Best API API-571 2025 Training With 112 QA's
API API-571 Certification Exam Questions
NEW QUESTION # 18
MIC is often characterized by _______ within pits in carbon steel.
- A. Worm holes
- B. Tubercles
- C. Cup shaped pits
- D. Oxide
Answer: C
NEW QUESTION # 19
The type of organic acids in crude feedstocks that are of most concern for corrosion in crude unit overheads are those:
- A. That condense above the water dew point
- B. With naphthenic acids
- C. With low molecular weight
- D. That are not soluble in naphtha
Answer: A
Explanation:
API RP 571, under Organic Acid Corrosion, highlights:
"Corrosive organic acids in overhead systems are those that condense at temperatures above the water dew point. These acids condense independently of water and can form highly concentrated corrosive films."
"When acids condense first, they aggressively corrode carbon steel prior to any water wash mitigation." (Reference: API RP 571, Section 4.3.3.9 - Organic Acid Corrosion) Hence, option D correctly identifies the most aggressive corrosion scenario.
NEW QUESTION # 20
For pressure vessels, inspection should focus on welds of ________ operating in the creep range.
- A. Stainless steel
- B. CrMo alloys
- C. Low hydrogen electrodes
- D. Carbon steel
Answer: B
NEW QUESTION # 21
Cracking of a metal due to stress relaxation during PWHT or in service at elevated temperatures is called
______. It is most often found in heavy wall sections.
- A. Step-like cracking
- B. None of the above
- C. Reheat cracking
- D. Thermal cracking
Answer: C
NEW QUESTION # 22
Hydrogen blisters may form as surface bulges on the ID, the OD on within the wall thickness of a pipe or pressure vessel. Blistering occurs from hydrogen generated by ______, not hydrogen gas from the process stream.
- A. Corrosion
- B. Hydriding
- C. H2S
- D. Sulfur
Answer: A
Explanation:
Explanation
NEW QUESTION # 23
The 300 series stainless steels (austenitic stainless steels) are generally resistant to oxidation up to what temperature?
- A. 1300°F (704°C)
- B. 1400°F (760°C)
- C. 1600°F (871°C)
- D. 1500°F (815°C)
Answer: D
Explanation:
According to API RP 571, under Oxidation:
"Austenitic stainless steels (300 Series) are generally used for oxidation resistance up to about 1500°F (815° C). At higher temperatures, scaling and loss of protective chromium oxide layers increase."
"Above these temperatures, specialized high-temperature alloys may be required." (Reference: API RP 571, Section 5.1.1 - Oxidation) Therefore, option C is the correct answer.
NEW QUESTION # 24
Thermal fatigue cracks usually propagate _______ to the stress and they are usually dagger-shaped.
- A. Across
- B. Transverse
- C. Parallel
- D. Diagonal
Answer: B
NEW QUESTION # 25
General or localized corrosion of carbon steels and other metals caused by dissolved salts, gases, organic compounds or microbiological activities is called ________.
- A. All of the Above
- B. None of the Above
- C. Flue Gas Corrosion
- D. Cooling Water Corrosion
- E. Atmospheric Corrosion
Answer: D
NEW QUESTION # 26
Corrosion of carbon steel and other alloys from their reaction with sulfur compounds in high temperature environments is called ______. The presence of hydrogen accelerates corrosion.
- A. Sulfidation
- B. Sulfide corrosion
- C. High temperature corrosion
- D. H2S corrosion
Answer: A
NEW QUESTION # 27
Which of the following weldments is most susceptible to dissimilar metal cracking when operating at high temperatures?
- A. Carbon steel to Inconel 625
- B. Carbon steel to Monel 400
- C. Carbon steel to 316 stainless steel
- D. Carbon steel to Incoloy 800
Answer: C
Explanation:
Dissimilar Metal Cracking (DMC) is a form of high-temperature cracking that frequently occurs in weld joints between carbon steel and austenitic stainless steel (such as Type 316 SS) due to differences in thermal expansion coefficients and mechanical properties.
From API RP 571 Section 5.2.3.1 (Dissimilar Metal Weld Cracking):
"Cracking frequently occurs in weld joints between ferritic and austenitic materials such as carbon steel to
300 series stainless steels due to thermal expansion mismatch during high temperature operation." Therefore, Option D (Carbon steel to 316 stainless steel) is the most susceptible combination and the correct answer.
NEW QUESTION # 28
Creep and stress rupture is more likely in a _________ grained material than a _______ grained material.
- A. Fine, Course
- B. None of the above
- C. Course, Fine
- D. Austenitic, Martensitic
Answer: C
NEW QUESTION # 29
PWHT is ___________ in preventing caustic SCC.
- A. Effective
- B. Not practical
- C. None of the above
- D. Not effective
Answer: A
NEW QUESTION # 30
Which API RP recommends programs to monitor small-bore piping, flange faces, blistering and HIC/SOHIC in HF alky units?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 31
Erosion-corrosion is a description for the damage that occurs when corrosion contributes to erosion by removing protective films or scales, or by exposing the metal surface to further ________ under the combined action of corrosion-erosion.
- A. Corrosion
- B. None of the above
- C. Oxidation
- D. Stress
Answer: A
NEW QUESTION # 32
Although the loss of toughness from temper embrittlement is not evident at operating temperatures, equipment that is temper embrittled may be susceptible to ________ during start-up and shutdown.
- A. Notch toughness
- B. Cyclic stress
- C. Thermal fatigue
- D. Brittle fracture
Answer: D
NEW QUESTION # 33
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