Estimating Compressor Horsepower Estimating Compressor Horsepower
Compressor Capacity, (Q, MMcfd)
Suction Pressure, (P1,Psia)
Discharge Pressure, (P2,Psia)
Stage #
k
Result
Brake HousePower

Estimating Compressor Horsepower, GPSA Section 13

Brake Horsepower = k * ratio per stage * # of stages * MMcfd * F    (Eq 13-4)

where:

MMcfd = Compressor capacity referred to 14.4 psia and intake temperature

F = 1.0 for single-stage compression
      1.08 for two-stage compression
      1.10 for three-stage compression.

K = 22 for lower compression ratios and/or gases with a higher specific gravity
      20 for specific gravity in the 0.8 to 1.0
      16-18 for compression ratios between 1.5 and 2.0


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