Process Equipment and Plant Design
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/2 to 1/4th
1/5-1/10th
1/20-1/30th
1/10-1/15th

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Process Equipment and Plant Design
Seamless pipe is made

From rolled strips formed into cylinders and seam-welded
Both B and C
By extrusion & casting into static and centrifugal molds
By forging a solid round, piercing it by simultaneously rotating & forcing it over a piercer point and further reducing it by rolling gas drawing

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of the distillation column.

If sufficient slot area is not provided, the gas may pass through the skirt clearance
The purpose of the slot is to disperse the gas into the liquid in the form of small bubbles
None of these
Generally, a skirt clerance of 0.5" to 1.5' is recommended to prevent plugging of the slots by residue build up

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