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Pipe pitch off of boiler

foresthillsjd Member Posts: 110
Hi everyone, one pipe steam here. I was looking at my boiler the other day, and am planning on neatening up the insulation at the neater and insulate all the supply pipes in the basement, but I noticed one pipe is pitched down away from the boiler. Is it supposed to be like that? How would the condensation drain from the bottom of that pitch?


  • Jamie Hall
    Jamie Hall Member Posts: 18,947
    Good question. But the picture doesn't go far enough. What's at the other end of that pipe? A pipe pitched that way is quite common -- it's a parallel flow main -- but at the other end there should be a vertical pipe, referred to as a drip, which goes down to a wet return back to the boiler.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • mikeg2015
    mikeg2015 Member Posts: 1,187
    Need more info. If it’s a counterflow and that riser goes off to feed part of the house, then it need a drip back to the boiler.

    If it’s parallel flow and their continuous around the basement and becomes the return, then that’s normal. Can have multiple parallel flow headers. On 1 pipe parallel flow, the main is also the return and all the laterals are then all counterflow.