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Corrosion and Materials Professional (API-571) - API Exam Questions

Last updated on July 22, 2026

97% Exam Compliance
149 Total Questions
1
Question
Severe internal grooving corrosion is found at the bottom of a 4-inch (101.6 mm) carbon steel piping system in steam condensate service. Which of the following is the most likely cause?
Options
A Erosion-corrosion
B Carbonate corrosion
C Carbon dioxide corrosion
D Ammonium bisulfide corrosion
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2
Question
Which of the following will be most effective in finding sour water corrosion?
Options
A Angle beam ultrasonic testing
B Profile radiographic testing
C Spot ultrasonic testing
D Guided wave ultrasonic testing
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3
Question
Caustic corrosion is most often associated with:
Options
A Caustic storage tanks (non-postweld heat treated)
B Caustic treaters
C Caustic injections in crude units
D Boilers and steam generating equipment
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4
Question
Nitriding of steels becomes most severe at temperatures above:
Options
A 900°F (480°C)
B 500°F (260°C)
C 200°F (95°C)
D 600°F (315°C)
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5
Question
Phosphoric acid corrosion in polymerization units is usually found under what circumstances?
Options
A When the acid dries out
B Turbulent flows
C Low velocity areas
D Two-phase flow
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