The simplest method to use for determining if a centrifugal pump is operating as designed is to __________.

Correct Answer: Option C — close off the discharge valve, and watch for a rise in pressure

Closing the discharge valve allows the pump to reach its 'shut-off head.' Comparing this observed pressure to the manufacturer's performance curve is the simplest, most effective field test to verify the pump's internal condition, impeller integrity, and overall hydraulic performance without requiring complex diagnostic equipment.