Pump Flow

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bhalchandra Commentator Join Date: Aug 2010 Location: pune Posts: 69	Pump Flow 07/07/2011 1:04 AM
	what is the difference between normal flow, rated flow & maximum flow for cenrifugal pump?. Which flow vendor specifies? __________________ Be not afraid of growing slowly, Be afraid only of standing still.
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Tornado Guru Join Date: May 2009 Location: Richland, WA, USA Posts: 21017 Good Answers: 795	#1 Re: pump flow 07/07/2011 1:35 AM
	I doubt that any of these terms has a broadly accepted definition. A centrifugal pump curve typically includes a wide range of flows versus heads (differential pressures). Maybe the far right end of the curve could be designated as "maximum flow," but more realistically, it would be "maximum flow at what NPSH_A conditions," like a sliding scale. The pump nameplate may specify a flow and head, both of which can vary along the curve. A designer would specify the flow and head required; a pump vendor would specify what a given pump can produce. __________________ In vino veritas; in cervisia carmen; in aqua E. coli.
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Jagdip Sheth Participant Join Date: Jul 2011 Posts: 1	#2 In reply to #1 Re: pump flow 07/08/2011 1:46 PM
	As far as vendor is concern ,he will give the duty point that is our design head and capacity The specified duty point is defined to be that point on the system H-Q curve for which a pump is to be selected in line with the calculated hydraulic design criteria. The objective of the selection is (apart from other criteria, such as maximum efficiency) to minimise the deviation between the specified and the actual duty points. Maximum head is the shut off head and maximum flow is the open discharge flow. NPSH_{A should be at least 3 meter above the}NPSHR for getting the trouble free pumping. Rated flow usually takes the maximum flow.If the maximum flow rate is not available then the rated flow can take 1.1 to 1.15 of the normal flow.
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pritam Guru Join Date: Aug 2008 Location: City of destiny, INDIA Posts: 775 Good Answers: 67	#3 Re: Pump Flow 07/13/2011 5:47 AM
	All these terms have meaning along with suction and discharge head. Suction head is generally considered same. Rated flow is at rated discharge head which is specified by the user and vendor offers. Normal flow and normal discharge head are the points where user operates pump most of the time. Maximum flow is the flow rate in H-Q diagram at minimum possible discharge head at user's system.
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Jagdip Sheth (1); pritam (1); Tornado (1)

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