(A) The downcomer design and the residence time in the downcomer is almost same for sieve plate and bubble cap columns
(B) Weir length for a bubble cap plate is the same as that for the sieve plate
(C) Weir height for a bubble cap plate column is the same as that for a sieve plate column
(D) Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the sieve plate

