API 653 Exam Chapter 4

API 653 Exam Chapter 4 -Reasons for Inspection: DamageMechanisms

Now try this first set of self-test questions covering the first two DMs.

4.5 API 571 practice questions (set 1)

Take a Free API 653 Exam Chapter 4 Practice test with Latest API 571 Practice Question and Answers (Set 1, 2, and 3)

1.

Q1. API 571: brittle fracture
Which of these is a description of brittle fracture?

 
 
 
 

2.

Q2. API 571: brittle fracture: affected materials
Which of these storage tank construction materials are particularly susceptible to brittle fracture?

 
 
 
 

3.

Q3. API 571: brittle fracture: critical factors
At what temperature is a brittle fracture of a storage tank most likely to occur?

 
 
 
 

4.

Q4. API 571: brittle fracture
Which of these activities is unlikely to result in a high risk of brittle fracture of a storage tank?

 
 
 
 

5.

Q5. API 571: brittle fracture: prevention/mitigation
What type of material change will reduce the risk of brittle fracture?

 
 
 
 

6.

Q6. API 571: brittle fracture: appearance
Cracks resulting from brittle fracture will most likely be predominantly:

 
 
 
 

7.

Q7. API 571: mechanical fatigue: description
What is mechanical fatigue?

 
 
 
 

8.

Q8. API 571: mechanical fatigue: critical factors
As a practical rule, resistance to mechanical fatigue is mainly determined by what aspect of a piece of equipment?

 
 
 
 

9.

Q9. API 571: mechanical fatigue: appearance
What will a fracture face of a component that has failed by mechanical fatigue most likely exhibit?

 
 
 
 

10.

Q10. API 571: prevention/mitigation
Mechanical fatigue cracking is best avoided by:

 
 
 
 

11.

4.7 API 571 practice questions (set 2
Q1. API 571: atmospheric corrosion
Atmospheric corrosion is primarily caused by:

 
 
 
 

12.

Q2. API 571: atmospheric corrosion
As a practical rule, atmospheric corrosion:

 
 
 
 

13.

Q3. API 571: atmospheric corrosion: critical factors
A typical atmospheric corrosion rate in mils (1 mil = 0.001 inches) per year (mpy) of steel in an inland location with moderate precipitation and humidity is:

 
 
 
 

14.

Q4. API 571: CUI: critical factors
Which of these metal temperature ranges will result in the most severe CUI?

 
 
 
 

15.

Q5. API 571: CUI: appearance
Which other corrosion mechanism often accompanies CUI in 300 series stainless steels?

 
 
 
 

16.

Q6. API 571: CUI: affected equipment
Which area of a lagged storage tank shell would you say could be particularly susceptible to CUI?

 
 
 
 

17.

Q7. API 571: CUI: appearance
Once lagging has been removed from an unpainted tank structure, CUI normally looks like this:

 
 
 
 

18.

Q8. API 571: CUI: prevention/mitigation
Which of these actions may reduce the severity of CUI on a lagged storage tank?

 
 
 
 

19.

Q9. API 571: CUI: mitigation
CUI conditions can be identified on an in-use lagged storage tank using:

 
 
 
 

20.

Q10. API 571: CUI: critical factors
Which of these can make storage tank CUI worse?

 
 
 
 

21.

Q11. API 571: soil corrosion
What is the main parameter measured to assess the corrosivity of the soil underneath a storage tank?

 
 
 
 

22.

Q12. API 571: soil corrosion: appearance
What would you expect the result of soil corrosion to look like?

 
 
 
 

23.

Q13. API 571: soil corrosion: protection
Which of these would be used to reduce the amount of soil corrosion in a storage tank?

 
 
 
 

24.

Q14. API 571: soil corrosion: critical factors
What effect does metal temperature have on the rate of soil corrosion?

 
 
 
 

25.

Q15. API 571: soil corrosion: critical factors
Which of these areas would you expect to suffer the worst soil corrosion?

 
 
 
 

26.

4.9 API 571 practice questions (set 3).
Q1. API 571: MIC: description
MIC is caused by the corrosive effects of:

 
 
 
 

27.

Q2. API 571: MIC: appearance
What does MIC typically look like?

 
 
 
 

28.

Q3. API 571: MIC: critical factors
Under what pH values does MIC occur?

 
 
 
 

29.

Q4. API 571: MIC: critical factors
What is the maximum temperature under which you would expect MIC to occur?

 
 
 
 

30.

Q5. API 571: MIC: prevention
MIC is best controlled by:

 
 
 
 

31.

Q6. API 571: description of chloride SCC
Chloride SCC is also called (in API terminology):

 
 
 
 

32.

Q7. API 571: SCC: affected materials
Chloride SCC is known to particularly attack what type of tank construction material?

 
 
 
 

33.

Q8. API 571: SCC: critical factors
What is the lower limit of chloride content at which chloride SCC stops occurring?

 
 
 
 

34.

Q9. API 571: SCC: critical factors
What is the temperature above which chloride SCC becomes more likely under chloride process conditions?

 
 
 
 

35.

Q10. API 571: chloride SCC: appearance
What kind of corrosion deposit is normally seen on the surface of a material suffering from chloride SCC?

 
 
 
 

36.

Q11. API 571: chloride SCC: inspection
Which of these techniques is best able to find chloride SCC?

 
 
 
 

37.

Q12. API 571: chloride SCC: morphology
What shape are chloride SCC cracks?

 
 
 
 

38.

Q13. API 571: caustic SCC
Caustic SCC in storage tanks is also called:

 
 
 
 

39.

Q14. API 571: caustic SCC location
Caustic SCC is particularly common around which locations in storage tanks?

 
 
 
 

40.

Q15. API 571: caustic SCC: critical factors
Caustic SCC can be caused at caustic concentrations of:

 
 
 
 

41.

Q16. API 571: caustic SCC: appearance
Caustic SCC cracks have a greater tendency to propagate:

 
 
 
 

42.

Q17. API 571: sulphuric acid corrosion: affected materials
Which of these tank fittings construction materials would be most resistant to sulphuric acid corrosion?

 
 
 
 

43.

Q18. API 571: sulphuric acid corrosion: critical factors
Which of these sulphuric acid conditions will result in the worst corrosion of a tank construction material?

 
 
 
 

44.

Q19. API 571: sulphuric acid corrosion: prevention
Which of these actions will reduce the effect of corrosion in a system susceptible to sulphuric acid corrosion?

 
 
 
 

45.

Q20. API 571: sulphuric acid corrosion: affected equipment
If a storage tank with trace heating contains a sulphuric acid-rich product, where would you expect the worst corrosion to occur?

 
 
 
 

Question 1 of 45

Click Here To Read Next API 653 Exam Chapter 5 – Inspection Practices and Frequency

Try these practice questions.

4.7 API 571 practice questions (set 2)

4.8 The third group of API 571 DMs

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