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Two Pipe System

MP1013 Member Posts: 17
I have a 2 pipe system with the rear and front of house have there own feed an returns.Upon checking system found some one had raised pressure up to 8 and cut out at 11 thinking it would help get heaT to radiators. This system is for the second floor only of a 2 story house. Needless to say all the traps failed in the closed position. I cant see the front of the house because it is all sheetrocked but in the rear I see a 1" steam main that goes up and along the ceiling for about 8" than goes up into the sheet rock. right next to it a 1" return line comes down thru sheetrock runs across and drops into a wet return. which also picks up front of house. It than goes into a Hartford Loop and back into boiler. I lowered the pressure so that the boiler operates between 1/2#and 1 1/2# . The boiler now builds pressure right awaay and shuts down beacuse the steam has no place to go because the traps have failed. This is a new system and I believe it has been piped wrong. . I want to make sure just how it should be piped . There is no F&T trap anywhere here and I believe it is required as well as a vent on the dry return. Any help would be appreciated      


  • Jamie Hall
    Jamie Hall Member Posts: 23,442
    Please avail

    yourself of "A Steamy Deal" (find it under shop on this site); it is worth it's weight in gold, and you will find a mine of information on how two pipe steam should be set up.

    Pity about the traps, what?  First thing to do is going to be to replace them...

    An F&T is not always required -- review "The Lost Art" on the subject when it comes.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
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