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For the down comer backup, the quantity HW + HOW is called?

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For the down comer backup, the quantity HW + HOW is called?

(a) Kinematic liquid seal

(b) Dynamic liquid seal

(c) Static liquid seal

(d) Tray liquid seal

The question was posed to me in an internship interview.

Enquiry is from Tray Capacity Limits topic in section Tray Design and Operation of Distillation Design

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Correct answer is (c) Static liquid seal

Easy explanation: Where HW = is height of liquid over weir and HOW = sum of weir heights, down comer is also essential at a point of time.

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