Air Tank in Water Lines

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BigFoot
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Post by BigFoot » Mon. Apr. 01, 2013 7:38 am

Had water coming out of pop off valve ,added air to the tank in line and water leak stoped ,what should the PSI in the tank be ? I just added about 5lbs ,(10 sec with air hose,no gauge ) :?:

 
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steamup
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Post by steamup » Mon. Apr. 01, 2013 11:19 am

Look up the installation instructions for your tank. Tank should be precharged to the same setting as your fill prv valve setting. This must be set before the tank is pressurized on the system.

The tank size is governed by the fill pressure setting, relief valve setting, system volume and system temperature rise. Too small a tank will not permit sufficient expansion and may cause the relief valve to open.

Adding air to a tank hooked to the system that is pressurized and warm is only a temporary fix.

 
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BigFoot
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Post by BigFoot » Sun. Apr. 07, 2013 7:36 am

thanks I changed the pop off valve, looks like thats the fix

 
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Rob R.
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Post by Rob R. » Sun. Apr. 07, 2013 9:00 am

12 psi is the normal pressure setting for the fill valve an diaphragm tank unless you have a home with more than two stories.


 
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coaledsweat
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Post by coaledsweat » Sun. Apr. 07, 2013 7:06 pm

To charge the tank, first bring the system to zero pounds with the feed valve closed. Once the expansion tank is charged, re pressurize the system.

 
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BigFoot
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Post by BigFoot » Sat. Apr. 13, 2013 10:30 am

Thanks for your help with this! :D

 
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AA130FIREMAN
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Post by AA130FIREMAN » Sat. Apr. 13, 2013 1:42 pm

I have 2 expansion tanks with shut off valves at each tank. The valves are the type that have a bleeder to relieve the pressure before checking /adding air to the bladder. I just make shure I open the valve when done and use a zip tie to keep it open (just so kids don't tamper with it). Remember pressure is higher at the lowest point on a water column. With 12 lbs of pressure at the bottom, if you were to measure around 24 feet up on the column, you would have 0 lbs, measure up 12 feet and you have 6 lbs of pressure.

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