ISO-15500-13-2001.pdf

Reference number ISO 15500-13:2001(E) ©ISO 2001 INTERNATIONAL STANDARD ISO 15500-13 First edition 2001-04-15 Road vehicles Compressed natural gas (CNG) fuel system components Part 13: Pressure relief device (PRD) Véhicules routiers Composants des systèmes de combustible gaz naturel comprimé (GNC) Partie 13: Dispositifs de limitation de pression ISO 15500-13:2001(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. 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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 15500-13:2001(E) © ISO 2001 All rights reservediii ContentsPage Foreword.iv 1Scope 1 2Normative references1 3Terms and definitions .2 4Marking.2 5Construction and assembly2 6Tests3 6.1Applicability3 6.2Hydrostatic strength3 6.3Leakage.4 6.4Bending moment4 6.5Continued operation4 6.6Accelerated Life.5 6.7Benchtop activation 6 6.8Thermal cycling7 6.9Condensate corrosion resistance7 6.10Flow capacity .7 7Production batch inspection and acceptance testing.8 Annex A (normative) Determination of fusible material yield temperature and PRD activation temperature9 Annex B (informative) PRD trigger temperatures11 ISO 15500-13:2001(E) iv© ISO 2001 All rights reserved 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 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 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. 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 all such patent rights. International Standard ISO 15500-13waspreparedby TechnicalCommitteeISO/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: ?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: Automatic 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 ISO 15500-13:2001(E) © ISO 2001 All rights reservedv ?Part 16: Rigid fuel line ?Part 17: Flexible fuel line ?Part 18: Filter ?Part 19: Fittings Annex A forms a normative part of this part of ISO 15500. Annex B is for information only. INTERNATIONAL STANDARDISO 15500-13:2001(E) © ISO 2001 All rights reserved1 Road vehicles Compressed natural gas (CNG) fuel system components Part 13: Pressure relief device (PRD) 1Scope This part of ISO 15500 specifies tests and requirements for the pressure relief device (PRD), a compressed natural gas fuel system component 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 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 covered 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 service pressure for natural gas as a 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 references 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 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 International Standards. 1)1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2 ISO 15500-13:2001(E) 2© ISO 2001 All rights reserved ISO 3833, Road vehicles Types Terms and definitions. ISO 11439, Gas cylinders High pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles. ISO 15403, Natural gas Designation of the quality of natural gas for use as a compressed fuel for vehicles. 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: Performance and general test methods. 3Terms and definitions For the purposes of this part of ISO 15500, the terms and definitions given in ISO 15500-1 and the following apply. 3.1 combination relief device PRD activated by a combination of high temperature and pressure acting together 3.2 fusible material metal, alloy, or other material capable of being melted 3.3 rupture disc operating part of a PRD which, when installed in the device, is designed to burst at a pre-determined pressure to permit discharge of the cylinder 3.4 thermally activated relief device PRD activated by high temperature and generally containing fusible material 3.5 yield temperature temperature at which the fusible material becomes sufficiently soft to activate the device and to permit discharge of the cylinder 4Marking If a stand-alone component, marking shall provide sufficient information to allow the following to be traced: a)the manufacturers or agents name, trademark or symbol; b)the fusible material yield temperature or PRD activation temperature (see annex A), and the rupture disc pressure rating, as appropriate. NOTEThis 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. 5Construction and assembly 5.1The PRD shall comply with the applicable provisions of ISO 15500-1 and ISO 15500-2, and with the tests specified in clause 6 of this part of ISO 15500. -,-,- ISO 15500-13:2001(E) © ISO 2001 All rights reserved3 5.2The PRD shall be suitable for the cylinder type and size used. The CNG cylinder and PRD system shall have been tested according to ISO 11439 to ensure suitability. 