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Design: Moorings
Design: Moorings
Unified Facilities Criteria (UFC) - ufc_4_159_030002
Foreword - ufc_4_159_030003
New Document Summary Sheet
Figures - ufc_4_159_030008
Figures - Cont'd - ufc_4_159_030009
Figures - Cont'd - ufc_4_159_030010
Tables - ufc_4_159_030011
Tables - Cont'd - ufc_4_159_030012
Chapter 1 Introduction - ufc_4_159_030013
Figure 1-1. DOD Organizations Involved With Ship Moorings
Chapter 2 Mooring Systems
Table 2-1. Examples of Fixed Moorings
Figure 2-1. Single Ship, Offset From a Pier With Camels
Figure 2-4. Ships on Both Sides of a Pier (plan view)
Figure 2-5. Two Ships on One Side of a Pier (plan view)
Table 2-2. Examples of Fleet Moorings
Table 2-2. Examples of Fleet Moorings - Cont'd - ufc_4_159_030021
Table 2-2. Examples of Fleet Moorings - Cont'd - ufc_4_159_030022
Figure 2-6. Ship at Anchor
Figure 2-7. Single Point Mooring With Drag Anchors
Figure 2-8. Single Point Mooring With a Plate Anchor and a Sinker
Figure 2-9. Bow-Stern Mooring Shown in Plan View
Figure 2-11. Spread Mooring
Figure 2-13. Spread Mooring
Chapterb 3 Basic Design Procedure
Table 3-2. Basic Mooring Design Approach With Known Facility
Table 3-2. Basic Mooring Design Approach With Known Facility - Cont'd
Table 3-3. Design Issues
Table 3-4. Mooring Service Types
Strength
Table 3-5. Facility Design Criteria for Mooring Service Types
Table 3-6. Ship Mooring Hardware Design Criteria
Design Methods - ufc_4_159_030037
Table 3-7. Minimum Quasi-Static Factors of Safety
Table 3-8. Recommended Practical Motion Criteria for Moored Vessels
Table 3-8. Recommended Practical Motion Criteria for Moored Vessels - Cont'd - ufc_4_159_030040
Table 3-8. Recommended Practical Motion Criteria for Moored Vessels - Cont'd - ufc_4_159_030041
Table 3-8. Recommended Practical Motion Criteria for Moored Vessels - Cont'd - ufc_4_159_030042
Table 3-9. Quasi-Static Design Notes
Dynamic Mooring Analysis
Risk
Table 3-10. Conditions Requiring Special Analysis
Figure 3-1. Risk Diagram
Ship Design/Construction Coordinates
Figure 3-2. Ship Design and Hydrostatic Coordinates
Figure 3-3. Local Mooring Coordinate System for a Ship
Figure 3-4. Local Mooring Coordinate System for a Ship
Table 3-11. Design Considerations - Ship
Table 3-12. Design Considerations - Facility
Winds
Figure 3-5. Ratio of Wind Speeds for Various Gusts (after ASCE 7-95)
Figure 3-6. Typhoon OMAR Wind Chart Recording 3 October 2005
Wind Gust Fronts
Figure 3-7. Sample Wind Gust Fronts on Guam, 2-4 October 1982
Table 3-13. Sample Distribution of Wind Gust Fronts on Guam (Agana NAS) from 1982 to 1986
Figure 3-9. Initial Versus Maximum Wind Speeds for Wind Gust Fronts
Figure 3-10. Wind Gust Front Maxima on Guam 1982-1986
Table 3-14. Storm Parameters
Table 3-14. Storm Parameters - Cont'd - ufc_4_159_030063
Table 3-14. Storm Parameters - Cont'd - ufc_4_159_030064
Currents - ufc_4_159_030065
Water Depths
Table 3-15. Some Sources of Environmental Design Information
Table 3-15. Some Sources of Environmental Design Information - Cont'd
Table 3-16. Mooring Operational Design Considerations
Table 3-17. Inspection Guidelines
Table 3-17. Inspection Guidelines - Cont'd
Figure 3-11. Idealized Models of Chain Wear
Table 3-18. Design Recommendations
Table 3-18. Design Recommendations - Cont'd
Chapter4 static Environmental Forces and Moments on Vessels
Table 4-1. Engineering Properties of Air and Water
Static Wind Forces/Moments
Figure 4-1. Definition of Terms
