According to an HPCL employee, the blaze is believed to have erupted within the refinery's premises. Firefighting operations are underway. A fire erupted at HPCL's Visakhapatnam refinery in Andhra Pradesh late Monday night. Firefighting teams controlled the blaze within an hour, with no casualties. A fire at HPCL’s Visakhapatnam refinery late Monday was reportedly confined to a sulphur pitch tank at its Residue Upgradation Facility.