The purpose of this paper is to provide design criteria for seafloor observatory moorings where the principle mooring line element is an electro-mechanical (EM) cable, and the primary cause for failure is the bending fatigue at terminations. A single point mooring system that consists of a discus surface buoy, an S-tether, a subsurface buoy, and an anchor is considered for this analysis. The waves are assumed random and modeled using the Pierson-Moskowitz spectrum. Raoof’s contact stress-slip parameter at the connection between the surface buoy and the EM cable is used to evaluate a particular design and to provide general guidelines to arrive at optimal design.

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