How do I establish centrifugal compressor discharge design pressure? Can we arbitrarily add pressure to compressor maximum operating pressure to establish the design pressure of downstream piping and equipment? In the case of pumps, we take the shut off pressure of the pump as the design pressure of downstream equipment.
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Re: Establishing centrifugal compressor discharge design pressure
22 May 2008 at 1:29pm
Attached is a diagram showing a compressor performance map. The compressor discharge pressure moves along the system resistance line as the speed of the compressor is changed. The system resistance line is based on the downstream piping and equipment. There can be no arbitrary pressure that we can state but that pressure depends on the resistance of pipes and equipment downstream of the compressor. The compressor discharge pressure increases by decreasing the flow along the constant speed lines. The flow must be maintained at a minimum from the surge line by a margin of about 8-12% depending on the importance of the compressor. Surge in a compressor is very destructive phenomenon which can lead to severe damage to the compressor. Surge lines can move to a higher flow depending on the fouling experienced in the compressor.
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