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Blowdown Using Hysys


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#1 274@P6


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Posted 26 April 2021 - 10:43 PM

Hi all,


What is the prime difference between blowdown analysis and depressuring utilities in hysys? 


For orifice size fire which one is i have to use? i calculated cv using depressuring utility fire case and find Minimum temp using adiabatic. i donno where and how to check? 

#2 breizh


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Posted 27 April 2021 - 01:17 AM


Let you try your favorite search engine ,key words Blowdown Hysys you will be amazed  with the answers ( tech doc, videos,...)

Good luck


#3 ChEf


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Posted 28 April 2021 - 10:45 AM

The blowdown is the Imperial College software made available to aspen hysys users. Long story short, it has an enhanced thermodynamic and is based on rigorous approach wrt depressuring legacy utility. The legacy utility is based on a simplified approach. Some efficiencies and the pv work term may be changed to get more to less conservative results. On the way to do things, I would suggest you to follow the procedure of your company or of the project you are involved with. Read also API 520 and 521.

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