Chemical Engineering :: Process Equipment and Plant Design
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The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.
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Oxygen carrying pipelines in chemical industries are coloured with __________ colour.
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Normally, the ratio of the total riser area to the tower cross sectional area (for bubble cap towers of diameter more than 3 ft) is around
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Pick out the wrong statement about the design of seive plate column and the bubble cap column.
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Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.
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The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.
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The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about __________ kms.
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Pick out the wrong statement pertaining to a shell and tube heat exchanger.
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Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if
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A.
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns.
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B.
Weir length for a bubble cap plate is the same as that for the seive plate.
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C.
Weir height for a bubble cap plate column is the same as that for a seive plate column.
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D.
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate.
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A.
The minimum value of baffle spacing is 50 mm.
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B.
The maximum value of baffle spacing is equal to the I.D. of the shell.
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C.
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these.
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D.
Disk and doughnut baffle is the most commonly used baffle.
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