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Process Equipment and Plant Design

Process Equipment and Plant Design
Safety valves are provided in chemical equipments to guard against excessive

Turbulence
Noise
Pressure/pressure fluctuation
Temperature

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Process Equipment and Plant Design
Normally, the plate thickness of the bottoms and roofs of vertically cylindrical storage vessels as compared to that of the cylindrical shell is

More
Less
Same
More or less depending upon the pressure & temperature inside the vessel and the nature of the fluid contained therein

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Process Equipment and Plant Design
To keep the power input constant for a stirred vessel operating under fully developed turbulent flow conditions (constant power number), if the impeller diameter is increased by 20%, the impeller speed should be decreased by a factor of

(1.2)3/5
(1.2)2/3
(1.2)3/2
(1.2)5/3

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Process Equipment and Plant Design
Baffles may be eliminated for

High viscosity liquids (> 600 poise)
Low viscosity liquids (< 200 poise)
Large diameter tanks
None of these

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Process Equipment and Plant Design
Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around

0.4-0.6
0.35-0.75
0.55-0.85
0.1-0.2

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Process Equipment and Plant Design
Le/D for fully open gate valves would be

Much less (say 2% than that for fully open globe valves)
Both B and C
Around 7
Much more than that for fully open globe valves

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