Free API-571 Exam Braindumps
Corrosion and Materials Professional Questions 161–165 (page: 34)

Updated On: 9-Feb-2026

Exposure to high solution strength caustic can result in general corrosion or high corrosion rates above ________.

  1. 175º F
  2. 150º F
  3. 125º F
  4. 100º F

Answer(s): B



Typical HF Alkylation units operate with 1% to 3% water in the acid, equivalent to an HF-in-water concentration of 97% to 99% and the temperatures are generally below _________.

  1. 300º F
  2. 250º F
  3. 200º F
  4. 150º F

Answer(s): D



With decarburization, the decarburized layer will be free of carbide phases. Carbon steel will be ______.

  1. Annealed
  2. Quenched
  3. Pure iron
  4. None of the above

Answer(s): C



What is the chemical symbol for ethane or ethylene?

  1. C²
  2. C3
  3. C4
  4. CH4

Answer(s): A



Naphthenic acid corrosion is a form of high temperature corrosion that occurs primarily in crude and vacuum units and downstream units that process certain fractions that contain naphthenic acid.
Which of the following materials is susceptible to naphthenic acid corrosion?

  1. Carbon steel
  2. 300 Series SS
  3. 400 Series SS
  4. All of the above

Answer(s): D



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