Free API-571 Exam Braindumps (page: 46)

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___________ is the result of cyclic stresses caused by variations in temperature.

  1. Cyclic cracking
  2. Stress cracking
  3. Stress fatigue
  4. Thermal fatigue

Answer(s): D



Corrosion due to acidic sour water containing H²S at a pH between 4.5 and 7.0 is called sour water corrosion. Carbon dioxide (CO²) may also be present.
Which of the following materials is susceptible to sour water corrosion?

  1. Carbon steel
  2. 300 Series SS
  3. 400 Series SS
  4. Both B and C

Answer(s): A



________ of a component is the most important factor in determining a components resistance to mechanical fatigue.

  1. Design
  2. Temperature
  3. Stress
  4. Pressure

Answer(s): A



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?

  1. Low alloy steel
  2. Duplex SS
  3. Carbon steel
  4. None of the above

Answer(s): B






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