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  1. Division

    code for boring (machining) fittings from a sch to a sch ?

    Is there a code for this. We have a WPB B16.9 16" 90` Elbows which have been bored from sch 80 to sch 40. The angel of the taper bore is 39, which in my opinion is to great for the flow. A colleague think that the angle of the taper bore shall be 17,5 and another think there is a...
  2. Division

    Out Of Roundness / Ovality ASTM A999-2001 Volume 01.01

    Hello, I am familiar with Ansi B16.9, where the out of roundness is the sum of absolute values of plus an minus tolerances. I have a 10 inch pipe (OD 273,05mm) with Wall thickness 4,19mm. Can anyone tell me how to understand the out of roundness of ASTM A999. It says; " The differents in...
  3. Division

    Ansi B16.9 2001 vs Ansi B16.9 1993

    I just received Ansi B16.9 2001 Revision. Are there anyone knowing if there are some "major" differents vs Ansi B16.9 1993 revision ?

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