Mar 13, 2026 PASS API API-571 EXAM WITH UPDATED DUMPS
API-571 Questions PDF [2026] Use Valid New dump to Clear Exam
What is the duration of the API-571 Exam
- Length of Examination: 3.25 hours
- Format: Multiple choices, multiple answers
- Number of Questions: 70
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NEW QUESTION # 24
What arbitrary value of hydrogen sulfide in water is often used as the defining concentration where cracking damage becomes a problem in carbon steel pipe?
- A. 1 ppmw
- B. 0.5%
- C. 50 ppmw
- D. 0.05%
Answer: C
Explanation:
As per API RP 571 and further clarified in API RP 939-C:
"An arbitrary threshold of 50 ppmw H#S in the aqueous phase is often used to define when carbon and low alloy steels become susceptible to cracking damage in wet H#S environments."
"Below this level, the risk of SSC, HIC, and SOHIC is considered lower, although damage has still occurred at lower concentrations depending on stress and metallurgical conditions." Therefore, the correct answer is option D (50 ppmw).
NEW QUESTION # 25
A 6", A106 Gr B, flanged line carrying caustic wash water at 200º F has signs of atmospheric corrosion.
Which of the following may have help accelerate the corrosion?
- A. Sulfides
- B. Fly ash
- C. Caustic
- D. None of the above
Answer: B
NEW QUESTION # 26
Generally, to minimize corrosion of carbon steel in hydrofluoric acid service, residual elements (Cr, Ni, Cu) should be less than:
- A. 0.15 wt.%
- B. 0.25 wt.%
- C. 0.18 wt.%
- D. 0.35 wt.%
Answer: A
Explanation:
API RP 751, which governs HF alkylation units, specifies:
"The total residuals of chromium, nickel, and copper in carbon steel used in HF service should be less than
0.15 wt.% to minimize corrosion risk."
"Higher residuals increase the reactivity and corrosion rate of carbon steel in the presence of HF acid." (Reference: API RP 751, Section 5.3 - Materials Specification for HF Units) Therefore, option A is the correct choice.
NEW QUESTION # 27
When caustic stress corrosion cracking is a concern, steam out of _________ carbon steel piping and equipment should be avoided.
- A. Non-PWHT
- B. Hardened
- C. Ferritic
- D. PWHT
Answer: A
NEW QUESTION # 28
Which of the following damage mechanisms are most closely related because they occur in similar environments?
- A. Fuel ash corrosion and flue gas dew-point corrosion
- B. Oxidation and sulfidation
- C. Carburization and metal dusting
- D. Carbonate corrosion and CO# corrosion
Answer: B
Explanation:
According to API RP 571:
"Oxidation is the reaction of metal and oxygen to form oxides. It generally occurs in high temperature environments with excess oxygen."
"Sulfidation is a high temperature corrosion mechanism that occurs due to interaction between sulfur- containing compounds and metal surfaces, forming metal sulfides. Like oxidation, sulfidation occurs in environments above 500 °F (260 °C)."
"Both oxidation and sulfidation can occur concurrently, particularly in mixed environments of oxygen and sulfur." (Reference: API RP 571, Sections 5.1.1 and 5.1.3 - Oxidation & Sulfidation) These two mechanisms are thermally activated and occur in elevated temperature conditions found in heaters, furnaces, and piping systems. Hence, option B is correct.
NEW QUESTION # 29
Creep damage is found in high temperature equipment operating above the ________. Fired heater tubes and components, Catalytic reactors, FCC reactors and FCC fractionator and regenerator internals all operate in or near this.
- A. MADT
- B. Transition range
- C. Creep range
- D. None of the above
Answer: C
NEW QUESTION # 30
_____________ usually occurs when a colder liquid contacts a warmer metal surface.
- A. Stress rupture
- B. Thermal fatigue
- C. Thermal shock
- D. Brittle fracture
Answer: C
NEW QUESTION # 31
__________ testing is the best method to determine the susceptibility of a material to hydrogen stress cracking.
- A. Hardness
- B. Acoustic
- C. SWUT
- D. AUT
Answer: A
NEW QUESTION # 32
With decarburization, the decarburized layer will be free of carbide phases. Carbon steel will be ______.
