J16--Submarine_Maintenance_Standard_6350-081-006 _Inspect_and_Repair_Vibration_Damping.pdf

FOR OFFICIAL USE ONLY

SUBMEPP

MS NO. 6350-081-006 REV E CHG-8

SUBMARINE

MAINTENANCE

STANDARD

MRDESCRIPTION: Inspect and repair vibration damping.

DESTRUCTION NOTICE. Destroy by any method that will prevent disclosure of contents or reconstruction of the document.

SUBMEPPAPPROVAL

Martha M. Bowman

SYSTEM/COMPONENT ENGINEER/TECHNICIAN

Cynthia L. Waters 8/4/14

PROGRAMMANAGER DATE

DISTRIBUTION STATEMENT D. Distribution authorized to DOD and DOD contractors only (Administrative/Operational use). Other requests shall be referred to COMNAVSEASYSCOM or higher DOD authority.

Class: SSN688

MS NO. 6350-081-006 REV E CHG-8 PAGE i

REVISIONS/CHANGES

REV DESCRIPTION APPROVAL & DATE

- Original issue. This MS was established to cover maintenance requirements previously covered by TRS No. 0607-086-003 for SSN688 Class.

Gary Jewell Eric E. Blough

4/29/96 A The MS was revised to:

1. Incorporate Norfolk UACS 0184-96 (changed to reference appropriate sections of MIL-STD-2148(SH)).

2. Incorporate Norfolk UACS 0189-96 (clarified stud replacement criteria).

3. Incorporate SUBMEPP comments (added Attachment 1, Material Condition Feedback (MCF) Requirements).

Gary Jewell Eric E. Blough

12/20/96

B The MS was revised to:

1. Incorporate UACS SUBMEP-00-006 (added criteria for plastic restraining covers).

2. Incorporate SUBMEPP comments (clarified inspection and repair instructions).

Howard M. Walters Eric E. Blough

6/16/00

C The MS was revised to:

1. Incorporate SUBMEPP comments (added applicable steps of GAC as an attachment and modified preservation requirement).

Howard M. Walters Scott E. Mercer

6/15/01

D The MS was revised to:

1. Incorporate SUBMEPP comments (clarified fastener material).

Howard M. Walters Scott E. Mercer

6/21/02 D CHG-1 CHG-1 consists of Cover Page, Page i, and Page 8 of 8. The MS was changed to:

1. Incorporate SUBMEPP comments (corrected drawing numbers for the SSN719 and 720).

Howard M. Walters Scott E. Mercer

6/20/03

E The MS was revised to:

1. Incorporate UACS PNS-03-156 (incorporated contents of MS No. 6350- 081-007 Rev D and incorporated/clarified structural criteria for steel under tiles).

2. Incorporate SUBMEPP comments (updated GAC attachment to Revision H requirements and updated SUBMEPP’s address on the MCF Requirements form).

Martha M. Bowman Scott E. Mercer

7/16/04

E CHG-1 CHG-1 consists of Cover Page, Page ii, Page 1 of 8, and Attachment 8, Pages 15, 17, and 19 of 19. The MS was changed to:

1. Incorporate SUBMEPP comments (updated Reference (d) and updated GAC attachment to Revision H CHG-1 requirements).

Martha M. Bowman Scott E. Mercer

2/17/06

E CHG-2 CHG-2 consists of Cover Page, Page ii, Pages 1 through 10 of 10, and Attachments 2 through 7, Pages 3 through 10, 12, and 14 of 19. The MS was changed to:

Martha M. Bowman Scott E. Mercer

5/19/06

MS NO. 6350-081-006 REV E CHG-8 PAGE ii

REVISIONS/CHANGES

REV DESCRIPTION APPROVAL & DATE

1. Incorporate TMRs A113-05 and A092-05 (revised Boundaries; added Notes 4 and 5; revised warning; revised Tables 1 and 3; and revised MRPLs of Attachments 2 through 7).

E CHG-3 CHG-3 consists of Cover Page, Page ii, Pages 2 and 4 through 6 of 10, and Attachment 8, Pages 15 through 17 of 19. The MS was changed to:

1. Incorporate UACS PHNS-05-017 (added PCB warning).

2. Incorporate SUBMEPP comments (updated GAC attachment to Revision H CHG-2 requirements).

Martha M. Bowman Scott E. Mercer

2/23/07

E CHG-4 CHG-4 consists of Cover Page, Page ii, Pages 1 and 4 through 6 of 10, and Attachment 1, Pages 1 and 2 of 19. The MS was changed to:

1. Incorporate UACS SUBMEP-08-116 (changed Attachment 1 to a new, damping tile specific MCF Form).

Martha M. Bowman Scott E. Mercer

7/10/08

E CHG-5 CHG-5 consists of Cover Page, Page iii, Pages 2, 5, and 6 of 10, and Attachment 8, Pages 15 through 17 and 19 of 19. The MS was changed to:

1. Incorporate UACS EBCORP-08-031 (changed Step 1.c. to prevent conflicts within the document).

2. Incorporate SUBMEPP comments (deleted CRES warning; included CRES information in Step 1.b.(2); added optional use of ULTEM per DDGOS change; and updated GAC attachment to Revision H CHG-3 requirements).

Martha M. Bowman Jim Rizas 5/29/09

E CHG-6 CHG-6 consists of Cover Page, Page iii, and Pages 5, 9, and 10 of 10. The MS was changed to:

1. Incorporate UACS SUBMEP-09-283 (updated MS to reflect DDGOS Rev A, ACN M05-09, allowing the use of VHB tape on selected tile).

Martha M. Bowman Jim Rizas 3/16/10

MS NO. 6350-081-006 REV E CHG-8 PAGE iii

REVISIONS/CHANGES

REV DESCRIPTION APPROVAL & DATE

E CHG-7 CHG-7 consists of Cover Page, Page iii, Pages 4 through 7, 9, and 10 of

10, and Attachments 2 through 8, Pages 3 through 19 of 19. The MS was changed to:

1. Incorporate UACS SUBMEP-12-095 (added caution alerting users to MS policy and applicability limitations MS No. 7650-081-010).

2. Incorporate UACS SUBMEP-12-131 (incorporated the reduced tile replacement requirements of NAVSEA ltr 9073 ser PMS 392A3/0073 dated 17 June 2009).

