S9245-A4-TSM-010_REV00 30_DEC_2018-Part(2).pdf

Figure B-62 SSN 774 Class - FOS ICCP Reference Cell Mounting Flange Painting Final Condition

S9245-A4-TSM-010

B-71

Figure B-63 SSN 774 Class - FWD Hydrophone Cover Painting at Vendor

B-72

Figure B-64 SSN 774 Class - FWD Hydrophone Cover Painting at Installation Activity

B-73

Figure B-65 SSN 774 Class - FWD Hydrophone Cover Painting Final Condition

B-74

Figure B-66 SSN 774 Class - Spare FWD Hydrophone Cover Painting at Vendor

B-75

Figure B-67 SSN 774 Class - Spare FWD Hydrophone Cover Painting at Installation Activity

B-76

Figure B-68 SSN 774 Class - Spare FWD Hydrophone Cover Painting Final Condition

B-77

NOTES for: Figures B-50 thru B-68. SSN 774 Class - Forward Outer Structure (FOS) Painting

1. Forward Outer Structure (FOS) Cover Plates:

a. FOS Cover Plate ID:

The FOS Cover Plate ID shall be prepared and painted in accordance with Paint System 2,Table 6-2.

Exposed surfaces of welded nuts shall be painted similar to adjacent surfaces and threads shall not be blasted or painted. Thru holes and vent holes shall be prepared and painted with Paint System 2,Table 6-2.

Exposed tile surfaces, including exposed tile attachment stud threads and nuts, are not required to be painted, but inadvertent overspray onto tile assembly is acceptable.

b. FOS Cover Plate OD:

FOS Cover Plate OD, including Tie Down Bars, shall be painted and prepared with the SHT Paint System in accordance withReference 1-2.eor 1-2.f, as applicable. All countersinks shall be painted with Paint System 2,Table 6-2with the exception of the countersinks in way of block anodes. Additionally, prior to the installation of the FOS Cover Plates, remove paint from the two (2) forward-most corner countersinks on each cover plate for electrical continuity required for low voltage anodes (a total of 4 countersinks per cover plate assembly; 2 on the large FWD cover plate, and 2 on the small AFT cover plate).

c. FOS Cover Plate Edges:

FOS Cover Plate Edges, including cable slots when present, shall be prepared and painted with Paint Sys-tem 2,Table 6-2.

2. Forward Outer Structure (FOS): a. FOS Hydrodynamic Surfaces:

a. FOS Hydrodynamic Surfaces: Prepare and paint the FOS hydrodynamic surfaces, including the Leading Edge Ring (LER), duct ID and thru hole in way of the ICCP Reference Cell shall be prepared and painted with Paint System 1,Table 6-1, with the exception of the faying surfaces for the Pc1A connection on the duct ID. The faying surfaces for the Pc1A/duct ID interface shall be painted with one (1) coat of MIL-D- TL-24441 F150 green primer and one (1) coat of MIL-DTL-24441 F153 dark gray only.

b. Faying Surfaces in way of FOS Cover Plates and the FWD/AFT Subassembly Mating Flange: Prepare and paint the FOS Cover Plate faying surfaces, including the LER rabbet, and the FWD/AFT Subassembly Mating Flange with Paint System 2,Table 6-2.

c. Thru Hole in FOS in way of FWD Hydrophone Cover:

Prepare and paint the ID of the thru hole with Paint System 2,Table 6-2.

3. FOS Cavity, Anode Studs, and Cable Spool Hardware:

a. FOS Cavity:

(1) At Vendor: The FOS Cavity shall be painted with one (1) coat of MIL-DTL-24441 F150 green primer, except for the Reference Cell faying surfaces (2 locations), and the FOS-to-AOS fastener thru holes, which shall be prepared and painted in accordance with Paint System 2,Table 6-2. Cable clips shall be painted with Paint System 2,Table 6-2, and hydrophone connector screws and nuts, and all spotfaces, shall be painted with one (1) coat of MIL-DTL-24441 F150 green primer.

(2) At Installation Activity:

After the AFT Subassembly has been connected to the FWD Subassembly and all mechanical work associated with the FWD/AFT Subassembly connection has been completed within the cavity, mask the cavity in accordance withFigures B-55andB-58 prior to blasting. The FWD hydrophone cover, ICCP Reference Cells, shims, cabling, and anodes and associated hardware (except welded studs) shall be removed from the cavity prior to preparing and painting the cavity. The welded stud threads, ICCP Reference Cell Mounting Plate threaded holes, syntactic blocks (if installed), and syntactic block attachment holes (if blocks are not installed) shall be protected from preparation and painting opera-tions. Then, all cavity surfaces, including stud welds, installed ICCP Reference Cell Mounting Plate (seeFigure B-62), and attachment hardware shall be prepared and painted with Paint System 5,Table 6-5. After final cure of Paint System 5,Table 6-5and upon completion of anode installation, prepare and paint anode straps and associated anode hardware in accordance withFigure B-69. After cable installation, prepare and paint cable clips, cable clip hardware, cable spool hardware, and associated exposed stud threads with either one (1) coat of MIL-DTL-24441 F150 green primer, Paint System 5, Table 6-5, or Paint System 6,Table 6-6(do not paint the Delrin cable spools). Exposed surfaces of the

B-78 installed syntactic blocks shall be abraded and painted with one (1) coat of MIL-DTL-24441 F150 green primer.

4. FWD Hydrophone Cover and Spare Cover (including the Hydrophone Foundation):

a. FWD Hydrophone Cover ID Surfaces (Duct ID Side): Prepare and paint hydrodynamic surfaces with Paint System 1,Table 6-1. Do not blast or paint thru holes, threaded holes, or countersinks.

b. FWD Hydrophone Cover OD Surfaces (FOS Cavity Side):

Prepare and paint the cover OD surfaces, including the Hydrophone Foundation OFF-HULL with Paint System 5,Table 6-5(OFF-HULL painting required to avoid sealing the cover to the FOS cavity, making it difficult to remove in the future). Do not blast or paint thru holes, threaded holes, countersinks, or the faying surface of the hydrophone cover. The faying surfaces of the Hydrophone Foundation, including in way of Hydrophone Foundation attachment fastener heads, shall be prepared and painted with one (1) coat of MIL-DTL-24441 F150 green primer.

c. FWD Hydrophone Cover Circumferential Edge:

Prepare and paint edge with Paint System 2,Table 6-2.

