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Up Topic Welding Industry / Inspection & Qualification / UT General question
- - By mktarby Date 09-30-2008 18:19
We need to have a SS chamber UT inspected.  Mostly full pen corner welds, with some full pen welds between wall & flange.

We will be hiring a UT inspection service to do the inspection on-site.  We want to spec out a "meaningful" inspection criteria that is also the least stringent (if that makes sense).  Any thoughts from the UT gurus?

Thanks;
Mark
Parent - - By kipman (***) Date 09-30-2008 22:30
Is this thing built in accordance with any sort of code, spec, or other standard?
Mankenberg
Parent - - By mktarby Date 10-01-2008 02:11
The fabrication is using the ASME Boiler Code as a guideline, although it is not a pressure vessel (its actually a vacuum chamber).
Thanks.
Parent - - By kipman (***) Date 10-01-2008 12:18
Why not do a proof test then?  Pull a vacuum on it (maybe 1.25 times working vacuum) and see if it holds.  Stand back during the test.
Mankenberg
Parent - - By mktarby Date 10-01-2008 13:21
It is a large replacement chamber, with no door and multiple ports.  There is no way to pull a vacuum on the chamber itself, but we have on the water jacket (double walled chamber).  Customer is requiring UT of certain welds.
Thanks again
Parent - - By kipman (***) Date 10-01-2008 14:25
It would seem to me that if it has holes in it (ports) then it should be possible to pull a vacuum (maybe using a venturi effect).  Anyway, if I was in your shoes I would approach the client for their opinion on the matter.  By the tone of your post, however, I would guess that you've already done that. 

I would suggest that since you used ASME (I would guess Section VIII) as a guideline for fabrication, you propose ASME VIII also for inspection.  UW-50 might provide some guidance here - you would only have to look for cracks (but it requires 100% examination of the listed welds).  If that doesn't fly UW-52 would seem to be appropriate based on your statement that "customer is requiring UT of certain welds" - that could be interpreted as spot examination.
Mankenberg
Parent - - By mktarby Date 10-01-2008 14:37
Thanks you kindly.  I'll go pull those docs.
Mark
Parent - By Nanjing Date 10-01-2008 23:44
I believe UT testing of austenitic stainless steels with conventional shear waves probe will give unreliable results. Special probes are available but you would really need a specialist to do it. Penetrant testing would be the best option.
Parent - By CWI555 (*****) Date 10-02-2008 11:16
To give a proper answer, we need to know specific materials and configuration. You've mentioned a wall to flange weld, which makes it almost a promise that your going to require as a minimum refracted longitudinal inspection. That will take a specialized techique. I doubt very seriously you'll get anything of value out of standard UT techniques; however based on your limited explaination, I would say it can be done.
Up Topic Welding Industry / Inspection & Qualification / UT General question

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