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?
(A) 1/10-1/15th
(B) 1/5-1/10th
(C) 1/20-1/30th
(D) 1/2 to 1/4th
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