Hi Everybody, I'm a process engineer with 6 experience year. I'm trying the FLARENET software for a design of a flare header, but I have a problem with the this software. I have some PSV's that have a two-phase flow at the inlet, due to they protect some full-filled liquid equipment, so, in the case of fire, we are considering a initial two phase flow relieving. The issue is that I can not find how to simulate the PSV for this contingence in the flarenet, because I could not find the way to indicate the Vapor Fraction at the inlet or something equivalent. The flarenet only indicates a subcooling temperature (so, all the stream is liquid) or a superheater temperature (so, all the stream is gas). So, there is a way to do that, which I have not seen? THANKS A LOT!! I'm waiting for your comments!!!

carrerohm,

This is one of the MAJOR feature that FLARENET is lacking of.

I have met this issue before. One of handling it is use Balance unit in HYSIS and artificially change the condition to SINGLE phase (by jack-up the pressure and temperature).

Once you have got the proper artificial condition, your can remodel it in FLARENET with

single phase inlet (artificial) --> control valve --> two phase inlet to PSV (your feed condition) --> PSV --> PSV tail pipe.

I am sorry for above simple note. Hope you understand.


JoeWong

JowWong

Thanks a lot for your answer, but there is a thing that I dont understand: Your propose (or at least what I understand) implies to conect in series a control valve and a PSV, defining a single phase inlet (artificial) at the inlet of the control valve, that will discharge my feed condition to the PSV.

The problem is that I think that in Flarenet the PSV and control valves nodes only have a outlet, not an inlet, so I cant connect it in series... (or maybe I dont know how)

Regards..

carrerohm...

carrerohm

Sorry. Work too much on HYSIS

single phase inlet (artificial) --> PSV --> PSV tail pipe.

JoeWong