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GB/Z 44047-2024Floating offshore wind turbines - Design requirements (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

May 28, 2024

Implementation date

December 1, 2024

Scope

GB/Z 44047-2024 (Floating offshore wind turbines - Design requirements) is available as an English-translated PDF.

GB/Z 44047-2024 is the Chinese standard "Floating offshore wind turbines - Design requirements".

Its scope clause reads: This document specifies additional requirements for the assessment of external conditions at floating offshore wind turbine (FOWT) sites and for ensuring The basic design requirements for the engineering integrity of FOWTs are to provide an appropriate level of protection during the expected life cycle of the unit against Prevent various risks from causing damage to the unit.

This document focuses on the engineering integrity of the FOWT structural components, but also addresses the mechanical devices of the control and protection systems, the internal electrical systems, and the subsystems such as system and mechanical system.

If the floating foundation of a wind turbine is subjected to hydrodynamic loads and supported by buoyancy and an anchoring system, the wind The generator set is considered as FOWT.

FOWT consists of five main subsystems. wind turbine nacelle assembly (RNA), tower, floating foundation, anchor Systems and supporting machinery, equipment and systems that do not belong to RNA.

The following types of floating foundation structures are explicitly considered in this document. a) Ship and barge structures; b) Semi-submersible; c) Single column type (Spar); d) Tension Leg Platform/Buoy (TLP/T LB).

In addition to the types of structures listed above, this document also generally includes other floating platforms used to support wind turbines. These platform structures may vary greatly in geometry and construction type and therefore may only partially meet the requirements of this document.

In all such cases, the specific requirements set forth in this document may not apply to the design of all or part of such structures. The conformity of the components requires that the basic principles followed in the design meet or exceed the safety level required by this document.

This document applies to unmanned floating structures with a single horizontal axis wind turbine. Axis wind turbines or combined wind/wave energy systems may require additional design considerations.

This document is used in conjunction with the corresponding IEC and ISO standards referenced in Chapter 2.This document fully complies with IEC 61400-1 and The safety level of FOWT designed according to this document meets or exceeds the requirements of IEC 61400-1 and IEC 61400- The level specified in 3-1. Its clauses include design requirements).

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Document preview — GB/Z 44047-2024

National Standard of the People's Republic of China

Classification: F 11

Issued by: State Administration for Market Regulation, China National Standardization Administration

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 Symbols and abbreviations
4.1 Symbols and units
4.2 Abbreviations
5 General requirements
5.2 Design Method
5.6 Support structure identification
6 External conditions - definition and assessment
6.1 General
7 Structural design
7.1 General
7.3 Load
7.4 Design conditions and load cases
7.5 Calculation of loads and load effects
7.6 Limit state analysis
8 Control and protection systems
9 Mechanical System
10 Electrical system
11 Design of pile foundation and its auxiliary structures
12 Assembly, installation and hoisting
12.1 Overview
12.2 General
12.3 Plan
12.13 Floating specific projects
13 Debugging, operation and maintenance
13.1 Overview
13.3 Debugging Instructions
13.4 Operator's Manual
13.5 Maintenance Manual
14 Anchoring system
15 Floating stability
15.1 General
15.2 Complete static stability criteria
15.3 Alternative criteria for intact stability based on dynamic response
15.4 Damage stability criteria
16 Materials
17 Offshore support systems
17.1 General
17.2 Bilge Water Treatment System
17.3 Ballast system
Appendix A (Informative) Key Design Parameters of Floating Offshore Wind Turbines
Appendix B (informative) Shallow water hydrodynamics and breaking waves
Appendix C (Informative) Guidelines for Calculation of Hydrodynamic Loads
Appendix E (Informative) Design of anchorage and auxiliary structures of floating offshore wind turbines
Appendix G (informative) Corrosion protection
Appendix H (Informative) Prediction of Extreme Wave Height During Tropical Cyclones
Appendix I (Informative) Recommendations for Calibration of Safety Levels in Tropical Cyclone Regions
Appendix J (Informative) Earthquake
Appendix K (Informative) Model Test
Appendix L (Informative) Tsunami
Appendix M (Informative) Non-redundant anchoring systems
Appendix N (Informative) Differences between limit state methods in wind power and marine standards
Appendix O (Informative) Application of non-standard sustained extreme operating gusts
References

1 Scope

This document specifies additional requirements for the assessment of external conditions at floating offshore wind turbine (FOWT) sites and for ensuring

The basic design requirements for the engineering integrity of FOWTs are to provide an appropriate level of protection during the expected life cycle of the unit against

Prevent various risks from causing damage to the unit.

If the floating foundation of a wind turbine is subjected to hydrodynamic loads and supported by buoyancy and an anchoring system, the wind

The generator set is considered as FOWT. FOWT consists of five main subsystems. wind turbine nacelle assembly (RNA), tower, floating foundation, anchor

Systems and supporting machinery, equipment and systems that do not belong to RNA.

The following types of floating foundation structures are explicitly considered in this document.

a) Ship and barge structures;

b) Semi-submersible;

c) Single column type (Spar);

d) Tension Leg Platform/Buoy (TLP/T LB).

In addition to the types of structures listed above, this document also generally includes other floating platforms used to support wind turbines.

These platform structures may vary greatly in geometry and construction type and therefore may only partially meet the requirements of this document.

In all such cases, the specific requirements set forth in this document may not apply to the design of all or part of such structures.

The conformity of the components requires that the basic principles followed in the design meet or exceed the safety level required by this document.

This document applies to unmanned floating structures with a single horizontal axis wind turbine.

Axis wind turbines or combined wind/wave energy systems may require additional design considerations.

This document is used in conjunction with the corresponding IEC and ISO standards referenced in Chapter 2.This document fully complies with IEC 61400-1 and

The safety level of FOWT designed according to this document meets or exceeds the requirements of IEC 61400-1 and IEC 61400-

The level specified in 3-1.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to

This document.

1 Design requirements)

Note. GB/T 18451.1-2022 Design requirements for wind turbines (IEC 61400-1.2019, IDT)

IEC 61400-3-1.2019 Wind energy generation systems Part 3-1.Design requirements for fixed offshore wind turbines

Note. GB/T 31517.1-2022 Design requirements for fixed offshore wind turbines (IEC 61400-3-1.2019, IDT)

ISO.19901-1.2015 Particular requirements for offshore structures for the petroleum and natural gas industries Part 1.Marine meteorological design and operation

GB/T 25387.1 | GB/T 25388.1 | GB/T 25389.1 | GB/T 47555 | GB/Z 44048 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 76 pages — is available in the English PDF.

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