Pressure of well pumps can be stated in one of two ways. Typically, the pressure is stated in PSI, which stands for pounds per square inch. 1 PSI is equal to 2.31 feet. The second way to state the pressure of a well pump is the vertical lift or LIFT. For example, when a submersible well pump is operating, it forces water through a pipe. If the pipe is vertical, then the pipe will have pressure throughout it. The longer the pipe is, the more pressure the pump will need in order to fill it. However, if the pipe is horizontal then the pressure is converted to flow. The only pressure in the situation of a horizontal pipe is the pressure that is exerted due to friction as the water flows through the pipe.