Starting condition for a centrifugal pump to deliver liquid Identify the correct head rise condition inside the impeller that must be met before flow is delivered to the discharge line. Choose the correct head term.

Concept

• A centrifugal pump begins to deliver when the pressure rise produced by the impeller equals or exceeds the system's manometric head.

Manometric head
H_mano includes static elevation difference (delivery minus suction) plus frictional and minor losses between suction and delivery gauge points.

Why others are incorrect
Kinetic/velocity head are components inside the impeller/volute, but delivery starts when the full manometric requirement is met.

Final Answer
Manometric head.