All well water pumps are rated continuous duty (running constantly). Pump starts kill pump motors so the fewer starts the better. You get fewer gallons because higher pressure empties the tank faster (the water moves faster the velocity is higher) than at lower pressures.Īnd you need 60 seconds off for proper motor cooling between starts. The fewer gallons means the quicker the pump starts. It doesn't matter how many gallons, it is the length of time the pump is off between starts. Same tank, switch settings at 30/50, less than 5 gals. a nominal 20 gal bladder type tank with 20/40 psi pressure switch settings delivers roughly 6+ gals from pump off at 40 psi down to pump on at 20 psi. I am saying that the tank, regardless of its size, will have more or less draw down gallons depending on the pressure range the pump is operated at. It allows the pump to run continuously while you are using water, which gives you constant pressure and greatly reduces the number of start/stop cycling of the pump that kills motors and, you don't need a large tank taking up a large space and their high prices.Ĭlick to expand.No I'm not. That is a sum total of all the various fixtures using water in gpm at any given time but especially when the most water is being used.Īnother way to go and to be able to use a very small tank (as small as 2+ gals), is to use a CSV (Cycle Stop Valve). This has nothing to do with your peak demand gpm in the house. Of course that varies based on the size of the tank.Īnyone selling tanks can tell you the gallons per various pressure ranges. The lower the pressure, the higher number of gallons between pump off and on the higher the pressure the fewer gallons. The amount of the draw down gallons is dictated by the pressure range the pump is operated at 30/50, 40/60 etc. If less than a minute, the tank is too small for the pump. So, run the water until the pump comes on, shut off the water and at the same time the pump comes on (switch closes) time how long it takes 'til the pump shuts off. You size a pressure tank so the pump is off between starts for a minimum of 60 seconds (for proper cooling of the motor) for up to and including 1.5 hp motors.
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