Question

The allowable vapor pressure velocity, is taken to be

(a) 60 to 80%

(b) 50 to 60%

(c) 10 to 20%

(d) 30 to 40%

I had been asked this question during an interview.

Asked question is from Definition of Tray Area, Vapour Load and Liquid Load topic in section Tray Design and Operation of Distillation Design

Answer 1

Correct choice is (a) 60 to 80%

Best explanation: Clearly 60 to 80 % of the flooding velocity is calculated to keep the tray out of the danger of flooding.