Gas blowby 2 feeds

[michael99]

Hi All
I have an oil and gas platform. I have an LP separator with two feed sources. One source comes from an HP separator with pressure 85 barg which conveys an oil stream to LP separator. The other feed source at approx 16 barg has low pressure well fluids. I am looking at the gas blowby case from the LP separator to the HP separator. Ok sizing was no problem. But what about the liquid from the Lp system feed. Do i have to take this into consideration when sizing the relief valve. Note my Lp separator operates at 16 barg.
Thanks in advance michael

 

[shahyar]

I believe you are talking about gas blow by from HP to LP (not the other way around). However, for liquid portion, you need to check if you have enough room in your LP separator when all liquid in HP separator and the connecting pipe is "swept" by vapour at the beginning of gas blow by case.

if there is enough room, no need to consider it as a valid pressurizing case, otherwise it is a valid case (Even though it is not usually the governing case in my limited experience).
Hope this help.