X-trol tank cut open

Old 05-17-18, 06:49 PM
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X-trol tank cut open

After reading the sticky on the Xtol expansion tank I suspected mine didnít have any air pressure. I installed a service valve (ball valve with bleeder) and a new tank. I took the old one into the garage and checked the air pressure and it was 0 psi. I tried adding air but it was exiting out the top pipe fitting. So I cut it open to determine the cause of failure. To my surprise the diaphragm was good. I believe the failure was caused from no air pressure as it was never checked since installed in 2005 and sludge got between diaphragm and tank. In retrospect I could have cleaned it with dawn dish soap and hot water? Replacement was only $32.
see pics.
The tank passed the static tests, hot top, cold bottom and tapping test.
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Old 05-17-18, 07:00 PM
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A pressure tank can loose 1-2psi per season/year.

If you were putting air into the schrader valve and it was coming out the water connection.... the diaphragm would have to be leaking.
Old 05-18-18, 03:44 AM
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Putting air in the schrader valve would have expelled all the air in the water side until the diaphragm expanded into the air side of the tank. If the air continued to escape after that air was expelled then the diaphragm would have been leaking. The best test is to try and expel air at the shrader valve while the tank was connected to the system. With the schrader valve at the bottom of the tank, water would have been expelled instead of air or a combination of both air and water.

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