Positive-Displacement Compressor

Definition - What does Positive-Displacement Compressor mean?

A Positive-Displacement Compressor is a device which is used to compress natural gas so that it can be transported to long distances via interstate or intrastate pipelines. These compressors increase the pressure of the natural gas by decreasing its volume mechanically which ultimately increases the speed as well as gas pressure inside the pipeline. The compressor usually contains pistons which enable it to function well.

Petropedia explains Positive-Displacement Compressor

A positive-displacement compressor is divided into two main types, i.e., reciprocating piston type compressor and rotary type screw compressor.

A Reciprocating Compressor is a positive-displacement gas compressor that works on a reciprocating principle to deliver gas at high pressure. The reciprocating motion is enabled by pistons within the device. It is divided into two types, i.e., Separable (High speed) compressor and Integral (Low speed) compressor. Large reciprocating natural gas engines are used to move natural gas, generate low-pressure plants and supply the gas at high pressure for well drilling.

A Rotary type Screw Compressor is a positive displacement gas compressor that works on a positive action of the rotating elements. These compressors generally replace the piston type compressors which make use of large volumes of air at high pressure, either for large industrial applications or to operate high-power air tools such as jackhammers.
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