API 571 Corrosion and Materials Exam
Questions And Answers
Which of the following is the main concern for the potential of
brittle fracture in typical process service?
A. Start-up and shutdown of equipment
B. Overpressure during abnormal operation
C. Abnormal, transient stresses on typical process piping
D. Cyclic or intermittent services -
correct answer : A
Steel hardness and strength are critical factors for what type of
damage mechanism?
A. Carbonate corrosion stress cracking
B. Polythionic acid cracking
C. Hydrogen stress cracking—HF
D. Amine stress corrosion cracking -
correct answer : C
Which of the following is most susceptible to chloride stress
corrosion cracking?
A. Non-stress-relieved admiralty brass U-bends
B. Inadequately heat-treated 1.25 Cr-0.5 Mo low-alloy steel
, API 571 Corrosion and Materials Exam
Questions And Answers
C. Non-stress-relieved 304 stainless steel
D. Non-postweld heat-treated carbon steel -
correct answer : C
Which of the following damage mechanisms are most closely
related because they occur in similar environments?
A. Carburization and metal dusting
B. Oxidation and sulfidation
C. Fuel ash corrosion and flue gas dew-point corrosion
D. Carbonate corrosion and CO₂ corrosion -
correct answer : B
Which of the following will be most effective in finding sour water
corrosion?
A. Spot ultrasonic testing
B. Profile radiographic testing
C. Guided wave ultrasonic testing
D. Angle beam ultrasonic testing -
correct answer : B
Questions And Answers
Which of the following is the main concern for the potential of
brittle fracture in typical process service?
A. Start-up and shutdown of equipment
B. Overpressure during abnormal operation
C. Abnormal, transient stresses on typical process piping
D. Cyclic or intermittent services -
correct answer : A
Steel hardness and strength are critical factors for what type of
damage mechanism?
A. Carbonate corrosion stress cracking
B. Polythionic acid cracking
C. Hydrogen stress cracking—HF
D. Amine stress corrosion cracking -
correct answer : C
Which of the following is most susceptible to chloride stress
corrosion cracking?
A. Non-stress-relieved admiralty brass U-bends
B. Inadequately heat-treated 1.25 Cr-0.5 Mo low-alloy steel
, API 571 Corrosion and Materials Exam
Questions And Answers
C. Non-stress-relieved 304 stainless steel
D. Non-postweld heat-treated carbon steel -
correct answer : C
Which of the following damage mechanisms are most closely
related because they occur in similar environments?
A. Carburization and metal dusting
B. Oxidation and sulfidation
C. Fuel ash corrosion and flue gas dew-point corrosion
D. Carbonate corrosion and CO₂ corrosion -
correct answer : B
Which of the following will be most effective in finding sour water
corrosion?
A. Spot ultrasonic testing
B. Profile radiographic testing
C. Guided wave ultrasonic testing
D. Angle beam ultrasonic testing -
correct answer : B
