CP 1 – Cathodic Protection Tester Course Manual
©
NACE International, 2000
02/01/05
Section 3
Chapter 3–Underground Corrosion Control
Materials Selection...................................................................................... 3:1
Protective Coatings ..................................................................................... 3:1
Underground or Submerged Structures .............................................................................
3:1
Types of Mill Applied Underground Coatings ..................................................................
3:2
Girth Weld and Other Field Coatings ................................................................................
3:3
Electrical Isolation ...................................................................................... 3:4
Environmental Control................................................................................ 3:4
Inhibitors............................................................................................................................
3:5
Adjustment of pH ..............................................................................................................
3:5
Maintenance of Environmental Control ............................................................................
3:5
Cathodic Protection..................................................................................... 3:6
Theory ...............................................................................................................................
3:6
Definition...........................................................................................................................
3:7
Structures That Can be Cathodically Protected .......................................... 3:8
Galvanic Anode Systems...................................................................................................
3:9
Anodes...............................................................................................................................
3:9
Component Parts of Galvanic Systems............................................................................
3:11
Anodes.............................................................................................................................
3:11
Specifications of Galvanic Anode Systems .....................................................................
3:13
Impressed Current Systems....................................................................... 3:14
Power Sources .................................................................................................................
3:15
Limitations of Impressed Current Systems......................................................................
3:16
Component Parts of Impressed Current Systems.............................................................
3:16
Backfill ............................................................................................................................
3:18
Power Supply...................................................................................................................
3:18
Factors Influencing Operation of Cathodic Protection ............................. 3:22
Moisture Content of Soil .................................................................................................
3:22
Coating ............................................................................................................................
3:22
Soil Texture .....................................................................................................................
3:22
Temperature.....................................................................................................................
3:23
Oxygen Content...............................................................................................................
3:23
Movement of Structure and Electrolyte...........................................................................
3:23
Make up of the Electrolyte ..............................................................................................
3:24
Electrical Shielding..........................................................................................................
3:24
Criteria for Cathodic Protection................................................................ 3:25
NACE International Recommended Criteria ...................................................................
3:25
Other International Standards ..........................................................................................
3:32
Experiment 3-1–Demonstrate the Use of Cathodic Protection to Mitigate Local Action
Cell Corrosion .................................................................................................................
3:11
Experiment 3-2–Demonstrate Change in Polarized Potential with Time ........................
3:25
Summary of Contents for CP 1
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