1、BSI Standards PublicationBS ISO 15500-2:2016Road vehicles Compressednatural gas (CNG) fuel systemcomponentsPart 2: Performance and general testmethodsBS ISO 15500-2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 15500-2:2016.It supersedes BS ISO 15500-2:2
2、012 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee GSE/40, Gas supply equipment for natural gas vehicles.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all t
3、he necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016. Published by BSI StandardsLimited 2016ISBN 978 0 580 90989 4ICS 43.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standa
4、rd was published under the authority of theStandards Policy and Strategy Committee on 30 April 2016.Amendments issued since publicationDate Text affectedBS ISO 15500-2:2016 ISO 2016Road vehicles Compressed natural gas (CNG) fuel system components Part 2: Performance and general test methodsVhicules
5、routiers Composants des systmes de combustible gaz naturel comprim (GNC) Partie 2: Performances et mthodes dessai gnralesINTERNATIONAL STANDARDISO15500-2Third edition2016-05-01Reference numberISO 15500-2:2016(E)BS ISO 15500-2:2016ISO 15500-2:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED
6、DOCUMENT ISO 2016, Published in SwitzerlandAll 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 writ
7、ten permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 15500-2:20
8、16ISO 15500-2:2016(E)Foreword ivIntroduction vi1 Scope . 12 Normative references 13 Terms and definitions . 14 General 15 Hydrostatic strength . 26 Leakage. 26.1 General . 26.2 External leakage . 26.3 Internal leakage 36.4 Test conditions 37 Excess torque resistance 38 Bending moment 49 Continued op
9、eration. 59.1 General . 59.2 Test methods . 59.2.1 Test procedure . 59.2.2 Room temperature cycling 69.2.3 High-temperature cycling 69.2.4 Low-temperature cycling . 610 Corrosion resistance . 611 Oxygen ageing 612 Electrical over-voltages . 713 Non-metallic material immersion 714 Vibration resistanc
10、e 815 Brass material compatibility . 816 Ozone ageing for vulcanized or thermoplastic rubbers 817 Resistance to dry heat for vulcanized or thermoplastic rubbers 918 Automotive fluid exposure . 918.1 General . 918.2 Test Method . 918.3 Fluids . 918.4 Pass criteria . 9Bibliography .10 ISO 2016 All rig
11、hts reserved iiiContents PageBS ISO 15500-2:2016ISO 15500-2:2016(E)ForewordISO (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
12、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
13、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
14、 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.
15、 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 do
16、cument 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 ISOs adherence to the World Trade Organization (WTO) principles in th
17、e Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 41, Specific aspects for gaseous fuels.This third edition cancels and replaces the second edition (ISO 15500-2:2012), whic
18、h has been technically revised.ISO 15500 consists of the following parts, under the general title Road vehicles Compressed natural gas (CNG) 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
19、 5: Manual cylinder valve Part 6: Automatic valve Part 7: Gas injector Part 8: Pressure indicator Part 9: Pressure regulator Part 10: Gas-flow adjuster Part 11: Gas/air mixer Part 12: Pressure relief valve (PRV) Part 13: Pressure relief device (PRD)iv ISO 2016 All rights reservedBS ISO 15500-2:2016I
20、SO 15500-2:2016(E) Part 14: Excess flow valve Part 15: Gas-tight housing and ventilation hose Part 16: Rigid fuel line in stainless steel Part 17: Flexible fuel line Part 18: Filter Part 19: Fittings Part 20: Rigid fuel line in material other than stainless steel ISO 2016 All rights reserved vBS ISO
21、 15500-2:2016ISO 15500-2:2016(E)IntroductionFor the purposes of this part of ISO 15500, all fuel system components in contact with natural gas have been considered suitable for natural gas as defined in ISO 15403 (all parts). However, it is recognized that miscellaneous components not specifically c
22、overed herein can be examined to meet the criteria of this part of ISO 15500 and can be tested in accordance with the appropriate functional tests.All references to pressure in this part of ISO 15500 are considered to be gauge pressures unless otherwise specified.This part of ISO 15500 is based on a
23、 service pressure for natural gas used as fuel of 20 MPa (200 bar1), settled at 15 C. Other service pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, a 25 MPa (250 bar) service pressure system will require pressures to be multiplied by 1,25.1) 1
24、bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2.vi ISO 2016 All rights reservedBS ISO 15500-2:2016INTERNATIONAL STANDARD ISO 15500-2:2016(E)Road vehicles Compressed natural gas (CNG) fuel system components Part 2: Performance and general test methods1 ScopeThis part of ISO 15500 specifies performance and gen
25、eral test methods for compressed natural gas (CNG) fuel system components intended for use on the types of motor vehicles defined in ISO 3833.This part of ISO 15500 is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using compressed natural gas in accordance with ISO 15403 (all
26、 parts). It is not applicable to the following:a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer;b) fuel containers;c) stationary gas engines;d) container-mounting hardware;e) electronic fuel management;f) refuelling receptacles.2 Normative refer
27、encesThe 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
28、 188, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance testsISO 1431-1, Rubber, vulcanized or thermoplastic Resistance to ozone cracking Part 1: Static and dynamic strain testingISO 1817, Rubber, vulcanized or thermoplastic Determination of the effect of liquidsISO 9227, Co
29、rrosion tests in artificial atmospheres Salt spray testsISO 15500-1:2015, Road vehicles Compressed natural gas (CNG) fuel system components Part 1: General requirements and definitions3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 15500-1 apply.4 Gen
