Compressor Terminology: Different Technical Terms in Air Compressor

(Last Updated On: 18/04/2018)

Compressor Terminology is nothing but the small words used to describe some engineering functions. Before taking up the actual study of air compressor one must know the important terms which are frequently used.

You have to know these Compressor Terms because they are the fundamentals of air compressor technology.

One who is interested in reciprocating air compressor must always remember the following Compressor Terminology.

Compressor Terminology

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  • Important Compressor Terminology

Air Compressor

This is the machine which is used to increase the pressure of air by reducing its volume.

Reciprocating Air Compressor

This is a machine which compresses air by means of piston reciprocating inside the cylinder bore.

Single Acting Compressor

This is a machine which compresses air in only one end of piston and cylinder.

Double Acting Compressor

This is a machine where the air is compressed at both ends of piston and cylinder.

Single Stage Compressor

This is a machine in which air from atmospheric pressure is compressed up to desired discharge pressure in a single operation (stage).

Two Stage Compressors

This is a machine in which air from atmospheric pressure is compressed up to the desired pressure in two stages.

In the first stage, air is compressed to an intermediate pressure & in the second stage; it is further compressed to desired discharge pressure.

Multistage Compressors

This is a compressor in which air is compressed from atmospheric pressure to desired pressure in more than two stages.

Rotary Compressor

This is a machine in which the compression is effected by a rotating vane or impeller that imparts velocity to the flowing air to give it the desired pressure.

Inlet Pressure

This is the absolute pressure of the air at an inlet (Suction) to a compressor.

Discharge Pressure

This is the absolute pressure of the air at an outlet (delivery) of a compressor.

Compression Ratio

This is the ratio of the absolute discharge pressure to the absolute inlet pressure.

Free Air Delivery (FAD)

Free air delivery is the volume of air delivered under the conditions of temperature and pressure existing at the compressor intake.

This generally taken 1.0332 kg/cm² abs & 15-degree centigrade, if an air condition is not given.

Capacity of Compressor

Capacity is the volume of air delivered by the compressor. It is generally expressed in cubic feet/min. or meter cube/ min.

Theoretical Horse Power

This is the horsepower required to compress adiabatically the air delivered by a compressor through specified pressure range, without any provision for lost energy.

Brake Horse Power

BHP is the actual horsepower input required by a compressor.

Compressor Efficiency

This is the ratio of theoretical horsepower to the brake horsepower.

Volumetric Efficiency

This is the ratio of the capacity of a compressor to the piston displacement of the compressor.

Shall I hope, above compressor terminology help you to understand the topic?

Besides this information, you are suggested to read something more from below engineering books

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