You can hang your hat on the fact that overlap is a special case of incomplete fusion at the toe of the weld. Location, location, location.
If there is a provision for penetrant testing, you will have no problems rejecting the condition based on the size of the resulting stains.
I don't have a copy of Section VIII handy, so you'll have to do the digging to find the clauses on which to base your assessment.
A close look at the fabricator's QC manual may provide a suitable basis, but most are written without going into great detail on acceptance criteria.
I had a similar problem when I was the fabrication manager with a manufacturer of pressure vessels. Our QC and our AI were our worst enemies. They were rejecting welds based on 'I don't like it'. They literally checked the vessels with cotton gloves to catch the most minute amount of spatter on what were 'throw-away' housings. I admit they were the prettiest damn vessels I've seen. I challenged the AI and our QC on several occasions because the welds they were rejecting were perfectly fine. Their response was they had to meet customer expectations. I responded that our vessels were used in the bowels of the greasiest, dirtiest, nastiest places known to man. No one could even find them after a few days of use.
The situation changed dramatically when we started to subcontract the fabrication based on the requirements of Section VIII alone. Then all I heard from our QC was, 'We would never accept that.' My response was, 'And that's why we aren't building vessels here any longer. You put the fabrication shop out of business with your nit-picking that meant nothing to our customers!'
Life goes on.
Best regards - Al
If there is a provision for penetrant testing, you will have no problems rejecting the condition based on the size of the resulting stains.
I don't have a copy of Section VIII handy, so you'll have to do the digging to find the clauses on which to base your assessment.
A close look at the fabricator's QC manual may provide a suitable basis, but most are written without going into great detail on acceptance criteria.
I had a similar problem when I was the fabrication manager with a manufacturer of pressure vessels. Our QC and our AI were our worst enemies. They were rejecting welds based on 'I don't like it'. They literally checked the vessels with cotton gloves to catch the most minute amount of spatter on what were 'throw-away' housings. I admit they were the prettiest damn vessels I've seen. I challenged the AI and our QC on several occasions because the welds they were rejecting were perfectly fine. Their response was they had to meet customer expectations. I responded that our vessels were used in the bowels of the greasiest, dirtiest, nastiest places known to man. No one could even find them after a few days of use.
The situation changed dramatically when we started to subcontract the fabrication based on the requirements of Section VIII alone. Then all I heard from our QC was, 'We would never accept that.' My response was, 'And that's why we aren't building vessels here any longer. You put the fabrication shop out of business with your nit-picking that meant nothing to our customers!'
Life goes on.
Best regards - Al
BPVC Section VIII-Rules for Construction of Pressure Vessels Division 1 BPVC-VIII-1 - 2019. Publisher: ASME. Publish Date: 0. This Division of Section VIII provides requirements applicable to the design, fabrication, inspection, testing, and certification of pressure vessels operating at either internal or external pressures.
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BPVC-VIII-1-2019, Division 1 of Section VIII provides requirements applicable to the design, fabrication, inspection, testing, and certification of pressure vessels operating at either internal or external pressures exceeding 15 psig. Such pressure vessels may be fired or unfired. Specific requirements apply to several classes of material used in pressure vessel construction, and also to fabrication methods such as welding, forging and brazing. It contains mandatory and nonmandatory appendices detailing supplementary design criteria, nondestructive examination and inspection acceptance standards. Rules pertaining to the use of the U, UM and UV Code symbol stamps are also included.
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