About Compressor pressurization and depressurization
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6 FAQs about [Compressor pressurization and depressurization]
Why is depressurization important in a centrifugal compressor?
Process schemes can limit the depressurization rate while mechanical constraints might require a faster rate. In complex facilities, centrifugal compressors operate at high revolutions per minute and discharge pressures. Because large amounts of energy are stored in a confined space, depressurization is a major design consideration.
Should depressurization be located on downstream side of compressor?
In such a case, hot recycle is sufficient. As for question of location of depressurization on downstream side of compressor, that makes sense to me. This would avoid reverse flow of gas from discharge to suction in the event of blowdown. Reverse flow of gas is not acceptable to avoid compressor impeller reverse rotation and surging.
How long does it take to depressurize a compressor?
Typically, the depressuriza-tion is performed to one-half of the settled out pressure or 100 psig, whichever is less, within 15 minutes. During the design stage, the acceptable maximum depressurization rate should be checked with the compressor/seal manufacturer. Mating rings are typically tung-sten carbide.
Why is depressurization a major design consideration?
Because large amounts of energy are stored in a confined space, depressurization is a major design consideration. During an emergency shutdown (ESD), the compressor's speed decrease from the operating speed to 0 rpm, while the gas in the compressor system is depressurized.
How should a depressurization system be evaluated?
An engineering evaluation of depressurization arrangements and calculations of depressurization periods should be performed. Certain conditions and arrangements (e.g., process restarts) may preclude the provision of an automatic and immediate depressurization system for all vessels.
Do I need a depressurization system?
Typically if the rupture period is several hours long, the need for a depressurization system (or blowdown) is not highly demonstrated or recommended.