IEC TS 62600-2:2016

Marine energy - Wave, tidal and other water current converters - Part 2: Design requirements for marine energy systems

IEC TS 62600-2:2016(E) provides the essential design requirements to ensure the engineering integrity of wave, tidal and other water current energy converters, referred to as marine energy converters (MECs), for a specified design life. Provides an appropriate level of protection against damage from all hazards that may lead to failure of the primary structure, defined as the collective system comprising the structural elements, foundation, mooring and anchors, piles, and device buoyancy designed to resist global loads. Includes requirements for subsystems of MECs such as control and protection mechanisms, internal electrical systems, mechanical systems and mooring systems as they pertain to the structural viability of the device under site-specific external environmental conditions. This document applies to wave, tidal and other water current converters and to structures that are either floating or fixed to the seafloor or shore. This document applies to structures that are unmanned during operational periods. This document addresses site-specific conditions, safety factors for critical structures and structural interfaces, external load cases, failure probability and failure consequences for critical structures and structural interfaces, and failsafe design practices.

General Information

• Status: Published
• Publication Date: 09-Aug-2016
• ICS: 27.140 - Hydraulic energy engineering
• ICS: 29.220.30 - Alkaline secondary cells and batteries
• Technical Committee: TC 114 - Marine energy - Wave, tidal and other water current converters
• Current Stage: DELPUB - Deleted Publication
• Start Date: 12-Jan-2018
• Completion Date: 18-Oct-2019

Relations

• Revised: IEC TS 62600-2:2019 - Marine energy - Wave, tidal and other water current converters - Part 2: Marine energy systems - Design requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC TS 62600-2


®


Edition 1.0 2016-08



TECHNICAL



SPECIFICATION




colour
inside


Marine energy – Wave, tidal and other water current converters –
Part 2: Design requirements for marine energy systems


IEC TS 62600-2:2016-08(en)

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IEC TS 62600-2



®



Edition 1.0 2016-08







TECHNICAL





SPECIFICATION












colour

inside










Marine energy – Wave, tidal and other water current converters –

Part 2: Design requirements for marine energy systems




























INTERNATIONAL

ELECTROTECHNICAL


COMMISSION





ICS 27.140 ISBN 978-2-8322-3580-5



  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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– 2 – IEC TS 62600-2:2016 © IEC 2016


CONTENTS



FOREWORD . 8

INTRODUCTION . 10

1 Scope . 11


1.1 General . 11

1.2 Applications . 11

2 Normative references. 12

3 Terms and definitions . 13

4 Symbols and abbreviated terms . 13
5 General considerations . 15
5.1 General . 15
5.2 Regulations . 15
5.3 Suitability and/or relevance of standards . 15
5.4 Quality assurance and quality control . 15
5.5 Safety levels . 16
5.6 Design principles – structure and foundations . 17
5.7 Load definition and load combinations . 17
5.8 Other considerations . 18
5.8.1 Stability and watertight integrity . 18
5.8.2 Electrical, mechanical, instrumentation and control systems . 18
5.8.3 Reliability issues . 18
5.8.4 Corrosion protection . 18
5.8.5 Design for operation, inspection, maintenance and decommissioning . 18
5.9 Operational and structural resonance . 18
5.10 Basis of design . 19
6 External conditions . 19
6.1 General . 19
6.2 Waves . 19
6.2.1 Normal sea state (NSS). 19
6.2.2 Normal wave height (NWH) . 19
6.2.3 Extreme sea state (ESS) . 20
6.2.4 Extreme wave height (EWH) . 20
6.2.5 Breaking waves . 21

6.2.6 Wave run-up . 21
6.3 Sea currents . 21
6.3.1 General . 21
6.3.2 Sub-surface currents . 21
6.3.3 Wind-generated near-surface currents . 22
6.3.4 Tidal currents . 22
6.3.5 Breaking wave-induced surf currents . 22
6.3.6 Normal current model (NCM) . 23
6.3.7 Extreme current model (ECM) . 23
6.3.8 Normal turbulence model (NTM) . 23
6.3.9 Extreme turbulence model (ETM) . 23
6.4 Wind conditions . 24
6.5 Water level. 24
6.5.1 General . 24

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6.5.2 Normal water level range (NWLR) . 25

6.5.3 Extreme water level range (EWLR) . 25

6.6 Sea and river ice . 25

6.7 Earthquakes . 26

6.8 Marine growth . 26

6.9 Seabed movement and scour . 26

6.10 Ship collisions . 26

6.11 Other environmental conditions . 26

7 Loads and load effects . 26


7.1 General . 26
7.2 Loads . 26
7.3 Design situations and load cases . 28
7.3.1 General . 28
7.3.2 Interaction with waves, currents, wind, water level and ice . 28
7.3.3 Design categories . 29
7.3.4 Limit states . 29
7.3.5 Partial safety factors . 30
7.3.6 Simulation requirements . 31
7.3.7 Design conditions . 32
8 Materials . 40
8.1 General . 40
8.2 Material selection criteria . 41
8.3 Environmental considerations . 42
8.4 Structural materials . 42
8.4.1 General . 42
8.4.2 Metals . 42
8.4.3 Concrete . 43
8.4.4 Composites . 43
8.5 Compatibility of materials . 45
9 Design of primary structures for wave and tidal/current energy converters . 45
9.1 General . 45
9.2 Design of steel structures . 45
9.2.1 General . 45
9.2.2 Load and resistance factor design (LRFD) . 46
9.2.3 Ultimate limit state . 46

