1、 ISO 2012 Road vehicles Compressed natural gas (CNG) fuel system components Part 9: Pressure regulator Vhicules routiers Composants des systmes de combustible gaz naturel comprim (GNC) Partie 9: Rgulateur de pression INTERNATIONAL STANDARD ISO 15500-9 Second edition 2012-04-15 Reference number ISO 1
2、5500-9:2012(E) ISO 15500-9:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 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 microf
3、ilm, without permission in writing 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.org Web www.iso.org Published in Switzerland ISO 15500-
4、9:2012(E) 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 member body interested in a subject for
5、 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 Electrotechnical Commission (IEC) on a
6、ll matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are
7、 circulated to the member bodies for voting. 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 document may be the subject of patent rights. ISO shall not be held re
8、sponsible for identifying any or all such patent rights. ISO 15500-9 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 25, Vehicles using gaseous fuels. This second edition cancels and replaces the first edition (ISO 15500-9:2001), which has been technically revised. ISO
9、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
10、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) Part 14: Excess flow valve Part 15: Gas-tight housing and ventilation hose Part 16: R
11、igid fuel line in stainless steel Part 17: Flexible fuel line Part 18: Filter Part 19: Fittings ISO 2012 All rights reserved iii ISO 15500-9:2012(E) Part 20: Rigid fuel line in material other than stainless steel iv ISO 2012 All rights reserved ISO 15500-9:2012(E) Introduction For the purposes of th
12、is part of ISO 15500, all fuel system components in contact with natural gas have been considered suitable for natural gas as defined in ISO 15403. However, it is recognized that miscellaneous components not specifically covered herein can be examined to meet the criteria of this part of ISO 15500 a
13、nd tested according to the appropriate functional tests. All references to pressure in this part of ISO 15500 are considered to be gauge pressures unless otherwise specified. This part of ISO 15500 is based on a service pressure for natural gas used as fuel of 20 MPa 200 bar 1) settled at 15 C. Othe
14、r 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. 1) 1 bar = 0,1 MPa = 10 5Pa; 1 MPA = 1 N/mm 2 . ISO 2012 All rights reserved v Road vehicles C
15、ompressed natural gas (CNG) fuel system components Part 9: Pressure regulator 1 Scope This part of ISO 15500 specifies tests and requirements for the pressure regulator, a compressed natural gas (CNG) fuel system component intended for use on the types of motor vehicles defined in ISO 3833. This par
16、t of ISO 15500 is applicable to vehicles (mono-fuel, bi-fuel or dual-fuel applications) using natural gas in accordance with ISO 15403. It is not applicable to the following: a) liquefied natural gas (LNG) fuel system components located upstream of, and including, the vaporizer; b) fuel containers;
17、c) stationary gas engines; d) container-mounting hardware; e) electronic fuel management; f) refuelling receptacles. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated ref
18、erences, the latest edition of the referenced document (including any amendments) applies. ISO 15500-1, Road vehicles Compressed natural gas (CNG) fuel system components Part 1: General requirements and definitions ISO 15500-2, Road vehicles Compressed natural gas (CNG) fuel system components Part 2
19、: Performance and general test methods 3 T erms and definitio ns For the purposes of this document, the terms and definitions given in ISO 15500-1 and the following apply. 3.1 lock-up pressure stabilized outlet pressure of the regulator at 0 (zero) flow 4 Marking Marking of the component shall provi
20、de sufficient information to allow the following to be traced: a) the manufacturers or agents name, trademark or symbol; INTERNATIONAL STANDARD ISO 15500-9:2012(E) ISO 2012 All rights reserved 1 ISO 15500-9:2012(E) b) the model designation (part number); c) the working pressure or working pressure a