3. Incorporate SUBMEPP comments (removed CAGE from MRPLs and updated GAC attachment to Revision H CHG-4 requirements).

Michael E. Durkin Jim Rizas 8/13/12

E CHG-8 The MS was changed to:

1. Incorporate UACS SUBMEP-13-475 (modified damping inspection criteria and revised MRPLs of Attachments 2, 4, and 6).

2. Incorporate SUBMEPP comments (updated GAC attachment to Revision H CHG-5 requirements and updated format to latest XML technology in preparation of future HTML output).

Martha M. Bowman Cynthia L. Waters

8/4/14

MS NO. 6350-081-006 REV E CHG-8 Page 1 of 9

MAINTENANCE STANDARD

EQUIPMENT/COMPONENT MS NO. 6350-081-006

Exterior Vibration Damping

SYSTEM RELATED MAINTENANCE

Insulation (Hull, Bulkhead, Deck) URO MRC 003

MS No. 4690-081-002 MS No. 6310-081-015

MR DESCRIPTION

1. Inspect and repair vibration damping.

ATTACHMENTS

1. MBT Damping Tile Feedback Form

2. Equipment Guide List/Maintenance Requirement Parts List, Exterior Vibration Damping (SSN688-718, 721-725, 750-770)

3. Equipment Guide List/Maintenance Requirement Parts List, Interior Vibration Damping (SSN688-718, 721-725, 750-770)

4. Equipment Guide List/Maintenance Requirement Parts List, Exterior Vibration Damping (SSN719 and 720)

5. Equipment Guide List/Maintenance Requirement Parts List, Interior Vibration Damping (SSN719 and 720)

6. Equipment Guide List/Maintenance Requirement Parts List, Exterior Vibration Damping (SSN771-773)

7. Equipment Guide List/Maintenance Requirement Parts List, Interior Vibration Damping (SSN771-773)

8. Applicable Steps of General Acceptance Criteria (GAC)

TECHNICAL REFERENCE DATA

(a) Vibration Damping Materials, Procedures for Installation, Maintenance and Repair

MIL-STD-2148 (SH)

(b) Submarine Preservation General Painting MS No. 6310-081-015

(c) Conduct Hull Structural Survey URO MRC 003

(d) Submarine Structural Inspection and Repairs MS No. 7650-081-091

(e) Welding and Allied Processes, NSTM Chapter 074 NAVSEA S9086-CH-STM-010/CH-074

NOTE : Additional documentation and detailed part drawings that may be required for corrective maintenance are listed in the Maintenance Requirement Parts List.

SAFETY PRECAUTIONS

1. Observe standard safety precautions.

2. RadCon survey must be completed prior to inspecting external areas of the ship’s pressure hull.

3. Tanks and void spaces must be certified gas-free prior to entry and periodically to ensure safe, gas-free, working conditions.

4. Attentuating (sound damping) plates mounted on the casings and covers may be contaminated with polychlorinated biphenyl (PCB). Refer to “Navy Safety Precautions for Forces Afloat”, OPNAV INST 5100.19, for appropriate handling procedures.

MS NO. 6350-081-006 REV E CHG-8 Page 2 of 9

BOUNDARIES

1. Boundaries of this MS are the vibration damping including all damping material and fasteners.

MS NO. 6350-081-006 REV E CHG-8 Page 3 of 9

Preliminary

Figure 1. Typical Vibration Damping Installation

CAUTION: Familiarity with the Maintenance Standard (MS) Program policy and applicability limitations identified in MS No. 7650-081-010 is required prior to use of this MS.

a. Ensure compliance with Type Commander’s instructions before entering tanks.

b. Ensure compliance with Type Commander’s instructions when working in the sail.

c. Ensure fairwater planes or bow planes, stern planes, and rudder are tagged out in accordance with Type Commander’s instructions.

WARNING: RadCon survey must be completed prior to inspecting external areas of the ship’s pressure hull.

WARNING: Tanks and void spaces must be certified gas-free prior to entry and periodically to ensure safe, gas-free, working conditions.

1. Inspect and repair vibration damping.

NOTE 1: All exterior damping installed is identified in Table 1.

NOTE 2: Drawing applicability index and all interior damping installed is identified in Table 2.

PROCEDURE

MS NO. 6350-081-006 REV E CHG-8 Page 4 of 9

NOTE 3: Table 3 is a drawing applicability index for exterior damping.

NOTE 4: Damping tile is not required on the interior surfaces of composite non-watertight access covers in the sail.

1.a. Compare the damping coverage areas and treatments with the actual installation drawings as listed in Table 1 through Table 3 and correct deficiencies. Report missing tiles by tank in Attachment 1 Column K.

NOTE 5: Prior to disassembly, refer to Instructions for Material Condition Feedback (MCF) Requirements in Attachment 1.

NOTE 6: Missing damping can be identified by fouled surfaces (e.g., leftover adhesive, evidence of missing or broken studs, tiles, etc.). Clean surfaces show that vibration damping was not installed (e.g., around zincs, in way of shore connection hatches, loading hatches, etc.).

WARNING: Attentuating (sound damping) plates mounted on the casings and covers may be contaminated with polychlorinated biphenyl (PCB). Refer to “Navy Safety Precautions for Forces Afloat”, OPNAV INST 5100.19, for appropriate handling procedures.

1.b. Visually inspect damping in accordance with Step 1.b.(1) through Step 1.b.(6) and correct deficiencies.

1.b.(1) Loose, cracked, broken, or missing constraining/restraining layers are not acceptable.

NOTE 7: Nut removal solely to determine acceptability of threads is not required.

1.b.(1)(a) Maximum allowable reduction in constraining layer thickness due to corrosion or pitting is 0.020” or 20 percent of original design thickness, whichever is less.

1.b.(1)(b) Areas of plastic restraining covers that have minor damage, such as a roughened surface (for example by abrasive blasting), does not need to be repaired unless the effectiveness of the cover is impaired.

1.b.(1)(c) Type II damping treatments may be installed in MBTs, freefloods, and superstructure with PVC restraining plates in lieu of the design required GRP plates.

NOTE 8: CRES fasteners may be used in dry spaces if desired.

1.b.(2) Material for replacement stud, nuts, and washers for damping tiles exposed to seawater or in wet spaces must be the right material. If any part of the fastening system is replaced, all fastener parts must be checked to ensure the installed material is correct. Do not mix carbon steel and CRES fastener pieces.

1.b.(2)(a) Studs must be Type 316L (UNS No. S31603) in accordance with MIL-S-24149.

