GB/T 33625-2017Oil-free reciprocating air compressors on locomotives and power cars (English PDF)

3.1 General requirements

3.1.1 Air compressors shall comply with this Standard; they shall be manufactured in accordance with the drawings and technical documents which are approved through specified procedures.

3.1.2 Specified operating conditions of air compressors a) suction pressure. 0.1 MPa (absolute pressure);

b) suction temperature. 20°C;

c) suction relative humidity. 0;

d) rated discharge pressure. 0.8 MPa;

e) operating voltage. DC 110 V;

f) rotational speed. as specified in the product technical documents, expressed in r/min.

3.1.3 Air compressors shall be capable of operating normally under the following service environmental conditions.

a) the altitude not more than 2 500 m;

4.2 Environment adaptation

4.2.1 High-temperature test

4.2.1.1 After storing air compressors for 2 h under the environmental conditions of 40°C, start the machine for continuous operation for 2 h. the operating voltage during operation is DC 110 V and the discharge pressure is the rated discharge pressure.

Measure the discharge temperature of air compressors at this moment, which shall be as specified in this Standard.

4.2.1.2 Install the air compressors under the environmental conditions of 70°C which are installed inside the car body in actual use or install the air compressors under the environmental conditions of 50°C which are installed inside the car body; store for 2 h; start the machine to run continuously for 10 min. the operating voltage during operating is DC 110 V and the discharge pressure is the rated discharge pressure. Measure the discharge temperature of air compressors at this moment, which shall be as specified in this Standard.

4.2.2 Low-temperature test

After storing air compressors for 2 h under the environmental conditions of - 40°C, air compressors shall be capable of being started normally under the operating voltage of DC 77 V and operating continuously for 1 h under the rated discharge pressure.

4.2.3 High-altitude test

The test shall be conducted in areas of altitude 2 500 m or simulated in a low air pressure testing chamber in the library. The environmental pressure of the testing chamber during the simulation test is 75 kPa. The test time is 30 min; air compressors shall be capable of operating normally under the rated pressure ratio.

4.2.4 Impact and vibration test

Conduct impact and vibration test for the air compressors in accordance with the provisions for equipment class A, category 1 specified in GB/T 21563-2008. Conduct inspection for the connectors and appearance after test. Operate continuously for 2 h under the rated discharge pressure, no abnormality shall occur during operation. […]