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Old Steel Expansion tank
vicki1990
Member Posts: 2
How do you add air to an old steel expansion tank? The expansion tank doesn't not have an area where I can read the pressure but I do have a compressor and I can add air to it.
I drained water from it today and i opened one of the plugs but it doesn't seem to suck air rather than push it out. Was weird. Perhaps it's an old junk. Thanks for your help
Here is a similar old steel tank I have.
I have one of these guys:
I drained water from it today and i opened one of the plugs but it doesn't seem to suck air rather than push it out. Was weird. Perhaps it's an old junk. Thanks for your help
Here is a similar old steel tank I have.
I have one of these guys:
0
Comments
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I have done this before
https://forum.heatinghelp.com/discussion/comment/1620527#Comment_1620527Edward Young Retired
After you make that expensive repair and you still have the same problem, What will you check next?
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I have read your post and saw your diagram about the expansion tank; i do not believe my expansion tank SUCKS any air but rather blow it out; I was thinking of introducing air via compressor to it. am I missing something?EdTheHeaterMan said:I have done this before
https://forum.heatinghelp.com/discussion/comment/1620527#Comment_16205270 -
You drain the tank completely empty when it is valved off from your system. Then close the drain and open the valve to the system and bring the system up to pressure. That's all there is to it.Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England1 -
Hi Jamie! I did that but when I watch some other videos I notice that whenever you drain the expansion tank you would need to allow air back in; once you open that tiny valve, the expansion tank sucks air IN. My expansion tank blow air out; I did what you said earlier but my pressure keeps going back up again, every time I drain the tank the way you said to do. thanks for the help.Jamie Hall said:You drain the tank completely empty when it is valved off from your system. Then close the drain and open the valve to the system and bring the system up to pressure. That's all there is to it.
Vicki0 -
@vicki1990
@Jamie Hall is correct. Just drain the tank when it is completely empty close the drain valve. Open the valve that connects the tank to the system and leave it all the way open. The tank will be full of air and the water will enter. Add enough water from the system fill valve (city water to bring the system pressure to 12-15 psi.
The tank is supposed to be 1/2 air and 1/2 water which it will be.
It's not supposed to be 100% full of air
You only need to drain the tank if it is waterlogged (100%) full of water. If you have any automatic air vents on the system remove them and install manual bleeders0
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