Corrosion and Materials Professional (API-571) - API Actual Exam Questions
Last updated on April 11, 2026
Which of the following statements about high-temperature hydrogen attack is most accurate?
Acoustic emission testing is not a proven method for the detection of high-temperature hydrogen attack damage.
High-temperature hydrogen attack will most often be associated with the formation of surface blisters.
High-temperature hydrogen attack damage is most often limited to welds and heat-affected zones.
300 series stainless steels are also susceptible to high-temperature hydrogen attack at conditions normally seen in refinery units.
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For exchangers where the cooling water chemistry is poorly maintained, what can be done to improve corrosion resistance?
Lower the water velocity
Increase the tube diameter
Upgrade the metallurgy of the exchanger
Increase the process side temperature above 212°F (100°C)
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(What is the minimum pH value where chloride stress corrosion cracking begins to occur?)
2
4
7
10
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Decarburization damage is normally verified by:
Impact testing
Tensile testing
Bend testing
Metallographic testing
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Amine corrosion is primarily caused by:
amine solutions above 250°F (121°C).
amine concentration.
dissolved acid gases.
alkaline sour water.
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