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1、Reference number ISO 15500-2:2001(E) ISO 2001 INTERNATIONAL STANDARD ISO 15500-2 First edition 2001-02-15 Road vehicles Compressed natural gas (CNG) fuel system components Part 2: Performance and general test methods Vhicules routiers Composants des systmes de combustible gaz naturel comprim (GNC) P
2、artie 2: Performances et mthodes dessai gnrales ISO 15500-2:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installe
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5、se inform the Central Secretariat at the address given below. ISO 2001 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing
6、 from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2001 All rights reserved -,-,- ISO 1550
7、0-2:2001(E) ISO 2001 All rights reservediii Foreword ISO (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 membe
8、r 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 Elec
9、trotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting
10、. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this part of ISO 15500 may be the subject of patent rights. ISO shall not be held responsible for identifying any or a
11、ll such patent rights. InternationalStandardISO 15500-2waspreparedbyTechnicalCommitteeISO/TC 22,Roadvehicles, Subcommittee SC 25, Road vehicles using natural gas. ISO 15500 consists of the following parts, under the general title Road vehicles Compressed natural gas (CNG) fuel system components: ?Pa
12、rt 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: Automatic valve ?Part 7: Gas injector ?Part 8: Pressure indicator ?Part 9: Pressure regulator ?Part 10: Gas-flow adjuster ?Part
13、11: Gas/air mixer ?Part 12: Pressure relief valve (PRV) ?Part 13: Pressure relief device (PRD) ?Part 14: Excess flow valve ?Part 15: Gas-tight housing and ventilation hose -,-,- ISO 15500-2:2001(E) iv ISO 2001 All rights reserved ?Part 16: Rigid fuel line ?Part 17: Flexible fuel line ?Part 18: Filte
14、r ?Part 19: Fittings -,-,- INTERNATIONAL STANDARDISO 15500-2:2001(E) ISO 2001 All rights reserved1 Road vehicles Compressed natural gas (CNG) fuel system components Part 2: Performance and general test methods 1Scope This part of ISO 15500 specifies performance and general test methods for compresse
15、d natural gas 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 using natural gas in accordance with ISO 15403 (mono-fuel, bi-fuel or dual-fuel applications). It is not applicable to the following: a)liquefied
16、 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. NOTE 1It is recognized that miscellaneous components not specifically cover
17、ed herein can be examined to meet the criteria of this part of ISO 15500 and tested according to the appropriate functional tests NOTE 2All references to pressure in this part of ISO 15500 are to be considered gauge pressures unless otherwise specified. NOTE 3This part of ISO 15500 is based upon a s
18、ervice pressure for natural gas 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. 2Normative re
19、ferences The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 15500. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this
20、part of ISO 15500 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid Inte
21、rnational Standards. 1)1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2 ISO 15500-2:2001(E) 2 ISO 2001 All rights reserved ISO 188:1998, Rubber, vulcanized or thermoplastic Accelerated ageing and heat resistance tests. ISO 1817, Rubber, vulcanized Determination of the effect of liquids. ISO 3833:1977, Road
22、vehicles Types Terms and definitions. ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests. ISO 15403, Natural gas Designation of the quality of natural gas for use as a compressed fuel for vehicles. ISO 15500-1:2000, Road vehicles Compressed natural gas (CNG) fuel system components
23、General requirements and definitions. ISO 15500-3, Road vehicles Compressed natural gas (CNG) fuel system components Part 3: Check valve. ISO 15500 (parts 4 to 19), Road vehicles Compressed natural gas (CNG) fuel system components. 3Terms and definitions For the purposes of this part of ISO 15500, t
24、he terms and definitions given in ISO 15500-1 apply. 4General 4.1Unless otherwise stated, the tests shall be conducted at room temperature: i.e. 20 C?5 C. 4.2Components shall comply with the tests specified in ISO 15500-3 and subsequent parts, as well as the applicable tests specified in this part o
25、f ISO 15500. 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 another, relevant part. 4.3Unless otherwise specified, all tests shall be conducted
26、using dry air or nitrogen. Qualified personnel may also test with natural gas provided that appropriate safety measures are taken. The dewpoint of the test gas at the test pressure shall be at the temperature at which there is no icing, or hydrate or liquid formation. 4.4It is recognized that new te
27、chnology may not be covered in ISO 15500-3 or subsequent parts of ISO 15500. 5Hydrostatic strength A component shall not rupture when 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
28、a test fluid, the hydrostatic pressure specified in ISO 15500-3 and subsequent parts of ISO 15500 to the inlet of the component for a period of at least 3 min. The samples used in this test shall not be used for any other testing. 6Leakage 6.1General 6.1.1Prior to conditioning, purge the component o
29、r device with nitrogen and then seal it at 30 % of service pressure using nitrogen, dry air or natural gas. -,-,- ISO 15500-2:2001(E) ISO 2001 All rights reserved3 6.1.2Conduct all tests while the device is continuously exposed to the specified test temperatures. The device shall either be bubble-fr
