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Process Equipment and Plant Design

Process Equipment and Plant Design
The ratio of down take area to cross-sectional area of the tube, for calendria type evaporator ranges from

1.5 to 2
2 to 2.5
1 to 1.5
0.5 to 1

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Process Equipment and Plant Design
Heat transfer co-efficient, hG(Kcal/hr.m² .°C) and mass velocity of air, G (kg/hr.m² ) for air flow parallel to the surface in case of constant drying rate in batch drying is related as hG = 0.0176G0.8. But when the flow of air perpendicular to the surface is encountered, this equation changes to

HG = 0.0176G0.37
HG = 1.004G0.37
1.004G0.8
0.0176G1.37

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Process Equipment and Plant Design
The thermal stress in a metallic bar does not depend upon the

Cross-sectional area
Changes in temperature
Both A & B
Neither A nor B

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Process Equipment and Plant Design
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").

Three fourth
Equal to
1.5 times
Half

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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
Pressure drop is less compared is similar bubble cap towers
All of these
Hole sizes may be around 1/8" or 3/16"

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Process Equipment and Plant Design
Joint efficiency (J) for a seamless pipe is

1.2
1
< 0.5
0.85

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