Chemical Engineering :: Process Equipment and Plant Design
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In a shell and tube heat exchanger, triangular pitch arrangement as compared to square pitch arrangement
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Pick out the wrong statement about routing of fluids in a shell and tube heat exchanger.
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The necessary wall thickness for a metallic storage vessel is a function of the
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In a multiple effect evaporator system having 'n' effects, the amount of water evaporated per unit surface area in approximately equal to __________ times that in a single effect.
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Pick out the wrong statement
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Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.
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Weep holes provided in the plates of a distillation column
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Steam is preferred to be used as a heating medium in heat exchangers, because of its
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__________ shapedroof is the most commonly used roof for cylinderical storage tanks.
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Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.
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A.
results in higher shell side pressure drop.
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B.
can accomodate less number of tubes for a given shell diameter.
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C.
facilitates easier shell side cleaning; hence is more suitable for handling high dirt factor shell side fluid.
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D.
creates relatively lower turbulence on the shell side resulting in lower shell side heat transfer co-efficient.
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A.
In a flanged and standard dished head, the crown radius is ≤ shell outside diameter.
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B.
In a flanged and shallow dished head, the crown radius is > shell outside diameter.
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C.
Flat head covers are most suitable for larger vessels operating at very high pressure.
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D.
Flanged only head is a type of flat head in which gradual change in the shape at the centre results in reduced local stresses.
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A.
It is unsuitable for concentrating those liquids, which form a scale or deposit salt.
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B.
It is suitable for process, in which the final product is a liquor instead of solid.
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C.
Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres.
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D.
Liquor flows inside the tube, while the steam is outside submerging the tube.
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A.
facilitate draining out liquid from a tray when the unit is not in operation.
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B.
are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid.
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C.
must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation.
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D.
all (a), (b) and (c).
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A.
Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column.
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B.
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 ; hence insulation required is less.
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C.
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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D.
Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm2 .
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