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GB/T 34425-2017 English PDF (GBT34425-2017)

GB/T 34425-2017 English PDF (GBT34425-2017)

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GB/T 34425-2017: Fuel cell electric vehicles -- Hydrogen refuelling nozzle

This Standard specifies the definitions, requirements, and test methods of fuel cell electric vehicles - hydrogen refuelling nozzle. This Standard is applicable to fuel cell electric vehicles - hydrogen refuelling nozzle which uses compressed hydrogen as working medium, of which the working pressure is not more than 35 MPa and the operating ambient temperature is -40 degree-Celsius~60 degree-Celsius.
GB/T 34425-2017
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 43.080.01
T 47
Fuel cell electric vehicles - Hydrogen refuelling nozzle
ISSUED ON. OCTOBER 14, 2017
IMPLEMENTED ON. MAY 1, 2018
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope .. 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Requirements ... 5
5 Test methods .. 9
Fuel cell electric vehicles - Hydrogen refuelling nozzle
1 Scope
This Standard specifies the definitions, requirements, and test methods of fuel cell electric vehicles - hydrogen refuelling nozzle.
This Standard is applicable to fuel cell electric vehicles - hydrogen refuelling nozzle which uses compressed hydrogen as working medium, of which the
working pressure is not more than 35 MPa and the operating ambient
temperature is -40 ??C~60 ??C.
2 Normative references
The following documents are essential to the application of this document. For the dated references, only the versions with the dates indicated are applicable to this document. For the undated references, the latest version (including all the amendments) are applicable to this document.
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests GB/T 24548 Fuel cell electric vehicles - Terminology
GB/T 24549-2009 Fuel cell electric vehicles - Safety requirements
GB/T 26779-2011 Fuel cell electric vehicles - Refuelling receptacle
3 Terms and definitions
The following terms and definitions as defined by GB/T 24548 and GB/T 26779 are applicable to this document.
3.1 Hydrogen refuelling nozzle
The refuelling nozzle which is installed at the end of hydrogen refuelling hose of hydrogen dispenser for connecting the hydrogen dispenser with the vehicle. 3.2 Receptacle
When refuelling, the sum of parts by which the vehicle is connected to the hydrogen refuelling nozzle.
3.3 Connector
nozzle, the gas between the stop valve of hydrogen refuelling nozzle and the needle valve of receptacle is safely discharged.
b) B-type. This type of hydrogen refuelling nozzle is applicable to the device where the refuelling hose is in high-pressure state after the hydrogen
dispenser is closed. A separate three-way valve is installed directly or indirectly before the gas inlet of this type of hydrogen refuelling nozzle. Through the valve, before unloading the hydrogen refuelling nozzle, the residual gas in the nozzle head is safely bled. Only when the hydrogen
refuelling nozzle and the receptacle are connected correctly, can the
hydrogen be refuelled. Before unloading the hydrogen refuelling nozzle, it shall bleed the gas first. There shall be marks indicating the position of opening, closing, and bleeding gas on the external three-way valve.
c) C-type. This type of hydrogen refuelling nozzle is applicable to the device where the refuelling hose is depressurized (less than or equal to 0.5 MPa) after the hydrogen dispenser is closed. Only when the hydrogen refuelling nozzle and the receptacle are connected correctly, can the hydrogen be
refuelled. Through receiving the signal of correct connection from the
hydrogen refuelling nozzle, the hydrogen dispenser can control related
functions.
4.1.5 The connection between the hydrogen refuelling nozzle and the hose of hydrogen dispenser shall not rely solely on thread sealing.
4.1.6 A-type hydrogen refuelling nozzle shall have integrated or permanent marks, which indicate the direction of ?€?on?€? and ?€?off?€? operations at startup. 4.1.7 The hydrogen refuelling nozzle shall have filter and other protective measures to prevent the upstream solid matter from entering.
4.1.8 The hydrogen refuelling nozzle shall, in the range of atmospheric ambient temperature of -40 ??C~60 ??C and the range of hydrogen ambient temperature of -40 ??C~85 ??C, work normally.
4.1.9 The hydrogen refuelling nozzle shall not, by mechanical method, open the one-way valve of receptacle.
4.2 Performance requirements
4.2.1 Gas tightness
