Fluid cavitation and pump failure may occur if the liquid within a centrifugal pump starts to vaporize. The pressure and temperature and flow through a pump must be carefully monitored to prevent process fluid vaporization within a pump casing. Because the pump’s motor is a continuous heat source, removal of its heat is an important consideration when trying to keep the fluid below its saturation temperature at the pressure within the pump.
Minimum flow through a pump can be estimated with the following equation.
where:
q = minimum flow rate
PBHP = power input in BHP
Cp = Specific heat of the fluid (BTU/lb °F)
SG = Specific gravity of the fluid
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