21、nd temperature range; d) the maximum outlet pressure. The following additional markings are recommended: the direction of flow (when necessary for correct installation); the type of fuel; electrical ratings (if applicable); the symbol of the certification agency; the type approval number; the serial
22、 number or date code; 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 more than one part. 5 Construction and assembly The pressure regulator shall comply with the applicable provisi
23、ons of ISO 15500-1 and ISO 15500-2, and with the tests specified in Clause 6 of this part of ISO 15500. The components downstream of the pressure regulator shall be protected from exposure to full upstream pressure. The pressure relief valve used for this purpose shall reset after relieving. A press
24、ure relief valve may be integral to the pressure regulator. The pressure regulator shall have a factory-set maximum outlet pressure. The maximum outlet pressure rating and the inlet working pressure rating shall be marked on the regulator. 6 Tests 6.1 Applicability The tests required to be carried o
25、ut are indicated in Table 1. 2 ISO 2012 All rights reserved ISO 15500-9:2012(E) Table 1 Applicable tests Test Applicable Test procedure as required by ISO 15500-2 Sp eci fic t est requirement s of this part of ISO 15500 Hydrostatic strength X X X (see 6.2) Leakage (external) X X X (see 6.3) Excess t
26、orque resistance X X Bending moment X X Continued operation X X X (see 6.4) Corrosion resistance X X Oxygen ageing X X Electrical over-voltages X X Non-metallic material immersion X X Vibration resistance X X Brass material compatibility X X Insulation resistance X X (see 6.5) Minimum opening voltag
27、e X X (see 6.6) Pressure impulse X X (see 6.7) Water jacket freezing X X (see 6.8) 6.2 Hydrostatic strength 6.2.1 Test the pressure regulator according to the procedure for testing hydrostatic strength specified in ISO 15500-2. 6.2.2 Test the inlet of the first stage at a pressure of 2,5 times the w
28、orking pressure. 6.2.3 The chambers downstream of the inlet valve to the pressure regulator shall be tested according to the following procedure. With the inlet to the chamber in the open position and all the outlets plugged: if the chamber has a pressure relief valve, the chamber shall be tested at
29、 2,5 times the relief valves set pressure, with the relief valve removed and the opening plugged; if there is no relief valve, test the chamber to upstream working pressure. 6.2.4 Test the outlet chamber, port and all outlet fittings at 2,5 times the working pressure, or 0,4 MPa (4 bar), whichever i
30、s greater. 6.3 External leakage Test the pressure regulator at the temperatures and pressures given in Table 2. ISO 2012 All rights reserved 3 ISO 15500-9:2012(E) Table 2 Test temperatures and pressures Temperature C Stage Pressure MPa bar (Factor working pressure) First test Second Test 40 or 20 In
31、let to 1 1 0,025 20 Inlet to 1 0,025 1,5 120 Inlet to 1 0,05 40 or 20 Chambers downstream of inlet to 1 1 0,025 20 0,025 1,5 120 0,05 6.4 Continued operation The pressure regulator shall be able to withstand 50 000 cycles without any failure when tested according to the following procedure. Where th
32、e stages of pressure regulation are separate, the working pressure in a) to f) is considered to be the working pressure of the upstream stage. a) Recycle the regulator for 95 % of the total number of cycles at room temperature and at the working pressure. Each cycle shall consist of flow until stabl
33、e outlet pressure has been obtained, after which the gas flow shall be shut off by a downstream valve within 1 s, until the downstream lock-up pressure has stabilized. Stabilized outlet pressures are defined as set pressure 15 % for at least 5 s. The regulator shall comply with 6.3 at room temperatu
34、re at intervals of 20 %, 40 %, 60 %, 80 % and 100 % of room temperature cycles. b) Cycle the inlet pressure of the regulator for 1 % of the total number of cycles at room temperature from 100 % to 50 % of the working pressure. The duration of each cycle shall be no less than 10 s. The regulator shal
35、l comply with 6.3 at room temperature at the completion of this test. c) Repeat the cycling procedure of a) at 120 C at the working pressure for 1 % of the total number of cycles. d) Repeat the cycling procedure of b) at 120 C at the working pressure for 1 % of the total number of cycles. The regula
