What are the practical and theoretical lift numbers?

In plumbing and fluid dynamics, lift refers to the ability of a pump to lift water vertically from a source to a discharge point. The practical lift is the maximum amount a pump can lift in real-world conditions, which takes into consideration factors such as friction loss and other inefficiencies in the system.

The theoretical lift is the calculated maximum height that a pump can theoretically achieve under ideal conditions, assuming 100% efficiency without any friction losses, air entrapment, or other impeding factors.

In the context of the provided numbers, the correct values of practical lift being 25 feet and theoretical lift being 34 feet indicate a scenario where the system is functioning efficiently, yet not perfectly. This allows a reasonable buffer between the practical and theoretical numbers. The practical lift being less than the theoretical value reflects the common understanding in plumbing that actual conditions rarely achieve ideal efficiencies.

The specific values of 25 feet (practical) and 34 feet (theoretical) suggest that the pump is operating effectively while acknowledging the realities faced in typical plumbing systems.