Catastrophic Failure in Centrifugal Pumps
A catastrophic failure of a centrifugal pump can occur if the liquid within the pump casing is allowed to vaporize. To prevent flashing due to overheating of the fluid, a flow must be maintained through the pump to keep the liquid below saturation temperature.
If a temperature rise of 15 °F (8 °C) is accepted in the casing—minimum flow through a centrifugal pump can be calculated as
q = PBHP / 2.95 • cp • SG (1)
where
- q = minimum flow rate (gpm)
- PBHP = power input (BHP)
- cp = specific heat capacity (Btu/lb °F)
- SG = specific gravity of the fluid
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