Blind Flange Thickness Calculation Value Mismatch

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ashok4344 Participant Join Date: Sep 2013 Posts: 2	Blind Flange Thickness Calculation Value Mismatch 09/20/2013 12:10 AM
	Hi every one... i calculated blind flange thickness as per asme section 8 using formula d(cp/se+1.9whg/sed3)1/2. but i am getting a higher value than asme 16.47 for 40" flange. what is the reason for this??
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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: 32161 Good Answers: 838	#1 Re: BLIND FLANGE THICKNESS CALCULATION VALUE MISMATCH 09/20/2013 3:24 AM
	Is the right equation in use? It is impossible to tell here, as the heiroglyphs are undefined. Has the pocket calculator got a low battery voltage? __________________ "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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MJCronin Power-User Join Date: Oct 2009 Location: Central Midwest Posts: 455 Good Answers: 38	#2 Re: Blind Flange Thickness Calculation Value Mismatch 09/20/2013 8:37 PM
	ashok, Calculation of flange sizes under ASME Section VIII is by a different methodology, developed by a different regulatory authority than ASME B16.5 ( flanges to 24")and B16.47 ( flanges above 24"). The more flexible ASME VIII rules will always require a more conservative (read thicker) design. They were never meant to be equal. __________________ We have met the enemy....and he is us. POGO
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ashok4344 Participant Join Date: Sep 2013 Posts: 2	#3 Re: Blind Flange Thickness Calculation Value Mismatch 09/23/2013 9:46 AM
	actually i am working in a project where i faced a different scenario. There is a 40" flange whose thickness is 90mm as per ASME B16.47. the design pressure is 17 bar and temperature 65 deg. celsius. Is it possible to reduce the thickness of flange by 5mm by in situ machining and after reducing thickness whether it can withstand the same design conditions?
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