Fractional columns are designed to condense vapors drop out of the column and supply the column with reflux. Can be made of AISI 304 stainless steel or M2 copper

| Designation of the fractional column | Heat exchange area, m2 | Working pressure, Mpa | Dimensions, not more than | Fractional column's mass, kg, not more than | ||
| Tube side | Tube space | Diameter, mm | Height, mm | |||
| RFC-3,6 ST | 3,6 | 0,03 | 0,03 | 390 | 1780 | 140 |
| RFC-7,2 ST | 7,2 | 485 | 1780 | 280 | ||
| RFC-12,5 ST | 12,5 | 585 | 2280 | 470 | ||
| RFC-16 ST | 16 | 585 | 2280 | 600 | ||
| RFC-20 ST | 20 | 635 | 2320 | 750 | ||
| RFC-25 ST | 25 | 685 | 2320 | 930 | ||
| RFC-50 ST | 50 | 935 | 3500 | 1900 | ||
| RFC-63 ST | 63 | 1035 | 3500 | 2390 | ||
| RFC-100 ST | 100 | 1235 | 3500 | 2860 | ||