Limit water velocity in copper pipe to 2 feet per second

SMD Posted By SMD, Mar 22, 2019 at 8:43 PM

  1. SMD

    SMD
    New Member 2.
    NULL
    

    Dec 12, 2017
    18
    5
    Loc:
    Batesville, IN
    Hi,

    Engineering Toolbox recommends limiting water velocity in a copper pipe to 2 feet per second if the temperature is above 140F. Does anyone follow this recommendation??

    Andrew
     
  2. E Yoder

    E Yoder
    Feeling the Heat 2.
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    Jan 27, 2017
    259
    39
    Loc:
    Floyd, VA
    That sounds low to me if you're hoping to purge air.
     
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  3. SMD

    SMD
    New Member 2.
    NULL
    

    Dec 12, 2017
    18
    5
    Loc:
    Batesville, IN
    It's very low. According to what I have read, copper is so soft at high temps that water can scour it (especially near joints, where there is more turbulence) causing failure.
     
  4. E Yoder

    E Yoder
    Feeling the Heat 2.
    NULL
    

    Jan 27, 2017
    259
    39
    Loc:
    Floyd, VA
    I've never seen it, but it sounds possible. 2-4 fps sounds more normal to me.
     
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  5. Chris Hoskin

    Chris Hoskin
    TarmSalesGuy 2.
    NULL
    

    Aug 29, 2008
    555
    71
    Loc:
    Lyme, NH
    I've heard 4fps more commonly, but 2fps makes sense in a low-loss header or if you are looking to minimize turbulence in a thermal storage tank.
     
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