Take A Free API 571 Exam Practice Test – Quiz Course

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Here you can take the Free API 571 Exam Practice Test with Latest Corrosion and Materials Questions and Answers

1.

Vibration-induced fatigue can be eliminated or reduced through _________ and the use of supports and vibration-dampening equipment. Material upgrades are not usually a solution.

 
 
 
 

2.

Weld heat-affected zone graphitization is most frequently found in the heat-affected zone adjacent to welds in narrow bands, corresponding to the low-temperature edge of the heat-affected zone, in multi-pass welded butt joints, these zones overlap each other covering the entire cross-section. Because of its appearance, this type of graphitization is called ____________.

 
 
 
 

3.

Welds joining dissimilar materials (ferritic and austenitic) may suffer ___________-related damage at high temperatures due to thermal expansion stresses.

 
 
 
 

4.

Wet H²S services or ___________ acid services are processes where hydrogen diffuses into the steel and hydrogen embrittlement (HE) is an issue.

 
 
 
 

5.

What alloying element determines the resistance of an alloy to sulfidation?

 
 
 
 

6.

What determines the likelihood and severity of corrosion for flue gas dew point corrosion?

 
 
 
 

7.

What determines the susceptibility of an alloy to sulfidation?

 
 
 
 

8.

What is not a proven method for the detection of HTHA damage?

 
 
 
 

9.

What is the atmospheric corrosion rate if carbon steel is exposed in a dry rural environment?

 
 
 
 

10.

What is the chemical symbol for butane of butylenes?

 
 
 
 

11.

What is the chemical symbol for ethane or ethylene?

 
 
 
 

12.

What is the chemical symbol for propane or propylene?

 
 
 
 

13.

What is the typical erosion-corrosion rate in mpy of Monel immersed in a seawater flume with the seawater traveling over it at 4 fps?

 
 
 
 

14.

What kind of steel is not susceptible to SCC?

 
 
 
 

15.

What materials are affected most by atmospheric corrosion?

 
 
 
 

16.

What materials are usually affected by CUI?

 
 
 
 

17.

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

 
 
 
 

18.

What percent of chlorides is safe for exposure to 300 series stainless steel?

 
 
 
 

19.

What standard refers to Fitness-For-Service evaluations?

 
 
 
 

20.

What standard refers to Risk-Based-Inspection?

 
 
 
 

21.

What structure is 304 stainless steel?

 
 
 
 

22.

What structure is 409 stainless steel?

 
 
 
 

23.

What structure is 410 stainless steel?

 
 
 
 

24.

What test is used to determine a materials’ toughness?

 
 
 
 

25.

What treatment is used to prevent boiler feed water corrosion?

 
 
 
 

26.

What type of damage is caused by thermal fatigue?

 
 
 
 

27.

What type of on-stream inspection method can detect the loss of refractory on an operating unit?

 
 
 
 

28.

What type of unit suffers severe erosion-corrosion due to exposure to naphthenic acids in some crude oil?

 
 
 
 

29.

What usually causes corrosion in boiler feedwater and condensate return systems?

 
 
 
 

30.

When carbon is absorbed into a material at elevated temperatures while in contact with a carbonaceous substance it is called carburization. Temperatures usually have to be above __________ for this to occur.

 
 
 
 

31.

When caustic stress corrosion cracking is a concern, steam out of ___________ carbon steel piping and equipment should be avoided.

 
 
 
 

32.

When connected to a more anodic material, titanium may suffer severe __________.

 
 
 
 

33.

Where is PASCC normally located?

 
 
 
 

34.

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

 
 
 
 

35.

Which of the following materials are subject to mechanical fatigue?

 
 
 
 

36.

Which material below is not susceptible to caustic corrosion?

 
 
 
 

37.

Which material does not have an endurance limit?

 
 
 
 

38.

Which of the following materials are not susceptible to hydrogen stress cracking?

 
 
 
 

39.

Which of the following alkanolamine systems is the least aggressive in causing amine corrosion?

 
 
 
 

40.

