Understanding Air Compressor Jargon

When discussing air compressors, the terms and acronyms are unique to this technology

. Air compressors are a series of systems, valves and other components that move air. Different measures and processes are involved. Here are the most important terms, acronyms and phrases related to air compressors.

Dynamic Type Compressors are those in which air is compressed by impellers that rotate to create velocity and pressure in the air. Impellers are rotating elements, usually blades, which use centrifugal force to create air pressure. A rotating compressor is also known as a Positive Displacement Compressor.

Positive Displacement Compressors are those that take air into a confined space. The space is reduced to create air compression. Reciprocating or rotating compressors fall into this category.

Reciprocating Air Compressors are those that use pistons that move in a reciprocating motion in a cylinder to compress air. A reciprocating compressor is also known as a Positive Displacement Compressor.

Duty cycle is an expression that represents the amount of time that a unit needs to cool down after being in operation for a specified amount of time. Most reciprocating air compressors are not made to run constantly.

Capacity is the air flow amount and is normally written as cubic feet. This is between an inlet flange and the discharge point of the compressor. Inlet pressure is the pressure at an inlet flange. Discharge Pressure is the total of gas pressure at the discharge point.

Demand refers to the requirements of air flow at a specific point or in the whole facility.

Intercooling is the process of cooling gases in compression to drop the temperature, reduce the gas volume, to turn vapors into liquids while saving power resources.

FAD (Free Air Delivered) or Actual Capacity refers to gas quantity that is compressed and then delivered to the discharge system.

CFM is an acronym that stands for Cubic Feet per Minute. An air compressor needs a certain CFM to operate properly. SCFM is an acronym for Standard Cubic Feet of air per Minute.

Desiccant is a moisture absorber that is used in conjunction with the process of adsorption. Adsorption is a process where the desiccant removes the moisture from compressed air.

The manuals that come with air compressors have the specifications and instructions required to operate the compressor. Refer to those manuals for safe and recommended procedures. Understanding all the different air compressor terminologies will help anyone when dealing with these technologies.

by: Bill Fitzell

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