Start your stopwatch when you hear the pressure switch turn on.Once you have that information, as well as a stopwatch to keep time, follow these steps: The manufacturer specifies the gallon drawdown. For this calculation, you need to know the specifications of your pressure tank, including how many gallons it holds, the gallon drawdown and the PSI. To most accurately calculate GPM, you use the pressure tank method and formula. So if you took 10 seconds to fill a gallon container, your GPM measurement would be 6 GPM (60/10 seconds = 6 GPM). The GPM formula is 60 divided by the number of seconds it takes to fill a one gallon container. For example, a pump specification may read 150 GPM at 50 Feet of Head, which means the pump will work at 150 gallons per minute when pumping water at a height of 50 feet. Pumps are typically measured by their GPM at a certain Head measurement. Total Discharge Head: The height from the pump to the highest point that the fluid will get pumped.Total Suction Head: The height between the fluid source and the pump.Total Head: The discharge point for the fluid.There are several different Head measurements, including:
GPM is variable based on another measurement known as the Head, which refers to the height the water must reach to get pumped through the system. GPM stands for gallons per minute and is a measurement of how many gallons a pump can move per minute. So what is GPM, and how do you calculate it? What Is GPM? When it comes to pumping terminology, one crucial term to know is GPM - a measurement that will help you determine if you’re choosing the right pump.
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