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p/s piping question

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Brad White_150
Brad White_150 Member Posts: 29
in THE MAIN WALL
mentioned in various literature. From a balancing valve standpoint, 5 to 7 diameters straight run upstream and 2 to 5 diameters downstream are standard minimums depending on the manufacturer. 7D seems to be the most common upstream recommendation in AABC and NEB balancing guidelines.

In short though, the more the better.

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  • bovide_4
    bovide_4 Member Posts: 161
    do you need

    laminar flow before and after a pair of closely spaced tees?
  • Brad White_150
    Brad White_150 Member Posts: 29
    By laminar flow

    you mean a lack of turbulence, yes.

    It is a matter of degrees, but turbulence is itself a pressure drop, sort of like sibling rivalry in the backseat in a long car ride. :)

    If the turbulence creates enough pressure drop in the main, it could force/induce flow into the secondary circuit. How much depends on the degree.
  • bovide_4
    bovide_4 Member Posts: 161
    a rule of thumb would

    be, say 4 pipe diameters of straight, reamed pipe from a 90 degree elbow to the first tee, or greater?
This discussion has been closed.

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