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I have the internal area of the pipe(ft^2), flow rate(gpm at 7ft/min), Reynolds number, pressure drop(psi/100ft), and pressure drop(ft/100ft) shown on the flow table as attached. May I know what formulas can be used to connect these variables to see their relations? Note: because the large Re,it should be turbulent flow.

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The Darcy–Weisbach equation with the turbulent friction factor, supplemented by the Moody diagram or Colebrook equation.

Darcy–Weisbach equation

You can try it with this online calculator

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