The total static head is the vertical distance the pump must lift the water. The components of the total static head for a surface water and well water pumping system are shown. The total dynamic head (TDH) is the sum of the total static head, total friction head and pressure head. An explanation of these terms follows and is shown graphically in Figure 1.įigure 1. The total dynamic head of a pump is the sum of the total static head, pressure head, friction head and velocity head. The total head of a pump is composed of several types of heads that help define the pump’s operating characteristics. Pressure and head are interchangeable concepts in irrigation because a column of water 2.31 feet high is equivalent to 1 pound per square inch (PSI) of pressure. Head refers to the height of a vertical column of water. “Head” is a term commonly used with pumps.
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