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Centrifugal Pumps
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Specific speed (US)
Specific speed (US)
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Overview
Assumptions
Calculate US version of specific speed
Flow and head values are taken at the best efficiency point.
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Input 3 of 4 variables to solve for the unknown.
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Symbol
Variable
Input
Units
N
s
Specific Speed
specific speed
N
Rotational Speed
revolutions/minute
revolutions/seconds
revolutions/hour
radians/second
radians/minute
radians/hour
hertz
cycles/second
cycles/minute
cycles/hours
Q
Flow
gallons/minute
cubic feet/minute
cubic feet/second
meters³/minute
centimeter³/minute
gallons/hour
meters³/hour
barrels/minute (petroleum)
barrels/hour (petroleum)
barrels/day (petroleum)
barrels/minute (US)
barrels/hour (US)
barrels/day (US)
liters/hour
liters/minute
H
Head
feet
centimeters
meters
millimeters
inches