Case Study
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FSU Dynamic Mooring Analysis
Longitude provided a wide-range of marine operations engineering support, including:
- Dynamic Mooring Analysis
- Time-Critical Engineering Assessment
- Environmental Local Evaluation
- Regulatory Compliance Verification
- Operational Safety Assurance
About the project
Longitude provided a mooring analysis for an EPCM contractor for their floating exporting terminal (FSU) in Europe. The FSU was converted from an LNG tanker and is used as an additional LNG storage as well as a means of exporting LNG from an onshore terminal to various-sized shuttle tankers.
Our scope of work
Longitude provided a range of services to deliver on the following scope of work:
- Dynamic mooring analysis for permanent mooring at site
- Specification of mooring equipment
- Preparation of terminal mooring procedures
The results
The FSU is to be permanently moored alongside the gangway for 30 years, hence a 100-year-return weather condition was used to assess the mooring of the FSU, and a 1-year-return weather condition was used to assess the side-by-side mooring of the FSU and a shuttle-tanker.
The analysis was undertaken at a time that quayside mooring equipment had been ordered and was in the process of being installed. As such, time was critical to demonstrate the adequacy of that equipment. Longitude’s engineers prepared a fully dynamic analysis of the FSU and the LNGC vessel to account for various combinations of wind, wave and current whilst also taking account of the presence of the gangway.
The results demonstrated that the mooring system meets both OCIMF requirements and BV regulations, and the FSU’s excursions are within the limits of the loading arm.