1.b.(2)(b) Material for replacement nut and washers may be fiberglass reinforced ULTEM 2300 plastic flanged nuts per EBDiv Specification 3722. When CRES is used, 316L should be used because of its superior corrosion properties; however, for nuts and washers only, if 316L is not available, 316 may be used.

1.b.(2)(b){1} CRES nuts must be hexagonal for 250 degree service in accordance with NASM25027.

1.b.(2)(b){2} CRES washers must perform in accordance with ANSI-B-27.2.

1.b.(2)(c) Prior to assembly of CRES nuts and studs and CRES washer/nut assemblies and studs, the stud threads must be coated with an anti-seize compound in accordance with MIL-T-22361.

1.b.(3) Utilizing a rubber mallet, lightly strike the washer to ascertain tightness of the nut and correct deficiencies (see Figure 1).

PROCEDURE (Cont’d)

MS NO. 6350-081-006 REV E CHG-8 Page 5 of 9

1.b.(4) Loose, cracked, broken, or missing nuts or washers are not acceptable. Threads must meet the requirements of Attachment 8 Step 1.e.(2).

1.b.(5) Broken or missing studs are not acceptable. Threads must meet the requirements of Attachment 8 Step 1.e.(2). Replace broken or missing studs in accordance with Reference (a). Report tiles removed for unsatisfactory studs in Attachment 1 Column B, E, or H (as appropriate).

1.b.(6) Evidence of damage or destruction due to heat from welding or burning is not acceptable. Report tiles removed for unsatisfactory condition in Attachment 1 Column D, G, or J (as appropriate).

1.b.(7) Gaps between nut and/or washer and damping tile or constraining/restraining layer are not acceptable.

1.c. For all areas, if missing or removed damping tile accounts for 10 percent or less of the damped area, installation of new tiles is not necessary. Specific areas listed in Step 1.c.(1) through Step 1.c.(4) below have alternate allowances for missing damping as indicated.

1.c.(1) For SSN688 Class submarines (SSN719 AFS only), MBTs Frame 26 and forward, if missing or removed damping tile accounts for 33 percent or less of the damped area, installation of new tiles is not necessary.

1.c.(2) For SSN688 Class submarines (SSN719 AFS only), forward trim tank, if missing or removed damping tile accounts for 33 percent or less of the damped area, installation of new tiles is not necessary.

1.c.(3) For SSN688 Class submarines, MBT 3, Frame 26 through 31, non-pressure hull plating and framing, damping need not be replaced.

1.c.(4) For SSN688 Class submarines (SSN688 through SSN750 only), sail structure damping, exclusive of mechanical equipment foundations, need not be replaced.

1.d. Corrosion:

NOTE 9: The tile inspector must be aware of the Reference (b), Reference (c), and Reference (d) interactions with the technical requirements of this MS.

1.d.(1) Inspect the underlying structure in way of missing or removed tiles and the steel between and around the tiles, in accordance with Reference (c) or Reference (d), as applicable. This is to determine if additional tiles need to be removed for further evaluation of the underlying structure. For tiles not removed but rust bleeding from under the tile or fastener is present, a structural inspector must determine that the material condition under the tiles is adequate in accordance with Reference (c) or Reference (d), as applicable. This inspection must be coordinated with the Reference (c) inspection when it is authorized.

1.d.(2) If excessive rust bleeding, corrosion products, deformed and/or lifting tiles are found, the tiles must be removed to determine the material condition of the underlying structure in accordance with Reference

(c) or Reference (d), as applicable. Excessive rust bleeding is defined as rust bleeding from a fastener or from behind a tile. Rust staining by itself is not considered excessive, but debonded tile or evidence of paint failure under the tile is reason for tile removal. Report tiles removed for debonding or evidence of paint failure or corrosion under the tile in Attachment 1 Column C, F, or I (as appropriate).

1.d.(3) Repair structural defects in accordance with Reference (c), Reference (d), and Reference (e), as applicable.

1.d.(4) Represervation, including coating evaluations, must be in accordance with Reference (b).

1.d.(5) Visually inspect the restraining/constraining studs, nuts, and washers for evidence of corrosion (rust) or deterioration. If there is evidence of corrosion or deterioration, correct deficiencies.

1.e. Reporting. Submit Attachment 1 under cover letter to NAVSEA 05U7T and SUBMEPP Code 1844 upon completion of this MS.

MS NO. 6350-081-006 REV E CHG-8 Page 6 of 9

Table 1. Exterior Sound Damping Inspections

Area Inspection Points

Bow Free Flood Access Trunk to GRP Dome 1MBT 1A and 1B 1MBT 2A and 2B 1MBT 3A and 3B

MBT 1A and 1B Bulkhead Frames 9, 10, and 11

1MBT 1A and 1B 1MBT 2A and 2B 1MBT 3A and 3B

Non-Pressure Hull Frames 12, 13, and 14

1MBT 1A and 1B 1MBT 2A and 2B 1MBT 3A and 3B

Non-Pressure Hull Plating Frames 11-30

1MBT 1A and 1B 1MBT 2A and 2B 1MBT 3A and 3B

Main Ballast Tank Bulkhead 15 and Non-Pressure Hull Frame 16

1MBT 1A and 1B 1MBT 2A and 2B 1MBT 3A and 3B

Main Ballast Tank Bulkhead 20 and Non-Pressure Hull Frame 21

1MBT 1A and 1B 1MBT 2A and 2B 1MBT 3A and 3B

Non-Pressure Hull Frames 17, 18, and 19 Frames 22, 23, and 24 Frames 25, 26, and 27

1MBT 1A and 1B 1MBT 2A and 2B 1MBT 3A and 3B

Center Line Longitudinal Bulkhead Frames 11-15 Frames 16-27

1Fairwater/Sail 2Fairwater/Sail Plating Frames 43-52 1Fairwater/Sail Fairwater Frames 1Fairwater/Sail Fairwater Flats MBT 4A and 4B MBT 5A and 5B Aft Free Flood

Non-Pressure Hull Frames 126, 127, 128, and 129 Frames 132, 133, 134, 135, 136, 137, 138, 139, and 140

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

MBT Bulkhead 131 and Frame 130

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

MBT Bulkhead Frame 142 and 143

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

Non-Pressure Hull Plating Frames 126-131 Frames 131-142

FOR OFFICIAL USE ONLY

PROCEDURE (Cont’d)

1. See Step 1.c. for detailed information.

2. Areas in way of voids, high frequency projectors, composite non-watertight access covers, acoustic window, and side lights are not damped.

