What is defined as the vertical distance from the reservoir surface to the pump suction when the pump is below the reservoir?

The term defined as the vertical distance from the reservoir surface to the pump suction when the pump is located below the reservoir is known as static suction lift. This measurement indicates how far the liquid has to travel vertically to reach the pump, reflecting the height of liquid above the pump inlet.

Understanding this concept is vital in the context of pump operations, as it influences the pump's ability to draw fluid effectively. In scenarios where the pump is positioned below the reservoir, it can create challenges due to the weight of the liquid column, which may affect the overall performance of the pumping system.

Static suction head refers to the opposite situation when the pump is above the liquid level in the reservoir. Total static head considers both the suction and discharge heads in a system, while dynamic head involves additional variables such as fluid velocity and friction loss. Thus, static suction lift specifically captures the scenario described in the question, making it the correct choice.