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Guide for Position Mooring Systems May 2020

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Guide for Position Mooring Systems May 2020 GUIDE FOR POSITION MOORING SYSTEMS MAY 2020 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 © 2020 American Bureau of Shipping. All rights reserved. 1701 City Plaza Drive Spring, TX 77389 USA Foreword Mooring systems have been evolving in design, analysis, operating management and other areas to meet the challenges of safety and efficiency. ABS Rules and Guides are developed and updated to keep pace with the industry. This has resulted in a complex library of Rules and Guides. Many requirements are repeated throughout ABS Rules and Guides making use and maintenance of Rules/Guides more challenging. To address the duplication of requirements and provide a set of Rules/Guides that is easier to navigate, this Guide consolidates the latest classification requirements for position mooring systems. In addition to the consolidation of the current requirements, this Guide also includes updates in the following areas based on the latest industry knowledge and experiences: ● Vortex Induced Motion (VIM) effect (8/3.7, 8/5.13) ● Bending-tension fatigue of mooring chains (3/7.5) ● Fiber rope mooring criteria (3/7.3) ● Mooring systems in squalls (3/3.5, 8/3.1, 8/5.11) ● Dynamically installed anchors (3/7.9, 6/5.7) ● Anchor holding capacity (6/5.7) ● Mooring analysis methodology (Section 8) ● Thruster-Assisted Mooring (Section 4) This Guide supplements the following ABS Rules and Guides for issuing classification Notations relevant to position mooring systems: ● ABS Rules for Building and Classing Floating Production Installations (FPI Rules) ● ABS Rules for Building and Classing Mobile Offshore Units (MOU Rules) ● ABS Rules for Building and Classing Single Point Moorings (SPM Rules) ● ABS Guide for Building and Classing Floating Offshore Liquefied Gas Terminals (FLGT Guide) ● ABS Rules for Building and Classing Marine Vessels (MVR Rules) ● ABS Guide for the Classification Notation Thruster-Assisted Mooring (TAM, TAM-R, TAM (Manual)) For Mobile Mooring Systems (TAM Guide) ● ABS Guide for the Classification Symbols Pre-Laid Position Mooring Systems and Equipment for Mobile Offshore Units (Pre-Laid Guide) The following figure shows the relationship between this Guide and other ABS Rules/Guides/Guidance Notes: This Guide focuses on design aspect of position mooring systems. Survey requirements remain in relevant Rules/Guides and are referenced in this Guide. The design requirements for position mooring systems will be removed from above mentioned Rules/Guides and replaced with references to this Guide on 1 July, 2019. Before 1 July 2019, designers can choose to use this Guide or applicable Rules/Guides mentioned above. On 1 July 2019, TAM Guide and Pre-Laid Guide will be withdrawn and only this Guide will remain for the design of position mooring system. ABS GUIDE FOR POSITION MOORING SYSTEMS • 2020 ii Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of this Guide is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to [email protected]. ABS GUIDE FOR POSITION MOORING SYSTEMS • 2020 iii GUIDE FOR POSITION MOORING SYSTEMS CONTENTS SECTION 1 Introduction........................................................................................ 10 1 Objectives.....................................................................................10 3 Scope and Application..................................................................10 5 ABS Rules and Guides References..............................................11 7 References of Industry Standards and Guidelines....................... 11 9 Terms and Definitions of Mooring Systems.................................. 12 11 Abbreviations................................................................................15 SECTION 2 Classification of Mooring Systems.................................................. 17 1 General.........................................................................................17 3 Classification Notation.................................................................. 17 3.1 Mooring System for Floating Production Installations......17 3.3 Mooring System for Floating Offshore Liquefied Gas Terminals......................................................................... 17 3.5 Mooring System for Mobile Offshore Drilling Units, for Mobile Offshore Units, for Offshore Supply Vessels...17 3.7 Mooring System for Mooring Terminals........................... 18 5 Documentation..............................................................................18 SECTION 3 Mooring System Design.................................................................... 20 1 General.........................................................................................20 3 Environmental Criteria.................................................................. 20 3.1 General............................................................................ 20 3.3 Design Environmental Conditions....................................20 3.5 Environmental Data......................................................... 22 3.7 Mooring Location............................................................. 26 5 Mooring System Design Requirements........................................ 28 5.1 Design Requirement........................................................ 28 5.3 Design Analysis............................................................... 28 5.5 Loading and Mooring System Conditions........................ 29 5.7 Summary of Mooring Analysis Conditions....................... 30 7 Mooring System Design Criteria...................................................31 7.1 Offset of Moored Floating Structures/units...................... 31 7.3 Mooring Line Tension.......................................................32 7.5 Mooring Line Fatigue....................................................... 33 ABS GUIDE FOR POSITION MOORING SYSTEMS • 2020 iv 7.7 Mooring Line Design Factor of Safety............................. 35 7.9 Mooring Anchor............................................................... 36 7.11 Mooring between Vessel and Installation/ Mooring Terminal........................................................................... 38 7.13 Allowance for Corrosion and Wear.................................. 39 7.15 Clearance........................................................................ 39 9 Mooring Line Monitoring............................................................... 40 9.1 Mooring Line Failure Detection........................................40 9.3 Mooring Line Tension Monitoring for MODUs..................40 9.5 Heading Monitoring of Moored Units............................... 40 TABLE 1 Mooring Analysis Conditions................................................30 TABLE 2 and Value......................................................................33 TABLE 3 Strength Factor of Safety for Mooring Lines........................ 36 M K TABLE 4 Fatigue Factor of Safety for Mooring Lines..........................36 TABLE 5 Factor of Safety for Anchor Holding Capacity......................37 TABLE 6 Chain Corrosion and Wear Allowance................................. 39 FIGURE 1 Direction of Wave Wind and Current Illustration.................. 25 SECTION 4 Thruster-Assisted Mooring............................................................... 41 1 Introduction...................................................................................41 1.1 General............................................................................ 41 1.3 Application....................................................................... 41 3 Technical Requirements............................................................... 41 3.1 Thruster-Assisted Mooring Design Criteria......................41 5 System Requirements.................................................................. 43 5.1 Mooring System...............................................................43 5.3 Thruster Systems.............................................................43 5.5 Power Systems................................................................44 5.7 Control and Monitoring System....................................... 44 5.9 Communications for Units with Thrust Assist Mooring System.............................................................................45 7 Failure Mode and Effect Analysis................................................. 45 9 Available Thrust............................................................................ 46 9.1 Available Thrust for Thrusters..........................................46 9.3 Thruster-Thruster Interaction........................................... 46 9.5 Thruster-Hull Interaction.................................................. 46 9.7 Thruster-Current Interaction............................................ 47 11 Thruster Assisted Mooring Analysis Methodology........................47 11.1 Mean Load Reduction......................................................47 11.3 Time Domain Analysis Approach.....................................47 ABS GUIDE FOR POSITION MOORING SYSTEMS • 2020 v TABLE 1 Intact and Damaged TAM Definitions...................................41 TABLE 2 Allowable Thrust for Thruster Assisted Mooring System..... 42 TABLE 3 Mooring Line Factor of Safety..............................................43 FIGURE 1 Automatic Thruster Control Feedback Loop........................ 48 SECTION 5 Pre-laid Stationkeeping
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