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Flare header have pressure at 1 barg and set pressure at 41 barg for relief LPG from pipeline. Dischage line have 2" length 500 m. pls recommend me to calculate back pressure.

Thank you

[pleckner]

Start at the flare tip where you know the termination pressure and calculate backwards to the PSV outlet flange. Use the gas flow equations, adiabatic or isothermal, your choice. I usually use the Isothermal gas flow equation because it's simplier.