The rig, the rig, the rig is on fire.
The rig, the rig , the rig is on fire (add your own music)
Luckily rig fire is not the most occurent reason to evacuate.
I recall some collisons between semi-subs and a supplier, making them less stable.
On the Dutch side i remember a freighter with 1 engine inoperable. It was the only engine.
The ship came a drift in a storm and was on collison course with the accommodation rig Seafox 2. (200 POB)
Although they had some hours response time, It was at night and initially only 2 choppers could be made available. As the ship drifted by at 500 meter, we might probably never know if 2 choppers would have been enough if complete evacuation would have been required.
(Somebody out there with more knowledge of this case?)
As long as you have only 2 helis available the turn around time is hardly an issue.
They will alternate between the danger and safe rig.
Other posters have already shown turn around time is probably shorter than the flight time.
So up to 4 helis will not make turn around time critical.
(2 in the air, 1 on danger and 1 on safe deck)
If one of the helis would have to refuel it will be done on the safe rig.
So that could hold up the other aircraft.
So look at
1) number of aircraft that can be made available,
2) distance to nearest safe rig(s) (with re-fueling)
If you have to pull it off by saving 1 minute on deck, I think it is an unsafe operation of the rig operator
SLB