The 1A/1M cat cracker at the Ryazan' Refinery OJSC (Tyumen' Oil Company) was exhaustively revamped. This cat cracker, designed by Grozgiproneftekhim in 1960, was started tip in 1967. According to the plan, its capacity would be 750, 000 tons/year. After more than 30 years, refinery specialists knew how to increase the output of the cat cracker to 900,000 tons/year, ensuring high enough takeoff (similar to43% in feedstock) and good quality (research octane number of 87-95) of the naphtha cut.