Which pump type delivers flow in distinct pulses or surges?

Which pump type delivers flow in distinct pulses or surges?

• A. Jet pump
• B. Propeller pump
• C. Reciprocating pump
• D. Centrifugal pump

Answer: (C)

Pulsed or surging flow comes from pumps that move a fixed volume of water with each action. A reciprocating pump is a positive-displacement device: a piston or plunger moves back and forth, and each forward stroke pushes a specific amount of water out through the discharge valve. After the stroke, the intake draws in another fixed volume, so the discharge flow drops until the next forward stroke. This creates distinct pulses or surges in the outlet flow, tied to the cycle frequency. In contrast, jet pumps, propeller (axial) pumps, and centrifugal pumps rely on continuous motion of fluid driven by a nozzle or an impeller, producing a steadier, more uniform flow as long as speed and demand are constant. Accumulating the explanation, the inherent, per-cycle displacement of a reciprocating pump naturally yields pulsating flow, which is why it’s the correct choice.

Pulsed or surging flow comes from pumps that move a fixed volume of water with each action. A reciprocating pump is a positive-displacement device: a piston or plunger moves back and forth, and each forward stroke pushes a specific amount of water out through the discharge valve. After the stroke, the intake draws in another fixed volume, so the discharge flow drops until the next forward stroke. This creates distinct pulses or surges in the outlet flow, tied to the cycle frequency.

In contrast, jet pumps, propeller (axial) pumps, and centrifugal pumps rely on continuous motion of fluid driven by a nozzle or an impeller, producing a steadier, more uniform flow as long as speed and demand are constant. Accumulating the explanation, the inherent, per-cycle displacement of a reciprocating pump naturally yields pulsating flow, which is why it’s the correct choice.