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Circulator placement in relation to elbows etc.

Solid_Fuel_Man Member Posts: 2,646
Where is the best place (how far) for a circulator to be in a circuit in relation to flow restrictions like elbows Ts, flow-checks etc? Is it advisable to have an elbow 10 pipe diameters before the inlet of a circ? What about after? Is there a rule of X number of pipe diameters as best practice or is it irrelevant in small resi. systems with flows under 15GPM? How important is laminar flow and where in the piping in relation to the circulator?
Thanks in advance!
Serving Northern Maine HVAC & Controls. I burn wood, it smells good!


  • Zman
    Zman Member Posts: 7,588
    I like this one from ME
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • icesailor
    icesailor Member Posts: 7,265
    Zman said:

    I like this one from ME

    That's a good one.

    One that I have run into on occasion is covered, but not specifically.

    With a horizontal run, turning down to a boiler, keep the 4 pipe diameters distance. If you make it a close connection with a tee into a boiler with another boiler below it, the turbulence of the laminar flow water trying to change to circular will drop the pressure and the water may not flow into the second boiler. No matter how big a pump you install. It will never be shown on a drawing like that. Just in the agony of the install. Trying to get 10# of boilers and piping into a 5# space,