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ASME section II part A

ASME section II part A

ASME section II part A

(OP)
Hi all, I have a query regarding thickness tolerance on SA-312 and SA-358 welded pipes.
For SA-312 welded pipes, the under tolerance on thickness is 12.5% of nominal wall thickness and for SA-358 welded pipes the under tolerance thickness is 0.3mm.
Now, as I understand the raw material is the same i.e SA 240, so why are the tolerances on thickness different for the same raw material being used?

RE: ASME section II part A

Different fabrication methods - roll formed from SA 240 and fusion welded (SA 358) versus seamless or long seam welded with no filler metal added (SA 312).

RE: ASME section II part A

(OP)
Thanks metengr, but still, welding processes should have no effect on the thickness tolerances.

RE: ASME section II part A

Manufacturing method does, just like metengr explained. Take his word; its the best advice youll get here.

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