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Distance between fittings and circulator

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Is there a minimum distance between say a 90 and a circulator, on a oil fired boiler?

Comments

  • hot_rod
    hot_rod Member Posts: 22,246
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    Best practice is 12D, 12 pipe diameters up or down stream. So 12" for 1" pipe or tube.

    No flow restricting devices up stream of a circulator. Air separators are fine upstream.

    But even pump manufacturers break this practice by putting check valves in the discharge of the volute. Go figure.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
    PC7060
  • Alan (California Radiant) Forbes
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    If space is a concern, I’d pay more attention to the suction side of the pump, i.e. 10 diameters of straight pipe. 
    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • hot_rod
    hot_rod Member Posts: 22,246
    edited October 2023
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    12D, 12 pipe diameters, so for 1” pipe or tube 12” is best practice on both sides of a circ

    no check valve or flow restrictive devices at the suction

    But even the pump manufacturer break this rule with IFC checks  in the pumps
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Erin Holohan Haskell
    Erin Holohan Haskell Member, Moderator, Administrator Posts: 2,321
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    @Orangecoleahh I've merged your duplicate posts into one here to prevent confusion. Thanks.

    President
    HeatingHelp.com

  • neilc
    neilc Member Posts: 2,708
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    Hi @Erin Holohan Haskell
    there may be a glitch in the interwebs,
    This is a second "merge" where I only see about 5 messages of this thread,(happened on another where I tagged you on the duplicate threads),
    Where is all the starting messages to this thread?
    known to beat dead horses
  • Erin Holohan Haskell
    Erin Holohan Haskell Member, Moderator, Administrator Posts: 2,321
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    @neilc, I usually merge the posts and then remove anything that is duplicate, like the OP's initial question repeating. I'll keep an eye out for glitches. Thanks!

    President
    HeatingHelp.com

  • neilc
    neilc Member Posts: 2,708
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    @Erin Holohan Haskell
    ty, for all you do,
    known to beat dead horses
    Erin Holohan Haskell
  • RobertHoward
    RobertHoward Member Posts: 1
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    For optimal performance and to reduce strain on the circulator, maintain at least 12 inches of straight pipe between fittings like a 90-degree elbow and the circulator on an oil-fired boiler system. This helps ensure smooth flow and efficient operation
    PeteA