5. FOS in way of FWD Hydrophone Cover:

Prepare and paint the ID of the thru hole in FOS in way of Forward Hydrophone Cover circumferential edge with Paint System 2,Table 6-2. The faying surface in way of the Hydrophone Cover shall not be blasted or painted, except when installing the Spare FWD Hydrophone Cover. When installing the Spare FWD Hydro-phone Cover, the areas not in way of the Shim faying surfaces shall be painted with Paint System 2,Table 6-2.

6. Fasteners:

a. All Fasteners (except for FOS coverplate attachment fasteners) and Nuts:

(1) Prior to installation: The fastener heads and nuts shall be abrasive blasted and painted with one coat of MIL-DTL- 24441 Ty IV F150 green primer prior to installation. The socket openings on the fasteners shall be prepared and painted to the maximum extent practicable. Faying surfaces of fasteners shall not be blasted or painted. Fastener threads and ends shall not be prepared or painted prior to installation.

(2) After installation of the primed fasteners: The primed fastener head shall be cleaned, roughened with 80-120 grit paper, and re-cleaned and painted with the remaining required coats similar to the adjacent surfaces.

b. FOS Cover Plate Attachment Fasteners:

The fastener heads shall be prepared and painted in accordance with NAVSEA 245-7383869.

(1) Prior to installation:

The heads of the fasteners shall be abrasive blasted and painted with the primer coat of the SHT Paint System, defined inReference 1-2.eor 1-2.f, as applicable, prior to installation. The socket openings on the fasteners shall be prepared and painted to the maximum extent practicable. The faying surfaces of the fastener heads shall not be blasted or painted. Fastener threads shall not be prepared or painted prior to installation.

(2) After installation of fasteners:

After fastener installation, DFT measurements on touch-up paint on the installed fasteners are not required. The primed fastener head shall be cleaned, roughened with 80-120 grit paper, and re-cleaned prior to applying 2nd coat of the SHT Paint System, defined inReference 1-2.eor 1-2.f, as applicable, and grooming. Upon completion of required grooming, the groomed fastener heads, shall be painted with the remaining required coats similar to the adjacent surfaces.

c. FWD Hydrophone Cover Fasteners:

After installation of the hydrophone cover attachment fasteners, the primed fastener head shall be cleaned, roughened with 80-120 grit paper, and re-cleaned prior to applying 2nd coat of AC paint and groomed with PR-944-F. Upon completion of required grooming, the groomed fastener head surfaces shall be painted with the remaining required coats similar to the adjacent surfaces.

B-79

d. Syntactic Block Attachment Fasteners:

Ensure that the heads and unthreaded shank of the cap screws are painted with one (1) coat of MIL-DTL- 24441 F150 green primer.

e. Fastener Paint to be Restored in Place (No Fastener Removal or Replacement):

For in-place repair of fastener paint, exposed fastener heads shall be prepared prior to restoration of paint.

The exposed surfaces shall be prepared and painted with the remaining required coats similar to adjacent surfaces.

7. Painting of Incompressible Wedges (ICW) and Fairing Materials:

ICW shall be applied in accordance with the ICW installation drawing (245-7383869). Following ICW and fairing installation, the surface shall be prepared in accordance withReference 1-2.eor 1-2.f. The appropri-ate tack coat shall be applied based on the underlying substrate. In way of ICW and DTRC-2844-1102 epoxy, apply 2-3 mils DFT of Amercoat 3273 flexible epoxy. On all other surfaces, apply 1-2 mils DFT of MIL-DTL- 24441 F151. Following the appropriate tack coat, two coats of Interspeed 642 Black AF shall be applied at 4-6 mils DFT for each layer.

B-80

Figure B-69 SSN 774 Class - Typical Passive Anode (LSS-10-CT) Installation Painting

B-81

NOTES for: Figure B-69. SSN 774 Class - Typical Passive LSS-CT-10 Anode Installation Painting

1. Anodes, including Anode Straps:

Low voltage anodes shall NOT be prepared or painted. After installation, exposed strap surfaces shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer with adjacent exposed stud thread and nut surfaces.

2. Anode Spacers:

Prior to installation, all anode spacer surfaces, ID and OD, shall be abrasive blasted and painted with Paint System 2,Table 6-2. Epoxy powder coating may be applied to the anode spacers in lieu of Paint System 2.

The coating shall be applied in accordance with UIPI 0631-901 using powders qualified to MIL-PRF-23236 Type VIII, Class 7. Total DFT range for powder coating shall be 9-18 mils.

3. Anode Nuts:

a. Prior to installation, the anode nut surfaces which will be exposed after installation shall be abrasive blasted and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer off-hull. The faying surfaces, self-locking ring elements and threads of the nut shall not be blasted or painted.

b. After installation, the exposed anode nut surfaces shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer with adjacent exposed stud thread and anode strap surfaces.

4. Anode Lock washers:

Lock washers shall NOT be prepared or painted.

5. Anode Stud:

a. Prior to installation of the anodes, the stud welds shall be prepared and painted with adjacent cavity sur-faces. The stud threads shall be protected from preparation and painting operations.

b. After installation of the anodes, the exposed stud threads shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer with adjacent exposed nut and anode strap surfaces.

c. Anodes, including Anode Straps:

Low voltage anodes shall NOT be prepared or painted. After installation, exposed strap surfaces shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer with adjacent exposed stud thread and nut surfaces.

6. Anodes, including Anode Straps:

Low voltage anodes shall NOT be prepared or painted. After installation, exposed strap surfaces shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer with adjacent exposed stud thread and nut surfaces.

