In Figure 1.22 the distribution of initiating events is shown for submersible rigs, which
normally operate as production facilities.
Drifting grounding
3%Weather, flooding
10%Structural damage
7%
Capsizing
10%
Collision
3%
Fire / explosion
14%Other
3%Blowout
50%Figure 1.22: Distribution of initiating events for failures of submersible rigs (Bertrand and Escoffier
(1987)).
For these rigs structural failures are far less important and here the dominating initiating event
is blow-out.
Other
10%
Weather, flooding
9%Drifting, grounding
20%
Structural damage
13%
Capsizing
3%Collision
11%Fire / explosion
6%Blowout
28%Figure 1.23: Distribution of initiating event for failures of semi-submersible rigs (Bertrand and
Escoffier (1987)).
Semi-submersible rigs are more exposed and vulnerable to the weather conditions, which may
also be seen in Figure 1.23. For these structures weather, drifting and grounding are important
initiating events together with blowouts and collisions.
Finally, in Figure 1.24 the distribution of initiating events for failures in fixed offshore
installations is shown. Again it is seen that blowouts are important, but also fire and
explosions contribute significantly.