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Psv Outlet Line Sizing For Liquid Phase

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#1 Niku


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Posted 30 August 2018 - 11:46 AM

Dear all,


i am doing PSV calc, for gas reliving case  the highest discharge area i.e P. now i have to do line sizing for inlet and outlet based on this flowrate. 


PSV set pressure is 6.7 barg.

PSV relieves to LP flare.

i know that for oulet line total BP should be less than 10% of set pressure,


my question is: what is outlet Pressure which i should put in "Isothermal flow" in systool in order to find inlet pressure?


many thanks,

Edited by Niku, 30 August 2018 - 11:48 AM.

#2 SawsanAli311


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Posted 07 September 2018 - 02:58 PM



Can you please clarify your question again since the PSV inlet line sizing is done considering the 3 % non-recoverable inlet pressure losses based on PSV rated capacity. Outline line sizing is done by checking the PSV backpressure and mach number, you need to specify the Q-P curve of your flare tip in the simulator you are using. 

#3 garjegt


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Posted 08 September 2018 - 09:50 AM

Can anyone help me for calculating vent sizing of hydrogenator.
Please provide excel work sheet

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