B-82

Figure B-70 SSN 774 Class - SSN 790 HyDem IAH Aft Duct Painting Except for in Way of ICCP Compo-nents / Hydrophone Cavities

B-83

NOTES for: Figure B-70. SSN 774 Class - SSN 790 HyDem IAH Aft Duct Painting Except for in Way of ICCP Components / Hydrophone Cavities

1. Do not blast or paint threaded holes.

2. In Aft Duct Syntactic Bays, local deterioration of F150 green primer in way of interior weld joints is accept-able.

3. The ID surfaces of the external ICCP conduits (not shown) shall be painted with Paint System 2,Table 6-2 for a minimum distance of six diameters from the forward open end of the conduits (i.e., a minimum distance of 2.538”). All three coats of Paint System 2,Table 6-2shall be applied on a best effort basis, by any reason-able means (i.e., brush, sponge, spray, etc.). There shall be no requirement for paint thickness measurement (either DFT, WFT, between coats or total) in this area. In lieu of abrasive blasting, 60-80 grit sandpaper may be substituted for the preparation of the conduit ID. Drying times as specified inReference 1-2.gshall be adhered to prior to any cable fitting or installation. Any paint that is scuffed, abraded, or removed from the ID surfaces of the conduits after cable trial fit does not need to be restored or touched up. Both the conduit ID paint and the paint applied to the forward facing edge of the conduit shall be applied after any grinding or welding (hot work) on or near the Aft Outer Structure (AOS)/conduit joint. In addition, the paint on the adja-cent surfaces on both the OD surface and forward face surface of the AOS shall be touched up as required.

B-84

Figure B-71 SSN 774 Class - SSN 790 HyDem IAH Aft Duct Painting in Way of Hydrophone Cavities at Ven-dor

B-85

NOTES for: Figure B-71. SSN 774 Class - SSN 790 HyDem IAH Aft Duct Painting in Way of Hydro-phone Cavities at Vendor

1. Do not blast or paint threaded holes.

2. SeeFigure B-69for painting requirements for the low voltage anode spacer, anode strap, nut, and exposed stud surfaces. Do not blast or paint the low voltage anode or lock washer.

3. Thru holes (vent holes and lifting & handling holes) in the hydrophone cover shall be prepared and painted with Paint System 1,Table 6-1.

4. Longitudinal edges of the hydrophone cover shall receive Paint System 1,Table 6-1.

5. Prior to installation of the tile system on the hydrophone cover, stud welds shall be prepared and painted with Paint System 1,Table 6-1, same as the cover ID. Do not blast or paint stud threads.

a. After installation of the tile system on the hydrophone cover, do not paint the tile system, but inadvert-ent overspray is acceptable.

6. Blasting or painting the inside diameter of the hydrophone conduits is not required, but inadvertent overspray is acceptable.

7. Anode stud welds (not shown) shall be prepared and painted with Paint System 5,Table 6-5, same as the rest of the hydrophone cavity. Do not blast or paint the stud threads.

8. Cable clip stud welds (not shown) and the portions of the stud below the collar, shall be prepared and painted with Paint System 5,Table 6-5. Do not blast or paint the stud threads.

9. The cable clip (not shown) shall be blasted and painted with Paint System 2,Table 6-2.

10. Fasteners for attachment of hydrophone cover plate (not shown) and attachment of hydrophone mount shall be abrasive blasted and painted one coat of Mil-DTL-24441 TyIV F150 green primer on surfaces that will be exposed after installation. Do not blast or paint threaded areas or faying surfaces.

11. Faying surfaces of hydrophone mount shall receive one coat of Mil-DTL-24441 TyIV F150 green primer.

12. After welding of nuts to cover ID, abrasive blast and paint exposed surfaces of the nut with Paint System 2, Table 6-2. Do not blast or paint threads or nut self-locking elements.

13. In Aft Duct Syntactic Bays, local deterioration of F150 green primer in way of weld joints is acceptable.

B-86

Figure B-72 SSN 774 Class - SSN 790 HyDem IAH Aft Duct OD Prior to Installation of ICCP Components and ICW at Installation Activity

B-87

NOTES for: Figure B-72. SSN 774 Class - SSN 790 HyDem IAH Aft Duct OD Prior to Installation of ICCP Components and ICW at Installation Activity

1. The IAH Aft Duct will be installed at the time of blasting and painting on the duct OD.

2. Lifting hole plugs (QTY 24) shall be installed prior to blasting and painting on the duct OD.

3. Do not blast or paint threaded holes.

4. Follow the special paint requirements for Propulsor Inconel 625 substrate perReference 1-2.e, regarding the use of Silane additive in the SHT paint system.

5. ICCP conduits on the duct OD (not shown) to be painted same as surrounding structure.

6. The ICCP components are located in the middle bay of the HyDem IAH AOS.

7. After installation of fasteners for attachment of hydrophone clamps and attachment of cover plates, exposed surfaces shall be cleaned, roughened with 80-120 grit sandpaper, re-cleaned, and painted/touched up with the appropriate final paint system.

8. Overlap SHT paint system approximately 0.5” onto existing paint on forward flange.

B-88

Figure B-73 SSN 774 Class - SSN 790 HyDem IAH Aft Duct OD Except in Way of ICCP Components After Installation of ICW at Installation Activity

B-89

NOTES for: Figure B-73. SSN 774 Class - SSN 790 HyDem IAH Aft Duct OD Except in Way of ICCP Components After Installation of ICW at Installation Activity

1. The IAH Aft Duct will be installed at the time of ICW installation and painting on the duct OD.

2. Lifting hole plugs (QTY 24) shall be installed and groomed prior to painting of the Duct OD.

3. Do not prepare or paint threaded holes.

4. Lightly abrade and clean areas to be painted.

B-90

Figure B-74 SSN 774 Class - SSN 790 HyDem IAH Aft Duct OD in Way of ICCP Components After Installa-tion of ICW at Installation Activity

B-91

NOTES for: Figure B-74. SSN 774 Class - SSN 790 HyDem IAH Aft Duct OD Except in Way of ICCP Components After Installation of ICW at Installation Activity

1. The IAH Aft Duct will be installed at the time of ICW installation and painting on the duct OD.

2. Lifting hole plugs (QTY 24) shall be installed and groomed prior to ICW installation.

3. ICCP Anode shown, ICCP Reference Cell similar.

4. Lightly abrade and clean areas to be painted.

5. Do not abrade or paint ICCP components.

6. The ICCP components are located in the middle bay of the HyDem IAH AOS.

B-92

APPENDIX C

SSN 774 CLASS EXTENDED LIFE DUCT PAINT FIGURES (SSN 792 AF)

C-1. APPLICABLE DRAWINGS.

