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Chemical Engineering - Process Equipment and Plant Design

Exercise : Process Equipment and Plant Design - Section 8
26.
Pick out the wrong statement.
If sufficient residence time (around 8 seconds) is not proivided to the downcoming liquid in the downcomer, it may entrain some vapour.
The liquid head in the downcomer should not be greater than one half the plate spacing to avoid flooding.
The dischare end of the downcomer must project far enough into the tray liquid so that no gas bubbles can enter the open end and by pass the bubble caps.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Pick out the wrong statement pertaining to shell and tube heat exchanger.
Clearance between shell & baffles and between tube & baffles should be minimum to avoid by-passing of the fluid, but it should be enough to permit the removal of tube bundle.
Baffles are supported independently of the tubes by tie rods and positioned by spacers.
Tie rods are fixed at one end in the tube sheet by making blind holes and the minimum number of tie rods is 4 with at least 10 mm diameter.
Bracket supports are used for horizontal shell, while saddle support is used for vertical shell.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
Wind load consideration in the design of a support can be neglected, when the vessel is
tall (say 30 metres), but is full of liquid.
tall but empty.
short (< 2 m) and housed indoor.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
Souders Brown equation given by, , is used for the calculation of the __________ in a continuous distillation column.
diameter of the bubble cap column
diameter of the seive plate column
tray pressure drop
residence time in the downcomer for the disengagement of entrained vapour
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
The ratio of volumes of the mixed reactor to the plug flow reactor (for identical feed composition, flow rate, conversion, and for all positive reaction orders) is always
1
< 1
>1
equal to the order of reaction
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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