The normal pressure spread for cut in and cut out is 20-30 p.s.i. Most bladder tanks work by turning a pump on (cut in) a low pressure and by turning a pump off (cut off) at a higher pressure. The capacity normally listed for a bladder tank is usually based on fully filling and fully emptying the bladder. We can save you thousands onĬomplete Systems and replacement filters for most brands.īladder tanks are basically balloons that hold water and store pressure. The pressure in the air cell should be 4 psi lower than the pump cut-in pressure.Celebrating 31 years providing high quality products and advice. With the pump turned off and the water drained from the pressure tank a standard tire gauge can be used on the valve stem at the top of the tank. How do you check or change the air cell pressure? To check the pressure in the air cell, the power supply to the well pump must be turned off and the water must be drained from the pressure tank. How much pre-charge should I have in my WellMate tank? Your tanks should be pressurized to 4 PSIG less than the cut-in pressure setting (for example, if your pressure settings are 30/50, then you cut-in pressure setting is 30 PSIG and your tank should have a 26 PSIG pre-charge). This should not be confused with tank volume. Interior Tank Lining: Features a durable polypropylene liner. Tank drawdown capacity is the minimum amount of water stored and/or delivered by the pressure tank between pump shut-off and pump re-start. Separates air and water, maintains air charge. Heavy Duty Diaphragm: Made of finest quality butyl rubber. The pressure switch monitors the pressure inside the tank and activates and de-activates the pump when cut-in and cut-out pressures are reached inside the tank. Inner Shell: Prevents diaphragm from over-expanding.
How does a pressure switch control the pump and tank? The pressure switch communicates with the tank and the pump. Does the warranty cover labor? No, unfortunately there are number of factors that can contribute to a failed tank and the only factor that WellMate can insure is the tank. What is the warranty on WellMate tanks? All WM WellMate tanks carry a five year limited factory warranty for potable water residential installations and 2 years for non-residential installations. Drawdown is a affected by the pump, the size of the tank and the pressure settings that govern your water system. Questions & Answers What is tank drawdown? Drawdown refers to the amount of water that evacuates the tank before the pressure switch will activate the pump. WellMate Tanks Limited Warranty Statement Warranty Period: Factory 5 years warranty period for potable water residential installations and 2 years for non-residential installations.ĭrawdown In Gallons At Various Pressure Ranges Tank Drawdown In Gallons Maximum temperature: 120 degrees Fahrenheit Recommended Precharge: 4 PSI lower than pump cut-in pressure Pressure must be adjusted accordingly upon final product installation Precharge: 24 PSI as per DOT CFR Title 49. Outer shell: Filament wound with fiberglass roving and epoxy resin.īladder: Heavy-gauge polyurethane (Separates air and water).īottom inlet/outlet assembly: high-impact PVC A tank’s drawdown volume is the amount of water that is stored between a high and low pressure, which is usually determined by a pump switch. Drawdown Volume: The amount of water that is drawn out from a starting tank pressure down to the minimum pressure. A larger tank gives more drawdown which means that more water is available before the pump is needed. Acceptance Factor: The percentage of of tank volume storing fluid, expressed as a decimal. Tank drawdown is the amount of water that can be removed from a tank, when it is full, before the tank pressure drops and the pump is turned on to refill the tank. Equivalent in drawdown to a 82 gallon galvanized atmospheric tank. WellMate fiberglass pre-charged 30 gallon bladder well pressure tanks # WM9.
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