-tank pump(s), tank

ESD valve(s) and the master gas fuel valve(s) used to control the gas supply
3.2
maximum pressure
maximum operating pressure (MPa) measured during the test period
3.3
minimum pressure
minimum operating pressure (MPa) measured during the test period
3.4
pressure pulsation

pressure variation (MPa) during the test period, defined as the difference between the maximum

pressure (3.2) and the minimum pressure (3.3)
© ISO 2021 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 22548:2021(E)
3.5
flow rate
arithmetic mean of the mass flow rate (kg/h) measured during the test period
3.6
average temperature
arithmetic mean of the temperature (°C) measured during the test period
3.7
test temperature
temperature (°C) of the fluid during the test, designated by the client
3.8
test pressure
pressure (MPa) of the fluid during the test, des
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 22548
ISO/TC 8
Ships and marine technology —
Secretariat: SAC
Performance test procedures for LNG
Voting begins on:
fuel gas supply systems (FGSS) for ships
2021­03­04
Voting terminates on:
Navires et technologie maritime — Procédures d'essais de
2021­04­29
performance des systèmes d'alimentation en gaz combustible GNL
(FGSS) pour navires
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
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 22548:2021(E)
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. ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 22548:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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
CH­1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 22548:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Test arrangement ................................................................................................................................................................................................. 2

4.1 Test preparation ..................................................................................................................................................................................... 2

4.2 Test fluid ....................................................................................................................................................................................................... 3

4.3 Test parameters ...................................................................................................................................................................................... 3

5 Test procedure ........................................................................................................................................................................................................ 4

5.1 Safety test .................................................................................................................................................................................................... 4

5.1.1 Test of e.g. alarm and safety devices ............................................................................................................... 4

5.1.2 Cryogenic function tests ............................................................................................................................................ 4

5.1.3 ESD and blow down test ........................................................................................................................................... . 4

5.2 Performance test ................................................................................................................................................................................... 4

6 Additional tests ...................................................................................................................................................................................................... 5

6.1 Unit production test............................................................................................................................................................................ 5

6.2 Type test ....................................................................................................................................................................................................... 6

6.3 Endurance test ........................................................................................................................................................................................ 6

7 Test report ................................................................................................................................................................................................................... 6

Annex A (informative) LNG fuel gas supply systems (FGSS) test report — Example ..........................................7

Annex B (informative) Typical examples of LNG FGSS within the scope of the test .............................................9

Bibliography .............................................................................................................................................................................................................................12

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 22548:2021(E)
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 non­governmental, 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 documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2. www .iso .org/ directives

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received. www .iso .org/ patents

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.

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 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 22548:2021(E)
Introduction

In response to an increased number of ships using LNG fuel, the International Maritime Organization

(IMO) adopted the IGF code that specifies mandatory requirements of the LNG fuel tank, LNG fuel engine,

fuel gas supply system (FGSS), bunkering, control of safety system, monitoring, and fire extinguishing

systems, etc. to ensure the safety of gas-fuelled ships.

The requirements of the IGF and IGC Codes apply to the design and manufacture of LNG FGSS. However,

no widely recognized standards in terms of the performance testing of FGSS has yet been established;

thus, FGSS is tested according to a case-by-case agreement between the buyer and the supplier. For this

reason, there have been needs to develop a standard for performance test methods of FGSS commonly

acceptable to all stakeholders (e.g. shipowners, classification societies, engine makers, shipyards, etc.).

In this context, this document sets up a performance test procedure for the LNG FGSS, which consists

of equipment such as pumps, heat exchangers, valves, piping, etc. With this document, it is expected

that i) the performance of LNG FGSS be identified from an objective point of view, ii) useful information

be provided to all stakeholders, and iii) development of more reliable LNG FGSS be facilitated, thus

contributing to the growth of relevant industries and benefiting all stakeholders.

In addition, as specific requirements from classification societies and/or administrations can apply to

the LNG FGSS concerned, the buyer is expected to identify those before placing a purchase order. The

supplier and the buyer are further expected to agree on any additional applicable requirements.

© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 22548:2021(E)
Ships and marine technology — Performance test
procedures for LNG fuel gas supply systems (FGSS) for ships
1 Scope

This document specifies evaluation methods of characteristics such as pressure, flow rate, temperature

and system stability of fuel gas supply systems (FGSS), which are manufactured to use vaporized

liquefied natural gas (LNG) or boil-off gas as fuel gas supply to the vessel's gas consumers. It is applicable

to evaluate the performance of the LNG FGSS: (1) prior to delivery or after installation on board a ship,

and (2) to assure the system characteristics are taken into account for the entire gas consumers during

ship’s gas trial or sea trial.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

IMO, International Code for the Construction and Equipment of Ships carrying Liquefied Gases in Bulk

(IGC Code)

IMO, International Code of Safety for Ships using Gases or other Low-flashpoint Fuels (IGF Code)

3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
LNG fuel gas supply system
LNG FGSS

system that supplies gas fuel at the temperature, pressure and flow conditions required by the gas

consumer, from the fuel tank(s) to the gas consumer, excluding the fuel tank(s), in-tank pump(s), tank

ESD valve(s) and the master gas fuel valve(s) used to control the gas supply
3.2
maximum pressure
maximum operating pressure (MPa) measured during the test period
3.3
minimum pressure
minimum operating pressure (MPa) measured during the test period
3.4
pressure pulsation

pressure variation (MPa) during the test period, defined as the difference between the maximum

pressure (3.2) and the minimum pressure (3.3)
© ISO 2021 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 22548:2021(E)
3.5
flow rate
arithmetic mean of the mass flow rate (kg/h) measured
...

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