GB/T 18363-2017Filling receptacle of CNG vehicle (English PDF)

3.1 Receptacle

The part that connects the filling receptacle and filling gun.

3.2 Protective cap

5.2.5 Oxidative aging resistance

After the non-metallic parts of the filling receptacle goes through the oxidative aging resistance test as per the test method stipulated in 6.7, it shall be free of deformation, cracks, deterioration, spots, and the like phenomena.

5.2.6 Compatibility

After the non-metallic parts of the filling receptacle performs the compatibility test as per the test method stipulated in 6.8, it shall be free of cracks, breakage; the material's volume expansion rate shall be <=25%, the shrinkage rate shall be <=1%, while the quality change shall be <=10%.

5.2.7 Corrosion resistance

5.2.7.1 After the brass pressure-bearing parts with zinc content >=15% performs the corrosion resistance test as per the test method stipulated in 6.9.1, use 25X magnifier to inspect, the components shall have no cracks.

5.2.7.2 After the filling receptacle finishes the salt spray test as per the test method stipulated in 6.9.2, it shall meet the requirements of 5.2.2.

6.1 General rules

6.1.1 Test conditions

Unless otherwise is specified, the test shall be performed under the following conditions.

a) The test environment temperature shall be 15°C~35°C;

b) The test medium shall be clean dry air or nitrogen.

6.1.2 Requirements for test instrument

Unless otherwise is specified, the test instrument shall meet the following requirements.

a) Pressure meter. the accuracy is no less than Level-1.5; the measuring range is 1.5~3 times of the measuring value. […]

6.5 Anti-impact load test of protective cap

The protective cap is installed on the fixed receptacle; then the steel ball with diameter of 50mm, mass of 0.5kg drops from the height of 0.3m and impacts on the most vulnerable part of the protective cap.

6.6 Durability test of one-way valve

Unless otherwise is specified, new test pieces shall be used for each of the following tests.

a) 30000 times of working cycle test.

The inlet end of the filling receptacle is connected to the high-pressure gas source; test pressure is increased from 0MPa to 22MPa; so that the one-way valve is in the opened state. Then the inlet end shall relieve the pressure to 0MPa; so that the one-way valve bears the 22MPa pressure and in the closed state; maintain for at least 2s; then the outlet end shall relieve the pressure to 0MPa.

Repeat the cycle in such a method, so the one-way valve periodically opens and closes. The opening-closing cycle frequency shall be no greater than 15times/min. The total number of cycle tests is 30000 times.

b) 24h flutter test Make the one-way valve reach the most severe flutter state through adjusting the flow rate of one-way valve, then maintain for 24h.

c) Full flow impact test The starting pressure of the air supply on the inlet shall be 22MPa, the outlet flow is not limited, the duration for each impact is no less than 2s; the air supply pressure shall be no less than 16MPa when the impact is finished; then relieve the inlet pressure, so that the one-way valve shall be closed. Perform 30 times continuous impact tests.

6.7 Oxidative aging resistance test

The non-metallic parts of the filling receptacle in contact with the natural gas shall be placed in the oxygen for 96h at a pressure of 2.0MPa, temperature of 70°C±2°C.

6.8 Compatibility test

Immerse the non-metallic parts of the filling receptacle in contact with natural gas into the specified medium for 70h at the temperature of 23°C±2°C; when the medium is […]

8.1 Marking

The filling receptacle product shall have the following permanent markings.

a) Model and specification of filling receptacle;

b) Manufacturer's name and logo;

c) Production lot number and date.

8.2 Package

8.2.1 The product shall be clean and intact before packaging.

8.2.2 The package bags (or boxes) shall prevent the ingress of corrosive medium AND prevent the damage to the product during the transporting period.

8.2.3 The outer package shall have the following markings.

a) Manufacturer name;

b) Product model and number;

c) Quantity and quality;

d) Exit-factory date;

e) Appearance dimension (L×W×H);

f) Handling precautions.

8.2.4 The package shall be accompanied by product certificate, product instructions, and necessary packing list.

8.3 Transportation and Storage

8.3.1 The product shall be handled with care during the transporting process, prevent the heavy pressure and collision; strictly prohibit the rain and chemical corrosion.

8.3.2 The product shall be stored in the ventilated, dry and clean room. […]