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    aaftab52's Avatar
    aaftab52 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Dec 3, 2008, 09:40 AM
    Process Piping
    What is the diffrence between tube & pipe?
    amsteube's Avatar
    amsteube Posts: 75, Reputation: 6
    Junior Member
    		  
    #2

    Dec 3, 2008, 09:54 AM

    A pipe is a vessel - a tube is structural.

    A pipe is measured ID - a tube is measured OD.

    How they are measured... Pipes are measured ID or inside diameter because they are vessels. Tubes are measured OD or outside diameter because they are structural.

    Hope this helps.

    Aaron
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #3

    Dec 3, 2008, 12:31 PM

    I don't buy the above answer at all.

    Tubing is usually measured in NOMINAL ID UNLESS it's refrigeration tubing, then by actual OD. Example: The 1/2" copper tubing used for water is 5/8 OD. The type like K or L determines the wall thickness. Many people like to call this pipe, but it's really tubing.

    Pipe is measured in NOMINAL OD. The schedule dtermines the wall thickness. This allows the same dies to be used for both say 2" schedule 40 and schedule 80 pipe.

    See: Dimensions of Pipes and Tubes

    Go to a hardware store and ask for a 3/4 copper sweat elbow and go into a refrigeration supply house and ask for a 7/8" elbow. You'll get the same thing.
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