The "mechanical restriction on tray" message printed out during the tray sizing results, means that the free path length calculated at the design diameter was less than sixteen inches. If the next larger diameter is used, the free path length would be sixteen inches exactly and this mechanical restriction would not exist.
If the information from the tray sizing section is to be used for equipment design, it is recommended that a tray vendor be contacted to see if the efficiency of the tray would suffer if the minimum free path length of sixteen inches is used on a tray.
About PRO/II: PRO/II is the major product in the Process Engineering Suite (PES). This process simulation software optimizes plant performance by improving process design, operational analysis, and performing engineering studies. It is designed to perform rigorous heat and material balance calculations for a wide range of chemical processes. PRO/II allows users to evaluate the use of heat integration with case studies, rigorously evaluate process improvements with the help of a process flow diagram (PFD), or model crude distillation units. PRO/II offers a wide variety of thermodynamic models to virtually every industry and is incredibly cost effective, decreasing both capital and operating costs.
Technical Support: As always, feel free to reach out to your local technical support team for more information.
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