NAVSEA Dwg. 245-7108864, SSN 774 Class Submarine Propulsor Tailcone Assembly and Details

NAVSEA Dwg. 245-7108672, SSN 774 Class Submarine 1A Component Assembly and Details

NAVSEA Dwg. 245-7383601, SSN 774 Class Submarine Rotor Assembly NDP3.1H

NAVSEA Dwg. 245-7315828, SSN 774 Class NDP3.1HS/HM Rotor Mod

NAVSEA Dwg. 245-7642137, SSN 774 Class Submarine Rotor Assembly NDP3.1HC

NAVSEA Dwg. 245-8483199, SSN 774 Class Extended Life Propulsor AFT Duct

NAVSEA Dwg. 245-8483200, SSN 774 Class Extended Life Propulsor FWD Duct

NAVSEA Dwg. 245-8483201, SSN 774 Class Extended Life Propulsor Assembly

NAVSEA Dwg. 245-8543144, Extended Life Propulsor Incompressible Wedge Installation

NAVSEA Dwg. 245-7108671, SSN 774 Class Propulsor NDP3.0 Ropeguard and Fairing Covers Assembly and Detail

NAVSEA Dwg. 245-8328557, SSN 774 Class Propulsor AM Tailcone

NAVSEA Dwg. 633-8543214, Extended Life Propulsor ICCP & Hydrophone Assembly & Installation

C-1

Figure C-1 SSN 774 Class EL Duct - Hull Fairing Plate Painting at Vendor

C-2

Figure C-2 SSN 774 Class EL Duct - Hull Fairing Plate Painting at Installation Activity Prior to SHT Installa-tion

C-3

Figure C-3 SSN 774 Class EL Duct - Hull Fairing Plate Painting Final Condition

C-4

Figure C-4 SSN 774 Class EL Duct - Hull Fairing Plate Grooming

C-5

NOTES for: Figures C-1 to C-4. SSN 774 Class EL Duct - Hull Fairing Plate Painting and Grooming

1. Hull Fairing Plates

a. Hull Fairing Plate OD:

At the vendor, prepare and paint the countersinks and thru holes which shall be prepared and painted with Paint System 6,Table 6-6, with the exception of the FWD-most countersinks in the corners of each plate (2 per plate), which shall be left as bare metal. The plate OD shall be painted with one (1) coat of MIL- DTL-24441 F150 green primer, and overlap of Paint System 6,Table 6-6is allowed only around the plate periphery in order to paint the countersinks without masking. At the installation activity, the plate OD (including fastener heads) shall be prepared and painted in accordance with the SHT Paint System defined in Reference 1-2.eor 1-2.f, as applicable. Care should be taken to overlap the SHT Paint System over the edges of the plates so ensure that no bare metal is exposed following the blasting preparation. After instal-lation of SHT on the OD areas, prepare and paint the exposed SHT and hull fairing plate surfaces, includ-ing grooming, in accordance with the SHT Paint System defined inReference 1-2.eor 1-2.f, as applicable.

b. Hull Fairing Plate ID: The anodes and associated hardware (except welded studs) shall be removed from the plate ID prior to preparing and painting of the ID surfaces. All ID surfaces, including stud welds, shall be prepared and painted with Paint System 6,Table 6-6. The stud threads shall be protected from prepara-tion and painting operations. Do not paint the tile system, but inadvertent overspray is acceptable. See Figure C-64for painting requirements of anodes and associated hardware.

c. Hull Fairing Plate Edges:

Hull fairing plate edges shall be prepared and painted with Paint System 6,Table 6-6.

d. Hull Fairing Plate Faying Surfaces:

Faying surfaces shall be prepared and painted with Paint System 6,Table 6-6.

2. Hull Fairing Plate Attachment Fasteners

a. Attachment Fasteners:

(1) Prior to installation:

The heads of the fasteners shall be abrasive blasted and painted with the primer coat of the SHT Paint System, defined inReference 1-2.eor 1-2.f, as applicable, prior to installation. The socket openings on the fasteners shall be prepared and painted to the maximum extent practicable. The faying surfaces of the fastener heads shall not be blasted or painted. Fastener threads shall not be prepared or painted prior to installation.

(2) After installation of fasteners:

After fastener installation, DFT measurements on touch-up paint on the installed fasteners are not required. The primed fastener head shall be cleaned, roughened with 80-120 grit paper, and re-cleaned prior to applying 2nd coat of the SHT Paint System, defined inReference 1-2.eor 1-2.f, as applicable, and grooming. SeeFigure C-4for grooming requirements. Upon completion of required grooming, the groomed fastener heads, shall be painted with the remaining required coats similar to the adjacent sur-faces.

b. Fastener Paint to be Restored in Place (No Fastener Removal or Replacement):

For in-place repair of fastener grooming and/or paint, exposed fastener heads shall be prepared prior to restoration of grooming and /or paint. Upon completion of required painting and grooming in accordance with Figure C-4, the exposed surfaces shall be prepared and painted with the remaining required coats similar to adjacent surfaces.

c. Lifting and Handling Set Screws:

(1) Prior to installation:

The installation activity shall blast and paint the tops and bottoms of the set screws with the primer coat of the SHT Paint System, defined inReference 1-2.eor 1-2.f, prior to installation.

(2) After installation of set screws:

The primed fastener heads shall be cleaned, roughened with 80-120 grit paper, and re-cleaned prior to applying 2nd coat of the SHT Paint System, defined inReference 1-2.eor 1-2.f, as applicable, and grooming. SeeFigure C-4for grooming requirements. Upon completion of required grooming, the groomed fastener heads, shall be painted with the remaining required coats similar to the adjacent sur-faces.

