![]() If the source of water for the pump is below or above the pump suction, for the same flow rate you will get a different discharge pressure. The discharge pressure depends on the pressure available on the suction side of the pump. They do not know what flow rate you require and the flow rate of a centrifugal pump is not fixed. One of the reasons is that they do not know how you will use the pump. For example, fire extinguishers are pressurized at 60 psig (413 kPa), we put 35 psig (241 kPa) air pressure in our bicycle and car tires.For good reasons, pump manufacturers do not use discharge pressure as a criteria for pump selection. ![]() Why can't we just use discharge pressure? Pressure is a familiar concept, we are familiar with it in our daily lives. Total head is related to the discharge pressure of the pump. Total head and flow are the main criteria that are used to compare one pump with another or to select a centrifugal pump for an application.
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