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Thread: How Many Gallons Per Foot?

  1. #11
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    Quote Originally Posted by Speedbump View Post
    Not all 3/4" pipe has exactly 3/4" ID. If your really going to use this method, you should actually measure the pipes ID.



    The piping is the old gray 3/4" pre-PEX pipes. (circa 1986)
    I mentioned this in the 1st post of this thread.
    I did NOT measure the I.D. of this piping.
    Do you know offhand what it may be?
    Last edited by Stayouttadabunker; 12-17-2011 at 04:18 PM. Reason: added information to post...

  2. #12
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    I have no idea, that's why I recommended measuring it.

  3. The Following User Says Thank You to Speedbump For This Useful Post:

    Stayouttadabunker (12-17-2011)

  4. #13
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    I'm happy with my guess...
    I'm not a rocket scientist and it's good enough for me.

    As for your suggestion...Thanks, but I guess I should have measured the I.D. before I put it all together?
    I don't feel like taking it apart right now while it's full of hot anti-freeze, 11 degrees outside and working fine. Nooo....

  5. #14
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    11 degrees outside and working fine. Nooo....
    That's why I live in Florida.

  6. #15
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    3/4" PEX would have an ID of .671"

    But Grey is an indication that you have Polybutylene...

    PEX is an SDR-9 tubing, and Polybutylene is an SDR-11 tube so the ID will be larger than PEX...
    The OD will be the same for both because it is "Copper Tube Size"
    Last edited by Redwood; 12-17-2011 at 08:14 PM.
    I stayed at a Holiday Inn Express last night.
    Now I can Plumb!

    For great information on the history of sanitary sewers including the use of Redwood Pipe
    Visit http://www.sewerhistory.org/
    Did you know some Redwood Pipe is still in service today.

  7. #16
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    electric heat

    Sir,

    How much is you electric bill in a winter month in NY? Do you also heat your domestic hot water with electricity?

    Tom

  8. #17
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    Hawkins - what the utility charges up here per kwhr is high, but there was a blurb that they are giving a discount of 6% next year. most places here are listed as SC-1 non heat electric. you don't see many off peak metering here.

  9. #18
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    By the way, here in the northern part of New York State - we went down to a cool 3 degrees above zero at around midnight.
    Electric windows start to stick on car doors...lol


    And yes, I have the old gray PB poly 1980's "pre-pex" tubing in the floor slabs.
    I still have no idea what the I.D. is though....couldn't find it anywhere.

  10. #19
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    look at the printing on the pipes - are the pipes light gray like pvc electrical tubing or a dark gray pipe. the dark gray can be threaded with pipe dies. the pipes can be schedule 40 or 80.

  11. #20
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    OKay
    I went downstairs, removed a section of insulation, and took some pics.
    Looks like the old SDR-11 stuff...uh...lotsa printing on them...lol...>>>


    BOW '8' 3/4" ( CT8 ) SUPER-FLEX PB2110 SDR 11 100 PSI AT 180 Degrees [NSF PW] <FM> ASTM D3309

    Click on any photo to enlarge if needed...>>>
    Last edited by Stayouttadabunker; 12-18-2011 at 08:07 PM.

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