Back to Basics Selecting a Centrifugal Compressor
Back to Basics
Selecting a Centrifugal Compressor
James M. Sorokes Dresser-Rand
End users must specify certain performance requirements when requesting a quote for a new centrifugal
compressor. Understand your process, as well as the advantages and disadvantages of each centrifugal
compressor configuration, in order to choose the optimal centrifugal compressor for your application.
Centrifugal compressors, also called radial compressors, are critical equipment in a wide variety of applications in the chemical process industries (CPI). As their name suggests, their primary purpose is to compress a fluid (a gas or gas/liquid mixture) into a smaller volume while simultaneously increasing the pressure and temperature of the fluid. In other words, compressors accept a mass of gas at some initial pressure and temperature and raise that gas to a higher pressure and temperature (Figure 1). At the higher discharge pressure and temperature, the gas density is also higher, so the mass of gas occupies a smaller volume -- i.e., the gas is compressed.
Of the numerous technologies that can achieve compression, this article focuses on centrifugal compressors. It explores the various types of centrifugal compressors,
Inlet Pressure (P1) Temperature (T1) Volumetric Flow (Q1) Mass Flow (m)
Discharge Pressure (P2) Temperature (T2) Volumetric Flow (Q2) Mass Flow (m)
Compressor
Discharge vs. Inlet P2>P1 T2>T1 Q2 ................
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