country's first hydrocracker unit of 1.2 million tonnes per year along with feed preparation unit-2 and hydrogen generation unit-1 (GHC Complex), for conversion of heavier ends of crude oil to high value superior products. India's first diesel hydrodesulfurisation unit to reduce sulfur content in diesel was commissioned in June 1999. A methyl tertiary butyl ether unit was commissioned in September 1999 to eliminate lead from motor fuels. The facility conceptualised and commissioned South Asia's largest centralised effluent treatment plant by dismantling the four old ETP's (Effluent Treatment Plant) in June 1999. By September 1999 with the commissioning of an atmospheric distillation unit, Gujarat Refinery further augmented its capacity to 13.7 million tonnes per year making it the largest public sector undertaking refinery of the country. A project for production of linear alkyl benzene from kerosene streams was implemented in August 2004. It is the largest grassroots single train Kerosene-to-LAB unit in the world, with an installed capacity of 1.2 million tonnes per year. To meet future fuel quality requirements, MS quality improvement facilities were commissioned in 2006. The Residue Upgaration Project undertaken by the Gujarat Refinery was completed by 2011 which increased the high sulfur processing capacity of Gujarat refinery, improved the distillate yield as well produce BS III & IV quality of MS and HSD. The Residue upgradation project came in two parts namely, the south block which consisted of HGU-III, SRU-III, DHDT and ISOM units and the north block consisted of VGO-HDT and DCU units. To support the new units a new Co-Generation Plant (CGP) and Heat Recovery Steam Generation (HRSG) were also commissioned. Description The refinery's facilities include five atmospheric crude distillation units. The major secondary units include Catalytic Reforming Unit (CRU), Fluidized Catalytic Cracking Unit (FCCU)and the first hydrocracking unit of the country. Through a pipeline to Ahmedabad and a pipeline connecting to the BKPL (Barauni-Kanpur Pipeline) pipeline and also by rail and truck, the refinery primarily serves the demand for petroleum products in western and northern India. When commissioned, the refinery had an installed capacity of 2 million tonnes per year and was designed to process crude from Ankleshwar, Kalol and Nawagam oilfields of ONGC in Gujarat. The refinery was modified to handle imported and Bombay High crude. The refinery also produces a wide range of specialty products such as benzene, toluene, MTO, food grade hexane, solvents and LABFS. The Gujarat Refinery is the first