What are the requirements for explosion-proof air compressors

As a key equipment in special environments, explosion-proof air compressor must be designed, manufactured and used in strict compliance with explosion-proof standards to ensure safe operation in flammable and explosive gas environments. The following are its core requirements:

1. Explosion-proof level and certification

1. Explosion-proof classification
   Select the matching explosion-proof level based on the type of gas in the environment (such as IIA, IIB, IIC, representing the explosive level of the gas) and the temperature group (such as T1-T6, corresponding to the highest temperature on the equipment surface). For example:
   • ExdIIBT4: Suitable for places with Class B gas composition, and the equipment surface temperature is ≤135℃.
   • ExdIICT4: Suitable for use in highly flammable gas environments such as hydrogen, with the same temperature limit.
2. international certification standards
   • ATEX(Europe): EU access standards for explosion-proof equipment.
   • IECEx(International): International Electrotechnical Commission explosion-proof certification, applicable to most regions around the world.
   • GB(China): Comply with China national standards (such as GB3836 series) and require an explosion-proof certificate.

2. Structural and material design

1. fully enclosed body
   The body is completely sealed to prevent explosive shock waves from damaging valves and pipelines, and to avoid sparks or high-temperature gas leakage.

2. Explosion-proof materials and processes

   • housing material: Use copper alloy, stainless steel and other materials that do not produce sparks.
   • manufacturing process: Strict quality control to ensure no internal spark risk.

3. Electrical explosion-proof design

   • explosion-proof motor: Motors must pass explosion-proof certification to ensure no sparks during operation.
   • electrical connection: The junction box is cast and sealed (such as epoxy resin), and the lead wire sealing complies with GB3836.9 standard.

3. Cooling and temperature control

1. forced cooling system
   Water cooling or forced air cooling is used to control the exhaust temperature ≤150℃ to prevent high temperature ignition of gases.

2. temperature monitoring
   Equipped with temperature sensors and alarm devices to monitor equipment temperature in real time.

4. Safety devices

1. Safety valves and pressure control
   • The safety valve needs to be released quickly in case of overpressure to prevent equipment from exploding.
   • The pressure gauge is checked regularly to ensure accurate readings.
2. Explosion-proof accessories
   • rupture disk: Rupture and pressure relief under extreme pressure.
   • sparkless exhaust device: Avoid sparks during exhaust.

5. Use and maintenance requirements

1. environment adapting
   It is suitable for use in flammable and explosive places such as petroleum, chemical industry, and coal mines. The concentration of ambient gases needs to be regularly tested.

2. operation specifications

   • Operators must undergo professional training and work with certificates.
   • Equipment maintenance in dangerous areas is strictly prohibited (shutdown and move to a safe area).

3. regular maintenance

   • Lubricating oil replacement: Use explosion-proof certified lubricating oil and replace it regularly (refer to manufacturer’s recommendations for cycle).
   • safety inspection: Check oil levels, leaks, and abnormal noises daily; test safety valves monthly; check explosion-proof housing integrity quarterly.

6. Special scene design

• dust explosion-proof: In a combustible dust environment, a higher protection level (such as IP65) is needed to prevent dust from entering the equipment.
• Oil-free design: Some scenarios require oil-free compression to prevent oil from contacting high-temperature parts and causing fires.

Through the above requirements, the explosion-proof air compressor can operate safely and stably in dangerous environments, effectively avoiding the risk of explosion caused by sparks or high temperatures. Be sure to follow relevant standards and certifications when selecting and using them to ensure equipment compliance.