SG H Table of ContentsNB11-0204B 1-12-16 SG Historical RVU 2NB13-0902 1-12-16 Historical 13

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File Number: NB11-0204B Task Group Mike Wahl (PM) J. Larson, F. Johnson Subject: Part 3 Supplement 2 Pages: See Below Proposal: Several areas in the repair section need updating for NDE examination.

1. In Part 3, Supplement 2, S2.11 (page 140) add the following text the existing statement:

The nondestructive examination (NDE) requirements, including technique, extent of coverage, procedures, personnel qualification, and acceptance criteria, shall be in accordance with the original code of construction for the pressure-retaining item. Weld repairs and alterations shall be subjected to the same nondestructive examination requirements as the original welds. Where the original code of construction is unknown or the NDE method is not possible or practicable, alternative NDE methods may be used. These methods shall be acceptable to the owner, the Inspector and where required, the Jurisdiction of the pressure-retaining item. NDE methods used shall be suitable for providing meaningful results to verify the integrity of the repair and or alteration. Exclusive use of visual examination (VT) for repair inspection is only permitted when following the requirements of Part 3, 4.4.1 e).

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2. In Part 3, Supplement 2, S2.13 (c) (page 140) replace (c) with statement currently used in Part 3, 3.3.4.1 and Supplement 1, S1.2.10. This changes the paragraph by:

a. Adding a reference to Part 3,3.3.4.8, b. Adding the inspector and jurisdiction acceptance of other corrective measures c. Removes the last two sentences that are covered in detail in Supplement 2.

c) Except as provided in NBIC Part 3, 3.3.4.8, a repair of a defect in a welded joint or base material shall not be made until the defect has been removed. A suitable nondestructive examination (NDE) method, such as magnetic particle (MT) or liquid penetrant (PT), may be necessary to ensure complete removal of the defect. If the defect penetrates the full thickness of the material, the repair shall be made with a full penetration weld such as a double buttweld or single buttweld with or without backing. Where circumstances indicate that the defect is likely to recur, consideration should be given to removing the defective area and installing a flush patch or taking other corrective measures acceptable to the Inspector, and when required, by the Jurisdiction.

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3. In Part 3, Supplement 2, In S.2.13.9.2 (c) (page150) change “be radiographed” to “have Volumetric NDE performed”

4. In Part 3, Supplement 2, In S.2.13.9.3 (a) (page150) change “be radiographically examined” to “have Volumetric NDE performed”

Replace “be radiographed” to “have Volumetric NDE performed”

Replace “be radiographically examined” with “have volumetric NDE performed”

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5. In Part 3, Supplement 2, S.2.13.10.2 (page 153) add (c) stating:

c) If the load on repair area is carried by other forms of construction, such as staybolts,

rivets or tubes, volumetric NDE of the welds is not required.

6. In Part 3, Supplement 2, S.2.13.10.3 b) (page 153) change “radiographically examined”

to “Volumetric NDE”

Replace “be radiographically examined” with “have volumetric NDE performed”

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7. In Part 3, Supplement 2, S.2.13.10.3 d) (page 153) remove current statement redundant with information in S2.13.11.3 and reference S2.13.11.3 Welded Flush Patches in Firebox and Tubesheet Knuckles. Text for d) would change to :

d) For welded flush patches in stayed areas that include a knuckle area see S2.13.11.3.

Welded Flush Patches in Firebox and Tubesheet Knuckles.

8. In Part 3, Supplement 2, Figure S2.13.10.3-a (page 154) Remove figure S2.13.10.3-b Figure will be added to S2.13.11.3 to have all knuckle patch information in one area.

Remove This Figure

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9. In Part3, Supplement 2, S.2.13.11.2 (b) (page 156) replace (b) with the following text:

b) Welded repair of cracks within the points of tangency of a knuckle are permitted. All welds

within the points of tangency of the knuckle shall have volumetric NDE performed.

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10. In Part 3, Supplement 2, Figure S2.13.11.2 (page 157) Remove figure because all welded repair of cracks in knuckle areas require nondestructive examination to be performed from the changes to S.2.13.11.2 (b)

Remove This Figure

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11. In Part 3, Supplement 2, S2.13.11.3 (page 157) Replace current text with a), b), & c) to have all knuckle information in one area (information moved from S S.2.13.10.3) and give more information. New text would state:

a) Any patch not supported by means other than the weld, such as rivets, staybolts, tubes, or other forms of construction, shall have volumetric NDE performed on the weld seams. (See NBIC Part 3, Figure S2.13.11.3-b).

b) Weld seams parallel to a knuckle shall be located no closer to the knuckle than the knuckle point of tangency. (See NBIC Part 3, Figure S2.13.11.3-a).

c) All other requirements specified in NBIC Part 3, S2.13.9.3, S2.13.10.3 and S2.13.12.3 shall be followed

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12. In Part 3, Supplement 2, Figure S2.13.11.3 (page 158) replace current figure S2.13.11.3 with two new ones showing the changes in S2.13.11.3.

Note: Figure S2.13.11.3-a and Figure S2.13.11.3-b have been created in Solid Works and can be exported to a several different file formats. Please e-mail mikew@midstal.com and I can send requested format.

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Add This Figure

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Add This Figure

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File Number: NB13-0902 Task Group Mike Wahl (PM) J. Larson, F. Johnson Subject: Part 3, Supplement 2, Update to Section S2.13.12.3 Page: 160 Proposal:

1. Add new text, 2) & 3) to better explain tube sheet repairs involving the knuckle area.

2. Update Figure S2.13.12.3 3. Add Figure S2.13.12.3A

Explanation: Currently there is little to no information in supplement 2 on the repair of flanged tube sheets. This would add information to better define the use of welded repairs and alternatives for tube sheet repairs involving the knuckle area. 1. Add New Text

2) A flush patch repair can be welded through tube holes or around tube holes. (See NBIC Part 3, Figure S2.13.12.3)

3) If the Flush Patch repair extends through the tube sheet radius either the sheet should

be flanged to match the original tube sheet flange or a welded alternative may be used as shown in NBIC Part 3, Figure S2.13.12.3.A

Add #2) and #3) in this area.

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2. Update Figure S2.13.12.3

Add a 4th diagram to figure S2.13.12.3 to show a tube sheet repair, which encompasses the hand hole opening area, however doesn’t extend through the tube area.

Add 4th diagram here

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3. Add Figure S2.13.12.3A

Add figure S2.13.12.3a to show acceptable and non-acceptable tube sheet repair methods.

Note: Figure S2.13.12.3A has been created in Solid Works and can be exported to a several

different file formats. Please e-mail mikew@midstal.com and I can send requested format.

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