Catastrophic Failure - Catastrophic Failure in Centrifugal Pumps

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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