Section 6B - Interval & Extent Of Inspection (API 570 pg 47-51)

Question 1

1. On- site process services that are flammable but slowly vaporize during a release, such as those that operate below the boiling point but above the flash point, are considered:

A. Class 1 piping
B. Class 2 piping.
C. Class 3 piping.
D. Class 4 piping.

Answer 1

B. Class 2 piping.

Question 2

2. On-site process services that are flammable but do NOT significantly vaporize during a release, such as those that operate below the flash point, are considered:

A. Class 1 piping
B. Class 2 piping.
C. Class 3 piping.
D. Class 4 piping.

Answer 2

C. Class 3 piping.

Question 3

3. An on-site piping system was classified by B31.3 as category D. What is the API 570 classification for this piping?

A. Class 1 piping
B. Class 2 piping.
C. Class 3 piping.
D. Class 4 piping.

Answer 3

D. Class 4 piping.

Question 4

4. Off-site gasoline is considered as:

A. Class 1 piping
B. Class 2 piping.
C. Class 3 piping.
D. Class 4 piping.

Answer 4

C. Class 3 piping.

Question 5

5. Off-site caustic is considered as:

A. Class 1 piping
B. Class 2 piping.
C. Class 3 piping.
D. Class 4 piping.

Answer 5

C. Class 3 piping.

Question 6

6. In petrochemical industry, the majority of the unit process piping is classified as:

A. Class 1
B. Class 2
C. Class 3
D. Class 4

Answer 6

B. Class 2

Question 7

7. Inspection of class 4 piping is:

A. Optional.
B. Based on environmental impacts.
C. Based on health and safety impacts.
D. Completed at least every 10 years.

Answer 7

A. Optional.

Question 8

8. Inspection of class 4 piping is based on:

A. Environmental impacts.
B. Health and safety impacts.
C. Business impacts.
D. Corrosion specialist’s opinion.

Answer 8

C. Business impacts.

Question 9

9. External inspection intervals on piping can be established by using a valid RBI assessment conducted in accordance with:

A. API 570.
B. API 578.
C. API 579.
D. API 580.

Answer 9

D. API 580.

Question 10

10. Which of the following is NOT a factor that could affect the likelihood of CUI on an existing piping system?

A. Local climate conditions.
B. The condition of the coating system.
C. Process fluids.
D. Insulation design and condition.

Answer 10

C. Process fluids.

Question 11

11. CUI can occur on insulated carbon steel piping systems operating between:

A. 25–250°F.
B. 10–350°F.
C. 40–125°F.
D. 120–400°F.

Answer 11

B. 10–350°F.

Question 12

12. CUI is found at a damaged insulation area. What should be done?

A. Inspect additional areas of the piping system.
B. Inspect a minimum of 50% of the piping system.
C. Strip insulation and inspect 100% of the affected piping system.
D. Inspector stands in the pipe rack and shouts “Eureka, I found it!”

Answer 12

A. Inspect additional areas of the piping system.

Question 13

13. A class 4 piping system has some damaged insulation. How many of the damaged areas should be inspected? (Open book)

A. 25%
B. 50%
C. 75%
D. 100%
E. Inspection is optional

Answer 13

E. Inspection is optional

Question 14

14. A class 1 piping system has some damaged insulation. How many of the damaged areas should be inspected? (Open book)

A. 25%
B. 50%
C. 75%
D. 100%

Answer 14

C. 75%

Question 15

15. A class 3 piping system has some damaged insulation. How many of the damaged areas should be inspected? (Open book)

A. 25%
B. 50%
C. 75%
D. Inspection is optional

Answer 15

A. 25%

Question 16

16. A class 1 piping system is being inspected for CUI. How many of the non-damaged areas should be inspected? (Open book)

A. 10%
B. 25%
C. 33%
D. 50%
E. 75%
F. 100%

Answer 16

D. 50%

Question 17

17. A class 3 piping system is being inspected for CUI. How many of the non-damaged areas should be inspected? (Open book)

A. 10%
B. 25%
C. 33%
D. 50%
E. 75%
F. Inspection is optional.

Answer 17

A. 10%

Question 18

18. What is the recommended extent of CUI inspection at non-damaged locations on class 2 piping systems? (Open book)

A. 75%
B. 50%
C. 33%
D. 10%.

Answer 18

C. 33%

Question 19

19. When thickness measurements are conducted on a pipe circuit, each thickness measurement set should include:

A. A representative #of CML’s.
B. All CMLs
C. At least 50% of the CMLs
D. At least 75% of the CMLs

Answer 19

A. A representative #of CML’s.

Question 20

20. When thickness measurements are taken, each thickness measurement set should include:

A. All CMLs
B. CMLs on each type of component, e.g. ells, tees.
C. The CML with the lowest remaining corrosion allowance.
D. The CML with the longest remain life.

Answer 20

B. CMLs on each type of component, e.g. ells, tees.

Question 21

21. When thickness measurements are conducted , each thickness measurement set should include:

A. The CML with the highest corrosion rate.
B. The CML with the earliest renewal date.
C. The CML with the lowest remaining corrosion allowance.
D. All CMLs in the piping circuit.

