The ABS MODU Rules were first published in 1968 and written for all types of drilling units. These Rules were unique in that as they were the first to include afloat intact and damage stability as a criterion for Classification.

History has shown that jack-ups are most vulnerable when they are afloat, particularly when under ocean tows or field moves in areas such as the North Sea where weather is difficult to predict. A number of rig losses during transit have been recorded, but no loss of life has been recorded in almost thirty years. This has allowed Industry and Regulatory bodies to work in the revisions of Rules and regulations progressively and with caution.

This paper outlines the origin of the stability Rules for Jack-ups, how they have evolved over the years. The participation by the main organizations is presented with the current activities and future changes to the Rules.

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