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Single Pipe Steam: Wet Return/Hartford Loop/Equalizer pipe sizing

Just stumbled across a thread related to this subject on the "Main" board. I'm reposting my question here as it's better suited for "Strictly Steam". Does the drop down from equalizer, Hartford loop and wet return pipes want to be the same size? My system has a 1-1/2 x 1-1/2 x 1-1/4" T before the close nipple and 1-1/4" for the rest of the loop and around to wet return. Dry return is 2", reduces to 1-1/4" at an elbow at the end of the line and drops down about 40". In peak season, condensate doesn't return to the boiler quickly enough and causes occasional LWC activation. One tech theorized that the upsizing the 1-1/4" pieces to 1-1/2" could alleviate the problem by eliminating a flow problem. Thoughts? Pics of the system attached.


  • Danny Scully
    Danny Scully Member Posts: 1,424
    edited September 2019
    1-1/4” can handle quite a bit of condensate. If you think the flow is inadequate, investigate the possibility of flushing the returns (which only appear to be a few feet long). But it sounds more likely that the LWCO is tripping because of surging. I would give the boiler a good skim.