C-6

Figure C-5 SSN 774 Class EL Duct - 1A Component Painting at Vendor

C-7

Figure C-6 SSN 774 Class EL Duct - 1A Component Painting at Installation Activity

C-8

Figure C-7 SSN 774 Class EL Duct - 1A Component Painting Final Condition

C-9

Figure C-8 SSN 774 Class EL Duct - 1A Component Painting Final Condition

C-10

NOTES for: Figures C-5 to C-8. SSN 774 Class EL Duct - 1A Component Painting

1. 1A Component Painting at 1A Component Vendor:

Prepare and paint 1A Component surfaces with Paint System 7,Table 6-7. Faying surfaces, instrumentation holes, shear pin holes, and fastener holes shall not be blasted or painted. After blasting, measure the blast pro-file in at least six random locations on both major faces of the component. After the coat of AC paint has cured, the FWD and AFT rabbets, FWD base hydro surface adjacent to the Hull Fairing Plate faying surface, the longitudinal gaps, and the AFT hydro surface adjacent to the Ropeguard shall be masked off prior to tack coat and AF application, as indicated. The 1A tip shall be painted with one coat of MIL-PRF-23236 Fast Clad Primer applied at 4-8 mils DFT. The application of AF paint to the longitudinal faces of the base is optional, and inadvertent overspray of AF onto this area outside of the required 0.6” masked area near the 1A base is acceptable. The base area between the FWD and AFT lands shall be painted in with two coats of Paint Sys-tem 6,Table 6-6. Apply a stripe coat to the 1A Trailing Edge (TE) following the application and cure of the 1st coat of paint using MIL-DTL-24441 Type IV F151haze gray. The stripe coat can be applied by brush and shall encompass all edges as well as at least one-inch border outside each edge. Once the stripe coat has fully cured perReference 1-2.g, continue the application process with the 2nd coat of paint. Note that the stripe coat can be eliminated if additional DFT readings are measured and recorded in accordance with Attachment A of Reference 1-2.c.

2. 1A Component Painting at FOS Assembly Vendor:

a. After 1A assembly onto the BSS, the longitudinal gaps shall be prepared and groomed in accordance with Figure C-8. Upon completion of required grooming, the groomed gaps shall be painted with the remaining required coats (coats 2-5 of Paint System 7,Table 6-7) similar to the adjacent surfaces.

b. The faying surfaces of the key retainer shall not be painted. The fastener bearing area on the key holder (min 0.75” surrounding the thru hole) shall be painted with 1 coat of MIL-DTL-24441 Type IV F150 green primer. The remainder of the exposed portions of the key retainer shall be painted with Paint System 6, Table 6-6.

3. 1A Component Painting at Installation Activity:

The FWD non-hydrodynamic face within the Hull Fairing Plate Cavity shall be prepared and painted with the Hull Fairing Plate Cavity with Paint System 5,Table 6-5. After installation of the Hull Fairing Plates, prepare and paint the FWD hydrodynamic surface adjacent to the Hull Fairing Plates with an AC tack coat and remaining coats of the SHT paint system in accordance withReference 1- 2.eor 1-2.f, as applicable.

4. 1A Component Paint Repairs:

a. Prior to blasting operations, the 1A/duct interface shall be masked off so that no paint will be removed at the interface, and no blast grit or other debris will enter the interface when blasting close to the 1A/duct inner diameter interface. Virgin Sponge Jet Media must be used if it is necessary to blast over these areas.

b. Prior to blasting operations, the FWD faying surface for the hull fairing plate attachment, the AFT faying surface for the ropeguard attachment, the 1A keyway, the key, and the key retainer on the AFT face of the 1A palm shall all be masked off so that no paint will be removed. These areas shall be masked prior to blasting and painting.

C-11

Figure C-9 SSN 774 Class EL Duct - Bearing Support Structure Vendor Painting

C-12

Figure C-10 SSN 774 Class EL Duct - Bearing Support Structure Spotface Painting at Vendor

C-13

Figure C-11 SSN 774 Class EL Duct - Bearing Support Structure Painting at Installation Activity

C-14

Figure C-12 SSN 774 Class EL Duct - Bearing Support Structure Spotface Painting at Installation Activity

C-15

Figure C-13 SSN 774 Class EL Duct - Bearing Support Structure Painting Final Condition

C-16

Figure C-14 SSN 774 Class EL Duct - Typical Masking Requirements for Hull Fairing Plate Cavities

C-17

NOTES for: Figures C-9 to C-14. SSN 774 Class EL Duct - Bearing Support Structure Painting

1. Bearing Support Structure:

Prepare and paint exposed surfaces with Paint System 7,Table 6-7except as otherwise noted. (Note: These are non-hydro surfaces, and the 2nd coat of AF is optional and may be deleted.).

a. Do not prepare or paint bearing lands or alignment ring faying surfaces.

b. At the Vendor, no paint is required on Inconel or NiCu surfaces in way of poured-in-place syntactic. Stripe coats are not required in way of poured-in-place syntactic. Surfaces in way of poured-in-place syntactic only require cleaning as surface preparation. Cleaning may be accomplished by the use of solvent and/or mechanical methods such as blasting, needle guns, sanding discs/pads, wire brushes, etc. Staining and tightly adhering mill scale and rust are acceptable for surfaces in way of poured-in-place syntactic. Paint applied in the heat affected zone following welding of Item 1-8 is applied to best effort with no inspection required. Brush coating is permitted in the heat affected zone.

c. Areas in way of spotfaces shall be prepared prior to installation of the nuts. Ensure that an even single coat of MIL-DTL-24441 Type IV F150 green primer is applied to all spotfaces, and that no paint system from adjacent surfaces overlaps onto spotface prior to fastener installation. After installation of the nuts, the exposed surfaces of the spotfaced areas shall be prepared and painted similar to adjacent surfaces.

d. Hull Fairing Plate Cavity:

(1) The hull fairing plate faying surface of the Forward Bolting Ring or Spacer Ring shall be painted in accordance with Paint System 6,Table 6-6at the vendor.

(2) At the installation activity, mask the cavity surfaces in accordance withFigure C-14prior to blasting.

All Hull Fairing Plate cavity surfaces shall be prepared and painted with Paint System 5,Table 6-5at the installation activity. The exposed surface of the forward bolting ring or the installed spacer ring located within the hull fairing plate cavity will be prepared and painted with Paint System 5,Table 6-5 with the other Hull Fairing Plate Cavity surfaces.

e. Pc1A Cavity:

The Pc1A Cavity shall be prepared and painted in accordance with Paint System 5,Table 6-5prior to Pc1A attachment to the BSS at the vendor. Note that 1/8” shall be left unpainted within the cavity on both the FWD and the AFT Pc1A lands in order to allow proper fit-up of the Pc1As.

f. Vent holes at TDC and BDC shall be painted at Vendor with Paint System 7,Table 6-7.

g. A stripe coat shall be applied to all edges, corners, and gussets of the BSS and the snubber segments fol-lowing the full cure of the 1st coat of paint. The stripe coat shall be MIL-DTL-24441 TyIV F151 haze gray.

