1、BS ISO 15501-2:2016Road vehicles Compressed natural gas (CNG) fuel systemsPart 2: Test methodsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06BS ISO 15501-2:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 15501-2:2016.The U
2、K participation in its preparation was entrusted to Technical Committee GSE/40, Gas supply equipment for natural gas vehicles.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of
3、 a contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 89439 8 ICS 43.060.40 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published unde
4、r the authority of the Standards Policy and Strategy Committee on 30 November 2016.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 15501-2:2016 ISO 2016Road vehicles Compressed natural gas (CNG) fuel systems Part 2: Test methodsVhicules routiers Systmes dalimentation
5、 en gaz naturel comprim (GNC) Partie 2: Mthodes dessaiINTERNATIONAL STANDARDISO15501-2Second edition2016-11-15Reference numberISO 15501-2:2016(E)BS ISO 15501-2:2016ISO 15501-2:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Un
6、less 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
7、 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 15501-2:2016ISO 15501-2:2016(E)Foreword iv1 Scope . 12 Normative references
8、13 Terms and definitions . 14 Test methods . 24.1 Cylinder mounting strength tests . 24.1.1 General 24.1.2 Inertia test . 24.1.3 Static test 24.1.4 Alternative method 34.1.5 Acceptance criteria 34.2 Leak test 34.3 Functional test . 44.3.1 Main shut-off valve test 44.3.2 Receptacle clearance test . 4
9、4.4 Receptacle mounting tests 4Annex A (informative) Engineering experience for the mounting of steel cylinders 5Bibliography 9 ISO 2016 All rights reserved iiiContents PageBS ISO 15501-2:2016ISO 15501-2:2016(E)ForewordISO (the International Organization for Standardization) is a worldwide federatio
10、n 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.
11、 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 thos
12、e 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 (s
13、ee 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 docu
14、ment 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
15、expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the 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 vehi
16、cles, Subcommittee SC 41, Specific aspects for gaseous fuels.This second edition cancels and replaces the first edition (ISO 15501-2:2001), which has been technically revised.A list of all parts in the ISO 15501 series can be found on the ISO website.iv ISO 2016 All rights reservedBS ISO 15501-2:201
17、6INTERNATIONAL STANDARD ISO 15501-2:2016(E)Road vehicles Compressed natural gas (CNG) fuel systems Part 2: Test methods1 ScopeThis document specifies the test methods for checking the minimum safety requirements specified in ISO 15501-1. It is applicable to the functionality of the fuel systems desi
18、gned to operate on compressed natural gas of motor vehicles as defined in ISO 3833.NOTE For tests of individual components, refer to the parts of ISO 15500, ISO 14469 and ISO 11439.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their conte
19、nt constitutes requirements of this document. For dated references, only the edition indicated applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6487, Road vehicles Measurement techniques in impact tests InstrumentationISO 11439, Ga
20、s cylinders High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehiclesISO 15501-1:1), Road vehicles Compressed natural gas (CNG) fuel systems Part 1: Safety requirements3 Terms and definitionsFor the purposes of this document, the terms and definitions given in
21、 ISO 15500-1, ISO 15501-1 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1notified bodygovernment
22、 appointed body mandated to approve or disapproveEXAMPLE Laboratories, universities and companies.1) Under preparation. ISO 2016 All rights reserved 1BS ISO 15501-2:2016ISO 15501-2:2016(E)4 Test methods4.1 Cylinder mounting strength tests4.1.1 GeneralWhen a vehicle is equipped with several cylinders
23、, they should preferably be tested as a unit.When groups of cylinders are installed on a vehicle such that they are separately anchored to the original structure of the vehicle, then each separate group of cylinders may be tested individually.When performing these tests, accessories and piping shall
24、 not contribute to reinforcing the cylinder mounting.The requirements of ISO 15501-1:, 4.4.3, shall be verified by the test specified in 4.1.2, 4.1.3, 4.1.4 or 4.1.5.4.1.2 Inertia testThe cylinder or cylinders to be tested shall be mounted on the vehicle body or a part of the vehicle body, according
25、 to the specifications of the original equipment manufacturer (OEM) or after-market converter.The vehicle body or part of the vehicle body shall be firmly anchored to the test trolley. The method used for anchoring the vehicle body to the test trolley shall not result in reinforcement of the cylinde
26、r anchorages or the part of the vehicle structure participating in anchoring the cylinder or cylinders. Testing performed with a trolley shall geometrically match original vehicle conditions.The test shall be carried out using the following procedure.a) Fill the cylinder or cylinders with a mass cor
27、responding to at least 90 % of the mass of natural gas capacity at 20 MPa (200 bar)2)and 15 C. The gas density for these conditions shall be considered to be equal to 0,2 kg/l.b) Measure the trolley deceleration with data channels of channel frequency class (CFC) 60 corresponding to the characterist
28、ics given in ISO 6487.c) Maintain the value of the deceleration as defined in ISO 15501-1, for the vehicle category, for at least 30 ms.4.1.3 Static testThis test may be carried out on a vehicle body or on a part of a vehicle body.The cylinder or cylinders to be tested shall be mounted on the vehicl
29、e body or on part of the vehicle body, according to OEM or after-market converter specifications.The method used for anchoring the vehicle body or the part of the vehicle body in this test shall not submit the anchorages and anchorage area (300 mm diameter circle) to abnormal stresses and/or deforma
