API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 281:

  _________ of the amine system is the most effective way to prevent amine corrosion.

  A. Proper concentration
  B. Proper operation
  C. Proper design
  D. Proper startup
  B. Proper operation

• Question 282:

  Lean amine is generally not corrosive because they have either low conductivity and/or high pH. Corrosion rates increase with increasing temperatures, particularly in rich amine service. Temperatures above _________ can result in acid gas flashing and severe localized corrosion.

  A. 170?F
  B. 190?F
  C. 220?F
  D. 240?F
  C. 220?F

• Question 283:

  Which of the following can cause hydrogen embrittlement of carbon steel?

  A. High-temperature hydrogen attack (HTHA)
  B. Cleaning and pickling in caustic solutions
  C. Welding with wet electrodes
  D. Improper postweld heat treatment (PWHT)
  D. Improper postweld heat treatment (PWHT)

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  API RP 571 defines Hydrogen Embrittlement as:

  "Improper PWHT can trap hydrogen within the microstructure of carbon steel or fail to relieve residual stresses, both of which increase the risk of hydrogen embrittlement." "Moisture in electrodes contributes to hydrogen-induced cracking, but embrittlement from atomic hydrogen is more directly tied to heat treatment and microstructure." Thus, option D is the most accurate.

• Question 284:

  Amine corrosion refers to the general and/or localized corrosion that occurs principally on _________ in amine treating processes. Corrosion is not caused by the amine itself, but results from dissolved acid gases (CO?and H睸), amine degradation products, heat stable amine salts and other contaminants.

  A. Carbon steel
  B. Duplex SS
  C. 300 Series SS
  D. 400 Series SS
  A. Carbon steel

• Question 285:

  A form of fatigue cracking in which cracks develop under the combined effects of cyclic loading and corrosion is called _______. Cracking often initiates at stress concentrations such as a pit in the surface.

  A. Cyclic cracking
  B. Corrosion fatigue
  C. Stress fatigue
  D. Stress cracking
  B. Corrosion fatigue

• Question 286:

  Which of the following is the most significant result of spheroidization in steels?

  A. Increased potential for stress corrosion cracking
  B. Increased hardness
  C. Loss of ductility
  D. Loss of strength
  D. Loss of strength

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  As per API RP 571 Section 5.3.2.3 (Spheroidization): "Spheroidization is the transformation of the microstructure of steels into spherical carbides, leading to reduced strength and hardness, especially after extended high-temperature exposure. It's commonly seen in carbon and low alloy steels in refining heaters and reactors." It reduces strength and sometimes hardness. It increases ductility, not reduces. SCC potential is not directly tied to this change. Therefore, Option D (Loss of strength) is correct.

• Question 287:

  Cavitation is a form of erosion caused by the formation and instantaneous collapse of innumerable tiny vapor bubbles. Temperatures approaching the boiling point of the liquid are _________ to result in bubble formation.

  A. Less likely
  B. More likely
  C. Not likely
  D. None of the above
  B. More likely

• Question 288:

  Inspection for wet H2S damage generally focuses on _____ and ______.

  A. Weld seams
  B. Nozzles
  C. Trays
  D. Down comers
  E. A and B
  E. A and B

• Question 289:

  _________ is the sudden rapid fracture under stress (residual or applied) where the material exhibits little or no evidence of ductility or plastic deformation.

  A. Thermal fatigue
  B. Thermal shock C. Brittle fracture
  D. Stress fracture
  C

• Question 290:

  Application of a post-fabrication stress relieving heat treatment of about ______ is a proven method of preventing carbonate cracking.

  A. 1100?F
  B. 1150?F
  C. 1200?F
  D. 1250?F
  B. 1150?F