IEC TS 62600-10:2021

Marine energy - Wave, tidal and other water current converters - Part 10: Assessment of mooring system for marine energy converters (MECs)

IEC TS 62600-10:2021 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. This document defines rules and assessment procedures for the design, installation and maintenance of mooring system with respect to technical requirements for floating marine energy converters.
This second edition cancels and replaces the first edition published in 2015. This edition includes the following significant technical changes with respect to the previous edition:
a. Added specific Design Load Cases in alignment with 62600-2.
b. Added additional robustness check requirements.
c. Rearranged document for ease of use and alignment with 62600-2.
d. Added additional informative clauses on mooring materials.

General Information

• Status: Published
• Publication Date: 21-Jul-2021
• ICS: 27.140 - Hydraulic energy engineering
• Technical Committee: TC 114 - Marine energy - Wave, tidal and other water current converters
• Drafting Committee: MT 62600-10 - TC 114/MT 62600-10
• Current Stage: PPUB - Publication issued
• Start Date: 16-Aug-2021
• Completion Date: 22-Jul-2021

Relations

• Revises: IEC TS 62600-10:2015 - Marine energy - Wave, tidal and other water current converters - Part 10: Assessment of mooring system for marine energy converters (MECs)
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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 .
...