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Centrifugal Pump
System Head Curve

System Head Curve

Centrifugal Pump System Head Curve

To Calculate a System Head Curve several points must be chosen to calculate friction losses on both the suction and discharge sides of the pump at various flow rates. The static suction head/lift and the static discharge head remain constant.

Using the example on the previous page for <--Calculating TDH for a flooded suction application plot the friction losses for 50, 90 and 100 GPM as follows:

Suction Side

Flow

Rate

GPM

Total

Equivalent

Length

of Pipe

Friction

Loss/100'

of Pipe

Friction

Loss

Total

Static

Head

Suction

Head

50 26.3 1.38 0.36 10 9.67
90 26.3 4.08 1.07 10 8.93
100 26.3 4.96 1.30 10 8.7

Discharge Side

Flow

Rate

GPM

Total

Equivalent

Length of

Pipe

Friction

Loss/100'

of Pipe

Friction

Loss

Total

Static

Head

Discharge

Head

50 202.3 9.9 20.03 50 70.03
90 202.3 29.4 59.5 50 109.5
100 202.3 35.8 72.4 50 122.4

Total Dynamic Head(TDH) at 50 GPM = 70.03' - 9.67' = 60.36'


Total Dynamic Head(TDH) at 90 GPM = 109.5' - 8.93' = 100.6'


Total Dynamic Head(TDH) at 100 GPM= 122.4' - 8.70' = 113.7'

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