AMEND0003 0109_A_Potable Water Tank Vent Mod.docx

USNS SUPPLY

(T-AOE 6)

AMENDMENT 0003

POTABLE WATER TANK VENT MOD

1.0 ABSTRACT:

1.1 This work item describes the relocation of the potable water tank vents to within CPS zones and installation of deck drains to prevent deck flooding in the vent terminal area.

2.0 REFERENCES:

2.1 NAVSEA Drawing No. 505-6360553: Vents, Sounding Tubes, & Overflows Diagram

2.2 NAVSEA Drawing No. 528-6360570: Plumbing Soil and Waste Drain Diagram

2.3 MSC Drawing No. T-AOE 6 506-7489681, Potable Water Vent Piping Modifications Diagram

2.4 MSC Drawing No. T-AOE 6 506-8392065, Potable Water Tank Vent Piping Mod Diagram

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location: Various

3.2 Description: All items are installation activity furnished material. See the Material List in Reference 2.4.

3.3 Quantities: Quantities listed in Reference 2.4 are considered estimates. The contractor shall provide the exact quantities and additional material such as miscellaneous pipe fittings, pipe, elbows, caps, valves, pipe hangers, weld material, lagging, insulation, etc., which are not included in the List of Materials of Reference 2.4, in order to install a fully functional system, which meets the requirements of this specification.

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES: None

5.0 NOTES:

5.1 The contractor and all subcontractors, regardless of tier, must consult the General Technical Requirements (GTR’s) 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 GTR’s including but not limited to: GTR’s 1-7, 22, 23, 27, and 29.

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 the performance of this work item are found in Work Item 001.

5.3 Refer to Reference 2.4 for details on the existing list of equipment and standard symbols.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 All work shall be performed utilizing the best marine practice and shall satisfy the standards, regulations, requirements, and recommended practices of the American Bureau of Shipping (ABS), the Code of Federal Regulations (CFR) and MSC’s General Technical Requirements(GTR).

6.2 All damage caused by the removal of existing material shall be repaired with materials identical to the damaged material.

6.3 Substitution of equal quality material or components may be made with prior approval of the MSC representative.

6.4 Label plates shall be in accordance with MSC GTR No. 29, identifying markings.

6.5 All welding to be in accordance with ABS rules, US Coast Guard, CFR and MSC GTR. All welding to be to the satisfaction of the ABS surveyor.

6.6 Prior to all welding, burning, and other hot work, the hot work area shall be made “safe for workers / safe for hot work” and certified in accordance with OSHA safety and health regulations.

6.7 All rough or sharp edges and burrs are to be ground smooth to prevent injury to personnel or damage to equipment.

6.8 Piping shall be suitably secured by pipe hangers to provide adequate support, prevent vibration and protect against damage. Pipe hanger type, spacing, and method of attachment shall be in accordance with ASTM requirements.

7.0 STATEMENT Of WORK REQUIRED:

7.1 Arrangements/Outfitting: None

7.2 Structural:

7.2.1 Removals:

a. Using Reference 2.4 as guidance, remove deck covering (PRC) from inside drain coaming area.

7.2.2 Installations:

a. Install twenty four inch (24”) deck coaming using ASTM A36 ¼” steel between bulkheads in the starboard side passage outside the ENGR DEPT TECH LIBRARY (1-495-1-Q). Use ASTM A36 ¼” steel plate and caulking to create a watertight barrier along the ENGR DEPT TECH LIBRARY (1-495-1-Q) outboard joiner bulkhead. Coaming should isolate the tank vent terminal and deck drain from the rest of the passage. Use Reference 2.4 for guidance.

b. Remove old deck covering and install new PRC decking material in the vicinity of the modified tank vents

7.3 Mechanical:

7.3.1 Removals:

a. Remove Tank Vent Terminals on 01 Level and plug deck penetrations to ensure an air tight seal to preserve CPS zone integrity. Use Reference 2.4 for guidance.

b. Remove tank vent piping at main deck level. Plug deck penetration only on portside main deck level from tank vent pipe removal, starboard side deck penetration will be used later for deck drain installation. Use Reference 2.4 for guidance.

c. Partially remove tank vent piping on the second deck level. On portside, remove tank vent piping after bulkhead penetration from ENGINEERING STOREROOM (2-488-4-A) leaving approximately 12 inches of pipe protruding from bulkhead. On starboard side, remove piping after bulkhead penetration from ADP ROOM (2-500-3-Q). Use Reference 2.4 for guidance.

7.3.2 Installations:

a. Install new tank vents in locations specified by Reference 2.4. Starboard side, install tank vent terminal in MAIN DECK level passage outside ENGR DEPT TECH LIBRARY (1-495-1-Q). Ensure that the tank vent terminal is four inches (4”) above coaming level. Portside, install and route tank vent piping from bulkhead penetration down towards deck. Ensure that the tank vent terminal is four inches (4”) above the funnel top assembled in 7.3.2.c. Use Reference 2.4 for guidance.

b. Install new deck drain at the starboard side tank vent previous location, using the existing deck penetration. Route four inch (4”) waste drain piping from deck drain installed to connect with existing waste drain piping 4WD01-788 using a weldolet connection. Use Reference 2.4 for guidance.

c. Assemble ten inch (10”) to five inch (5”) drain funnel in PASSAGE 2-471-2-L. Route four inch (4”) waste drain piping down to the 1ST platform level, through bulkhead 510, and connect to 4WD01-780 in MMR2 (7-510-01-E) using y-branch connection. Use Reference 2.4 for guidance.

d. Install twenty four inch (24”) deck coaming using ASTM A36 ¼” steel between bulkheads in the starboard side passage outside the ENGR DEPT TECH LIBRARY (1-495-1-Q). Use ASTM A36 ¼” steel plate and caulking to create a watertight barrier along the ENGR DEPT TECH LIBRARY (1-495-1-Q) outboard joiner bulkhead. Coaming should isolate the tank vent terminal and deck drain from the rest of the passage. Use Reference 2.4 for guidance. AMEND 0003

7.4 Electrical: None

7.5 Electronics: None

7.6 Preparation of Drawings:

7.6.1 Provide as-built drawings of the completed installation with a detailed Bill of Materials using GTR 5 as guidance. Contractor to obtain MSC drawing numbers from the MSCREP. Drawings are to be reviewed and approved by local MSCREP prior to acceptance. Provide three hard copies (11”X17” or larger as required for clarity), one electronic PDF, and one electronic (DWG AutoCAD 2004) copy to the MSCREP.

7.7 Inspection/Test:

7.7.1 The contractor is responsible for notifying all applicable regulatory bodies of scheduled testing. Failure to obtain regulatory body representatives to witness testing, trial, or inspection shall require rescheduling the test, trial, or inspection at the Contractor’s expense.

7.7.2 Inspect all hot work prior to applying paint or insulation.

7.7.3 Hydrostatically test the new vent piping to the maximum head attainable by filling. Hold for 1 hour and inspect in presence of MSCREP.

7.7.4 Clean and Flush. After all new piping is installed, clean the system by flushing with the service fluid or a medium approved by the MSCREP.

7.8 Painting: Prep, prime, and paint all new piping and lagging, and all new and disturbed areas to match surrounding areas.

7.9 Marking:

7.9.1 Provide nameplates to identify each new vent.

7.10 Manufacturer Representative: None

8.0 GENERAL REQUIREMENTS: None Additional

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