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The minimum flow of the pumps within the system can now be defined and provisions must be
made in the system to assure the total capacity is not less than this.
Total Minimum Flow of = Minimum Flow of Weakest Pump + (total No.Pumps - 1)
Pumps in System (Strong Pump Flow)
Sample: (see Figure )
1. Assume the minimum flow for a single pump is 27 GPM.
2. Data for the head - capacity curve:
At the rated point:
[EQN "[Strongest pump head = 300 +(300x2) over 100 = 306]]
[EQN "[Weakest pump head = 300 - (300x2) over 100 = 294]]
At Shutoff:
[EQN "[Strongest pump head = 360 + (360 x 5) over 100 = 378]]
[EQN "[Weakest pump head = 360 - (360 x 5) over 100 = 342]]
From head capacity curve:
Minimum weakest pump flow = 27GPM
Minimum strongest pump flow = 65GPM
Total minimum flow of pumps in a typical application with 2 pumps operating in parallel.
Total Minimum Flow of Pumps in System = 27 + (2-1) (65) = 92 GPM
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