AMPP CP2 Technician study guide
AMPP CP2 Technician · Work through your exam, one topic at a time.
The AMPP CP2 Cathodic Protection Technician credential is an intermediate-level certification for people who install, test, and maintain cathodic protection systems on buried or submerged metallic structures - pipelines, tanks, well casings, and marine assets. It sits between the entry-level CP1 Tester and the CP3 Technologist, and it assumes you can already take a structure-to-electrolyte potential and read a multimeter without hand-holding. The AMPP CP2 Technician study guide has 8 sections and about 2,650 words.
01Electrical Fundamentals and Circuit Theory for Cathodic Protection
Cathodic protection is applied Ohm's law. Every CP circuit - galvanic or impressed current - consists of a source of driving voltage, an anode (current leaves into the electrolyte), the electrolyte (soil or water, which has resistance), the structure (current returns to the source), and metallic cables.
355 words, about 2 min02Cathodic Protection Theory and Protection Criteria
Corrosion is an electrochemical cell in which metal dissolves at the anode. Cathodic protection forces the entire exposed structure to behave as a cathode by supplying electrons from an external source.
356 words, about 2 min03Field Survey Methods and Potential Measurements
Almost every field survey is built on the structure-to-soil potential: a high-impedance voltmeter between the structure (via a test station) and a reference electrode placed in contact with the electrolyte. The copper-copper sulfate electrode (CSE) is the standard in soil; silver-silver chloride is common in water and concrete.
316 words, about 2 min04Galvanic (Sacrificial) Anode Systems
A galvanic anode protects because its open-circuit potential is more negative than the structure's. Magnesium (roughly −1.5 to −1.7 V CSE), zinc (about −1.1 V CSE), and aluminum alloys (used mainly in seawater and brines) are the three families.
308 words, about 2 min05Impressed Current Systems, Rectifiers, and Groundbeds
An impressed current system uses an external DC source - nearly always a rectifier fed from AC - to drive current from a groundbed through the electrolyte to the structure. Because the driving voltage can be tens of volts, groundbed resistance is less limiting and the system can protect large, poorly coated structures in high-resistivity soil.
331 words, about 2 min06Stray Current and Interference
Stray current is current flowing through the earth or a structure on a path not intended by the CP designer. The rule to memorize: current discharging from metal into electrolyte causes corrosion; current entering metal is protective.
354 words, about 2 min07Coatings and Their Interaction with Cathodic Protection
A coating is the primary barrier; CP protects the holidays and damaged areas the coating cannot cover. Coating quality controls current demand by orders of magnitude.
303 words, about 2 min08Safety, Installation Practices, and System Troubleshooting
Rectifiers expose AC and DC at hazardous voltages; use lockout/tagout before opening a cabinet, and treat the DC output as live whenever the AC breaker is closed. Cathodic protection generates hydrogen and oxygen at the structure and anodes; deep-well groundbeds and casings can accumulate gas, so vent and test before entering or working near them.
327 words, about 2 min