Phil,
I have two bladder tanks - in parallel. The reason is that, years ago, the single bladder tank diaphragm broke and the pump started short cycling. But I didn't know it. Pump died. $$$$$$$
Now I have two 50 gallon bladder tanks with the correct air pressure set for the differential pump pressure relay. Just a couple years ago, I noticed that one tank had lost its diaphragm, but the pump was NOT short cycling as it was using the capacity of the other one. I just bought another new bladder pressure tank to replace the old one.
Pressure bladder tanks are FAR cheaper than deep well electric pumps.
If I do change the set point pressures to lower levels, I know that I must also change the air pressure in the bladder tanks.
With the larger capacity in the two bladder tanks, the pump runs longer, but with fewer off - on cycles. As I understand it, the number of cycles is what kills submersible pumps.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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