Ageing and Life Extension of Offshore Facilities
Chapter 7. Life Extension of Mooring Chains - Including Effects of Mean Load and Corrosion Condition to Fatigue Capacity
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The mooring systems on floating offshore installations are typically designed for a life of 25 years. Life extension of installations beyond the original design life thus requires either mooring system replacement or assessment to document life extension of the mooring system components. Mooring chains are normally the components with the shortest design life, where the design codes define how break strength and fatigue capacity reduce with time, due to an annual expected corrosion loss.
Equinor has replaced many mooring chains, and these have been thoroughly inspected, where some have been tested to document actual break capacity and fatigue capacity. The...