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[General] API-571 Printable PDF - API Corrosion and Materials Professional - Valid Lab API

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【General】 API-571 Printable PDF - API Corrosion and Materials Professional - Valid Lab API

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API Corrosion and Materials Professional Sample Questions (Q72-Q77):NEW QUESTION # 72
If thermal shock damage may be present, which of the following should be checked?
  • A. Surface exfoliation of furnace tubes
  • B. Bulging at elbows
  • C. Hot/cold injection points
  • D. Hardness of the furnace outlet piping
Answer: C
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 # 73
All piping and equipment exposed to HF acid at any concentration with hardness levels above ________ are subject to hydrogen stress cracking.
  • A. 200 BHN
  • B. 210 BHN
  • C. 227 BHN
  • D. 237 BHN
Answer: D

NEW QUESTION # 74
NAC may be found in hot hydrocarbon streams downstream of the crude and vacuum units, __________ any hydrogen mix point.
  • A. Around
  • B. Adjacent to
  • C. Upstream of
  • D. Downstream of
Answer: C

NEW QUESTION # 75
Which of the materials listed are not susceptible to Chloride Stress Corrosion Cracking?
  • A. 300 Series Stainless Steel
  • B. 8% Nickel Alloys
  • C. Duplex Stainless Steel
  • D. 400 Series Stainless Steel
Answer: D
Explanation:
Chloride Stress Corrosion Cracking (Cl-SCC) is a serious form of corrosion primarily affecting austenitic stainless steels and some duplex stainless steels, particularly when exposed to chloride-containing environments at elevated temperatures.
According to API RP 571 Section 5.1.2.3 (Chloride Stress Corrosion Cracking - Cl-SCC):
"Austenitic stainless steels (e.g., 300 series such as Types 304 and 316) are the most susceptible to Cl-SCC...
Duplex stainless steels have greater resistance but are not immune, especially at temperatures >150°F (65° C)... Ferritic stainless steels (400 series) are generally not susceptible." Thus, Option A (400 Series Stainless Steel) is not susceptible to chloride SCC, making it the correct answer.

NEW QUESTION # 76
Sour water corrosion in _________ containing environments may be accompanied by carbonate SCC.
  • A. O²
  • B. H²O
  • C. H²S
  • D. CO²
Answer: D

NEW QUESTION # 77
......
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