The flow-head and peformance graph for cetrifugal pumps

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Discussion Overview

The discussion revolves around the performance characteristics of centrifugal pumps, specifically focusing on the flow and power differences when using one versus two pumps in a system with parallel pipes. Participants explore the implications of various parameters such as pump diameter, speed, and pipe characteristics on the overall system performance.

Discussion Character

  • Technical explanation
  • Homework-related
  • Mathematical reasoning

Main Points Raised

  • One participant presents a spreadsheet with calculations and graphs related to pump performance, including the derivation of a parabolic curve equation for the pump's characteristics.
  • Another participant questions whether the only differences between the two systems are the pumps themselves and seeks clarification on what information can be used to determine the differences in performance.
  • A participant identifies the Darcy friction factor as a critical parameter, noting that it can be obtained from a chart or through calculations.
  • Another participant references the Moody Diagram and the Colebrook equation as tools for determining the friction factor in pipes.
  • A later reply clarifies that the homework question specifically asks for the difference in pipe flow between using one pump and two pumps.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are questions regarding the relevance of various parameters and how they affect the system performance. Multiple viewpoints on the necessary information and calculations remain present.

Contextual Notes

Participants express uncertainty regarding the integration of various parameters such as diameter, length, and friction factor into their calculations. There is also a lack of clarity on how to apply the performance data provided for the pumps.

waterskin7
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http://images1f.snapfish.com/232323232%7Ffp934%3Enu%3D333%3A%3E23%3A%3E2%3B7%3EWSNRCG%3D323%3A76%3C89%3B698nu0mrj

check on the link above , it is my workings on spreadsheet and data given .
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 and darcy f 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 .

so where do those other informations comes in ? i mean the dia , length , darcy f .
 
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It seems that the only differences between the two systems are the pumps themselves? Is that correct? If so, then what information can be used to determine the differences? What adjustments will need to be made?
 
Darcy is the pipe friction factor. You get this value from reading a chart or performing a calculation.
 
my apology , what i think my homework was asking is , the difference of pipe flow between using one pump and using two .
 

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