Are there any requirements for the maximum pressure of the air compressor

Analysis of maximum pressure setting principles and safety specifications for air compressor

The maximum pressure of the air compressor is the core safety parameter, and its setting must strictly follow equipment design limits, process requirements and safety regulations. From a professional perspective, combined with industry specifications and typical application scenarios, the following systematically expounds the setting principles, safety specifications and implementation points for the maximum pressure of air compressors.

1. Principle for setting maximum pressure

1. Equipment design limits
   • mainframe withstand voltage: The design pressure of the main air compressor (screw rotor, cylinder, etc.) is usually 1.2-1.5 times the rated pressure, as a safety redundancy. For example, for an air compressor with a rated pressure of 0.8MPa, the main machine has a withstand pressure of 1.0-1.2MPa.
   • Piping and accessories: The rated pressure of compressed air pipelines, valves, flanges and other accessories must match the maximum pressure of the air compressor to prevent the risk of bursting.
2. Process requirements matching
   • Gas equipment pressure: Set the maximum pressure of the air compressor according to the needs of end-use air equipment (such as pneumatic tools, spraying equipment, instrument control systems). A redundancy of 10%-20% is usually reserved to compensate for pipeline pressure drop.
   • special technological requirements: In high-pressure application scenarios (such as high-pressure bottle blowing, laser cutting), a customized high-pressure air compressor is needed, with a maximum pressure of 1.5-3.0MPa.

2. Safety specifications and regulatory requirements

1. Pressure Vessel Safety Code
   • Air storage tank inspection: As a pressure vessel, the air storage tank must comply with the “Safety Technical Supervision Regulations for Fixed Pressure Vessels”(TSG21), and internal and external inspections must be carried out every 3 years to ensure pressure resistance.
   • relief valve setting: The opening pressure of safety valves of air compressors and air storage tanks must be set to 1.05-1.1 times the maximum allowable working pressure to prevent overpressure operation.
2. Equipment certification standards
   • CE certification: Air compressors exported to the EU must comply with EN1012 “Compressor Safety Specifications”, clarifying safety parameters such as maximum pressure and temperature.
   • Special equipment licensing: In China, air compressors with rated pressure ≥0.1MPa need to obtain the “Special Equipment Manufacturing License” and mark the maximum allowable working pressure.

3. Key points for the implementation of maximum pressure setting

1. Selection stage
   • demand analysis: Count the pressure demand of all gas equipment, draw a pressure-flow curve, and determine the maximum pressure of the air compressor. For example, if the terminal equipment requires a maximum of 0.8MPa and the pipeline pressure drop is 0.1MPa, the maximum pressure of the air compressor needs to be set to 0.9MPa.
   • equipment selection: Select an air compressor with a rated pressure slightly higher than the calculated value to avoid component wear caused by long-term full-load operation.
2. installation and commissioning stage
   • Pressure gauge calibration: Install a pressure gauge with an accuracy of 1.0 at the outlet of the air compressor. The pressure fluctuation range during debugging is ≤±0.02MPa.
   • relief valve test: Verify whether the opening pressure of the safety valve conforms to the set value through a pressurization test to ensure that the pressure can be relieved in time when overpressure is exceeded.
3. Operation and maintenance phase
   • pressure monitoring: Monitor the outlet pressure of the air compressor in real time through the SCADA system, and set alarm thresholds for high pressure (≥ maximum pressure) and low pressure (≤ rated pressure).
   • regular calibration: Calibrate the pressure gauge and safety valve every year to ensure their accuracy.

4. Overpressure operation risks and prevention and control

1. risk analysis
   • equipment damage: Overpressure operation will cause faults such as increased bearing load on the main engine, failure of seals, and burst of pipelines, shortening equipment life.

• safety accidents: Overpressure may cause safety accidents such as gas tank explosions and pipeline leaks, causing casualties and property losses.

2. prevention and control measures
   • pressure control device: Configure pressure switches, frequency conversion regulators and other devices to ensure that the air compressor automatically starts and stops or regulates speed within the maximum pressure range.
   • emergency plan: Formulate an overpressure emergency plan, including emergency shutdown procedures, pressure relief operation steps, personnel evacuation routes, etc.

5. Adaptation to special scenarios

1. High-voltage application scenarios
   • equipment customization: In scenarios such as high-pressure bottle blowing and laser cutting, it is necessary to customize high-pressure air compressors and configure special high-pressure pipelines, valves and safety devices.
   • staged compression: Adopt multi-stage compression technology to reduce the compression ratio of each stage and improve energy efficiency and security.
2. Multiple units parallel system
   • pressure balance: When multiple air compressors are running in parallel, pressure balance needs to be achieved through pressure sensors and controllers to avoid overpressure operation of a certain unit.
   • standby unit: Configure standby units to automatically switch when the main unit fails to ensure stable system pressure.

conclusion

The maximum pressure setting of an air compressor requires comprehensive consideration of equipment design limits, process requirements and safety regulations. Through scientific selection, precise debugging and strict maintenance, the air compressor can be ensured to operate stably within a safe pressure range, extend equipment life, and reduce safety risks. Enterprises should establish a pressure management system, clarify pressure setting, monitoring and emergency response procedures, and regularly provide safety training to operators to provide reliable pressure guarantee for the compressed air system.