Road vehicles -- Liquefied natural gas (LNG) fuel system components

This document specifies the performance and general test methods of liquefied natural gas fuel system components, intended for use on the types of motor vehicles as defined in ISO 3833. This document is also applicable to other LNG-fueled motor vehicles as far as appropriate, until any specific norm is worked out for such a type of vehicle. It also provides general design principles and specifies requirements for instructions and marking. This document is not applicable to the following: a) fuel containers; b) stationary gas engines; c) container mounting hardware; d) electronic fuel management; e) refuelling receptacles. It is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this document and tested according to the appropriate functional tests. All references to pressure in this document are to be considered gauge pressures unless otherwise specified. This document is based upon a working pressure for natural gas as fuel of 1,6 MPa (16 bar)1. Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25.  1 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

Véhicules routiers -- Équipements pour véhicules utilisant le gaz naturel liquéfié (GNL) comme combustible

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Published
Publication Date
03-Jun-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
29-Apr-2021
Completion Date
29-Apr-2021
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INTERNATIONAL ISO
STANDARD 12614-2
Second edition
2021-06
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 2:
Performance and general test
methods
Véhicules routiers — Équipements pour véhicules utilisant le gaz
naturel liquéfié (GNL) comme combustible —
Partie 2: Performances et méthodes d'essai générales
Reference number
ISO 12614-2:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 12614-2:2021(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 12614-2:2021(E)
Contents Page

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 General ............................................................................................................................................................................................................................ 2

5 Hydrostatic strength ......................................................................................................................................................................................... 2

6 Leakage........................................................................................................................................................................................................................... 2

6.1 General ........................................................................................................................................................................................................... 2

6.2 External leakage ..................................................................................................................................................................................... 3

6.3 Internal leakage ...................................................................................................................................................................................... 3

6.4 Test conditions ........................................................................................................................................................................................ 3

7 Excess torque resistance .............................................................................................................................................................................. 3

8 Bending moment .................................................................................................................................................................................................. 3

9 Continued operation......................................................................................................................................................................................... 5

9.1 General ........................................................................................................................................................................................................... 5

9.2 Components, which are intended to be used at temperatures less than −40 °C ............................ 5

9.3 Components, which are not intended to be used at temperatures less than −40 °C .................. 5

10 Corrosion resistance ......................................................................................................................................................................................... 5

11 Oxygen ageing .......................................................................................................................................................................................................... 6

12 Electrical overvoltages ................................................................................................................................................................................... 6

13 Non-metallic material immersion ...................................................................................................................................................... 6

14 Vibration resistance .......................................................................................................................................................................................... 6

15 Brass material compatibility ................................................................................................................................................................... 7

Bibliography ................................................................................................................................................................................................................................ 8

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 12614-2:2021(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 (see 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 (see 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 22, Road vehicles, Subcommittee SC 41,

Specific aspects of gaseous fuels.

This second edition cancels and replaces the first edition (ISO 12614-2:2014), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— editorial changes.
A list of all parts in the ISO 12614 series can be found on the ISO website.

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 ----------------------
INTERNATIONAL STANDARD ISO 12614-2:2021(E)
Road vehicles — Liquefied natural gas (LNG) fuel system
components —
Part 2:
Performance and general test methods
1 Scope

This document specifies the performance and general test methods of liquefied natural gas fuel system

components, intended for use on the types of motor vehicles as defined in ISO 3833. This document

is also applicable to other LNG-fueled motor vehicles as far as appropriate, until any specific norm

is worked out for such a type of vehicle. It also provides general design principles and specifies

requirements for instructions and marking.
This document is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management;
e) refuelling receptacles.

It is recognized that miscellaneous components not specifically covered herein can be examined to

meet the criteria of this document and tested according to the appropriate functional tests.

All references to pressure in this document are to be considered gauge pressures unless otherwise

specified.

This document is based upon a working pressure for natural gas as fuel of 1,6 MPa (16 bar) . Other

working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio).

For example, a 2 MPa (20 bar) working pressure system will require pressures to be multiplied by 1,25.

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.

ISO 188:2011, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 12614-1:2021, Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 1: General

requirements and definitions

ISO 12614 (all parts), Road vehicles — Liquefied natural gas (LNG) fuel system components

ISO 15500 (all parts), Road vehicles — Compressed natural gas (CNG) fuel system components

1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm .
© ISO 2021 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 12614-2:2021(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12614-1 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 https:// www .electropedia .org/
4 General

4.1 Unless stated otherwise, the tests specified herein shall be conducted at room temperature, i.e.

20 °C ± 5 °C.

4.2 Components shall comply with the tests outlined in ISO 12614-3 and subsequent parts of the

ISO 12614 series and any other applicable tests specified in this document. Because of the peculiarities

of some components, the list of tests described in this document from Clauses 5 to 15 is not exhaustive.

If additional tests are required, their requirements are provided in the respective part of the ISO 12614

series.

4.3 Unless otherwise specified, all tests shall be conducted using inert gas. Qualified personnel can also

test with natural gas providing that appropriate safety measures are fulfilled. The dewpoint of the test

gas at the test pressure shall be at the temperature which ensures no icing, hydrate, or liquid formation.

For testing at low temperatures, liquid nitrogen or LNG will be used, which will be specifically mentioned

at the respective parts of the norm.

Unless otherwise specified, all pressures shall have a maximum tolerance of ±5 %.

