Chemical Engineering :: Process Equipment and Plant Design
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Generally, no corrosion allowance in wall thickness of a part is required, if the thickness is more than __________ mm.
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Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.
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In a __________ rivetted joint, the rivets in the various rows are opposite to each other.
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Pick out the wrong statement:
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Generally, elliptical dished heads
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Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower.
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The circumferential (hoop) stress in a thin walled cylinderical vessel under internal pressure is
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for fully open gate valves would be -
LMTD correction factor is used in heat exchanger design for
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Floating head heat exchangers are used for the
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A.
The tensile strength of a brittle material is less than its compressive strength.
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B.
The compressive strength of a ductile materia] is less than its tensile strength.
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C.
In a thick cylindrical shell, the hoop stress is maximum at the inner radius.
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D.
The value of crushing load is more than that of buckling load for long colmns.
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A.
are manufactured on 2:1 ratio of major to minor axis and is recommended to be used for pressure vessels operating above a pressure of 1.5 MN/m2 .
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B.
resist half the pressure rating compared to hemi spherical head provided on the cylindrical shell of the same thickness and diameter.
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C.
are approximately as strong as seamless cylindrical shell having the corresponding I.D and O.D.
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D.
all (a), (b) and (c)
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A.
Plate tower is perferred, if interstage cooling is required to remove heats of reaction or solution.
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B.
Plate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids.
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C.
The total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty.
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D.
In operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes.
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