Which of the following alkanolamine systems is the most aggressive in causing amine corrosion?

 
 
 
 

41.

Which of the following are affected by sulfidation?

 
 
 
 

42.

Which of the following are susceptible to thermal fatigue?

 
 
 
 

43.

Which of the following can be affected by 885°F Embrittlement?

 
 
 
 
 

44.

Which of the following does not increase the likelihood of atmospheric corrosion?

 
 
 
 

45.

Which of the following is not a critical factor that contributes to a brittle fracture?

 
 
 
 

46.

Which of the following is not a major factor associated with boiler water condensate corrosion?

 
 
 
 

47.

Which of the following is not a major factor associated with corrosion by sulfidation?

 
 
 
 

48.

Which of the following is not a method used to prevent brittle fracture?

 
 
 
 

49.

Which of the following is not a primary factor contributing to erosion-corrosion?

 
 
 
 

50.

Which of the following is not a prime candidate for thermal fatigue?

 
 
 
 
 

51.

Which of the following is not a primary factor contributing to erosion?

 
 
 
 
 

52.

Which of the following is not the primary initiating point for thermal fatigue?

 
 
 
 

53.

Which of the following materials are affected by mechanical fatigue cracking?

 
 
 
 

54.

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

 
 
 
 

55.

Which of the following materials are susceptible to nitriding?

 
 
 
 

56.

Which of the following materials are susceptible to polythionic acid SCC?

 
 
 
 

57.

Which of the following materials are the least susceptible to caustic embrittlement?

 
 
 
 

58.

Which of the following materials is affected by high-temperature corrosion?

 
 
 
 

59.

Which of the following materials is least affected by atmospheric corrosion?

 
 
 
 

60.

Which of the following materials is least affected by a brittle fracture?

 
 
 
 

61.

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

 
 
 
 

62.

Which of the following materials is not susceptible to high-temperature hydrogen attack?

 
 
 
 

63.

Which of the following materials is not susceptible to SCC?

 
 
 
 

64.

Which of the following materials is susceptible to carburization?

 
 
 
 

65.

Which of the following materials is susceptible to CO² corrosion?

 
 
 
 

66.

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

 
 
 
 

67.

Which of the following metals is the most anodic?

 
 
 
 

68.

Which of the methods is effective for finding thermal fatigue cracks?

 
 
 
 

69.

Which of these cast irons are not susceptible to graphitic corrosion?

 
 
 
 

70.

Which of these materials are not susceptible to PASCC?

 
 
 
 

71.

Which of these materials is not susceptible to Spheroidization?

 
 
 
 

72.

Which of these materials is susceptible to brittle fracture?

 
 
 
 

73.

Which of these materials is susceptible to creep damage?

 
 
 
 

74.

Which of these materials exhibit an endurance limit below which fatigue cracking will not occur?

 
 
 
 

75.

Which of these materials is not susceptible to amine cracking?

 
 
 
 

76.

Which of these materials is susceptible to 885°F embrittlement?

 
 
 
 

77.

With 885°F embrittlement, increasing amounts of _______ increase susceptibility to damage when operating in the high-temperature range of concern.

 
 
 
 

78.

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

 
 
 
 

79.

With chloride stress corrosion cracking, ___________ temperatures ____________ the susceptibility for cracking.

 
 
 
 

80.

With CI SCC, _________ levels of chloride _______ the likelihood of cracking.

 
 
 
 

81.

With CO² corrosion, increasing temperature ________ corrosion rates up to the point where CO² is vaporized.

 
 
 
 

82.

With cooling water corrosion, _________ oxygen content tends to _______ carbon steel corrosion rates.

 
 
 
 

83.

With creep, increased stress due to loss in thickness from corrosion will _________ time to failure.

 
 
 
 

84.

With CUI, corrosion rates ________ with increasing metal temperatures up to the point where the water evaporates quickly.

 
 
 
 

85.

With decarburization, the decarburized layer will be free of carbide phases. Carbon steel will be _________.

 
 
 
 

86.

