API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 341:

  Deaerators that have not been postweld heat-treated are commonly subject to:

  A. Caustic stress corrosion cracking
  B. Corrosion fatigue
  C. Steam blanketing
  D. Vibration-induced fatigue
  A. Caustic stress corrosion cracking

  ---

  Comprehensive and Detailed From Exact Extract: Per, often operate in environments where concentrated caustic solutions can form API RP 571 deaerators

  locally due to oxygen scavengers and water chemistry control additives.

  When postweld heat treatment (PWHT) is not performed: High residual welding stresses remain Conditions are ideal for caustic stress corrosion cracking (Caustic SCC)

  API RP 571 identifies deaerators as classic examples of equipment that has experienced caustic SCC when PWHT was omitted.

  Referenced Documents (Study Basis):

  API RP 571 - Section on Caustic Stress Corrosion Cracking

• Question 342:

  HTHA is dependant on temperature, hydrogen partial pressure, time and _________.

  A. Pressure
  B. Stress
  C. Yield
  D. Tensile strength
  B. Stress

• Question 343:

  What test is used to determine a material's toughness?

  A. Charpy impact test
  B. Guided bend test
  C. Metallography
  D. Tension test
  E. Physical fitness test
  A. Charpy impact test

• Question 344:

  Blistering and hydrogen-induced cracking (HIC) damage are most affected by what aspect of steels?

  A. Inclusions
  B. Hardness
  C. Residual Stress
  D. Permeability
  A. Inclusions

  ---

  API RP 571 discusses Hydrogen-Induced Cracking (HIC) and Blistering under the section:

  "HIC and blistering are most strongly influenced by non-metallic inclusions, particularly elongated manganese sulfide (MnS) inclusions, which serve as trap sites for hydrogen atoms." "These inclusions create local planes of weakness where atomic hydrogen recombines into molecular hydrogen (H#), causing high pressure and cracking."

  API RP 571, Section 4.2.2.7 - Hydrogen Blistering and HIC)

  Thus, inclusions are the critical material factor, making option A correct.

• Question 345:

  Mitigation of CUI is best achieved by _________.

  A. A properly documented inspection program
  B. A properly installed insulation system
  C. A properly applied coating system
  D. A properly documented NDE program
  C. A properly applied coating system

• Question 346:

  Stress ruptures are characterized by _________ failures and are usually accompanied by thinning at the fracture surface.

  A. Rapid
  B. Fish-mouth
  C. Tensile
  D. None of the above
  B. Fish-mouth

• Question 347:

  __________ are the most common type of equipment susceptible to carburization in the refining industry.

  A. Reactors
  B. Heat exchangers
  C. Heater tubes
  D. Fin Fans
  C. Heater tubes

• Question 348:

  ____________ is the reduction in toughness due to a metallurgical change that can occur in some low alloy steels as a result of long-term exposure in the temperature range of about 650?F to 1100?F.

  A. Hardening
  B. Graphitization
  C. Spheroidization
  D. Temper embrittlement
  D. Temper embrittlement

• Question 349:

  Time to failure by thermal fatigue is primarily affected by:

  A. Magnitude of stress and operating temperature.
  B. Magnitude of stress and number of cycles.
  C. Carbon content in material and operating temperature.
  D. Carbon content in material and number of cycles.
  B. Magnitude of stress and number of cycles.

• Question 350:

  Thermal fatigue is caused by:

  A. Cyclic stresses that come from temperature variations.
  B. Long term operation at elevated temperatures.
  C. Excessive thermal growth.
  D. Hours of physical activity during a hot summer day.
  A. Cyclic stresses that come from temperature variations.