Typical Number of Columns as a Function of Tank Diameter for Internal Floating Roof Tanks With Column Supported Fixed Roofs a

Tank diameter range (D in feet) Typical number of columns, (N C ) 0 <D ≤85 1 85 <D ≤100 6 100 <D ≤120 7 120 <D ≤135 8 135 <D ≤150 9 150 <D ≤170 16 170 <D ≤190 19 190 <D ≤220 22 220 <D ≤235 31 235 <D ≤270 37 270 <D ≤275 43 275 <D ≤290 49 290 <D ≤330 61 330 <D ≤360 71 360 <D ≤400 81 a Data in this table should not supersede information on actual tanks.