Dished Head Thickness Computations

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joozmax6 Active Contributor Join Date: May 2008 Posts: 13	Dished Head Thickness Computations 04/29/2009 3:38 AM
	Hi guys. I have a problem with a tank that we fabricated. we used a 6mm blank for the dished heads. The maximum depth of the dish w/o the straight flange is only 8", the diameter of the dish is 72". I can't find a formula to compute or estimate the thickness of the crown after forming. Can someone help me on this one? Another thing, I would like to know if there are other formulas that I can use to determine the maximum allowable pressure for the head that I have fabricated other than what is provided by ASME. Thanks in advance!
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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: Dished Head Thickness Computations 04/29/2009 3:43 AM
	Is it a tank with an open top, or is it a pressure vessel? The two paragraphs conflict. __________________ "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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joozmax6 Active Contributor Join Date: May 2008 Posts: 13	#2 In reply to #1 Re: Dished Head Thickness Computations 04/29/2009 3:57 AM
	Its a pressure vessel. the estimated operating pressure is 60 PSI. Its actually a filter tank.
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Anonymous Poster	#3 In reply to #2 Re: Dished Head Thickness Computations 04/29/2009 10:07 AM
	With that shallow of a head - you are not going to get much thinning at all. I don't have access to my literature right now, but will try to dig it up later on. Have you looked into Appendix 1-4 of ASME VIII Div.1? It provides alternate rules for various diameter/depth combinations for torispherical heads.
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