Unless otherwise specified, all temperatures shall have a maximum tolerance of ±5 %.

Unless otherwise specified, all dimensions shall have a maximum tolerance of ±5%.

5 Hydrostatic strength
A component shall not rupture when subjected to the following test method.
Outlet opening of the component sh
...

INTERNATIONAL ISO
STANDARD 12614-2
Second edition
Road vehicles — Liquefied natural gas
(LNG) fuel system components —
Part 2:
Performance and general test methods
Véhicules routiers — Équipements pour véhicules utilisant le gaz
naturel liquéfié (GNL) comme combustible —
Partie 2: Performances et méthodes d'essai générales
PROOF/ÉPREUVE
Reference number
ISO 12614-2:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 12614-2:2021(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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 12614-2:2021(E)
Contents Page

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

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

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

3 Terms and definitions ..................................................................................................................................................................................... 2

4 General ............................................................................................................................................................................................................................ 2

5 Hydrostatic strength ......................................................................................................................................................................................... 2

6 Leakage........................................................................................................................................................................................................................... 2

6.1 General ........................................................................................................................................................................................................... 2

6.2 External leakage ..................................................................................................................................................................................... 3

6.3 Internal leakage ...................................................................................................................................................................................... 3

6.4 Test conditions ........................................................................................................................................................................................ 3

7 Excess torque resistance .............................................................................................................................................................................. 3

8 Bending moment .................................................................................................................................................................................................. 3

9 Continued operation......................................................................................................................................................................................... 5

9.1 General ........................................................................................................................................................................................................... 5

9.2 Components, which are intended to be used at temperatures less than −40 °C ............................ 5

9.3 Components, which are not intended to be used at temperatures less than −40 °C .................. 5

10 Corrosion resistance ......................................................................................................................................................................................... 5

11 Oxygen ageing .......................................................................................................................................................................................................... 6

12 Electrical overvoltages ................................................................................................................................................................................... 6

13 Non-metallic material immersion ...................................................................................................................................................... 6

14 Vibration resistance .......................................................................................................................................................................................... 6

15 Brass material compatibility ................................................................................................................................................................... 7

Bibliography ................................................................................................................................................................................................................................ 8

© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 12614-2:2021(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 (see 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 (see 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 22, Road vehicles, Subcommittee SC 41,

Specific aspects of gaseous fuels.

This second edition cancels and replaces the first edition (ISO 12614-2:2014), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— editorial changes.
A list of all parts in the ISO 12614 series can be found on the ISO website.

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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 12614-2:2021(E)
Road vehicles — Liquefied natural gas (LNG) fuel system
components —
Part 2:
Performance and general test methods
1 Scope

This document specifies the performance and general test methods of liquefied natural gas fuel system

components, intended for use on the types of motor vehicles as defined in ISO 3833. This document

is also applicable to other LNG-fueled motor vehicles as far as appropriate, until any specific norm

is worked out for such a type of vehicle. It also provides general design principles and specifies

requirements for instructions and marking.
This document is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management;
e) refuelling receptacles.

It is recognized that miscellaneous components not specifically covered herein can be examined to

meet the criteria of this document and tested according to the appropriate functional tests.

All references to pressure in this document are to be considered gauge pressures unless otherwise

specified.

This document is based upon a working pressure for natural gas as fuel of 1,6 MPa (16 bar).

(1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm .) Other working pressures can be accommodated by

adjusting the pressure by the appropriate factor (ratio). For example, a 2 MPa (20 bar) working pressure

system will require pressures to be multiplied by 1,25.
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.

ISO 188:2011, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests

ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests

ISO 12614-1:2020, Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 1: General

requirements and definitions

ISO 12614 (all parts), Road vehicles — Liquefied natural gas (LNG) fuel system components

ISO 15500 (all parts), Road vehicles — Compressed natural gas (CNG) fuel system components

© ISO 2021 – All rights reserved PROOF/ÉPREUVE 1
---------------------- Page: 5 ----------------------
ISO 12614-2:2021(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 12614-1 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 https:// www .electropedia .org/
4 General

4.1 Unless stated otherwise, the tests specified herein shall be conducted at room temperature, i.e.

20 °C ± 5 °C.

4.2 Components shall comply with the tests outlined in ISO 12614-3 and subsequent parts

of the ISO 12614 series and any other applicable tests specified in this document. Because of the

peculiarities of some components, the list of tests described in this document from Clauses 5 to 15 is

not exhaustive. If additional tests are required, their requirements are provided in the respective part

of the ISO 12614 series.

4.3 Unless otherwise specified, all tests shall be conducted using inert gas. Qualified personnel can also

test with natural gas providing that appropriate safety measures are fulfilled. The dewpoint of the test

gas at the test pressure shall be at the temperature which ensures no icing, hydrate, or liquid formation.

For testing at low temperatures, liquid nitrogen or LNG will be used, which will be specifically mentioned

at the respective parts of the norm.

Unless otherwise specified, all pressures shall have a maximum tolerance of ±5 %.

Unless otherwise specified, all temperatures shall have a maximum tolerance of ±5 %.

Unless otherwise specified, all dimensions shall have a maximum tolerance of ±5%.

5 Hydrostatic strength
A component shall not rupture when subjected to the following test method.
Outlet opening of the component shall be plugged. Valves or i
...

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