API-571

API-571 practice questions, page 3 of 18, with answer review and explanations.

Question 11

________ has been a major problem on coke drum shells.

  1. Thermal fatigue
  2. Stress cracking
  3. Erosion
  4. Temper embrittlement

Question 12

Thermal fatigue cracks propagate ________ to the stress and are usually dagger shaped, transgranular and oxide-filled.

  1. Axial
  2. Diagonal
  3. Transverse
  4. Angular

Question 13

Inspection for wet H2S damage generally focuses on _____ and ______.

  1. Weld seams
  2. Nozzles
  3. Trays
  4. Down comers
  5. A and B

Question 14

________ is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles.

  1. Condensate corrosion
  2. Cavitation
  3. Dew-Point corrosion
  4. Atmospheric corrosion

Question 15

With CUI, corrosion rates __________ with increasing metal temperatures up to the point where the water evaporates quickly.

  1. Decrease
  2. Increase
  3. Stay the same
  4. None of the above