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Exam API-571 topic 1 question 60 discussion

Actual exam question from API's API-571
Question #: 60
Topic #: 1
[All API-571 Questions]

High temperature hydrogen attack results from exposure to hydrogen at elevated temperatures and pressures. The hydrogen reacts with __________ in steel to produce _________, which cannot diffuse through the steel. The loss of carbides causes an overall loss in strength.

  • A. Carbides, oxygen
  • B. Alloys, hydrogen dioxide
  • C. Carbides, methane
  • D. Hydrogen dioxide, H²S
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Suggested Answer: C 🗳️
by ahmadmm at Sept. 5, 2023, 9:26 a.m.

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ahmadmm
1 year, 4 months ago
High-temperature hydrogen attack (HTHA) results from exposure of steels to hydrogen gas at elevated temperatures and pressures. Dissociated hydrogen atoms react with carbon and carbides in the steel to form CH4.
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