30、eral4.1 Unless otherwise stated, the tests shall be conducted at a room temperature of 20 C 5 C. ISO 2016 All rights reserved 1BS ISO 15500-2:2016ISO 15500-2:2016(E)4.2 Components shall comply with the tests specified in this part of ISO 15500 as well as the relevant parts of ISO 15500, as applicabl
31、e for each component.NOTE Because of the peculiarities of some components, the list of tests given in this part of ISO 15500, (Clauses 5 to 15) is not exhaustive. Where additional tests are required, their provisions are given in other parts of ISO 15500.4.3 Unless otherwise specified, all tests sha
32、ll be conducted using dry air or nitrogen. Tests may also be conducted with natural gas provided appropriate safety measures are taken. The dew point of the test gas at the test pressure shall be at the temperature at which there is no icing, or hydrate or liquid formation.Unless otherwise specified
33、, 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 strengthA component shall not show any visible evidence of rupture w
34、hen subjected to the following test procedure.Plug the outlet opening of the component and have the valve seats or internal blocks assume the open position. Apply, with a test fluid, the hydrostatic pressure specified in the applicable part of ISO 15500 to the inlet of the component for a period of
35、at least 3 min.The hydrostatic pressure shall then be increased at a rate of less than or equal to 1,4 MPa/s until component failure. The hydrostatic pressure at failure shall be recorded. The failure pressure of previously tested components shall be no less than 80 % of the failure pressure of the
36、virgin component.The samples used in this test shall not be used for any other testing.6 Leakage6.1 General6.1.1 Prior to conditioning, purge the component with nitrogen, then seal it at 30 % of the working pressure using nitrogen, dry air or natural gas.6.1.2 Conduct all tests while the device is c
37、ontinuously exposed to the specified test temperatures. The device shall either be bubble-free or display a leakage rate of less than 20 Ncm3/h when subjected to the following test method.If components are subjected to more than one working pressure, the test may be conducted in subsequent steps.6.2
38、 External leakage6.2.1 Plug each device outlet into the appropriate mating connection.6.2.2 Apply pressurized air, nitrogen or natural gas to the inlet of the test device.6.2.3 At all test temperatures, immerse the components in a suitable test medium for 2 min +300s or use a helium vacuum test (glo
39、bal accumulation method) or other equivalent method.2 ISO 2016 All rights reservedBS ISO 15500-2:2016ISO 15500-2:2016(E)6.2.4 If there are no bubbles for the specified time period, the sample passes the test. If bubbles are detected, measure the leakage rate using an appropriate method; the leakage
40、rate should not be more than that specified in 6.1.2.6.3 Internal leakage6.3.1 The internal leakage test is applicable only to devices in the closed position. The aim of this test is to check the pressure tightness of the closed system.6.3.2 Connect the inlet or outlet (as applicable) of the device
41、to the appropriate mating connection, leaving the opposite connection(s) open.6.3.3 Apply the test pressure to the inlet or outlet (as applicable) of the device using air, nitrogen or natural gas as the test fluid.6.3.4 At all applicable test temperatures mentioned in 6.4, immerse the component in a
42、 suitable test medium for 2 min +300s or used any other equivalent method.6.3.5 If there are no bubbles for the specified time period, the sample passes the test. If bubbles are detected, measure the leakage rate using an appropriate method; the leakage rate should not be more than that specified in
43、 6.1.2.6.4 Test conditions6.4.1 The device shall be conditioned at a low temperature of 40 C (+0 C 5 C) or 20 C (+0 C 5 C), as applicable, and pressurized at 75 % and 2,5 % of the working pressure.6.4.2 The device shall be conditioned at a room temperature and pressurized at 2,5 % and 150 % of the w
44、orking pressure.6.4.3 The device shall be conditioned at a high temperature of 85 C (0 C +5 C) or 120 C (0 C +5 C), as applicable, and pressurized at 5 % and 150 % of the working pressure.7 Excess torque resistanceA component designed to be connected directly to threaded fittings shall be capable of
45、 withstanding, without deformation, breakage or leakage, a torque effort of at least 150 % of the rated installation value, when tested in accordance with the following test procedure.a) Test an unused component, applying the torque adjacent to the fitting.b) For a component having a threaded connec
46、tion or threaded connections, apply the turning effort for not less than 15 min, release it, then remove the component and examine it for deformation and breakage.c) Subject the component to the leakage test specified in Clause 6.d) Subject the component to the hydrostatic strength test specified in
47、 Clause 5. ISO 2016 All rights reserved 3BS ISO 15500-2:2016ISO 15500-2:2016(E)8 Bending momentA component shall be able to operate without cracking, breaking or leaking when tested in accordance with the following procedure.a) Assemble the connections of the component, ensuring that they are leak-t
48、ight, to one or several appropriate mating connection(s) representative of the design. After assembly, the length of the inlet tubing shall be greater than 300 mm (see Figure 1).b) The outlet connection shall be rigidly supported at a distance of 25 mm from the component outlet, except in the follow
49、ing cases: if the component has an integral mounting means that is independent of the inlet and outlet connections, the component shall be mounted using the integral mounting means specified by the manufacturer; if the component is intended to be mounted using either the integral mounting means or the component outlet, the mounting means that produces the most severe test condition shall be used.c) Check this assembly for leaks before subjecting it to step d).d) Wi
