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Old 11-09-2009, 07:22 AM   #1
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Conventional expantion tank fills up


I have a boiler with a single zone feeding cast iron radiators. Their is a large conventional expansion tank in the ceiling (I figure 25 gallons or so). To drain it I off the valve to the tank and let it drain. It takes about an hour to get all the water out with the vacuum lock but I am positive that it is empty because I can lift if up and feel it. As soon as I turn the valve back on and run the boiler a few hours she is full again. Am I using the wrong procedure to drain the tank?
Yes I know I can replace it with a diaphram tank. I'd rather get this one working properly.

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Old 11-09-2009, 08:43 AM   #2
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Conventional expantion tank fills up


How do you know that it is full? Does the temperature/pressure relief valve on the system open to blow off excess pressure? An expansion tank will fill partially with water under normal conditions.

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Old 11-09-2009, 05:41 PM   #3
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Conventional expantion tank fills up


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Last edited by Marlin; 11-09-2009 at 06:18 PM.
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Old 11-09-2009, 05:44 PM   #4
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Conventional expantion tank fills up


There might be a tiny leak near the top of the tank or in a valve at the top of the tank causing loss of the air inside.
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