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sch 31 ? confused !!!

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  • sch 31 ? confused !!!

    Hey guys i have a question concerning a pipe test i have tommorrow.The staffing company i got the test through says the contractors test is a 4 inch sch 31 tig in stick out . Ive welded plenty of pipe but i have never heard of sch 31 pipe.Ive looked in my fitters book and see a sch 30 pipe but it its 8 inch and up. This is a carbon test not stainless i think stainless has a sch 30 in a smaller size then 8 inch.Do u guys think they may b mistaken and it is sch 40. I have always tiged sch 40 all the way and sch 80 was tig in stick out. Any advice or thoughts is greatly appreactied.

  • #2
    They are clearly mistaken. A two inch tig all the way out and a 6 inch tig root/7018 fill and cap is the norm but a 4 inch can go either way. In any case no such thing as sch 31 or 30 for that matter.
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