API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 101:

  Preventative measures to minimize the potential for brittle fracture in existing equipment are limited to controlling _______ and ________, minimizing pressure at ambient temperatures during start-up and shutdown and periodic inspections at high stress locations.

  A. Temperature, stress
  B. Stress, pressure
  C. Velocity, stress
  D. Temperature, Pressure
  D. Temperature, Pressure

• Question 102:

  What is the most effective way to mitigate aqueous organic acid corrosion in overhead streams?

  A. Increase the overhead temperature
  B. Water washing
  C. Injection of neutralizer
  D. Injection of filming amine
  C. Injection of neutralizer

  ---

  API RP 571 on Organic Acid Corrosion in Overheads explains:

  "Corrosion caused by organic acids (e.g., formic, acetic) in overhead systems is best mitigated by

  neutralization, usually via injection of alkaline neutralizing amines that raise pH and reduce acidity."

  "Water wash can be helpful but is often insufficient by itself."

  Therefore, the most effective approach is option C - injection of neutralizer .

• Question 103:

  Thermal fatigue cracks usually initiate on the _________ of the component. They are generally wide and filled with oxides due to the elevated temperatures.

  A. Surface
  B. ID
  C. Welds
  D. None of the above
  A. Surface

• Question 104:

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

  A. 400 Series SS
  B. Duplex SS
  C. 5Cr-1Mo
  D. Both A and B
  D. Both A and B

• Question 105:

  Sulfidation is primarily caused by ________ and other reactive sulfur species as a result of the thermal decomposition of sulfur compounds at high temperatures.

  A. Sulfur dioxide
  B. H睸
  C. Sulfur trioxide
  D. Sulfates
  B. H睸

• Question 106:

  The more noble material, called the ________, is protected by sacrificial corrosion of the more active material, called the ________. The more active metal corrodes at a higher rate than it would if it were not connected to the more noble metal.

  A. Anode, Cathode
  B. Cathode, Anode
  C. Alpha, Omega
  D. None of the above
  B. Cathode, Anode

• Question 107:

  Convection section soot blowers that have steam supplies without a steam trap can cause:

  A. CO2 corrosion.
  B. carbonic acid corrosion.
  C. thermal fatigue.
  D. condensate corrosion.
  D. condensate corrosion.

  ---

  In steam systems, the absence of a steam trap allows condensate to accumulate, which can lead to corrosion

  from oxygen and carbon dioxide dissolved in the water--a classic case of condensate corrosion.

  From API RP 571 Section 5.3.3.1 (Condensate Corrosion):

  "If steam lines or equipment like soot blowers do not have proper drainage or steam traps, condensate may accumulate... Corrosion results from the presence of dissolved oxygen and/or carbon dioxide in the

  condensate."

  Thus, the correct answer is Option D (condensate corrosion).

• Question 108:

  Sulfidation of iron-based alloys usually begins at metal temperatures above _____.

  A. 500?F
  B. 600?F
  C. 800?F
  D. 1000?F
  A. 500?F

• Question 109:

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

  A. Amine, crude
  B. Crude, Alkylation
  C. Vacuum, Amine
  D. Crude, Vacuum
  D. Crude, Vacuum

• Question 110:

  Hydrogen stress cracking is the same mechanism that is responsible for sulfide stress corrosion cracking in wet H睸 environments except that HF acid is generating the __________.

  A. Sulfide
  B. Corrosion
  C. Hydrogen
  D. None of the above
  C. Hydrogen