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Rigs have multiple options available to them. Primary method of evacuation is Helicopter, it’s the fastest, secondary is life boats, tertiary is access to the sea by ladders, descending devices, jumping. The inflatable life rafts may or may not be deployed. The tertiary methods are uncontrolled due to a rapid escalation of events that prevent primary and secondary abandonment. On some rigs, rig to vessel transfer is primary method: vessel pushing into dedicated sea level access platform or basket transfer by crane from rig to vessel.
The net descenders work but are very slow despite manufacturers claim. Colleagues had to abandon from a major gas release, in ice, onto the deck of an ice breaker and a claimed 30 minute abandonment was still going g some 2 hours later with lots of gas venting.
The net descenders work but are very slow despite manufacturers claim. Colleagues had to abandon from a major gas release, in ice, onto the deck of an ice breaker and a claimed 30 minute abandonment was still going g some 2 hours later with lots of gas venting.