Positive displacement compressors have flexibility in pressure range, have higher efficiency, and can deliver compressed gas at wide range of pressures. However, centrifugal compressors have less efficiency than positive displacement compressors. They also operate at high speeds and are of balanced construction. They can handle larger volumes within a small area compared with positive displacement compressors.
Centrifugal compressors have lower capital cost and lower maintenance expenses. Centrifugal compressors are more commonly used in gas transmission systems because of their flexibility. Centrifugal compressors, on the other hand, develop the pressure required by the centrifugal force resulting from rotation of the compressor wheel that translates the kinetic energy into pressure energy of the gas. These compressors have a fixed volume and are able to produce high compression ratios. Piston-operated reciprocating compressors fall within the category of positive displacement compressors. The high-pressure gas is then released through the discharge valve into the pipeline. Positive displacement compressors generate the pressure required by trapping a certain volume of gas within the compressor and increasing the pressure by reduction of volume. Shashi Menon, in Transmission Pipeline Calculations and Simulations Manual, 2015 11 Types of Compressors: Centrifugal and Positive DisplacementĬompressors used in natural gas transportation system are either positive displacement type or centrifugal type.
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