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IEC TS 62600-10
Edition 2.0 2021-07
TECHNICAL
SPECIFICATION
colour
inside
Marine energy – Wave, tidal and other water current converters –
Part 10: Assessment of mooring system for marine energy converters (MECs)
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IEC TS 62600-10
Edition 2.0 2021-07
TECHNICAL
SPECIFICATION
colour
inside
Marine energy – Wave, tidal and other water current converters –
Part 10: Assessment of mooring system for marine energy converters (MECs)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.140 ISBN 978-2-8322-1001-5
– 2 – IEC TS 62600-10:2021 © IEC 2021
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references. 9
3 Terms and definitions . 9
4 Abbreviated terms . 10
5 Principal elements . 10
5.1 General . 10
5.2 Technology qualification . 10
5.3 Safety and risk consideration . 11
5.4 Safety levels . 11
5.5 Design procedure . 11
5.6 Inspection and maintenance requirements . 11
6 Environmental and site conditions . 11
6.1 General . 11
6.2 Primary environmental conditions . 12
6.3 Secondary environmental conditions . 12
6.3.1 General . 12
6.3.2 Marine growth . 12
6.3.3 Seabed conditions . 12
6.4 Site characteristics . 12
6.4.1 General . 12
6.4.2 Environmentally sensitive and protected areas and marine animals . 12
6.4.3 Nearshore impact . 12
6.4.4 Vandalism and misuse . 13
6.4.5 Marine traffic . 13
6.4.6 Shallow water conditions . 13
7 Design load cases . 13
7.1 General . 13
7.2 Analysis procedure overview . 13
7.3 Load categories . 14
7.3.1 General . 14
7.3.2 Dynamic analysis of MEC response to environmental conditions . 15
7.3.3 Low frequency loads . 15
7.3.4 Wave frequency loads on mooring components . 15
7.3.5 Wave frequency loads on MEC . 15
7.3.6 High frequency loading . 16
7.4 Interaction with waves, currents, wind, water level and ice . 16
7.4.1 General . 16
7.4.2 Resonant response . 17
7.4.3 Design return period for short term deployments . 17
7.5 Mooring line components . 17
7.5.1 General . 17
7.5.2 Component strength . 17
7.5.3 Component fatigue life . 18
7.5.4 Redundancy . 18
7.5.5 Clearance . 18
7.6 Umbilical considerations . 18
7.6.1 Umbilical response . 18
7.6.2 Umbilical strength . 18
7.6.3 Umbilical offset and clearance limits . 18
7.7 Limit states . 19
7.7.1 General . 19
7.7.2 Ultimate limit state (ULS) . 19
7.7.3 Accidental limit state (ALS) . 19
7.7.4 Serviceability limit state (SLS) . 19
7.7.5 Fatigue limit state (FLS) . 19
7.7.6 Consequence class safety factors . 20
7.7.7 Mooring component failure . 20
7.7.8 Anchor holding capacity . 20
7.7.9 Load case modelling and simulation . 21
7.7.10 Design conditions . 22
8 In-service inspection, monitoring, testing, and maintenance . 32
8.1 General . 32
8.2 Anchor proof loading . 33
8.3 Component replacement . 33
8.3.1 General . 33
8.3.2 Fibre rope component inspection and replacement . 33
8.3.3 Inspection and predictive procedures . 33
8.4 In air and splash zone mooring line sections . 34
8.5 Submerged mooring line sections . 34
8.6 Commissioning and decommissioning procedures . 35
Annex A (informative) Moorings and anchoring systems . 36
A.1 Types of moorings and anchoring systems . 36
A.1.1 General . 36
A.1.2 Mooring systems . 36
A.2 Mooring line components . 38
A.2.1 General . 38
A.2.2 Chain . 38
A.2.3 Wire rope . 39
A.2.4 Synthetic rope . 39
A.2.5 Elastic tethers . 46
A.2.6 Clump weights . 47
A.2.7 Buoyancy aids . 47
A.2.8 Connectors and accessories . 47
A.3 Anchors . 48
A.3.1 General . 48
A.3.2 Drag embedment anchor . 48
A.3.3 Pile anchor . 49
A.3.4 Suction anchor . 49
A.3.5 Gravity installed anchor . 50
A.3.6 Gravity anchor . 51
A.3.7 Plate anchor . 52
A.3.8 Screw and rock anchors . 52
– 4 – IEC TS 62600-10:2021 © IEC 2021
A.3.9 Type selection . 53
A.3.10 Holding capacity . 53
A.3.11 Sediment and rock conditions .
...