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API Corrosion and Materials API-571 Exam
API Corrosion and Materials API-571 Exam is related to Advanced Corrosion & Materials Professional Certifications. This exam validates the knowledge and skills of corrosion engineers, corrosion processes among specialized inspectors, chemical engineers and other professionals across the entire petrochemical industry. Highly Specialized Inspectors, Corrosion Engineers and Chemical Engineers usually hold or pursue this certification and you can expect the same job role after completion of this certification.
NEW QUESTION # 29
Carbon steel is susceptible to SCC when used in ___________ service.
- A. Ammonia
- B. Hydrogen
- C. High temperature
- D. High pressure
Answer: A
NEW QUESTION # 30
A loss in ductility of high strength steels due to the penetration of atomic hydrogen can lead to brittle cracking called hydrogen embrittlement. Which of the following materials is susceptible to HE.
- A. All of the above
- B. Carbon steel
- C. Low alloy steel
- D. 400 Series SS
Answer: A
NEW QUESTION # 31
The regenerator reboiler and the regenerator are areas where the temperature and __________ of the amine stream are the highest and can cause significant corrosion problems.
- A. Turbulence
- B. Concentration
- C. Pressure
- D. Stress
Answer: A
NEW QUESTION # 32
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. None of the above
- B. MADT
- C. Transition range
- D. Creep range
Answer: D
NEW QUESTION # 33
Cooling water corrosion and __________ are closely related and should be considered together.
- A. Erosion
- B. Fouling
- C. Stress
- D. Velocity
Answer: B
NEW QUESTION # 34
Cavitation is best prevented by avoiding conditions that allow the absolute pressure to fall below the ___________ of the liquid or by changing the material properties.
- A. Pressure/vapor ratio
- B. Minimum pressure
- C. Maximum pressure
- D. Vapor pressure
Answer: D
NEW QUESTION # 35
The regenerator reboiler and the regenerator are areas where the temperature and __________ of the amine stream are the highest and can cause significant corrosion problems.
- A. Turbulence
- B. Concentration
- C. Pressure
- D. Stress
Answer: A
NEW QUESTION # 36
________ injection downstream of the desalter is another common method used to reduce the amount of HCl going overhead.
- A. Hydrogen
- B. Water
- C. Caustic
- D. Nitrogen
Answer: C
NEW QUESTION # 37
A loss in ductility of high strength steels due to the penetration of atomic hydrogen can lead to brittle cracking called hydrogen embrittlement. Which of the following materials is susceptible to HE.
- A. All of the above
- B. Carbon steel
- C. Low alloy steel
- D. 400 Series SS
Answer: A
Explanation:
Explanation
NEW QUESTION # 38
The removal of surface material by impacting materials is called:
- A. Erosion
- B. Erosion or erosion corrosion
- C. IPC (imparting particle corrosion)
- D. Erosion corrosion
Answer: A
NEW QUESTION # 39
If thermal shock damage may be present, which of the following should be checked?
- A. Hot/cold injection points
- B. Bulging at elbows
- C. Hardness of the furnace outlet piping
- D. Surface exfoliation of furnace tubes
Answer: A
Explanation:
Under Thermal Fatigue and Shock, API RP 571 explains:
"Thermal shock damage often initiates at locations with sudden temperature changes, such as quench zones, cold/hot injection points, and areas subjected to rapid cycling."
"These are critical inspection points for detecting cracking from thermal shock." Thus, option B best matches the described mechanism.
NEW QUESTION # 40
Hardness is primarily an issue with SSC. Typical low strength carbon steels should be controlled to produce weld hardness less than ________.
- A. 200 BHN
- B. 240 BHN
- C. 225 BHN
- D. 237 BHN
Answer: A
NEW QUESTION # 41
Which of the following materials is not susceptible to high temperature hydrogen attack?
- A. All of the above
- B. 300 Series SS
- C. 9Cr-1Mo
- D. 5 Cr-1Mo
Answer: A
NEW QUESTION # 42
If weld repairs are required, the effects of temper embrittlement can be temporarily reversed (de-embrittled) by heating at ______ for 2 hours per inch of thickness and rapidly cooling to room temperature.
- A. 1250(o) F
- B. 1200(o) F
- C. 1000(o) F
- D. 1150(o) F
Answer: D
NEW QUESTION # 43
Cracks associated with brittle fracture will typically be _________.
- A. Branching
- B. Straight
- C. Jagged
- D. Perpendicular
Answer: B
NEW QUESTION # 44
For a specific material, HTHA is dependent on temperature, hydrogen partial pressure, time and
_________.
- A. Alloy composition
- B. Pressure
- C. Stress
- D. Velocity
Answer: C
NEW QUESTION # 45
______ is similar to HIC but is a potentially more damaging form of cracking which appears as arrays of cracks stacked on top of each other. The result is a through thickness crack that is perpendicular to the surface and is driven by high levels of stress.
- A. None of the above
- B. SOHIC
- C. Sulfuric SCC
- D. MIC
Answer: B
NEW QUESTION # 46
(Deaerators that have not been postweld heat-treated are commonly subject to:)
- A. Vibration-induced fatigue
- B. Caustic stress corrosion cracking
- C. Corrosion fatigue
- D. Steam blanketing
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Per API RP 571, deaerators often operate in environments where concentrated caustic solutions can form locally due to oxygen scavengers and water chemistry control additives.
When postweld heat treatment (PWHT) is not performed:
* High residual welding stresses remain
* Conditions are ideal for caustic stress corrosion cracking (Caustic SCC) API RP 571 identifies deaerators as classic examples of equipment that has experienced caustic SCC when PWHT was omitted.
Referenced Documents (Study Basis):
* API RP 571 - Section on Caustic Stress Corrosion Cracking
NEW QUESTION # 47
General or localized corrosion of carbon steels and other metals caused by dissolved salts, gases, organic compounds or microbiological activity is called _______.
- A. None of the above
- B. Oxidation
- C. Cooling water corrosion
- D. MIC
Answer: C
NEW QUESTION # 48
With creep, increased stress due to loss in thickness from corrosion will ________ time to failure.
- A. None of the above
- B. Not affect
- C. Reduce
- D. Increase
Answer: C
NEW QUESTION # 49
Cadmium and lead will cause LME on _____________.
- A. High strength steel
- B. 300 Series SS
- C. Aluminum alloys
- D. Copper alloys
Answer: A
NEW QUESTION # 50
Sulfidation usually creates:
- A. Intergranular cracking.
- B. Inspection nightmares.
- C. Uniform corrosion.
- D. Hard and brittle zones.
- E. Transgranular cracking.
- F. Isolated pitting.
Answer: C
NEW QUESTION # 51
Carbon steel is susceptible to SCC when used in ___________ service.
- A. Ammonia
- B. Hydrogen
- C. High temperature
- D. High pressure
Answer: A
NEW QUESTION # 52
____________ is the reduction in toughness due to a metallurgical change that can occur in some low alloy steels as a result of long-term exposure in the temperature range of about 650(o) F to 1100(o) F.
- A. Temper embrittlement
- B. Hardening
- C. Spheroidization
- D. Graphitization
Answer: A
NEW QUESTION # 53
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