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What accounts for different PEX ID Measurements?

McMaster
McMaster Member Posts: 28
Hello,

I have here PEX from two different manufacturers. One is Infloort Heating Systems BPEX which is installed in my house, the other Rehau, PEXa which I bought part of a used coil (2004) . Both claim to be 3/8". The inside diameters are obviously different as you can see in the picture. The Rehau is about .025 smaller in diameter. 

Any ideas why this might be?

<img src="http://i567.photobucket.com/albums/ss118/gruni42/3_8inchpex.jpg" width="500" height="304" alt="" />

Comments

  • kcopp
    kcopp Member Posts: 3,819
    prob...

    just a slight variation in the extruding machines.
  • McMaster
    McMaster Member Posts: 28
    common?

    How common is this between different brands and sizes (1/2", 1")?
  • Ironman
    Ironman Member Posts: 6,555
    I'm not an Expert...

    On the chemistry of Pex, but I can tell you that there's a lot of difference between type A and type B Pex.



    Type A (Rehau) is expandable because it has "memory". In other words, it will return to its original shape and size after expansion. Its life expectancy: up to 200 years.



    Type B is another story. Its not expandable and has a life expectancy of 25 years. Usually comes from china.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • hot_rod
    hot_rod Member Posts: 15,023
    edited October 2012
    SDR

    is one of the listings that should be on the tube. I suspect the extruder just went a bit out of tolerance.



    I know one company that builds a universial pex fitting that can accommodate tube with ID or OD tolerance issues. The inner part has a taper and dual o-rings, the "olive" or ferrule is segmented to compensate for out of OD or slightly oval shape.



    hr
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
This discussion has been closed.