This report part 3 covers the final Phase of a three Phase HSE funded study into the structural design basis for Totally Enclosed Motor Propelled Survival Craft (TEMPSC). Part 1 addresses Structural Design Basis Determination, Part 2 Design Events and Failure Capabilities. Emphasis is placed on typical TEMPSC that are currently in-service in the UK Sector of the North Sea, with the generic TEMPSC as a 50-man, Glass-fibre Reinforced Polymer (GRP), side-on davit-launched craft, stationed on a fixed steel platform. Such a craft would be typical of lifeboats installed in the early to mid 1980's and therefore designed and manufactured in accordance with the pre-1986 amendments to the 1974 Safety of Life at Sea (SOLAS) regulations. The objective of this third, and final, phase is to estimate the likelihood of the generic TEMPSC suffering structural failure during each of six design events, identified in phase 2 of this project, and quantifying the safety margin between the design load and estimated average strength of the TEMPSC.
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