30、tion, or result in reinforcement of the cylinder or cylinders or cylinder anchorages, or the part of the vehicle structure participating in anchoring the cylinder or cylinders.2) 1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2.2 ISO 2016 All rights reservedBS ISO 15501-2:2016ISO 15501-2:2016(E)The traction
31、 force is defined by Formula (1):F = (Mc+ 0,9 V)a (1)whereF is the traction force, in newtons;Mcis the mass of empty cylinder(s), in kilograms;a is the acceleration as defined in ISO 15501-1:, 4.4.3;V is the volume of the cylinder(s) in litres; is the density of CNG at 20 MPa 0,2 kg/l.The test shall
32、 be carried out using the following procedure.a) Apply the traction force to the cylinder or cylinders centre of gravity in the specified directions within 0,2 s.b) Hold the specified traction force for at least 0,2 s.c) Release the traction force.4.1.4 Alternative methodIf a vehicle crash test is p
33、erformed according to international or equivalent regulations, the requirements of ISO 15501-1, are considered to have been met.A calculation method can be used instead of practical testing if its equivalence can be demonstrated by the applicant for approval.4.1.5 Acceptance criteria4.1.5.1 By testi
34、ngAt the conclusion of either of these tests, the cylinder or cylinders shall remain attached to the vehicle body or part of the vehicle body, and not interfere with the seat structure.4.1.5.2 By calculationAppropriate calculations shall be carried out, depending on the individual technical paramete
35、rs. The method of calculation shall be approved by a authority having jurisdiction.4.1.5.3 By engineering experience (steel cylinders)For details of a practical means of compliance for steel cylinders (type 1 in accordance with ISO 11439), determined as a result of calculations and substantiated by
36、experience over time, see Annex A.4.2 Leak testThis test may be conducted at ambient temperature. It shall be performed on each vehicle after installation.a) Fill the vehicle fuelling system upstream of the first-stage regulator with an appropriate gas at 1 MPa (10 bar) 0,1 MPa. ISO 2016 All rights
37、reserved 3BS ISO 15501-2:2016ISO 15501-2:2016(E)b) Check all connections with a gas detector, foam-producing liquid or any other equivalent method. No bubbles shall be detected during three minutes or the leak rate for each connection shall be less than 20 cm3/h (normal).Perform this test again with
38、 the system upstream of the first regulator at 20 MPa (200 bar) 1 MPa.If the cylinder and its valve have already been leak tested, the leak test shall be performed with the cylinder valve closed.Stop the test if any leakage occurs during the filling from 1 MPa (10 bar) to 20 MPa (200 bar). Where a l
39、eak is detected, it shall be rectified by first relieving any pressure, then resealing. The system shall then be re-tested.4.3 Functional test4.3.1 Main shut-off valve testThe purpose of this test is to ensure that the main shut-off valve is in the closed position when the ignition key is off, the e
40、ngine stalls, cranking on fuel other than CNG, or the engine is not running on CNG.Any appropriate method may be used to ensure test results.4.3.2 Receptacle clearance testEnsure that free space around the receptacle conforms to ISO 15501-1.4.4 Receptacle mounting testsThis test can be performed at
41、ambient temperature either on a vehicle, or as a bench test using a CNG fuel system equivalent in geometry and anchoring to the vehicle. In either case, connect the nozzle to the receptacle and pressurize the CNG fuel system to service pressure.The gas tightness of the CNG fuel system shall not be a
42、ffected aftera) a 670 N pull is applied along the longitudinal axis of the receptacle, andb) a moment of 200 Nm is applied in a worst case manner.Following the above test, the gas tightness of CNG fuelling system shall be checked with an appropriate leak testing method.4 ISO 2016 All rights reserved
43、BS ISO 15501-2:2016ISO 15501-2:2016(E)Annex A (informative) Engineering experience for the mounting of steel cylindersA.1 Single cylindera) There should be at least four points of attachment to the vehicle structure, the distance between which should be sufficient to ensure the stability of the cyli
44、nder.b) Where the cylinder is anchored to sheet metal, the sheet metal should be reinforced at each attachment point with metal plates of areas of no less than 3 600 mm2and a thickness of no less than 2,5 mm. Any such reinforcement plates should be contoured to the shape of the sheet metal or chassi
45、s rail. It is preferred that a round washer be used, but where a square plate is fitted the corners should be radiused to at least 0,5 mm and the bolt hole should be positioned in the centre of the plate/washer. Where the bolt hole is not central in the plate, the nearest edge should be bent to form
46、 an L-section for stiffening.Flat areas, even if ribbed, can be unsuitable for mountings without substantial reinforcement, because of flexing and fatigue. Anchoring should be to structural members where possible.c) The mounting method should not significantly weaken the vehicle structure.d) Where a
47、nchorage bolts pass through a hollow section, a spacer tube should be provided to prevent collapse of that section under load.e) All fasteners should have a diameter of no less than that shown in Table A.1 and should comply with property class 8.8 in accordance with ISO 898-1.f) Where clamping bands
48、 are used, at least two steel bands should be provided, the dimensions of which should be no less than those shown in Table A.1. However, in the case of multiple cylinders mounted together, Table A.1 does not apply.g) Where parts are joined (e.g. by welding a stud to a band), the strength of the joi
49、nt should be not less than the strength of either component.h) Where the attachment is by means of clamping bands, there should be a positive means of resisting longitudinal end loads on the cylinder due to the vehicle impact. The friction grip of the clamping bands is not normally an acceptable means of endwise retention unless the clamping bands can be demonstrated to meet the requirement of ISO 15501-1. An acceptable form of retention is to secure a 200 mm length of 50 50 structural steel angle to the ve
