Centrifugal Pumps - Minimum Flow

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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 ^oF is accepted in the casing - minimum flow through a centrifugal pump can be calculated as

q = P_BHP / 2.95 c_p SG         (1)

where

q = minimum flow rate (gpm)

P_BHP = power input (BHP)

c_p = specific heat capacity (Btu/lb ^oF)

SG = specific gravity of the fluid

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