General factory air source pressure how much bar

What is the general pressure of the factory air source?

Walking into the air compression station of any factory, one of the most frequently asked questions is how much air pressure is appropriate. This figure looks simple. In fact, it involves a series of factors such as equipment matching, pipeline loss, gas fluctuation, etc. It is not enough to set a value on the head.

The working pressure of compressed air in most factories is concentrated in the range of 6 to 10bar, that is, 0.6 to 1.0MPa. This scope covers the needs of most gas-using equipment such as pneumatic tools, automated cylinders, packaging machinery, and conveying systems. The outlet pressure of the air compression station is usually set at about 8bar, one or two bar higher than the gas consumption point, in order to compensate for the pressure loss on the pipeline from the air compression station to the end of the workshop. The longer the pipeline, the more elbows, and the more dispersed the gas points, the more obvious the pressure drop in this part, so the set value of the air compression station should be set aside.

When it comes to the specific gas point, the pressure will generally be adjusted to between 4 and 6bar. The pressure requirements of different equipment are not small. For example, a small cylinder may be enough for 4bar, while some heavy fixtures or special process equipment may require 8bar or even higher. In industries such as papermaking, printing and glass manufacturing, the process itself requires high air pressure and may be used for more than 12bar. On the other hand, some precision control occasions only need 3 to 4bar, and the pressure is too high to affect the control accuracy.

The pipe material also affects the pressure setting. If the factory uses an ordinary water gas pipe, considering that the pressure bearing capacity of the pipe decreases after aging, the gas supply pressure is often controlled at 5 to 6bar, which is relatively conservative. The workshop with special compressed air pipeline has stronger bearing capacity and larger space for pressure setting.

In actual operation, the oil-free water lubrication air compressor plays the role of continuous output of clean gas in this gas supply system. This kind of equipment uses water instead of lubricating oil to complete sealing and cooling. The discharged compressed air itself does not contain oil. For food processing, electronic manufacturing, pharmaceutical production and other production lines that are sensitive to the quality of gas sources, the back-end oil removal is omitted, and the equipment operation does not have to worry about the maintenance burden caused by lubricating oil emulsification. In the workshop where multiple air compressors cooperate with air supply, the water lubrication unit is relatively friendly to the production line of continuous air supply because it does not involve oil replacement, and the frequency of daily shutdown and maintenance is relatively lower.

There is another point that is easily overlooked: altitude and climate can make the same system behave differently in different regions. In high altitude areas, the atmospheric pressure itself is low, and the actual exhaust pressure of the air compressor will be discounted. At this time, the set value may need to be raised. The cooling efficiency decreases at high temperature in summer, which will indirectly affect the output stability of the equipment.

Therefore, there is no universal figure for the gas source pressure in the factory. 6 to 10bar is the most common range, but it is ultimately determined according to the actual running equipment in the workshop, the length of the pipeline and the fluctuation rhythm of gas consumption. If the pressure is set correctly, the equipment will run steadily and the energy consumption will not be wasted on the excess pressure drop.