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Process Equipment and Plant Design

Process Equipment and Plant Design
Lug support is meant for supporting __________ vessels.

Large horizontal cylindrical
Small
Thick walled tall
Tall but empty

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Process Equipment and Plant Design
Maximum acceptable total liquid gradient over a tray is about __________ mm.

30.5
5.5
45.5
12.5

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Process Equipment and Plant Design
In the agitators, the power required will be changed with the increase of diameter of agitator (D) as

D⁵
D²
D⁹
D

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Process Equipment and Plant Design
Generally, as the length of the liquid path on a tray is increased beyond 5 ft, the overall column efficiency

Increases
Remains same
Decreases
May increase or decrease depending upon the plate spacing

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Process Equipment and Plant Design
In perforated plate towers, the

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

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Process Equipment and Plant Design
A cylinderical pressure vessel of volume 6 πm³ has to be designed to withstand a maximum internal pressure of 10 atm. The allowable design stress of the material is 125N/mm² and corrosion allowance is 2 mm. The thickness of the vessel for a length/diameter ratio of 3 will be close to

6 mm
5 mm
10 mm
8 mm

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