New normative guidelines for mooring design Robustness Check have been added. Industry standards that allow safe and economic operations are important to the industry, community and regulatory authorities. This knowledge has resulted in changes to the industry standards. Publishers Content Coverage Privacy. Improvements the MODU owners have made to the fleet will also be discussed along with options that can help mitigate the risk of a MODU failing and doing damage to infrastructure during a hurricane.
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Industry standards that allow safe and economic operations are important to the industry, community and regulatory authorities. Much work has been done since the events of the and hurricane seasons to better understand the causes of moored MODU failures and learn from them. This knowledge has resulted in changes to the industry standards.
RP 2SK requires a mobile mooring, like that on a MODU, be designed to a 5-year return period event when operating away from other structures. When operating in the vicinity of other structures, a year return period event is required.
RP 2SK also permits using a risk analysis to determine the design return period, but in no case shall it be less than one year. Three strong hurricanes Ivan, Katrina and Rita entering the Gulf of Mexico within roughly a month period and carving paths through areas of the Gulf of Mexico with extensive oilfield infrastructure was unprecedented.
However, over time, the number of MODUs working in the deep water has increased, along with more infrastructure, thus increasing the probability of failure and possible consequences of failure damage. New criteria, which are risk based, are needed to better protect critical infrastructure during GoM hurricanes unless a more prescriptive type of code can be developed. The minimum design return period was increased to a year return period event, whether far from or in the vicinity of infrastructure.
Also, in no case is the one-minute wind speed to be less than 64 knots a threshold category 1 hurricane. For the hurricane season, a 2nd Edition of 95F was released that was an improvement over the 1st Edition but still did not provide all the guidance needed by the industry. The 2nd Edition included guidance on post-storm inspection and recertification of mooring components to ensure the integrity of components from a damaged mooring system. RP 2I also dictates that mooring components should go through a more thorough and fully documented quality and inspection process.
A risk-based approach has been developed and incorporated into a new Appendix K of RP 2SK to replace 95F for the hurricane season and beyond. Proper implementation of the appendix will aid in the planning of drilling operations and the designs of MODU mooring systems, which should reduce the consequences to the MODU fleet and offshore infrastructure if the hurricane seasons repeat.
In parallel with the efforts of the 2SK Task Group, a joint industry project was launched to explicitly study and learn from the successes and failures of moored MODUs during the hurricane seasons. Explicit studies that were conducted and how they benefited the 2SK Task Group will be discussed and how they impacted the 2SK Commentary. This includes development of a consequence-based assessment spreadsheet tool, a mooring reliability study, fleet mooring capability for the original and upgraded mooring systems and comparative risk assessment.
Industry response to the impact of the hurricanes and the evolving practices shows the commitment by all to address and correct this issue.
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API RP 2SK PDF
API RP 2SK