5% vs 10% radiography of butt welds in normal service
5% vs 10% radiography of butt welds in normal service
(OP)
ASME B31.3 calls for 5% of all butt welds in a lot to be radiographed for 100% of their lengths. However, common industry practice - for decades - appears to have been 10%. Does anyone know what started that and why?





RE: 5% vs 10% radiography of butt welds in normal service
RE: 5% vs 10% radiography of butt welds in normal service
RE: 5% vs 10% radiography of butt welds in normal service
And to fire that welder.
RE: 5% vs 10% radiography of butt welds in normal service
RE: 5% vs 10% radiography of butt welds in normal service
EPRI is currently investigating these types of issues for Pipe welds in the Power industry. In the late 1970's considerable work was done by the government as a result of the RT cheating on the Alaska Pipeline in this regard.
RE: 5% vs 10% radiography of butt welds in normal service
http://testimony.ost.dot.gov/test/pasttest/76test/...
RE: 5% vs 10% radiography of butt welds in normal service
RE: 5% vs 10% radiography of butt welds in normal service
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P.E. Metallurgy, Plymouth Tube
RE: 5% vs 10% radiography of butt welds in normal service
RE: 5% vs 10% radiography of butt welds in normal service
Piping Design Central
RE: 5% vs 10% radiography of butt welds in normal service
B31.8
826.3 The following minimum number of field butt welds shall be selected on a random basis by the operating company from each day’s construction for examination.
(1) 10% of welds in Location Class 1
(2) 15% of welds in Location Class 2
(3) 40% of welds in Location Class 3
(4) 75% of welds in Location Class 4
(5) 100% of the welds in compressor stations, and
at major or navigable river crossings, major highway
crossings, and railroad crossings, if practical, but in no
case less than 90%. All tie-in welds not subjected to a
pressure proof test shall be examined.
A826.2.1 (Offshore)
90-100%
B31.4
Generally 10%, except that all welds in the following locations (or a min of 90% of the welds, if some are inaccessible) shall be completely inspected;
(a) within populated areas such as residential
subdivisions, shopping centers, and designated commercial
and industrial areas
(b) river, lake, and stream crossings within the
area subject to frequent inundation; and river, lake, and
stream crossings on bridges
(c) railroad or public highway rights-of-way,
including tunnels, bridges, and overhead railroad and
road crossings
(d) offshore and inland coastal waters
(e) old girth welds in used pipe
(f) tie-in girth welds not
RE: 5% vs 10% radiography of butt welds in normal service
Have a look at the differences between acceptance criteria's for B31.8 ( API 1104) and B31.3 ? - I do not have access to B31.4.
Night and day difference on what is acceptable irrespective of % required,
Cheers,
DD
RE: 5% vs 10% radiography of butt welds in normal service