36、tor shall comply with 6.3 at 120 C at the completion of this test. e) Repeat the cycling procedure of a) at 40 C or 20 C, as applicable and 50 % of working pressure for 1 % of the total number of cycles. f) Repeat the cycling procedure of b) at 40 C or 20 C, as applicable and 50 % of working pressur
37、e for 1 % of the total number of cycles. The regulator shall comply with 6.3 at 40 C or 20 C, as applicable at the completion of this test. g) At the completion of the cycles, the lock-up pressure downstream of the regulator shall not exceed the lock-up pressure specified by the manufacturer. Leakag
38、e tests mentioned in a) through e) above are optional but the leakage test after f) is mandatory. 6.5 Insulation resistance The insulation resistance test is designed to check for a potential failure of the insulation between the two-pin coil assembly and the pressure regulator casing. Apply DC 1 00
39、0 V between one of the connector pins and the housing of the pressure regulator for at least 2 s. The minimum allowable resistance shall be 240 k . 6.6 Minimum opening voltage The minimum opening voltage at room temperature shall be 8 V for a 12 V system and 16 V for a 24 V system. The component sha
40、ll be pressurized at 0,75 times working pressure during the test. 4 ISO 2012 All rights reserved ISO 15500-9:2012(E) 6.7 Pressure impulse 6.7.1 Internal impulse Conduct the following steps for the internal impulse test: a) Subject the pressure regulator with its first stage valve locked in the open
41、position to a sudden application of its working pressure at its inlet. The pressure regulator shall retain or release the pressure without any permanent deformation. b) The lock-up pressure downstream of the regulator shall not exceed the lock-up pressure specified by the manufacturer. This test was
42、 included in order to evaluate the performance of the components that may suffer from the effects of an instantaneous increase in pressure. In normal service, this may happen for example, when filling gas in an empty system or when a solenoid valve opens the flow of gas to an empty fuel line. Previo
43、us tests have revealed that certain designs cannot cope with these instantaneous pulses and the components tend to bend or jam. 6.7.2 External impulse The pressure regulator shall withstand 100 inlet pressure pulses, as follows. a) If the regulator has an integrated solenoid valve, it shall be opene
44、d by application of the rated voltage. b) The outlet of the regulator shall be vented until the inlet fuel line is at atmospheric pressure and then closed. c) Working pressure shall be instantaneously applied to the regulator inlet. The pressure regulator shall contain or vent the pressure without a
45、ny permanent deformation. The pressure regulator shall meet the requirements of the external leakage in accordance with 6.3, and the lock-up pressure shall not exceed the manufacturers rated lock-up pressure. The internal impulse test in 6.7.1 tests the reaction of the regulator under a pressure pul
46、se that enters into the first stage chamber, for example if the pressure regulator has no gas in it, the inlet valve is open and the cylinder valve opens instantaneously or the system is connected to a filling dispenser. The external impulse test in this subclause tests the resistance of the inlet v
47、alve to pulses on the high pressure side, for example, a pressure regulator with normal working pressure inside but with no pressure in the fuel line and there is a sudden opening of the cylinder valve filled with service pressure. 6.8 Water jacket freezing Conduct the following steps for the water
48、jacket freezing test: a) Attach 1 m sections of coolant hose to the coolant inlet and outlet of the regulator or water jacket. Fill the regulator or water jacket, which normally contains an antifreeze solution, with water, to normal capacity and expose it at 40 C 2 C or 20 C 2 C, as applicable, for
49、24 h. b) Following the freezing conditioning, and after exposing the assembly to 20 C 2 C for a minimum of 24 h, conduct an external leakage test at room temperature according to 6.3. A separate sample may be used for this test. ISO 2012 All rights reserved 5 ISO 15500-9:2012(E) Bibliography 1 ISO 3833, Road vehicles Types Terms and definitions 2 ISO 15403-1, Natural gas Natural gas for use as a compress
