2026 New API-571 Dumps - Real API Exam Questions
Dependable API-571 Exam Dumps to Become API Certified
API API-571 Exam Syllabus Topics:
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NEW QUESTION # 10
Which of the following materials are subject to mechanical fatigue?
- A. Carbon steels
- B. Stainless steels
- C. Low alloy steels
- D. All of the above
Answer: D
NEW QUESTION # 11
Which of the following alkanolamine systems is the most aggressive in causing amine corrosion?
- A. Methyldiethanolamine (MDEA)
- B. Diglycolamine (DGA)
- C. Monoethanolamine (MEA)
- D. Diethanolamine (DEA)
Answer: C
NEW QUESTION # 12
In design and fabrication, it is advisable to avoid sharp changes in cross section, such as short radius fillets or undercut that can give rise to _________.
Long-seam welds are particularly susceptible to reheat cracking due to mismatch caused by fit up problems.
- A. All of the above
- B. Stress concentrations
- C. Circumferential stress
- D. Cracking
Answer: B
NEW QUESTION # 13
Corrosion from oxygen tends to be __________ type damage and can show up anywhere even if only very small amounts break through the scavenging system.
- A. Pitting
- B. Cracking
- C. Localized
- D. General
Answer: A
NEW QUESTION # 14
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 # 15
Stress relief and stabilization heat treatment of 300 Series SS for maximizing chloride SCC and PASCC resistance can cause ____________ problems, especially in thicker sections.
- A. Hydrogen
- B. HIC
- C. Reheat cracking
- D. Thermal fatigue
Answer: C
NEW QUESTION # 16
Dew point corrosion can occur if the metal temperature is below the dew point. The dew point of sulfuric acid is __________.
- A. 220(o) F
- B. 280(o) F
- C. 190(o) F
- D. 310(o) F
Answer: B
NEW QUESTION # 17
Which of the following metals is the most anodic?
- A. Nickel
- B. Carbon Steel
- C. Zinc
- D. Monel
Answer: C
NEW QUESTION # 18
(What nondestructive examination (NDE) technique requires the least amount of surface preparation to locate wet H#S damage mechanisms?)
- A. ACFM
- B. WFMT
- C. SWUT
- D. LPT
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Wet H#S damage mechanisms include hydrogen blistering, hydrogen-induced cracking (HIC), stepwise cracking (SWC), and stress-oriented hydrogen-induced cracking (SOHIC). These mechanisms are primarily internal and subsurface, as described in API RP 571.
Shear Wave Ultrasonic Testing (SWUT) is specifically highlighted in API RP 571 as a preferred screening and detection method for wet H#S damage because it can detect subsurface planar defects with minimal surface preparation. Typically, only basic coupling and access are required.
Why the other options are incorrect:
* Option A (ACFM) is a surface crack detection technique and requires relatively clean surfaces; it is not suitable for subsurface hydrogen damage.
* Option C (WFMT - Wet Fluorescent Magnetic Particle Testing) requires extensive surface preparation, coating removal, and direct access to the surface, and only detects surface-breaking flaws.
* Option D (LPT - Liquid Penetrant Testing) also requires clean, bare metal surfaces and cannot detect subsurface damage.
API RP 571 explicitly notes that ultrasonic techniques, particularly shear wave UT, are widely used for detecting internal hydrogen-related cracking with minimal disruption and surface preparation, making it the most effective choice for wet H#S damage screening.
Referenced Documents (Study Basis):
* API RP 571 - Section on Wet H#S Damage (HIC, SOHIC, Blistering)
* API Corrosion and Materials Inspection Study Guide
NEW QUESTION # 19
In general, the resistance of carbon steel and other alloys to High temperature corrosion is determined by the ________ content of the material.
- A. Molybdenum
- B. Carbon
- C. All of the above
- D. Chromium
Answer: D
NEW QUESTION # 20
For galvanic corrosion to take place, three conditions must be met, presence of an electrolyte, two different materials or alloys and ___________.
- A. An electrical connection
- B. An anode
- C. None of the above
- D. A cathode
Answer: A
NEW QUESTION # 21
Amine stress corrosion cracking is a term applied to the cracking of steels under the combined actions of ________ and __________ in aqueous alkanolamine systems used to remove/absorb H²S and/or CO² and their mixtures from various gas and liquid hydrocarbon streams.
- A. Tensile stress, corrosion
- B. Temperature, pressure
- C. Pressure, stress
- D. Temperature, corrosion
Answer: A
NEW QUESTION # 22
A condition where steel loses strength due to the removal of carbon and carbides leaving only an iron matrix is called decarburization. This occurs during high temperatures, during PWHT and from exposure to fires. Which of the following materials is not affected by this?
- A. Duplex SS
- B. Low alloy steel
- C. None of the above
- D. Carbon steel
Answer: A
NEW QUESTION # 23
What alloy element most improves naphthenic acid corrosion (NAC) resistance?
- A. Molybdenum
- B. Nickel
- C. Chromium
- D. Niobium
Answer: A
Explanation:
API RP 571, Naphthenic Acid Corrosion:
"Molybdenum significantly improves resistance to naphthenic acid attack. Alloys such as 317, 316Mo, and Alloy 20 are used in severe NAC environments due to higher Mo content."
"Chromium and nickel play secondary roles; molybdenum is the key element." Answer is A - Molybdenum.
NEW QUESTION # 24
________ is a form of carbon that may promote carburization, particularly during decoke cycles where temperatures exceed the normal operating temperatures.
- A. Coke
- B. Crude oil
- C. None of the above
- D. Carbonic acid
Answer: A
NEW QUESTION # 25
A 6", A106 Gr B, flanged line carrying caustic wash water at 200(o) F has signs of atmospheric corrosion. Which of the following may have help accelerate the corrosion?
- A. Fly ash
- B. Sulfides
- C. Caustic
- D. None of the above
Answer: A
NEW QUESTION # 26
With high temperature sulfide corrosion (Sulfidation), noticeable increases may be found downstream of
_________ injection points.
- A. Hydrogen
- B. Ammonia
- C. Water
- D. Caustic
Answer: A
NEW QUESTION # 27
Hydrogen stress cracking is the same mechanism that is responsible for sulfide stress corrosion cracking in wet H²S environments except that HF acid is generating the __________.
- A. Hydrogen
- B. Corrosion
- C. None of the above
- D. Sulfide
Answer: A
NEW QUESTION # 28
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