- A. Pure iron
- B. Quenched
- C. Annealed
- D. None of the above
Answer: A
NEW QUESTION # 33
Fatigue cracks usually initiate on the surface at notches or __________ under cyclic loading.
- A. Grinding marks
- B. Stress concentrations
- C. Branches
- D. Laterals
Answer: B
NEW QUESTION # 34
With sour water corrosion, streams with a pH below ________ indicate the presence of a strong acid.
- A. 6.0
- B. 5.5
- C. 7.0
- D. 4.5
Answer: D
NEW QUESTION # 35
Short term overheating is a permanent deformation occurring at relatively _________ stress levels as a result of localized overheating. This usually results in bulging and failure by stress rupture.
- A. Even
- B. High
- C. Low
- D. None of the above
Answer: C
NEW QUESTION # 36
Resistance to sulfidation increases as the:
- A. Nickel content in the material increases.
- B. Chromium content in the material increases.
- C. Material's tensile strength increases.
- D. Material's tensile strength decreases.
Answer: B
NEW QUESTION # 37
Type 304L SS is satisfactory for phosphoric acid concentration of 100% up to about _________. Type 321 is required from there to 225º F.
- A. 150º F
- B. 120º F
- C. 100º F
- D. 140º F
Answer: B
NEW QUESTION # 38
The level of creep damage is a function of the material and the coincident _________ level at which the creep deformation occurs.
- A. Pressure/Temperature
- B. Pressure/Stress
- C. Temperature/Stress
- D. None of the above
Answer: C
NEW QUESTION # 39
Sulfide stress cracking (SSC) is defined as cracking of metal under the combined action of tensile stress and corrosion in the presence of _________ and _________.
- A. Sulfur, Oxide
- B. Water, H(2)S
- C. Hydrogen, water
- D. H(2)S, Oxygen
Answer: B
NEW QUESTION # 40
Annealed steels are more resistant to Spheroidization than normalized steels. _________ grained steels are more resistant than ______ grained steels.
- A. Course, Fine
- B. Fine, Course
- C. PWHT, Non-PWHT
- D. Non-PWHT, PWHT
Answer: A
NEW QUESTION # 41
The best way to prevent 885(o) F embrittlement is to use low ________ alloys, or to avoid exposing the susceptible material to the embrittling range.
- A. Austenite
- B. Ferrite
- C. Martensite
- D. Chromium
Answer: B
NEW QUESTION # 42
At high temperatures, metal components can slowly and continuously deform under load below the yield strength. This time dependent deformation of stressed components is known as _______?
- A. Hardening
- B. Ductility
- C. Softening
- D. Creep
Answer: D
NEW QUESTION # 43
300 Series SS can be used for sour water service at temperatures below ____________, where Chloride SCC is not likely.
- A. 175(o) F
- B. 120(o) F
- C. 150(o) F
- D. 140(o) F
Answer: D
NEW QUESTION # 44
Amine corrosion refers to the general and/or localized corrosion that occurs principally on
_________ in amine treating processes. Corrosion is not caused by the amine itself, but results from dissolved acid gases (CO(2) and H(2)S), amine degradation products, heat stable amine salts and other contaminants.
- A. 400 Series SS
- B. Carbon steel
- C. Duplex SS
- D. 300 Series SS
Answer: B
NEW QUESTION # 45
High temperature H² / H²S corrosion damage is minimized by using alloys with high _________ content.
- A. Chromium
- B. Carbon
- C. Molybdenum
- D. Stainless
Answer: A
NEW QUESTION # 46
A form of fatigue cracking in which cracks develop under the combined effects of cyclic loading and corrosion is called _______. Cracking often initiates at stress concentrations such as a pit in the surface.
- A. Stress cracking
- B. Cyclic cracking
- C. Corrosion fatigue
- D. Stress fatigue
Answer: C
NEW QUESTION # 47
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