Standard
Track updates
AS 2832.2-2003
[Current]Cathodic protection of metals, Part 2: Compact buried structures
Provides guidelines for the cathodic protection of external surfaces of compact buried structures, including tank farms, service station tanks, tower footings, steel pilings (in soil), short well castings, compressor pump stations and associated pipe work.
Published: 27/06/2003
Pages: 69
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope and general
1.1 Scope
1.2 Referenced documents
1.3 Definitions
2 Competence of personnel
3 Criteria for cathodic protection
3.1 Scope and general
3.1.1 Scope
3.1.2 General
3.2 Protection criteria
3.2.1 General
3.2.2 Potential criteria
3.2.2.1 General
3.2.2.2 Ferrous structure
3.2.2.3 Copper/copper alloy structure
3.2.2.4 Lead structure
3.2.2.5 Mixed metal structure
3.2.2.6 Structures subject to variable stray current effects
3.2.2.7 Traction current effects
3.2.3 100 mV polarization decay criterion
3.2.4 Alternative criteria
3.2.4.1 Coupon criterion
3.2.4.2 Resistance probe criterion
3.2.4.3 Other criteria
3.3 Overprotection
4 Measuring techniques and equipment
4.1 General
4.2 Potential measurement and equipment
4.2.1 General
4.2.2 Positioning of monitoring electrodes
4.2.3 Off-potential measurements
5 Design of structures to accommodate cathodic protection
5.1 Scope and general
5.1.1 Scope
5.1.2 General
5.2 Materials of construction
5.3 Coated and uncoated structures
5.4 Electrical hazards and disturbances
5.5 Test points
5.5.1 General
5.5.2 Location
5.5.3 In situ reference electrodes
5.6 Insulating joints (isolating joints)
5.7 Road and rail crossings
5.8 Electrical isolation
5.9 Electrical continuity
6 Design of cathodic protection systems
6.1 Scope and general
6.1.1 Scope
6.1.2 General
6.2 Safety hazards
6.3 Design requirements
6.4 Design data
6.4.1 General
6.4.2 Structure layout
6.4.3 Cathodic protection current requirements
6.4.4 Environment resistivity
6.4.5 Anode characteristics
6.5 Materials
6.5.1 General
6.5.2 d.c. cables
6.5.2.1 General
6.5.2.2 Insulation
6.5.2.3 Cable connections
6.5.3 Test cables
6.5.4 Anodes
6.5.5 Reference electrodes
6.5.6 Electrical isolation joints
6.6 Test points
6.7 References
6.8 Electrical earthing
6.9 Graphical symbols
7 Installation of cathodic protection systems
7.1 Scope
7.2 Approval to install
7.3 Installation practice
7.4 Inspection requirements for materials and equipment
7.4.1 General
7.4.2 Anodes
7.4.3 Cables
7.4.4 Transformer-rectifier equipment
7.4.5 Prefabricated insulated joints
7.5 Installation of galvanic anode systems
7.6 Installation of impressed current anode systems
7.6.1 Cabling
7.6.2 Anodes and groundbed
7.6.3 Cathodic protection unit
7.7 Installation of insulated flanges, joints and couplings
8 Control of interference with foreign structures
8.1 Scope and general
8.1.1 Scope
8.1.2 General
8.2 Statutory regulations
8.3 Minimization of interference current
8.3.1 Design of the system
8.3.2 Methods of minimizing interference currents
8.3.3 Detection of interference levels
8.3.4 Control of interference
8.3.4.1 General
8.3.4.2 Control by using galvanic anodes
8.3.4.3 Control by bonding
9 Commissioning of cathodic protection systems
9.1 Scope and general
9.1.1 Scope
9.1.2 General
9.2 Pre-energization testing
9.3 System operation and adjustment
9.4 Post-energization tests
9.5 Records
9.6 Operation manuals
10 Operation of cathodic protection systems
10.1 Scope and general
10.1.1 Scope
10.1.2 General
10.2 System operation checks
10.2.1 Impressed current systems
10.2.2 Galvanic anode installations
10.2.3 Current drainage systems
10.3 Structure inspections
10.4 Cathodic protection potential surveys
10.5 System re-approval
10.6 Records
11 Documentation of cathodic protection systems
11.1 System design documentation
11.2 Commissioning documentation
Appendix A
A1 Scope
A2 General components of cathodic protection installations
A3 Factors affecting the corrosion of buried or partially buried metallic structures
Appendix B
B1 General
B2 Measurement of polarization potential
B3 Measurement of structure potential by polarized potential techniques
Appendix C
C1 General
C2 Coupon
C3 Resistance probe
C4 Coupon and probe use
C5 Installation
Appendix D
D1 Scope and general
D1.1 Scope
D1.2 General
D2 Calibration
D3 Maintenance
Appendix E
Appendix F
F1 General
F2 Coating properties
F3 Coating choice
F4 Coating life
Appendix G
G1 Scope
G2 Categories of hazard
G2.1 General
G2.2 Electrical hazard relating to use of cathodic protection (CP) converters in compact structures
G3 List of electrical safety regulators
Appendix H
H1 Scope
H2 Determination of cathodic protection current requirements
H2.1 General
H2.2 Prediction of current requirement from design parameters
H2.3 Determination of current requirement by field test on existing structures
H3 Anode arrangements
H3.1 General
H3.2 Calculation of appropriate anode/structure separation
H3.3 Anode positioning
H3.3.1 Galvanic anodes
H3.3.2 Impressed current anodes
H3.4 Anode positioning details
H3.4.1 General
H3.4.2 Shallow groundbeds
H3.4.3 Deep-well groundbeds
H4 Anode materials and applications
H5 Galvanic anodes
H6 Calculation of anode output current
H6.1 General
H6.2 Modified Dwight formula
H6.3 Anode output current
H7 Power supply considerations
H8 Backfills
H8.1 Electronic conduction backfills
H8.2 Electrolytic conduction backfills
H9 Provision for stray currents
H10 System design documentation
Appendix I
Appendix J
Appendix K
Appendix L
L1 Factors affecting the regularity of structure inspections
L2 Location of test points
Appendix M
Appendix N
N1 Scope and general
N1.1 Scope
N1.2 General
N2 Minimization of stray current effects
N2.1 General
N2.2 Minimization of track leakage current at its source
N2.3 Mitigation of stray current pick-up and discharge from the structure
N2.4 Mitigation of stray current discharge using traction current drainage
N2.4.1 Reduction of discharge to soil
N2.4.2 Maximizing effectiveness of drainage bonds
N2.4.3 Drainage bond operation
Cited references in this standard
[Superseded]
Protection of structures against lightning — Part 1-2: General principles — Guide B — Design, installation, maintenance and inspection of lightning protection systems
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