Process Equipment and Plant Design
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").

Three fourth
1.5 times
Equal to
Half

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Process Equipment and Plant Design
A stuffing box is used for

Facilitating smooth opening and closing of a valve
Reducing the resistance of fluid flow
Absorbing the contraction/expansion of pipeline due to temperature changes
Prevention of fluid leakage around moving parts

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a long tube vertical evaporator.

Steam is fed to the shell, whereas the liquor is filled inside the tube
None of these
Liquor level is maintained at l/3rd to 1/2 of the height of the tube
Tube dia is 3-6 cms, while tube length in 3-6 metres

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