6Tests 6.1Applicability The tests required to be carried out are indicated in Table 1. Table 1 Tests applicable TestApplicableTest procedure as required by ISO 15500-2 Specific test requirements of this part of ISO 15500 Hydrostatic strengthXXX (see 6.2) LeakageXXX (see 6.3) Excess torque resistanceXX Bending moment Xa XX (see 6.4) Continued operationXXX (see 6.5) Corrosion resistanceXX Oxygen ageingXX Electrical overvoltages Non-metallic synthetic immersionXX Vibration resistanceXX Brass material compatibilityXX Accelerated lifeXX (see 6.6) Benchtop activationXX (see 6.7) Thermal cyclingXX (see 6.8) Condensate corrosion resistanceXX (see 6.9) Flow capacityXX (see 6.10) a This test is to confirm proper design and construction of stand-alone, externally threaded PRD designs and is not required if the PRD is internally imbedded in the valve body. 6.2Hydrostatic strength 6.2.1Housing The manufacturer shall either physically test the housing or prove its strength by calculation. The test shall be performed according to the procedure given in ISO 15500-2 using a pressure of 80 MPa (800 bar) at 20 °C?5 °C. 6.2.2Fusible material 6.2.2.1Test procedure Test the fusible material in the PRD with water at 30 MPa (300 bar) and 20 °C?5 °C for 30 min using the following procedure. ISO 15500-13:2001(E) 4© ISO 2001 All rights reserved a)Randomly select three test specimens. For combination relief devices, the burst disc shall not be removed. During the test, the fusible material shall not begin to extrude out of the PRD. b)Increase the pressure at a rate of 0,5 MPa/s (5 bar/s) to 60 MPa (600 bar), or to the pressure at which the fusible material starts to extrude. 6.2.2.2Requirement If the extrusion of the fusible material begins at less than 45 MPa (450 bar), the device is considered to have failed the test. 6.3Leakage Follow the procedure for testing leakage given in ISO 15500-2, using the test temperatures and pressures given in Table 2, below. The PRD shall be either bubble-free or have a leakage rate 75 % and 105 % of the activation pressure of a PRD not subjected to any previous testing. ISO 15500-13:2001(E) © ISO 2001 All rights reserved7 6.8Thermal cycling 6.8.1Test procedure Thermally cycle the PRD between?40 °C and 82 °C, as follows. a)Place a depressurized PRD in a fluid bath maintained at?40 °C or lower for a period of 2 h or more. Then transfer the device to a fluid bath maintained at 82 °C or higher within 5 min. b)Leave the depressurized PRD in the fluid bath maintained at 82 °C or higher for a period of 2 h or more. Then transfer the device to the fluid bath maintained at?40 °C or lower within 5 min. c)Repeat steps a) and b) until a total of 15 thermal cycles have been achieved. d)With the PRD conditioned for a period of 2 h or more in the?40 °C fluid bath, cycle the PRD between no more than 10 % and no less than 100 % of the service pressure for a total of 100 cycles. 6.8.2Requirement At the completion of the test, the PRD shall meet all the requirements of 6.3 and 6.7. 6.9Condensate corrosion resistance 6.9.1Test procedure a)Seal the outlet port of the PRD. b)Fill the PRD with the test solution given in 6.9.2 and soak the device for 100 h at 21 °C. c)Empty the solution from the PRD and reseal the outlet port, then heat the device for an additional 100 h at 82 °C. At the end of this test, the PRD shall meet all the requirements of 6.3 and 6.7. 6.9.2Test solution The test solution, by volume percentage, consists of ?84,8 % Stoddard solvent, ?10,0 % benzene, ?2,5 % fryquel no. 15 or no. 20 compressor oil, ?1,5 % water, ?1,0 % methanol, and ?0,2 % mercaptan. 6.10 Flow capacity 6.10.1 General 6.10.1.1Three random samples of the PRD shall be tested for flow capacity. Each device tested shall be caused to operate by temperature or a combination of temperature and pressure. -,-,- ISO 15500-13:2001(E) 8© ISO 2001 All rights reserved 6.10.1.2After activation, and without cleaning, removal of parts or reconditioning, each PRD shall be subjected to an actual flow test wherein the amount of air released by the device is measured. The rated flow capacity of the device shall be the average flow capacity of the three samples, provided the individual flow capacities fall within 10 % of the highest flow capacity recorded. 6.10.2 Test procedure a)Conduct flow testing with air at 0,8 MPa (8 bar) to 0,9 MPa (9 bar). b)Measure the temperature. c)Correct the calculation of flow rate to 0,7 MPa (7 bar) absolute and 15 °C. The PRD shall be tested to establish its flow capacity in m3/h (normal conditions) of natural gas flow with an accuracy of?10%. One acceptable method is to measure the temperature and pressure of a known volume of compressed air or gas, both before and after conducting a flow test, and measure the time during flow. 7Production batch inspection and acceptance testing The PRD manufacturer shall institute a production batch inspection and acceptance testing program that ensures consistent safety performance of the product. EXAMPLEANSI/IAS PRD1. ISO 15500-13:2001(E) © ISO 2001 All rights reserved9 Annex A (normative) Determination of fusible material yield temperature and PRD activation temperature A.1 General Clause 4 of this part of ISO 15500 gives PRD manufacturers a choice of marking their products with either the fusible material yield temperature or the PRD activation temperature see b). In A.2 and A.3 the methods are given for obtaining these values. A.2 Fusible material yield temperature A.2.1 Sample selection Select at random two samples of the fusible material from each batch (heat) in the manufactured form (e.g. ingot, wire). A.2.2 Test Setup For fusible material supplied in ingot form, two specimens, each 50 mm in length and approximately 6 mm in diameter, shall be taken from each ingot for test purposes. For fusible material supplied