Case Study - Integrity Management of Offshore Buoy Moorings

The Challenge

The long term integrity management of offshore buoy moorings chain connectors is mandatory, especially for preventing any risk of fatigue corrosion cracks.

The chain connector is basically a few meters long hawse pipe fully immersed in seawater with the ratchet on buoy side and the guide ring on the other side.

A few links of chain located inside this pipe must be efficiently cathodically protected from sacrificial anodes which can only be located on the external part of the hawse.

The Solution

A 3D BEASY simulation was used to predict the protection provided by the different design options and to determine the optimum solution.

The Value

The long term integrity management of the offshore buoy moorings chain connectors has been assured by determining which design option provides the protection necessary.

The computer model provides a methodology for testing the effectiveness of the design options and provides quantitative information on the protection levels and the anode life.

Reference: Cathodic Protection Modeling of Buoy Chain Connector by 3D Software Simulation: Influence of Holes Size and Coating, Marcel Roche and Jean Vittonato,TOTAL S.A.. NACE Corrosion Conference, New Orleans, 2008

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