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True/False

1. Only certified installers may install C/S for pipe repair.

   True

   False

2. The C/S system may be used to repair pipe up to 80% wall loss subject to GRI Wrap.

   True

   False

3. The C/S system may be used to repair defects associated with general corrosion, dents and gouges.

   True

   False

4. The C/S system can be used to repair cracks.

     True

   False

5. The C/S system may be installed over any type of pipe coating.

   True

   False

6. To repair dents and gouges, all sharp edges must be removed.

   True

   False

7. A coal tar coating helps to cure the C/S adhesive.

   True

   False

8. Gasoline or diesel fuel may be used as a solvent.

   True

   False

9. The C/S must extend a minimum of 2" beyond both sides of the defect area.

   True

   False

10. The C/S system is a permanent repair for external defects with you to 80% wall loss.

   True

   False

Multiple Choice

11. Which application is NOT suitable for the use of C/S?

   General Corrosion defects (80% max. through wall defect)

   "Blunt" mechanical defects

   Sharp Gouges

   Girth weld repairs

   Defects associate with bends & elbows with centerline radius curvature ≥ 3D

12. The key steps to a proper C/S installation are:

   Pipe preparation

   Applying filler to the defect, all tented areas and the leading edge of the starter pad

   Putting plenty of adhesive

   Attaching the C/S to starter pad and aligning the edges of the C/S

   Tightening down the C/S

   Sealing all edges

   All of the above

   A & B

   C, D & E

13. Which of the following defect type(s) are permanently repairable with C/S?

   Internal

   External

   Both

14. After the C/S is installed, the pipe will be restored to ___ of original strength in the repair zone.

   less than 80%

   80%

   at least 100%

15. ___ defects that are repaired with C/S are considered to be temporary.

   Internal

   External

16. ____ is the standard for the degree of cleanliness for the pipe preparation.

   Thumbnail test & anchor pattern

   NACE #3 & an anchor pattern

   NACE # 1

   Wipe with acetone

17. If you can not sandblast, which of the following is recommended to prepare the pipe for a C/S Installation?

   A hand grinder with 24-80 grit sandpaper or disk and solvent wipe

   Burn coating with gasoline

   Only wire brush pipe surface

   Cut coating off with a knife and solvent wipe with Acetone

   None of the above  

18. Coal tar may be used as a coating after the C/S adhesive has cured.

   True

   False

19. If the existing pipe coating is fusion-bonded epoxy, just abrade with sandpaper and solvent wipe with Acetone or MEK before applying C/S.

   True

   False

20. The adhesive kits and filler kits are provided in pre-portioned quantities with the quantity dependent on the size of the C/S to be installed.

   True

   False

21. To determine the quantity of activator to mix with adhesive and filler, the following information is required:

   The type of existing pipe coating

   The relative humidity

   The ambient pipe temperature

   None of the above

22. Prior to sealing the edges of the C/S with adhesive, all excess filler must be removed.

   True

   False

23. The C/S adhesive will typically cure in approximately ___ hour(s)

   1/2

   1

   1-1/2

   2

24. To determine if the adhesive cure is sufficient for applying a pipe coating, the adhesive must reach a minimum hardness of ___.

  40 on a Shore A scale

  60 on a Shore A scale

  80 on a Shore A scale

   Granite

25. When installing multiple C/S's on a straight section of pipe, the maximum gap allowed between C/S's                  is ___ inch(es).

   1/4

   1/2

   1

   2

26. When repairing corrosion associated with a girth weld, the following method(s) are acceptable:

   Grinding off the weld cap and installing a standard 8-wrap C/S according to standard procedures

   Apply a 4-wrap C/S on both sides of the weld, mold filler over the weld, then install a standard 8-wrap C/S centered over the weld

   Apply a standard 8-wrap C/S on both sides of the weld, mold filler over the weld, and then install a standard 8-Wrap C/S centered over the weld

   All of the above

   A & B

   A & C

27. Cracks in the girth weld may be repaired with C/S

   True

   False

28. When repairing corrosion associated with a girth weld, the following limits apply:

   Defect depth must not exceed 50% wall loss and may only encompass 30% of the pipe circumference

   Defect depth must not exceed 50% wall loss and may only encompass 50% of the pipe circumference

   Defect depth must not exceed 80% wall loss and may only encompass 50% of the pipe circumference

   None of the above

29. Single wrap molds should be used to mold the filler over the girth weld.

   True

   False

30. When making a bend repair, install the first unit in the middle of the defect and work outwards.

   True

   False

31. When making bend repair, the maximum gap allowed between bands on the outside of the bend is (inches):

   1/4

   1/2

   3/4

   1

32. When making a bend repair, additional filler should be ordered and the material must be applied to both the inside and outside of the bend.

