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Process Equipment and Plant Design

Process Equipment and Plant Design
The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is

pd/2t
pd/4t
pd/8t
pd/t

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Process Equipment and Plant Design
Bubble cap diameter used for the distillation column having diameter ranging from 1.5 to 4.5 metres is about __________ mm.

10
100
50
150

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Process Equipment and Plant Design
Cooling water fouling factors vary in the range of 0.001 to 0.003

(kcal/hr.m² .°C)⁻¹
(kcal/hr. m. °C)⁻¹
(W/m².°K)⁻¹
(BTU/hr.ft² . °F)⁻¹

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Process Equipment and Plant Design
The operating velocity in the absorption tower is usually 40-50% of the flooding velocity. Packed absorption towers are normally designed for a pressure drop of about __________ mm of water column per metre height of packing.

43835
100-150
1000-1500
20-40

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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

20.8
1
∞
2

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Process Equipment and Plant Design
The main purpose of providing stepping on the trays is to

Improve the flow condition
Facilitate handling of large flow rate of liquid
Decrease the pressure drop
Increase the residence time

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