0532_A_HTLT_Freshwater_System_Flush.doc

USNS Chambers

( TAKE 11 )

1.0

ABSTRACT

This item describes flushing High Temperature (HTFW), Low Temperature Freshwater(LTFW) Cooling Systems 2.0

REFERENCES

2.1 MSC Dwg. No. 256-8499057; Central Seawater Cooling System Diagram

2.2 MSC Dwg. No. 532-8499061; Diesel Generator High Temperature Freshwater Cooling System Diagram

2.3 MSC Dwg. No. 532-8499083; Low Temperature Freshwater Cooling System Diagram

2.4 Drew Marine Flushing Procedure – Maxigard to Liquidewt

3.0 ITEM LOCATION/DESCRIPTION

3.1 Location/Quantity

3.1.1 Main Machinery Room (MMR)

3.1.2 Auxiliary Machinery Room (AMR)

3.1.3 System Capacities:

HTFW ≈ 2500 Gallons

LTFW ≈ 14750 Gallons

3.2 Contractor Furnished Equipment:

3.2.1 Contractor shall furnish all hoses, tanks, pumps, heat exchanger, valves, piping, elbows, plugs, etc. necessary to perform a satisfactory flush. Provide a measurement device able to measure the pH level of cleaning fluid, rinse, and final fill fluid.

3.2.1 Rainmaker or Distillate water to flush system and allow Ships Force to fill/refill Distillate tanks.

3.2.2 Table 1 – Contractor Furnished Material

Circulating Pump(s) (If Required)

May be suitable to use Ships Pumps Electric or Air Driven (Wilden Pump or equivalent) capable of approx. 150-200gpm

3.2.3 Quantities are considered estimates. The contractor shall provide the exact quantities and (reasonable) additional material such as hose, hangers, sealant, screws, etc., in order to flush and install a fully functional system that meets the requirements of this specification.

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES:

4.1 The following materials will be Government furnished:

4.1.1 Liquidewt ≈ 50 Pails

4.2 Government Furnished Services (GFS): 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 the 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. OBEY ALL POSTED AND VERBAL INSTRUCTIONS REGARDING SAFETY AND EXCLUSION FROM HIGH VOLTAGE AREAS. AT NO TIME APPROACH, WORK ON, OR ENTER A HIGH VOLTAGE AREA WITHOUT PROPER AUTHORIZATION.

5.4 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 ENERGIZED UNTIL TESTED AND PROVEN OTHERWISE. TEST ALL ELECTICAL CABLES TO ENSURE THEY ARE DE-ENERGIZED PRIOR TO WORKING ON THE ITEM.

6.0 QUALITY ASSURANCE REQUIREMENTS: None additional.

7.0 STATEMENT OF WORK REQUIRED

7.1 Tag-Out all required systems and equipment.

7.2 Open and clean expansion tanks in accordance with Work Item 021.

7.3 Remove all residual coolant from the system and dispose of in accordance with Work Item 023 “Hazardous Waste Management and Disposal” and all Federal, State, and Local regulations.

7.4 Completely drain down systems of MAXIGARD residual and pump off prior to start of flushing activities.

7.5 Use References 2.0 as guidance.

7.6 To clean and treat system will require a minimum of two complete flushes and one freshwater cooling water changeout.

7.7 Connect hoses to high and low point drains. Flush all HTFW, LTFW systems using a 2"-3" (150-200 gpm) Wilden pumps (or equivalent), Heater (used to heat the system water).

7.8 Filter all deposits from entering return line back into each system.

7.9 Connect circulating unit tank and circulation pump equipment.

7.10 The path of the flushing water should be from the tank and circulation pump to the lowest point of the cooling system, through engine and returning to the tank.

7.11 Fill cooling system with deionized water. Start the recirculation pump and commence heating and maintain flushing water temperature of 140-180ºF.

7.12 Continue circulation and maintain the flushing water temperature for a minimum of 8 hours.

7.13 Drain the equipment. As soon as the flushing water level has dropped below the top access ports, open them and thoroughly flush with deionized water. Continue flushing while draining. Remove all loose deposits by flushing or manual cleaning.

7.14 Repeat flushing process until flush water is clear and not cloudy with no visible suspended solids.

7.15 Fill the systems with deionized water.

7.16 Add LIQUIDEWT at 13.0 liters/ton of system capacity. OEM representative shall monitor solution to ensure proper ratio is achieved.

7.17 Inspection/Test

7.17.1 Verify and inspect no leaks and system is complete and ready for service.

7.18 Manufacturer Representative:

Representative to oversee flushing of system and take all test samples.

Drew Marine 4855 Brookside Ct., Suite E, Norfolk, VA 23502 Office 1-757-853-1986 Mobile 1-757-339-1986

Fax 1-757-853-6455 POC: Kevin Gilbert kagilbert@drew-marine.com

8.0 GENERAL REQUIREMENTS: None additional.

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