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Closely spaced tees

Unknown
Unknown
in THE MAIN WALL
Why two? Insurance? FYI, so far, unless it expands, the HW plant would need 120 GPM under full load. Will I find a pump that big with IFC? (I'm looking for my charts now...) ;)

Comments

  • Unknown
    Unknown
    Does...

    Closely spaced tees work for 8" pipe or will I see some flow?
  • Brad White
    Brad White Member Posts: 2,399
    Same principle

    scaled up or down.

    If the flows are really tiny, I could see some internal convection within the pipe volume, but for a flow rate proportional to the pipe size, the closely spaced tees properly set up should work as well as smaller pipe sizes with which you may be more familiar.

    Is there a particular job on which you have a concern?

    I have one starting up soon, 6-inch mains which I expanded to 8-inch for the tees. Two 358 GPM boilers feeding a school via P/S tees.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • Steve Ebels_3
    Steve Ebels_3 Member Posts: 1,291
    6\" Mains

    Ideally, your T's should be 24" or less. I have used the rule of 4 pipe diameters on every pipe size I ever encountered. No problems. What's the flow in the primary and what the flow in the secondary
  • Unknown
    Unknown
    Thanks...

    Not sure of any numbers yet, I'm looking at adapting the air to water heat pumps to a 700 ton chilled water system and thinking of just teeing it into the return main with close spaced tees. The building uses electric duct heaters. One A/H totaled 1.2 million BTUH between preheater and reheater and there's a few A/Hs. They want to convert to gas for some reason... ;)
  • hot_rod
    hot_rod Member Posts: 23,380
    I'd still like to see

    gravity gates, AKA check protection on both S&R. Maybe a circ with intergral check on one side and a stand alone check or flo-check on the other side.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Unknown
    Unknown
    3\"...

    pipe. Piece o' cake! Slice of pie. Walk in the park...

    ;)
  • hot_rod
    hot_rod Member Posts: 23,380
    Doubtful on the IFC

    in that size circ. Ghost flows are what you want to keep in check. Early on P/S without checks was promoted. then one check. then one check and under slung take-offs. Really two checks prevent any un-wanted flow and are easier to put in on the initial installation.

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Unknown
    Unknown
    Absolutely!

    (in my best Rocky voice). Much easier to do it at the get go. 3" is nice but I like 4" better. Call me the king of overkill but it's got a ways to go. It'll keep my pump size down. Thanks HR!

    m
  • Paul Rohrs_7
    Paul Rohrs_7 Member Posts: 173
    My wife

    resembles a closely spaced Tease.....

    Film at eleven. I'll be sleeping on the couch at 11:01.

    Pablo
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