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Two Pipe Steam Problem

Steamhead Member Posts: 16,727
I'll bet you have an old Vapor/Vacuum system, and the main vents you speak of will let air out but not in. Do you know who made your system? You might be able to find manufacturer's names on the radiator valves, traps, or other gear that could help us identify it.

The cure would be to replace the Vacuum vents with standard main vents. The Gorton #2 vent has a large capacity and works very well on these systems.


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  • Peter Morris
    Peter Morris Member Posts: 1

    I'll try not to get too wordy, I have two boilers piped into one system (two pipe) with a dry and wet return. water kept spitting out of the last Main vent on the dry return, we spent alot of time re-piping the boiler to specs. (added a hartford loop and equiliser for each boiler). it previously had only one. skimmed and squiked several times. (cleaning out with white vineger after each treatment) Today , I noticed that it spits after the units cycle off on pressure.(set at lowest setting of 1/2 pound). I also notice that water comes through the top of the gauge glass when hot.
    after blowing down the LWCO, I noticed that when I opened the boiler drain it sucked air in.(there was water in the gauge glass) ....... Any suggestions?

    Peter Morris
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