Answer 21

B. The CML with the earliest renewal date.

Question 22

22. Thickness measurements on a pipe circuit are due. This circuit is subject to non-uniform corrosion. Who is responsible to determine the specific CMLs that need to be measured?

A. Authorized inspector.
B. Corrosion specialist.
C. Authorized inspector in consultation with the corrosion specialist.
D. Authorized inspector in consultation with the piping engineer.
E. Authorized inspector in consultation with either the corrosion specialist or the Piper engineer.

Answer 22

E. Authorized inspector in consultation with either the corrosion specialist or the Piper engineer.

Question 23

23. Which two methods can be used to manage the thickness measurement’s program?

A. Circuit analysis and point-to-point methods.
B. Circuit analysis and exponential methods.
C. Exponential and point –to– point methods.
D. Point–to-point and relative analysis methods.
E. Relative analysis and circuit analysis methods.

Answer 23

A. Circuit analysis and point-to-point methods.

Question 24

24. The point – to - point method for thickness measurements may lead to:

A. Failures if not closely managed.
B. Frequent inspections if not closely managed.
C. Overly conservative corrosion rates.
D. Overly conservative inspection intervals.

Answer 24

B. Frequent inspections if not closely managed.

Question 25

25. The circuit analysis method may use: A. FFS analysis to determine a representative minimum thickness. B. FFS analysis to determine a representative circuit corrosion rate. C. Statistical analysis to determine a representative minimum thickness. D. Statistical analysis to determine a representative circuit corrosion rate.

Answer 25

D. Statistical analysis to determine a representative circuit corrosion rate.

Question 26

26. The circuit analysis method is applicable with: A. All forms of wall loss. B. Only highly localized corrosion. C. Only uniform corrosion. D. Only uniform or mildly localized corrosion.

Answer 26

D. Only uniform or mildly localized corrosion.

Question 27

27. When performing analysis of thickness data, which is the least important to check? A. Are corrosion rates accelerating? B. Are any CML remaining life’s below 20 years? C. Are particular locations corroding faster? D. Are particular types of components corroding faster than others? E. Is the short-term rate significantly different than the long-term rate?

Answer 27

B. Are any CML remaining life’s below 20 years?

Question 28

28. When taking thickness readings on a circuit that is subject to localized corrosion: A. 50% of the CMLs should be inspected with profile RT. B. 100% of the CMLs should be inspected with profile RT. C. The orientation of the sample point should be recorded. D. A 360° UT scan should be conducted at each CML.

Answer 28

C. The orientation of the sample point should be recorded.

Question 29

29. Which of the following is not a good reason for making a CML “inactive”? A. CML is on a small-bore class 3 deadleg B. CML is inaccessible during operation. C. CML was inappropriately placed. D. Historically this CML has very little corrosion.

Answer 29

A. CML is on a small-bore class 3 deadleg

Question 30

30. Inspection of primary process piping that is small-bore: A. Should be done to the same requirements as large-bore piping. B. Should be done to the requirements of large bore class 2 Piping. C. Should be done to the requirements of large bore class 3 piping. D. Is optional.

Answer 30

A. Should be done to the same requirements as large-bore piping.

Question 31

31. Inspection of class 1 small – bore secondary process piping is: A. Done to the requirements of large-bore Class 1 primary piping. B. Done to the requirements of large-bore Class 2 primary piping C. Done to the requirements of large-bore Class 3 primary piping. D. Optional.

Answer 31

A. Done to the requirements of large-bore Class 1 primary piping.

Question 32

32. Inspection of class 2 small – bore secondary process piping is: A. Done to the requirements Class 1 primary piping. B. Done to the requirements Class 2 primary piping C. Done to the requirements Class 3 primary piping. D. Optional.

Answer 32

B. Done to the requirements Class 2 primary piping

Question 33

33. Inspection of class 3 or class 4 small – bore secondary process piping is: A. Done to the requirements Class 1 primary piping. B. Done to the requirements Class 2 primary piping C. Done to the requirements Class 3 primary piping. D. Optional.

Answer 33

D. Optional.

Question 34

34. Who is responsible to determine if a deadleg is susceptible to accelerate corrosion? A. Authorized inspector. B. Corrosion specialist. C. Piping engineer. D. Process engineer.

Answer 34

B. Corrosion specialist.

Question 35

35. Which of the following is NOT a potential causes of accelerated corrosion in deadlegs? A. Accumulation of dense hydrocarbons. B. Accumulation of solids. C. Accumulation of water. D. Accumulation of a corrosive materials like ammonium salts. E. Temperature different than mainline.

Answer 35

A. Accumulation of dense hydrocarbons.

Question 36

36. With non-essential deadlegs, consideration should be given to: A. Increasing the alloy content B. Performing 50% UT scan or 50% profile RT. C. Performing 100% UT scan or 100% profile RT. D. Removing them.

Answer 36

D. Removing them.