Panipat Refinery (Near Delhi)

Digboi Refinery (Upper Assam)

The small town of Digboi in the remote north eastern corner of the country is the birth place of the Oil Industry in India. Digboi Refinery, commissioned on 1901. It is India's oldest operating refinery and one of the oldest operating refineries in the world and termed as the "Gangotri of the Indian Hydrocarbon sector." Earlier owned and operated by the Assam Oil Company Limited/Burmah Oil Company, it came into the fold of the Indian Oil Corporation Limited and became the Assam Oil Division of Indian Oil Corporation Limited.

Its initial capacity was 0.028 MMTPA, which was increased to 0.5 MMTPA in 1940. Subsequently, Digboi Refinery was modernized in phases and capacity was augmented to 0.65 MMTPA in 1996. A number of new units have been commissioned which include new Crude Distillation Unit, a new Delayed Coking Unit, a Catalytic Reforming Unit, a new Solvent De-waxing Unit and a Wax Hydro finishing Unit. The refinery has also installed a Hydrotreater Unit in 2003 to improve the quality of diesel.

Digboi refinery processes High Wax Content Crude and produces Paraffin Wax in addition to distillates and other heavy ends. This is the only refinery in North East having facility to produce high quality Paraffin Wax. Relocation of Wax Pellatization Unit from BR to DR was done in 2013.