Process piping play an extremely important rolein Petroleum refineries throughout the world as a means forcarrying Hydrocarbons from one location to other. Theseprocess piping are subjected to Corrosion over a period ofoperational time, which is the destructive attack of materialby reaction with its service fluids containing corrodents suchas Sulphur, H2S, HCl, CO2, organic and inorganic acids andexternal environments thus causing a natural potentialhazard associated with oil and gas transportation facilities.Various potential damage mechanisms are identified for preheated crude inlet piping to atmospheric distillation columnusing American Petroleum Institute standardssuch as API 581and API 571. These damage mechanisms consist mainly ofHigh Temperature Sulfidic and Naphthenic acid corrosion.Corrosion rates for this damage mechanism is identified fortwo crudes namely Kuwait crude and Arab Extra Light Crudeusing API 581. Retirement thickness for this piping iscalculated using ASME B 31.3. Further remaining life of thispiping is estimated using corrosion rate, present thickness andretirement thickness of the piping.