ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser

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nbhide108 Commentator Join Date: Apr 2009 Posts: 67	ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser 08/20/2013 2:32 PM
	Laser welded jacket as per Appendix 17 has jacket thickness 1.2 mm. Before inflating of jacket, 1.2 mm jacket plate will be flared to suit nozzle ID. Jacket will be inflated after laser welding. Nozzle of size DN 25 X SCH 40s will be welded to the 1.2 mm thick flared portion of jacket. Can I apply UW-13.4 (Nozzle Weld Attached To Piping Of Lesser Wall Thickness) ? I don't understand how to calculate trn. Jacketed panel will be under U-Stamp Certification. Jacket panel will be burst tested as per UG-101(m). At min. burst pressure 87.5 bar. Is such butt weld between nozzle and flared jacket portion of 1.2 mm passed under UW-13.4 ? Is their any other method? Please guide. Thanks NAB
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#1 Re: ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser 08/20/2013 4:51 PM
	The best person to ask is the Engineer/Surveyor for the company that will be providing burst indemnity insurance for the vessel. Surely that individual has been sent a copy of the latest edition "for construction" mechanical drawing for the vessel? __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#2 Re: ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser 08/21/2013 12:41 AM
	Why is the jacket to be rated at 87.5 bar? A better method might be to butt-weld the flare to a tube of about 1.2 mm wall thickness. There are several options for continuing the piping on site. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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PWSlack Guru Join Date: Jan 2007 Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on. Posts: 32175 Good Answers: 839	#3 In reply to #2 Re: ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser 08/21/2013 4:04 AM
	Good question. Take a Team Point. __________________ "Did you get my e-mail?" - "The biggest problem in communication is the illusion that it has taken place" - George Bernard Shaw, 1856
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nbhide108 Commentator Join Date: Apr 2009 Posts: 67	#5 In reply to #2 Re: ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser 08/21/2013 12:44 PM
	Design pressure is 17.5 bar. As per UG 101 (m), Burst pressure is min. 5 times design pressure.
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SHOCKHISCAN Guru Join Date: Nov 2007 Location: Eastern Arizona mountains on Route 666 about a mile from God's country Posts: 1676 Good Answers: 122	#4 Re: ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser 08/21/2013 8:54 AM
	I am in no way well versed in this but in many instances I have observed the use of a repad to strengthen the welded joint enough to meet code. The procedure is simple in that similar material is cut on an inside and outside radius so that it lays completely around the fitting and is then welded where the repad contacts the fitting and where it contacts the vessel/jacket. A search on "use of repad on welded fittings" should shed some light on the subject and define the size and thickness requirements of the repad. __________________ They said; "Brain size?" I heard; "Train size?" so I said: "I'll take a small one, thank you."
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asd23789 Commentator Join Date: Jun 2011 Posts: 63	#6 Re: ASME Section VIII Division 1 : UW-13.4 -Nozzle Weld Attached To Piping Of Lesser 08/26/2013 7:39 AM
	Dear Sir, Is the jacket portion requiring U stamp certification? I have worked with these jackets and the vendors provide welding details of such nozzles. Please check with the vendor once again. Regards ASD23789 __________________ The light of blindness of knowledge is yet to reach me, forget being clever.
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