>> Too bad those valves are automated to be normally closed.
“are not automated”
In other words, a safety valve should automatically close when not signaled to stay open.
You can't do that with blowout preventers because of the serious entailed consequences of an inadvertent activation of the rams. Each BOP stack has an inflatable "bag"-type preventer called a Hydril, which is separate from the main stack. There is also a TIW valve, a kind of check valve, inside the drillpipe. Higher rated are the hydraulic ram sets, which usu. include a set of
This stuff is serious equipment, very bulky and heavy-duty.
Rams are tested religiously, and the MMS and Coast Guard sometimes come out to look over the drilling contractor's men's shoulders. This is no place to play. Blowout preventers stacks are one of the most serious pieces of safety equipment in the oil patch, and when gas comes to surface, people's lives depend on their working first time, every time.
This time, they didn't -- and the Coasties and MMS and BP are going to know why.