AMPP CP4 Cathodic Protection Specialist Certification Guide
                     AMPP
AMPP-CP4
ExamName: Cathodic Protection Specialist (CP4)
Exam Version: 6.0
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Question 1. (Single Select)
Which of the following statements about coupon test stations is MOST accurate?
A: They are only used to measure coating resistance
B: Coupon readings are generally more reliable than direct pipe-to-soil potential measurements
C: They provide an equivalent surface for corrosion rate evaluation, influenced by local conditions
D: They directly measure the IR free potential on the pipeline
Answer: C
Explanation:
Coupon test stations provide a metallic surface under conditions similar to the pipeline surface, used to
evaluate corrosion rates, but their readings are influenced by local conditions and do not directly provide IR
free potentials.
Question 2. (Single Select)
Short investigation on tank ringwall: four anodes show zero current output despite 8.4 A rectifier output.
Side-drain potentials identical to tank bottom. Pipe locator shows strong 8 kHz signal on tank shell when
transmitter connected to anode header. Diagnosis:
A: All four anodes consumed
B: Anodes installed in high-resistivity backfill
C: Rectifier positive connected to tank instead of anodes
D: Header cable shorted to tank shell/chime
Answer: D
Explanation:
Strong locator signal on the tank shell when transmitter is on anode header proves direct metallic
connection between anode header and tank. Current is bypassing anodes entirely and discharging from
tank shell.
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