https://www.thehindu.com/news/national/andhra-pradesh/hpcl-visakh-refinerys-residue-upgradation-facility-is-a-major-milestone-for-ap-says-n-chandrababu-naidu/article70473240.ece
Visakh Refinery’s residue upgradation facility is a major milestone for A.P., says CM - The Hindu
residue upgradation facility
https://www.thehindubusinessline.com/companies/hpcl-commissions-residue-upgradation-unit-at-vizag-refinery-boosts-distillate-output/article70473574.ece
HPCL commissions residue upgradation facility at Vizag refinery - The HinduBusinessLine
HPCL commissions a 3.55 MTPA residue upgradation unit at Vizag refinery, boosting distillate yields, margins and reducing dependence on fuel imports.
residue upgradation facility