30、ee or have a leakage rate of less than 20 cm3/h (normal) using the following test method. 6.2External leakage 6.2.1Plug each device outlet with the appropriate mating connection and apply the test pressure to the inlet. 6.2.2Apply pressurized air, nitrogen, or natural gas to the test device. 6.2.3At
31、 all 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 method. 6.2.4If there are no bubbles for the specified time period, the sample passes the test. If bubbles are detected, measure the leak ra
32、te by an appropriate method. 6.3Internal leakage 6.3.1The internal leakage test is applicable only to devices having a closed position. The aim of this test is to check the pressure tightness of the closed system. 6.3.2Connect the inlet or outlet (as applicable) of the device, with the appropriate m
33、ating connection, while leaving the opposite connection or connections open. 6.4Test conditions 6.4.1General The leakage test conditions depend on whether the component is exposed to cylinder pressure or located downstream of the first stage of pressure reduction. 6.4.2Devices exposed to cylinder pr
34、essure 6.4.2.1The device shall be conditioned at a low temperature of?40 C, and pressurized at 75 % and 2,5 % of service pressure. 6.4.2.2The device shall be conditioned at a room temperature of 20 C and pressurized at 2,5 % and 150 % of service pressure. 6.4.2.3The device shall be conditioned at a
35、high temperature of 85 C or 120 C and pressurized at 5 % and 150 % of service pressure. 6.4.3Devices downstream of the first stage of pressure reduction 6.4.3.1The device shall be conditioned at a low temperature of?40 C, and pressurized at 75 % and 2,5 % of working pressure. 6.4.3.2The device shall
36、 be conditioned at a room temperature of 20 C and pressurized at 2,5 % and 150 % of working pressure. 6.4.3.3The device shall be conditioned at a high temperature of 85 C or 120 C and pressurized at 5 % and 150 % of working pressure. -,-,- ISO 15500-2:2001(E) 4 ISO 2001 All rights reserved 7Excess t
37、orque resistance A 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 installation value, according to the following test procedure. a)Test an unused component, applying th
38、e torque adjacent to the fitting. b)For a component having a threaded connection or threaded connections, apply the turning effort for 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. 8Bendin
39、g moment A component shall be capable of operation without cracking, breaking, or leaking when tested according to the following procedure. a)Assemble the connections of the component, leak-tight, to an appropriate mating connection or connections, representative of design intent. After assembly, th
40、e length 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, except in the following cases: ?if the component has an integral mounting means independent of the inlet and outlet connections, the componen
41、t shall be mounted using the integral mounting means specified by the manufacturer; ?if the component is intended to be mounted by 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 leak
42、s prior to subjecting it to d). d)With the component in the closed position, pressurize the system to 5 kPa (50 mbar) and apply a force according to Table 1, 300 mm from the inlet, maintaining it for 15 min. Without removing the force, check the component for leakage, in accordance with the test met
43、hod given in clause 6, at room temperature. NOTEDepending on how this test is performed, raising the load to compensate buoyancy could be necessary. e)Conduct procedure d) four times, rotating the component 90 around the horizontal axis between each test. Between tests, open and close (if applicable
44、) the component three times with the bending moment removed. f)At the completion of the above tests, remove the component and examine it for deformation; then subject it to the leakage test according to clause 6. -,-,- ISO 15500-2:2001(E) ISO 2001 All rights reserved5 Table 1 Bending moment test for
45、ce Outside diameter of tubing mm Force N 63,4 89,0 W1217,0 Dimensions in millimetres Key 1Component 2Force point a 4 ? 90? rotation. Figure 1 Bending moment 9Continued operation 9.1General For the details of test methods for particular components, see the other parts of ISO 15500. The method specifi
46、ed in this clause is general in nature and also applies to miscellaneous components. 9.2Test method 9.2.1Test procedure Connect the component securely by a suitable fitting to a pressurized source of dry air, nitrogen or natural gas and subject it to the number of cycles specified in ISO 15500-3 and
47、 subsequent parts of ISO 15500. A cycle shall consist of one opening and (if applicable) one closing of the component within a period of not less than 10 s?2 s. ISO 15500-2:2001(E) 6 ISO 2001 All rights reserved During the off-cycle, the downstream pressure of the test fixture shall be lowered to a
48、maximum of 50 % of the test pressure. In the case of components downstream of the first stage of pressure reduction, the test pressure shall be based on 100 % of the working pressure. Unless otherwise specified, the conditions of 9.2.2 and 9.2.3 apply. 9.2.2Room temperature cycling Operate the component through 96 % of the total cycles at room temperature and at service pressure, according to clause 6. This test may be interrupted, if desired, at 20 % intervals for leakage testing. 9.2.3High temperature cycling Operate the component