CVN testing expiry

Date 02-01-2009 16:22 Edited 02-01-2009 16:30

Do impact tests on PQR stay valid indefinitely? (D1.1) A PM was reviewing some WPS for a current project, and they were qualified in 1999, and his question was, "don't Charpy tests expire after a while"? I think not, and I cant find anything in '04 D1.1. (my '06 and '08 are in the truck)

By 3.2 Inspector (***)

Date 02-01-2009 17:25

Did he give a reason for his question?
It seem to be a very very strange question to me.

To answer your question: No a charpy test does not expire.

3.2

By hogan

Date 02-02-2009 15:45

D1.5 lists 36 months for Fracture Critical and 60 months for all others. Maybe he got them confused.

By 3.2 Inspector (***)

Date 02-03-2009 10:00

So the test is not valid 60 months after it has been performed?

3.2

By js55

Date 02-03-2009 17:25

I'd certainly like to hear the answer to that as well. As well as if anybody knows the metallurgical or mechanical justification.

By HgTX

Date 02-04-2009 20:49

The D1.5 restriction means that yes, the test expires 60 (or 36) months after it was performed.

There's not a whole lot of justification for it. There has been discussion of removing it. But there's paranoia about removing it.

The only reason I could think of to keep it is that it's possible that the formulation of the consumables might have changed just a wee bit over the years, not enough to change classification, but enough to change performance.

My prediction is that the non-fracture-critical limit (60 months) will be gone by the next D1.5 edition or the one after that. Fracture-critical (36 months), less likely.

Hg

p.s. Note to those who recognize me: I disagree with the requirement, but I plan to continue to enforce it; I go along with the AWS democratic code-writing process. So don't get any bright ideas.

By js55

Date 02-04-2009 21:18

thanks