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GB/T 43408-2023: Road vehicles - Compressed natural gas (CNG) refuelling connector Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 43408-2023: Road vehicles - Compressed natural gas (CNG) refuelling connector---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT43408-2023GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 43.020 CCS T 40 Road Vehicles - Compressed Natural Gas (CNG) Refueling Connector (ISO 14469:2017, MOD) ISSUED ON: NOVEMBER 27, 2023 IMPLEMENTED ON: MARCH 1, 2024 Issued by: State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 5 2 Normative References ... 5 3 Terms and Definitions ... 5 4 General Structural Requirements ... 6 5 Refueling Nozzle ... 7 6 Dimensions of Standard Refueling Receptacles ... 9 7 Refueling Receptacle ... 10 8 Instructions ... 11 9 Markings ... 11 10 Test Methods ... 12 Appendix A (informative) Comparison of Structure No. and Figure No... 26 Appendix B (normative) Characteristics of Refueling Nozzle ... 32 Appendix C (normative) Refueling Receptacle Test Fixture ... 33 Bibliography ... 35 Road Vehicles - Compressed Natural Gas (CNG) Refueling Connector1 ScopeThis document specifies the general structure, instructions and marking requirements for CNG vehicle refueling connectors, and describes the test methods. This document only applies to CNG vehicles with a service pressure of 20 MPa. NOTE: unless otherwise stated, all pressures in MPa are gauge pressures.2 Normative ReferencesThe contents of the following documents constitute indispensable clauses of this document through the normative references in the text. In terms of references with a specified date, only versions with a specified date are applicable to this document. In terms of references without a specified date, the latest version (including all the modifications) is applicable to this document. GB/T 1690 Rubber, Vulcanized or Thermoplastic - Determination of the Effect of Liquids (GB/T 1690-2010, ISO 1817:2005, MOD) GB/T 3512 Rubber, Vulcanized or Thermoplastic - Accelerated Ageing and Heat Resistance Tests - Air-oven Method (GB/T 3512-2014, ISO 188:2011, IDT) GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests (GB/T 10125-2021, ISO 9227:2017, MOD) ISO 15500-2 Road Vehicles - Compressed Natural Gas (CNG) Fuel Systems Components - Part 2: Performance and General Test Methods ISO 15501-1 Road Vehicles - Compressed Natural Gas (CNG) Fuel Systems - Part 1: Safety Requirements3 Terms and DefinitionsThe following terms and definitions are applicable to this document. 3.1 dry air Air with a dew point temperature at the test pressure that is at least 11 C lower than the ambient test temperature. compatible with CNG within the working pressure and temperature range and shall not have any effect. The working temperature is selected by the manufacturer based on the following temperature ranges: ---40 C ~ 85 C or 40 C ~ 120 C (if applicable); ---20 C ~ 85 C or 20 C ~ 120 C (if applicable). NOTE 1: the lower limit temperature depends on whether the component is used in mild or cold weather. NOTE 2: the upper limit temperature depends on whether the component is installed inside the engine compartment (120 C) or outside the engine compartment (85 C). 4.5 If the material of the CNG refueling nozzle and refueling receptacle is brass, the copper content shall be less than or equal to 70%, so as to ensure compatibility with natural gas and shall not have any effect. 4.6 The external three-way valves shall be clearly marked to indicate the open, closed and venting positions. 4.7 No tools shall be used to connect or disconnect the CNG refueling nozzle and refueling receptacle. 4.8 The refueling receptacle shall be installed on the vehicle in accordance with the requirements of ISO 15501-1. 4.9 The connecting components shall have good airtightness and shall not leak.5 Refueling Nozzle5.1 Types of Refueling Nozzle 5.1.1 The characteristics of the refueling nozzle shall comply with the requirements of Appendix B. Refueling nozzles are divided into the following three types. a) Type-1 refueling nozzle is applicable to devices where the hose is under high pressure after the gas dispenser is turned off. This type of refueling nozzle shall be equipped with an integrated valve or multiple valves. By closing the valve, gas refueling shall be stopped, and the remaining gas in the refueling nozzle shall be safely evacuated, then, the refueling nozzle is allowed to be disconnected from the refueling receptacle. Its operating mechanism shall ensure that the exhaust valve is opened before the evacuation action, and the gas between the refueling nozzle stop valve and the refueling receptacle needle valve has been safely