orifice type distributor c/w risers are used. For small columns (< 800mm , a pan construction can used where the distributor is fixed to lugs welded to the column. Alternatively a plate construction is used where the distributor is clamped to a full support ring. The distributors are made in one or two pieces for installation through column body flanges.

For larger columns (> 8000mm  the distributor is made in sections for installation through column man-holes. The distributor is clamped to a full support ring welded to the column shell. Consequently the distributor levelness is dependent upon the levelness of the support ring.