Self-elevating drilling platform is one of the types of offshore drilling units. In this paper, we describe briefly the problems regarding motion and shipping water on deck of platforms in waves. The causes of capsizing of a damaged platform are investigated by experiment, in which the ocean environments are simulated in the towing tank, and various influences of wave height, motions of the platform, damaged tank and shipping water on capsizing have been analysed.

The suggestion and conclusions on the seakeeping and the capsizing of platforms presented in the paper can be used in the design of platforms and operations under tow.

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