Figure 4-2. Local Coordinate System for a Ship
Static Transverse Wind Force
Table 4-2. Sample Wind Coefficients for Ships
Figure 4-3. Sample Ship Profiles
Figure 4-4. Shape Function for Transverse Wind Force
Static Transverse Wind Force - Cont'd
Figure 4-5. Example
Figure 4-6. Blockage Effect for an Impermeable Structure Next to a Moored Ship
Static Longitudinal Wind Force
Table 4-3. Recommended Ship Longitudinal Wind Force Drag Coefficients
Case I Single Distinct Superstructure
Case II Single Distinct Superstructure
Static Wind Yaw Moment
Table 4-5. Normalized Wind Yaw Moment Variables
Figure 4-7. Sample Yaw Normalized Moment Coefficient
Static Current Forces/Moments
Figure 4-8. Examples of Ratios of Ship Draft (T) to Water Depth (d)
Figure 4-9. Broadside Current Drag Coefficient
Static Transverse Current Force
Static Transverse Current Force - Cont'd
Table 4-6. Predicted Transverse Current Forces on FFG-7 for a Current Speed of 1.5 m/s (2.9 knots)
Figure 4-10. Example of Transverse Current Drag Coefficients
Static Longitudinal Current Force for Ships
Static Longitudinal Current Force for Ships - Cont'd - ufc_4_159_030102
Static Longitudinal Current Force for Ships - Cont'd - ufc_4_159_030103
Table 4-7. AR for Major Vessel Groups
Table 4-8. Example Destroyer
Static Longitudinal Current Force for Blunt Vessels
Static Current Yaw Moment
Table 4-10. Current Moment Eccentricity Ratio Variables
Chapter 5 Anchor System DEsign Procedures
Table 5-1. Anchor Specification Considerations
Figure 5-1. Example of a Drag-Embedment Anchor (Stabilized Stockless Anchor)
Figure 5-2. Example of a Drag-Embedment Anchor (NAVMOOR Anchor)
Figure 5-3. Driven-Plate Anchor
Table 5-2. Anchor Characteristics
Table 5-2. Anchor Characteristics - Cont'd - ufc_4_159_030115
Table 5-2. Anchor Characteristics - Cont'd - ufc_4_159_030116
Drag-Embedment Anchor Specification
Table 5-3. Drag Anchor Holding Parameters U.S. Customary
Table 5-4. Drag Anchor Holding Parameters SI Units
Figure 5-4.Anchor System Holding Capacity in Cohesive Soil (Mud)
Figure 5-5 Anchor System Holding Capacity in Cohesionless Soil (Sand)
Driven-Plate Anchor Design
Table 5-5. Driven-Plate Anchor Components
Table 5-6. Major Steps in Driven-Plate Anchor Installation
Figure 5-6. Major Steps of Driven-Plate Anchor Installation
Table 5-7. Typical Driven-Plate Anchors
Chapter 6 Facility Mooring Equipment Guidelines
Table 6-1. Practical Experience With Anchors
Table 6-1. Practical Experience With Anchors - Cont'd
Table 6-2. Stockless Anchors in the U.S. Navy Fleet Mooring Inventory
Table 6-3. NAVMOOR Anchors in the U.S. Navy Fleet Mooring Inventory
Chain and Fittings
Table 6-4. FM3 Mooring Chain Characteristics
Table 6-5. Properties of FM3 Chain Anodes
Figure 6-1. Chain Fittings
Buoys
Table 6-6. Foam-Filled Polyurethane Coated Buoys
Table 6-7. Stretch of Synthetic Lines
Figure 6-2. Synthetic Line Stretch
Table 6-8. Double Braided Nylon Line*
Table 6-9. Double Braided Polyester Lines
Table 6-10. Some Factors to Consider When Specifying Synthetic Line or Wire Rope
Wire Ropes
Figure 6-3. SEA-GUARD Fender Information
Figure 6-4. SEA-CUSHON Fender Performance
Table 6-11. Commonly Used U.S. Navy Pier Mooring Fittings
Figure 6-5. Pier and Wharf Mooring Fittings Shown in Profile
Catenary Behavior
Figure 6-6. Sample Catenary
Figure 6-7. Load/Deflection Curve for the Example Mooring Leg
Table 6-12. Sources of Information for Facility Mooring Equipment
Chapter 7 Vessel Mooring Equipment Guidelines
Fixed Bitts
