The casing surrounding the impeller on a pump is known as what?

The correct term for the casing surrounding the impeller on a pump is known as the volute. The volute is designed to collect the fluid from the impeller and convert the kinetic energy generated by the impeller into pressure energy, allowing for efficient fluid movement through the system. Its shape aids in effectively directing the flow of the liquid as it exits the pump, helping to minimize turbulence and optimize performance.

Understanding the role of the volute is crucial for pump operation, maintenance, and design, as it plays a significant part in the hydraulic performance of the pump. The volute specifically refers to a spiral-shaped casing that optimizes flow, which distinguishes it from other components like the housing, shell, or chamber, which might serve different functions or contain other parts of the pump but are not specifically designed to convert energy as the volute does.