Free API-571 Exam Braindumps (page: 40)

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Naphthenic acid corrosion is most severe in _________ flow; in areas of high velocity or turbulence and in distillation towers where hot vapors condense to form liquid phase droplets.

  1. Single phase
  2. Two phase
  3. Three phase
  4. Negative phase

Answer(s): B



Nitriding begins above ________ and becomes severe above _______.

  1. 500º F, 800º F
  2. 600º F, 900º F
  3. 800º F, 1000º F
  4. 700º F, 1100º F

Answer(s): B



In fired heater tubes, dissimilar weld metal cracking forms primarily on the _______ of the material.

  1. Outside
  2. Inside
  3. Welds
  4. All of the above

Answer(s): A



Which of these materials exhibit an endurance limit below which fatigue cracking will not occur?

  1. Carbon steel
  2. 300 Series SS
  3. 400 Series SS
  4. None of the above

Answer(s): A






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