ISO 12614-2:2014

INTERNATIONAL ISO
STANDARD 12614-2
First edition
2014-07-01
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 2014
© ISO 2014
All rights reserved. Unless otherwise specified, 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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2014 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General . 2
5 Hydrostatic strength . 2
6 Leakage. 2
7 Excess torque resistance . 3
8 Bending moment . 3
9 Continued operation. 4
9.1 General . 4
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 . 5
12 Electrical overvoltages . 6
13 Non-metallic material immersion
...................................................................................................................................................... 6
14 Vibration resistance . 6
15 Brass material compatibility . 6
Bibliography . 8
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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles
using gaseous fuels.
ISO 12614 consists of the following parts, under the general title Road vehicles — Liquefied natural gas
(LNG) fuel system components:
— Part 1: General requirements and definitions
— Part 2: Performance and general test methods
— Part 3: Check valve
— Part 4: Manual valve
— Part 5: Tank pressure gauge
— Part 6: Pressure regulator
— Part 7: Pressure relief valve
— Part 8: Excess flow valve
— Part 9: Gas-tight housing and ventilation hose
— Part 10: Rigid fuel line in stainless steel
— Part 11: Fittings
— Part 12: Rigid fuel line in copper and its alloys
— Part 13: Pressure control regulator
— Part 14: Differential pressure fuel content gauge
— Part 15: Capacitance fuel content gauge
iv © ISO 2014 – All rights reserved

— Part 16: Heat exchanger – vaporizer
— Part 17: Natural gas detector
— Part 18: Gas temperature sensor
INTERNATIONAL STANDARD ISO 12614-2:2014(E)
Road vehicles — Liquefied natural gas (LNG) fuel system
components —
Part 2:
Performance and general test methods
1 Scope
This part of ISO 12614 specifies general requirements and definitions of liquefied natural gas fuel
system components, intended for use on the types of motor vehicles as defined in ISO 3833. This part of
ISO 12614 is also applicable to other LNG-fueled motor vehicles (for example ships) as far as appropriate,
until any specific norm would be worked out for such a type of vehicle. It also provides general design
principles, and specifies requirements for instructions and marking.
This part of ISO 12614 is not applicable to the following:
a) fuel containers;
b) stationary gas engines;
c) container mounting hardware;
d) electronic fuel management;
e) refueling receptacles.
NOTE 1 It is recognized that miscellaneous components not specifically covered herein can be examined to
meet the criteria of this part of ISO 12614 and tested according to the appropriate functional tests.
NOTE 2 All references to pressure in this part of ISO 12614 are to be considered gauge pressures unless
otherwise specified.
NOTE 3 This part of ISO 12614 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, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 12614-1:2014, Road vehicles — Liquefied natural gas (LNG) fuel system components — Part 1: General
requirements and definitions
ISO 15500-2:2012, Road vehicles — Compressed natural gas (CNG) fuel system components — Part 2:
Performance and general test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions in ISO 12614-1 apply.
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 ISO 12614
and any other applicable tests specified in this part of ISO 12614. Because of the peculiarities of some
components, the list of tests described in this part of the ISO 12614 from Clause 5 to 15 is not exhaustive.
If additional tests are required, their requirements are provided in the respective part of ISO 12614.
4.3 Unless otherwise specified, all tests shall be conducted using dry air or nitrogen. 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 will be used, which will be specifically
mentioned at the respective parts of the norm.
4.4 It is recognized that new technology might not be covered in ISO 12614-3 and subsequent parts of
ISO 12614.
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 internal blocks shall be ensured in the open
position. The hydrostatic pressure specified for each component in ISO 12614 and subsequent parts
shall be applied with a test fluid to the inlet of the component for a period of at least 3 min.
Test samples shall not be used for any other testing.
6 Leakage
Prior to conditioning, the devices shall be purged with nitrogen and then sealed at 30 % of working
pressure using nitrogen, dry air, or natural gas.
All tests shall be conducted while the devices are continuously exposed to the specified test temperatures.
The device
...