MS NO. 6350-081-006 REV E CHG-8 Page 7 of 9

Table 1. Exterior Sound Damping Inspections (Cont'd)

Area Inspection Points

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

MBT Baffles

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

Centerline MBTs Bulkhead Frames 127-142

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

Longitudinal Bulkhead and Stringers Frames 127-142

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

Anchor Bolster Hawser and Chain Pipe

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

Stabilizer Structure

MBT 4A and 4B MBT 5A and 5B Aft Free Flood

Shaft Tube Bearing Support

Misc Freefloods/Structure VLS Hatches (SSN719-773) Weapon Shipping Hatch Fairing Cover Forward Escape Hatch Fairing Cover Aft Escape Hatch Fairing Cover

Misc Freefloods/Structure Stiffener Flanges on Eyebrow Hinged Cleat Recess Frames 20-26

Misc Freefloods/Structure Capstan Insert Frames 27-28

Misc Freefloods/Structure Torpedo Tube Recess NOTE: Areas in way of BQN-3 enclosure and low frequency sonar array are not damped.

Misc Freefloods/Structure Retractable Bow Planes Recess Area (SSN751-773)

Misc Freefloods/Structure Secondary Propulsion Motor Recess Structure

Table 2. Drawing Applicability and Interior Damping Installed

Title NAVSEA Drawings Ship Applicability

Sound Damping Interior Pressure Hull Fwd Fr65 607-4403214 SSN688-717, 719-720

Sound Damping Interior Pressure Hull Fwd Fr65 607-5589126 SSN718, 721-725, 750

Sound Damping Interior Pressure Hull Fwd Fr65 607-5858014 SSN751 and later

Sound Damping Interior Pressure Hull Aft Fr65 607-4555418 SSN688-763

MS NO. 6350-081-006 REV E CHG-8 Page 8 of 9

Table 2. Drawing Applicability and Interior Damping Installed (Cont'd)

Title NAVSEA Drawings Ship Applicability

Sound Damping In Way of Bedplates and Misc Fittings 607-4498827 SSN688-717, 719-720

Sound Damping In Way of Bedplates and Misc Fittings 607-5588283 SSN718, 721 and later

List of Fans and Pipe Hangers Requiring Sound Damping 607-4556688 SSN688-725, 750

List of Fans and Pipe Hangers Requiring Sound Damping 607-5940295 SSN751 and later

1.f. If tiles are missing, loose, deformed, or damaged and account for greater than the criteria of Step 1.c. of this MS, the missing, loose, or damaged damping material must be replaced in accordance with Reference (a), except as noted in Step 1.g. Preservation must be in accordance with Reference (b).

1.g. For Type II, Class 1 (color coded blue), Type V, Class 2 (color coded orange), and Type II, Class 2 (color coded white - with no steel constraining sheets) tiles only, tiles may be installed with 3M Corporation Very High Bond (VHB) tape number 4926. Tiles installed using VHB tape must be installed in accordance with Reference (a), as amended by UIPI 9802-105.

Table 3. Drawing Applicability Index

Ship Applicability Area NAVSHIPS/NAVSEA Drawings

SSN688-696

3Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-4554148(D) 607-4403215(S) 607-4556175(G) 607-4403215(S)

SSN697-703

3Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-4554148(D) 607-4403215(S) 607-4637689(E) 607-4403215(S)

SSN704-710

3Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-4554148(D) 607-5202431(B) 607-5202957(B) 607-5202431

SSN711

3Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-4554148(D) 607-4403215(S) 607-5198924(D) 607-4403215(S)

SSN712-718

3Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-4554148(D) 607-5202432(F) 607-5202433(F) 607-5202432

FOR OFFICIAL USE ONLY

3. Interior surfaces of composite, non-watertight access covers in the sail are not required to be damped.

MS NO. 6350-081-006 REV E CHG-8 Page 9 of 9

Table 3. Drawing Applicability Index (Cont'd)

Ship Applicability Area NAVSHIPS/NAVSEA Drawings

SSN719-720

4Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-4554148(D) 607-5580198(C) 607-5580197(B) 607-5564049

SSN721-725 and 750 4Sail

Exterior Pressure Hull Non Pressure Hull

607-4554148(D) 607-5754854(F) 607-5754852(J)

SSN751-763

4Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-5858013(A) 607-5940298(J) 607-5754852(J) 607-5940298(J)

SSN764-773

4Sail Exterior Pressure Hull Non Pressure Hull

Eyebrow Stiffener Flanges

607-5858013(A) 607-5940298(J) 607-5754852(J) 607-5940298(J)

FOR OFFICIAL USE ONLY

4. Interior surfaces of composite, non-watertight access covers in the sail are not required to be damped.

MS NO. 6350-081-006 REV E CHG-8 Page 1 of 16

MBT Damping Tile Feedback Form

Instructions

(1) Complete the form with information from the specific hull and availability being worked.

(2) Include number of all tiles removed during an availability, including tiles damaged during blasting and preservation work in a tank.

(3) Report only MBT data.

(4) The same information is being gathered for 3 different categories of installation methods: 1) Damping Tile with Steel Restraining Layer, 2) Damping Tile with Non-Steel Restraining Layer, and 3) Damping Tile with no Restraining Layer.

(5) For each category, indicate how many tiles will be removed for each failure type.

If a tile qualifies for replacement for more than 1 failure type, it should be counted for each applicable failure type (up to 3 times).

(6) Columns B, E, and H reflect tile removal due to stud, nut, washer, and/or nut/ washer assembly failure.

(7) Columns C, F, and I reflect tile removal due to substrate (structure under the tile) corrosion or preservation system failure.

(8) Columns D, G, and J reflect tile removal due to damping tile and/or restraining/ constraining layer failure. This column is divided into 2 sub-columns to allow activities to differentiate between tiles damaged in service (“As Found”) and tiles damaged due to maintenance work in the tank (“Maint”) such as blasting.

(9) Column K reflects the number of tiles noted as missing when the tank was opened.

(10) The comments block is for any pertinent information in regard to the damping system in the tank. It could include localized failure that can be attributed to a single cause, large numbers of failures due to surface prep or other tank work, comments on the straining system, etc.

