1、BSI Standards PublicationBS ISO 12614-2:2014Road vehicles Liquefiednatural gas (LNG) fuel systemcomponentsPart 2: Performance and general testmethodsBS ISO 12614-2:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 12614-2:2014.The UK participation in its pre
2、paration 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 respon
3、sible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 77043 2ICS 43.060.40Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards P
4、olicy and Strategy Committee on 31 July 2014.Amendments issued since publicationDate Text affectedBS ISO 12614-2:2014 ISO 2014Road vehicles Liquefied natural gas (LNG) fuel system components Part 2: Performance and general test methodsVhicules routiers quipements pour vhicules utilisant le gaz natur
5、el liqufi (GNL) comme combustible Partie 2: Performances et mthodes dessai gnralesINTERNATIONAL STANDARDISO12614-2First edition2014-07-01Reference numberISO 12614-2:2014(E)BS ISO 12614-2:2014ISO 12614-2:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. U
6、nless 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 th
7、e address below or ISOs member body in 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 12614-2:2014ISO 12614-2:2014(E) ISO 2014 All rights reserved iiiCon
8、tents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 General 25 Hydrostatic strength . 26 Leakage. 27 Excess torque resistance 38 Bending moment 39 Continued operation. 49.1 General . 49.2 Components, which are intended to be used at temperatures less than 40 C 59.3 C
9、omponents, which are not intended to be used at temperatures less than 40 C 510 Corrosion resistance . 511 Oxygen ageing 512 Electrical overvoltages . 613 Non-metallic material immersion 614 Vibration resistance 615 Brass material compatibility . 6Bibliography 8BS ISO 12614-2:2014ISO 12614-2:2014(E)
10、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 member body interested in a subject for which a te
11、chnical 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
12、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 documen
13、t 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
14、 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
15、 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 the following URL: Foreword - Supplementary informat
16、ionThe 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 definitio
17、ns 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:
18、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 gaugeiv ISO 2014 All rights reservedBS ISO 12614-2:2014ISO 12614-2:2014(E) Part 16: Heat exchanger vaporizer Part 17: Nat
19、ural gas detector Part 18: Gas temperature sensor ISO 2014 All rights reserved vBS ISO 12614-2:2014BS ISO 12614-2:2014Road vehicles Liquefied natural gas (LNG) fuel system components Part 2: Performance and general test methods1 ScopeThis part of ISO 12614 specifies general requirements and definiti
20、ons 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
21、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 recept
22、acles.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 p
23、ressures 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/mm2.) Other working pressures can be accommodated by adjusting the pressure by the appropriate factor (ratio). For ex
24、ample, a 2 MPa (20 bar) working pressure system will require pressures to be 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 appl
25、ies. 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 testsISO 12614-1:2014, Road vehicles Liquefied natural gas (LNG) fuel system components Part 1: Gener
26、al requirements and definitionsISO 15500-2:2012, 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 in ISO 12614-1 apply.INTERNATIONAL STANDARD ISO 12614-2:2
27、014(E) ISO 2014 All rights reserved 1BS ISO 12614-2:2014ISO 12614-2:2014(E)4 General4.1 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 a
28、ny 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
29、 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
30、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
31、 strengthA 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 appli
32、ed 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 LeakagePrior 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 tes
33、ts shall be conducted while the devices are continuously exposed to the specified test temperatures. The device shall either be bubble free or have a leakage rate less than 20 Ncm3/h according to the following test method.External leakageEach device outlet shall be plugged with the appropriate matin
34、g connection and the test pressure applied to the inlet.Pressurized air, nitrogen, or natural gas shall be applied to the test devices.At all the test temperatures, immerse the components in a suitable test medium for 2 min or use a helium vacuum test (global accumulation method) or other equivalent
