Section VIII UG-84(h)(3)

[GRoberts]

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???

 

[prex]

Definitely vote for interpretation number one: that paragraph clearly refers to the thickness of the specimen used in procedure tests, the rules on the qualified thickness remain per ASME IX.
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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[PVRV]

a) interpretation no. 2 is the correct one for production welding
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

 

[sayee1]

Interpretation 1 is correct. The intent of the code here(my interpretation of it) is that if a PQR is qualified on a 38 mm or more thickness test coupen, three sets of impact required one for the HAZ and one WCL near the root(specified as near the surface of material-could be cap too????) and one at 50% the thickness WCL. UG-84(h) the deading is "Impact tests of Weld Procedure Qualifications" and as a subset of this UG-84(h)(3) is describing tests for Weld Procedure Qualifications Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!

 

[sayee1]

Sorry, correction, as your post pointed out GRoberts, "that if a PQR is qualified on a 38 mm or more thickness test coupen," to be replaced with "that if a PQR is qualified on more than 38 mm thickness test coupen," So if it is a 38 mm coupen as per section IX and UG 84h(3) with two cvn's should suffice for qualifying thickness range upto 8" Thanks and regards
Sayee Prasad R
Ph: 0097143968906
Mob: 00971507682668
End of all knowledge is the attainment of immortality!