Well pressure tank question

A port to add air to a non-bladder pressure tank can be anywehere on the tank at least 6 inches from the outlet to the water system. If the port is not at the top it just becomes a little tricky to say whether or if or when the tank is waterlogged.

If a non-bladder tank is prepressurized in the same manner as a bladder tank, the pump cycling will at least for a few weeks be about the same as for a bladder tank, namely the amount of water occupying the tank will typically range from 2 percent to 33 percent (1/3) of the tank capacity.

It will work if you just empty the non-bladder tank of water and then let the pump refill it. But here the tank performance is much less than optimum. The amount of water occupying the tank will probably range from something like 66% to 77% (2/3 or 6/9 up to 7/9) of the tank capacity as you use water and the pump cycles on and off. The first 66% worth of water will not come out before the pump restarts although in case of power failure that water will come out at low pressure and be usable while you wait for power to be restored.

Meanwhile simply adding air unscientifically or even arbitrarily or haphazardly to a non-bladder tank will forestall or even prevent waterlogging as water slowly absorbs the air over weeks or months. If you don't add enough air then the tank will waterlog sooner or later. If you add too much air the only disadvantage is that air will puff out of a faucet or shower once in awhile.

Usually a non-bladder tank found in a house will be somewhat larger than .the recommended bladder tank size.. In which the roughly 7/9 to 2/3 drawdown in gallons for the non-bladder tank is comparable to the typical 1/3 to near zero drawdown in gallons for the typical bladder tank.

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Last edited by AllanJ; 08-11-20 at

08:58 AM

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