Table 7-1. Types of Ship Based Mooring Equipment
Figure 7-1. Ship's Fixed Double Bitts
Table 7-2. Fixed Ships' Bitts (minimum strength requirements)
Figure 7-2. Recessed Shell Bitt (minimum strength requirements)
Table 7-3. Closed Chocks (minimum strength requirements)
Table 7-4. Sources of Information for Ships' Mooring Equipment
Chapter 8 Example Problems
Figure 8-1. Some Types of Behavior of Ships at Single Point Moorings
Table 8-1. 2nd LT JOHN P BOBO Parameters (Fully Loaded)
Forces/Moments - ufc_4_159_030165
Figure 8-2. Example Single Point Mooring
Figure 8-3. Example Mooring Failure Due to a Wind Gust Front
Table 8-2. CVN-68 Criteria (Fully Loaded)
Forces/Moments - ufc_4_159_030169
Figure 8-4. Wind Forces and Moments on a Single Loaded CVN-68 for a 75-mph (33.5-m/s) Wind
Figure 8-5. Definitions
Figure 8-6. Optimum Ideal Mooring
Figure 8-7. Required Mooring Capacity Using the Optimum Ideal Mooring
Wharf Mooring Concept
Figure 8-8. Efficiency of Ship Moorings Using Synthetic Lines at Piers and Wharves
Figure 8-9. CVN-68 Wharf Mooring Concept (`Model 2')
Figure 8-10. Component Analysis of Mooring Working Capacity
Figure 8-11. Mooring Line Tensions for a CVN-68 Moored at a Wharf With 75 mph
Background for Example
Figure 8-12. Aircraft Carrier Mooring Concept (perspective view)
Table 8-3. DD 963 Criteria (1/3 Stores)
Table 8-4. Environmental Forces
Figure 8-13. Wind Forces and Moments on a Nest of Four DD 963 Class Vessels
Number of Mooring Legs
Figure 8-14. Spread Mooring Arrangement for a Nest of Four Destroyers
Table 8-5. Quasi-Static Leg Tensions for the Spread Mooring
Dynamic Analysis
Figure 8-15. End View of DD 963 Mooring Nest
Table 8-6. Peak Dynamic Chain Tensions for DD 963 Nest for Various Wind Directions
Anchor Design
Table 8-7. DD 963 Nest Motions for Surge, Sway, and Yaw at Various Wind Directions
Anchor Design - Cont'd
Figure 8-16. Plate Anchor Holding Capacity
Mooring LPD-17,LHD-1 and LHA-1
Figure 8-17. LPD-17 USS San Antonio
Table 8-8. LPD-17 Characteristics
Figure 8-18. Approximate Safe Mooring Limits for LPD-17 with 28 Parts of Mooring Line
Mooring LPD-17 - Cont'd
Figure 8-19. Sample LPD-17 Standard Mooring (Mooring Service Type IIa)
Figure 8-20. Sample LPD-17 Storm Mooring (Mooring Service Type IIb)
Figure 8-21. Sample LPD-17 Heavy Weather Mooring (Mooring Service Type III)
Figure 8-22. Sample LPD-17 Mooring at a Double-Deck Pier
Chapter 9 Passing Ship Effects on Moored Ships
Figure 9-1. Sample Passing Ship Situation
Figure 9-2. Example of Passing Ship Predictions
Chapter 10 Ship Waves
Figure 10-1. Ship Waves (after Sorenson, 1997)
Figure 10-2. Ship Hull-Forms Tested (after Sorenson, 1997)
Figure 10-3. Maximum Wave Height One Wavelength Away From the Sailing Line For a SERIES 60 Hull
Chapter 11 Heavy Weather Mooring Guidelines
Heavy Weather Mooring Guidelines
Heavy Weather Mooring Guidelines - Cont'd - ufc_4_159_030212
Figure 11-1. Example of a Standard LPD 17 Mooring
Heavy Weather Mooring Guidelines - Cont'd - ufc_4_159_030214
Figure 11-2. Securing Two Parts of Heavy Weather Mooring Line
Planning - ufc_4_159_030216
Glossary - ufc_4_159_030217
Appendix A References - ufc_4_159_030218
Goverment Publications - ufc_4_159_030219
Goverment Publications - Cont'd - ufc_4_159_030220
Goverment Publications - Cont'd - ufc_4_159_030221
Goverment Publications - Cont'd - ufc_4_159_030222
Goverment Publications - Cont'd - ufc_4_159_030223
Non-Goverment Publications - ufc_4_159_030224
Non-Goverment Publications - Cont'd - ufc_4_159_030225