With HF acid corrosion, oxygen contamination __________ the corrosion rate of carbon steel and promotes accelerated corrosion and SCC of Alloy 400.

 
 
 
 

87.

With high-temperature hydrogen attack, ________ using a combination of velocity ratio and backscatter has been the most successful in finding cracking.

 
 
 
 

88.

With high temperature sulfide corrosion (sulfidization), noticeable increases may be found downstream of ________injection points.

 
 
 
 

89.

With hydrofluoric acid corrosion, corrosion rates increase with ________ temperatures and ________ HF concentrations.

 
 
 
 

90.

With short-term overheating, time to failure will __________ as internal pressures or loading decrease.

 
 
 
 

91.

With sour water corrosion, at a given pressure, the H²S concentration in the sour water _________ as temperatures__________.

 
 
 
 

92.

With sour water corrosion, corrosion increase with __________NH4HS concentration and _________ velocity.

 
 
 
 

93.

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

 
 
 
 

94.

With steam blanketing, failure occurs as a result of _______ in the tube from the internal steam pressure at the elevated temperature.

 
 
 
 

95.

With sulfidation, the presence of oxygen _________ corrosion.

 
 
 
 

96.

With sulfuric acid corrosion, alloys such as Alloy 20 resist dilute corrosion and form a protective _________ film on the surface.

 
 
 
 

97.

With sulfuric acid corrosion, carbon steel corrosion rates increases significantly if the flow velocity exceeds about ___________ fps or at acid concentrations below ________.

 
 
 
 

98.

With sulfuric acid corrosion, mix points with _______ cause heat to be released and high corrosion rates can occur where the acid becomes diluted.

 
 
 
 

99.

With sulfuric acid corrosion, the presence of oxidizers can_______ the corrosion rate.

 
 
 
 

100.

With thermal fatigue, time to failure is a function of the magnitude of stress and the number of cycles and decreases with _________ stress and _________ cycles.

 
 
 
 

101.

With very few exceptions, cooling water should always be on the ______ side to minimize stagnant areas.

 
 
 
 

102.

Titanium should not be used in known hydriding services such as ______ or _____.

 
 
 
 

103.

To prevent carburization, select alloys with strong surface oxide or sulfide film former such as _________.

 
 
 
 

104.

To prevent hydrogen embrittlement, use lower-strength steels and __________ to temper the microstructure, improve ductility and reduce residual stress.

 
 
 
 

105.

Type 304L SS is satisfactory for phosphoric acid concentration of 100% up to about ___________. Type 316L is required from there to 225°F.

 
 
 
 

106.

Typical HF Alkylation units operate with 1% to 3% water in the acid, equivalent to an HF-in-water concentration of 97% to 99% and the temperatures are generally below__________.

 
 
 
 

107.

Units, where graphitization may be suspected, are the FCCU and the _______ unit.

 
 
 
 

108.

__________ usually occurs when a colder liquid contact a warmer metal surface.

 
 
 
 

109.

__________ usually occurs when a colder liquid contact a warmer metal surface.

 
 
 
 

110.

A vacuum tower operating at 740°F is being entered to inspect. Several sets of Type 410 SS trays are bent at various angles. The trays are removed in order to straighten them. When an attempt is made to straighten them cracks form at the bends. What type of damage mechanism would cause the cracks to form?

 
 
 
 

111.

Vessels constructed after December 1987 are subject to the requirements of _________ of ASME Section VIII, Division 1.

 
 
 
 

Question 1 of 111

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API 571 Exam Pattern for 2025

Exam Duration and Format:

  • Length: 3 hours and 15 minutes
  • Questions: 110 multiple-choice questions (100 scored, 10 pretest)
  • Type: Closed-book exam

Recommended Study Material:

  • Primary Source: API Recommended Practice 571, 3rd Edition, March 2020

Key Knowledge Areas:

  1. Terminology – Understand key terms, definitions, and acronyms.
  2. Damage Mechanisms – Cover various aspects such as the mechanism’s name, description, affected materials, critical factors, and prevention strategies. Knowledge of inspection and monitoring techniques is also essential.

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