NDT and equipment health assessment with regular condition monitoring in Oil Refinery has helped in achieving high degree of reliability of Refinery equipments. Such advanced Non-Destructive Testing for reliable inspection and Interpretations of service damage in the equipments over a period have provided adequate fitness for purpose and plant safety. Special advanced NDT’’S like TOFD, IRIS , AUS LFET, AET , RFET, OLCM etc. have been adopted at regular intervals during plant turn around shutdown.. All these special NDT’s have been found successful and implemented for maintaining Reliability, quality , Safety , Life extension ,Predictive maintenance of refinery equipments . The need for such NDT’s is derived from complexity of refinery which includes operation of secondary processing units at High temperature & pressure like FCCU, Hydro cracker, DHDS, CRU etc. These process plants handle hazardous and corrosive service environment like H2, wet H2S, CO, erosive catalysts, Hydrogen gas causing material degradation by Low temp. / High temp. Hydrogen induced cracking, sulphur corrosion, Naphthanic acid corrosion, etc.