The stripe coat shall be applied by brush and shall encompass all edges as well as at least one-inch bor-der outside the edge. Following the cure of the stripe coat perReference 1-2.g, continue paint application with the 2nd coat of paint. Note that the stripe coat can be eliminated if additional DFT readings are mea-sured and recorded in accordance with Attachment A ofReference 1-2.c.

h. Note that when refurbishing paint during maintenance periods, Paint System 5,Table 6-5may be used as an alternative to Paint System 7,Table 6-7for the FWD portion of the BSS in way of the mud tank free flood area. The application of a tie coat and anti-fouling paint shall be consistent with the surrounding space. Paint System 6,Table 6-6shall be maintained within the vent holes and shall overlap a minimum of 0.5 inches with Paint System 5 outside of the vent holes.

2. Anodes and Hardware:

a. Anode Studs:

The anodes and associated hardware (except welded studs) shall be removed from the cavity prior to pre-paring and painting of the cavity surfaces. All cavity surfaces, including stud welds and stud shanks, shall be prepared and painted with Paint System 7,Table 6-7. The stud threads shall be protected from prepara-tion and painting operations. After final cure of Paint System 7,Table 6-7and upon completion of anode installation, exposed stud threads shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with MIL-DTL-24441 Type IV F150 green primer with adjacent exposed nut surfaces (seeNote 2.d.2).

b. Anodes:

Low voltage anodes shall NOT be prepared or painted.

c. Anode Lock washers:

Lock washers shall NOT be prepared or painted.

d. Anode Nuts:

C-18

(1) Prior to installation, the anode nut surfaces which will be exposed after installation shall be abrasive blasted and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer offhull. The faying surfaces, self-locking ring elements and threads of the nut shall not be blasted or painted.

(2) After installation, the exposed anode nut surfaces shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with MIL-DTL-24441 Type IV F150 green primer with adjacent exposed stud threads (seeNote 3.a).

3. Snubber Assembly:

Exposed surfaces of the Snubber Assembly are considered non-hydrodynamic surfaces and shall be prepared and painted with Paint System 7,Table 6-7(for painting of non-hydro surfaces, the 2nd coat of AF is optional and may be deleted). Faying Surfaces and thru holes for the snubber assembly shall be prepared and painted in accordance with Paint System 6,Table 6-6. Tapped holes shall not be prepared or painted.

4. Fasteners & Nuts:

a. For 1A base attachment fasteners at the vendor, the fastener heads shall be painted with a single coat of green primer prior to installation, and then painted after installation perNote 4.b.2below.

b. Fasteners:

(1) Prior to installation, the heads of the replacement fastener shall be abrasive blasted and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer prior to installation. The socket openings on the fasteners shall be prepared and painted to the maximum extent practicable. The faying surfaces of the fastener heads shall not be blasted or painted. Fastener threads shall not be prepared or painted prior to installation.

(2) After installation, the primed fastener head shall be cleaned, roughened with 80-120 grit paper, and re-cleaned prior to applying the remaining required coats similar to the adjacent surfaces. The exposed fastener threads shall be painted with the remaining required coats similar to adjacent surfaces.

c. Fastener Paint to be Restored in Place (No Fastener Removal or Replacement):

For in-place repair of fastener paint, exposed fastener heads and threads shall be prepared prior to restora-tion of paint and painted with the remaining required coats similar to adjacent surfaces.

d. For BSS-to-ship attachment nuts at the vendor, the nuts shall be painted with a single coat of green primer.

The BSS-to-ship attachment fastener and stud shall not be painted at the vendor.

e. Nuts:

Prior to installation, the nut surfaces which will be exposed after installation shall be abrasive blasted and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer off-hull. The faying surfaces, threads, and self-locking ring elements of the nuts shall not be blasted or painted. After installation, the exposed surfaces of the nuts shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with the remaining required coats similar to adjacent surfaces.

f. Nut Paint to be Restored in Place (No Nut Removal or Replacement):

For in-place repair of nut paint, exposed nut surfaces shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted with the remaining required coats similar to adjacent surfaces.

5. Hydrophone Mounting Components:

At the Vendor, Cable Clips and Hydrophone Mounts, including faying surfaces, shall be prepared and painted in accordance with Paint System 6,Table 6-6. On surfaces that will be exposed after installation, prepare and paint with coats 2-5 of Paint System 7,Table 6-7. Do not blast or paint the thru holes in the Hydrophone Clamp or the ID of the Hydrophone Cable Conduit. Do not blast or paint Hydrophone assemblies.

C-19

Figure C-15 SSN 774 Class EL Duct - Ropeguard with Bolt-On Trailing Edge Painting at Vendor

C-20

Figure C-16 SSN 774 Class EL Duct - Ropeguard with Bolt-On Trailing Edge Painting at Installation Activity

C-21

Figure C-17 SSN 774 Class EL Duct - Ropeguard with Bolt-On Trailing Edge Painting Final Condition

C-22

Figure C-18 SSN 774 Class EL Duct - Ropeguard & ICCP Anode Painting at Vendor

C-23

Figure C-19 SSN 774 Class EL Duct - Ropeguard & ICCP Anode Painting at Installation Activity

C-24

Figure C-20 SSN 774 Class EL Duct - Ropeguard & ICCP Anode Painting Final Condition

C-25

Figure C-21 SSN 774 Class EL Duct - AM Diver Access Panel Painting at Vendor

C-26

Figure C-22 SSN 774 Class EL Duct - AM Diver Access Panel Painting at Installation Activity

C-27

Figure C-23 SSN 774 Class EL Duct - AM Diver Access Panel Painting Final Condition

C-28

Figure C-24 SSN 774 Class EL Duct - Ropeguard & ICCP Anode Grooming

C-29

Figure C-25 SSN 774 Class EL Duct - Top Ropeguard Segment Lifting Hole Set Screws Grooming

