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Process Equipment and Plant Design

Process Equipment and Plant Design
Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

√d
D
√(2d)
√(2πd)

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Process Equipment and Plant Design
At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure

May increase or decrease depending upon the solubility of the gas in the liquid
Remains same
Increases
Decreases

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Process Equipment and Plant Design
In perforated plate towers, the

Pressure drop is less compared is similar bubble cap towers
All of these
Total hole area may be around 6 to 15% of tower cross-sectional area
Hole sizes may be around 1/8" or 3/16"

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Process Equipment and Plant Design
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by

4(0.86p² - πd²/4)/πd
(4p² - πd²/4)/πd
4(0.86p² - πd²)/πd
(p² - πd²/4)/πd

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Process Equipment and Plant Design
In case of a shell and tube heat exchanger, the effect of L/D on inside film heat transfer co-efficient (hi) vanishes after a Reynold number of

10000
1000
3000
5000

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Process Equipment and Plant Design
A claming section before the liquid flows into the downcomer is privided to

Permit release of entrained vapour in the liquid
Reduce the discharge fluctuation
Cool the liquid before it flows down
Ensure better vapour-liquid contact

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