Every couple of years I start getting some leaking from my blow off valve and it is because the bladderless expansion tank ( actually 2 plumbed together totally 60 gallons) becomes waterlogged. I have been told to simply drain and let it repressurize by the water feeder. It seems counter intuitive as this method partially fills the tank. Ideally would it not make more sense to pressurize the tank with air to the systems operating pressure at room temperature thus giving the entire volume of the tank for expansion?
Expansion tank
- Thread starter mark123
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maple1
Minister of Fire
Does it have a valve like this in the tank? Also there should not be any air vents or air purgers on the system or you slowly loose that air bubble that needs to be in the tank.
Usually about 1/2 of the tank gets filled as you pressurize.
https://s3.amazonaws.com/s3.supplyhouse.com/product_files/112013-Submittal.pdf
Usually about 1/2 of the tank gets filled as you pressurize.
https://s3.amazonaws.com/s3.supplyhouse.com/product_files/112013-Submittal.pdf
No valve like that. Simply 2 horizontal 15 gallon steel tanks totalling 30 gal. (Made mistake on volume in original post.) Placed in floor joists above the boiler. There is a simply auto air bleeder on the top of the boiler. Should the cap on it be tightened to seal it after piping air is removed? I have always left it open to allow for venting of any air that gets into radiant floor piping. E180 Woodgun has 80 gallon water jacket I believe. All 5 zones are radiant in floor pex.
maple1
Minister of Fire
There should be a way to isolate the tank from system, then drain water out of it. You'd also in turn need a way to let air in the top so water will be able to drain from it.
Ya I can isolate it and there are 2 valves...no problem draining it, just curious about adding air pressure rather than letting it half fill with water to pressurize.
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