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Centrifugal compressor plays an important role in oil and gas company, especially in mature field or in depleted phase. Since the pressure in the gas well cannot against the receiving point’s pressure, the compressor help to do that. Most of centrifugal compressor sized at capacity larger than reciprocating compressor. Based on experienced, the installation of centrifugal compressor for the higher capacity is more benefit than reciprocating. Because the company produced gas, …..and may be cheaper, gas turbine was chosen as compressor driver (to give energy to compressor to do the job).

Oleh : Cahyo Hardo Priyoasmoro

Centrifugal compressor plays an important role in oil and gas company, especially in mature field or in depleted phase. Since the pressure in the gas well cannot against the receiving point’s pressure, the compressor help to do that. Most of centrifugal compressor sized at capacity larger than reciprocating compressor. Based on experienced, the installation of centrifugal compressor for the higher capacity is more benefit than reciprocating. Because the company produced gas, …..and may be cheaper, gas turbine was chosen as compressor driver (to give energy to compressor to do the job).
As other rotating equipment, centrifugal compressor needs to be controlled. What control does need to be ?.

1. Surge protection

As we knew, the performance of centrifugal compressor followed the parabolic curve that represents correlation between total dynamic head vs flow. Most compressor manufacturer choose performance curve of discharge pressure vs flow (at given suction pressure and temperature) or suction pressure vs flow (at given discharge pressure and temperature at certain condition). The surge can be simplified as back flow from downstream of the compressor due to the generation of head or pressure can not withstand the downstream pressure, the flow in the inside of the compressor reversed. The damage caused by surge can totally destructive your machine.

More simple explanation about surge, because of the parabolic equation usually has two roots, x1, and x2. It is inherently not stable. Another contribution is the physical properties of gas, he is a compressible fluid. Even pump centrifugal had the same performance curve with centrifugal compressor, surge never found in pump.

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