API Certification Exams Pack
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- Exam Name: Corrosion and Materials Professional
- 149 Questions Answers with Explanation Detail
- Total Questions: 149 Q&A's
- Single Choice Questions: 149 Q&A's
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API-571 - Corrosion and Materials Professional
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Total Questions: 149
Free Practice Questions: 44
Amine stress corrosion cracking is most likely to occur in what services?
Answer
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C
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Explanation
From API RP 571 Section 5.1.2.7 (Amine Stress Corrosion Cracking) and API RP 945 (Avoiding Environmental Cracking in Amine Units): MEA (Monoethanolamine) systems are most aggressive due to: “Their high reactivity and degradation potential producing corrosive by-products that promote cracking.” API RP 945: “SCC in carbon steel is most frequently reported in MEA units, especially where localized concentrations of heat-stable salts exist.” Thus, Option C (MEA) is the correct answer due to its high SCC risk. |
The stream from a crude atmospheric overhead goes to the tube side of a shell-and-tube condenser with a temperature of 300°F (149°C) and a pressure of 10 psig (69 kPa). As the stream begins to condense water, its hydrochloric acid content lowers the water pH to about 4.0. Which of the following would be the best alloy selection for the tubes with cooling water on the shell side?
Answer
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B
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Explanation
API RP 571 notes in the context of Hydrochloric Acid Corrosion in overhead condensers: “Titanium is highly resistant to low pH acidic aqueous phases, including hydrochloric acid formed during condensation in overhead systems.” “Stainless steels like 316 and 410 are not suitable in the presence of free chlorides at low pH and elevated temperatures.” (Reference: API RP 571, Section 4.3.3.3 – Hydrochloric Acid Corrosion) Thus, Titanium is the preferred alloy under the described acidic and high-temperature conditions, making option B correct. |
In what damage mechanism does hydrogen combine with carbides in steel to form bubbles or cavities of CH₄?
Answer
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D
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Explanation
According to API RP 571, under High Temperature Hydrogen Attack (HTHA): “HTHA occurs when hydrogen diffuses into steel at elevated temperatures and reacts with carbides in the steel matrix to form methane (CH₄).” “The methane is unable to diffuse out of the steel and forms internal pressures, leading to fissuring, decarburization, and eventual failure.” “HTHA typically affects carbon steels and low alloy steels exposed to high temperature hydrogen services, particularly above 400°F (204°C) depending on partial pressure of hydrogen.” (Reference: API RP 571, Section 4.2.1.3 – High Temperature Hydrogen Attack) Hence, option D is the correct and technically supported answer. |
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API API-571 FAQ'S
Find answers to the most common questions about the API API-571 exam, including what it is, how to prepare, and how it can boost your career.
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