API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 451:

  The most effective mitigation for amine stress corrosion cracking is:

  A. Post-weld heat treatment
  B. Operating below 140癋 (60癈)
  C. Adding 0.2% water to the amine solution
  D. Changing amine solution concentration
  A. Post-weld heat treatment

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  As per API RP 945 (4th Edition, 2022): "Post-weld heat treatment (PWHT) is the most effective method for reducing residual stresses that contribute to amine SCC. PWHT minimizes the stress intensity required for crack initiation and growth." Lowering temperature helps but is not always feasible. Water content and amine concentration affect SCC but are not as impactful as PWHT. Thus, Option A (Post-weld heat treatment) is the most effective mitigation.

• Question 452:

  With sour water corrosion, streams with a pH below ________ indicate the presence of a strong acid.

  A. 7.0
  B. 5.5
  C. 6.0
  D. 4.5
  D. 4.5

• Question 453:

  300 Series SS can suffer pitting corrosion, crevice corrosion and ________ in fresh, blackish and salt water.

  A. General corrosion
  B. Oxidation
  C. SCC
  D. None of the above
  C. SCC

• Question 454:

  In pressure containing equipment, SOHIC and SCC damage is most often associated with __________.

  A. Internals
  B. Weldments
  C. Branches
  D. None of the above
  B. Weldments

• Question 455:

  Corrosion rates of the anode can be high if there is a _______ anode to cathode ratio.

  A. Large
  B. Small
  C. Severe
  D. None of the above
  B. Small

• Question 456:

  Galvanized steel components should not be welded to ________ due to LME.

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

• Question 457:

  The primary factors affecting high temperature oxidation are metal temperature and _______.

  A. Pressure
  B. Alloy composition
  C. Stress
  D. Oxygen
  B. Alloy composition

• Question 458:

  ________ and _______ damage develop without applied or residual stress so that PWHT will not prevent them from occurring.

  A. SOHIC, Blistering
  B. SCC, SOHIC
  C. HIC, SCC
  D. Blistering, HIC
  D. Blistering, HIC

• Question 459:

  Which of these materials is not susceptible to amine cracking?

  A. Carbon steel
  B. 300 Series SS
  C. 400 Series SS
  D. Both B and C
  D. Both B and C

• Question 460:

  Conditions favoring carburization include a high gas phase carbon activity and _______ oxygen potential.

  A. Low
  B. High
  C. Negative
  D. Positive
  A. Low