Page 175 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Compressor Best Practices Best Practice 3 .11

The actual volume flow rate will vary as a result of the operating m kgf kg
Head Mass flow
point change which is the intersection of the turbo-compressor kgm hr
Power kW = +Mech. losses kW
curve (pressure vs. flow) and the system resistance m kgf
3,600 η(%)
The mass flow rate (lbs/min) will be the product of the new min. kW
3
3
actual volume flow rate (ft /min) and the gas density (lb/ft )at ft lb lb
the new gas conditions (M.W., P, T, Z) Head lb Mass flow min
The standard volume flow rate (scfm) will be the product of the Power BHP = ft lb
3
new actual volume flow rate (ft /min) at its pressure temperature 33,000 η(%)
Min H.P.
corrected for standard conditions (14.7 PSIA and 60°F)
+ Mech. losses BHP
Fig 3.11.9 The effect of gas composition on turbo-compressor flow
rate
Fig 3.11.10 The effect on power

Fig 3.11.11 Stage and section performance

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