Process Equipment and Plant Design
Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?

75% cut segmental baffle
25% cut segmental baffle
Disk and doughnut baffle
Orifice baffle

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

More in case of triangular pitch as compared to the square pitch tube layout
More than the tube diameter
Equal to the tube diameter
Not less than one-fourth of the tube diameter or 3/16"

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.

Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm²
Thickness of spherical shell is half that of the cylinderical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape ; hen
Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column
Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm²

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Process Equipment and Plant Design
A stuffing box is used for

Reducing the resistance of fluid flow
Prevention of fluid leakage around moving parts
Facilitating smooth opening and closing of a valve
Absorbing the contraction/expansion of pipeline due to temperature changes

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