What is the maximum lift a centrifugal pump can handle effectively?

The correct answer is based on the operating principles of centrifugal pumps. A centrifugal pump's maximum effective lift, also known as its "maximum head," is generally considered to be around 25 to 30 feet for most applications. However, the physical limitations related to atmospheric pressure impose a practical limit on the suction lift a centrifugal pump can achieve when lifting liquids.

When considering the specific choices given, the figure around 15 feet is more closely aligned with the practical maximum suction lift for many typical applications, especially when accounting for factors such as fluid viscosity, temperature, and the efficiency of the pump design. In an ideal scenario with water at sea level, the maximum theoretical lift is around 33.9 feet (which corresponds to atmospheric pressure), but in practical terms, because of losses and other hydraulic factors, the usable lift is lower.

This context helps to clarify why 15 feet is considered a more commonly encountered effective maximum lift for centrifugal pumps in practical applications, aligning with the operational expectations noted in the industry.