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Tank Depressurisation Through Vent Pipe Calculation

fanno flow depressurisation choked flow venting

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#1 lambonumber5


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Posted 08 April 2021 - 05:50 AM

Hi Guys, 

I have been trying to write a model to calculate the depressurisation of hydrogen out of a tank through a vent line. I've used the fanno flow calculations as the tanks are at about 350bar so the flow will be choked. The results are in the expected ballpark but no one in my company can validate the results. I'd really appreciate it if someone with more knowledge and experience in this field would check what I've done.

Much appreciated 


Attached File  Depresurization calculator.xlsm   498.65KB   71 downloads

#2 Ali Akhoundi

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Posted 04 September 2022 - 05:58 AM

Have you tried to examine it by Hysys blowdown tool?

#3 breizh


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Posted 04 September 2022 - 06:59 AM


You may want to take a look at these documents to support your query with this approximation. I don't have access to software.


your calculation should stop when the pressure reaches 1 bar 

Good luck


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