Centrifugal pumps are connected in series if the discharge of one pump is connected to the suction side of a second pump. When the pumps are to be operated in series,
They should be started and stopped sequentially, but with minimum time lag.
Any pump, next in sequence should be started immediately after the delivery valve of the previous pump is even partly opened. Due care should be taken to keep the air vent of the pump next in sequence open, before starting that pump.
Both pumps must run at the same speed otherwise create problem in flow and head of pump.
Both pumps must have the same width impeller or the difference in capacities (Cubic meters/hour) could cause a cavitations problem if the first pump cannot supply enough liquid to the second pump.
Be sure both pumps are filled with liquid during start-up and operation otherwise may create no discharge condition.
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