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BS EN ISO 24656:2022

BS EN ISO 24656:2022

$215.11

Cathodic protection of offshore wind structures

Published By Publication Date Number of Pages
BSI 2022 122
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This document specifies the requirements for the external and internal cathodic protection for offshore wind farm structures. It is applicable for structures and appurtenances in contact with seawater or seabed environments. This document addresses: —    design and implementation of cathodic protection systems for new steel structures; —    assessment of residual life of existing cathodic protection systems; —    design and implementation of retrofit cathodic protection systems for improvement of the protection level or for life extension of the protection; —    inspection and performance monitoring of cathodic protection systems installed on existing structures, and —    guidance on cathodic protection of reinforced concrete structures.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
8 Foreword
9 Introduction
11 1 Scope
2 Normative references
3 Terms and definitions
15 4 Symbols and abbreviations
4.1 Symbols
17 4.2 Abbreviations
18 5 Competence of personnel
19 6 Structural considerations
6.1 Structures to be protected
20 6.2 Materials
6.3 Corrosion protection strategy
25 7 Cathodic protection criteria
7.1 Temporary protection
26 7.2 Steel structures
27 7.3 Reinforced concrete structures
8 Cathodic protection design
8.1 Objectives
28 8.2 Design considerations
8.2.1 General
29 8.2.2 External cathodic protection
8.2.3 Internal cathodic protection
30 8.3 CP Design life
8.4 Surface area considerations
8.4.1 General
8.4.2 Structure subdivision
31 8.5 Environmental factors
8.5.1 General
8.5.2 Seawater flow velocity
32 8.5.3 Electrolyte resistivity
8.5.4 Seawater temperature
8.5.5 Calcareous deposits
33 8.6 Protection current demand
8.6.1 General
8.6.2 Calculation of current demand, external surfaces
36 8.6.3 Calculation of current demand, internal surfaces
8.7 Electrical continuity and continuity bonds
37 8.8 Current drains and interactions
8.9 Installation considerations during design
38 9 Galvanic anode systems
9.1 General
9.2 Anode current availability
9.3 Galvanic anode alloys
39 9.4 Anode selection
40 9.5 Anode requirements
41 9.6 Anode distribution
42 10 Impressed current systems
10.1 General
43 10.2 Design considerations
10.2.1 General
10.2.2 Resilience of impressed current CP system by design
44 10.2.3 Current requirement of impressed current CP system
10.2.4 Impressed current CP system components
10.2.5 DC power source
46 10.2.6 Impressed current anodes
47 10.2.7 Reference electrodes
10.2.8 Dielectric shields
48 10.3 Installation of impressed current CP systems
49 10.4 Hybrid systems and temporary power for impressed current systems
10.5 Continuity bonds
11 Cable systems
11.1 General
50 11.2 Cathodic protection DC cables
51 11.3 Inter-array and export AC cables
53 12 Commissioning and surveys
12.1 Objectives
12.2 Galvanic anode systems
12.2.1 General
54 12.2.2 Detailed external surveys
12.2.3 Detailed internal surveys
55 12.3 Permanent CP monitoring systems
12.4 Impressed current systems
56 13 CP surveying and monitoring
13.1 Objectives
13.2 General considerations
58 13.3 Reference electrodes
13.4 Frequency of survey and monitoring
59 14 Retrofit cathodic protection systems
14.1 General considerations
14.2 Survey before retrofit
60 14.3 Retrofit for inadequate protection
14.4 Retrofit for structure life extension
61 14.5 All retrofits
62 14.6 Equipment considerations
63 15 Documentation
15.1 General
15.2 Design report
15.2.1 General
65 15.3 Material specification requirements
15.3.1 General
15.3.2 Galvanic anodes
66 15.3.3 Impressed current CP materials
69 15.4 Installation drawings and specifications
15.5 As-built installation and commissioning report requirements
70 15.6 Operation and maintenance requirements
16 Safety and cathodic protection
16.1 Objectives
71 16.2 Physical obstructions
16.3 Protection against electric shock
16.4 Gas evolution
16.4.1 Hydrogen evolution
72 16.4.2 Chlorine evolution
73 Annex A (informative) Environmental checklist
75 Annex B (normative) Method of using metocean data to calculate marked-up seawater flow velocity
88 Annex C (informative) Guidance on cathodic protection current density requirement for cathodic protection of wind offshore structures
96 Annex D (informative) Coatings and coating breakdown for CP design
100 Annex E (normative) Anode resistance and life calculation
107 Annex F (normative) Calculation of voltage drop down connection cables
109 Annex G (normative) Typical electrochemical characteristics for commonly used impressed current anodes
111 Annex H (informative) Permanent monitoring system design process
115 Annex I (informative) Cathodic protection modelling
118 Bibliography

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BS EN ISO 24656:2022
$215.11