What may occur if a centrifugal pump runs in the wrong rotation?

When a centrifugal pump operates in the wrong direction, it typically leads to a reduced flow. This is because the design of a centrifugal pump relies on the rotation of its impeller to generate kinetic energy that moves fluid through the system. If the pump spins backwards, the impeller does not function effectively; instead of pushing the fluid forward, it may create turbulence or even pull the fluid in the opposite direction.

This backward operation disrupts the intended flow path through the pump, ultimately resulting in significantly lower flow rates. The fluid may not be adequately lifted or moved through the system as designed, leading to inefficiencies.

Increased pressure is unlikely to occur because the pump is unable to generate the required head when running in reverse. Enhanced efficiency is also not a possibility since misalignment of the pump's operation leads to a waste of energy. Similarly, while running in reverse may create more noise due to turbulence, the primary and more significant consequence is the reduction in flow.