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Compress and UG-45 on old vessels 1

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txcadman

txcadman

Mechanical
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Tom,

I came across your post "nozzle neck thickness output" regarding the UG-45 code requirements (see link below). I have a similar issue as plantguyjj, as I am evaluating a vessel fabricated in 1971 and the UG-45 requirements in the rating mode cause deficiencies in the nozzles. This vessel was fabricated before the UG-45 requirements and creates this discrepancy. I know that I can analyze the nozzles as "access openings" to exclude the UG-45 requirements, as you indicated in above mentioned post. My question is, is this a feasible solution? Is there anything in the code to support this? I agree that UG-45 should not apply to this older vessel, but I have not been able to find any backup information to support this.

Link

Thanks,
 
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When evaluating a design you do it to the original code of construction, if there wasn't UG-45 considerations in that year/add of the code, then you don't need to do it. Any new work 'should' be done to the latest code.

INTERPRETATION 95-19

Subject: Original Code of Construction/Edition/Addenda

Edition: 1995

Question: When the NBIC references “the original code of construction,” is it required to use the edition and addenda of that code as used for construction?

Reply: No. The term “original code of construction” refers to the document itself, not the edition/addenda of the document. Repairs and alterations may be performed to the edition/addenda used for the original construction or a later edition/addenda most applicable to the work.
 
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