The Importance of Proper Pump Operation

What type of pump may be damaged if it is started with the discharge valve closed?

1) Centrifugal pump

2) Positive displacement pump

3) Reciprocating pump

4) Axial flow pump

Answer:

Starting a positive displacement pump with the discharge valve closed may damage the pump.

A pump is an important piece of equipment in various industries, and it is crucial to operate it correctly to prevent damage and ensure efficient performance. One common mistake that can lead to pump damage is starting a positive displacement pump with the discharge valve closed.

Positive displacement pumps work by trapping a fixed amount of fluid in a chamber and then displacing it into the discharge piping. Unlike centrifugal pumps, which generate flow based on the system's pressure, positive displacement pumps create a fixed amount of flow regardless of the discharge pressure.

When a positive displacement pump is started with the discharge valve closed, the pressure inside the pump builds up rapidly as the fluid has nowhere to go. This increase in pressure can overload the pump components, leading to mechanical failure or damage. It is essential to ensure that the discharge valve is open before starting the pump to allow the fluid to flow freely and prevent pressure buildup.

Proper pump operation not only extends the pump's lifespan but also maximizes its efficiency and reduces the risk of costly repairs. Regular maintenance and following the manufacturer's guidelines for pump operation are key to ensuring optimal performance and avoiding unnecessary damage.