API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 311:

  The stream from a crude atmospheric overhead goes to the tube side of a shell-and-tube condenser with a temperature of 300癋 (149癈) and a pressure of 10 psig (69 kPa). As the stream begins to condense water, its hydrochloric acid content lowers the water pH to about 4.0. Which of the following would be the best alloy selection for the tubes with cooling water on the shell side?

  A. 410 Stainless Steel
  B. Titanium
  C. 9 Cr-1 Mo Steel
  D. 316 Stainless Steel
  B. Titanium

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  API RP 571 notes in the context of Hydrochloric Acid Corrosion in overhead condensers: "Titanium is highly resistant to low pH acidic aqueous phases, including hydrochloric acid formed during condensation in overhead systems."

  "Stainless steels like 316 and 410 are not suitable in the presence of free chlorides at low pH and elevated

  temperatures."

  API RP 571, Section 4.3.3.3 - Hydrochloric Acid Corrosion)

  Thus, Titanium is the preferred alloy under the described acidic and high-temperature conditions, making option B correct.

• Question 312:

  Which of the following materials are generally not suitable for HF service?

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

• Question 313:

  Which of the following materials is susceptible to sigma phase embrittlement?

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

• Question 314:

  Which API RP recommends programs to monitor small-bore piping, flange faces, blistering and HIC/SOHIC in HF alky units?

  A. 574
  B. 751
  C. 571
  D. 980
  B. 751

• Question 315:

  With chloride stress corrosion cracking, __________ temperatures ________ the susceptibility for cracking.

  A. Decreasing, Increases
  B. Increasing, Increases
  C. Increasing, Decreases
  D. Decreasing, Eliminates
  B. Increasing, Increases

• Question 316:

  The most common method used for monitoring underground structures is measuring the structure to soil ______ using dedicated reference electrodes near the structure.

  A. Resistivity
  B. Corrosiveness
  C. Potential
  D. Electrolyte
  C. Potential

• Question 317:

  Cracking of dissimilar weld metals occurs in the __________ side of a weld joining 300 Series SS and carbon steel.

  A. Austenitic
  B. Ferritic
  C. Both of the above
  D. None of the above
  B. Ferritic

• Question 318:

  Surface initiated cracks caused by environmental cracking of 300 Series SS and some nickel based alloys under the combined action of tensile stress, temperature and an aqueous chloride environmental is called ________. The presence of dissolved oxygen ___________ the propensity for cracking.

  A. Cl SCC, Increases
  B. Stress cracking, Increases
  C. Cl SCC, Decreases
  D. Stress cracking, Decreases
  A. Cl SCC, Increases

• Question 319:

  Which of the following materials is not susceptible to Cl SCC?

  A. 400 Series SS
  B. Duplex SS
  C. Nickel based alloys
  D. All of the above
  A. 400 Series SS

• Question 320:

  Low creep ductility is _____ prevalent at the lower temperatures in the creep range. Or low stresses in the upper creep range.

  A. More
  B. Less
  C. Equally
  D. None of the above
  A. More