AMPP CP4 Specialist study guide
AMPP CP4 Specialist · Work through your exam, one topic at a time.
The Cathodic Protection Specialist (CP4) Certification is the highest tier in the AMPP Cathodic Protection Program, a four-step pathway that begins with the Cathodic Protection Tester (CP1) and progresses through Technician (CP2) and Technologist (CP3). According to AMPP, the CP4 course focuses on the principles and procedures for CP design on a variety of structures for both galvanic and impressed current systems, and covers the theoretical concepts and considerations that influence the design and calculations, including attenuation, of a cathodic protection system. AMPP describes the certification as intended for those responsible for the design, installation, and maintenance of cathodic protection systems, and the broader CP program is aimed at field personnel, engineers, project managers, and technical sales personnel. Because CP4 sits at the design end of the pathway, expect the material to demand comfort with current demand, anode and groundbed sizing, circuit resistance, and voltage/current attenuation along extended structures, rather than only field measurement technique. The AMPP CP4 Specialist study guide has 3 sections and about 1,030 words.
01Galvanic CP Design: Principles and Procedures Across Structures
A galvanic (sacrificial anode) system protects a structure by coupling it to a more active metal. The anode's open-circuit potential must be sufficiently negative relative to the structure's protection criterion, and the driving voltage must overcome polarization plus circuit resistance.
368 words, about 2 min02Impressed Current CP Design: Principles and Procedures Across Structures
Impressed current systems (ICCP) use an external DC power source to drive current from inert or semi-inert anodes to the structure. Because the driving voltage is externally supplied, anode-to-structure potential difference is not limited by galvanic series, allowing large current output, long current throw, and use of inert anodes with low mass consumption.
342 words, about 2 min03Theoretical Concepts, Calculations, and Attenuation
Cathodic protection depends on shifting the structure potential to the protection criterion by supplying cathodic current. Key concepts: electrochemical potential, polarization (activation and concentration), IR drop, and the difference between 'on' and 'instant-off' potentials.
320 words, about 2 min