What is the pressure of the compressed air in the factory?

Plant compressed air system pressure range and setting basis

1. typical pressure range
the pressure setting of the compressed air system in the factory shall take into account the equipment operation requirements and energy efficiency management. The common pressure ranges are as follows:

• conventional condition: 0.6-0.8MPa (6-8kg force/square centimeter), suitable for most pneumatic tools, automation equipment and general production lines.
• Special process:
  • high voltage applications: such as plastic blow molding, metal molding, pressure up to 1. 0-1.3MPa (10-13 kgf/cm2).
  • Low Voltage Applications: Such as instrument control and precision assembly, the pressure can be as low as 0. 3-0.5MPa (3-5 kgf/cm2).

2. pressure setting basis

1. equipment requirements
   • pneumatic tools: such as air cannons, spray guns usually require 0.6-0.7MPa pressure to ensure work efficiency.
   • CNC machine tools: Spindle cooling, tool replacement and other systems need 0.5-0.6MPa stable gas supply.
   • Packaging machinery: such as filling machine, sealing machine to 0.4-0.5MPa to avoid packaging damage.
2. Pipe network loss
   • the pressure of compressed air will drop by 0. 1-0.2MPa. Therefore, the outlet pressure of the air compressor needs to be 0. 2-0.3MPa.
3. Energy efficiency optimization
   • for every increase in pressure, 0. 1MPa, Air compressor energy consumption increased by about 7%. Therefore, under the premise of meeting the process requirements, low-pressure systems (such as 0. 6MPa) to reduce operating costs.

3. Industry Difference Cases

1. automobile Manufacturing
   • stamping workshop: use 1.0-1.3MPa high pressure air to drive large punch.
   • Painting workshop: 0.6-0.7MPa pressure for spray gun atomized paint.
   • General assembly workshop: 0.5-0.6MPa pressure for pneumatic wrench.
2. Food & Beverage
   • bottle blowing process: 0.8-1.0MPa high-pressure air blow molding PET preforms.
   • Packaging and conveying: 0.4-0.5MPa low pressure air driven pneumatic conveyor belt.
3. Electronic Manufacturing
   • SMT patch: 0.5-0.6MPa pressure ensures stable pick-and-place components of suction nozzle.
   • Clean room: 0.3-0.4MPa low pressure gas supply to reduce airflow disturbance.

4. pressure regulation and monitoring

1. graded gas supply system
   • partial pressure through the gas storage tank: the main gas storage tank maintains 0. 8MPa, the branch pipeline is reduced to 0 through the pressure reducing valve. 6MPa 0.4MPa and other different pressure levels.
   • Intelligent pipe network: pressure sensor and frequency conversion controller are configured to dynamically adjust the exhaust pressure of air compressor according to the end demand.
2. Safety specification
   • pressure vessels (such as gas storage tanks) shall be provided with safety valves in accordance with Supervision Regulations for Safety Technology of Pressure Vessels, and the operating pressure shall not exceed 1.1 times of the design pressure.
   • The pipeline system shall be equipped with pressure gauge and alarm device. When the pressure exceeds the set range (e. g. 0.05MPa) automatically stop or alarm.

5. selection recommendations

1. new Plant Design
   • determine the system pressure according to the maximum gas equipment pressure requirements, and reserve 10%-20% redundancy.
   • Frequency conversion air compressor is preferred to realize energy-saving operation through pressure closed-loop control.
2. Existing system optimization
   • regularly detect the pressure loss of the pipe network and clean the rust slag of the pipe to reduce the resistance.
   • The pressure demand difference of the region, the use of independent ring network gas supply, to avoid “high pressure gas supply, low pressure gas” energy efficiency waste.

Conclusion The
pressure setting of the compressed air system in the factory should comprehensively consider the equipment requirements, process requirements and energy efficiency targets. Through the scientific design of the pipe network, the configuration of intelligent adjustment device, and the establishment of pressure monitoring system, can ensure the stability of production at the same time, to achieve effective control of energy costs. When planning or transforming the system, it is recommended to conduct pressure demand analysis and testing to avoid equipment failure or energy efficiency loss caused by unreasonable pressure setting.