Flow rate in a gravity fed water pipeline

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To determine the maximum flow rate in a gravity-fed pipeline from a reservoir 40m lower, the elevation head of the reservoir is crucial as it drives the flow. Calculating head loss using a pipe friction handbook and matching it to the elevation difference is an appropriate method to estimate flow rates. Variations in the longitudinal profile can impact flow rates, and the hydraulic grade line must remain above the pipe elevation to prevent issues. The PN rating, such as PN8, indicates the pressure capacity of the pipe, which can be affected by temperature changes. Understanding these factors is essential for effective pipeline design and operation.
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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