1、BSI Standards PublicationBS ISO 15500-12:2015Road vehicles Compressednatural gas (CNG) fuel systemcomponentsPart 12: Pressure relief valve (PRV)BS ISO 15500-12:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO15500-12:2015.The UK participation in its prepara
2、tion 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 the necessaryprovisions of a contract. Users are responsibl
3、e for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 79971 6ICS 43.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Polic
4、y and Strategy Committee on 31 December 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 15500-12:2015 ISO 2015Road vehicles Compressed natural gas (CNG) fuel system components Part 12: Pressure relief valve (PRV)Vhicules routiers Composants des systmes de combus
5、tible gaz naturel comprim (GNC) Partie 12: Soupapes de scurit la pressionINTERNATIONAL STANDARDISO15500-12Second edition2015-12-01Reference numberISO 15500-12:2015(E)BS ISO 15500-12:2015ISO 15500-12:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in Switzerland
6、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
7、 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 15500-12:2015ISO 15500-12:2015(E)Foreword iv1 Scope .
8、 12 Normative references 13 Terms and definitions . 14 Marking 25 Construction and assembly . 26 Tests . 26.1 Applicability 26.2 Hydrostatic strength 36.3 Leakage 36.4 Continued operation 36.5 Operational test 36.5.1 General 36.5.2 Test procedure . 3Bibliography 5 ISO 2015 All rights reserved iiiCon
9、tents PageBS ISO 15500-12:2015ISO 15500-12:2015(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 committees. Each
10、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
11、 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 ty
12、pes 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 b
13、e 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 infor
14、mation 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 WTO principles in the Technical Barriers to Trade (TBT) see th
15、e following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 41, Specific aspects for gaseous fuels.This second edition cancels and replaces the first edition (ISO 15500-12:2001), which has been technically revised.ISO
16、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 5: Manual cylinder valve Part 6: A
17、utomatic 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 2015 All rights reservedBS ISO 15500-12:2015ISO 15500-12:2015(E) Part 14: Exces
18、s 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 2015 All rights reserved vBS ISO 15500-12:2015BS ISO 15500-12:201
19、5Road vehicles Compressed natural gas (CNG) fuel system components Part 12: Pressure relief valve (PRV)1 ScopeThis part of ISO 15500 specifies tests and requirements for the pressure relief valve (PRV), a compressed natural gas fuel system component intended for use on the types of motor vehicles de
20、fined in ISO 3833.This part of ISO 15500 is applicable to vehicles using natural gas in accordance with ISO 15403-1 (mono-fuel, bi-fuel, or dual-fuel applications). It is not applicable to the following:a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vap
21、orizer;b) fuel containers;c) stationary gas engines;d) container mounting hardware;e) electronic fuel management;f) refuelling 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 15500 and tested a
22、ccording to the appropriate functional tests.NOTE 2 All references to pressure in this part of ISO 15500 are to be considered gauge pressures unless otherwise specified.NOTE 3 This part of ISO 15500 is based upon a service pressure for natural gas as a fuel of 20 MPa 200 bar1) settled at 15 C. Other
23、 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 1,25.2 Normative referencesThe following documents, in whole or in part, are normatively referenced i
24、n 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 15500-1, Road vehicles Compressed natural gas (CNG) fuel system components Par
25、t 1: General requirements and definitionsISO 15500-2, Road vehicles Compressed natural gas (CNG) fuel system components Part 2: Performance and general test methods3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 15500-1 and the following apply.1) 1 ba
26、r = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2.INTERNATIONAL STANDARD ISO 15500-12:2015(E) ISO 2015 All rights reserved 1BS ISO 15500-12:2015ISO 15500-12:2015(E)3.1set pressurepressure at which it is intended that the PRV opens4 MarkingMarking of the component shall provide sufficient information to allow the
27、 following to be traced:a) the manufacturers or agents name, trademark or symbol;b) the model designation (part number);c) working pressure and temperature range.The following additional markings are recommended: the direction of flow (when necessary for correct installation); the type of fuel; elec
28、trical ratings (if applicable); the symbol of the certification agency; the type approval number; the serial number or date code; a reference to this part of ISO 15500.NOTE This information can be provided by a suitable identification code on at least one part of the component when it consists of mo
29、re than one part.5 Construction and assemblyThe PRV shall comply with the applicable provisions of ISO 15500-1 and ISO 15500-2 and with the tests specified in Clause 6. Tolerances should follow the specifications of ISO 15500-2.6 Tests6.1 ApplicabilityThe tests required to be carried out are indicat
30、ed in Table 1.Table 1 Tests applicableTest Applicable Test procedure as required by ISO 15500-2Specific test requirements of this part of ISO 15500Hydrostatic strength X X X (see 6.2)Leakage X X X (see 6.3)Excess torque resistance X XBending moment X XContinued operation X X X (see 6.4)Operational X