   True

   False

33. A standard width C/S can be used to repair any type of bend regardless of the bend radius.

   True

   False

34. What is the "edge effect"?

   The nervousness experienced by the installer

   The re-enforcement provided by the C/S extends beyond the physical edge of the C/S

   The pipe section immediately beyond the physical edge of the C/S is weaker than any other section of the pipe.

   All of the above

35. The C/S filler material is ___ .

   Easily substitutes with Bondo putty

   A high compressive material

   Placed in the defect areas, all tented areas and on the leading edge of the starter pad

   A load transfer material will, when cured, provide a load transfer path to the C/S

   All of the above

   B, C & D

36. The C/S restores the ___ of the pipe.

   Axial Strength

   Compressive Strength

   "Hoop" Strength

37. When dealing with condensing pipe, the following step(s) should be taken:

   Solvent wipe pipe surface, allow solvent to flash and quickly attach starter pad or use contact spray adhesive, then proceed with attaching the starter pad.

   After attaching the starter pad, solvent wipe the pipe surface prior to applying adhesive

   A & B

38. When cold temperatures exist and frost is present on the pipe surface, the following step(s) should be taken:

   Adjust activator quantity per charts for the adhesive and filler

   Solvent wipe the pipe surface, allow the solvent to flash and quickly attach the starter pad or use contact spray adhesive, then proceed with attaching the starter pad

   After attaching the starter pad, solvent wipe the pipe surface prior to applying adhesive.

   All of the above

39. A pipe coating is recommended on the outside of a cured C/S.

   True

   False

40. The only two solvents allowed during pipe preparation & ancillary cleaning of the C/S are

&

Short Answer: Please fill in the following questions in complete sentence format:

41. In a girth weld repair, the defect zone shall not exceed the following:

% pipe wall loss

% of pipe circumference

42. Describe the purpose of the filler

43. Explain why two C/S's can be butted up to each other and the pipe will still receive full reinforcement of the damaged area.

44. What is the maximum distance allowed between two C/S's when they are to be butted up next to each other for a single repair?

45. Can coal tar be used as a pipe coating after the adhesive has attained a full fure

46. Why is it recommended to use a pipe coating over the C/S after it has cured?

47. If the pipe temperature is less the 32 degrees F or greater than 100 degrees F what should be done before installing the C/S?

48. What can be done to increase the life of the activators by 3 months?

49. How many C/S unites must be installed to become certified as an installer?

50. Describe the purpose of the two (2) black lines on the final wraps of the C/S sleeves/

51. Since extended reinforcement is provided by the C/S, why must the C/S extend a minimum of 2" beyond both sides of the defect? Explain.

52. What items are needed for a high temperature installation?

53. If a C/S is split circumferentially in half, does the C/S have to be replaced? Is there a loss of reinforcement? Explain. 

54. List 4 reasons why mixed adhesive will not cure.

55.  If a small amount of moisture is trapped under the C/S during installation, what will occur?

56. If the physical limits prevent a coil-pass procedure and a spool feeder is not available, can the installation proceed?  If so, how? Explain.

57. Corrosion is within limits for repair and the extent of the defect is 360 degrees around the pipe, what is the repair procedure?

58. What is the GRIWrap Program?

59. List 4 advantages of the C/S adhesive compared to typical epoxy systems.

60. Explain the role of the Gas Research Institute in the development of the C/S system. 

61. How does the C/S system reinforce the pipe and what failure mechanism does it prevent?

62. Which temperature is used to determine the quantity of activator of mix with the adhesive or filler?

63. What dimensions are required to determine the width of the coils to be used in a bend repair?

64. What can be done if there is no cinch bar on site?

65. Starter pad sheet is damaged and adhesive placed on the pad.  What can be done?

66. What special attention is required with large diameter installations?

67. During a bend repair, where is the filler applied?

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