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Acceptance criteria for pitting corrosion
2

Acceptance criteria for pitting corrosion

Acceptance criteria for pitting corrosion

(OP)
Dear experts,
I would be grateful if you could help me if we have acceptance criteria for pitting corrosion on steel plates used in pressure vessels?

RE: Acceptance criteria for pitting corrosion

None

RE: Acceptance criteria for pitting corrosion

Use API 579 locally thin area evaluation.

RE: Acceptance criteria for pitting corrosion

Are you asking about pits in new plate to be used for PV fabrication? Or PV's in service?

RE: Acceptance criteria for pitting corrosion

In addition to API 579/ASME FFS-1 Part 6 Pitting evaluation, try the National Board Inspection Code methodology, If it is still in the NBIC.

RE: Acceptance criteria for pitting corrosion

It´s simple. If all pitting depths are less than corrosion allowance the pressure vessel can return to normal service. if not see API 579. Allways see API 579
Regards
r6155

RE: Acceptance criteria for pitting corrosion

(OP)
weldstan, what I meant to say was about new plate before fabricating of pressure vessel

RE: Acceptance criteria for pitting corrosion

For new plate you refer to the material specification and associated tolerances and workmanship.With that said, you have to inspect the incoming plate and ensure the wall thickness of the new plate beneath the pitted surface, which should be removed, still remains above the required minimum design thickness. Otherwise, I would reject the plate.

RE: Acceptance criteria for pitting corrosion

See metengr.

RE: Acceptance criteria for pitting corrosion

(OP)
metenger are we allowed to repair pitting discontinuities by welding and grinding? either above min thk. or beneath.

RE: Acceptance criteria for pitting corrosion

Yes, if you have accepted the plate with pits, you issue a nonconformance and weld repair, as necessary. Why in the world would you accept such material?

RE: Acceptance criteria for pitting corrosion

(OP)
because those are supplied in a difficult way and our company doesn't want to discard them as much as possible.

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