NDT on Weld Overlaid Flanges & Fittings

So many unanswered questions in this post, it leaves me wondering whether a qualified Corrosion Engineer was even engaged in the decision-making process....

Depending on your application, and the severity of your corrosion issue (if one exists: you haven't made it clear whether the overlay is part of a Design-Spec, or if it is being attempted out of necessity due to corrosion problems) , you might NEED to perform some type of nondestructive examination before proceeding.

What kind of overall dimensions are involved, and what sort of defects (of what Critical Size) will you be concerned with...?

You may need any combination of nondestructive examinations to be performed (eddy current, ultrasonic, magnetic, radiographic, penetrant, etc) in order to divulge the information that you seek.

I may be off-base, but, it sounds to me as though you remain uncertain as to what it IS that you might expect..........(??)

Thanks for the response.

The overlay is part of the design spec. The pipeline size is 24" & is CRA cladded with inconel 625, hence we are procuring pipeline flanges & fittings (manufactured in accordance with MSS SP stds.) and then weld overlay with UNS N06625.

We have a spec. which calls for NDE by dye penetrant inspection & then ultrasonic inspection for evaluating the bond integrity after overlay. The flange spec. also calls for NDE examniation by MPI & UT. Hence i had this question whether prior to weld overlay any NDE is required...

"The flange spec also calls for NDE examniation by MPI & UT. Hence I had this question whether prior to weld overlay any NDE is required..."

Well ~ ...

I am certain that what you mean by this is : the MSS (manufacturing) Standard calls for both magnetic particle and ultrasonic examination of the finished product (flange).

It seems to me as though the question is "back-on-you".

When you procured these flanges, did you receive confirmation of NDE results on them from the manufacturer? (or, can they make those results available to you?) IF NOT, then it would appear that the burden is on *you* to see to it that it gets done.

I love the (ASTM) motto: "Standards make the pieces fit." This can apply NOT ONLY to a 'physical-fit-up', but also to the quality of being 'fit-for-service'....

Best Wishes ~

Hi, My response might be too late, but my company does overlay on a daily basis. For my experience, we always do NDE as per the required specs on the flanges after manufacturing, and then we do a UT, LP and MP. We do radiographic examination on the bond line. Hope this helps. You may e-mail me if you have any further question @ <email removed>

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Is NDT carried our prior to weld overlay or after?

After

Ron

In previous post, above, it was stated:

"...spec calls for NDE by dye penetrant inspection & then ultrasonic inspection for evaluating the bond integrity after overlay (...and...) The flange spec also calls for NDE examniation by MPI & UT (meaning: the original manufacturer of the flanges should be able to provide results of magnetic particle and ultrasonic interrogation of the products prior to shipping). Hence i had this question whether prior to weld overlay any NDE is required..."

Unless I am 'all-wet' , if the manufacturer cannot produce the reports stipulated above, then it is on the OP's shoulders to perform those preliminary examinations (UT & MPI) PRIOR-TO the weld overly, so as to insure the overall integrity of their finished product ... (and then ALSO to perform the post-overlay exams on the bond quaility / absence of shrinkage cracking, etc).