In most pump installations, how does the size of the discharge pipe compare to the suction pipe?

In many pump installations, the discharge pipe is often smaller than the suction pipe to maintain high velocity and minimize the risk of cavitation. The larger diameter of the suction pipe facilitates sufficient fluid flow into the pump, allowing it to operate efficiently and maintain the required net positive suction head (NPSH). Conversely, the discharge pipe being smaller can help increase the fluid velocity, enabling better pressure build-up and more effective movement of the fluid through the system.

Additionally, reducing the size of the discharge pipe can lead to increased pressure on the fluid, helping it overcome resistance as it exits the system. This design also assists with managing flow rates and optimizing pump performance. By understanding these principles, one can appreciate the importance of pipe size in a pump installation context.