Correct Piping Size for N2 Injection

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kgomez Participant Join Date: Jul 2012 Posts: 3	Correct Piping Size for N2 Injection 07/30/2012 5:31 AM
	Hi , I need find out what is the minimum pipe size I will be able to inject 30000m3/hr hot Nitrogen at about 170 degree celcius for a reactor cooldown. Possibly looking at 30 hour operations here. Client had advised a 6" pipework but I believe that is too small and might cause me excessive back pressure at my N2 pumps. Is there any calculation I can show to client on what the minimum requirement will be.
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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: Correct Piping size for N2 injection 07/30/2012 5:40 AM
	A 1mØ pipe gives around 10ms^-1 velocity. At 6inØ and 170degC the velocity is around Mach 1! __________________ "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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pritam Guru Join Date: Aug 2008 Location: City of destiny, INDIA Posts: 775 Good Answers: 67	#2 Re: Correct Piping Size for N2 Injection 07/30/2012 11:58 AM
	Is it gas or liquid nitrogen? If it is liquid then 30000 m3/hr is too high a figure, and 170 degC is not possible. If it is gas then you must consider pressure. Also, normally flow of gases are expressed in at NTP (Nm3/hr). Please check whether you are talking about Nm3/hr or m3/hr. If it is Nm3/hr, then first convert in to m3/hr which will be a smaller figure. With m3/hr calculate velocity for 6" pipe, if it is above 15 m/s, go for higher size. But if you need only for 30 hours you may go for 50 m/s too.
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