Minimum Distance to Be Left Between Welded Joints in Pressure Vessels

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pilot joe Associate Join Date: Nov 2011 Posts: 31	Minimum Distance to Be Left Between Welded Joints in Pressure Vessels 11/19/2012 3:01 AM
	Hi guys , in one the pressure vessels under fabrication ( 2 meter dia ) , the blank sheet used by the fabricator ( 6000 mm ) Was not enough to be rolled one time and obtain the required circumference (2265 ) so he has to make two weld as shown in sketch , in ASME SEC VIII DIV.1 UW-9 APP.D it says that the distance between 2 longitudinal welds should be 5 times the plate thickness , but some fabricators confirmed that such a distance might cause problems during welding so they push the limit to 300 mm at least ( 500 mm in some oil and refinery companies here in GULF ) now the clear question , what is the ideal distance to be left ? kindly support your answer from the code if possible , has the code been amended regarding this matter ? regards
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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: minimum distance to be left between welded joints in pressure vessels 11/19/2012 3:47 AM
	Neither CR4 nor its readers can offer burst indemnity insurance cover for pressure vessels, so this question must be addressed to the Engineer/Surveyor from the company providing burst indemnity insurance cover for the facility. That individual will need to know the materials-of-construction of the vessel and all internals, the wetting fluid and a whole heap of other information that has been omitted from this post. Maybe the best way would be to arrange for that individual to attend the facility where all the information may be found and open discussions on the topic, perhaps? __________________ "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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pilot joe Associate Join Date: Nov 2011 Posts: 31	#2 In reply to #1 Re: minimum distance to be left between welded joints in pressure vessels 11/19/2012 3:56 AM
	Dear pw slack thanks for replying to the post , the material of the vessel is carbon steel A-36 , the design pressure and temp is 5.0 bar and 50 degrees respectively , connected pipe material in carbon steel to ASTM A53 sch.40 and all flanged are BS4504 PN 16 , vessel dia is 2000 mm as mentioned and the shell height is 1500 mm sorry for not mentioning these details in the first post regards
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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	#4 In reply to #2 Re: minimum distance to be left between welded joints in pressure vessels 11/19/2012 4:40 AM
	Please mention them to the Engineer/Surveyor for the company providing burst indemnity insurance for the facility when that individual calls in. __________________ "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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Joshi Guru Join Date: Oct 2007 Location: India Posts: 1246 Good Answers: 34	#3 Re: minimum distance to be left between welded joints in pressure vessels 11/19/2012 4:02 AM
	Do you have to submit the vessel for inspection? If the answer is yes, then IMHO the inspection authority's ruling shall prevail.
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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	#5 In reply to #3 Re: minimum distance to be left between welded joints in pressure vessels 11/19/2012 4:41 AM
	Quite. __________________ "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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Joshi (1); pilot joe (1); PWSlack (3)

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