Centrifugal Pumps - Minimum Flow
Minimum continuous flow to prevent flashing in centrifugal pumps.
Sponsored Links
Catastrophic failures may occur in centrifugal pumps if the liquid within the pumps starts to vaporize. A minimum flow through the pump must be maintained to prevent flashing within the casings. The heat transferred from the motor must be removed to keep the fluid below its saturation temperature at the actual pressure.
If 15 oF is accepted as a temperature rise in the pump casing - the minimum water flow through the pump can be estimated to
q = PBHP / 2.95 cp SG (1)
where
q = minimum flow rate (gpm)
PBHP = power input (BHP)
cp = specific heat of fluid (Btu/lb oF)
Sponsored Links
Related Topics
-
Pumps
Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more.
Related Documents
-
Centrifugal Pumps - Shut-Off Head
Centrifugal pumps and maximum shut-off head. -
Centrifugal Pumps - Speed Torque Curve
The characteristic speed torque curves for centrifugal pumps. -
Centrifugal Pumps - Stable and Unstable Flow
The characteristics of stable and unstable flow. -
Centrifugal Pumps - Viscosity Influence
Hydrodynamic losses through pumps depends on fluid viscosities. -
Pumps - Affinity Laws
Turbo machines affinity laws can be used to calculate volume capacity, head or power consumption in centrifugal pumps when changing speed or wheel diameters. -
Pumps - Specific Speed
Characterizing of impeller types in pumps in a unique and coherent manner.
