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BSI PD IEC TS 62600-10:2021

BSI PD IEC TS 62600-10:2021

$183.59

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 2021 70
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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
2 undefined
4 CONTENTS
8 FOREWORD
10 INTRODUCTION
11 1 Scope
2 Normative references
3 Terms and definitions
12 4 Abbreviated terms
5 Principal elements
5.1 General
5.2 Technology qualification
13 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
14 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
15 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
16 7.3 Load categories
7.3.1 General
Figure 1 – Recommended conceptual mooring analysis procedure
17 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
18 7.3.6 High frequency loading
7.4 Interaction with waves, currents, wind, water level and ice
7.4.1 General
19 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
20 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
21 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)
22 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
23 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
24 7.7.10 Design conditions
26 Table 7 – Design load cases for WECs
28 Table 8 – Design load cases for CECs
34 8 In-service inspection, monitoring, testing, and maintenance
8.1 General
35 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
36 8.4 In air and splash zone mooring line sections
8.5 Submerged mooring line sections
37 8.6 Commissioning and decommissioning procedures
38 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
39 Figure A.2 – Catenary anchor leg mooring configuration
Figure A.3 – Single anchor leg mooring configuration
40 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
41 A.2.3 Wire rope
A.2.4 Synthetic rope
Figure A.6 – Typical wire rope construction
42 Table A.1 – Generalized comparison of mooring line material characteristics
43 Figure A.7 – Parallel yarn rope
Figure A.8 – Parallel core rope
44 Figure A.9 – Rope construction with 18+12+6+1 format
Figure A.10 – Three strand laid construction
45 Figure A.11 – Rope with 8 plait braid construction
Figure A.12 – Rope with braid on braid construction
46 Table A.2 – Properties for selection of synthetic fibre
Table A.3 – Generalized comparison of common rope relevant material properties
48 A.2.5 Elastic tethers
49 A.2.6 Clump weights
A.2.7 Buoyancy aids
A.2.8 Connectors and accessories
50 A.3 Anchors
A.3.1 General
A.3.2 Drag embedment anchor
Figure A.13 – Types of connectors
51 A.3.3 Pile anchor
A.3.4 Suction anchor
Figure A.14 – Drag embedment anchor
Figure A.15 – Pile anchor
52 A.3.5 Gravity installed anchor
Figure A.16 – Suction anchor
53 A.3.6 Gravity anchor
Figure A.17 – Gravity installed torpedo anchor
Figure A.18 – Gravity installed anchor with rotating load arm
54 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
55 A.3.9 Type selection
A.3.10 Holding capacity
Figure A.21 – Screw anchor
Figure A.22 – Rock anchor
56 A.3.11 Sediment and rock conditions
A.3.12 Fluke setting
A.3.13 Installation
57 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
58 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
59 B.3 Risk assessment methodology
B.3.1 General
B.3.2 Methodology flowchart
60 Figure B.1 – General risk methodology flowchart
61 B.4 Consequence considerations for mooring failure
B.5 Consequence classification
B.5.1 General
Table B.1 – Consequence categories
62 B.5.2 Consequence impact considerations
63 B.5.3 Risk mitigation considerations
B.5.4 Risk acceptance
65 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
67 Bibliography

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BSI PD IEC TS 62600-10:2021
$183.59