I want to know about Gas Blow-by case for PSV?

A 3phase inlet separator at production unit with 14.8 barg pressure has 101 barg design pressure. The Hydrocarbon phase of this vessel after pass of 2 exchanger is sent to another 3phase separator with 10 barg pressure (12 barg design pressure). If control valve of upstream separator is failed, how can i calculate the rate of gas for blow-by case?

if it is possible please send your answer to my email (ebrahimy54@yahoo.com).

You only need to view the post "Inadverent Control Valve Opening" that immediately follows your post.

ok. I know gas blow-by will be happen when up steam liquid phase control valve is fail and gas from liquid line entered to down-stream equipment.

But I want to know for mentioned conditions have been described, how I can calculate the rate of gas for gas blow-by condition.

Did you read the post I referenced? I tell you exactly how to do the calculation.

YOUR MENTIONED REFERENCE IS BOOK OR PAPER?
HOW CAN I ACCESS TO IT?

LOOK FORWARD TO HEAR FROM YOU.

mohammad,

I believe there are some mis-communication here...

Phil has directed you to read post entitled "Inadverent Control Valve Opening".


Hope this help.

Thanks very much Joewong for your kindly attentions.
i will check it.

Take your time to understand what Phil has pointed in the post. You will get the main idea.

If you still have problem or doubt, you may raise specific question with necessary inputs. Only specific question with necessary inputs would gain more and quick response.

Good luck.