Understanding the flow and pressure specifications of the facility is important when considering an air compressor. Pressure and flow are two very general concepts used to discuss compressed air systems.
Pressure can be measured in pounds per square inch (psi) or bar (metric measure of pressure). To consider this in simplified terms, pressure applies to the amount of force required to do a certain amount of work at some given point of time. A basic example of pressure and how it works is to picture a wooden block sliding around a surface. The diagram below indicates that using 75 psi of compressed air is not enough force to lift the block, but 100 psi of pressure has the potential to move the wooden block to the target distance.
The air compressor must have adequate pressure to perform the operation (in this case it was to move a wooden block). If 100 psi is required to shift the stone, anything less than that will not accomplish the mission. It is necessary to consider what pressure is required to size the compressor correctly, or you would be met with issues, similar to the example below, where the lower pressure was unable to lift the wooden block or do the job.
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