[QUOTE=company man 1;37648]Is it feasible/possible to have a back up BOP stack on the rig so the rig can keep one maintained in order to change out in the event of a major repair that can’t be done subsurface?[/QUOTE]
Sure, but don’t they cost like 30 or 40 million? Not to mention weighing 450,000 lbs. Not reasonably feasible for every rig, but I would have a spare if I was in charge of 3 or more rigs…