Creating multi-chambered bottles with PULS

I have a sytem with 5 recip compressors.  The first stage of each compressor uses 2 of the cylinders, so I need to create a double hung bottle.  One of the performance runs indicates that the machines will be run in a single acting condition; and therefore, I am going to need a two chambered bottle with a choke tube in between the chambers separating the cylinders.  Since you cannot have a node connect to 4 points in PULS, how do you model this type of bottle?

The approach I used was to add a tee with minimal distance between nodes so I could add in the no flow region using an equivalent diameter (the ID of the bottle less the OD of the choke tube).  But, I am not sure if this is an accurate portrayal of reality.  I looked at the models that come with PULS in the Bentley file, but I wasn't able to determine how they were creating a mutli-chambered design. 

I also need to have a side stream.  That is, I have an interstage system where coming into the suction bottle there is the discharge from the previous stage and another process stream.  It would be analogous to a Y in a river.  Two different gas compositions coming together at a tee to form a new, third gas composition.  As of yet, I can only change the pressures, temperatures, and flows of individual pipes, but the gas composition is constant throughout the entire model. Is there a way to have multiple gas compostions in the same model?

Any help or modelling advice is appreciated. 

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