Attachment 1

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M S N O .6350-081-006

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Page of16

Hull #: Avail Date: Avail Type:

A

Damping Tile w/Steel Restraining/Constraining Layer

Damping Tile w/Non-Steel Restraining/ Constraining Layer

Damping Tile w/no Restraining/Constraining Layer

B C D E F G H I J K

# Tiles removed for

Unsat/ Missing Stud(s)

# Tiles removed for delamination or corrosion of substrate

# Tiles removed for tile damage

# Tiles removed for

Unsat/ Missing Stud(s)

# Tiles removed for delamination or corrosion of substrate

# Tiles removed for tile damage

# Tiles removed for

Unsat/ Missing Stud(s)

# Tiles removed for delamination or corrosion of substrate

# Tiles removed for tile damage

# Tiles missing when tank opened

Tank CRES Steel As Found Maint CRES Steel As

Found Maint CRES Steel As Found Maint

MBT

1A

MBT

1B

MBT

2A

MBT

2B

MBT

3A

MBT

3B

MBT

4A

MBT

4B

MBT

5A

MBT

5B

Comments:

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MS NO. 6350-081-006 REV E CHG-8 Page 3 of 16

Equipment Guide List and Maintenance Requirement Parts List

EQUIPMENT GUIDE LIST

IDENTIFICATION NO. APL

Exterior Vibration Damping (SSN688-718, 721-725, 750-770) (DAMPING EXT) None 479

MAINTENANCE REQUIREMENT PARTS LIST

DRAWING NO. NAVSHIPS dwg 607-4497751 (AA)

DESCRIPTION PIECE NO. QTY PART NO. 1M/C/S/I

Plastic vibration damping tile 1 A/R 4497751 PC 1 C

Plastic vibration damping tile 4 A/R 4497751 PC 4 C 2Plastic restraining layer 7 A/R 4497751 PC 7 C

Steel constraining layer 8 A/R 4497751 PC 8 C

Steel constraining layer 9 A/R 4497751 PC 9 C

Steel constraining layer 10 A/R 4497751 PC 10 C

Steel constraining layer 11 A/R 4497751 PC 11 C

Plastic vibration damping tile 36 A/R 4497751 PC 36 C

Rubber vibration damping tile 41 A/R 4497751 PC 41 C

Rubber vibration damping tile 42 A/R 4497751 PC 42 C

Aluminum constraining layer 45 A/R 4497751 PC 45 C 3Stud 47 - 4497751 PC 47 C 3Stud 48 - 4497751 PC 48 C 3Stud 49 - 4497751 PC 49 C 3Self-locking nut 51 - 4497751 PC 51 C 3Self-locking nut 52 - 4497751 PC 52 C 3Self-locking nut 53 - 4497751 PC 53 C 3Self-locking nut 54 - 4497751 PC 54 C

FOR OFFICIAL USE ONLY

Attachment 2

1. Mandatory/Contingency/Special Tool/Informational

2. PVC may be used in lieu of GRP in MBTs, freefloods, and superstructure.

3. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

Nuts must be hexagonal for 250 degree service in accordance with NASM25027. Washers must perform in accordance with ANSI-B-27.2.

MS NO. 6350-081-006 REV E CHG-8 Page 4 of 16

Equipment Guide List and Maintenance Requirement Parts List

EQUIPMENT GUIDE LIST

IDENTIFICATION NO. APL

Interior Vibration Damping (SSN688-718, 721-725, 750-770) None 480

MAINTENANCE REQUIREMENT PARTS LIST

DRAWING NO. NAVSHIPS dwg 607-4497751 (AA)

DESCRIPTION PIECE NO. QTY PART NO. 1M/C/S/I

Plastic vibration damping tile 1 A/R 4497751 PC 1 C

Plastic vibration damping tile 4 A/R 4497751 PC 4 C

Plastic restraining layer 7 A/R 4497751 PC 7 C

Steel constraining layer 8 A/R 4497751 PC 8 C

Steel constraining layer 9 A/R 4497751 PC 9 C

Steel constraining layer 10 A/R 4497751 PC 10 C

Steel constraining layer 11 A/R 4497751 PC 11 C

Plastic vibration damping tile 36 A/R 4497751 PC 36 C

Rubber vibration damping tile 41 A/R 4497751 PC 41 C

Rubber vibration damping tile 42 A/R 4497751 PC 42 C

Aluminum constraining layer 45 A/R 4497751 PC 45 C 2Stud 47 - 4497751 PC 47 C 2Stud 48 - 4497751 PC 48 C 2Stud 49 - 4497751 PC 49 C 2Self-locking nut 51 - 4497751 PC 51 C 2Self-locking nut 52 - 4497751 PC 52 C 2Self-locking nut 53 - 4497751 PC 53 C 2Self-locking nut 54 - 4497751 PC 54 C

FOR OFFICIAL USE ONLY

Attachment 3

1. Mandatory/Contingency/Special Tool/Informational

2. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 5 of 16

Equipment Guide List and Maintenance Requirement Parts List

EQUIPMENT GUIDE LIST

IDENTIFICATION NO. APL

Exterior Vibration Damping (SSN719 and 720) (DAMPING EXT) None 479

MAINTENANCE REQUIREMENT PARTS LIST

DRAWING NO. NAVSHIPS dwg 607-5483926 (A)

DESCRIPTION PIECE NO. QTY PART NO. 1M/C/S/I

Plastic vibration damping tile 1 A/R 5483926 PC 1 C

Plastic vibration damping tile 2 A/R 5483926 PC 2 C

Plastic vibration damping tile 3 A/R 5483926 PC 3 C

Plastic vibration damping tile 4 A/R 5483926 PC 4 C

Plastic vibration damping tile 5 A/R 5483926 PC 5 C

Plastic vibration damping tile 6 A/R 5483926 PC 6 C 2Plastic restraining layer 7 A/R 5483926 PC 7 C

Steel constraining layer 8 A/R 5483926 PC 8 C

Steel constraining layer 9 A/R 5483926 PC 9 C

Steel constraining layer 10 A/R 5483926 PC 10 C

Steel constraining layer 11 A/R 5483926 PC 11 C

Steel constraining layer 12 A/R 5483926 PC 12 C 3Stud 13 - 5483926 PC 13 C 3Stud 14 - 5483926 PC 14 C 3Stud 15 - 5483926 PC 15 C 3Stud 16 - 5483926 PC 16 C 3Stud 17 - 5483926 PC 17 C 3Self-locking nut 18 - 5483926 PC 18 C 3Self-locking nut 19 - 5483926 PC 19 C 3Self-locking nut 20 - 5483926 PC 20 C

FOR OFFICIAL USE ONLY

Attachment 4

1. Mandatory/Contingency/Special Tool/Informational

2. PVC may be used in lieu of GRP in MBTs, freefloods, and superstructure.

3. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 6 of 16

MAINTENANCE REQUIREMENT PARTS LIST (Cont'd)

