well pumps

Old 04-19-02, 04:10 PM
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well pumps

i had a 36 gal bladder tank that has been replaced with a 20gal bladder tank. the pump was also replaced. now the pump runs all the time. would this be because of reducing the size of the tank or maybe the on/off pressure sensor is not correct? i also use to have 1" pipe feeding the tank and the plumber reduced it to 3/4". could this be a factor.

any thoughts or suggestions would be great, i don't want to burn up the pump for it running all the time.
Old 04-20-02, 05:18 AM
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The bladder tank pressure should be two psi below (usually 18 psi or 28 psi for residential pumps) your pump cut-on pressure.
To check it, unplug or turn off power to pump, drain the water pressure off, and check the bladder tank air valve with a tire gauge.
If it is too high, bleed it off. If it is too low, air it up with a bicycle pump or portable air tank or compressor.
You also can adjust pump cut-on/cut-off with your pressure switch.
Your pump should be set at 20-40 psi cut-on/cut-off or 30-50 psi.
Turn the spring-loaded nut(s) down to increase pressure and up to decrease.
For an excellent tutorial on wells and pumps, visit Ron Peek's website at www.peekspump.com
Good luck!
Old 04-20-02, 07:14 AM
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Well pumps

A 20 gallon bladder tank has a drawdown of just under 6 gallons (at 30/50). A 36 gallon tank has a drawdown about twice that of a 20 gallon. It could be even less if the pump/pressure tank isn't set up together, as Mike has described in his post.
Reducing the line to 3/4" probably isn't causing this problem, but I don't really understand why he put such a small pressure tank on the system.
Ron Peeks
R.L. Peeks Pump Sales

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