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Free API-571 Exam Braindumps (page: 13)

Page 12 of 114
PDF with 454 Questions

Hydrogen blisters may form as surface bulges on the ID, the OD on within the wall thickness of a pipe or pressure vessel. Blistering occurs from hydrogen generated by ______, not hydrogen gas from the process stream.

  1. H²S
  2. Corrosion
  3. Hydriding
  4. Sulfur

Answer(s): B



Since all fuels contain some amount of sulfur, sulfuric and sulfurous acid __________ can occur if the metal temperature is below this temperature.

  1. Corrosion
  2. Pitting
  3. Dew point corrosion
  4. All of the above

Answer(s): C



The best way to prevent 885º F embrittlement is to use low ________ alloys, or to avoid exposing the susceptible material to the embrittling range.

  1. Austenite
  2. Martensite
  3. Ferrite
  4. Chromium

Answer(s): C



The amplitude and frequency of vibration as well as the _________ of the components are critical factors in vibration-induced fatigue.

  1. Velocity
  2. Temperature
  3. Fatigue resistance
  4. Material properties

Answer(s): C






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