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Hi, I answer some questions: to use OLGA 2000 without the compositional model you need to supply a property table. I do it via PVTSim. In the case I'm facing the P&T range, as I said, is really large, so you could get results that are not so accurate. By the way, Latexman, Hysys 3.1 is from...

Hi all, of course I'm using a dynamic simulator (OLGA 2000 and Hysys, actually). Right now my problem is performing a correct simulation of the fluid entering the flare header, where very low temperature can be reached. The main problem with OLGA seems to come from the PVT table values (P & T...

Hi, I'm performing a blowdown calculation in adiabatic conditions for a gas header (mainly methane). Initial conditions are P=460 bara and T=60°C. The header has to be fully depressurized. The problem is that overcooling over -10 °C has to be avoided during depressuring (pipeline design...

You're right, but in real dynamic simulation I didn't specify ani "no-flow" option...I just have a valve and I see that I've mostly liquid coming out of it at first. Anyway, you've all been very helpful. Thanks a lot for your kindness, Best regards, Francesco

Hi WimVW, just like I wrote, I use the "no-flow" option for liquid since in reality we only have a BDV on top of the vessel. So the problem, once again, is: if I model this way using Hysys, given that it seems obvious that you get L+V coming out of the valve (it is even proved with a...

WinmVW, thanks for your answer. I used the utility you're talking about: problem is...are you confident with the results? If you are, how would you size the valve and the piping? By the way: did you choose the "no flow" option for the liquid valve parameter? Do the results are still...

Hello, thanks a lot for your help: I had the same problem, that is depressuring a dehydrator vessel containing 100% liquid from 8 barg to 4 barg in 15 mins (see API 521) in case of external fire. I'm using HySys 3.1 and experienced a lot of problems just beacause the depressuring utylity there...