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cv / feet of head

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ralman
ralman Member Posts: 231
in THE MAIN WALL
The feet of head loss for a cast iron baseboard is very low compared to the pipe and fittings.

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  • IZZY
    IZZY Member Posts: 59


    I'm trying to establish a true head loss on my system so I can put the right pump in. Some of the system components' paperwork gives cv values. Anybody know how I can convert this number to head loss in feet of head?
    Thanks.
  • ALH_4
    ALH_4 Member Posts: 1,790
    head loss

    head loss in feet = (1.52*gpm/Cv)^2

    -Andrew
  • marc
    marc Member Posts: 203
    conversion

    the CV value is the gpm thru the device that will create a 1 psi pressure drop. example, 4.5 cv means that at 4.5 gpm you will have a 1 psi drop thru the device. 1 psi = 2.31 ft/head. marc
    HydroNiCK
  • ralman
    ralman Member Posts: 231
    Does that formula work for cast iron baseboard?

    A manufacturer's chart lists an 8' CIBB at 2.68 pressure drop in inches of water at 2000 lbs/hr(4 GPM) flow rate. I was trying to convert to feet of head. Is 2.68 X 2.31 = 6.19 A correct method for figuring the feet of head?
  • ALH_4
    ALH_4 Member Posts: 1,790
    loss

    Just divide 2.68 by 12 to get 0.22 ft of head

    -Andrew
  • IZZY
    IZZY Member Posts: 59


    Thanks, just what I was looking for.
    Izzy
  • Empire_2
    Empire_2 Member Posts: 2,340
    IZZY

    B&G has a very nice "System Syser Calculator" that can be obtained from their web sight. I think you would love it. Would answer all of your questions.

    Mike T.
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