1 SCOPE
2 BASIC CONSIDERATIONS
2.1 Background
2.2 Mooring Issues
2.3 Site-and Well-Specific Data
2.4 Stacked MODUs
2.5 Exceptional MODU Mooring Operations
2.6 Mooring Inspection
3 MOORING ANALYSIS
3.1 Mooring Analysis Method
3.2 Idealized mooring system behavior: robustness check or
weak point analysis
4 MOORING DESIGN CRITERIA
4.1 Existing design criteria
4.2 Recommended Modifications for Gulf of Mexico MODU Moorings
5 CONSEQUENCES OF MODU MOORING FAILURE AND RETURN PERIOD
(RISK ASSESSMENT)
5.1 Risk
5.2 Simplified Consequence assessment
5.3 Risk assessment
5.4 Atypical modu operations
5.5 Site Specific and Mooring System Information
5.6 Metocean Criteria
6 MOORING SYSTEM IMPROVEMENT
6.1 Higher Strength Components and Additional Lines
6.2 Fiber Rope Insert
6.3 Fiber Rope and Steel Wire Rope Interaction - Strength and
Fatigue Considerations
7 ANCHOR SYSTEM CONSIDERATIONS
7.1 Drag anchor
7.2 Plate anchor
7.3 Suction Pile
7.4 Anchor Holding Capacity and Safety Factors
8 HURRICANE PREPAREDNESS
8.1 Preparedness Overview
8.2 Loop and Eddy Currents
8.3 MODU Trackers
8.4 Post-storm Reporting
9 MOORING INSTALLATION
9.1 Mooring Installation Plan
9.2 As-Installed Mooring System Information
9.3 Post-installation Verification
10 INDICATIVE GULF OF MEXICO HURRICANE EXTREME ENVIRONMENTS
10.1 Applicability
10.2 Tabular Metocean Parameters vs. Return Period
11 REFERENCES
APPENDIX I - CONSEQUENCE ASSESSMENT CHECKLIST
APPENDIX II - Storm Reporting Sheet for Semisubmersible Rig Status
Report
APPENDIX III - MODU Mooring Inspection for Areas of Tropical
Cyclone
Figures
Tables