How do size a pressure tank

To properly size your well pressure tank, you need to know three things: 


1. Flow Rate

Your flow rate is how many gallons per minute your pump produces. 


2. Minimum Runtime 

Multiplying the flow rate by the minimum runtime of the pump will give you the drawdown capacity. The minimum runtime rule of thumb is any pump operating at 10 gallons per minute (GPM) or under should be producing one gallon per minute of runtime.

(For example, 10 GPM flow rate x 1 = 10 gallon drawdown capacity.)


Anything above 10 GPM should be producing 1.5 gallons per minute of runtime.

(For example, 16 GPM flow rate x 1.5 = 24 gallon drawdown capacity.)

If your flow rate is above 20, you may require multiple tanks.


3. Pressure Switch Setting

The pressure switch setting is the pressure at which the pump turns on to fill the tank up, and the pressure at which the pump shuts off, knowing the tank is full. The three pressure switch settings for pressure tanks are 20/40, 30/50, and 40/60. The first number is the pressure at which your pump turns back on and the second number is the pressure at which your pump turns off (i.e. 20psi on, 40 psi off). The number that turns off the pump pressure is going to have the most direct effect on your drawdown capacity. For example, if you have a 40/60 switch, you are going to have less drawdown capacity than you would have on a 30/50 switch.

Most well pressure tank manufacturers will provide you will a chart to tell you what your drawdown capacity is based upon the pressure switch setting. 


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