To size a pump, which two parameters are required?

To size a pump, which two parameters are required?

• A. Flow (GPM) + Pressure rating
• B. Voltage and current
• C. Temperature rise and noise level
• D. Pipe diameter and head loss

Answer: (A)

Sizing a pump comes down to matching what the system needs in two ways: how much fluid has to be moved and how much pressure (head) the pump must develop to overcome system losses. The essential parameters are the desired flow rate (typically expressed in GPM) and the pressure or head the system requires to deliver that flow at the discharge. The pump you choose must be able to provide at least that flow at that head, which is why pump curves are used to find the operating point where system head equals pump head. Electrical quantities like voltage and current don’t define hydraulic capacity, and while temperature rise and noise are important for operation, they don’t determine the sizing. Pipe diameter and head loss are part of evaluating the system, but you still need a specific flow and corresponding head to size the pump correctly.

Sizing a pump comes down to matching what the system needs in two ways: how much fluid has to be moved and how much pressure (head) the pump must develop to overcome system losses. The essential parameters are the desired flow rate (typically expressed in GPM) and the pressure or head the system requires to deliver that flow at the discharge. The pump you choose must be able to provide at least that flow at that head, which is why pump curves are used to find the operating point where system head equals pump head.

Electrical quantities like voltage and current don’t define hydraulic capacity, and while temperature rise and noise are important for operation, they don’t determine the sizing. Pipe diameter and head loss are part of evaluating the system, but you still need a specific flow and corresponding head to size the pump correctly.