"RIL is planning to shut down one of its four crude distillation units, for maintenance and inspection (M&I) activities from March 20, 2014 for about 3.5 weeks," the company said in a statement.
RIL owns and operate two refineries at Jamnagar with a combined capacity of 62 million tons.
"As a normal practice, opportunity would be utilised to carry out necessary modifications to improve the reliability and performance of the unit," it said.
RIL said the planned shutdown period will also be utilised for catalyst replacement of VGO and Naphtha hydrotreater. "The rest of the Refinery will continue at normal levels of operations.