High Pressured Gas Divertion

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az native Power-User Join Date: Nov 2008 Location: kibbutz nir-david, a beautiful rural village in Israel Posts: 307	High Pressured Gas Divertion 03/25/2013 8:13 AM
	To divert direction flow of high pressured gas, will it be enough to let the gas flow into a tank, that is constructed from a pipe which its diameter will be about 3 times bigger than the pipes diameter. If an outlet pipe will be placed in sharp angle on the tank, will it be sufficient to divert the gas without many pressure losses?
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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: high pressured gas divertion 03/25/2013 8:17 AM
	If there is flow, then there is frictional between the fluid and whatever structure it is flowing through or past, which in the case of enclosed flow manifests as a reduction in pressure. The geometry only determines how much. If only a change of direction is required, then a swept bend is probably the best one might do. There are tables of equivalent lengths of straight pipe for all manner of fittings in Perry, "The Chemical Engineer's Handbook", any edition, and "Kempe's Engineer's Yearbook", any edition. __________________ "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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passingtongreen Guru Join Date: Aug 2009 Location: Glen Mills, PA. Posts: 2385 Good Answers: 114	#2 Re: high pressured gas divertion 03/25/2013 9:15 AM
	This is not my area of expertise but I have picked up a deal of knowledge working under guidance of experts while designing large flue gas ducts. I'm fairly sure that you will have greater losses than if you used a pipe bend. The gas has to slow down into the greater cross section then speed up as it enters the discharge after eddying all around the tank. when it slows, pressure goes up, then when it speeds up, pressure goes down. The turn is abrupt in your scheme, gradual in a pipe bend. Clearly, the elbow is preferred. __________________ In a time of universal deceit, telling the truth is a revolutionary act. George Orwell
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pritam Guru Join Date: Aug 2008 Location: City of destiny, INDIA Posts: 775 Good Answers: 67	#3 In reply to #2 Re: high pressured gas divertion 03/25/2013 11:54 PM
	GA. Fully agreed. If only the pressure drop is an issue, then discharging to a higher dia tank and sharp outlet from the tank is a bad idea. It will attract additional pressure drop for sudden expantion and then sudden contraction (both are in proportional to squre of gas velocity) which will be much higher compared to a simple bend of radious 1.5 pipe dia. Use of large radious bend like 5.0 pipe dia will further reduce pressure drop.
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