On March 15, 2001, the P-36 Platform had an accident, which led to the sinking of the unit. The platform was in operation in Roncador Field, at Campos Basin, in 1360 m water depth. This paper describes the analyses performed to validate the hypothesis that the first main event in the accident was the structural rupture of the starboard Emergency Drainage Tank. This tank was located inside the aft-starboard column of the platform. With the internal shell tank rupture due to overpressure, equipment and piping inside the column were damaged, causing the flooding of pontoon and column with water, raw oil and gas, that ignited resulting in the second event, an actual explosion.

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