I am setting up Variable Speed Drives's that are running 2 centrifugal pumps that are plumbed series (Discharge of Pump 1 piped to suction of Pump 2). Both pumps are identical. Pump1 is sucking water out of an irrigation ditch and the discharge is plumbed directly into the suction of pump2. The pump supplier did all of the head calculations and this configuration is supposed to be adequate for the customers demands. My goal is to set up the drives to maintain a certain pressure on the pipeline. Should the speeds of both pumps be synchronized with each other or should pump 2 ramp up to and assist only after pump 1 has reached maximum speed?
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