API 571 3.67 Wet H2S Damage Exam
Questions and Answers (Latest
Update 2026)
Hydrogen blistering is caused by
A atomic hydrogen collects in a discontinuity & combines to form
molecular hydrogen
B molecular hydrogen collects in a discontinuity & breaks apart to
form atomic hydrogen.
C atomic hydrogen reacts with carbon in the steel to form methane
gas.
D molecular hydrogen reacts with iron in the steel form ironized gas
-
correct answer ✅atomic hydrogen collects in a discontinuity &
combines to form molecular hydrogen
Atomic hydrogen is:
A. the form of hydrogen that is commonly used in hydrogen
systems. B released during cavitation.
C released during some corrosion reactions
D Released as water boils -
correct answer ✅released during some corrosion reactions
Which chemical keeps atomic hydrogen from recombining into
molecular hydrogen?
, API 571 3.67 Wet H2S Damage Exam
Questions and Answers (Latest
Update 2026)
A Carbon
B Chrome
C Chloride
D Nickel
E Sulfur -
correct answer ✅Sulfur
In a hydrogen blister, what causes the pressure to build?
A. Increasing temperature
B The increasing number of hydrogen molecules in a discontinuity
C. The increasing number of hydrogen atoms in a discontinuity
D. The increasing number of methane molecules in a discontinuity -
correct answer ✅The increasing number of hydrogen molecules in
a discontinuity
5. Hydrogen blisters that form at different depths can cause:
A. a very large blister.
B cracking between the blisters.
C. dealloying.
Questions and Answers (Latest
Update 2026)
Hydrogen blistering is caused by
A atomic hydrogen collects in a discontinuity & combines to form
molecular hydrogen
B molecular hydrogen collects in a discontinuity & breaks apart to
form atomic hydrogen.
C atomic hydrogen reacts with carbon in the steel to form methane
gas.
D molecular hydrogen reacts with iron in the steel form ironized gas
-
correct answer ✅atomic hydrogen collects in a discontinuity &
combines to form molecular hydrogen
Atomic hydrogen is:
A. the form of hydrogen that is commonly used in hydrogen
systems. B released during cavitation.
C released during some corrosion reactions
D Released as water boils -
correct answer ✅released during some corrosion reactions
Which chemical keeps atomic hydrogen from recombining into
molecular hydrogen?
, API 571 3.67 Wet H2S Damage Exam
Questions and Answers (Latest
Update 2026)
A Carbon
B Chrome
C Chloride
D Nickel
E Sulfur -
correct answer ✅Sulfur
In a hydrogen blister, what causes the pressure to build?
A. Increasing temperature
B The increasing number of hydrogen molecules in a discontinuity
C. The increasing number of hydrogen atoms in a discontinuity
D. The increasing number of methane molecules in a discontinuity -
correct answer ✅The increasing number of hydrogen molecules in
a discontinuity
5. Hydrogen blisters that form at different depths can cause:
A. a very large blister.
B cracking between the blisters.
C. dealloying.
