How should the pressure of industrial compressed air be set? An analysis of typical operating ranges, pressure drops, and equipment requirements.

Introduction: The Core Significance of Pressure Setting

In industrial production, compressed air is regarded as the second-largest power source, after electricity. Properly setting system pressure not only determines the operational efficiency of pneumatic equipment but also directly impacts the energy consumption of the entire compressed-air system. Setting the pressure too high leads to unnecessary energy waste, while setting it too low can cause equipment to operate sluggishly or even shut down. Therefore, scientifically analyzing the logic behind pressure settings is a critical step in optimizing energy efficiency in manufacturing facilities.

Common pressure ranges for industrial compressed air

In most conventional industrial applications, the supply pressure of compressed air is typically set at0.6 MPa to 0. 8 MPaBetween. This range can meet the requirements of the vast majority of standard pneumatic components and general-purpose pneumatic tools.

• Low-pressure system: Certain specialized processes, such as material conveying and fermentation stirring, typically utilize low-pressure air supply ranging from 0.2 MPa to 0.4 MPa.
• Medium-voltage system: Conventional machining, assembly lines, packaging machinery, and the like commonly use pressures ranging from 0.6 MPa to 0. 8 MPa.
• High-pressure system: Certain specialized test equipment, high-pressure purging, or specific pneumatic systems may require pressures ranging from 1.0 MPa to 3.0 MPa, or even higher.

Generation and Impact of Pressure Drop in Pipeline Networks

The outlet pressure of an air compressor does not equal the actual pressure received at the equipment’s downstream end. As compressed air flows through the piping network, friction in the pipes, along with resistance from fittings such as elbows, valves, and filters, results in…Pressure loss (pressure drop).

Typically, the pressure drop in a well-designed piping network should be kept within0.05 MPa to 0. 1 MPaWithin this range. If the pressure drop is too large, it can lead to the following issues:

• The terminal equipment experiences reduced operational efficiency due to insufficient pressure.
• To compensate for the pressure drop, it is necessary to increase the air compressor’s discharge pressure, resulting in a sharp rise in energy consumption.
• Excessively high air velocity may exacerbate pipe wear and increase the risk of condensate formation.

Analysis of Pressure Requirements for Various Pneumatic Devices

Different terminal devices exhibit significantly varying sensitivities to pressure and differing requirements; therefore, when setting system pressure, it is essential to consider…The most demanding end‑user requirementsAs a benchmark, while also taking into account the equipment’s cost-effectiveness.

• Standard cylinders and pneumatic valvesTypically, a working pressure of 0.4 MPa to 0.6 MPa is sufficient to ensure smooth operation.
• Pneumatic grinder and wrench: These types of instruments are relatively sensitive to pressure fluctuations and typically require a stable pressure of 0.6 MPa to 0.7 MPa to maintain their rated speed and torque.
• Spraying equipment: Extremely high stability of air pressure is required; pressure fluctuations directly affect the atomization performance, and a constant pressure of 0.5 to 0.6 MPa is generally necessary.

Optimization Strategy for Scientifically Determining System Pressure

To ensure the system operates efficiently, companies should follow these strategies when setting and managing compressed air pressure:

• Demand-driven configuration: Conduct a comprehensive inspection of all gas‑using equipment in the workshop, identify the equipment with the highest actual pressure requirement, and set the air compressor’s target discharge pressure accordingly—taking into account an appropriate pressure drop across the piping network—to avoid arbitrarily increasing the pressure.
• Tiered gas supply and pressure reduction usageFor situations where the workshop contains a large number of low-pressure-demand devices, a dual‑pressure air supply system can be employed, or a higher pressure can be maintained in the main pipeline while installing pressure-reducing valves at the inlet of the low-pressure equipment, thereby preventing high‑quality compressed air from being downgraded for use.
• Optimize pipeline network design: Adopt a looped pipe network design in place of a tree‑like configuration, increase the diameter of the main pipelines, and reduce the number of bends and valves to lower system pressure drop at the physical level.
• Regular maintenance consumables: Regularly replace the air compressor’s internal filter elements, the dryer’s filter elements, and the pipeline network filters to prevent additional pressure drops caused by clogged filters.