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Instant API-571 Access - Pass API-571 in One Time - API-571 Test Result

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What is the duration of the API-571 Exam

Number of Questions: 70
Format: Multiple choices, multiple answers
Length of Examination: 3.25 hours

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API Corrosion and Materials Professional Sample Questions (Q75-Q80):

NEW QUESTION # 75
In order for PASCC to occur the material must be ______.

A. Non-PWHT
B. Austenitic
C. PWHT
D. Sensitized

Answer: D

NEW QUESTION # 76
Where is PASCC normally located?

A. On impellers
B. At stress risers
C. At flanges
D. Adjacent to welds

Answer: D

Explanation:
Explanation

NEW QUESTION # 77
The remaining life of a component susceptible to creep damage can be cut in half by a/an:

A. increase in temperature of 25°F (15°C).
B. increase in stress of 10%.
C. sudden change in temperature.
D. increase in operating unit throughput.

Answer: A

Explanation:
According to API RP 571 Section 5.3.2.1 (Creep):
"Creep damage is exponentially dependent on temperature. A small increase in temperature (e.g., 25°F or 15° C) can reduce remaining life by more than half. This is because the creep rate increases rapidly with temperature, especially above design limits." Stress is a contributing factor, but the dominant and most sensitive variable is temperature.
Thus, Option C (increase in temperature of 25°F/15°C) is the correct answer.

NEW QUESTION # 78
Corrosion rates associated with hydrofluoric (HF) acid would be expected to increase if:

A. Temperatures are below 150°F (66°C) and there is less than 3% water
B. Temperature and water content increase
C. Copper-nickel alloy is used
D. HF acid concentration increases

Answer: B

Explanation:
According to API RP 571 and API RP 751 (HF Alkylation Units):
"HF acid corrosion rates increase with elevated temperature and higher water content. This is because water acts as an ionizing agent that facilitates the acid's attack on steel."
"Corrosion is minimized when water content is strictly controlled, usually between 0.5-1.5%."
"Contrary to some assumptions, increasing HF acid concentration actually decreases corrosivity." Hence, option B is correct.

NEW QUESTION # 79
Both sulfide stress corrosion cracking and stress-oriented hydrogen-induced cracking are most often found in:

A. Hardened steels.
B. Steel weldments.
C. Areas with temperatures above 300°F (149°C).
D. Areas where there is significant hydrogen blistering.

Answer: A

Explanation:
API RP 571 explains that both Sulfide Stress Cracking (SSC) and SOHIC are:
"Strongly influenced by material hardness. Carbon and low alloy steels with hardness exceeding 22 HRC (248 Brinell) are most susceptible."
"They occur in hardened steels under tensile stress, in the presence of wet H#S environments." (Reference: API RP 571, Sections 4.2.2.1 and 4.2.2.7 - SSC and SOHIC) Therefore, hardened steels are the common factor for both mechanisms, making option C the correct choice.

NEW QUESTION # 80
......

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