What condition is described when the pump inlet is above the liquid level in the supply reservoir?

When the pump inlet is positioned above the liquid level in the supply reservoir, it creates a situation known as suction lift. This occurs because the pump must work against gravity to draw the liquid upward into the pump. The distance between the liquid surface in the reservoir and the centerline of the pump is crucial for effective operation. If the pump is too high above the liquid level, it may struggle to achieve the necessary pressure to lift the liquid, resulting in cavitation or loss of prime.

Suction lift is an important concept in pump operations, as it directly impacts the efficiency and performance of the pump system. When calculating the pump's capabilities, understanding suction lift helps determine whether the pump can function effectively given its installation height relative to the supply reservoir.