API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 51:

  Resistance to sulfidation increases as the:

  A. Chromium content in the material increases.
  B. Nickel content in the material increases.
  C. Material's tensile strength decreases.
  D. Material's tensile strength increases.
  A. Chromium content in the material increases.

• Question 52:

  The major factors affecting high temperature sulfidation are the temperature, the presence of hydrogen, the concentration of H and the __________.

  A. Alloy content
  B. Velocity
  C. Pressure
  D. Water content
  A. Alloy content

• Question 53:

  The best way to prevent failures by atmospheric corrosion is to:

  A. Have an aggressive inspection program.
  B. Reduce airborne particulates.
  C. Install and maintain appropriate coatings.
  D. Shoot all birds that cross the plant fence.
  E. Build new petrochemical facilities in a dry desert.
  C. Install and maintain appropriate coatings.

• Question 54:

  With ammonia stress corrosion cracking weld hardness should not exceed _______ BHN.

  A. 237
  B. 225
  C. 235
  D. 218
  B. 225

• Question 55:

  A quick test for embrittlement from _________ is a bend test or crush test. Unaffected material will be crushed in a ductile fashion while embrittled components will crack with no signs of ductility.

  A. Titanium Hydriding
  B. Temper embrittlement
  C. Caustic embrittlement
  D. None of the above.
  A. Titanium Hydriding

• Question 56:

  What method is most used to assure boiler feed water corrosion is not occurring?

  A. Spot UT readings at turbulent areas
  B. Profile RT at turbulent areas
  C. Profile RT at stagnant areas
  D. Laboratory analysis of boiler feedwater
  D. Laboratory analysis of boiler feedwater

• Question 57:

  Amine units are used in refineries to remove H睸, CO?and _________ from process streams originating in many units including the coker, crude, FCC and hydrogen.

  A. NA?
  B. Cl?
  C. Mercaptans
  D. None of the above
  C. Mercaptans

• Question 58:

  Phosphoric acid corrosion in polymerization units is usually found under what circumstances?

  A. Turbulent flows
  B. Low velocity areas
  C. Two-phase flow
  D. When the acid dries out
  D. When the acid dries out

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  API RP 571 states under the section Phosphoric Acid Corrosion:

  "Corrosion usually occurs when the acid dries out and forms concentrated phosphoric acid deposits, which are very aggressive to carbon steel." "Drying or concentration occurs due to poor flow distribution or operational upsets. Localized areas may experience acid concentration due to vaporization."

  API RP 571, Section 4.3.3.8 - Phosphoric Acid Corrosion)

  Therefore, the most aggressive corrosion occurs when the acid dries out, making option D correct.

• Question 59:

  Cooling water corrosion can result in many different forms of damage including general corrosion, pitting corrosion, ________, stress corrosion cracking and fouling.

  A. MIC
  B. HIC
  C. SOHIC
  D. All of the above
  A. MIC

• Question 60:

  Protection in a boiler from boiler feed water corrosion is accomplished by:

  A. Injecting chlorines to kill microbiological bugs.
  B. Injecting caustic to lower the ph to < 4.0.
  C. Lowering solids content in boiler feed water to less than 50 ppm.
  D. Maintaining a protective corrosion layer of magnetite (Fe3O4).
  D. Maintaining a protective corrosion layer of magnetite (Fe3O4).