SOW.docx

S25_000_51100_BAF_1125_75404

Chill Water System, Clean and Flush

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to clean and inspect the nine (9) FCUs on the main deck and the main chill water pipes in the overhead of the main deck.

1.2 Government-furnished property.

None

2. REFERENCES

Coast Guard Drawings Coast Guard Drawing 75C-WAGL-3801-23, Rev 3, CG 75404 Ventilation Systems Coast Guard Drawing 75C-WAGL 3802-22, Rev -, Heat & A/C Piping Coast Guard Drawing 75C-WAGL-3802-25, Rev 1, Chiller Condenser Cooling Wtr Arrg (75402-05) Coast Guard Drawing 75C-WAGL-3802-26, Rev 1, Heat & A/C Convector Arrgt (75404) NAVSEA Drawing 804-5959214, Rev-, Piping Insulation - Installation Details Coast Guard Publications Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2022, General Requirements Surface Forces Logistics Center Standard Specification 6310 (SFLC Std Spec 6310), 2022, Requirements for Preservation of Ship Structures Surface Forces Logistics Center Standard Specification 0740 (SFLC Std Spec 0740), 2022, Welding and Allied Processes Other References ASTM International (ASTM) D1330, 2004, Standard Specification for Rubber Sheet Gaskets ASTM International (ASTM) F683, 2010, Standard Practice for Selection and Application of Thermal Insulation for Piping and Machinery

3. REQUIREMENTS

3.1 General.

3.1.1 CIR. The Contractor must submit a CIR for the inspections listed in the following paragraph(s):

None.

3.1.2 Tech Rep.

Not applicable.

3.1.3 Protective measures. The Contractor must furnish and install all protective measures in accordance with SFLC Std Spec 0000, paragraph 3.3.3 (Vessel component, space, and equipment protection).

3.1.4 Interferences. The Contractor must handle all interferences in accordance with SFLC Std Spec 0000, paragraph 3.3.5 (Interferences). Known interferences include, but are not limited to the following:

Piping.

Insulation.

Valves and Strainers

3.2 Operational test - initial. Prior to commencement of work, the Contractor must witness an operational pre-test (by Coast Guard personnel) of all items or shipboard devices to be disturbed, used, repaired, or altered, to demonstrate existing operational condition. Submit a CFR.

3.3 System drainage. The Contractor must drain all affected systems and dispose of removed fluids in accordance with all applicable Federal, state, and location regulations. Ensure that the vessel’s deck surfaces are completely free of spilled water within one hour after system drainage.

Note The system has approximately 125 gallons of chill water. If the chill water is to be reused, it would need to be filtered before refilling the system.

3.4 Contamination prevention. The Contractor must take all precautions to prevent contamination of personnel and spaces in accordance with all applicable Federal, state, and local regulations.

3.5 Cleaning plan. The Contractor must establish a plan for cleaning the designated piping system, using Coast Guard Drawings as guidance, listing the step-by-step procedures necessary to ensure that all foreign debris is removed from the piping system.

NOTE

Although the Coast Guard prefers pressurized water as the cleaning fluid, the Contractor may propose chemical cleaning as an alternative, providing that the proposed chemical cleaning agent conforms to DOD-STD-2187 (where applicable), is environmentally safe, and pre-approved by the COTR. The Contractor must submit a MSDS to the COTR for all chemicals proposed for use.

3.5.1 Procedure requirements. Ensure that the procedure includes the following:

The 9 FCUs on the main deck should be disconnected and backflushed to clear debris.

Methods of cleaning, including mechanical and chemical cleaning.

All safety precautions required during cleaning operations.

List of qualified personnel who will operate machinery or handle chemicals (see paragraph 3.11 (Personnel qualification) herein).

The main chill water pipes in the overhead of the main deck, and any additional fittings necessary.

Sequence of each location that ensures all piping sections will be cleaned and all foreign debris removed.

3.5.2 Plan submittal. Submit the written plan to the COTR for approval at least 48 hours prior to commencing cleaning operations.

3.6 Cleaning operations. Upon approval of the plan, the Contractor must proceed with the cleaning of the main chill water pipes in the overhead of the main deck at no more than 25-foot intervals, as follows:

3.6.1 Pumps and valves. Replace system tank valve(s) with temporary spool piece(s). Visually inspect system pumps and valve(s); submit a CFR. Upon completion of work, reinstall the removed tank valve(s) with new gaskets.

3.6.2 Cleaning. Continue cleaning until all of the following conditions are met:

All visible calcium carbonate deposits, solid deposits and build-up are removed from the pipe walls.

Discharge water from the piping being cleaned is free of all visible scale and deposits.

3.6.3 Waste disposal. Dispose of all cleaning fluids and debris in accordance with all applicable Federal, state, and local regulations. Remove all unused chemicals from USCG property immediately upon completion of work item.

NOTE

Do not drain any fluids (including fresh water) into any space, bilge, or exterior location.

3.7 Gasket renewal. The Contractor must reinstall all removed valves and fittings with new gasket material conforming to ASTM D1330.

3.8 Operational test – post repairs. After completion of work, the Contractor must witness an operational test (by Coast Guard personnel) of all disturbed piping to prove satisfactory operating condition. Submit a CFR.

3.9 Leak test. After all system components are reinstalled, the Contractor must test all disturbed piping for leaks, as follows:

Plug all system openings (except the highest) and fill system with water to the point of overflow. Ensure that the water level does not go down (without adding any water) for sufficient time to inspect the entire system (no less than 15 minutes).

Closely monitor the system for leaks. Repair all leaks detected.

Repeat test and inspection until no leaks are detected.

Submit CFR.

3.10 Personnel qualification. The Contractor must ensure that personnel accomplishing this work are qualified and experienced in operating the pressurized water system and handling the chemicals. For each operator/cleaning technician, submit documentation of applicable experience and training obtained within the last twelve months along with the Cleaning Plan (see paragraph 3.6.2 (Plan Submittal)).

3.11 Inspection. The Contractor must inspect the piping interior using a borescope in the presence of the COTR, to verify that all solid deposits visible to the unmagnified eye have been removed. Continue the cleaning process until all visible solid deposits are removed from the pipe walls.

3.12 Piping insulation installation. The Contractor must install new insulation materials over the exposed pipe surfaces at thicknesses appropriate to the application and temperature ranges specified in ASTM F683 Tables identified in Table 1 below and in accordance with details in NAVSEA Drawing 804-5959214:

Associated pipe hangers Valves Fittings Flanges

TABLE 1 - PIPING SYSTEMS INSULATION INSTALLATION REFERENCES

ASTM F683 TABLES

Interior gas, steam, hot water, and oil piping

125 to 1200 Deg. F

S1.1; S1.2; S1.4

Interior refrigerant, hot water, cold water, and chill water piping

-20 to +180 Deg. F

S1.1 and S1.5

3. 12.1 Coat the newly installed insulation using the system specified for “Insulation Surfaces, Fiberglass Sheet/Closed Cell PVC Foam” in SFLC Std Spec 6310, Appendix B (Cutter and Boat Interior Painting Systems).

4. NOTES

This section is not applicable to this work item.

POC: Brian Glass, brain.h.glass@uscg.mil, 251 441 6484 Vendor shall coordinate all work and deliveries through POC.