Cathodic Protection
Cathodic protection, abbreviated as CP, is a method used to control corrosion on the surface of a metal which can be above or below ground pipes, tanks, vessels, etc. This process is accomplished by placing a sacrificial anode (material) connected to the protected metal.
Cathodic Protection standards
ASME Standards
- ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard
- ASME B16.9 - Factory-Made Wrought Buttwelding Fittings
- ASME B16.47 - Large Diameter Steel Flanges, NPS 26 Through NPS 60
- ASME B16.36 - Orifice Flanges
- ASME B31.4 - Pipeline Transportation Systems for Liquid Hydrocarbons and Other Liquids
- ASME B31.8 - Gas Transmission and Distribution Piping Systems
- ASME G8 - Standard Test Methods for Cathodic Disbonding of Pipeline Coatings
- ASME G14 - Testing Method for Impact Resistance of Pipeline Coatings (Falling Weight Test)
- ASME G95 - Testing Method for Cathodic Disbonding of Pipeline Coatings (Attached Cell Method)
AWWA Standards
- AWWA C209 - Cold-Applied Tape Coating for the Exterior of Special Sections, Connections, and Fittings for Steel Water Pipelinss
- AWWA C214 - Tape Coating Systems for the Exterior of Steel Water Pipelines
- AWWA C216 - Heat-Shrinkable Cross-Linked Polyolefin Coatings for the Exterior of Special Sections, Connections, and Fittings for Steel Water Pipelinss
- AWWA C222 - Polyurethane Coatings for the Interior and Exterior of Steel Water Pipe and Fittings
NACE Standards
- NACE RP0186 - Application of Cathodic Protection for External Structures of Steel Well Casings
- NACE SP0102 - In-Line Inspection of Pipelines
- NACE SP0104 - The Use of Coupons for Cathodic Protection Monitoring Applications
- NACE SP0106 - Control of Internal Corrosion in Steel Pipelines and Piping Systems
- NACE SP0169 - Control of External Corrosion on Underground or Submerged Metallic Piping Systems
- NACE SP0188 - Discontinuity (Holiday) Testing of Protective Coating
- NACE SP0193 - External Cathodic Protection of On-Grade Carbon Steel Storage Tank Bottoms
- NACE SP0216 - Steel-Cased Pipeline Practices
- NACE SP0205 - External Corrosion Control of Underground Storage Tank Systems by Cathodic Protection
- NACE SP0207 - Close-Internal Potential Surveys on Buried or Submerged Metalic Pipelines
- NACE SP0216 - Sacrificial Cathodic Protection of Reinforcing Steel in Atmospherically Exposed Concrete Structures
- NACE SP0290 - Impressed Current Protection of Reinforcing Steel in Atmospherically Exposed Concrete Structures
- NACE SP0502 - Pipeline External Corrosion Direct Assessment Methodology
- NACE SP0607 - Petroleum and Natural Gas Industries-Cathodic Protection of Pipeline
- NACE SP21434 - Cathodic Protection Systems for the Mitigation of External Corrosion of Buried and Submerged Metallic Piping Systems at Nuclear Power Plants
- NACE Publication 1E100 - Engineering Symbols Related to Cathodic Protection
- NACE TR01105 - Sacrificial Cathodic Protection of Reinforced Concrete Elements
- NACE TR21447 - Consequences of Coating Failures as Related to Interaction with Cathodic Protection
- NACE TR21463 - Criteria for Evaluation of Cathodic Protection Methods for Steel in Existing Concrete Structures
For Internal corrosion Protection see Pipeline Pigging
Cathodic Protection Associations
Mathematics Symbols
- See Algebra Symbols / Angle and Line Symbols / Basic Math Symbols / Bracket Symbols / Equivalence Symbols / Geometry Symbols / Greek Alphabet / Miscellaneous Symbols / Roman Numerals / Set Symbols / Square Root Symbols
Nomenclature & Symbols for Engineering, Mathematics, and Science
- See A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
List of all Site categories - List of all Tags
Cathodic Protection Nomenclature & Symbols
- \( AC \) - alternating current
- \( Al \) - aluminum
- \( Cu \) - brass (Cu & Zn)
- \( Bronze \) - bronze (Cu & Sn)
- \( CP \) - cathodic protection
- \( Cu \) - copper
- \( CRSN \) - corrosion
- \( CA \) - corrosion allowance
- \( CC \) - corrosion coupon
- \( CRES \) - corrosion resistant steel
- \( CRSV \) - corrosive
- \( I \) - current
- \( DC \) - direct current
- \( Q \) - electric charge
- \( Fe \) - iron
- \( Mg \) - magnesium
- \( Ti \) - titanium
- \( V \) - voltage
- \( Zn \) - zinc
Cathodic Protection Terms
- See A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z
A
- Abradable coating - It gives wear resistance to highly abrasive material when rubbed against, while leaving the underlying material damage free.
- Alternating current - An electric current that reverses its direction over and over.
- Anode - The electrons flow away the anode at which corrosion or oxidation occures at the material.
- Anode Polarisation - The electrochemical state changing of an electrode's potential moving in a corroding positive direction.
B
C
- Cathode - The electrons flow toward the cathode reducing the corrosion or oxidation of the material.
- Cathodic Polarisation - The electrochemical state changing of an electrode's potential moving in a non-corroding negative direction.
- Corrosion - The thinning of a pipe wall that is typically caused by a chemical reaction from a corroding fluid or agent and is limited almost exclusively to metal products.
- Corrosion allowance - The amount of material in a pipe or vessel that is available for corrosion without affecting the pressure containing integrity.
- Corrosion coupon - Used to monitor the corrosion rate of a material in a process.
- Current - The rate of flow of electricity in a circuit, measured in amperes.
D
- Direct current - An electric current that flows in only one direction.
E
- Electrode - Refered to as the anode or cathode, whichever is approperate.
- Electrode potential - The potential of an electrode in an electrolyte as a measure against a reference electrode.
- Electrolyte - A chemical substance or mixture, liquid or solid, normally liquid, which conducts electric current.
F
- Flux - Chemicals used to protect metals from oxidation.
- Fretting corrosion - Takes place where there is friction between two metal surfaces.
G
H
I
- Ion - An atom or molecular particle having a net charge. Positive charged ions are cations and negative charged are anions.
- Isolation gasket - Used to stop the current flow across metallic pipelines by separating two flanges.
J
K
L
M
N
O
- Ohm - A unit of resistance.
- Ohm's law - The relationships between power, voltage, current, and resistance.
- Oxidation - The loss of electrons in a chemical reaction in which an element combines with oxygen. Oxidation and reduction always occur at the same time in equal amounts.
P
- pH - Affects the corrosion rate by affecting the reaction rate of cathodes and anodes.
Q
R
S
- Stray current - The flow of electric current into the ground by the leakage on industrial currents.
T
U
V
- Volt - A unit of electrical pressure.
- Voltage - One volt is the amount of pressure that will cause one ampere of current in one ohm of resistance.
- Voltage coefficient of resistance - The change in resistance with applied voltage.
- Voltage drop - When the voltage at the end of the cable is less than the beginning of the cable.
- Voltage rating - The maximum voltage at which a cable or insulated conductor can be safetly maintained during continuous use in a normal manner.
W
X
Y
Z
Tags: Equations for Corrosion