discharged before removing the refueling nozzle (see 10.2). b) Type-2 refueling nozzle is applicable to devices where the hose is under high pressure after the gas dispenser is turned off. This type of refueling nozzle shall have a direct or indirect independent three-way valve in front of the air inlet, through which, the remaining gas in the refueling nozzle can be safely evacuated before removing the refueling nozzle. Gas refueling can only be performed when the refueling nozzle and refueling receptacle are correctly corrected. Before removing the refueling nozzle, deflate first (see 10.2). c) Type-3 refueling nozzle is applicable to devices where the refueling hose has automatic pressure relief (less or equal to 0.5MPa) after the gas dispenser is turned off (see 10.2). 5.1.2 In accordance with cycle life, the refueling nozzles are divided into the following two types: ---Type A: high-frequency use type, whose cycle life should be no less than 100,000 times; ---Type B: low-frequency use type, whose cycle life should be no less than 20,000 times. 5.2 Before disconnecting, all types of refueling nozzles shall be exhausted or depressurized. The disconnection of all refueling nozzles shall comply with the stipulations of 10.2. 5.3 The sealed connection between the refueling nozzle and the refueling hose shall not rely solely on threads (for example, tapered threads). 5.4 The three-way valve exhaust port of Type-1 and Type-2 refueling nozzles shall be protected, so as to prevent foreign matters and fluids from entering and affecting the normal operation of the three-way valve. 5.5 The parts on the refueling nozzle that operate the connection or disconnection may be made of thermally insulating materials. 5.6 If Type-1 refueling nozzle contains a rotating mechanism, there shall be “open” and “closed” marks that permanently identify the direction of operation. 5.7 The surface hardness of the contact surface between the refueling nozzle and the refueling receptacle is greater than 75 HRB and shall be made of non-sparking and conductive materials (see 10.11.5 and 10.15). The outer surface of the refueling nozzle shall be made of non-sparking materials (see 10.11.5 and 10.15). 5.8 The refueling nozzle shall comply with the stipulations of Chapter 10, so as to ensure interchangeability. c) B200; d) Applicable types and categories (see 5.1); e) Working temperature range. 9.3 The refueling nozzle and refueling receptacle shall be marked with a manufacturing date code. 9.4 Each system shall have identification consistent with this document, which may be located on the equipment, on the packaging, or in the documentation included in the equipment’s exit- factory packaging.10 Test Methods10.1 General Requirements 10.1.1 The refueling nozzle and refueling receptacle under test shall comply with the stipulations of this document. The test shall be carried out under the following conditions: a) The test shall be conducted at an ambient temperature of 20 C 5 C; b) All pressure or leakage test media shall be dry air or dry nitrogen; c) The device shall be adjusted to a balanced state. The maximum deviation of all pressures and dimensions shall be 5%. 10.1.2 Adopt Type-2 refueling nozzles that use a three-way valve or other modes for independent pressurization and exhaustion for continuous tests. The three-way valve shall not affect the temperature, durability and flow characteristics of the refueling nozzle. The failure of the three-way valve shall not be regarded as a fault of the refueling nozzle. The three-way valve used together with Type-2 refueling nozzles shall be separately evaluated. 10.1.3 The refueling nozzles shall be tested using a test fixture, see Appendix C. A new refueling nozzle test sample shall be used for each refueling nozzle test. Any test failure of the refueling receptacle and refueling nozzle is deemed to be a design failure of the refueling nozzle. 10.2 Connect and Disconnect Operations 10.2.1 General requirements 10.2.1.1 The appearance of the refueling nozzle and refueling receptacle shall clearly indicate the correct method of operation. 10.2.1.2 Type-1 refueling nozzles and refueling receptacles shall be correctly connected and reliably locked before gas can be transported. 10.2.2 Pressurization test 10.2.2.1 When disconnected, Type-1, Type-2 and Type-3 refueling nozzles shall stop refueling gas. During the test, the internal pressure of Type-3 refueling nozzles shall be less than or equal to 0.7 MPa. 10.2.2.2 When the pressure inside the nozzle is less than or equal to 0.7 MPa, the disassembly force of all refueling nozzles shall be less than or equal to 225 N, or the disassembly torque shall be less than or equal to 7 N m. 10.2.2.3 When removing the refueling nozzle, apply force and torque towards the direction of unloading the nozzle. The force / torque shall be applied to the locking structure. The torque shall be applied by rotating the axis of the handle of the refueling nozzle, which is equivalent to operating on the outer surface of the refueling nozzle separation device, and its direction shall make it easy to disengage and release the refueling nozzle. 