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BSI PD IEC TS 62600-10:2021 – TC:2024 Edition

BSI PD IEC TS 62600-10:2021 – TC:2024 Edition

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Tracked Changes. Marine energy. Wave, tidal and other water current converters – Assessment of mooring system for marine energy converters (MECs)

Published By Publication Date Number of Pages
BSI 2024 176
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The purpose of this document is to provide uniform methodologies for the design and assessment of mooring systems for floating Marine Energy Converters (MECs) (as defined in the TC 114 scope). It is intended to be applied at various stages, from mooring system assessment to design, installation and maintenance of floating Marine Energy Converters plants.

This document is applicable to mooring systems for floating Marine Energy Converters units of any size or type in any open water conditions. Some aspects of the mooring system design process are more detailed in existing and well?established mooring standards. The intent of this document is to highlight the different requirements of Marine Energy Converters and not duplicate existing standards or processes.

While requirements for anchor holding capacity are indicated, detailed geotechnical analysis and design of anchors are beyond the scope of this document.

PDF Catalog

PDF Pages PDF Title
1 30485010
107 A-30405948
108 undefined
110 CONTENTS
114 FOREWORD
116 INTRODUCTION
117 1 Scope
2 Normative references
3 Terms and definitions
118 4 Abbreviated terms
5 Principal elements
5.1 General
5.2 Technology qualification
119 5.3 Safety and risk consideration
5.4 Safety levels
5.5 Design procedure
5.6 Inspection and maintenance requirements
6 Environmental and site conditions
6.1 General
120 6.2 Primary environmental conditions
6.3 Secondary environmental conditions
6.3.1 General
6.3.2 Marine growth
6.3.3 Seabed conditions
6.4 Site characteristics
6.4.1 General
6.4.2 Environmentally sensitive and protected areas and marine animals
6.4.3 Nearshore impact
121 6.4.4 Vandalism and misuse
6.4.5 Marine traffic
6.4.6 Shallow water conditions
7 Design load cases
7.1 General
7.2 Analysis procedure overview
Tables
Table 1 – Potential nearshore impacts
122 7.3 Load categories
7.3.1 General
Figure 1 – Recommended conceptual mooring analysis procedure
123 7.3.2 Dynamic analysis of MEC response to environmental conditions
7.3.3 Low frequency loads
7.3.4 Wave frequency loads on mooring components
7.3.5 Wave frequency loads on MEC
Figures
124 7.3.6 High frequency loading
7.4 Interaction with waves, currents, wind, water level and ice
7.4.1 General
125 7.4.2 Resonant response
7.4.3 Design return period for short term deployments
7.5 Mooring line components
7.5.1 General
7.5.2 Component strength
Table 2 – Combinations of uncorrelated extreme events
126 7.5.3 Component fatigue life
7.5.4 Redundancy
7.5.5 Clearance
7.6 Umbilical considerations
7.6.1 Umbilical response
7.6.2 Umbilical strength
7.6.3 Umbilical offset and clearance limits
127 7.7 Limit states
7.7.1 General
7.7.2 Ultimate limit state (ULS)
7.7.3 Accidental limit state (ALS)
7.7.4 Serviceability limit state (SLS)
7.7.5 Fatigue limit state (FLS)
128 7.7.6 Consequence class safety factors
7.7.7 Mooring component failure
7.7.8 Anchor holding capacity
Table 3 – Consequence class associated safety factors for dynamic analysis techniques
129 7.7.9 Load case modelling and simulation
Table 4 – Safety factors for holding capacity of drag anchors
Table 5 – Safety factors for holding capacity of anchor piles and suction piles
Table 6 – Safety factors for holding capacity of gravity and plate anchors
130 7.7.10 Design conditions
132 Table 7 – Design load cases for WECs
134 Table 8 – Design load cases for CECs
140 8 In-service inspection, monitoring, testing, and maintenance
8.1 General
141 8.2 Anchor proof loading
8.3 Component replacement
8.3.1 General
8.3.2 Fibre rope component inspection and replacement
8.3.3 Inspection and predictive procedures
142 8.4 In air and splash zone mooring line sections
8.5 Submerged mooring line sections
143 8.6 Commissioning and decommissioning procedures
144 Annex A (informative) Moorings and anchoring systems
A.1 Types of moorings and anchoring systems
A.1.1 General
A.1.2 Mooring systems
Figure A.1 – Spread mooring configuration
145 Figure A.2 – Catenary anchor leg mooring configuration
Figure A.3 – Single anchor leg mooring configuration
146 A.2 Mooring line components
A.2.1 General
A.2.2 Chain
Figure A.4 – Turret mooring configuration
Figure A.5 – Studless and studlink chain
147 A.2.3 Wire rope
A.2.4 Synthetic rope
Figure A.6 – Typical wire rope construction
148 Table A.1 – Generalized comparison of mooring line material characteristics
149 Figure A.7 – Parallel yarn rope
Figure A.8 – Parallel core rope
150 Figure A.9 – Rope construction with 18+12+6+1 format
Figure A.10 – Three strand laid construction
151 Figure A.11 – Rope with 8 plait braid construction
Figure A.12 – Rope with braid on braid construction
152 Table A.2 – Properties for selection of synthetic fibre
Table A.3 – Generalized comparison of common rope relevant material properties
154 A.2.5 Elastic tethers
155 A.2.6 Clump weights
A.2.7 Buoyancy aids
A.2.8 Connectors and accessories
156 A.3 Anchors
A.3.1 General
A.3.2 Drag embedment anchor
Figure A.13 – Types of connectors
157 A.3.3 Pile anchor
A.3.4 Suction anchor
Figure A.14 – Drag embedment anchor
Figure A.15 – Pile anchor
158 A.3.5 Gravity installed anchor
Figure A.16 – Suction anchor
159 A.3.6 Gravity anchor
Figure A.17 – Gravity installed torpedo anchor
Figure A.18 – Gravity installed anchor with rotating load arm
160 A.3.7 Plate anchor
A.3.8 Screw and rock anchors
Figure A.19 – Gravity anchor
Figure A.20 – Suction or pile driven plate anchor
161 A.3.9 Type selection
A.3.10 Holding capacity
Figure A.21 – Screw anchor
Figure A.22 – Rock anchor
162 A.3.11 Sediment and rock conditions
A.3.12 Fluke setting
A.3.13 Installation
163 A.3.14 Proof loading
A.3.15 Directional anchor loading
A.3.16 Failure mode
A.3.17 Environmental loading
A.3.18 Failure point
164 Annex B (normative) Safety and risk considerations
B.1 General
B.2 Risk
B.2.1 General
B.2.2 Definition
B.2.3 Consequence types
165 B.3 Risk assessment methodology
B.3.1 General
B.3.2 Methodology flowchart
166 Figure B.1 – General risk methodology flowchart
167 B.4 Consequence considerations for mooring failure
B.5 Consequence classification
B.5.1 General
Table B.1 – Consequence categories
168 B.5.2 Consequence impact considerations
169 B.5.3 Risk mitigation considerations
B.5.4 Risk acceptance
171 Annex C (informative) Numerical modelling considerations
C.1 General
C.2 Mooring, umbilical, and dynamic cable models
C.2.1 General
C.2.2 Static and catenary models
C.2.3 Discrete models
C.2.4 Floating unit numerical models
173 Bibliography

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