Air can be compressed to a pressure of up to several kilograms

The ultimate pressure of air compression is restricted by multiple factors such as compressor type, material strength, and thermodynamic laws, and varies significantly in different application scenarios. The following is a systematic analysis based on multiple engineering literature and physical data:

1. Pressure range for conventional industrial applications

In most industrial scenarios, the operating pressure of an air compressor is usually 0.4-1.0 MPa (about 4-10 kg)This range can meet the needs of pneumatic tools and automation equipment. For example:

• Low voltage scene(Painting, pneumatic tools): 0.6-0.8 MPa (6-8 kg).
• Medium and high pressure scenarios(Drilling, punching): 0.8-1.4 MPa (8-14 kg).

2. Compressor type and limit pressure

Different compressor designs determine its pressure output capabilities:

1. piston compressor
   • conventional models：7-10 bar（0.7-1.0 MPa）。
   • High-voltage model: It can reach more than 30 bar (3 MPa) through multi-stage compression.
2. screw compressor
   • conventional design：5-13 bar（0.5-1.3 MPa）。
   • special models: Pressure can be further increased by optimizing bearings and seals.
3. centrifugal compressor
   • applicable scenarios: Large flow, low pressure (usually ≤5 bar).
   • limitations: It is difficult to achieve high pressure through single stage compression.
4. scroll compressor
   • low pressure applications：3-10 bar（0.3-1.0 MPa）。
   • advantages: Simple structure, but limited pressure range.

3. Physical limits and engineering challenges

1. theoretical limit
   According to the gas equation, air is 100 MPa（1000 bar） It can be liquefied at the bottom, but the material strength needs to be considered in engineering (for example, the pressure of carbon steel pipes is usually ≤40 MPa).

2. Ultra-high pressure applications

   • Aerospace/Nuclear Industry: Multi-level supercharging equipment can reach More than 1000 barHowever, such equipment is not for conventional industrial use.
   • material limitations: High-strength alloys or ceramics are required, which is extremely costly.

4. Balance between pressure and cost and safety

In actual production, the selection of pressure requires weighing the following factors:

1. energy consumption: For every 1 bar increase in pressure, energy consumption may increase by 5%-8%.
2. equipment cost: The price of high-pressure compressors is usually 2-3 times that of low-pressure models.
3. safety: The risk of high-pressure gas leakage is higher, and safety valves, pressure sensors and other devices are needed.

V. Summary

There is no absolute value for the limit pressure of air compression, but the common range in the industry is clear:

• General requirements: 0.4-1.4 MPa (4-14 kg).
• special high pressure: Through equipment selection, it can reach tens of MPa (such as more than 30 bar).
• Ultra-high voltage field(>100 MPa): Relying on special technology, non-universal industrial scenarios.

In practical applications, pressure levels need to be comprehensively selected based on process requirements, equipment investment and safety standards to avoid blind pursuit of extreme pressure and resulting in cost and safety risks being out of control.