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Process Equipment and Plant Design

Process Equipment and Plant Design
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

> 20 < 50
> 7 < 15
< 30
< 7

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Process Equipment and Plant Design
The maximum liquid gradient over a tray must not exceed

Half the tray spacing
5"
2"-3.5"
0.5" -1.25"

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Process Equipment and Plant Design
A cylindrical storage tank can have a self supported conical roof,

If its diameter is more than 50 meters
If its diameter is less than 15-20metres
If the thickness of the roof is more than that of the cylindrical shell
Irrespective of its diameter

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Process Equipment and Plant Design
Steam is preferred to be used as a heating medium in heat exchangers, because of its

High latent heat
Non-corrosive condensate
Low cost
High film co-efficient

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to

2
∞
20.8
1

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Process Equipment and Plant Design
Which of the following factors affect the pressure drop in a co-current gas-liquid absorption packed tower?

Size, shape, orientation and surface of the packing particles
Density and viscosity of fluids
Fluid flow rates
All of these

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