Qualla: Petrobras 36

Petrobras 36: Introduction

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Brazil_location_map.svg: NordNordWest derivative work: Виктор В (talk), CC BY-SA 3.0. At 12:22 AM on 15 March 2001, a tank ruptured in the starboard aft column of the largest oil platform in the world. At 12:39 AM, seventeen minutes later, the fumes that escaped from it ignited and killed eleven men. A semi-submersible production unit named Petrobras 36, called P-36 for short, had been working the Roncador field 125 kilometers off the coast of Brazil for less than a year. It sat in water 1,360 meters deep - the kind of depth that in 2001 was still considered an engineering frontier. Five days after the explosion, after Dutch salvage teams worked through the nights pumping nitrogen and compressed air into flooded compartments to keep the rig upright, the platform gave up and rolled over. It sank at 11:40 AM on 20 March, in view of the thirteen rescue ships that had gathered around it. The immediate cause was a leaking valve and a vented tank that should not have been isolated the way it was. The deeper causes, investigators would later conclude, lived in the management culture of a state oil company running faster than its own safety systems could keep up with.

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Image: Brazil_location_map.svg: NordNordWest derivative work: Виктор В (talk) | CC BY-SA 3.0

Petrobras 36: The Rig That Had Several Lives

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Ricardo Stuckert/PR, CC BY 3.0 br. The platform was built at the Fincantieri shipyard in Genoa between 1984 and 1994. It was originally called SANA 15,000, a speculative project built without a committed buyer. A Friede and Goldman L-1020 Trendsetter design, rated for depths of 500 meters. When Midland and Scottis...

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Image: Ricardo Stuckert/PR | CC BY 3.0 br

Petrobras 36: What Broke and What Caught Fire

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Ricardo Stuckert/PR, CC BY 3.0 br. The starboard aft column held an emergency drain tank - an EDT - a 450 cubic meter vessel meant for temporary storage of water and oil during maintenance on the topsides. In mid-March 2001, that tank had been mechanically isolated because its pump had been pulled for maintenance....

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Image: Ricardo Stuckert/PR | CC BY 3.0 br

Petrobras 36: Five Days of Trying to Save It

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Ricardo Stuckert/PR, CC BY 3.0 br. One hundred and seventy-five people were on the platform when the gas exploded. The 85 crew members began evacuating non-essential personnel at 1:44 AM, using a crane and a transfer basket. In two and a half hours, 138 workers were moved 12 kilometers to the FSO P-47 that served ...

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Image: Ricardo Stuckert/PR | CC BY 3.0 br

Petrobras 36: What the Investigations Found

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit JudeFawley, CC BY-SA 4.0. Three major investigations followed. The National Petroleum Agency and Brazilian Navy released their joint report in July 2001. The Minas Gerais engineering council issued its own report in October 2001. The Chamber of Deputies commission published its findings in March 2002. Non...

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Image: JudeFawley | CC BY-SA 4.0

Petrobras 36: What the Accident Changed

Thu, 16 Apr 2026 00:00:00 GMT

Photo credit Ricardo Stuckert/PR, CC BY 3.0 br. The P-36 disaster became a catalyst for reform of Brazilian offshore oil and gas regulation. In 2007 the ANP issued Resolution 43, establishing an operational safety regime for offshore drilling and production installations based on seventeen key management practices. Internation...

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Image: Ricardo Stuckert/PR | CC BY 3.0 br