Difference between Spot and Partial RT weld inspection
Difference between Spot and Partial RT weld inspection
(OP)
I'm doing a calculation for a pressure vessel that was built back in 1980. I can't confirm the original MAWP and I think it has to do with the joint efficiency. For the Girth weld inspection, the U-1A form lists a Partial weld inspection. One of my collegues thought that partial inspections were removed from the code around 1985. What is the definition of a Partial weld inspection? Is it greater than or equal to a spot inspection? TIA





RE: Difference between Spot and Partial RT weld inspection
normally, the T-joints in Circumferential seams were spot radiographed and graded to full RT quality.
This yielded a 1.00 (100%) JE
look in UW-11(a)(5)(b)
these spots were over and above and of the 1 shot in 50 ft for any other spot RT.
RE: Difference between Spot and Partial RT weld inspection
RE: Difference between Spot and Partial RT weld inspection
RE: Difference between Spot and Partial RT weld inspection
RE: Difference between Spot and Partial RT weld inspection
but anyway, that's what the partial was. Worded a little differently as I remember, in essentially the same as now.
did it check out ok with 1.0 je?
RE: Difference between Spot and Partial RT weld inspection
RE: Difference between Spot and Partial RT weld inspection
After reading what the 1977 VIII-1 states about partial radiography, I agree with vesselfab.
Here is how a portion of the 1977 VIII-1 UW-11(a) (5) (b) reads:
……………partially radiographed. This shall consist of a radiographic examination at least 6 in. (152mm) long of any section of the weld picked at random, plus a similar examination of any intersections of the weld with all Category A welds in either of the sections being connected. Acceptance standards for partially examined welds shall be as set forth in UW-51 for full radiography……………
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RE: Difference between Spot and Partial RT weld inspection
RE: Difference between Spot and Partial RT weld inspection
Category B or C butt welds [but not including those in nozzles or communicating chambers except as required in (2) above] which intersect the Category A butt welds in vessel sections or heads or connect seamless vessel sections or heads shall be............. partially radiographed.
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