Pump Runout refers to which of the following?

Pump Runout refers to which of the following?

• A. The operating point where the head is maximum
• B. The intersection of the system head curve and the pump head curve
• C. Best Efficiency Point only
• D. The moment when NPSH equals zero

Answer: (B)

In pump systems, the actual operating point is found where the pump’s ability to develop head matches what the piping system requires. The pump head curve shows how much head (pressure rise) the pump can deliver at every possible flow. The system head curve shows how much head is needed to push fluid through the pipes at those same flow rates, considering static lift and friction losses. The point where these two curves intersect is where head supplied by the pump exactly equals head demanded by the system, so that the flow and head are self-consistent. This intersection is what’s referred to as the pump runout—the limit at which the pump can meet the system’s demand for that configuration. Beyond this point, the pump cannot supply more head to push more flow for the given system. The Best Efficiency Point is simply a design/operating target on the pump curve and isn’t inherently the runout intersection, and having NPSH equal zero is about cavitation risk, not the operating point where the curves meet.

In pump systems, the actual operating point is found where the pump’s ability to develop head matches what the piping system requires. The pump head curve shows how much head (pressure rise) the pump can deliver at every possible flow. The system head curve shows how much head is needed to push fluid through the pipes at those same flow rates, considering static lift and friction losses. The point where these two curves intersect is where head supplied by the pump exactly equals head demanded by the system, so that the flow and head are self-consistent. This intersection is what’s referred to as the pump runout—the limit at which the pump can meet the system’s demand for that configuration. Beyond this point, the pump cannot supply more head to push more flow for the given system. The Best Efficiency Point is simply a design/operating target on the pump curve and isn’t inherently the runout intersection, and having NPSH equal zero is about cavitation risk, not the operating point where the curves meet.