10.2.3 No-pressure test 10.2.3.1 When the connector is not pressurized, the axial force used to lock or unlock the connection shall be less than or equal to 90 N. 10.2.3.2 On locking devices containing a rotary locking mechanism, for devices with a diameter less than or equal to 25.4 mm, the torque for locking or unlocking the rotary locking mechanism shall be less than or equal to 1 N m; for devices with a diameter greater than 25.4 mm, the torque shall be less than or equal to 1.7 N m. 10.2.3.3 When the pressure is greater than or equal to 6.25 MPa, the minimum force for the disconnection of Type-1 and Type-2 refueling nozzles shall be greater than 2.5 times the test value when not pressurized; the minimum force for the disconnection of Type-3 refueling nozzles shall be greater than 2.5 times the test value under the pressure of 0.7 MPa. Type-1 refueling nozzles shall be tested with the vent hole blocked. 10.3 Drop Test The drop test shall be carried out in accordance with the following method: a) The refueling nozzle is connected to a refueling hose with a length of 4.6 m and an inner diameter of 9.5 mm, and is placed at a temperature less than or equal to 40 C for 24 hours; b) Drop it from 1.8 m to the concrete floor, as shown in Figure 3; c) Drop the refueling nozzle for 10 times, then pressurize it to the service pressure and drop it 10 times again. After the test, the refueling nozzle shall be normally connected and disconnected from the refueling receptacle and shall comply with the stipulations of 10.5. 10.5.1.3 If there are no bubbles within 1 minute, then, the sample passes the test. If bubbles are detected, the leakage rate shall be measured using a helium vacuum test (bulk accumulation method) or an equivalent method. 10.5.2 Refueling receptacle 10.5.2.1 When testing in accordance with the following method, the one-way valve at the refueling receptacle shall remain bubble-free for 1 minute, or its leakage rate shall be less than 20 cm3/h (standard state). 10.5.2.2 The test shall be carried out first at 0.5 MPa, then, at 1.5 times the service pressure, and finally at 0.5 MPa. 10.5.2.3 The refueling receptacle shall be connected to a pressure vessel that can safely withstand the specified test pressure. The refueling receptacle and pressure vessel shall be pressurized. Once the pressure vessel reaches the specified test pressure, the gas supply end of the refueling receptacle shall be rapidly decompressed and the one-way valve of the refueling receptacle shall be checked for leakage. 10.6 Operating Handle of the Valve on the Refueling Nozzle 10.6.1 If the refueling nozzle is equipped with a valve operating handle, it shall withstand twice the operating torque or force specified by the manufacturer, without damaging the operating handle or operating limit block. 10.6.2 The operating handle shall apply torque or force in the opening and closing directions and be tested in accordance with the following methods: a) The refueling nozzle shall be correctly connected to the refueling receptacle; b) The refueling nozzle is connected to the refueling receptacle intentionally misaligned. 10.7 Abnormal Load 10.7.1 General requirements 10.7.1.1 The connected refueling nozzle and refueling receptacle shall withstand the abnormal load test for 5 minutes, and the tests shall be respectively carried out in accordance with the following methods: a) The applied force a along the axial direction of the refueling nozzle or refueling receptacle; b) The applied torque b along the direction perpendicular to the axis of the refueling nozzle (as shown in Figure 4). 10.7.1.2 The refueling nozzle and refueling receptacle shall withstand the abnormal load of a = 1,350 N and b = 120 N m, without deformation or damage; they shall withstand the abnormal times the service pressure during the test. 10.7.3.2 Regardless of the service pressure of the refueling nozzle, the test device of the refueling receptacle used for the test shall adopt a “loose fit”, and the fitting dimensions are shown in Figure C.1. The supporting elements shall be able to withstand the specified load without displacement or deflection, so as to satisfy the requirements of the test. The refueling nozzle shall be correctly connected to the test device. 