0519_A_LTFW_COOLER_CLEANING_AND_GASKET_CHANGE.doc

USNS Drew

( TAKE 10 )

1.0 ABSTRACT:

1.1 This item describes the cleaning of three LTFW coolers and replacing the gaskets.

2.0 REFERENCES:

2.1 NAVSEA DWG No. 256-8498905 Rev -; Central Seawater Cooling System Diagram.

2.2 NAVSEA Dwg No. 532-8498931 Rev -; Low Temperature Freshwater Cooling System Diagram.

2.3 Tech Manual T9532-AZ-MMC-010, Heat Exchangers, Plate/Frame Type Central Low Temp Fresh Water.

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location/Quantity:

3.1.1 Location:

-Main Machinery Space (5-66-0), 4th Deck, Frames 66 to 68

3.1.2 Quantity:

-Three (3) LT Fresh Water Heat Exchangers

3.2 Item Description/Manufacturer’s Data:

3.2.1 LTFW #1, #2, & #3 Plate Heat Exchangers

LT Plate Heat Exchanger

GEA Ecoflex GMbH

Type VT 2508 B-6

Max Working Press 101.5 PSI at 149F

MDMT 28.4F at 101.5 PSI

Test Press 9.1 Bar

Year Built 2003

Serial #s 179/50008

179/50009

179/50007

3.2.4 Bill of Materials: (Contractor Supplied):None

3.2.5 Quantities are considered estimates. The Contractor shall provide the exact quantities and additional material such as miscellaneous pipe fittings, elbows, caps valves, pipe hangers, weld material, cable hangers, cable tags, bus work, etc., which are not included in the List of Materials in order to install a fully functional system which meets the requirements of this specification.

3.2.2 All components and piping shall be rated for use in the Central Seawater Cooling System as follows:

-Operating Temperature

95F

-Design Temperature

95F

-Operating Pressure

30.2 PSI

-Design Pressure

45.3 PSI

-ABS Class III Piping System

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES: None.

5.0

NOTES:

5.1 The contractor and all subcontractors regardless of tier shall 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 including but not limited to GTRs 1 through 7 and 23.

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 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 without proper authorization.

5.4 THE USNS TAKE 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. THE CONTRACTOR SHALL ASSUME ALL ELECTRICAL CABLES ARE HOT UNTIL TESTED OTHERWISE. THE CONTRACTOR SHALL TEST ALL ELECTRICAL CABLES TO ENSURE THEY ARE DEAD PRIOR TO WORKING ON THE ITEM.

5.5 Rigging Pad eyes were installed during previous service.

5.6 Contractor shall assist “Tech Reps” with all facets of repairs and interference and removals.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 The contractor must follow the minimum and maximum plate pack measurement stamped on the side of the fixed end frame.

6.2 All work to be accomplished to the satisfaction of the Chief Engineer and Port Engineer.

7.0 STATEMENT OF WORK REQUIRED:

7.1 Ship’s Crew shall assistance isolation, tag out and secure the Salt Water Cooling and LT Fresh Water Cooling systems.

7.2 Drain both the LTFW and SW side of each heat exchanger. Dispose of LTFW in accordance with all Federal, State, and local requirements. LTFW is considered HAZMAT and shall be disposed of in accordance with work item “023 HAZARDOUS WASTE MANAGEMENT AND DISPOSAL”.

7.3 Disassemble and remove the end plates from each LTFW heat exchangers using References 2.1, 2.2 and 2.3 for guidance.

7.4 Replace all strainer baskets with GFM.

7.5 Provide Manufacturer’s Tech Rep to accomplish the removal, cleaning, regasketing, and reinstallation of each plate of all coolers.

7.5.1 Replace all gaskets with new EPDM gaskets.

7.5.2 Provide report of conditions found and recommendations to Port Engineer.

7.6 Reassemble heat exchangers using Reference 2.3 as guidance.

7.7 Preparation of Drawings/Documents: None.

7.8 Inspection/Testing:

7.8.1 Perform operational system pressure tests of each cooler. Inspect for leakage. No leakage is allowed. MSCREP to witness testing.

7.9 Painting:

7.13.1 Scale prime and paint and insulate all new and disturbed areas to match the surrounding areas.

7.10 Marking: None

7.11 Manufacturer's Representative:

7.11.1 Provide a “PHEX” Technical Representative to be present during the removal, cleaning, installation, and LTFW Cooler commissioning.

RECOMMENDED SOURCE:

PHEX LLC

Tanya Jackson

Tanya@phex-online.com

(937) 830-4203

195 Leonard Drive

Groton, CT 06340

(860) 434-9039

8.0 GENERAL REQUIREMENTS: None additional.

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