What is the pressure of compressed air commonly used in factories?

The air pressure range of compressed air commonly used in factories is usually 0.5 MPa to 1.0 MPa(5 bar to 10 bar) the specific value should be determined according to the process requirements, equipment type and industry specifications. The following is a detailed analysis:

1. pressure range for general application scenarios

1. pneumatic Tools and Automation Equipment
   • pneumatic tools(e. g. pneumatic wrench, sander) usually requires 0.6 MPa to 0.8 MPa stable air pressure to ensure operational efficiency and safety. For example, when painting in the body repair shop, the air pressure needs to be controlled 0.5 MPa to 0.8 MPa to avoid paint flaws.
   • Automation equipment(Such as sensors, control valves) have high requirements for air pressure accuracy, generally set 0.7 MPa to 1.0 MPa to ensure the stability of equipment operation.
2. Heavy Machinery and Special Processes
   • hydraulic power unit, pneumatic clamp such heavy equipment may require above 1.2 MPa(12 bar) air pressure to ensure clamping force or power output. For example, in CNC machining, the air pressure required for the normal operation of pneumatic fixtures is 0.6 MPa to 1.0 MPa between.
   • sand blasting process the abrasive is driven by a high-pressure airflow, and the pressure range is usually 0.7 MPa to 1.2 MPa to achieve the ideal surface treatment effect.
3. Low pressure demand scenario
   • food and pharmaceutical industry: Some devices only need below 0.5 MPa(5 bar) the air pressure, to avoid high-pressure shock lead to product damage or pollution.
   • laboratory precision instrument: May require 0.2 MPa to 0.4 MPa low pressure gas source to match the experimental conditions.

Core Principles of 2. Pressure Setting

1. industry specifications and equipment compatibility
   • widely used in international and domestic industries 0.7 MPa as the basic pressure design value, ensure equipment compatibility. For example, design calculations are used by default. 0.7 MPa as a standard value to balance energy efficiency with equipment costs.
   • Chemical, machinery and other industry manuals clearly, compressed air pressure is generally required 0.2 MPa to 0.8 MPa under special circumstances, it is necessary to meet the requirements of water content, oil content and other indicators.
2. Line pressure loss compensation
   • the outlet pressure of the air compression station is usually set 0.8 MPa, while the actual use pressure at the equipment end is 0.6 MPa to 0.7 MPa, To compensate for line pressure loss. For example, the main pipeline gas supply pressure is not lower 0.7 MPa, the gas consumption point is adjusted 0.4 MPa to 0.5 MPa.
3. Energy consumption and cost optimization
   • every increase in pressure 1 bar energy consumption may increase 6% to 8%. Therefore, the minimum necessary pressure should be selected according to the equipment requirements to avoid energy waste. For example, when the machining workshop is equipped with an air compressor, it is recommended to reserve 10% to 20% the pressure margin to cope with the peak gas consumption.

3. air pressure adjustment for special scenes

1. winter and humid environment
   • every winter needs 2 hours manually drain the water in the air storage tank, or install an automatic drain valve to prevent the pipeline from freezing. For example, the northern project installed a preheating device at the air inlet of the air compressor to ensure the success rate of winter start-up. 100 percent.
   • Wet environment needs to pass through the three-stage filter (filtration accuracy 0.01 μm2) Purify compressed air to prevent equipment corrosion or failure.
2. Intelligent and Energy-saving Technology
   • variable frequency air compressor: Energy saving compared with power frequency models more than 30% suitable for large load fluctuations. For example, after an enterprise adopts a variable frequency air compressor, its annual power consumption is from 1.2 million kWh drop 850000 kWh.
   • IoT monitoring: The comprehensive energy efficiency ratio (SEER) of the air compressor group is removed from 5.2 lift 6.1 remote monitoring and predictive maintenance.

4. Safety and Code Requirements

1. high pressure risk prevention and control
   • compressed air pressure exceeds 0.2 MPa direct contact with the human body may cause serious injury (e. g. subcutaneous emphysema, organ rupture). If the distance from the nozzle to the skin is less 7mm, 0.35 MPa the above compressed air can penetrate the skin and cause fatal air embolism.
   • The Classification Standard for Casualty Accidents of Enterprise Employees clearly lists high-pressure gas leakage as a physical risk factor, and it is necessary to install pressure reducing valves and safety valves.
2. Pipeline Design and Maintenance
   • the material of the gas supply pipe shall be selected according to the pressure level (such as carbon steel pipe and stainless steel pipe), and the leakage shall be checked regularly. For example, the working pressure exceeds 1.6 MPa the oxygen pipeline needs to be installed after the valve. 5 times diameter of equal diameter copper tube to prevent sparks.
   • Regularly clean the cooler and oil-water separator to ensure that the compressed air quality meets the requirements. ISO 8573-1 standard (oil content ≤ 0.01 mg/m & sup3;, dust content ≤ 0.1 μm).