The two succumbed while undergoing treatment at Seven Hills Hospital. Thirty-six injured workers were being treated in various corporate hospitals in the city, they said.
Around half a dozen of them have received more than 70 per cent burns and are said to be in critical condition.
The blaze started in the sprawling complex at around 4 pm, killing two workers. As per preliminary reports, the fire broke out due to blasting of cooling tower due to a short-circuit, the sources said.
Union Minister of State for Petroleum Panabaka Lakshmi today visited the fire-hit refinery. She also went to the hospitals where the injured were undergoing treatment, and enquired about their condition.
The extent of damage to the refinery-cum-petrochemical complex was being ascertained.