35、 methods.If there are no bubbles for the specified time period, the sample passes the test. If bubbles are detected, then the leak rate shall be measured by an appropriate method.Internal leakageThe internal leakage is applicable only to devices having a closed position. The aim of this test is to c
36、heck the pressure tightness of the closed system.The inlet or outlet of the device (as applicable) shall be connected with the appropriate mating connection while the opposite connection(s) shall be left open.2 ISO 2014 All rights reservedBS ISO 12614-2:2014ISO 12614-2:2014(E)Test conditions for int
37、ernal and external leakagea) The device shall be conditioned at a low temperature of 162 C and pressurized at 100 % and 25 % of working pressure.b) The device shall be conditioned at room temperature of 20 C and pressurized at 25 % and 150 % of working pressure.c) The device shall be conditioned at
38、a high temperature of 85 C/120 C and pressurized at 25 % and 150 % of working pressure.7 Excess torque resistanceA component designed to be connected directly to threaded fittings shall be capable of withstanding without deformation, breakage, or leakage a torque effort of 150 % of the rated install
39、ation value.The following test method shall apply.a) An unused component shall be used for this test. The torque shall be applied adjacent to the fitting.b) For a component having threaded connection(s), the turning effort shall be applied for 15 min, then released, and the component removed and exa
40、mined for deformation and breakage. The component shall then be subjected to the leakage test specified in Clause 6.c) Subject the component to the leakage test specified in Clause 6.d) Subject the component to the hydrostatic strength test specified in Clause 58 Bending momentA component subject to
41、 bending moment tests shall be capable of operation without cracking, breaking, or leaking when subjected to the following test method.a) The connections of the component shall be assembled leak-tight to an appropriate mating connection(s), representative of design intent. After assembly, the length
42、 of the inlet tubing shall be greater than 300 mm (see Figure 1).b) The outlet connection shall be rigidly supported 25 mm from the component outlet, unless the following exceptions apply: when the component has an integral mounting means independent of the inlet and outlet connections, the componen
43、t shall be mounted using the integral mounting means as specified by the manufacturer; when the component is intended to be mounted by either the integral mounting means or the component outlet, the mounting means which produces the most severe test condition shall be used.c) This assembly above sha
44、ll be checked for leaks prior to section d).d) With the component in the closed position, the system shall be pressurized to 5 kPa and a force as specified in Table 1 at 300 mm from the inlet shall be applied and maintained for 15 min. Without removing the force, the component shall be checked for l
45、eakage, in accordance with the test method in Clause 6 at room temperature.NOTE Depending on how this is performed, raising the load to compensate buoyancy could be necessary.e) The test in section d) shall be conducted four times with the component being rotated 90 around the horizontal axis betwee
46、n each test. Between tests, the components shall be opened and closed (if applicable) three times with the bending moment removed. ISO 2014 All rights reserved 3BS ISO 12614-2:2014ISO 12614-2:2014(E)f) At the completion of the above tests, the component shall be removed and examined for deformation
47、and then subjected to the leakage test as specified in Clause 6 and to the hydrostatic strength test according to Clause 5.Table 1 Bending test forceOutside diameter of tubing mmForce N6 3,48 9,012 17,016 30,0Dimensions in millimetresKey1 component2 force pointa4 90 rotationFigure 1 Bending moment9
48、Continued operation9.1 GeneralDetailed test methods for each component can be found in the appropriate parts of this part of ISO 12614. The test method detailed below is general in nature and also applies to miscellaneous components.Connect the component securely by a suitable fitting to a source of
49、 compressed dry air, nitrogen, or natural gas and subject it to the number of cycles specified in ISO 12614-3 and subsequent parts of ISO 12614. A cycle shall consist of one opening and one closing (if applicable) of the component within a period of not less than 10 s 2 s. During the off cycle, the downstream pressure of the test fixture shall be lowered to a maximum of 50 % of the test pressure.4 ISO 2014 All rights reservedBS ISO 12614-2:2014ISO 12614-2:2014(E)In the case of comp
