B31.3 Plate Shell
B31.3 Plate Shell
(OP)
does B31.3 allow the designer to use A 516-70 as a rolled plate shell without complying to ASTM A 672?
the stress tables show pipe A 516-70 Spec A672 and then another listing for plate A 516-70. is the plate reference used only as flat plate?
the stress tables show pipe A 516-70 Spec A672 and then another listing for plate A 516-70. is the plate reference used only as flat plate?





RE: B31.3 Plate Shell
RE: B31.3 Plate Shell
Rick
RE: B31.3 Plate Shell
RE: B31.3 Plate Shell
Rick
RE: B31.3 Plate Shell
I just want to warn that your fittings as well as the pipe need to be suitable for your design conditions. You may need to specify heavier wall fittings or purchase fittings with a specified minimum wall as opposed to a nominal wall.
NozzleTwister
Houston, Texas
RE: B31.3 Plate Shell
Rick
RE: B31.3 Plate Shell
I looked, and I don't have B31.3 Interpretations dating back to 1990. However, I would suggest your review ASME SA-672 in detail. This specification covers steel pipe fabricated from pressure vessel quality steel plate.
Per B31.3, for pressure retaining components, you can have the shell made from pipe using this Specification (SA-672) or you can roll and weld the shell component from SA-516 Grade 70 steel plate; the Code permits this. The only difference is that you will need to verify adequacy of design (minimum wall thickness) for the shell plate and follow the NDT requirements for welding the shell plate using B31.3.
If the shell was supplied as long seam welded pipe under the SA-672 Specification, as long as the wall thickness meets design requirements for B31.3, this is acceptable. The NDT of the long pipe seam has already been performed under SA-672.
RE: B31.3 Plate Shell
What you are saying seems obvious but some customers want proof from the code. I have located the Code Interpretation 8-36 where the code committee addressed exactly this issue and endorsed the use of plate outside of A672.
Thanks, case closed.
Rick