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Pump Affinity Law for Plumbing
Applies pump affinity laws to predict performance changes with speed or impeller diameter changes.
Change Type
?
What parameter is changing.
Original Value
?
Original RPM or diameter.
RPM or inches
New Value
?
New RPM or diameter.
RPM or inches
Original Flow
?
Flow at original condition.
GPM
Original Head
?
Head at original condition.
feet
Original Power
?
Power at original condition.
HP
Calculate
Results
New Flow
-
GPM
New Head
-
feet
New Power
-
HP
References:
Hydraulic Institute Standards, ASPE Data Book Vol. 3