DRAWING NO. NAVSHIPS dwg 607-5483926 (A) (Cont'd)

DESCRIPTION PIECE NO. QTY PART NO. 4M/C/S/I

5Self-locking nut 21 - 5483926 PC 21 C 5Self-locking nut 22 - 5483926 PC 22 C

Plastic vibration damping tile 36 A/R 5483926 PC 36 C

Plastic vibration damping tile 37 A/R 5483926 PC 37 C

Plastic vibration damping tile 38 A/R 5483926 PC 38 C

Rubber vibration damping tile 41 A/R 5483926 PC 41 C

Rubber vibration damping tile 42 A/R 5483926 PC 42 C

Aluminum constraining layer 45 A/R 5483926 PC 45 C

FOR OFFICIAL USE ONLY

Attachment 4

4. Mandatory/Contingency/Special Tool/Informational

5. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 7 of 16

Equipment Guide List and Maintenance Requirement Parts List

EQUIPMENT GUIDE LIST

IDENTIFICATION NO. APL

Interior Vibration Damping (SSN719 and 720) None 471

MAINTENANCE REQUIREMENT PARTS LIST

DRAWING NO. NAVSHIPS dwg 607-5483926 (A)

DESCRIPTION PIECE NO. QTY PART NO. 1M/C/S/I

Plastic vibration damping tile 1 A/R 5483926 PC 1 C

Plastic vibration damping tile 2 A/R 5483926 PC 2 C

Plastic vibration damping tile 3 A/R 5483926 PC 3 C

Plastic vibration damping tile 4 A/R 5483926 PC 4 C

Plastic vibration damping tile 5 A/R 5483926 PC 5 C

Plastic vibration damping tile 6 A/R 5483926 PC 6 C

Plastic restraining layer 7 A/R 5483926 PC 7 C

Steel constraining layer 8 A/R 5483926 PC 8 C

Steel constraining layer 9 A/R 5483926 PC 9 C

Steel constraining layer 10 A/R 5483926 PC 10 C

Steel constraining layer 11 A/R 5483926 PC 11 C

Steel constraining layer 12 A/R 5483926 PC 12 C 2Stud 13 - 5483926 PC 13 C 2Stud 14 - 5483926 PC 14 C 2Stud 15 - 5483926 PC 15 C 2Stud 16 - 5483926 PC 16 C 2Stud 17 - 5483926 PC 17 C 2Self-locking nut 18 - 5483926 PC 18 C 2Self-locking nut 19 - 5483926 PC 19 C 2Self-locking nut 20 - 5483926 PC 20 C 2Self-locking nut 21 - 5483926 PC 21 C

FOR OFFICIAL USE ONLY

Attachment 5

1. Mandatory/Contingency/Special Tool/Informational

2. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 8 of 16

MAINTENANCE REQUIREMENT PARTS LIST (Cont'd)

DRAWING NO. NAVSHIPS dwg 607-5483926 (A) (Cont'd)

DESCRIPTION PIECE NO. QTY PART NO. 3M/C/S/I

4Self-locking nut 22 - 5483926 PC 22 C

Plastic vibration damping tile 36 A/R 5483926 PC 36 C

Plastic vibration damping tile 37 A/R 5483926 PC 37 C

Plastic vibration damping tile 38 A/R 5483926 PC 38 C

Rubber vibration damping tile 41 A/R 5483926 PC 41 C

Rubber vibration damping tile 42 A/R 5483926 PC 42 C

Aluminum constraining layer 45 A/R 5483926 PC 45 C

FOR OFFICIAL USE ONLY

Attachment 5

3. Mandatory/Contingency/Special Tool/Informational

4. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 9 of 16

Equipment Guide List and Maintenance Requirement Parts List

EQUIPMENT GUIDE LIST

IDENTIFICATION NO. APL

Exterior Vibration Damping (SSN771-773) (DAMPING EXT) None 479

MAINTENANCE REQUIREMENT PARTS LIST

DRAWING NO. NAVSHIPS dwg 607-6398204 (A)

DESCRIPTION PIECE NO. QTY PART NO. 1M/C/S/I

Plastic vibration damping tile 1 A/R 6398204 PC 1 C

Plastic vibration damping tile 2 A/R 6398204 PC 2 C

Plastic vibration damping tile 3 A/R 6398204 PC 3 C

Plastic vibration damping tile 4 A/R 6398204 PC 4 C

Plastic vibration damping tile 5 A/R 6398204 PC 5 C

Plastic vibration damping tile 6 A/R 6398204 PC 6 C 2Plastic restraining layer 7 A/R 6398204 PC 7 C

Steel constraining layer 8 A/R 6398204 PC 8 C

Steel constraining layer 9 A/R 6398204 PC 9 C

Steel constraining layer 10 A/R 6398204 PC 10 C

Steel constraining layer 11 A/R 6398204 PC 11 C

Steel constraining layer 12 A/R 6398204 PC 12 C

Plastic vibration damping tile 36 A/R 6398204 PC 36 C

Plastic vibration damping tile 37 A/R 6398204 PC 37 C

Plastic vibration damping tile 38 A/R 6398204 PC 38 C

Rubber vibration damping tile 41 A/R 6398204 PC 41 C

Rubber vibration damping tile 42 A/R 6398204 PC 42 C

Aluminum constraining layer 45 A/R 6398204 PC 45 C 3Stud 47 - 6398204 PC 47 C 3Stud 48 - 6398204 PC 48 C

FOR OFFICIAL USE ONLY

Attachment 6

1. Mandatory/Contingency/Special Tool/Informational

2. PVC may be used in lieu of GRP in MBTs, freefloods, and superstructure.

3. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 10 of 16

MAINTENANCE REQUIREMENT PARTS LIST (Cont'd)

DRAWING NO. NAVSHIPS dwg 607-6398204 (A) (Cont'd)

DESCRIPTION PIECE NO. QTY PART NO. 4M/C/S/I

5Stud 49 - 6398204 PC 49 C 5Stud 50 - 6398204 PC 50 C 5Self-locking nut 51 - 6398204 PC 51 C 5Self-locking nut 52 - 6398204 PC 52 C 5Self-locking nut 53 - 6398204 PC 53 C 5Self-locking nut 54 - 6398204 PC 54 C

