0102_A_Degaussing Cable and Conduit Removal_RevA.doc

USNS Lenthall

( TAO 189 )

1.0 ABSTRACT:

1.1 This item describes the removal of the Degaussing Cable and conduit in the Ballast, and Cargo Tanks From Frame 0-35

2.0 REFERENCES/ENCLOSURES:

2.1 References:

2.1.1 NAVSEA drawing 320-5904573, “Electrical System One-Line Power Diagram”

2.1.2 DOD STD 2003-1 (NAVY), Sectional, Electric Plant Standard Installation Manual, Dated 24 June 1987.

2.1.3 NAVSEA drawing 475-5905145 Rev. D, “Degaussing System Elementary Wiring Diagrams”

2.1.4 NAVSEA drawing 475-5905146 Rev B, “Degaussing System Isometric Wiring Diagrams”

2.1.5 NAVSEA drawing 475-5905147 Rev A., “Degaussing System Feeder and Coil Calculations Diagram”

2.1.6 NAVSEA drawing 475-5905148 Rev F., “Degaussing System Location of Coil Diagrams”

2.1.7 NAVSEA drawing 801-5904166 Rev. B, “General Arrangement Main Deck”

2.1.8 NAVSEA drawing 101-5903953, Rev. C, “Scantling Sections”

2.2 Enclosures:

2.2.1 None

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Locations:

3.1.1 SW Ballast Tank No.4 P 5-35-2

3.1.2 SW Ballast Tank No.4 S 5-35-1

3.1.3 DFM Cargo Tank No.3 P 5-31-2

3.1.4 DFM Cargo Tank No.3 S 5-31-1

3.1.5 SW Ballast Tank No.2 P 5-28-2

3.1.6 SW Ballast Tank No.2 S 5-28-1

3.1.7 JP-5 Cargo Tank No.2 C 5-26-0

3.1.8 DFM Cargo Tank No.1 P 5-22-2

3.1.9 DFM Cargo Tank No.1 S 5-22-1

3.1.10 SW Ballast Tank No.1 5-18-0

3.1.11 FP SW Ballast Tank 5-0-0

3.1.12 Degaussing Void (1-30-1) (#2 STBD SWBT)

3.1.13 Degaussing Void (1-30-2) (#2 PORT SWBT)

3.1.14 Degaussing Void (1-26-0) (#1 STBD DFM)

3.1.15 Degaussing Void (1-4-1) (Forepeak Tank)

3.1.16 Degaussing Void (1-4-2) (Forepeak Tank)

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES:

4.1 Government Furnished Equipment: None

4.2 Government Furnished Material:

4.2.1 Amercoat 240 Red Oxide

4.2.2 Amercoat 240 Off-white

4.2.3 Amercoat 240 Dark Gray

4.2.4 Amercoat 138G Dark Gray

4.2.5 Amercoat T-10 Solvent

4.3 Government Furnished Services: None

5.0 NOTES:

5.1 The contractor and all subcontractors, regardless of tier must consult the General Technical Requirements (GTR) to determine applicability to this work item. In performance of this work item, the contractor and all subcontractors regardless of tier must comply with the requirements of all applicable GTRs.

5.2 The contractor and all subcontractors, regardless of tier are advised to review other work items under this contract to determine their effect on the work required under this work item. Many of the definitions relating to performance of this work item are found in Work Item 001.

5.3 All sizes, lengths, dimensions and quantities provided are approximate. It is incumbent upon the contractor to verify the actual(s) during bidder’s survey (Ship Check).

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 None additional.

7.0 STATEMENT OF WORK REQUIRED:

7.1 Arrangements / Outfitting

7.1.1 Contractor to provide all staging as required to complete the work item.

7.2 Mechanical / Fluids:

7.2.1 Locations on ship identified in para. 3.1 of this work item. The tanks identified have degaussing cabling inside steel Conduit passing through their bulkheads internal to the tanks. All cables, to include Conduit to be removed including hangars and bulkheads inserted.

7.2.2 Removals:

7.2.2.1 Remove all M coil conduits and hangers/supports from the locations listed in para 3.1 and using reference 2.1.6 as guidance.

7.2.2.1.1 Contractor to cold cut conduits to gain gas-free.

7.2.2.2 For watertight and oil-tight boundaries, crop out 48” x 48” plate, with 4” radius corners, at the tank boundaries where cable runs penetrated.

7.2.2.3 Crop out deck mounted junction boxes and box supports flush with the deck at the three degaussing voids. Crop out 24” x 36” of the main deck to remove junction box access.

7.2.3 Installations

7.2.3.1 Prepare the disturbed areas inside the tank in accordance with the protection schedule for the prospective tank.

7.2.3.2 For all inserts, install a single ABS Grade AH32 insert plate with 3” radius corners. Plate thickness should be the same as originally designed. Butt the outboard edge of the insert against the shell. Welding shall be in accordance with ABS Rules and to the satisfaction of the attending survey.

7.3 Electrical

7.3.1 None

7.4 Preparation of Drawings / Documentation

7.4.1 None

7.5 Inspections / Test

7.5.1 All inserts shall have Fit-up inspections Performed in the presence of the ABS Surveyor, USCG, Chief Engineer and Pot Engineer.

7.5.2 All welds shall have Visual Inspections Performed.

7.5.3 All Welds shall have non-destructive testing performed.

7.5.4 All welds shall have water tightness testing done by Air Lance and Vacuum Box

7.6 Painting

7.6.1 All newly replaced steel shallbe blasted and inspected by the PPG Representative to make sure all mill scale has been removed

7.6.2 The contractor shall recoat with Preconstruction primer to reduce oxidation prior to install.

7.6.3 All burnt or disturbed paint to be prepared, feathering all edges and removing any weld spatter or sharp edges

7.6.4 Paint and prime all new and modified surfaces to match surrounding surfaces in accordance with GTR 7 and PPG product data sheets.

7.6.5 Ballast Tank Coating:

7.6.5.1 Apply the following MSC supplied PPG Paints to new and modified areas of ballast tanks affected by this item:

7.6.5.1.1 One (1) coat of Amercoat 403 Buff, 5-6 mils DFT

7.6.5.1.2 One (1) coat of Amercoat 403 off White, 5-6 mils DFT

7.6.5.1.3 Between coats, apply a stripe coat of Amercoat 403 Light Gray, 3-4 mils DFT to all welds, edges, and corners.

7.6.5.2 Cargo Oil Tank Coating: Apply the following MSC supplied PPG Paints to new and modified areas of cargo oil tanks affected by this item:

7.6.5.2.1 One (1) coat PPG Light Gray, 5-6 mils DFT

7.6.5.2.2 One (1) coat PPG 604 Off White, 5-6 mils DFT

7.6.5.2.3 Between coats, apply a stripe coat of PPG 604 Red Oxide, 3-4 mils DFT, to all welds, edges and corners.

7.7 Marking

7.7.1 None

7.8 Manufacturer’s Representative

7.8.1 MSC Paint Tech Representative provided by MSC

8.0 GENERAL REQUIREMENTS:

8.1 None additional.

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