10.7.3.3 The applied load and the damage resistance of the device shall comply with the stipulations of 10.7.1. After the test is completed, the refueling receptacle shall comply with the stipulations of 10.5. 10.8 Mobility Test 10.8.1 When carrying out the test in accordance with the following method, the refueling receptacle and its connecting components shall not be loose or damaged. 10.8.2 The refueling receptacle shall be installed on the supporting elements using the refueling receptacle connection components and installation requirements provided by the manufacturer. The supporting elements shall be able to withstand the specified load without displacement or deflection. A refueling nozzle equipped with a pressurized hose shall be able to be connected to the refueling receptacle. At a position where the refueling nozzle is far away from the refueling receptacle, apply a positive and negative torque of 24 N m, lasting 2,500 times, with a frequency not exceeding one cycle per second. 10.8.3 Then, in the direction where the connection components are likely to loosen, apply a torque of 4 N m to the refueling receptacle for 10 times. 10.8.4 After the test, the refueling receptacle shall comply with the stipulations of 10.5. After the room-temperature leakage test, the refueling receptacle shall comply with the stipulations of 10.12. 10.9 Torque Test of Connection Components The refueling receptacle and connection components shall be able to withstand 1.5 times the torque recommended by the manufacturer without damage. 10.10 Low-temperature and High-temperature Tests 10.10.1 General requirements Before pre-treatment, the equipment shall be firstly purged with nitrogen, then, isolated from the atmosphere under a pressure of 7 MPa nitrogen or dry air. All tests shall be carried out with the test device continuously at the specified test temperature. The outlet of the test device shall be blocked, and test pressure shall be applied to the inlet of the test device. When carrying out a leakage test within the specified time, the sample piece shall be free of bubbles, or the leakage rate shall be less than 20 cm3/h (standard state). 10.10.2 Leakage test 10.10.2.1 Pre-treatment Place the test device in accordance with the following test temperature conditions for 2 hours, then, carry out the test in accordance with 10.10.2.2: a) The refueling nozzle and the refueling receptacle are connected, at a temperature of 40 C (20 C, if applicable) or lower, respectively pressurize to 0.5 MPa and 15 MPa; b) The refueling nozzle and the refueling receptacle are connected, at a temperature of 85 C (or 120 C, if applicable) or higher, respectively pressurize to 1 MPa and 1.5 times the service pressure; c) The refueling receptacle is not connected, at a temperature of 40 C (20 C, if applicable) or lower, respectively pressurize to 0.5 MPa and 15 MPa; d) The refueling receptacle is not connected, at a temperature of 85 C (or 120 C, if applicable) or higher, respectively pressurize to 1 MPa and 1.5 times the service pressure; e) The refueling nozzle is not connected, at a temperature of 40 C (20 C, if applicable) or lower, respectively pressurize to 0.5 MPa and 15 MPa; f) The refueling nozzle is not connected, at a temperature of 85 C (or 120 C, if applicable) or higher, respectively pressurize to 1 MPa and 1.5 times the service pressure. 10.10.2.2 Test The test specimen shall be filled with compressed air or nitrogen. Use the following methods to check for leakage: a) At a temperature of 40 C (or 20 C, if applicable), immerse the test specimen in a mixture of 70% ethylene glycol and 30% water, and maintain it for 2 minutes; b) Under the temperature condition of 85 C, immerse the test specimen in 85 C water (no more than 30% ethylene glycol is allowed), and maintain for 1 minute; c) At a temperature of 120 C (if applicable), immerse the test specimen in synthetic oil and maintain for 1 minute. The temperature of the medium used to immerse the test sample should be consistent with the temperature of the test specimen. 10.10.2.3 Requirements to oxidative aging. Otherwise, after carrying out the oxidative aging resistance test in accordance with the following requirements, the sealing materials shall not manifest cracking or visible signs of deterioration. 10.11.2.2 The sample shall be exposed for 96 hours at a temperature of 70 C 5 C and a pressure of 2.1 MPa 0.1 MPa. 10.11.2.3 The test shall be carried out in accordance with the stipulations of GB/T 3512. 