Chemical Engineering :: Process Equipment and Plant Design
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For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by
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Pick out the correct statement.
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Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is
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Pick out the wrong statement pertaining to the design of a basket type evaporator.
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Pick out the wrong statement pertaining to the design of the bubble cap tray of a distillation column to give stable operation and even vapour distribution.
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Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.
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A stuffing box is used for
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Pressure drop (Δp) and the superficial gas mass velocity (G) in case of packed absorption tower operating in the preloading range are related as
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Pick out the wrong statement.
In an agitated vertical cylinderical reaction vessel, the
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A.
When highly corrosive fluids are to be handled, the plate towers prove to be cheaper and easier to construct than packed tower.
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B.
Packed towers are generally preferred over plate towers, if the liquids have a foaming tendency.
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C.
The pressure drop through the packed towers is generally more than the pressure drop through plate towers designed for same duty.
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D.
none of these.
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A.
The pressure drop due to the caps & slots and the static submergence should be as high as practicable for reasonable operation.
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B.
Tendency towards stable operation is increased by increasing the skirt clearance of the caps, lowering the rate of liquid flow per unit plate width or increasing the spacing between the caps.
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C.
The dimensionless ratio of liquid gradient to pressure drop head caused by the bubble cap assembly should be less than 0.4.
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D.
none of these.
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A.
ratio of liquid depth to tank diameter (i.e. the filling ratio) recommended for most purposes is 1.
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B.
filling ratio for dispersing gas in a liquid is 2 for sufficiently long contact period.
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C.
flat bottom and conical bottom vessels have low agitation efficiency for agitation of heavy solids in liquids.
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D.
dished bottom vessel has very high power consumption.
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