Abstract
Lifeboats are a ubiquitous means of evacuation fitted to offshore petroleum installations and marine vessels. For lifeboats operating in ice environments, the magnitude of local ice loads and the structural integrity of these crafts under ice loading are not well understood. To address these gaps, full-scale measurements relating to lifeboat-ice interactions were collected during a field campaign carried out in 2013. During this trial, the local ice loads on the hull of a Totally Enclosed Motor Propelled Survival Craft (TEMPSC) operating in pack ice conditions were measured using instrumented load panels. This full-scale field data provides the foundation for risk-based design load estimation and has been analyzed using the event-maximum method of local ice pressure analysis. This approach is based on probabilistic methods developed for the analysis of ice loads measured on icebreakers, which have been adapted for ice interaction scenarios involving small vessels. Results from this work provide improved insight into the nature of loads on lifeboats operating in ice-covered waters and help to inform design methodology for these vessels.
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