API-571

API-571 practice questions, page 18 of 18, with answer review and explanations.

Question 86

All ________ based materials and low alloy materials, 300 Series SS and 400 Series SS are susceptible to Sulfidation.

  1. Carbon
  2. Steel
  3. Chromium
  4. Iron

Question 87

Sulfuric acid promotes general and localized corrosion of carbon steel. Carbon steel heat affected zones may experience severe corrosion. Acid concentration, temperature, alloy content and ____________ are critical factors affecting sulfuric acid corrosion.

  1. Pressure
  2. Stress
  3. Velocity
  4. Ductility

Question 88

Which of these materials are susceptible to brittle fracture?

  1. Carbon steels
  2. Low alloy steels
  3. 400 Series SS
  4. All of the above

Question 89

____________ 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

Question 90

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