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Posted by Bruce on October 05, 2006 at 15:41:26:
In Reply to: expansion tank posted by joe on October 01, 2006 at 19:42:07:
: Hi, On my boiler system in my home in the line there is a expansion tank. You can't see inside of it. Do you have any tips for me that would tell me when or if it was bad and needed to be replaced? Thanks.
An experienced person can tell by tapping on the tank. A tank with a broken diaphram will be full of water and sound different from one which has some water and some air.
If your overflow valve is not opening (or your pressure gauge does not go up substantially) when the burner fires up, the tank is probably OK, otherwise it needs to be replaced.
If you have a shut-off valve at the tank, you can turn off the burner, ALLOW THE WATER IN THE SYSTEM TO COOL, close the shut-off valve, and remove the tank. Empty the water out -- the tank should not be more than, say, 1/3 full of water if it's OK.