GB/T 46198-2025Corrosion of metals and alloys - Cathodic protection of offshore wind structures (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document adopts ISO 24656:2022 "Cathode protection of offshore wind structures".

The following minimal editorial changes have been made to this document.

---The standard title has been changed to "Catholic Protection of Offshore Wind Energy Structures from Corrosion of Metals and Alloys".

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China Iron and Steel Association.

This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).

Introduction

Cathodic protection (CP) can be used in conjunction with protective coatings to protect the submerged outer surfaces of offshore wind farm structures and appurtenances from seawater or marine environments.

Corrosion in the bottom environment.

Cathodic protection, along with protective coatings, can be used to protect internally submerged surfaces exposed to the seabed and sediments from corrosion.

ISO 12473 details the general principles of cathodic protection in seawater.

Cathodic protection involves providing sufficient direct current to the surface of a structure to reduce the potential of the steel to a value where corrosion is negligible or low.

Cathodic protection is designed to protect the entire submerged area and the muddy area of a structure from corrosion. The parts not submerged in water are not affected by the cathodic protection system.

Protect.

This document provides guidelines for the use of existing marine meteorological data.

---Assess the cathodic protection requirements for surfaces in the fully immersed and normally humid areas;

---Determine the seawater flow velocity to evaluate cathodic protection design parameters.

This complements the primary use of marine meteorological data in structural design.

This document does not require cathodic protection designers to be experts in marine meteorological data; it provides the necessary information for the cathodic protection design process.

A guide to the application of data obtained from marine meteorological experts.

Corrosion of metals and alloys Cathodic protection of offshore wind energy structures

1 Scope

This document specifies the requirements for external and internal cathodic protection of offshore wind farm structures, applicable to structures in contact with seawater or seabed environments.

and its accessories.

This document relates to.

---Design and implementation of cathodic protection systems for new steel structures;

---Assessment of the remaining life of existing cathodic protection systems;

---The design and implementation of updated cathodic protection systems to improve protection levels or extend protection life;

---Inspect and monitor the performance of the existing cathodic protection system installed on the structure;

---Guidelines for cathodic protection of reinforced concrete structures.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

ISO 8501-1 Visual assessment of surface cleanliness of steel surfaces before coating – Part 1: Uncoated steel surfaces (of previous coatings) Note. GB/T 8923.1-2011 Visual assessment of surface cleanliness of steel surfaces before coating - Part 1: Uncoated steel surfaces and Rust level and treatment level of steel surface after complete removal of original coating (ISO 8501-1:2007, IDT) Note. GB/T 31316-2014 General Rules for Cathodic Protection of Seawater (ISO 12473:2006, IDT) crete) Note. GB/T 39154-2020 Corrosion of metals and alloys - Cathodic protection of reinforcing steel bars for concrete (ISO 12696:2016, IDT) Note. GB/T 27025-2019 General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:2017, IDT) Note. GB/T 4208-2017 Degrees of protection provided by enclosures (IP code) (IEC 60529:2013, IDT) IEC 61000-1-2 Electromagnetic compatibility (EMC) Part 1-2.General principles for the implementation of electrical and electronic systems (including those with electromagnetic phenomena)