IEC TS 62600-10:2015

IEC TS 62600-10 ®
Edition 1.0 2015-03
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 1.0 2015-03
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 978-2-8322-2431-1

– 2 – IEC TS 62600-10:2015 © IEC 2015
CONTENTS
FOREWORD. 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 9
4 Abbreviated terms . 11
5 Principal element . 12
5.1 General . 12
5.2 Mooring and anchor systems . 12
5.3 Design considerations . 12
5.4 Safety and risk consideration . 13
5.5 Analysis procedure . 13
5.6 Inspection and maintenance requirements . 13
6 Types of moorings and anchoring systems . 13
6.1 General . 13
6.2 Mooring systems . 13
6.2.1 General . 13
6.2.2 Spread moorings (catenary, taut-line and semi-taut-line) . 13
6.2.3 Single point moorings (SPM) . 14
6.3 Mooring line components . 15
6.3.1 General . 15
6.3.2 Chain . 15
6.3.3 Wire rope . 16
6.3.4 Synthetic rope . 17
6.3.5 Clump weights . 17
6.3.6 Buoyancy aids . 17
6.3.7 Connectors and accessories . 17
6.4 Anchors types . 18
6.4.1 General . 18
6.4.2 Drag embedment anchor . 18
6.4.3 Pile anchor . 19
6.4.4 Suction anchor . 19
6.4.5 Gravity installed anchor . 20
6.4.6 Gravity anchor . 20
6.4.7 Plate anchor . 21
6.4.8 Screw anchor . 21
7 Design consideration . 22
7.1 General . 22
7.2 Limit states . 22
7.2.1 Ultimate limit state (ULS) . 22
7.2.2 Accidental limit state (ALS) . 22
7.2.3 Serviceability limit state (SLS) . 22
7.2.4 Fatigue limit state (FLS) . 22
7.3 External conditions . 23
7.3.1 General . 23
7.3.2 Metocean conditions . 23

7.3.3 Marine growth . 23
7.3.4 Marine life . 23
7.3.5 Environmentally sensitive and protected areas and marine animals . 23
7.3.6 Nearshore impact . 23
7.3.7 Vandalism and misuse . 23
7.3.8 Marine traffic . 24
7.4 Assorted loading . 24
7.4.1 General . 24
7.4.2 Low frequency loads . 24
7.4.3 Wave frequency loads on mooring components . 24
7.4.4 Wave frequency loads on MEC . 25
7.4.5 High frequency loading . 25
7.5 Mooring line components . 25
7.5.1 Component strength . 25
7.5.2 Component fatigue life . 25
7.5.3 Redundancy . 25
7.5.4 Clearance . 25
7.6 Umbilical considerations . 26
7.6.1 Umbilical response . 26
7.6.2 Umbilical strength . 26
7.6.3 Umbilical offset and clearance limits . 26
7.7 Anchors . 26
7.7.1 Type selection . 26
7.7.2 Holding capacity . 26
7.7.3 Sediment and rock conditions . 26
7.7.4 Fluke setting . 27
7.7.5 Installation . 27
7.7.6 Proof loading . 27
7.7.7 Directional anchor loading . 27
7.7.8 Failure mode . 27
7.7.9 Environmental loading . 27
8 Safety and risk considerations . 27
8.1 Overview . 27
8.2 Risk . 27
8.2.1 General . 27
8.2.2 Definition . 28
8.2.3 Consequence types . 28
8.2.4 General risk mitigation . 28
8.2.5 ALARP principle . 28
8.3 Risk assessment methodology . 28
8.3.1 General . 28
8.3.2 Methodology flowchart . 29
8.3.3 Basic considerations . 30
8.3.4 Probability assessment . 31
8.3.5 Consequence classification assessment . 31
8.4 Consequence considerations for mooring failure . 31
8.5 Consequence classification . 31
8.5.1 General .
...