Paper Title
CORROSION EVALUATION TO ASSESS THE INTEGRITY OF ABOVEGROUND STORAGE TANK: FUEL STORAGE TANK CASE STUDY

Abstract
The petroleum industry has high potential hazards with flammable materials, toxic to human health or the environment. Equipment in the oil and gas industry operates at very high pressure and temperature levels, most of those operating above their design life. That aging mechanisms are a significant issue in major hazard accidents. The research method used is a case study approach. The technical data used in the study is a storage tank Tag No. 6 in fuel terminal, fixed cone roof type has a capacity of 1000 KL made in 1973. The average age of the storage tank in Indonesia is above the design life, where potential degradation of plants and equipment due to age-related mechanisms is corrosion—an inspection referenced API 653. From the inspection results on storage tank No.6, visual inspection, and wall thickness measurement using UT (Ultrasonic Test) on the shell and roof, a feasibility evaluation was carried out to calculate the remaining life of the equipment, which was determined from the corrosion rate. The actual minimum thickness measured for the roof is 2.13 mm. From the calculation results, the storage tank is not feasible to continue operating until the roof is repaired or replaced. Where based on the evaluation, these conditions affect the integrity of the storage tank. If repairs have been made, the remaining life will rise to the weakest part. The coating on the roof tank is in poor condition. The peeling off of the coating makes the shell appear scaling. Thickness measurements using the UT method are carried out to determine the thickness and integrity of the roof. Thickness results indicate that thinning has happened significantly. Keywords - Storage Tank, Corrosion, Thickness, Remaining Life