A major explosion and fire have hit one of India’s largest refineries just as the country is pushing its plants above normal operating rates to offset tight fuel supplies caused by the Iran war. One worker was killed, and at least eight others were injured Wednesday after a high-pressure Cold Separator ruptured in the Coker Hydrotreater Unit at Mangalore Refinery and Petrochemicals Ltd.’s 15-million-tonne-per-year refinery in Mangaluru, according to MRPL and local authorities. The explosion occurred around noon local time and…