Which type of pump is NOT classified as dynamic?

The reciprocating pump is not classified as a dynamic pump because it operates on a fundamentally different principle than dynamic pumps. In a reciprocating pump, the mechanism involves a piston or diaphragm that moves back and forth to displace the fluid. This positive displacement action creates volumetric flow by trapping a fixed volume of fluid and moving it through the discharge.

On the other hand, dynamic pumps, such as centrifugal and gear pumps, rely on kinetic energy to move fluids. They use rotating elements to impart energy to the fluid, transforming mechanical energy into fluid motion through continuous flow, rather than the intermittent discharge seen in reciprocating pumps. Diaphragm pumps also operate on the positive displacement principle but in a different manner compared to reciprocating pumps.

This distinction between the operation types highlights why the reciprocating pump is categorized separately from dynamic pumps, which focus on maintaining a constant flow based on rotation and energy transfer rather than displacement.