Welcome to European Tribune. It's gone a bit quiet around here these days, but it's still going.
The BOP, when open, has the same internal diameter as the largest casing. Normally, everything passes through the BOP. It's pretty big, I would guess, repeat, guess, that it's on the order of about 75 cm in diameter.

Right now, though, since they already have activated (or tried to activate, or partially activated) the various annular and shear rams, it's tough to say what is going on inside. Probably there are several very irregularly shaped restrictions through which the oil is flowing. They could take off the BOP, at which point the drill string would probably blow out (several km of steel rod flying through the air), and the flow would increase because of the reduced restriction...

by asdf on Fri Jun 18th, 2010 at 09:59:43 AM EST
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