Expansion tank

John_70

I noticed that the expansion tank on my boiler rusted out and was leaking pretty good this afternoon. I purchased and installed a new tank and I thought all went well. They are both listed at 12 psi. Now the relief valve is leaking. Anyone have any ideas?

gerry gill

is it a diaphram tank or

a compression air tank?

John_70

It is a Watts ET-30
Pre-charge Pressure 12PSI
Working Pressure 60PSI
Hydrostatic Test Pressure 75PSI
Operating Temp 240F

gerry gill

did you check the air charge

before installation? what about the fill valve on the system, is it bleeding thru?

John_70

I used a tire pessure gage on the new tank, it was 12 PSI

hr

What's the pressure

at the boiler gauge?

hot rod

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John_70

it is between 15 and 22

jeff_51

sounds like a bad relief

there isn't a valve between the expansion tank and boiler is there? If there is, is it open????

John_70

I was thinking that it may be a bad relief valve. I guess that the old expansion tank was weakest link and that the new tank is putting pressure on the relief valve. Does that make sense?
It is dripping about a quart an hour.
Thanks everyone for your help and suggestions.
John