Min distance between Shell weld seam and Nozzle

wijeesh · **Posted:** Fri Aug 12, 2011 9:05 am

Hello

Can anybody suggest the minimum required distance between longitudinal/circum weld seam and nozzle. Is there any requirement in ASME codes Div 1 or 2.
As per shell standards, it is 50mm or 2t whichever is greater. But confused with the value of 't' whether it is the thickness of shell or nozzle.

Regards
Vijeesh

Dr. Koelbl · **Posted:** Mon Aug 15, 2011 7:23 pm

DISTANCE?

Why make a distance, if you can use UW-14.
In the specs t is usually the thiskness of the vessel shell, legend of UW-16 may be used. But this would be considered an additional requirement over and above ASME Code.

DK

Javed Nasir · **Posted:** Tue Aug 16, 2011 12:16 pm

Hello Vijeesh,

No problem you can locate the opening in the weld seams as far as Division 1 is concerned as already cleared by DK.
Be careful about the following paragraphs if you locate the opening in the weld seams;
UG-37(a) see E1 in the nomenclature.
UW-52(b)(4)

I shall let you know after I check in Division 2.

Javed Nasir · **Posted:** Tue Aug 16, 2011 12:39 pm

Vijeesh,

I have checked Division 2 and additionally consulted with my senior, there is no prohibition in Division 2 against placing the opening(s) in welded seams.

wijeesh · **Posted:** Wed Aug 17, 2011 1:09 pm

Dear Mr DK & Nazir

Thank you very much for your reply.

Regards
Vijeesh

Min distance between Shell weld seam and Nozzle

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