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Free API-571 Exam Braindumps (page: 20)

Page 19 of 114
PDF with 454 Questions

Hydrochloric acid corrosion is a general and localized corrosion and is very aggressive to most common materials of construction. Damage in refineries is often associated with dew point corrosion in which vapors containing _______ and hydrogen chloride condense from the overhead stream of a distillation, fractionation, or stripping tower.

  1. O²
  2. O
  3. H²O
  4. CO²

Answer(s): C



When connected to a more anodic material, titanium may suffer severe __________.

  1. Corrosion
  2. Hydriding
  3. Stress
  4. Notch toughness

Answer(s): B



__________ is a form of stress corrosion cracking normally occurring during shutdowns, startups or during operation when air and moisture are present. Cracking is due to sulfur acids forming from sulfide scale, air and moisture acting on sensitized stainless steel.

  1. Caustic SCC
  2. Chloride SCC
  3. Polythionic acid SCC
  4. None of the above

Answer(s): C



________ usually occurs when a colder liquid contacts a warmer metal surface.

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

Answer(s): C






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