BSI PD IEC/TS 62600-10:2015
$198.66
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 | 2015 | 54 |
The purpose of this Technical Specification is to provide uniform methodologies for the design and assessment of mooring systems for floating MECs (as defined in TC114 scope). It is intended to be applied at various stages, from mooring system assessment to design, installation and maintenance of floating MEC plants.
This technical specification is applicable to mooring systems for floating MEC 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 technical specification is to highlight the different requirements of MECs 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 technical specification.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | CONTENTS |
| 8 | FOREWORD |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references 3 Terms and definitions |
| 13 | 4 Abbreviated terms |
| 14 | 5 Principal element 5.1 General 5.2 Mooring and anchor systems 5.3 Design considerations |
| 15 | 5.4 Safety and risk consideration 5.5 Analysis procedure 5.6 Inspection and maintenance requirements 6 Types of moorings and anchoring systems 6.1 General 6.2 Mooring systems 6.2.1 General 6.2.2 Spread moorings (catenary, taut-line and semi-taut-line) |
| 16 | 6.2.3 Single point moorings (SPM) Figures Figure 1 – Spread mooring configuration Figure 2 – Catenary anchor leg mooring configuration |
| 17 | 6.3 Mooring line components 6.3.1 General 6.3.2 Chain Figure 3 – Single anchor leg mooring configuration Figure 4 – Turret mooring configuration |
| 18 | 6.3.3 Wire rope Figure 5 – Studless and studlink chain Figure 6 – Typical wire rope construction |
| 19 | 6.3.4 Synthetic rope 6.3.5 Clump weights 6.3.6 Buoyancy aids 6.3.7 Connectors and accessories |
| 20 | 6.4 Anchors types 6.4.1 General 6.4.2 Drag embedment anchor Figure 7 – Types of connectors |
| 21 | 6.4.3 Pile anchor 6.4.4 Suction anchor Figure 8 – HHP drag embedment anchor Figure 9 – Pile anchor |
| 22 | 6.4.5 Gravity installed anchor 6.4.6 Gravity anchor Figure 10 – Suction anchor Figure 11 – Gravity installed anchor |
| 23 | 6.4.7 Plate anchor 6.4.8 Screw anchor Figure 12 – Gravity anchor Figure 13 – Plate anchor |
| 24 | 7 Design consideration 7.1 General 7.2 Limit states 7.2.1 Ultimate limit state (ULS) 7.2.2 Accidental limit state (ALS) 7.2.3 Serviceability limit state (SLS) 7.2.4 Fatigue limit state (FLS) Figure 14 – Screw anchor |
| 25 | 7.3 External conditions 7.3.1 General 7.3.2 Metocean conditions 7.3.3 Marine growth 7.3.4 Marine life 7.3.5 Environmentally sensitive and protected areas and marine animals 7.3.6 Nearshore impact 7.3.7 Vandalism and misuse Tables Table 1 – Potential nearshore impacts |
| 26 | 7.3.8 Marine traffic 7.4 Assorted loading 7.4.1 General 7.4.2 Low frequency loads 7.4.3 Wave frequency loads on mooring components |
| 27 | 7.4.4 Wave frequency loads on MEC 7.4.5 High frequency loading 7.5 Mooring line components 7.5.1 Component strength 7.5.2 Component fatigue life 7.5.3 Redundancy 7.5.4 Clearance |
| 28 | 7.6 Umbilical considerations 7.6.1 Umbilical response 7.6.2 Umbilical strength 7.6.3 Umbilical offset and clearance limits 7.7 Anchors 7.7.1 Type selection 7.7.2 Holding capacity 7.7.3 Sediment and rock conditions |
| 29 | 7.7.4 Fluke setting 7.7.5 Installation 7.7.6 Proof loading 7.7.7 Directional anchor loading 7.7.8 Failure mode 7.7.9 Environmental loading 8 Safety and risk considerations 8.1 Overview 8.2 Risk 8.2.1 General |
| 30 | 8.2.2 Definition 8.2.3 Consequence types 8.2.4 General risk mitigation 8.2.5 ALARP principle 8.3 Risk assessment methodology 8.3.1 General |
| 31 | 8.3.2 Methodology flowchart |
| 32 | 8.3.3 Basic considerations Figure 15 – General risk methodology flowchart |
| 33 | 8.3.4 Probability assessment 8.3.5 Consequence classification assessment 8.4 Consequence considerations for mooring failure 8.5 Consequence classification 8.5.1 General Table 2 – Consequence categories |
| 34 | 8.5.2 Consequence impact considerations Table 3 – Consequence class |
| 35 | 8.5.3 Waterway navigation impacts 8.5.4 Environmentally sensitive and protected sites 8.5.5 Archaeological sites 8.6 Risk mitigation considerations 8.6.1 Mitigation overview 8.6.2 Probability reduction 8.6.3 Consequence reduction |
| 36 | 8.7 Risk acceptance 8.7.1 Acceptance overview 8.7.2 Documentation 9 Analysis procedure 9.1 General 9.2 Basic considerations |
| 37 | 9.3 Analysis procedure overview Figure 16 – Conceptual mooring analysis procedure |
| 38 | 9.4 Modelling consideration 9.4.1 General 9.4.2 Mooring and umbilical models 9.4.3 Floating unit numerical models |
| 39 | 9.4.4 Coupled and uncoupled analysis 9.5 Analysis procedure considerations 9.5.1 Metocean directionality 9.5.2 Resonant response 9.5.3 Dynamic mooring analysis |
| 40 | 9.5.4 Design situations of ULS 9.5.5 Design situations of ALS 9.5.6 Design situations of FLS 9.5.7 Design situations of SLS 9.6 Mooring design criteria 9.6.1 Design return period 9.6.2 Consequence class design factor |
| 41 | 9.6.3 Mooring line component failure 9.6.4 Anchor holding capacity Table 4 – Consequence class associated design factors Table 5 – Safety factors for ULS and ALS conditions |
| 42 | 10 In-service inspection, monitoring, testing, and maintenance 10.1 General Table 6 – Safety factors for holding capacity of drag anchors factors Table 7 – Safety factors for holding capacity of anchor piles and suction piles Table 8 – Safety factors for holding capacity of gravity and plate anchors |
| 43 | 10.2 Mooring system proof loading 10.3 Component replacement 10.4 In air and splash zone mooring line sections 10.5 Submerged mooring line sections |
| 44 | 10.6 Commissioning and decommissioning procedures |
| 45 | Annex A (informative)Sample mooring design A.1 General A.2 Problem layout Figure A.1 – Potential tidal current MEC installation locations A, B; artificial reef C; fish farm D; marine traffic corridor E |
| 46 | A.3 Consequence class identification |
| 47 | Table A.1 – Consequence classification matrix: location A |
| 48 | Table A.2 – Consequence classification matrix: location B |
| 49 | A.4 Mooring design process |
| 50 | Figure A.2 – Mooring line component minimum ASF for each return periodenvironment 5, 10, 20, 50, and 100 plotted to determine mooring ULS return period Figure A.3 – Anchor minimum ASF for each return periodenvironment 5, 10, 20, 50, and 100 plotted to determine anchor ULS return period |
| 52 | Bibliography |
