The refinery had an original design capacity of 2.5 million
tonnes per year which was increased to 3.3 million tonnes per year in 1973. Production of
liquefied petroleum gas (LPG) and
aviation turbine fuel (ATF) commenced after this expansion. Refining capacity was further enhanced to 4.5 million tonnes per year in November 1984 when a fluidized catalytic cracking unit (FCCU) of 1 million tonnes per year capacity was added. In Dec 1994, refining capacity was increased to 7.5 million tonnes per year along with revamp of FCCU to 1.4 million tonnes per year. A fuel gas de-sulphurisation unit was installed as part of this project to minimise
sulphur dioxide emission. CRL entered into petrochemical sector in 1989 when aromatic production facilities with a design capacity of 87,200 tonnes per year of benzene and 12,000 tons per annum of toluene was commissioned. In the year 2000, a 2 million tonnes per year Diesel Hydro De-sulphurisation (DHDS) plant was added to reduce the sulphur content in
diesel. In August 2010, the refining capacity was further increased to 9.5 million tonnes per year. A captive power plant of 26.3 MW was commissioned in 1991. An additional captive power plant of 17.8 MW was commissioned in 1998 thus making the refinery self-sufficient in power. An LPG bottling plant of capacity 44,000 tonnes per year was commissioned in 2003. A
Bitumen Emulsion plant of 10000 tonnes per year capacity has also been commissioned in 2004. A
Biturox Bitumen Oxidation Unit of 378,000 tonnes per year capacity was successfully commissioned and started-up in 2008. == Merger with BPCL ==