Question: A sieve tray needs to be designed for the new pilot plant. The tray must be capable of operating effectively at a turn-down ratio of

A sieve tray needs to be designed for the new pilot plant. The tray must be capable of operating effectively at a turn-down ratio of 70%.

Given the following information:

Stream properties:

Vapor rate 87500kg/h

Liquid rate 70000kg/h

Vapor density 4.75kg/m3

Liquid density 852kg/m3

Surface tension 0.025N/m

Dimensions:

Down comer area (m2) 12% of the total area

Hole area 10% of active area

Hole diameter 5mm

Weir height 50mm

Tray spacing 0.6m

Tray thickness 5mm

Liquid flow arrangement - cross flow (single pass)

1. Estimate the diameter of the tray for 85% flooding

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