simulation correlations??

[lzz]

i'm trying to run a simulation for a succion of a VRU, so the vapors conditions are, low presure, low flow rate,the line diameters are bigger than 8'', and the lenghts are superior to 5000ft,i'm using Begg & Brill–Moody for presure drop method, and thermodinamic system peng-Robinson. which are the correct correlations that i must use for this conditions?
I hope you can help me..

 

[C2it]

You might get a faster answer if you post this question in the Chemical Engineers / Process forum.

 

[BigInch]

Your vapor to liquid ratio, velocity and configuration parameters will set the flow regime, correlate pressure drop with the flow regime you have. I'd guess you're looking at either gas-mist flow, or if you have a heavier stream, then liquid flowing along the bottom, but you need to check that yourself. You're the one with the data.

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[KernOily]

You should be OK with those. We typically use SRK for this. BUT - SRK can have iffy behavior if you have a large water fraction so watch out. Best to run a few simulations and then compare your results with actual field measurements of dP. If you can't do that, then SRK or PR will give you acceptable results within 25%. You don't say what simulator you are using, but if you are using Pipephase, make sure you set it up to run multiphase compositional.