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GB/T 26779-2021 PDF in English


GB/T 26779-2021 (GB/T26779-2021, GBT 26779-2021, GBT26779-2021)
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GB/T 26779-2021: PDF in English (GBT 26779-2021)

GB/T 26779-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.080.01
CCS T 47
Replacing GB/T 26779-2011
Hydrogen fuel cell electric vehicle refueling receptacle
ISSUED ON: MARCH 09, 2021
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Model ... 5 
5 Requirements ... 6 
5.1 General requirements... 6 
5.2 Performance requirements ... 6 
6 Test methods ... 8 
6.1 General ... 8 
6.2 Appearance and size inspection ... 8 
6.3 Air tightness test ... 8 
6.4 Vibration resistance test ... 8 
6.5 Temperature resistance test ... 9 
6.6 Durability test... 9 
6.7 Oxygen aging resistance test ... 9 
6.8 Ozone aging resistance test ... 9 
6.9 Compatibility test ... 9 
6.10 Hydrostatic pressure strength test ... 10 
6.11 Salt spray corrosion resistance test ... 10 
6.12 Temperature cycle resistance test ... 10 
6.13 Compatibility test ... 10 
7 Marks ... 11 
Annex A (normative) Receptacle structure type ... 12 
Annex B (informative) Antifreeze design of receptacle ... 15 
Hydrogen fuel cell electric vehicle refueling receptacle
1 Scope
This Standard specifies types, marks, requirements and test methods for
hydrogen fuel cell electric vehicle refueling receptacle.
This Standard is applicable to the hydrogen fuel cell electric vehicle refueling
receptacle that uses compressed hydrogen as working medium, the rated filling
pressure does not exceed 70MPa, the working temperature is -40°C~85°C.
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
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 1690-2010, Rubber, vulcanized or thermoplastic - Determination of the
effect of liquids
GB/T 10125, Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 24548, Fuel cell electric vehicles - Terminology
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T
24548 as well as the followings apply.
3.1 receptacle
a component assembly connected to the hydrogenation gun on the vehicle
3.2 nominal working pressure
in the standard state, the designed rated filling pressure
4 Model
The receptacle model consists of the following four parts:
After the temperature resistance test of the check valve of receptacle is
completed, carry out the durability test according to the method specified in 6.6.
There shall be no abnormal wear after the test. And it shall meet the
requirements for air tightness in 5.2.1 and the requirements for hydrostatic
strength in 5.2.8.
5.2.5 Oxygen aging resistance
For the seals in contact with hydrogen at the receptacle, carry out the oxygen
aging test according to the method specified in 6.7. There shall be no obvious
deformation, deterioration, spots, cracks and so on.
5.2.6 Ozone aging resistance
For the seals in contact with air at the receptacle, carry out the ozone aging
resistance test according to the method specified in 6.8. There shall be no
obvious deformation, deterioration, spots, cracks and so on.
5.2.7 Compatibility
For the non-metal parts in contact with hydrogen at the receptacle, carry out
the compatibility test according to the method specified in 6.9. Its volume
expansion rate shall not be greater than 25%. The volume shrinkage rate shall
not be greater than 1%. The mass loss rate shall not be greater than 10%.
5.2.8 Hydrostatic strength
The pressure-bearing parts of the receptacle shall be subjected to the
hydrostatic strength test according to the method specified in 6.10. There shall
be no cracks or permanent deformation.
5.2.9 Salt spray corrosion resistance
Test according to the method specified in 6.11. The receptacle shall not show
signs of corrosion or peeling off the protective layer. The receptacle shall meet
the air tightness requirements specified in 5.2.1.
5.2.10 Temperature cycle resistance
Test according to the method specified in 6.12. The gas pressure in the test
shall not be lower than 70% of the nominal working pressure. After the test, the
receptacle shall meet the air tightness requirements specified in 5.2.1 and the
hydrostatic strength requirements specified in 5.2.8.
5.2.11 Compatibility
Only the receptacle with a nominal working pressure of 70MPa needs to be
tested for compatibility. Carry out the compatibility test according to the method
If the receptacle is a symmetrical structure, it can only do vibration test in one
direction. If the receptacle is not symmetrical, vibration tests shall be carried out
in two directions perpendicular to each other, in no particular order.
6.5 Temperature resistance test
The check valve of the receptacle is closed. Fill the outlet end of the receptacle
with a leak detection gas whose pressure is the nominal working pressure. Put
it in an incubator. The temperature rises from room temperature to 85°C±2°C.
Keep the temperature for 8h. Immerse in 85°C water for 1min. Record whether
there are bubbles. Keep the temperature for 0.5h after returning to room
temperature. Continue to cool down to -40°C±2°C. Keep the temperature for
8h. Immerse in the cooling liquid at -40°C for 1min. Record whether there are
bubbles.
6.6 Durability test
The durability test is carried out according to the following steps. The total
number of cycles is 15000.
a) The outlet end of the receptacle is closed. The inlet end is accessed with
high-pressure gas source. The test pressure increased from 0MPa to 1.25
times the nominal working pressure. Make the check valve open.
b) The pressure relief at the inlet end is 0MPa. Make the check valve
withstand 1.25 times the nominal working pressure and be in a closed
state. Keep the time not less than 2s. Relieve the pressure at the outlet
end to 0MPa~0.5MPa.
The check valve opens and closes once as a cycle. The opening and closing
frequency of the check valve is not higher than 15 times/min.
6.7 Oxygen aging resistance test
The seals in contact with hydrogen at the receptacle shall be placed in oxygen
at a temperature of 70°C±2°C and a pressure of 2MPa for 96h. Observe the
changing state.
6.8 Ozone aging resistance test
The seals in contact with air at the receptacle shall be placed in the air at a
temperature of 40°C±2°C and an ozone volume fraction of 5×10-7 for 120h.
Observe the changing state.
6.9 Compatibility test
After the non-metal parts in contact with hydrogen at the receptacle shall be
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.