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Some Pump manufacturers do not provide efficiency curves.

Instead they provide a performance curve for a certain impeller 

diameter and with a specific electric motor. Such pumps should notbe used for selection of HVAC pumps. If the manufacturers cannot

provide an efficiency curve for a pump, another manufacturer 

should be consulted

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Increasing impeller dia will be able to handle a greater head to deliver the same

flow rate. However pump will deviate from BEP

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Centrifugal Pumps are Variable Torque Machines. Power required to turn the

pump varies with the cube of the speed.

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A reduction in performance of the pump could occur due to unusual wear and

tear or entry of air into the pump.

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Increasing the number of pumps will reduce flow through each

pump.Indiscriminate addition of pumps result in the final pump adding only a

fraction of its capability to the system capability

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