Abstract
This paper reviews the basic stability considerations applied in the design of semisubmersible drilling units. Rules and regulations governing the stability of mobile offshore drilling units (MODU's) were first introduced in the late 1960's. There has been considerable debate over the level of safety achieved in the present generation of MODU's based on existing rules. The assumptions implied in the early rules are discussed and the merits of a "yardstick" approach to the rules are presented. The paper summarizes the evolution of stability rules for mobile offshore drilling units and describes how the rules have changed due to public reaction to several major disasters.
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