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Three Rads No steam in One pipe system

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DaBernie
DaBernie Member Posts: 1
in THE MAIN WALL
I have three rads in a one pipe system on the first floor of a four story building that are not getting any steam. The owner has changed rads and vent valves to maido-mists No.c. There is also new rad valves. there is no other complaints in the building. the piping appears to be clear of obstruction.  Please help

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  • BobC
    BobC Member Posts: 5,479
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    Piping

    Are these radiators all on the same steam main? Are they at the end of that main? There should be a main vent towards the end of the main, is the pipe the vent connects to hot? If that main air valve is clogged or partially clogged it may not be allowing the steam to make it all the way down the main.



    Check the piping in the basement to see if it slopes towards the boiler and also check to see if there is a sag in the piping. Depending on the type of single pipe steam you have, the piping will slope back towards the boiler (counterflow) or towards the return pipe (parallel flow) at the end of the main(s). Your eyes can deceive you, use a level. Also make sure the three radiators are slightly pitched back towards the radiator input valve.



    Bob
    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
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