1、BSI Standards PublicationBS ISO 12614-7:2014Road vehicles Liquefiednatural gas (LNG) fuel systemcomponentsPart 7: Pressure relief valveBS ISO 12614-7:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 12614-7:2014.The UK participation in its preparation was e
2、ntrusted 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 responsible for its
3、correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 77153 8ICS 43.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Stra
4、tegy Committee on 31 July 2014.Amendments issued since publicationDate Text affectedBS ISO 12614-7:2014 ISO 2014Road vehicles Liquefied natural gas (LNG) fuel system components Part 7: Pressure relief valveVhicules routiers quipements pour vhicules utilisant le gaz naturel liqufi (GNL) comme combust
5、ible Partie 7: Soupape de scurit la pressionINTERNATIONAL STANDARDISO12614-7First edition2014-07-01Reference numberISO 12614-7:2014(E)BS ISO 12614-7:2014ISO 12614-7:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of
6、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 ISOs member body in
7、 the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 12614-7:2014ISO 12614-7:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Norm
8、ative references 13 Terms and definitions . 14 Marking 25 Construction and assembly . 26 Test 26.1 Applicability 26.2 Hydrostatic strength 36.3 Leakage 36.4 Continued operation 36.5 Operational test 3BS ISO 12614-7:2014ISO 12614-7:2014(E)ForewordISO (the International Organization for Standardizatio
9、n) 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 rep
10、resented 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 dev
11、elop 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 IS
12、O/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
13、 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 meani
14、ng 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 the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, R
15、oad 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
16、valve Part 4: Manual valve Part 5: Tank pressure gauge Part 6: Overpressure 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 material other than s
17、tainless steel Part 13: Pressure control regulator Part 14: Differential pressure fuel content gauge Part 15: Capacitance fuel content gaugeiv ISO 2014 All rights reservedBS ISO 12614-7:2014ISO 12614-7:2014(E) Part 16: Heat exchanger - vaporizer Part 17: Natural gas detector Part 18: Gas temperature
18、 sensor ISO 2014 All rights reserved vBS ISO 12614-7:2014BS ISO 12614-7:2014Road vehicles Liquefied natural gas (LNG) fuel system components Part 7: Pressure relief valve1 ScopeThis part of ISO 12614 specifies tests and requirements for the pressure relief valve (PRV), a liquefied natural gas fuel s
19、ystem component intended for use on the types of motor vehicles defined in ISO 3833. 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 th
20、at 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 specif
21、ied.NOTE 3 This part of ISO 12614 is based upon a working pressure for natural gas as a fuel of 1,6 MPa 16 bar1). Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For example, 2 MPa (20 bar) working pressure system will require pressures to be
22、multiplied by 1,25.2 Normative referencesThe 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 (i
23、ncluding any amendments) applies.ISO 3833, Road vehicles Types Terms and definitionsISO 12614-1, Road vehicles Liquefied natural gas (LNG) fuel system components Part 1: General requirements and definitionsISO 12614-2, Road vehicles Liquefied natural gas (LNG) fuel system components Part 2: Performa
24、nce and general test methods3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 12614-1 and the following apply.1) 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.INTERNATIONAL STANDARD ISO 12614-7:2014(E) ISO 2014 All rights reserved 1BS ISO 12614-7:2014ISO 12
25、614-7:2014(E)3.1set pressurepressure at which it is intended that the PRV opens4 MarkingMarking of the component shall provide sufficient information to allow the following to be traced:a) the manufacturers or agents name, trademark, or symbol;b) the model designation (part number);c) the working pr
26、essure or pressure and temperature range.The following additional markings are recommended:a) the direction of flow (when necessary for correct installation);b) the type of fuel;c) electrical ratings (if applicable);d) the symbol of the certification agency;e) the type approval number;f) the serial
27、number or date code;g) reference to this part of ISO 12614 (i.e. ISO 12614-7).NOTE This information can be provided by a suitable identification code on at least one part of the component when it consists of more than one part.5 Construction and assemblyThe PRV shall comply with the applicable provi
28、sions of ISO 12614-1 and ISO 12614-2 and with the tests specified in Clause 6 of this part of ISO 12614.6 Test6.1 ApplicabilityThe tests required to be carried out are indicated in Table 1.2 ISO 2014 All rights reservedBS ISO 12614-7:2014ISO 12614-7:2014(E)Table 1 Tests applicableTest ApplicableTest
29、 procedure as required by ISO 12614-2Specific test requirements of this part of ISO 12614Hydrostatic 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 X (see 6.5)Corrosion resistance X XOxygen ageing X XElect
30、rical over voltagesNon-metallic synthetic 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 12614-2, at 2,5 times its working pressure, specified by its manufacturer.F
31、or the purposes of this test, the PRVs mechanism shall be removed and its orifice blocked.6.3 LeakageTest the PRV at temperatures less than 162 C and 85 C (if required by the operating conditions) at working pressure.6.4 Continued operationThe PRV shall be capable of withstanding 600 cycles of opera
32、tion when tested according to the provisions of the continued operation test procedure given in ISO 12614-2 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 pr
33、essure. When the PRV re-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 10s + 2s.6.5 Operational test6.5.1 GeneralVerify the opening and re-seating pressures of the PRV. The opening pressure shall
34、be equal to the set pressure 5 % at 20 C, +5 % at less than 162 C and +5 % at 85 C or 120 C (if 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 ord
35、er given. Appropriate test media shall be chosen (i.e. air, ISO 2014 All rights reserved 3BS ISO 12614-7:2014ISO 12614-7:2014(E)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
36、 values for the samples at 20 C. Do this by first slowly pressurizing the inlet of the sample to 110 % of the set pressure, noting the value at which it first opens.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
37、irements are met: opening pressures shall be 5 % of the manufacturers set pressure; re-seating pressures shall be no less than 90 % of the set pressure; re-seating pressures shall be within 5 % of the average re-seating pressure.c) Repeat a) and b) at 40 C and 85 C or 120 C (if required by the opera
38、ting conditions). At each test temperature, the following criteria shall be met: opening pressures 15 % of the manufacturers set pressure; re-seating pressures no less than 80 % of the set pressure; re-seating pressures within +15 % of the average re-seating pressure.4 ISO 2014 All rights reservedBS
39、 ISO 12614-7:2014BS ISO 12614-7:2014ISO 12614-7:2014(E) ISO 2014 All rights reservedICS 43.060.40Price based on 4 pagesThis page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and services.BSI is incor
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