What would likely cause an unexpected increase in discharge pressure and decrease in discharge quantity at a pumping station?

An unexpected increase in discharge pressure coupled with a decrease in discharge quantity can reasonably be attributed to the action of closing a discharge valve. When the discharge valve is closed or partially closed, it creates a higher resistance in the system against the flow of water. This increase in resistance leads to a rise in pressure because the pump is still working to push fluid through the system, but with less capacity for flow. Simultaneously, the flow rate decreases as the closure of the valve restricts the volume of water being discharged, resulting in the observed decrease in discharge quantity.

In a pumping station, the dynamics of fluid flow are closely tied to any changes in valve positions. Closing the discharge valve limits how much water can exit the system, and while the pump continues to operate, the pressure begins to build up as the pump battles against the closed valve. Thus, it is this interaction between the pump’s operation and the discharge valve that causes the simultaneous increase in pressure and decrease in flow quantity. This situation could lead to potential damage in the system if not properly managed, as excessive pressure can stress pipes and other components.