According to the method stipulated in 5.3, CARRY out gas-tightness test; at 20 ??C and 101 MPa, the leakage rate of unconnected hydrogen refuelling
nozzle shall be less than 20 cm3/h. At 20 ??C and 101 MPa, the leakage rate of pressure, shall be checked, to ensure that it is correctly applied to the hydrogen refuelling nozzle.
b) Connector - The connector between the hydrogen refuelling nozzle and the receptacle shall be capable of withstanding the working condition of maximum airflow. After the test, the hydrogen refuelling nozzle or the
receptacle shall meet the requirements of 4.2.1.
4.2.8.2 Aerotolerance aging test
According to the method specified in 5.10.2, CARRY out aerotolerance aging test on sealing materials; there shall be no fracture or visible damage. 4.2.8.3 Immersion for non-metallic materials
According to the method specified in 5.10.3, CARRY out immersion test on the non-metallic materials in the hydrogen refuelling nozzle which directly contact with hydrogen. The expansion of the sample shall not exceed 25%; the
contraction shall not exceed 10%; and the weight loss shall not exceed 10%. 4.2.8.4 Resistance of connecting parts to the receptacle
According to the method specified in 5.10.4, under pressure or non-pressure, the resistance of connecting parts between the receptacle and the hydrogen refuelling nozzle shall not be more than 1000 ??. Before and after the life cycle test, resistance test shall be carried out.
4.2.9 Strength of hydrostatic pressure
According to the method specified in 5.11, CARRY out the test. The test for strength of hydrostatic pressure is the final test; after which the sample shall not be used for any other tests.
When carrying out the following tests, there shall be no leakage in unconnected and connected hydrogen refuelling nozzle and receptacle.
4.2.10 Materials
The manufacturer shall list out the sealing materials and shall demonstrate that they meet the requirements of 4.2.8.2 and 4.2.8.3.
4.2.11 Resistance to corrosion
According to the method specified in 5.12, CARRY out the test; the hydrogen refuelling nozzle shall be free from corrosion or absence of protective coating, and shall show good safety.
It shall, in accordance with the ?€?loose fit?€? test device as shown in Figure 3 and 4, carry out the test. The test equipment shall be provided with a cantilever attached to the supporting element. The supporting element shall be able to withstand specified load without displacement or deflection. The hydrogen refuelling nozzle shall be correctly connected to the test equipment.
5.7 Swing/warp
USE the assembly parts for receptacle provided by the manufacturer to,
according to the specification, INSTALL the receptacle to the supporting element. To facilitate the test, the supporting element shall be able to withstand specified load without displacement or deflection. The hydrogen refuelling nozzle fitted to the pressure hose for normal use shall be properly connected to the receptacle. Two equal but reverse moments of force (value. 24 N??m) shall be cyclically and alternately applied to the point farthest from the receptacle on the hydrogen refuelling nozzle. Each load, at one frequency, shall be performed 2500 times. But per second, it shall not be more than one cycle.
In the direction in which the connecting parts are most likely to be loose, it shall apply a torque of 4 N??m for 10 times.
5.8 Torque for connecting parts
TEST the hydrogen refuelling nozzle and connecting parts which withstand 1.5 times the warping force of mounting torque.
5.9 Low and high temperature
Before the operation, the equipment shall be blown, cleaned, and sealed. The pressure of the internal leakage test gas is 7 MPa.
Only when the equipment is continuously placed at a specified test temperature, can all tests be conducted. PLUG the outlet of the equipment with a plug; then at the inlet of the equipment, APPLY test pressure.
Respectively FILL the hydrogen refuelling nozzle, receptacle, and connecting parts with 35 MPa compressed air or nitrogen; PUT them in a thermostat. The temperature gradually rises from room temperature to 60 ??C??2 ??C, and is maintained for 8 h. Then, TAKE them out and COOL them in the air to room temperature, and PUT them in a cryogenic box; the temperature gradually drops to -40 ??C??2 ??C, and is maintained for 8 h. Finally, TAKE them out, after rising to room temperature, CARRY out gas-tightness test.
At -40 ??C, when pressurizing to the maximum working pressure, the hydrogen refuelling nozzle and the receptacle are connected and disconnected for 10 times. At 60 ??C, when pressurizing to the maximum working pressure, the h...

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