C-30

Figure C-26 SSN 774 Class EL Duct - Ropeguard Diver Access Panel Grooming

C-31

Figure C-27 SSN 774 Class EL Duct - AM Diver Access Panel Grooming

C-32

NOTES for: Figures C-15 to C-27. SSN 774 Class EL Duct - Ropeguard Painting and Grooming

1. Ropeguard with Bolt-on Trailing Edge:

a. Ropeguard OD:

Prepare and paint the OD surfaces, excluding areas in way of ICCP anode, with Paint System 6,Table 6-6 at the vendor, and Paint System 7,Table 6-7, at the installation activity. The surfaces of the ICCP anode recess shall be prepared and painted with one coat of MIL-DTL-24441 F150 green primer prior to anode installation. Countersinks and thru holes shall be prepared and painted in accordance with Paint System 6, Table 6-6. At the installation activity, paint shall be removed from the ropeguard fastener countersinks identified inFigure C-24prior to fastener installation and grooming. Do not blast or paint ICCP anode or threaded inserts.

b. Ropeguard ID:

ID surfaces in way of where SHT will be installed shall be prepared and painted in accordance with Elec-tric Boat Report U-341-98-004; “New Attack Submarine (NSSN) Forward Ropeguard Special Treatment Material (STM) Installation Procedure - (Ropeguard STM Procedure)”. Following installation of SHT, pre-pare and paint exposed SHT in accordance with Paint System 4,Table 6-4. All other ID surfaces shall be prepared and painted with Paint System 7,Table 6-7, with the exception of faying surfaces which shall be painted with Paint System 6,Table 6-6. Note that if ropeguard ID has damping tiles installed in lieu of SHT, the ID shall be painted with Paint System 6,Table 6-6prior to damping tile installation. Damping tiles and attachment hardware should not be painted, but inadvertent overspray is acceptable.

c. Ropeguard Edges:

Longitudinal and AFT edges of the ropeguard shall be painted in accordance with Paint System 7,Table 6-7. FWD edge shall be painted in accordance with Paint System 6,Table 6-6.

d. Ropeguard Faying Surface:

Faying surface shall be prepared and painted in accordance with Paint System 6,Table 6-6.

e. Bolt-On Trailing Edge:

Faying surface of Bolt-on Trailing Edge shall be prepared and painted with Paint System 6,Table 6-6. After trimming and installation, Bolt-on Trailing Edge shall be prepared and painted with Paint System 7,Table 6-7.

2. Lap Plates:

Faying surfaces and thru holes shall be prepared and painted with Paint System 6,Table 6-6. All other sur-faces and edges shall be prepared and painted with Paint System 7,Table 6-7.

3. ICCP Anode, ICCP Anode Enclosure (Can), ICCP Conduits and ICCP Conduit Pipe Flange:

a. ICCP Anode and Associated Attachment Fasteners:

Do not prepare or paint ICCP anodes. Prepare, paint, and groom ICCP component attachment fasteners in accordance with NAVSEA 633-8543214.

b. ICCP Anode Enclosure:

Prepare and paint the outside surfaces of the ICCP Anode Enclosure with Paint System 7,Table 6-7. Fay-ing surfaces and thru holes on the ICCP Anode Enclosure shall be prepared and painted in accordance with Paint System 6,Table 6-6.

c. ICCP Conduit Components including ICCP Conduit Pipe Hangers, Pipe Flanges, Shims, and Caps:

At the Vendor, prepare and paint all surfaces with one coat of MIL-DTL-24441 F150 green primer. After installation, prepare and paint exposed surfaces with coats 2-5 of Paint System 7,Table 6-7. No paint is required in way of syntactic. Do not prepare or paint thru holes, interior conduit surfaces, or interior pipe flange surfaces. Inadvertent paint is acceptable on the thru holes.

d. ICCP Conduits:

At the Vendor, prepare and paint the outside surface of the ICCP Conduits with Paint System 7,Table 6-7 Faying surfaces of pipe flanges shall be prepared and painted with Paint System 6,Table 6-6.

e. A stripe coat shall be applied to all edges and corners of the ICCP cans following the full cure of the 1st coat of paint. The stripe coat shall be MIL-DTL-24441 TyIV F151 haze gray. The stripe coat shall be applied by brush and shall encompass all edges as well as at least one-inch border outside the edge. Fol-lowing the cure of the stripe coat perReference 1-2.g, continue paint application with the 2nd coat of paint.

Note that the stripe coat can be eliminated if additional DFT readings are measured and recorded in accor-dance with Attachment A ofReference 1-2.c.

4. Fasteners & Nuts, Including ICCP Conduit Attachment Fasteners and Nuts:

C-33

a. Fasteners to be Replaced:

(1) Prior to installation:

For fasteners that are to be replaced, the fastener heads shall be abrasive blasted and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer prior to installation. The socket openings on the fasteners shall be prepared and painted to the maximum extent practicable. Faying surfaces of fasten-ers shall not be blasted or painted. Fastener threads and ends shall not be prepared or painted prior to installation.

(2) After installation of the replacement fastener:

After fastener installation, touch up primer as required. The primed fastener head shall be cleaned, roughened with 80-120 grit paper, and re-cleaned prior to grooming. As required, fastener heads and seams shall be groomed in accordance withFigures C-24, C-25, C-26, andC-27. Upon completion of required grooming, the groomed and ungroomed fastener head surfaces shall be painted with remain-ing required coats similar to the adjacent surfaces. Exposed fastener threads and ends do not require paint; however, inadvertent paint is acceptable.

b. Fastener Paint to be Restored in Place (No Fastener Removal or Replacement):

For in-place repair of fastener grooming and/or paint, exposed fastener heads shall be prepared prior to restoration of grooming and/or paint. Upon completion of required AC painting, fastener heads and seams shall be groomed in accordance withFigures C-24, C-25, C-26, andC-27as required. Upon completion of required grooming, the groomed and ungroomed fastener head surfaces shall be painted with remaining required coats similar to the adjacent surfaces. Exposed fastener threads and ends do not require paint;

however, inadvertent paint is acceptable.

c. Nuts:

(1) Prior to installation:

The nut surfaces which will be exposed after installation shall be abrasive blasted and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer off-hull. The faying surfaces, threads, and self-locking ring elements of the nuts shall not be blasted or painted.

