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Posted by Ziad on March 11, 2008 at 20:21:26:
I have a 1983 Burnham boiler that has been recently moved in the basement. The old steel expansion tank has been replaced with a bladder type expansion tank (Flexcon HTX 60) mounted on an air scoop and vent on the supply side of the boiler.
I am concerned about the operating pressure of the boiler which reaches a maximum of about 24 psi when the boiler has been continuously only for a couple of hours. The boiler water temperature gage reads 170-180 F at the high point. When the boiler is cold, the pressure is set at 12 psi. The expansion tank is new and was properly pre-pressurized to 12 psi.
The expansion tank was sized properly for a boiler of about 100k BTU/Hr and cast iron radiators.
All radiators in the house (2 stories above basement), get properly hot.
Is it OK for the boiler to reach a pressure of 24psi when the relief valve is set to open at 30? People suggest pressure ranges between 12 and 15 it seems.
What else could cause a pressure increase like that?
My plumber and I are at a loss. Any information would be very helpful.
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