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Bubble of methane triggered rig blast
EyePee. One of the best technical articles I've read. It clearly describes events and causes without being tendentious.

In a massively ironic event, a group of BP execs were holding a party to celebrate the rig's safety record. A catastrophic blowout methane bubble surged into the rig and was ignited by "exposed ignition sources" (the cake with a candle for each year?).

That caused the initial explosion. Subsequently, the methane cloud enveloped the rig, causing several large engines to overspeed, apparently due to too rich a mixture. They exploded, tore off the rig, and triggered more explosions.

RTWT

Posted by: KBK 2010-05-08
http://www.rantburg.com/poparticle.php?ID=296327