10.11.3 Sealing materials compatibility test After carrying out the test in accordance with the following method, the sealing materials shall not show excessive volume changes or mass losses. a) Representative sealing materials shall be selected as samples, measured and weighed. Immerse the sample in natural gas at 1.25 times the service pressure for at least 70 hours; thereafter, the test pressure shall be rapidly reduced to atmospheric pressure. The samples shall not show signs of fragmentation, the expansion rate of the samples shall be less than or equal to 25%, and the shrinkage rate shall be less than or equal to 1%. Quality loss is less than or equal to 10%. The samples shall be observed, measured and weighed within 1 hour after the test. b) Non-metallic materials that may come into contact with easter-based or -olefin- based synthetic compressor oil (including non-synthetic compressor oil) shall be tested in accordance with GB/T 1690 or the following steps. After the test, there shall be no excessive volume changes or mass losses. For each non-metallic material, one or more representative sealing materials shall be selected as samples, measured and weighed. At room temperature, soak the samples onto the holder in each test solution for greater than or equal to 70 hours. Thereafter, within 1 hour, take out and measure the test samples. The expansion rate of the samples shall be less than or equal to 25%, and the shrinkage rate shall be less than or equal to 1%. The mass loss shall be less than or equal to 10%. 10.11.4 Stress corrosion resistance test 10.11.4.1 After carrying out the test in accordance with the following method, brass parts with a zinc content greater than or equal to 15% are examined with a 25 magnifying glass, and there shall be no signs of cracks or delamination. 10.11.4.2 As a result of being assembled with other components, the samples shall withstand the stress normally exerted on or within the parts. The stress shall be maintained before and during the test. If threaded samples are used for on-the-site installation, the threads shall be engaged and tightened to the torque specified by the manufacturer. Polytetrafluoroethylene (PTFE) tape or composite pipe shall not be used on the threads. 10.11.4.3 The three samples shall be degreased first, then, placed in a glass container with a temperature of 34 C 2 C under atmospheric pressure, a volume of 3 L, and filled with 0.6 L of wet ammonia mixture with a specific gravity of about 0.94. An inert pallet shall be used to support it 40 mm above the ammonia solution and place it for 10 days. 10.11.5 Resistance test Under pressurized and unpressurized conditions, the resistance of the refueling receptacle and refueling nozzle connecting parts shall be less than or equal to 10 . The test shall be carried out before and after the durability cycle (see 10.11.1). 10.12 Hydrostatic pressure strength test 10.12.1 WARNING: the hydrostatic pressure strength test is the final test, and the samples shall not be used for any other tests after this test. 10.12.2 When the test is carried out in accordance with the following method, the unconnected refueling nozzle, unconnected refueling receptacle and the refueling connector shall not appear cracked. 10.12.3 The outlet side of the unconnected or connected sample piece shall be blocked, and the valve seat or internal valve block shall be in the open position. 2.5 times the service pressure shall be applied to the inlet of the refueling nozzle or the outlet of the refueling receptacle and maintained for at least 3 minutes. 10.13 Corrosion Resistance Test 10.13.1 General requirements The refueling nozzle and refueling receptacle shall not corrode or lose their protective layer and shall safely operate after the test. Brand-new samples shall be used for the test. The protective cap shall be installed in place and the exhaust hole shall not be blocked. 10.13.2 Refueling nozzle 10.13.2.1 The test piece shall be horizontally placed. In accordance with the stipulations of GB/T 10125, it shall be exposed to salt spray for 96 hours. 10.13.2.2 During the entire test process, the temperature inside the salt spray box shall be maintained at 33 C ~ 36 C. The salt spray solution shall consist of 5% sodium chloride and 95% distilled water. 10.13.2.3 Continuously introduce 0.5 MPa air at the inlet of the refueling nozzle. Within 8 hours of starting the test, the refueling nozzle shall be opened once an hour to release air into the atmosphere through the refueling receptacle. 10.13.2.4 After cleaning the refueling nozzle and gently removing the salt layer, the refueling nozzle shall comply with the stipulations of 10.5. 10.13.3 Refueling receptacle ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 43408-2023 be delivered?Answer: The full copy PDF of English version of GB/T 43408-2023 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 43408-2023_English with my colleagues?Answer: Yes. 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