9.2.4 Fatigue limit state . 47
9.2.5 Serviceability limit state . 47
9.3 Design of concrete structures . 47
9.3.1 General . 47
9.3.2 Limit states . 47
9.3.3 Bending moment and axial force . 48
9.3.4 Slender structural members . 48
9.3.5 Transverse shear . 48
9.3.6 Torsional moments . 48
9.3.7 Bond strength and anchorage failure . 48
9.3.8 Fatigue limit state . 48
9.3.9 Serviceability limit state . 49
9.3.10 Stresses in pre-stressed reinforcement . 49
9.3.11 Stresses in concrete . 49

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9.3.12 Detailing of reinforcement . 49

9.3.13 Corrosion control . 49

9.4 Design of grouted connections . 49

9.4.1 General . 49

9.4.2 Design principles . 49

9.5 Design of composite structures . 49

9.5.1 General . 49

9.5.2 Design principles . 50

9.5.3 Joints and interfaces . 52

10 Electrical, mechanical, instrumentation and control systems . 52

10.1 Overview. 52
10.2 General requirements . 52
10.3 Abnormal operating conditions safeguard . 53
11 Mooring and foundation considerations . 54
11.1 Overview. 54
11.1.1 General . 54
11.1.2 Unique challenges for wave energy converters . 54
11.1.3 Unique challenges for tidal energy converters . 54
11.2 Tethered floating structures . 54
11.3 Fixed structures . 55
11.4 Compound MEC structures . 55
12 Inspection requirements . 57
12.1 General . 57
12.2 Consideration during the design stage . 57
12.3 Inspection and maintenance planning . 58
12.4 Data management . 58
12.5 Condition assessment and integrity evaluation (against performance
requirements) . 59
12.6 Maintenance execution . 59
13 Life cycle considerations . 60
13.1 General . 60
13.2 Planning . 62
13.2.1 General . 62
13.2.2 Installation conditions . 62
13.2.3 Site access . 62

13.2.4 Environmental conditions . 62
13.3 Documentation . 63
13.4 Receiving, handling and storage . 63
13.5 Assembly of and installation of MECs . 63
13.5.1 General . 63
13.5.2 Access . 64
13.6 Fasteners and attachments . 64
13.7 Cranes, hoists and lifting equipment . 64
13.8 Decommissioning . 64
Annex A (normative) Load definition and load combinations . 66
A.1 Load combinations . 66
A.2 Load calculations . 67
A.3 Floating and moored devices . 69

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IEC TS 62600-2:2016 © IEC 2016 – 5 –


A.4 Flow analysis methodology . 69

Annex B (normative) Reliability issues . 71


B.1 General . 71

B.2 Structure and foundation . 71

B.3 Mechanical system . 71

B.4 Electrical system . 72

B.5 Control and protection system . 72

B.6 Instrumentation . 72

B.7 Testing during qualification . 72


Annex C (normative) Corrosion protection . 73
C.1 General . 73
C.2 Steel structures . 73
C.2.1 General . 73
C.2.2 Corrosion rates . 74
C.2.3 Protective coatings . 74
C.3 Cathodic protection . 74
C.3.1 General . 74
C.3.2 Closed compartments. 75
C.3.3 Stainless steel . 75
C.4 Concrete structures . 75
C.4.1 General . 75
C.4.2 Provision of adequate cover . 75
C.4.3 Use of stainless steel or composite reinforcement . 76
C.4.4 Cathodic protection of reinforcement . 76
C.5 Non-ferrous metals . 76
C.6 Composite structures . 77
C.7 Compatibility of materials . 77
C.8 Chains, steel wire and fibre rope . 77
Annex D (normative) Operational and structural resonance . 78
D.1 General . 78
D.2 Control systems . 78
D.3 Exciting frequencies . 78
D.4 Natural frequencies . 78
D.5 Analysis . 79
D.6 Balancing of the rotating components . 79

Annex E (informative) Requirements for a basis of design. 80
E.1 General . 80
E.2 Design life . 82
E.3 Design standards . 82
E.4 Regional regulations . 82
E.5 Environmental conditions . 82
E.5.1 General . 82
E.5.2 Meteorology and climatology . 82
E.5.3 Air/water conditions . 82
E.5.4 Water level . 83
E.5.5 Currents . 83
E.5.6 Waves . 83

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E.5.7 Marine life . 83

E.6 Seabed conditions . 83

E.6.1 General . 83

E.6.2 Bathymetry and coastal topography . 83

E.7 Material standards and testing . 84

Annex F (informative) Wave spectrum . 85

F.1 Overview. 85

F.2 The Pierson-Moskowitz spectrum . 85

F.3 Relationship between peak and zero crossing periods . 88


F.4 Wave directional spreading . 88
Annex G (informative) Shallow water hydrodynamics and breaking waves . 89
G.1 Selection of suitable wave theories . 89
G.2 Modelling of irregular wave trains . 90
G.3 Breaking waves . 90
Annex H (informative) Guidance on calculation of hydrodynamic loads . 93
H.1 General . 93
H.2 Large bodies . 94
H.3 Hybrid structures . 94
H.4 Short term statistics . 95
H.5 Breaking wave loads . 95
H.6 Dynamic loads due to turbulent flow . 96
Bibliography . 97

Figure 1 – Definition of water levels (see IEC 61400-3) . 24
Figure 2 – Examples of compound position mooring systems for wave (a, b) and tidal
(c, d) energy conversion systems . 56
Figure C.1 – Profile of the thickness loss resulting from corrosion of an unprotected
steel structure in seawater (1 mil = 0,025 4 mm) .
...