Pump Total Head

The total head of a pump is the difference between the energy level at the pump discharge (point 2) and that at the pump suction (point 1), as shown in Figures 7 and 8. Applying Bernoulli's equation (Eq. 1) at each point, the pump total head TH in feet (meters) becomes

V2 ps

The equation for pump differential pressure PA in pounds per square foot (newtons per square meter) is

FIGURE 7 Centrifugal pump total head
FIGURE 8 Example 1

where the subscripts d and s denote discharge and suction, respectively, and H = total head of system, (+) or (-) ft (m) gage or (+) ft (m) abs P = total pressure of system, (+) or (-) lb/ft2 (N/m2) gage or (+) lb/ft2 (N/m2) abs V = velocity, ft/s (m/s)

p = pressure, ( + ) or (-) lb/ft2 (N/m2) gage or ( + ) lb/ft2 (N/m2) abs Z = elevation above (+) or below (-) datum plane, ft (m) g = specific weight (force) of liquid, lb/ft3 (N/m3) g = acceleration of gravity, 32.17 ft/s2 (9.807 m/s2)

Pump total head TH and pump differential pressure PA are always absolute quantities because either gage pressures or absolute pressures but not both are used at the discharge and suction connections of the pump and a common datum plane is selected.

Pump total head in feet (meters) and pump differential pressure in pounds per square foot (newtons per square meter) are related to each other as

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