Asieve tray is to be designed for the following application: vapour rate 32 000 kg/h liquid rate 30 000 kg/h vapour density 1.95 kg/m3 liquid density 955 kg/m3 surface tension 0.025 n/m the design requires a vapour velocity which is 75-80% of the flooding value and a turn-down ratio of 70% an existing single-pass sieve tray is available. the dimensions of the tray are given below: column diameter (m) 2.0 downcomer area (m2) 12 % of total area hole area 10% of active area hole diameter (mm) 5 weir height (mm) 50 weir length (m) 1.54 tray spacing (m) 0.5 tray thickness (mm) 5 rate the configuration by determining  whether the specified liquid arrangement is suitable.  the flooding velocity and the actual velocity based on the net area.  whether entrainment and weeping will be an issue.  the tray pressure drop is acceptable or not.  whether the tray spacing is acceptable by calculating the downcomer back-up.  whether the residence time is acceptable.