Offshore Line Depressurize

hi guys


i have a problem about that

i have line with 82 km length from offshore @ 140 bar 40 C degree

recevied to onshore @ 81 bar 20 C degree

i have gas + condensates compositions and molar flow (1620 MMSCFD)

required:
1) Stop offshore production and calculate how long it will take to depressurize the line from 140 bar to 81 bar then from 81 bar to 1 atm , so i need the Equations to solve this problem

2) how can do that problem by HYSYS 3.1 from utility ( i know it should be 15 min but here in may case the time is required to calculate

any on can help me ?? as possible as fast plz

Regards

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