Compressed air pressure standards and selection guide (enterprise version)

1. Pressure unit and scope

1. Basis of unit conversion

• 1 kilogram force per square centimeter (kgf/cm²) ≈ 0.1 MPa (MPa)
  In engineering, it is often simplified to “kg” to represent pressure, for example:
  • 3kg ≈ 0.3MPa
  • 8kg ≈ 0.8MPa

2. Universal pressure range

2. Industry standards and specifications

1. Basis for core standards

• GB/T 3853-2018
  Specify the energy efficiency level of air compressors. Pressure is a key parameter in energy efficiency testing. Priority is given to Level 1 energy efficiency equipment to reduce long-term costs.
• GB 22207-2020
  Safety standards require equipment to be equipped with pressure protection devices, gas tanks need to be equipped with dual pressure gauges, and bursting disc action pressure shall not exceed 1.1 times the design pressure.
• JB/T 13963-2020
  Clarify the technical specifications and rated exhaust pressure of reciprocating piston air compressors for bottle blowing3.0-6.0 MPa (30-60kgf/cm²), covering indicators such as mechanical performance, safety protection and noise control.

2. Special industry requirements

• medical field
  Ventilators, surgical instruments and other equipment need to be stabilized in3-5kgf/cm², meets the strict requirements of medical standards for pressure stability.
• food and beverage industry
  The pressure of packaging and filling equipment needs to be controlled within4-6kgf/cm², avoid oil pollution and meet HACCP, ISO 22000 and other health standards.

3. Pressure selection principles

1. Application scenario matching

• pneumatic tools
  Common tools (such as paint guns) require4-6kgf/cm², high-precision tools (such as CNC machine tool changers) require6-8kgf/cm²。
• spraying process
  Electrostatic spraying requires5-7kgf/cm²To ensure the atomization effect of the coating, ordinary spraying can be appropriately reduced to4-5kgf/cm²。

2. Equipment capabilities adaptation

• Air compressor selection
  Select the model according to the maximum pressure demand of the end gas equipment, and reserve a margin of 10%-20% to cope with peak demand.
  example: If equipment requires6kgf/cm², it is recommended to select rated pressure7-8kgf/cm²compressor.

3. Balancing energy consumption and cost

• Relationship between stress and energy consumption
  Every time the pressure increases1kgf/cm², energy consumption increased by about 5%-8%. On the premise of meeting production needs, reasonable reduction of pressure can help save energy.
• Optimization of frequency conversion control
  Adopt a variable frequency air compressor to adjust the output pressure according to real-time demand to avoid no-load operation (no-load energy consumption accounts for 15%-30%).

4. System stability and security

• Pressure fluctuation control
  The volume of the air storage tank needs to meet the pulse gas demand, and the maximum pressure is limited by a pressure regulating valve to ensure that the system pressure is stable within ±0.5kgf/cm².
• safety protection measures
  Install pressure switches, safety valves and pressure sensors to monitor pressure in real time and trigger alarms or shutdown protection.

4. Practical suggestions

1. Create stress files
   Record the pressure demand and actual operation data of each gas equipment, and optimize system parameters through trend analysis.
2. Implement regular testing
   Use a pressure gauge to verify the system pressure every quarter to ensure that the displayed value is consistent with the actual value, and the error does not exceed ±0.2kgf/cm².
3. Optimize pipe network design
   Shorten the length of the pipe and reduce the number of elbows. The diameter of the main pipe is designed according to the maximum flow rate, and the branch pipes are gradually reduced according to the end demand.
4. Choose reliable suppliers
   Priority should be given to suppliers that provide a warranty of>3 years for the whole machine and a warranty of>5 years for core components to reduce long-term maintenance costs.

Through scientific selection and system optimization, companies can ensure that compressed air pressure is stable within a reasonable range, taking into account production efficiency and energy costs.