API API-571 Online Practice Questions and Exam Preparation

API API-571 Online Questions & Answers

• Question 591:

  To avoid cooling water scaling, process side inlet temperatures should be below:

  A. 140癋 (60癈)
  B. 150癋 (66癈)
  C. 175癋 (79癈)
  D. 212癋 (100癈)
  A. 140癋 (60癈)

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  API RP 571 under Cooling Water Corrosion and Scaling: "Cooling water scaling tends to occur more rapidly as water temperature increases. To minimize scaling, inlet

  temperatures to exchangers should be kept below 140癋 (60癈) where possible."

  "Above this temperature, calcium carbonate and other salts tend to precipitate more readily."

  Thus, option A is correct.

• Question 592:

  Steel hardness, __________ and stress are critical factors in causing hydrogen stress cracking.

  A. Temperature
  B. Alloy composition
  C. Strength
  D. None of the above
  C. Strength

• Question 593:

  Which of the following materials are susceptible to nitriding?

  A. Carbon steel
  B. 300 Series SS
  C. 400 Series SS
  D. All of the above
  D. All of the above

• Question 594:

  Which of the following statements is most accurate with regard to thermal fatigue?

  A. Thermal fatigue cracks generally initiate on the interior of a component due to high thermal stress
  B. Because of their ductility, carbon steels have lower resistance to thermal fatigue
  C. Visual examination is an ineffective method of monitoring thermal fatigue
  D. Controlled rates of heating and cooling during startup and shutdown can lower stresses
  D. Controlled rates of heating and cooling during startup and shutdown can lower stresses

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  API RP 571 on Thermal Fatigue emphasizes:

  "Thermal fatigue results from cyclic thermal stresses during startup, shutdown, or transient operations."

  "The best mitigation strategy is to control heating and cooling rates to reduce temperature differentials and

  resulting stress."

  API RP 571, Section 4.2.1.5 - Thermal Fatigue)

  Hence, option D correctly identifies the preventive action.

• Question 595:

  What nondestructive examination (NDE) technique requires the least amount of surface preparation to locate wet H#S damage mechanisms?

  A. ACFM
  B. SWUT
  C. WFMT
  D. LPT
  B. SWUT

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  Comprehensive and Detailed From Exact Extract:

  Wet H#S damage mechanisms include hydrogen blistering, hydrogen-induced cracking (HIC), stepwise cracking (SWC), and stress-oriented hydrogen-induced cracking (SOHIC). These mechanisms are primarily internal and subsurface, as described in API RP 571.

  Shear Wave Ultrasonic Testing (SWUT) is specifically highlighted in API RP 571 as a preferred screening and detection method for wet H#S damage because it can detect subsurface planar defects with minimal surface preparation. Typically, only basic coupling and access are required.

  Why the other options are incorrect:

  Option A (ACFM) is a surface crack detection technique and requires relatively clean surfaces; it is not suitable for subsurface hydrogen damage.

  Option C (WFMT - Wet Fluorescent Magnetic Particle Testing)

  requires extensive surface preparation, coating removal, and direct access to the surface, and only detects surface-breaking flaws.

  Option D (LPT - Liquid Penetrant Testing) also requires clean, bare metal surfaces and cannot detect subsurface damage.

  API RP 571 explicitly notes that ultrasonic techniques, particularly shear wave UT, are widely used for detecting internal hydrogen-related cracking with minimal disruption and surface preparation, making it the most effective choice for wet H#S damage screening.

  Referenced Documents (Study Basis):

  API RP 571 - Section on Wet H#S Damage (HIC, SOHIC, Blistering)

  API Corrosion and Materials Inspection Study Guide

• Question 596:

  300 Series SS is susceptible to LME when it comes in contact with molten ________.

  A. Cadmium
  B. Mercury
  C. Zinc
  D. Lead
  C. Zinc

• Question 597:

  Increasing the chromium in steels offers no major improvement in resistance to CO?corrosion until a minimum of __________ is reached.

  A. 9%
  B. 12%
  C. 5%
  D. 7%
  B. 12%

• Question 598:

  _________ is a form of carburization resulting in accelerated localized pitting which occurs in carburizing gases and/or process streams containing carbon and hydrogen. Pits usually form on the surface and may contain soot or graphite dust.

  A. Hydrate corrosion
  B. Carbide corrosion
  C. Spheroidization
  D. Metal dusting
  D. Metal dusting

• Question 599:

  Where is PASCC normally located?

  A. Adjacent to welds
  B. On impellers
  C. At stress risers
  D. At flanges
  A. Adjacent to welds

• Question 600:

  There is currently no known metal alloy that is immune to _________ under all conditions.

  A. Carburization
  B. Metal dusting
  C. Decarburization
  D. None of the above
  B. Metal dusting