centrifugal pumps on their performance

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Anonymous Poster	centrifugal pumps on their performance 03/29/2009 9:42 PM
	http://images1f.snapfish.com/232323232%7Ffp934%3Enu%3D333%3A%3E23%3A%3E2%3B7%3EWSNRCG%3D323%3A76%3C89%3B698nu0mrj check on the link above , basic : i am being told , that two centrifugal pumps , diameter given , speed given , are pumping water , through two parallel pipes , to a tank , they want to know the difference of pipe flow and power between using 1 pump and 2 pumps . performance data are given for the pumps , these are data to plot a H-Q and efficiency graph . what i did on the spreadsheet , is plotting the graph , get the parabolic curve equation , workout the A B C representing the properties of the pump , work out the x value , square it , then the number = pipe flow .
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Anonymous Poster	#1 Re: centrifugal pumps on their performance 03/29/2009 10:14 PM
	At any given head add the flows and plot the curve for parallel operation. Superimpose the system curve for one and two pumps running.
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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 In reply to #1 Re: centrifugal pumps on their performance 03/30/2009 4:43 AM
	...and where the pump curve and the system curve intersect will be the operating point. __________________ "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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Hendrik Guru Join Date: Jan 2007 Location: Centurion, South Africa Posts: 3921 Good Answers: 97	#2 Re: centrifugal pumps on their performance 03/30/2009 1:42 AM
	You seem to be halfway there but ""work out the x value , square it , then the number = pipe flow ."" may be wrong. Your first step is to determine the pump curve for the specific speed and impeller diameter for your pumps. (In this step you must use the square) Remembering that for two pumps Q1 + Q2 = Qt (Qt = Q1 x 2) and P1 = P2 = Qt You need to add the flows together for each head point on the curve for a resulting combined curve. Try it and come back. It is assumed that the pipes are interconnected. __________________ Never do today what you can put of until tomorrow - Student motto
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Anonymous Poster (1); Hendrik (1); PWSlack (1)

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