What size is 3/4in copper pipe

Discussion in 'Plumbing and Central Heating' started by zinnia48, 29 Nov 2006.

  1. zinnia48

    zinnia48

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    I have a sort of silly question, I know that 3/4in copper pipe is the internal diameter and that 22mm is the external, but what is the external diameter of 3/4in pipe. I have some mixed in my house and want to use mt calipers to meassyure to try and work out which is which. Or is there an easier way
     
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  3. Nige F

    Nige F

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    Callipers :eek: That`s what Forrest Gump wore isn`t it.........too technical for me , but the od of 3/4 is smaller than the od of 22mm. by about half a mill.
     
  4. BoxBasher

    BoxBasher

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    What material pipes are we talking about?

    Copper is different to lead, the wall thickness if different on MDPE compared to black alkethene. (Black alkethene varies from class to class)

    Give us a bit more info and you may get a bit more of a helpful answer.
     
  5. zinnia48

    zinnia48

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    I was interested in copper piping. Thx
     
  6. chrishutt

    chrishutt

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    ¾" imperial copper has an OD of 21.5 mm.
     
  7. zinnia48

    zinnia48

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    Thanx for that , should let me work out what the different copper pipe diameters are.
     
  8. Paul Barker

    Paul Barker

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    For us it usually stands out like a saw thumb, we can just see it.

    For you buy a 3/4 by 22mm end feed socket and try the small end on the pipe, if it won't fit it's 22mm.

    We have to have loads of the adapters as we mostly work in older houses most of which have some 3/4.

    The cold supply to the cylinder is and easy one, buy a new gate valve and buy a set of 3/4 olives. Change pipe size at the gate valve. In usual fashion drop the first olive down the back, go to van for another.
     
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