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Guwahati Refinery located among the picturesque surroundings near Brahmaputra River in Guwahati city in North Eastern part of India. It is the country’s 1st Public Sector Refinery as well as IndianOil’s, serving the nation since 1962. Built with Romanian technology available in the late 50s, the initial crude processing capacity of the Refinery was 0.75 Million Metric Tonnes Per Annum (MMTPA). The Refinery was initially designed to process low sulphur Assam crude in CDU along with secondary processing units, Delayed Coker Unit (DCU) of 0.33 MMTPA capacity and Kerosene Treating Unit (KTU) of 0.23 MMTPA capacity. Subsequently capacity of the refinery was enhanced to 1.0 MMTPA in 1986. DCU capacity was enhanced to 0.44 MMTPA in 2000. Further, the Refinery expanded its capacity from 1.0 MMTPA to 1.2 MMTPA in 2023 to further boost the development of energy sector in the region.

INDMAX Unit, a technology developed by IndianOil R&D Centre for upgrading heavy ends to LPG, gasoline and diesel was commissioned in June 2003.

The following units were added to meet the fuel specifications.

• To produce Euro-III quality MS Isomerisation Unit, Naphtha Hydrotreater Unit TMTPA, Naphtha Splitter Unit, and Indmax Gasoline Unit were commissioned in 2010.
• INDAdept-G Unit (IOC - R&D Technology based on Adsorption) was commissioned in 2017 for treatment of Heavy Gasoline from Indmax to comply to BS-IV MS norms
• To produce BS-VI/Euro-VI quality MS/HSD a New indSelectG unit (IOC - R&D Technology) was commissioned in 2022 along with revamp of existing HDT unit, Hydrogen unit and Isomerization Unit.

Upcoming Projects: A New Semi regenerative CRU unit of capacity of 90 kilo tonnes per annum has been approved and is expected to be completed in 2025. The commissioning of new 90 KTPA Semi-Regenerative CRU will remove the dependency of the Refinery for importing reformate from other IOCL refineries for production of MS.

Major products:Liquefied Petroleum Gas (LPG), Motor Spirit (MS), Ethanol Blended Motor Spirit (EBMS) , High Speed Diesel (HSD), Aviation Turbine Fuel (ATF), Sulphur, Pipeline Compatible Kerosene (PCK), Reformer Naphtha (RN), Superior Kerosene (SKO), Low Sulphur Low Aromatics (LSLA) and Raw Petroleum Coke (RPC).

Mode of Product Dispatch

1).Pipeline: Guwahati Siliguri Pipeline (GSPL) for Motor Spirit (MS), Ethanol Blended Motor Spirit (EBMS), Superior Kerosene Oil (SKO) and High Speed Diesel (HSD)

2).Tanker trucks for LPG, Naphtha, EBMS and ATF.