Which type of pump is classified as a positive displacement pump?

Which type of pump is classified as a positive displacement pump?

• A. Vertical turbine pump
• B. Centrifugal pump
• C. Horizontal split case pump
• D. Piston pump

Answer: (D)

A positive displacement pump operates by trapping a fixed amount of fluid and then forcing that volume into the discharge pipe. This action enables the pump to deliver a consistent flow rate, regardless of pressure variations in the system. The piston pump is a classic example of a positive displacement pump. It uses a reciprocating piston to draw fluid into a chamber and then expels it under pressure. This design allows it to maintain an efficient flow rate, making it suitable for applications that require precise dosing or high pressures. In contrast, the vertical turbine pump, centrifugal pump, and horizontal split case pump are all types of dynamic pumps, which operate by converting rotational energy into kinetic energy to move fluid. These pumps rely on a rotating impeller and are affected by system pressure, which means their flow rates can vary based on resistance in the piping system. Understanding this distinction is crucial for determining which pump type to use in different water distribution scenarios.

A positive displacement pump operates by trapping a fixed amount of fluid and then forcing that volume into the discharge pipe. This action enables the pump to deliver a consistent flow rate, regardless of pressure variations in the system.

The piston pump is a classic example of a positive displacement pump. It uses a reciprocating piston to draw fluid into a chamber and then expels it under pressure. This design allows it to maintain an efficient flow rate, making it suitable for applications that require precise dosing or high pressures.

In contrast, the vertical turbine pump, centrifugal pump, and horizontal split case pump are all types of dynamic pumps, which operate by converting rotational energy into kinetic energy to move fluid. These pumps rely on a rotating impeller and are affected by system pressure, which means their flow rates can vary based on resistance in the piping system. Understanding this distinction is crucial for determining which pump type to use in different water distribution scenarios.