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API-571 Related Certifications, Reliable API-571 Study Notes
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Pass Guaranteed API-571 - Corrosion and Materials Professional Fantastic Related Certifications
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API Corrosion and Materials Professional Sample Questions (Q88-Q93):
NEW QUESTION # 88
Equipment that is temper embrittled may be susceptible to _______ during start-up and
shutdown.
- A. Brittle fracture
- B. Stress fatigue
- C. Creep
- D. Thermal fatigue
Answer: A
NEW QUESTION # 89
Boiler water condensate corrosion is caused primarily by:
- A. Sodium sulfites or hydrazines
- B. High pH from water treatment problems
- C. Dissolved iron oxides
- D. Carbon dioxide and oxygen
Answer: D
Explanation:
According to API RP 571, in the section on Boiler Water Condensate Corrosion:
"The major contributors to condensate corrosion are dissolved CO# and O#. Carbon dioxide forms carbonic acid in the presence of water, lowering pH and causing generalized corrosion."
"Oxygen causes pitting and localized corrosion unless chemically treated." Thus, option B (Carbon dioxide and oxygen) is the primary root cause and the correct answer.
NEW QUESTION # 90
In a wet H2S-type environment, what fluid material will significantly increase the probability of blistering?
- A. Polythionic acid
- B. Carbonates
- C. Amines
- D. Cyanides
Answer: D
Explanation:
According to API RP 571 Section 5.1.2.1 (Hydrogen-Induced Cracking) and Publ 939-A, blistering in carbon and low alloy steels exposed to wet H2S environments can be exacerbated by the presence of cyanides
. These accelerate hydrogen entry into steel, increasing the chance of hydrogen blistering.
* API RP 571 states:
"HIC and blistering are forms of hydrogen damage that occur in wet H2S environments. The presence of cyanides can significantly increase hydrogen entry and the risk of blistering."
* Publ 939-A (Research on Cracking in Wet H2S Service) also notes:
"Cyanides act as catalytic agents in hydrogen charging, which promotes internal pressure build-up and increases blistering." Thus, cyanides (Option B) are the most critical in enhancing blistering in H2S environments.
NEW QUESTION # 91
The loss in strength from spheroidization (Softening) is usually accompanied by a(n) _________ in ductility, which allows for deformation at stress concentrations.
- A. Yield
- B. Increase
- C. Reduction
- D. Decrease
Answer: B
NEW QUESTION # 92
The most important factors affecting graphitization are the chemistry, stress, temperature and _______.
- A. Time at exposure
- B. Ductility
- C. Velocity
- D. Pressure
Answer: A
NEW QUESTION # 93
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