31、 X (see 6.5)Corrosion resistance X X2 ISO 2015 All rights reservedBS ISO 15500-12:2015ISO 15500-12:2015(E)Test Applicable Test procedure as required by ISO 15500-2Specific test requirements of this part of ISO 15500Oxygen ageing X XOzone ageing X XHeat ageing X XAutomotive fluids X XElectrical over-
32、voltagesNon-metallic material immersion X XVibration resistance X XBrass material compatibility X X6.2 Hydrostatic strengthTest the PRV according to the procedure for testing hydrostatic strength specified in ISO 15500-2 to at least 2,5 times its working pressure.For the purposes of this test, the P
33、RVs mechanism shall be removed and its orifice blocked.6.3 LeakageTest the PRV at 40 C or 20 C, room temperature and 85 C or 120 C (if required by the operating conditions), at working pressure.6.4 Continued operationThe PRV shall be capable of withstanding 600 cycles of operation when tested accord
34、ing to the provisions of the continued operation test procedure given in ISO 15500-2 and the following.a) A test cycle consists of, first, pressurizing the PRV to the set pressure. This action shall cause the PRV to open and vent. Once the valve is venting, reduce the inlet pressure; when the PRV re
35、-seats, the cycle is finished.b) After 600 cycles, test the PRV for leakage at 20 C 5 C at its working pressure. Cycle time shall be within a period of 10 s 2 s.6.5 Operational test6.5.1 GeneralVerify the opening and re-seating pressures of the PRV. The opening pressure shall be equal to the set pre
36、ssure 5 % at 20 C, 40 C or 20 C (as applicable) and 85 C or 120 C (as required by the operating conditions).6.5.2 Test procedureThree randomly selected samples shall be subjected to the following test procedure. This test has three steps, which shall be conducted in the order given. Appropriate test
37、 media shall be chosen (i.e. air, nitrogen, or natural gas). If the test medium is not natural gas, then the calculated flow values shall be corrected for natural gas.a) Establish the opening and re-seating values for the samples at 20 C 2 C. Do this by first slowly pressurizing the inlet of the sam
38、ple to 110 % of the set pressure, noting the value at which it first opens.Table 1 (continued) ISO 2015 All rights reserved 3BS ISO 15500-12:2015ISO 15500-12:2015(E)b) Lower the inlet pressure until the PRV re-seats; note that value. The valves are considered to have passed if all the following requ
39、irements are met:1) opening pressures shall be 5 % of the manufacturers set pressure;2) re-seating pressures shall be no less than 90 % of the set pressure;3) all re-seating pressures shall be within 5 % of the average re-seating pressure.c) Repeat a) and b) at 40 C or 20 C (as applicable) and 85 C
40、or 120 C (as required by the operating conditions). At each test temperature, the following criteria shall be met:1) opening pressures 15 % of the manufacturers set pressure;2) re-seating pressures no less than 80 % of the set pressure;3) all re-seating pressures within 15 % of the average re-seatin
41、g pressure.4 ISO 2015 All rights reservedBS ISO 15500-12:2015ISO 15500-12:2015(E)Bibliography1 ISO 3833, Road vehicles Types Terms and definitions2 ISO 15403-1, Natural gas Natural gas for use as a compressed fuel for vehicles Part 1: Designation of the quality3 ISO/TR 15403-2, Natural gas Natural g
42、as for use as a compressed fuel for vehicles Part 2: Specification of the quality ISO 2015 All rights reserved 5BS ISO 15500-12:2015ISO 15500-12:2015(E) ISO 2015 All rights reservedICS 43.060.40Price based on 5 pagesThis page deliberately left blankBSI is the national body responsible for preparing
43、British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardization products are published by BSI Standards Limited.British Standards Institution (BSI)BSI Group Headquarters389 Chiswick High Road Londo
44、n W4 4AL UKAbout usWe bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into standards -based solutions.The knowledge embodied in our standards has been carefully assembled in a dependable format and refined through our o
45、pen consultation process. Organizations of all sizes and across all sectors choose standards to help them achieve their goals.Information on standardsWe can provide you with the knowledge that your organization needs to succeed. Find out more about British Standards by visiting our website at or co
46、ntacting our Customer Services team or Knowledge Centre.Buying standardsYou can buy and download PDF versions of BSI publications, including British and adopted European and international standards, through our website at where hard copies can also be purchased. If you need international and foreig
47、n standards from other Standards Development Organizations, hard copies can be ordered from our Customer Services team.SubscriptionsOur range of subscription services are designed to make using standards easier for you. For further information on our subscription products go to British Standards On
48、line (BSOL) youll have instant access to over 55,000 British and adopted European and international standards from your desktop. Its available 24/7 and is refreshed daily so youll always be up to date. You can keep in touch with standards developments and receive substantial discounts on the purchas
49、e price of standards, both in single copy and subscription format, by becoming a BSI Subscribing Member. PLUS is an updating service exclusive to BSI Subscribing Members. You will automatically receive the latest hard copy of your standards when theyre revised or replaced. To find out more about becoming a BSI Subscribing Member and the benefits of membership, ple