FOR OFFICIAL USE ONLY

Attachment 6

4. Mandatory/Contingency/Special Tool/Informational

5. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 11 of 16

Equipment Guide List and Maintenance Requirement Parts List

EQUIPMENT GUIDE LIST

IDENTIFICATION NO. APL

Interior Vibration Damping (SSN771-773) None 472

MAINTENANCE REQUIREMENT PARTS LIST

DRAWING NO. NAVSHIPS dwg 607-6398204 (A)

DESCRIPTION PIECE NO. QTY PART NO. 1M/C/S/I

Plastic vibration damping tile 1 A/R 6398204 PC 1 C

Plastic vibration damping tile 2 A/R 6398204 PC 2 C

Plastic vibration damping tile 3 A/R 6398204 PC 3 C

Plastic vibration damping tile 4 A/R 6398204 PC 4 C

Plastic vibration damping tile 5 A/R 6398204 PC 5 C

Plastic vibration damping tile 6 A/R 6398204 PC 6 C

Plastic restraining layer 7 A/R 6398204 PC 7 C

Steel constraining layer 8 A/R 6398204 PC 8 C

Steel constraining layer 9 A/R 6398204 PC 9 C

Steel constraining layer 10 A/R 6398204 PC 10 C

Steel constraining layer 11 A/R 6398204 PC 11 C

Steel constraining layer 12 A/R 6398204 PC 12 C

Plastic vibration damping tile 36 A/R 6398204 PC 36 C

Plastic vibration damping tile 37 A/R 6398204 PC 37 C

Plastic vibration damping tile 38 A/R 6398204 PC 38 C

Rubber vibration damping tile 41 A/R 6398204 PC 41 C

Rubber vibration damping tile 42 A/R 6398204 PC 42 C

Aluminum constraining layer 45 A/R 6398204 PC 45 C 2Stud 47 - 6398204 PC 47 C 2Stud 48 - 6398204 PC 48 C

FOR OFFICIAL USE ONLY

Attachment 7

1. Mandatory/Contingency/Special Tool/Informational

2. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 12 of 16

MAINTENANCE REQUIREMENT PARTS LIST (Cont'd)

DRAWING NO. NAVSHIPS dwg 607-6398204 (A) (Cont'd)

DESCRIPTION PIECE NO. QTY PART NO. 3M/C/S/I

4Stud 49 - 6398204 PC 49 C 4Stud 50 - 6398204 PC 50 C 4Self-locking nut 51 - 6398204 PC 51 C 4Self-locking nut 52 - 6398204 PC 52 C 4Self-locking nut 53 - 6398204 PC 53 C 4Self-locking nut 54 - 6398204 PC 54 C

FOR OFFICIAL USE ONLY

Attachment 7

3. Mandatory/Contingency/Special Tool/Informational

4. Material for replacement studs, nuts, and washers must be CRES. Studs must be type 316L (UNS No.

S31603) in accordance with MIL-S-24149. Because 316L possesses superior corrosion properties, nuts and washers should also be 316L; however, for nuts and washers only, if 316L is not available, 316 may be used.

MS NO. 6350-081-006 REV E CHG-8 Page 13 of 16

Applicable Steps of General Acceptance Criteria (GAC)

NOTE : This attachment contains only those steps from MS No. 7650-081-001H CHG-5, General Acceptance Criteria, that are necessary to accomplish the inspections required by this MS. A list of definitions is located at the end of this attachment.

1. General acceptance criteria

TECHNICAL REFERENCE DATA

(a) Submarine Fastening Criteria NAVSEA S9505-AM-GYD-010

1.e. Threaded fasteners (including self-locking fasteners and locking elements), Acme threads, and tapped (bolt) holes:

NOTE 26: Except for threads covered by pressure and non-pressure hull tapped hole inspections, removal of threaded fasteners or thread inserts only to determine acceptability of threads is not required.

NOTE 27: Reinstallation of studs with anaerobic sealant must be in accordance with recommended vendor procedures or approved local overhaul facility procedures.

NOTE 28: Threads should be cleaned before applying these acceptance criteria.

NOTE 29: Thread requirements apply to the load bearing portions of the fastener only. Defects are acceptable on the free end of the fastener only if they cannot cause damage to the engaging threads.

NOTE 30: Except for low-alloy and carbon steels above 1000°F or other fastener materials above 670°F, continued use of silver plated fasteners when the silver plating is worn is acceptable, provided that anti-galling (compound) lubricant per CID A-A-59004 (Molykote P-37 paste), is applied to the threads.

NOTE 31: Steam turbine fasteners with original copper plating disturbed need not be replated or replaced, provided anti-galling (compound) lubricant per CID A-A-59004 (Molykote P-37 paste) is used.

Except for low-alloy and carbon steels above 1000°F or other fastener materials above 670°F, if replacement fasteners are necessary, they need not be copper plated, provided anti-galling (compound) lubricant per CID A-A-59004 (Molykote P-37 paste) is used.

NOTE 32: Reference (a) should be used for repair, installation, and replacement of threads and fasteners.

Attachment 8

MS NO. 6350-081-006 REV E CHG-8 Page 14 of 16

NOTE 33: “Type I” and “Type II” inspections as found in the GAC, serve only to identify different levels of inspection. “Definitions” of Type I and Type II have not been provided to avoid defining or guiding the level of inspection required, and to avoid the potential misapplication of the GAC requirements. It is intended that engineering or technical individuals invoke Type I, Type II, or an alternate fastener inspection level, depending on the specific application. AType I inspection is typically used for pressure containing and critical thread SUBSAFE applications, LEVEL 1 applications, and other pressure containing applications. Type I fastener criteria is also normally applied to fasteners for which a torque requirement is also specified in the associated maintenance standard. AType II inspection is typically used for non-critical applications. An engineering evaluation of the loads in the joint can result in exceptions to this general usage; for example, a Type II thread inspection is currently authorized for LEVEL 1 pressure containing pump cover fasteners in the SUBSAFE SSN688Cl Byron Jackson MSW pump.

NOTE 34: During an overhaul period, it is not necessary to replace the nylon locking pellets in male self-locking fasteners that were originally assembled with new locking pellets if the fastener is subsequently required to be disassembled to support shipboard installation/reassembly of the component or grooming/maintenance of the component.

1.e.(2) Type II threaded fasteners (including self-locking fasteners and locking elements) and tapped (bolt) holes:

1.e.(2)(a) Visible cracks are not acceptable.

1.e.(2)(b) Thread defects that do not go beyond the thread root diameter are acceptable provided total surface of all engaged threads is not reduced more than 10 percent as estimated visually.

