Four pumps in parallel with VFD control on each pump will be used for my project. total head 432 ft, required total flow 130 gpm and there is a bypass circuit to the system. the manufacturer recommended min. fluid flow of 7 gpm for each single pump. the min. demand flow rate is 10 gpm. i have attached the system curve and pump curve. if i am correct the lead pump start frequency has to be no less than 51hz. my question is how do you read from the curve the lower frequency of other pumps need to start/shutdown.
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