To be able to test pressures, test ports are required in the system before and after the pump to test pump pressure. See HotMail article, "Prepare to Balance a Water System." Step One –Assure the system is 100% complete and filled with fluid.Any air must be removed from the system. Later in the testing process, you can use the knowledge gained from the dead head test to plot pump and system flow under normal operating conditions. With these two data points known and plotted, you can effectively test, diagnose, and balance with confidence. Without this test, the pump flow or impeller size are unknown. This verifies the pump flow potential and impeller size. The “Dead Head” pressure is plotted in feet of head on a curve from the pump manufacturer. ![]() The discharge valve is closed, leaving the pump rotating as it pushes water against a closed valve with no flow through the system. The test is also called a Pump Shut-Off Head Pressure Test.īoth names describe the pump condition during the test. Let’s take a look at how you can measure pump pressures and plot flow using a pump curve in nine simple steps.īy the way, the test instruments necessary to measure pump pressures include a digital hydro-manometer and accessories or, a pressure gauge attached to the system measuring pressure in PSI.Įxcluding Grateful Dead followers, the term “Dead Head” describes a test that water balancers use to estimate pump flow. The same principles are used to determine pump flow, measured in gallons per minute (gpm). When testing fan performance, measured total external static pressure (TESP) and fan speed are used to plot airflow on a fan curve.
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