Gas Pipe sizes?

Discussion in 'Tech/Mech General' started by Craig Rogers, Feb 15, 2012.

  1. Craig Rogers

    Craig Rogers Read Only Funster

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    Just a quick question.

    When quoting a low pressure Gas Pipe size of either 8mm or 10mm. Is this the internal bore not the outside diameter?

    I haven't measured the pipe, but looking at our pipe it looks around 10mm but noticed it feeds a Manifold (I think Truma) that has the same size inlet and outlets. I don't believe there is a 10mm in and 10mm out available, so I am assuming the pipe is 8mm internal bore.

    What possibly does give it away is the pipe is stamped with SW/8x1 which I pressume it means 8mm but thought I'd check with funipedia :)Laughing:) first.
     
  2. pappajohn

    pappajohn Funster Life Member

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    not sure if its the same but steel water plumbing pipes are measured externally

    1-1/8th steel water pipe is 3/4" internal
     
  3. aba

    aba

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    i would assume from the sw/8x1 that it is 8mm diameter 1mm wall pipe.
     
  4. Craig Rogers

    Craig Rogers Read Only Funster

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    That was my thinking.:thumb:
     
  5. spannermanwigan

    spannermanwigan Read Only Funster

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    perhaps this will clarify( see lower right of page)

    http://www.gasproducts.co.uk/acatalog/8mm_x_10_Metres_Copper_Tube.html

    regards
    Steve
     
  6. vwalan

    vwalan Funster

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    hi, copper tube microbore coil 8mmO.D.x0.6mmx10mtr en1057-r220-blue label written on a new pack of 8mm. i just bought .and the 10mm is 10mmO.D. i just checked.
    hope that lets you know.
    both euro accesories and an old reimo catalogue show 8mm and 10mm in all the manifolds so imagine they will be available here . .
     
  7. pappajohn

    pappajohn Funster Life Member

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    well now i know, copper is sized externally the same as steel pipe. :thumb:
     
  8. Craig Rogers

    Craig Rogers Read Only Funster

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    Hmm confussed.com!

    Labelled 8x1, but it seems like it maybe 10mm. 'Spose it could be due to pipe is plastic coated that it appears to be so big.

    I measured it and it's just over 10mm. So I guess it's 10mm.

    Thanks all!
     
  9. Craig Rogers

    Craig Rogers Read Only Funster

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    :Doh:

    If you're gonna do a job........

    Not being able to let it rest, I decided to measure it with some calipers rather than hold up a tape measure.

    It is 8mm......... Why I didn't do this in the first place, I'll never know.:RollEyes:
     
  10. pappajohn

    pappajohn Funster Life Member

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    micro gas pipe is usually 6 or 8mm........central heating microbore is 10mm


    it will be 8mm covered by a 1mm thick plastic coating.

    the coating needs removing to make a connection
     
  11. Craig Rogers

    Craig Rogers Read Only Funster

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    :thumb: Which is probably the 8x1 stamp.

    8mm pipe with a 1mm plastic coat.
     
  12. pappajohn

    pappajohn Funster Life Member

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    i reckon the 1mm is the pipe wall thickness so internal size will be 6mm plus 1mm either side.
    the coating wont be mentioned in the sizing as it must be removed anyway to fit the 8mm olive and nut
     
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