Oil spill: BP had wrong diagram to close blowout preventer | McClatchy.
Choice quotes:
In the days after an oil well spun out of control in the Gulf of Mexico, BP engineers tried to activate a huge piece of underwater safety equipment but failed because the device had been so altered that diagrams BP got from the equipment’s owner didn’t match the supposedly failsafe device’s configuration
…“When they investigated why their attempts failed to activate the bore ram,” Stupak said of BP engineers, “they learned that the device had been modified. A useless test ram _ not the variable bore ram _ had been connected to the socket that was supposed to activate the variable bore ram.”
“An entire day’s worth of precious time had been spent engaging rams that closed the wrong way.”
clearly not the cause, but there’s a DR lesson here for sure.