Section VIII UG-84(h)(3)
Section VIII UG-84(h)(3)
(OP)
For materials requiring impact testing, there seem to be two interpretations, which one is correct? I hadn't heard of one of these interpretations until yesterday but I won't say which one as to not skew the question.
1. Since the paragraph says "When proceedure tests are made on material over 1 1/2 in. (38mm) in thickness", it is taken to mean that when a procedure is qualified on 1 1/2 in. thick material, only two sets of CVNs are required, but as per Section IX, the weld procedure is qualified to 8 in. thick max. (i.e. The 1 1/2 in. limit is only listed to define the amount of testing required for the procedure test and does not have to do with production limits.)
2. The 1 1/2 in. limit is taken as a production welding limits. So a procedure tested on 1 1/2 in. plate is only good to weld up to 1 1/2 in. material.
Or another interpretation???
1. Since the paragraph says "When proceedure tests are made on material over 1 1/2 in. (38mm) in thickness", it is taken to mean that when a procedure is qualified on 1 1/2 in. thick material, only two sets of CVNs are required, but as per Section IX, the weld procedure is qualified to 8 in. thick max. (i.e. The 1 1/2 in. limit is only listed to define the amount of testing required for the procedure test and does not have to do with production limits.)
2. The 1 1/2 in. limit is taken as a production welding limits. So a procedure tested on 1 1/2 in. plate is only good to weld up to 1 1/2 in. material.
Or another interpretation???





RE: Section VIII UG-84(h)(3)
You probably want to make the procedure tests on a 1 1/2 in. coupon for a vessel with higher thickness, and don't want to make the supplementary impact test per (h)(3): I think this would be correct.
prex
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RE: Section VIII UG-84(h)(3)
to Sec. VIII, Div.1 that is, PQR with 2 CVNs qualify for
welding only upto 1 1/2".
b) PQR as per interpretation no. 1 will not qualify for a
production welding to Sec. VIII, Div.1 on thickness more than
1 1/2", unless the 3 CVN's as per (h)(3) are carried out.
c) Hence, if you want to qualify a production weld as per the
following:
1) Conformance to Sect. VIII, Div.1
2) Thickness more than 1 1/2"
3) Using combination processes
Then, 3 CVNs are required for the PQR to qualify the above welds
and the qualification range would be 3/16" to 8".
General:
As deanc always outlines and I agree it would be prudent to contact your local AI. The above is merely my recommendation.
Cheers
RE: Section VIII UG-84(h)(3)
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!
RE: Section VIII UG-84(h)(3)
Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!