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Pressure Tank Sizing Pressure Tank Applications Pressure tanks should be sized to limit maximum starts per day as required in information furnished by the motor manufacturer. When used with a Cycle Stop Valve, maximum starts per day can only occur when flow is less than minimum controlled flow for the model valve you are using. (See Cycle Stop Valves replace large hydro tanks) Small Systems 1 to 50 GPM CSV1 and CSV1.25 Cycle Stop Valves have a minimum flow through the valve of approximately 1 and 2 gpm. We recommend a minimum of a 2 minute run time. With the CSV1, this would be a 2 gallon drawdown tank and with the CSV1.25 this would be a 4 gallon drawdown tank. This makes a leak or continuous flow of less than minimum the worst case scenario. One example of run time when you are using less than the minimum controlled flow would be a continuous draw of .5 of a gpm with a CSV1. Under these circumstances, a 6 gallon draw down tank will deliver 12 minutes of water before the pump starts. It would then take 12 minutes to fill the tank and shut the pump off again. Twelve minutes on and twelve minutes off is a cycle every twenty four minutes, or about 60 cycles per day. With any demand of more than 1 gpm with the CSV1 or 2 gpm with the CSV1.25, the tank is not used at all, pressure is held constant and water flows directly past the tank into the system. (See chart below) Large Systems 50 to 5000 GPM CSV2 and CSV3 Cycle Stop Valves have a minimum flow of approximately 5 gpm. This makes a leak or continuous flow of 2.5 gpm the worst case scenario. In this case, the tank will fill at 2.5 gpm and the leak will draw water from the tank at 2.5 gpm. A pressure tank with a drawdown of 25 gallons will be filling for 10 minutes and draining for 10 minutes. This would make the pump cycle every 20 minutes. The pump would start 3 times an hour or 72 times a day. There will be no excess water to fill a pressure tank as long as at least 5 gpm is being used. Large systems, such as cities with 50 or more houses, golf courses, feed yards, or others, will always be using or leaking at least 5 gpm. While the pressure is held constant by the CSV, no water enters or leaves the pressure tank. The size of the tank makes little difference. Use any tank available from a 20 gallon to an 86 gallon actual size to cushion the pressure switch. When located together, multiple pumps can use the same pressure tank. Each pump must have its own CSV and pressure switch with staggered pressure settings. When not physically located together but pumping into the same system, pumps must have their own pressure tank, Cycle Stop Valve, and pressure switch at each location. Suggested Pressure Tank Selections
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| Cycle Stop Valves® is a registered trademark. All right reserved unless prior authorization is obtained. Cycle Stop Valves are patented: Patent number 5,988,984 and other patents pending. |
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