(2) After installation:

The exposed surfaces of the nuts within the Forward Ropeguard Cavity that are accessible when the Diver Access Panel is removed shall be cleaned, roughened with 80-120 grit paper, re-cleaned and painted similar to adjacent surfaces.

d. Nut Paint to be Restored in Place (No Nut Removal or Replacement):

For in-place repair of nut paint, exposed nut surfaces within the Forward Ropeguard Cavity that are acces-sible when the Diver Access Panel is removed shall be prepared and painted similar to adjacent surfaces.

e. Lifting and Handling Set Screws:

The heads of the lifting and handling set screws shall be blasted and painted with one coat of MIL-DTL- 24441 Ty IV F150 green primer at the vendor.

5. AM Diver Access Panel:

a. GRP Panel:

Do not blast or paint the GRP panel FWD edges, faying surfaces, TE rabbet adjacent to the Trimmable TE Segment, or in way of syntactic foam. The GRP panel ID and OD shall be prepared and painted with Paint System 3,Table 6-3. Only surfaces that will be exposed following installation shall be painted.

b. Lap Plates, Transition Plate, and Welded-Nut Plate for Trimmable TE Segment:

Faying surfaces, thru holes, and countersinks shall be painted in accordance with Paint System 6,Table 6-6.

Surfaces exposed following installation shall be painted in accordance with Paint System 7,Table 6-7.

c. Set Screws for Hinge Attachment:

The heads of the set screws shall be blasted and painted with one coat of MIL-DTL-24441 Ty IV F150 green primer at the vendor.

C-34

Figure C-28 SSN 774 Class EL Duct - NDP 3.1H/HM Rotor Painting at Vendor

Figure C-29 SSN 774 Class EL Duct - NDP 3.1H/HM Rotor Painting at Installation Activity

C-35

Figure C-30 SSN 774 Class EL Duct - NDP 3.1H/HM Rotor Painting Final Condition

Figure C-31 SSN 774 Class EL Duct - NDP 3.1HC Rotor Painting at Vendor

C-36

Figure C-32 SSN 774 Class EL Duct - NDP 3.1HC Rotor Painting at Installation Activity

Figure C-33 SSN 774 Class EL Duct - NDP 3.1HC Rotor Painting Final Condition

C-37

NOTES for: Figures C-28 to C-33 - SSN 774 Class EL Duct - Rotor Painting NOTE: For some rotor design types, the hydrodynamic surfaces were not painted at original manufacture.

1. Do not blast or paint shaft faying surface, 1 inch AFT of the shaft faying surface on the shaft flange ID, shaft attachment bushings, threaded holes, dowel pin holes or stamped data.

2. Rotor Hub ID:

a. Rotor Hub ID surfaces in way of Mass Plates shall be blasted and receive one coat of MIL-DTL- 24441

Ty IV F150 green primer. Rotor Hub ID surfaces in way of Balance Weights shall not be blasted or painted.

Following installation of Mass Plates and Balance Weights, the Rotor ID shall be prepared and painted in accordance with Paint System 7,Table 6-7, except for areas excluded byNote 1.

b. Faying surfaces of Mass Plates shall be blasted and receive one coat of MIL-DTL-24441 Ty IV F150 green primer. Inadvertent paint in Mass Plate bolt holes is acceptable. Faying surfaces of Balance Weights shall not be blasted or painted. Once installed, the exposed surfaces of both Mass Plates and Balance Weights shall be prepared and painted in accordance with Paint System 7,Table 6-7.

3. Rotor Hub OD and Hydrodynamic Surfaces: For NDP 3.1H/HM and NDP 3.1 HC Rotors: The hub OD and hydrodynamic surfaces shall be prepared and painted in accordance with Paint System 7,Table 6-7.

a. Stamped data on the hub OD shall be left unpainted. The stamped data shall be masked prior to blasting and painting and remain masked at all times throughout the preparation and painting operations. After cur-ing of the final coat of paint, the paint around the perimeter of the hub stamped data shall be hand sanded with 80-120 grit paper to make a smooth and gradual transition (10:1 taper). Ensure that there are no hard edges between the painted and unpainted surfaces in way of the hub stamped data.

b. A stripe coat shall be applied to the rotor blade Trailing Edge (TE) following the application and cure of the 1st coat of paint. The stripe coat shall be MIL-DTL-24441 TyIV F151 haze gray. The stripe coat shall be applied by brush and shall encompass all edges as well as at least oneinch border outside the edge. Fol-lowing the cure of the stripe coat, continue paint application with the 2nd coat of paint. Note that the stripe coat can be eliminated if additional DFT readings are measured and recorded in accordance with Attach-ment A of Reference 1-2.c.

c. When authorized by NSWCPD 426, Phillybond TA-30 may be used to fill gaps in mechanical joints (i.e.

post screws and DVAs) and large porosity on the blade surfaces. Phillybond TA-30 shall only be applied following the first coat of paint.

4. Rotor Hub FWD Face:

a. At vendor:

Following installation of Mass Plates (on H/HM rotors only) and Balance Weights, the forward face of the rotor hub shall be blasted and painted with the first coat of Paint System 7,Table 6-7. Blasting and paint-ing shall begin 0.5 inches inside the exposed surface of the hub at the forward end.

b. At installation activities:

Prepare and paint the forward end of the hub when received with single primer paint coat. Preparation and paint shall be performed during installation sequence such that there is adequate access to the forward face of the hub and shall begin 0.5 inches inside the exposed surface of the forward end. The primed portion of the forward end of the hub shall be cleaned, roughened with 80 grit paper, and re-cleaned prior to paint-ing with coats 2-5 of Paint System 7,Table 6-7. Ensure that newly applied AF paint coats overlap exist-ing AF paint. DO NOT OVERLAP AC PAINT ONTO AF PAINT.

5. Rotor Hub AFT Face:

Do not blast or paint the AFT face of the rotor, including a 0.50 inch overlap onto the Hub ID. Do not blast or paint tailcone attachment holes.

6. Attachment Fasteners, Washers and Plugs:

a. Items to be prepped and painted by the Vendor only:

SB studs (HC only), SB nuts (HC only), FWD SB lifting hole plugs (HC only), and FWD SB fill plugs (HC only) shall NOT be blasted or painted prior to installation.