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Restriction to flow through 3/4" copper 90°?

JohnNY
JohnNY Member Posts: 3,287
in THE MAIN WALL
Any info out there as to how many feet of copper tubing is equal to the restriction through one 3/4" 90° elbow?



Thanks, all.
Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
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Comments

  • Mark Eatherton
    Mark Eatherton Member Posts: 5,858
    3 foot EDL

    EDL = equal developed length.



    ME

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  • JohnNY
    JohnNY Member Posts: 3,287
    Thanks, Mark.

    But where did you get that? The 3/4" thing is important to me right now, but it's probably good to know about other sizes and fittings.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting & Troubleshooting
    Heating in NYC or NJ.
    Classes
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,858
    I believe it was the CDA....

    Here is something from the engineering tool box.



    http://www.engineeringtoolbox.com/resistance-equivalent-length-d_192.html



    I think the 3 foot factor was based on the median allowable flow in a 3/4" pipe with a tight radius elbow. I suspect that the Engineering Tool Box data is worst case scenario.



    I found the CDA Hand Manual on line at http://www.copper.org/publications/pub_list/pdf/copper_tube_handbook.pdf



    They call out 2' of pipe length, on page 32, but don't say whether it is long radius or short radius.



    So, it is somewhere between 2 and 4 feet. That would be 3 feet :-)



    ME

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  • Brad White
    Brad White Member Posts: 2,399
    edited September 2010
    Here is a table

    you may find helpful, John. It is from the Copper Tube Handbook put out by the Copper Development Association. It is available on line but a paper copy is a nice thing to have. You may already have one! Being so published, I figure it is not a problem to post a sheet from it for you.



    EDIT: Mark already posted it, duh, my bad.



    Anyway, for 3/4" wrought copper elbows, I have an even 2 feet. It reflects the standard el we all know, nothing fancy.



    For an even more elegant look where this may be exposed, the ACR refrigeration els are very nice indeed and have less than one equivalent foot of pipe for pressure loss. They tend to cost more, but once in a while..'
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • Mark Eatherton
    Mark Eatherton Member Posts: 5,858
    Brad who?!?!?!?

    Hey podnah, Great to see your words.



    Don't be a stranger :-)



    ME

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  • Brad White
    Brad White Member Posts: 2,399
    Busted!

    Yessir, you got me. Rightly so.

    Thanks, Mark.
    "If you do not know the answer, say, "I do not know the answer", and you will be correct!"



    -Ernie White, my Dad
  • Gordo
    Gordo Member Posts: 857
    Why,

    'tis himself!  Brad, welcome back!
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
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    Baltimore, MD (USA) and consulting anywhere.
    https://heatinghelp.com/find-a-contractor/detail/all-steamed-up-inc
  • The Steam Whisperer (Formerly Boilerpro)
    The Steam Whisperer (Formerly Boilerpro) Member Posts: 834
    He must of heard us singing.....

    "Happy Birthday" and the authorities pleaded with him to get us to Stop!

    There was an error rendering this rich post.

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