0501_A_CMWD_Pipe_Replacement_(Zone_1)_Revised.doc

USNS AMELIA EARHART

(T-AKE 6)

MACHINERY, AUXILIARY SYSTEMS

N33205-16-R-4301

6 JANUARY 2016

ITEM NO. 501

Category “A”

MSC PM6/SA

CMWD PIPE REPLACEMENT (ZONE 1 ONLY) Revised

1.0 ABSTRACT:

1.1 This work item describes the requirements for the Contractor to replace the Counter Measure Wash Down “Cross-Tie” Piping leading to deck nozzles in Zone 1 as well as install low point drains in RAZ Bays 1 thru 4.

2.0 REFERENCES/ENCLOSURE:

2.1 References:

2.1.1 NAVSEA Drawing 523-7488761 Revision C, Counter Measure Wash-down System.

2.2 Enclosure:

2.2.1 Cross-Tie to Deck Nozzle (Ref 2.1.1, Detail 79-A).

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location/Quantity:

3.1.1 Locations:

CWMD Pipe (Zone 1) -WF-V-001 in FWD Stair tower 2-38.5-0 to Cross Tie Piping and Deck Nozzles.

3.1.2 Quantity: Approximately 20ea Cross-Ties to Deck Nozzles require fabrication.

Note:

Approximately 30ea have been fabricated, installed and tested in a recent availability.

3.2 Item Description/Manufacturer’s Data.

3.2.1 Bill of Materials: (Contractor Furnished Material):

3.2.1.1 All CMWD Cross-Tie piping, flanges, fittings, shall be CUNI and provided by the Contractor. Contractor shall replace all hangers, U-bolts, fasteners as well as provide NEW gaskets.

3.2.2 All material/components necessary to accomplish the work required by this specification, i.e. securements, Thread-o-lets / Sock-o-lets, and welding materials, shall be provided by the contractor.

3.3 System Data; Existing Counter Measure Wash-down Piping is Carbon Steel, ASTM A-53/A-106, GR B, XS WT, and Type S (SMLS).

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) 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.

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.

5.3 This ship contains High Voltage (HV) electrical systems. The contractor and subcontractors shall obey all posted and verbal instructions regarding safety and exclusion from High Voltage areas. At no time shall a contractor or subcontractor approach, work on, or enter a High Voltage area with out proper authorization.

5.4 THE USNS T-AKE CLASS ELECTRICAL COLOR CODING DOES NOT FOLLOW CONSISTENT COLOR SCHEME. THE SHIP IS KNOWN TO HAVE CURRENT CARRYING CONDUCTORS COLORED GREEN, BLUE, BLACK AND WHITE. ASSUME ALL ELECTRICAL CABLES ARE HOT UNTIL TESTED OTHERWISE. TEST ALL ELECTRICAL CABLES TO ENSURE THEY ARE DEAD PRIOR TO WORKING ON THE ITEM.

5.5 All final operational tests shall be witnessed by the ship’s force and the MSC Port Engineer prior to completing this work item.

5.6 All welding shall be in accordance with ABS rules for building and classing steel ships.

5.7 All spaces and piping shall meet gas free certificates prior to beginning any work.

5.8 Contractor is responsible for providing scaffolding for steel piping removal and reinstallation of NEW CMWD CUNI piping.

5.9 All piping shall be tig welded. No brazed joints allowed. No butt joints allowed. Use coupling where applicable.

5.10 Sections of STL pipe have been replaced. Identify STL pipes before cutting.

5.11 CMWD Pipe 02 Level, FR58 forward to breakwater has been replaced in a prior availability.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 All work and testing shall be IAW the latest ABS rules for Building and Classing Steel Vessels and to the satisfaction of and in the presence of the ABS Surveyor, Manufacturer’s Representative if necessary and MSC Port Engineer.

6.2 All welding requirements shall be accomplished by certified welders and credentials current and applicable to the work being performed. Fire watches shall be posted by the Contractor during all hot work.

6.3 Clean and gas free affected enclosed space as approved by the ship and or MSC Port Engineer.

7.0 STATEMENT OF WORK REQUIRED:

7.1 Arrangements/Outfitting: None.

7.2 Structural:

7.2.1 Scaffolding shall be constructed for access to the Counter Measure Wash Down Piping.

7.2.2 Design and fabricate all necessary arrangements, i.e. rigging, pad eyes, lifting gear and to safely remove and replace.

7.2.3 Provide crane services where required.

7.3 Mechanical/Fluid:

7.3.1 Removals:

7.3.1.1 Prior to start of work, ensure all affected piping and/or components are isolated from the system, depressurized, drained, and tagged out.

7.3.1.2 Immediately upon opening the system piping, cap or seal the openings in remaining piping to maintain system cleanliness and prevent contamination of surrounding area.

7.3.1.3 Segregate the Counter Measure Wash down System and drain the affected portion of piping. Dispose of drained water in accordance with all local, state, and federal laws.

7.3.2 Installations;

7.3.2.1 Install and re-target NEW CUNI piping to match existing.

7.3.2.2 Provide new gaskets for all flanged piping sections replaced.

7.3.2.3 Reinstall and reuse nozzles. Use of Teflon tape is encouraged.

7.3.2.4 Dispose of all piping being replaced. No item shall be left for ship’s force to dispose.

7.3.2.5 Replace deteriorated hangers where piping were removed and replaced with stainless STL hangers.

7.3.2.6 Replace all fasteners, u-bolts, and gaskets.

7.3.2.7 Prep hanger by mechanically cleaning, prime and paint all hangers.

7.3.2.8 All piping shall be re-installed with rubber grommets between the hanger and u-bolt fasteners.

7.3.2.9 Install low point drains in existing CUNI CMWD piping replaced prior in RAZ bays 1, 2, 3, and 4. For estimation purposes, installation shall include approx. 75ft CUNI SCH40 piping, 8ea new ball valves and end caps.

7.4 Electrical: None.

7.5 Preparation of Drawings:

7.5.1 Prepare and submit “red-lined” markup of Reference 2.1, Counter Measure Wash-down System Diagram, showing newly installed CUNI Piping.

7.6 Inspection/Test:

7.6.1 Inspection:

7.6.1.1 All welds accomplished shall be NDT tested with dye penetrate to assure no cracks exist prior to installation onboard.

7.6.2 Test:

7.6.2.1 Contractor shall perform preliminary test of CMWD piping prior to official test.

7.6.2.2 For info, system piping hydrostatic pressure is 190PSI.

7.7 Painting:

7.7.1 New CUNI piping shall be prepared (sanded, scuffed, and Thinner wiped, SSPC-SP2) to accept one prime coat (red oxide) and two top coats (Haze gray).

7.7.2 All Hangers supporting Counter Measure Washdown Piping (where STL is replaced with CUNI) shall be mechanically cleaned to SSPC-SP11 (Power Tool Cleaning to Bare Metal). Clean and prepare all surfaces of hangers for prime and paint with two top coats.

7.7.3 All new and disturbed surfaces to match surrounding areas in accordance with reference 2.2. Contractor shall use ShipS Force provided paint, primers, and thinners.

7.8 Markings:

None.

7.9 Manufacturer Representative: None.

8.0 General Requirements: None Additional.

Enclosure - Cross-Tie to Deck Nozzle (Detail 79-A of Ref 2.1.1,)

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