Flow rate in a gravity fed water pipeline

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SUMMARY

The discussion centers on calculating the maximum flow rate in a gravity-fed water pipeline from a reservoir to an outlet 40 meters lower. The user correctly identifies the elevation head as the driving force for flow and references a pipe friction handbook to assess head loss per 100 meters. Concerns about the longitudinal profile affecting flow rate and the necessity for the hydraulic grade line to remain above the pipe elevation are also addressed. Additionally, the user inquires about the PN rating of pipes, specifically PN8, and its relationship with temperature variations.

PREREQUISITES
  • Understanding of elevation head and its role in fluid dynamics
  • Familiarity with pipe friction loss calculations
  • Knowledge of hydraulic grade lines and their significance
  • Basic concepts of pipe pressure ratings, specifically PN ratings
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  • Research "pipe friction loss calculations using the Darcy-Weisbach equation"
  • Study "hydraulic grade line analysis in fluid systems"
  • Explore "effects of temperature on pipe pressure ratings and material selection"
  • Investigate "design considerations for gravity-fed water pipelines"
USEFUL FOR

Civil engineers, hydraulic engineers, and anyone involved in the design and analysis of water distribution systems will benefit from this discussion.

gilesm89
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Hi everyone,

First post here. Was hoping for some help from a pipeline guru.

I am looking into the maximum flow for a pipeline from a reservoir to an outlet about 40m lower.

The way I have been looking at it is what is elevation head of the reservoir surface and that is effectively the driving head for the flow. I am then looking at a pipe friction handbook and taking note of the head loss m/100m and then matching the total headloss to the elevation difference from reservoir surface to outlet. The book then gives me the flow rate in L/s for that value.

Am I on the right track? I did note that the longitudinal profile is a bit up and down (but never higher than the reservoir. Will this affect the flow rate? Must the hydraulic grade line be above the pipe elevation at all times?

Also the PN rating of pipe. As far as I understand PN8 could accommodate 80m of pressure. Does this vary with temperature?

Hope this makes sense!
 
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