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.
Hello Kyle,
If you have not already done so, suggest to review the PULS WIKI page here for modeling multiple gas compositions over a range of piping and Designing multi-chambered bottles.
Regards,
Mike DattilioBentley Product Advantage Group AnalystAutoPIPE Product Line Bentley Systems, Inc.===================================================
Answer Verified By: Mike Dattilio