Power Piping (Velocity?)

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JBK Associate Join Date: Jun 2011 Posts: 32	Power Piping (Velocity?) 07/13/2011 12:26 AM
	Hi, Please let me know that the required design velocity for the following pipe lines for Combined Cycle Power Plant? - HP Steam Line - MP Steam Line - LP Steam Line - Turbine Bypass Line - HP/LP Bypass Line - Boiler Feedwater Line (BFP Suction & Discharge) - Condensate Water Line
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Ace Boeringa Guru Join Date: Mar 2006 Location: Washington USA Posts: 566 Good Answers: 53	#1 Re: Power Piping (Velocity?) 07/13/2011 12:45 AM
	Greater than zero. Less than mach 1.
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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	#2 Re: Power Piping (Velocity?) 07/13/2011 3:57 AM
	Economic considerations of pressure drop versus pipe size would suggest that, as a rule of thumb, if a gas flow exceeds 10m/s then the piping is too small. For a liquid, the figure is around 3m/s. __________________ "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	#3 Re: Power Piping (Velocity?) 07/13/2011 4:48 AM
	I can suggest following: - HP Steam Line- (PN64) : 45 m/s - MP Steam Line- (PN25) : 35 m/s - LP Steam Line- (PN25) : 30 m/s - Boiler Feedwater Line - 3 m/s
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MJCronin Power-User Join Date: Oct 2009 Location: Central Midwest Posts: 455 Good Answers: 38	#4 Re: Power Piping (Velocity?) 07/13/2011 10:29 AM
	JBK.... Recommended velocities for the systems you mentioned are contained in the Piping Handbook, by Nayaar. Please be aware that, in real Engineering Companies (like, say Bechtel), a detailed study is done comparing Main Steam, HRH & CRH piping diameters vs. best steam velocities in order to get the best financial ROR over the plant life. These systems are so important and can affect the overall plant economics, that a detailed study is warrented. Is this the first time that you have ever sized piping systems ? -MJC __________________ We have met the enemy....and he is us. POGO
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Ace Boeringa (1); MJCronin (1); pritam (1); PWSlack (1)

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