On the calculation of shaft power for pumps in chemical processing plants
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I would like to ask the experienced engineers: how is the shaft power of pumps in petrochemical plants calculated? Which specification or manual has it? Thank you very much
Effective power divided by the shaft power factor is
For conventional centrifugal pumps, the shaft power P is given by P=QHρ/(102n), where Q is the flow rate of the medium in m3/s, and H is the head of the pump in meters； ρ is the density of the medium in kg/m3, and n is the overall efficiency of the pump ； Generally, the efficiency of small-flow pumps is ≤10%, while that of multi-stage centrifugal pumps ranges from 45 to 55% – for reference only