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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
How much API-571 Exam Cost
The price of the API-571 exam is $365 USD.
NEW QUESTION # 30
In pressure containing equipment, SOHIC and SCC damage is most often associated with __________.
- A. Weldments
- B. None of the above
- C. Internals
- D. Branches
Answer: A
NEW QUESTION # 31
With ammonia stress corrosion cracking weld hardness should not exceed _______ BHN.
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 32
The creep threshold temperature for carbon steel is ________.
- A. 371º C
- B. 538º C
- C. 315º C
- D. 426º C
Answer: A
NEW QUESTION # 33
The removal of surface material by impacting materials is called:
- A. Erosion or erosion corrosion
- B. Erosion corrosion
- C. IPC (imparting particle corrosion)
- D. Erosion
Answer: D
NEW QUESTION # 34
Units where graphitization may be suspected are the FCCU and the _____ unit.
- A. Alky
- B. Hydrotreater
- C. None of the above
- D. Coker
Answer: D
NEW QUESTION # 35
Permanent deformation occurring at relatively low stress levels as a result of localized overheating is called ________.
- A. Brittle fracture
- B. Temper embrittlement
- C. Stress rupture
- D. Stress cracking
Answer: C
NEW QUESTION # 36
(Amine stress corrosion cracking is found primarily in the:)
- A. Base metal
- B. Weld fusion line
- C. Weld heat affected zone
- D. Weld metal
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
According to API RP 571, amine stress corrosion cracking (Amine SCC) is a form of environmentally assisted cracking that occurs in alkanolamine systems (e.g., MEA, DEA, DGA) used for acid gas treating.
The cracking mechanism requires the simultaneous presence of tensile stress, susceptible microstructure, and an amine environment.
API RP 571 clearly states that Amine SCC occurs primarily in the weld heat affected zone (HAZ) of carbon and low-alloy steels. The reasons include:
* The HAZ contains high residual stresses from welding.
* The microstructure in the HAZ is metallurgically altered, making it more susceptible than base metal.
* Cracks often initiate adjacent to welds, not in the weld metal itself.
Why the other options are incorrect:
* Option A (Weld fusion line) is not the primary cracking location.
* Option C (Weld metal) generally has different chemistry and lower susceptibility.
* Option D (Base metal) typically has lower residual stress and is less prone.
API RP 571 specifically identifies the weld HAZ as the dominant cracking location for Amine SCC.
Referenced Documents (Study Basis):
* API RP 571 - Section on Amine Stress Corrosion Cracking
* API Corrosion and Materials Study Guide
NEW QUESTION # 37
Which of the following inspection methods should primarily be used to identify naphthenic acid corrosion (NAC) in a piping system?
- A. Radiographic testing followed by angle-beam ultrasonic testing
- B. Angle-beam ultrasonic testing
- C. Radiographic testing followed by ultrasonic measurements
- D. Eddy-current testing
Answer: C
Explanation:
API RP 571 on Naphthenic Acid Corrosion (NAC):
"NAC results in thinning, especially in areas of high velocity and turbulence. Standard UT or radiographic inspection followed by UT thickness monitoring is typically used to detect wall loss."
"Advanced techniques like angle-beam or eddy current are not typically required." So, option A correctly reflects the most effective and widely used method.
NEW QUESTION # 38
Corrosion rates of the anode can be high if there is a _______ anode to cathode ratio.
- A. None of the above
- B. Severe
- C. Large
- D. Small
Answer: D
NEW QUESTION # 39
The creep threshold temperature for 1 1/4, 2 1/4, 5 and 9 Cr is ________.
- A. 700º F
- B. 1000º F
- C. 600º F
- D. 800º F
Answer: D
NEW QUESTION # 40
Carbon dioxide (CO²) corrosion results when CO² dissolves in water to form ________.
- A. Carbon monoxide
- B. None of the above
- C. Carbonic acid
- D. Hydrofluoric acid
Answer: C
NEW QUESTION # 41
Metal dusting is preceded by ________ and is characterized by rapid metal wastage.
- A. Carburization
- B. None of the above
- C. Graphitization
- D. Decarburization
Answer: A
NEW QUESTION # 42
Increasing the chromium in steels offers no major improvement in resistance to CO² corrosion until a minimum of __________ is reached.
- A. 7%
- B. 12%
- C. 9%
- D. 5%
Answer: B
NEW QUESTION # 43
__________ is a change in the microstructure of certain carbon steels and 0.5 Mo steels after long term operation in the 800º F to 1100º F range.
- A. Graphitization
- B. Creep
- C. Softening
- D. Temper Embrittlement
Answer: A
NEW QUESTION # 44
Refractory lined equipment should be designed for erosion, thermal shock and __________.
- A. All of the above
- B. Thermal fatigue
- C. Thermal contraction
- D. Thermal expansion
Answer: D
NEW QUESTION # 45
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