API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 491:

  Naphthenic acid corrosion is most severe in _________ flow; in areas of high velocity or turbulence and in distillation towers where hot vapors condense to form liquid phase droplets.

  A. Single phase
  B. Two phase
  C. Three phase
  D. Negative phase
  B. Two phase

• Question 492:

  Cracks that are typically straight, non-branching, and devoid of any associated plastic deformation are likely associated with which type of failure?

  A. Stress corrosion cracking
  B. Brittle fracture
  C. Thermal fatigue
  D. Temper embrittlement
  B. Brittle fracture

• Question 493:

  SCC generally occurs below about _______.

  A. 150?F
  B. 180?F
  C. 210?F
  D. 240?F
  B. 180?F

• Question 494:

  Which of the following materials are subject to mechanical fatigue?

  A. Carbon steels
  B. Stainless steels
  C. Low alloy steels
  D. All of the above
  D. All of the above

• Question 495:

  Corrosion from oxygen tends to be __________ type damage and can show up anywhere even if only very small amounts break through the scavenging system.

  A. General
  B. Localized
  C. Pitting
  D. Cracking
  C. Pitting

• Question 496:

  Corrosion under insulation is more severe between ________ and ____________.

  A. 175?F, 212?F
  B. 212?F, 250?F
  C. 250?F, 300?F
  D. 25?F, 250?F
  B. 212?F, 250?F

• Question 497:

  Damage from oxidation is usually determined by:

  A. Metallographic examination
  B. Ultrasonic thickness measurements
  C. Hardness testing
  D. Hammer testing
  B. Ultrasonic thickness measurements

  ---

  API RP 571 on Oxidation indicates:

  "Oxidation is a surface loss phenomenon that generally results in uniform thinning. Ultrasonic thickness

  measurements are typically used to monitor metal loss in oxidizing environments."

  "Metallography may be used to confirm oxide scale structure but is not necessary for routine evaluation."

  Hence, option B is the most appropriate standard method.

• Question 498:

  Cracking of dissimilar weld metals occurs on the _________ side of a weld between an austenitic and a Ferritic material operating at high temperatures.

  A. Austenitic
  B. Ferritic
  C. Anodic
  D. Cathodic
  B. Ferritic

• Question 499:

  Amine stress corrosion cracking is most often associated with lean amine services. The pure alkanolamine does not cause cracking. Cracking in rich amine services are most often associated with _______ problems.

  A. H睸
  B. Stress
  C. Wet H睸
  D. Temperature
  C. Wet H睸

• Question 500:

  Which of the following is not a prime candidate for thermal fatigue?

  A. Coke drums
  B. Steam actuated soot blowers
  C. Mix points of hot and cold streams
  D. 600 psig steam piping
  E. Welds joining materials having different coefficients of expansion
  D. 600 psig steam piping