The MoEFCC has granted environmental clearance for revamping of the crude distillation unit (CDU) along with naphtha splitter facilities (NSF) and naphtha splitter unit (NSU) at the Guwahati refinery project. The project involves the expansion of CDU, NSF and NSU units from 1 mtpa to 1.2 mtpa by Indian Oil Corporation Limited at the Guwahati refinery in Kamrup district of Assam.