UG-116 Required Marking

pvesseleng · Dec 27, 2004

Hi Everybody,
If any vessel it has Category A, B, C welds as illustrated in Fig. UW-3.
With customer approval RT requirements as described in UW-11 satisfied by Automatic Ultrasonic Test (AUT) Method according to Code Case 2235-6.
But, some of the nozzle exceeding either NPS 10 or 1 1/8 (29 mm)wall thickness (which are require radiography for their full length) couldn't be made Automatic Ultrasonic Test because of in some weld seems its not applicable to make AUT. For that reason this nozzle welding has radiographically examined.
According to Code Case 2235-6 it has to be stamped ''UT''. But some of the weld seems RT examined.
and
in UG-116 (e)(4) states that nameplate should be marked ''RT 4''when only part of the vessel satisfied the radiographic requirements of UW11(a)or where none of the markings ''RT1'',''RT2'' or ''RT3'' are applicable

Q1)How ASME nameplate has to be marked(for NDT) only UT or UT-RT4
Q2)on U1-A Form how this situation has to be mentioned.

Regards

JoeTank · Dec 27, 2004

I don't have an ASME VIII available to me at this moment, but I thought the UT option was only used when a suitable RT could not be performed on a closure seam. If my memory is correct, seems that UT should not have been used in this case. Have I missed something here?

Steve Braune
Tank Industry Consultants

http://www.tankindustry.com

metengr · Dec 27, 2004

Please check with your Authorized Inspector regarding Code case 2235-6. They should be able to direct you with the nameplate information requirements.

pvesseleng · Dec 28, 2004

metengr,
of course we have discussed this issue with our AI. I just want to know opinions here(especially yours..)
my personal opinion is that,
the first necessity according to ASME satisfiying the requirements of UW-11, as an alternative for RT1 requirements we have used UT so ve have to only stamp as UT and on the MDR in remarks section which it has to be stated which nozzle welding radiographed.

metengr · Dec 29, 2004

I have reviewed code case 2235-6, and per the requirement in 4 (k), the nameplate shall be marked with UT, and the code case shall be included on the Manufacturers Data Report along with the extent of the UT examination.

I would mark the nameplate as RT 4 and UT, not RT4-UT under the code symbol stamp. You will need to be descriptive on the data report to describe the extent of the UT examination of the vessel welds, per category. I would also describe which vessel welds were subjected to RT on the data report.

Make sure your AI agrees with this approach.

pvesseleng · Dec 29, 2004

UG-116 (e)(4) states that nameplate should be marked ''RT 4''when only part of the vessel satisfied the radiographic requirements of UW11(a)or where none of the markings ''RT1'',''RT2'' or ''RT3'' are applicable

In this situation by using Code Case 2235-6, UW11(a) requirements alternatively have met and RT1 applicable(but as an altenative way to satisfying RT1 requirements UT used)
In UG-116 (c)some lettering required on the nameplate listed and separation of this lettering from the others by a hyphen. Actually I havent seen anywhere in the code multi-lettering how to be written. On the marking area below the ASME stamp ''and'' may cause misunderstanding.

GenB · Dec 30, 2004

If I was the AI I would let you stamp UT only, Why? RT is is stronger and it is no need to specify in the name plate,
It has to be speciffically stated in the Mfr's Data Rpt

Some Mfrs actually stamp the Code Case on the nameplate,
under the UT lettering!
GBlr

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