1.e.(2)(c) Clearance fit threads must engage by hand.

1.e.(2)(d) The locking insert (plug, patch, or chemical patch type) on externally threaded male fasteners should be replaced at each reuse. If logistic problems prohibit such replacement, they may be reused if the locking element generates a breakaway torque of at least 25 percent of the value listed for the appropriate size in Reference (a) Table 3-4.

In those cases where repair activities encounter insurmountable scheduling or logistics circumstances, and subsequently judge that the fastener must be reused without replacing the locking element, an anaerobic thread locking compound (such as ASTM D5363, AN0141 or AN0143) may be applied to allow future removal with just hand tools. (Example of “scheduling or logistics” problems: unscheduled repairs of components with installed male fasteners, lack of nylon stock, insufficient time to send patch fasteners to a qualified vendor, broken machine tools that are used to manufacture the insert, and so on.) Loctite should not be used with any thread lube/anti-galling compound. For SUBSAFE, LEVEL 1, pressure-containing, underwater explosion (undex) qualified applications, or where the drawing records a torque value, engineering should recalculate an acceptable torque using an estimated Loctite coefficient of friction (cf). For non-critical applications, torque Loctited fasteners to “wrench tight”.

Self-locking nuts must meet the requirements of Reference (a) Paragraph 3-37.e(1).

1.e.(2)(e) Ineffective wrench flats, drive slots, or spanner wrench slots are not acceptable.

MS NO. 6350-081-006 REV E CHG-8 Page 15 of 16

Definitions Acme Threads - a frequent thread choice for power transmission, yielding more efficiency than the typical machine thread, commonly known as a “V” thread. Although more difficult to machine, the Acme thread's basic screw geometry attributes to its lower losses, including friction, which in turn means less wear and ultimately longer life.

A “V” thread has an angle of 60 degrees between opposing faces, while the Acme is only 29 degrees.

Dynamic Radial Seal - an O-ring (or quad-ring) seal configuration where the parts being sealed are cylindrical, with one part contained within and concentric with the other, and subject to relative motion along the common cylinder axis. The direction of pressure is perpendicular to the plane containing the O-ring. Generally, the seal is constrained in the concentric space between the 2 sealed parts by means of a rectangular groove machined into the circumference of one of the mating sealing surfaces. Sealing is accomplished both by compression of the seal cross-section (squeeze) within the assembled gland and by some degree of pressure deformation of the seal into the gap between the sealed parts.

Note: For repairs and inspections, mating surfaces having relative motion must be considered static surfaces if the relative motion is intermittent with low frequency of operation and of 1 cycle or less. For example, the valve stem seal areas on valves that are normally operated only to accomplish specific system line-ups and are fully opened or closed when the stem is rotated 90 degrees (1/4 turn) should be considered static. All other areas are considered to be dynamic surfaces. Refer to NAVSEA-approved procedures for current brush plating requirements on static sealing and non-sealing surfaces.

Dynamic Surface - Dynamic surfaces are surface areas (sealing and non-sealing) that have relative motion with another part excluding mating surfaces where the relative motion is a slow rotation of less than 1 turn. The relative motion may be but is not limited to rubbing, sliding, hard intermittent contact, etc., as occurs in (but not limited to) the following:

1) Valve stem “O” ring seal area or groove (more than 1 turn required for valve operation)

2) Valve stem bore “O” ring seal area or groove (more than 1 turn required for valve operation)

3) Lift/swing check valve disc/clapper seat area

4) Snorkel head valve seat area

5) Diesel/air induction hull/backup valve flapper seat area

6) Operating shaft “V” packing seal area

7) Valve disc/seat contact areas

Hull Flange - a flange that is directly fastened to the pressure hull, and should failure occur, would allow uncontrollable flooding into the submarine.

Major Repairs - are those repairs that can potentially affect the structural integrity of a pressure-containing portion of a piping system or component. Examples of these repairs include most welding (“minor” welding repairs are defined in NAVSEA S9074-AR-GIB-010/278), brazing or other fabrication processes, including new mechanical joints in which a flange or union tailpiece is replaced using a weld or braze, and the installation of new pressure boundary parts or components which have not been previously strength tested.

MS NO. 6350-081-006 REV E CHG-8 Page 16 of 16

Definitions (Cont'd)

Minor Repairs - are repairs that do not qualify as “Major”. Examples include operations that could be considered maintenance such as replacing packing and pressure seal rings, lubricating, lapping or grinding seats, and replacing damaged parts such as stems and discs.

Non-hull Flange - A flange that is not a hull flange.

Static Face Seal - an O-ring seal where the O-ring groove is machined into the inner face of one of 2 mating flanges.

Pressure acts radially outward on the seal, tending to force the O-ring against the outer circumference of the groove.

Static Radial Seal - same configuration as that of a dynamic radial seal except that there is no relative motion between sealed parts.

Static Surface - Static surfaces are surface areas (sealing and non-sealing) that remain in stationary contact with their mating part/member.

Straight Thread Tube Fitting Boss Seal - an O-ring seal configuration designed to seal threaded connections, such as plugs or threaded tubes. The O-ring gland is created by the inner face of the plug or tube “boss” (the face in way of the part into which the male piece is threaded) and the chamfer machined into the outer edge of the tapped hole.

When the plug/tube is fully threaded into the mating hole, the O-ring is compressed into the semi-triangular shaped space thus formed, creating a seal. O-rings used in straight thread tube boss seals are often of higher durometer than those used in other applications.

Type I Fasteners - Type I fastener classification is determined by Engineering based on specific function and/or design. Generally included in this group are SUBSAFE fasteners, pressure boundary fasteners in Level I systems, and fasteners for which a torque requirement is specified in the associated maintenance standard.

Type II Fasteners - are determined by Engineering to not require Type I inspection criteria. Included in this group are those fasteners for which a torque requirement is not specified in the associated maintenance standard.

V-ring Packing Seals - a seal configuration where the parts being sealed are cylindrical, with one part contained within and concentric with the other. These parts are usually subject to relative motion along the common cylinder axis. The seal assembly is constrained by a machined groove in the outer sealing surface and held in place by an adapter flange. The seal assembly is made up of a male and female adapter between which are compressed several sealing rings that have a “vee” shaped cross-section. The direction of pressure is both perpendicular to the packing diameter and in a direction which tends to expand the “vee” packing rings against the sealing surface of the inner part. Consequently, sealing tends to be pressure activated.