Storage tanks are critical elements within oil facilities not because of their failure rate, but because of their critical function and the high environmental consequences when they fail. The presented analysis is allows determining the probability of failure of storage tanks considering the most probable failure scenarios of this equipment. The utilized methodology considers the uncertainties associated with material degradation mechanism such as general corrosion, pitting and cracking induced by corrosion. The analytical formulations of the time dependent degradation of the isolated mechanisms and the system conformed by the conjunction of them are considered. Obtained results allow determining the contribution of the individual scenarios in the system reliability. Additionally, the probability of failure results and the maintenance cost are used to determine the optimum inspection time based on minimum costs criterion. Scenario 1: Release due to tank bottom corrosion. Scenario 2:release due to shell cracking induced by corrosion. Scenario 3: Overfill releases/spill through tank vents. Scenario 4: Slow release though tank fitting or pressure release system. Scenario 5: Rapid shell failure - collapse. The optimum inspection time was 16 years (minimum total costs per unit of time), which is higher that the inspection interval of 10 yers recommanded by the standard API 653 representing a tremendous amount of saving for the owner.
Reliability aspects of corrosion in oil storage tanks
Zuverlässigkeitsaspekte der Korrosion in Öllagertanks
2003
10 Seiten, 5 Bilder, 7 Tabellen, 42 Quellen
Aufsatz (Konferenz)
Englisch
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