The Force on Tube

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yesyen Guru Join Date: Jul 2006 Location: India-Chennai. Posts: 722 Good Answers: 30	The Force on Tube 02/10/2015 9:08 PM
	The suggested pressure range of TEMA BET type is - 75 psi to 300 psi and AES is - 75 psi to 600 psi. But the suggested pressure range for BEP tube-side is 3000 psi and shell-side max 150 psi. I am perplexed with following questions: What makes BEP to take more pressure compared to BET and BEP? When a BEP exchanger operates with full pressure of 3000 psi, say on a triangular pitched ¾" tube pattern, what could be force (in pounds/kgs) acted on one rolled joint? __________________ A picture worth thousand words: needless to say if it is animated.
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SolarEagle Guru Join Date: Mar 2007 Location: by the beach in Florida Posts: 33392 Good Answers: 1817	#1 Re: The force on tube 02/10/2015 10:50 PM
	Found this.... http://deltathx.com/uploadsdocs/tematypes.pdf __________________ All living things seek to control their own destiny....this is the purpose of life
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Kulas Power-User Join Date: Dec 2014 Posts: 418 Good Answers: 3	#2 Re: The force on tube 02/10/2015 11:01 PM
	Pressure is Force over lateral area of the tube, just get internal lateral area and force should be direct forward the qoutient of Pressure and that area. __________________ "When I thought I exceeded to be wise but wisdom was far from me" -King Solomon
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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 Re: The Force on Tube 02/11/2015 10:31 AM
	A1: a combination of process conditions and corrosion allowance is one possibility. __________________ "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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yesyen Guru Join Date: Jul 2006 Location: India-Chennai. Posts: 722 Good Answers: 30	#4 In reply to #3 Re: The Force on Tube 02/11/2015 2:19 PM
	TEMA doesn't insist a particular 'process condition or corrosion allowance' specific to BET or AES or BEP. In fact BET and AES tube-sheets are better fastened than BEP. BEP floating head is free to get blown off when subjected to high pressure than designed. Still, why BEP is suggested to bear 3000 psi where as other two are limited to just 300/600 psi? For easy understanding of question 2, a mock-up sketch is shown with only one tube on to a floating head: (I'm unable to load the image, don't know why?) Still... If the prevailing pressure = P, Tube OD = D, ID = d. Now the question is: The force acted upon the tube joint is: P π/4 D²or P π/4 (D²-d²) ? __________________ A picture worth thousand words: needless to say if it is animated.
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MJCronin Power-User Join Date: Oct 2009 Location: Central Midwest Posts: 455 Good Answers: 38	#5 Re: The Force on Tube 02/12/2015 8:50 AM
	Yesyen, You have no background or understanding of modern heat exchanger design. You don't seem to understand that TEMA heat exchangers are CUSTOM DESIGNED TO THE CONDITION SPECIFIED BY THE PURCHASER in accordance with the strength rules of the ASME VIII (or similar) pressure vessel code. The design pressure of the specific HX has nothing to do with the purchaser selected TEMA type. The strength of the tube for a particular HX is based on the pressure vessel code rules used in the overall design. __________________ We have met the enemy....and he is us. POGO
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Kulas (1); MJCronin (1); PWSlack (1); SolarEagle (1); yesyen (1)

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