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Solving poorly pitched pipe

Fizz Member Posts: 547
Last extension of supply main in single pipe(parellel system) is pitched wrongly. Wondering if a 1" copper(no,no) tubing draining into parallel return would help? See pix. Pipe in question is to left of wire, return is drop-down to right which runs parallel to supply, then drops at boiler. Radiator attached at end of supply main has moderate hammer toward end of cycle, and a rushing or flowing water sound afterwards.


  • Jamie Hall
    Jamie Hall Member Posts: 21,099
    No way to rehang the whole thing so it pitches properly? Any handy wet returns to drip into? It's kind of hard to tell from the picture -- but you may have trouble getting enough pitch on your new pipe to help much. And that new pipe has to be threaded iron -- as you note, no copper -- and no plastic, either. It will have steam in it.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Could you raise the last radiator, and therefore correct the slope?—NBC
  • Fizz
    Fizz Member Posts: 547
    No way to rehang pipe, nearest wet return is at boiler which isn't practical. Radiator is at highest point.
  • Chris_L
    Chris_L Member Posts: 317
    You may not need to rehang the whole pipe.

    What is the size of the pipe that improperly pitched? And have you identified the low point in it where condensate is collecting?

    Have you tried putting a hanger in that position and lifting the pipe up? You'd be surprised what a little push on a 1" pipe can do.
    EBEBRATT-Ed Member Posts: 13,433
    so your saying that the pipe to the left of the small wire it the hammer pipe? And the steam supply is coming from the right? Just trying to figure this out.

    If I am looking at this right cut a tee into the pipe where it hammers with the branch of tee looking straight down. 3/4" would be the minimum size 1" would be better. Drop out of this tee do to a level below the boiler water line. 90 over at that level until your underneath the steam supply pipe. 90 up and put a tee into the steam supply looking down and tie into that. Check the pitch on that steam supply and make sure that section is pitched back toward the main. This is a loop seal.

    But that is a lot of work.

    My first choice would be to rework/rehang that steam supply to make it work. Looks to me like it could be done with a little creativity
    JUGHNE Member Posts: 10,564
    IIWM, I would remove the insulation and raise the pipe up.
    If needed a little floor joist notching might be in order.
    But for more than an inch of notching, I would make a "sister sandwich" on the floor joist. That is putting a 2' length of 1/2" plywood the height of the joist on each side of the joist, centered on the pipe. Glue and screw the hell out of it. Then you can cut more out of the bottom of the joist ….maybe 2-3", depending upon the height of the joists.
    This is a guideline only....not scientific....but have done it and no problems. You are close to the end of the joists so it is not as if you are in the middle of the span.
  • Fizz
    Fizz Member Posts: 547
    Pipe in question is an 11/2", and is a new pipe put-in last May. Tech said that's best he could do with-out major pipe work. The pipe replaced had a greater downward pitch and a leak, thus replaced. The radiator attached is 2nd floor and already raised several inches, there's no more space to play with.
    PIpe is pard of a 20' run before it 90 degrees 11' to boiler where it drops below water line.
    Most recent service guy told me he has pipe-guy that's creative, so I will contact him to get some feedback.
  • Fizz
    Fizz Member Posts: 547
    Latest on piping: Pipe guy came yest, was very good and said best solution is to put a 11/4" tee, drop it down below water level and make it a wet return to boiler. That's what we agreed to. He considered a loop seal, and some other ideas, but he felt wet return is best. He wasn't pushy , very knowledgeble and reasonable. In the interim of the past month, also noticed a poorly pitced run of about 6' which he will correct again with some creative piping.
  • BobC
    BobC Member Posts: 5,401
    If it's ok with him, post his name so we can make use of his talent - it's becoming a rarity.

    Smith G8-3 with EZ Gas @ 90,000 BTU, Single pipe steam
    Vaporstat with a 12oz cut-out and 4oz cut-in
    3PSI gauge
  • Fizz
    Fizz Member Posts: 547
    Will check.
  • mikeg2015
    mikeg2015 Member Posts: 1,187
    Actually a loop seal would probably work too and allow the pipe to remain up high except the loop seal. If you never run over 2psi, a 5’ loop will work at that point in the header. I just replaced a loop seal today on a 2 pipe Moline system with a lower basement ceiling without enough fall for gravity returns. So the “dry” return was wet at the ceiling most of the way until it dripped to the boiler. Kept the pipes off the floor.
  • Fizz
    Fizz Member Posts: 547
    Piping done over week-end. Dropped 1" pipe from T installed at end of trouble pipe to floor and ran to boiler, tapping-into drip from return. Also re-piped poorly pitched run-out on short supply.
    Will test tonite for any issues.
  • Fizz
    Fizz Member Posts: 547
    Since above piping fix notice when t-stat calls for heat, boiler pressure runs between 1-2oz, and heat shuts-off by satisfying t-stat, prior to fix, the last few minutes pressure would rise to 15-20oz and shut-off on pressure at times.