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Free API-571 Exam Braindumps (page: 24)

Page 23 of 114
PDF with 454 Questions

____________ is a form of environmental cracking that can initiate on the surface of high strength low alloy steels and carbon steels with highly localized zones of high hardness in the weld metal and HAZ as a result of exposure to aqueous HF acid service.

  1. Sulfide stress cracking
  2. Hydrogen stress cracking
  3. Caustic stress cracking
  4. Hydrogen induced cracking

Answer(s): B



HCL acid corrosion is found in several units, especially _______ and ________, units, hydroprocessing units and catalytic reformer units.

  1. Amine, crude
  2. Crude, Alkylation
  3. Vacuum, Amine
  4. Crude, Vacuum

Answer(s): D



Cracking can occur at low caustic levels if a concentrating mechanism is present. In such cases, caustic concentrations of ________ ppm are sufficient to cause cracking.

  1. 50-100
  2. 100-150
  3. 150-200
  4. 200-250

Answer(s): A



Which of these materials is susceptible to 885º F embrittlement?

  1. 400 Series SS
  2. Duplex SS
  3. 5Cr-1Mo
  4. Both A and B

Answer(s): D






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