USCGC MARIA BRAY GREY WATER TANK OPEN AND INSPECT

USCGC MARIA BRAY (WLM-175) DOCKSIDE AVAILABILITY FY2024 122 (Rev-0)

59320_ESD_0323_FLT WORK ITEM 26: Grey Water Piping, Clean and Flush 1. SCOPE 1.1 Intent. This work item describes the requirements for the Contractor to clean the grey water piping system. 1.2 Government-furnished property. None.

2. REFERENCES COAST GUARD DRAWINGS Coast Guard Drawing 175 WLM 593-001, Rev G, Sewage and Waste Water System Diagram COAST GUARD PUBLICATIONS Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2022, General Requirements OTHER REFERENCES 3. REQUIREMENTS 3.1 General. 3.1.1 CIR. 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). USCGC MARIA BRAY (WLM-175) DOCKSIDE AVAILABILITY FY2024 123 (Rev-0) 3.1.4 Interferences. The Contractor must handle all interferences in accordance with SFLC Std Spec 0000, (Interferences). Known interferences include, but are not limited to the following:

Grey water pumps 3.2 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. 3.3 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 3.5.6.2). NOTE Coast Guard personnel will operate all shipboard machinery and equipment. 3.4 Operational test, initial.

Prior to commencement of work, the Contractor must witness Coast Guard personnel perform an initial operational test of all items or shipboard devices to be disturbed, used, repaired, or altered, to demonstrate existing operational condition. Submit a CFR. 3.5 Piping hydrojet cleaning. The Contractor must perform the following work: 3.5.1 The Contractor must clean and flush approximately 250 linear feet of grey water system piping, shown on Coast Guard Drawing 175-WLM 593-001.

3.5.2 Prior to commencing work, coordinate with the Coast Guard Inspector. Determine required down times for affected piping system. Determine the feasibility/need for the piping system to be split to minimize system down time. rain system fore and aft by closing isolation valves in the drainage system.

Work on only one section of the plumbing drain system at a time to allow use of toilet and shower facilities in the other 3.5.4 Using the referenced Coast Guard drawings as guidance, hydro blast the internal surfaces of all of the plumbing drain piping. Hydro blast pressure must be at least 2500 psig at the discharge nozzle in all piping to ensure removal of all salts and scale from piping internal surfaces.

NOTE will provide an assistant to the Contractor to show the Contractor the location of clean-out connections within the plumbing drain system. 3.5.4.1 Open each of the clean out connections as required to clean and hydro blast all of the internal piping within the system. Catch any fluid that drains from the clean out connections when it is opened and clean up any spills using bleach to disinfect the spill after cleaning.

3.5.4.2 It may be necessary for the Contractor to install additional clean-out connections to access all portions of the plumbing drain system. If additional clean-out connections are needed, a separate USCGC MARIA BRAY (WLM-175) DOCKSIDE AVAILABILITY FY2024 124 (Rev-0) specification item in this specification package must be authorized to install additional clean-out connections. 3.5.4.3 Empty and clean all connected grease traps, and dispose of waste in accordance with all Federal laws and regulations.

3.5.4.4 Hydro blast cleaning water may be collected in the ge shore tie connections. 3.5.5 Clean until all of the following conditions are met: All visible calcium carbonate deposits, solid deposits, grease and build-up are removed from pipe walls. Discharge water from the piping being cleaned is free of all visible scale and deposits. 3.5.5.1 Inspect the piping interior using a borescope in the presence of the COR, 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. 3.5.6 In the event that hydroblasting alone does not clean piping to required conditions, Contractor must use chemical cleaning methods. 3.5.6.1 Ensure that chemical cleaners do not damage the environment, heat exchanger or the vessel. 3.5.6.2 Submit the written plan for chemical cleaning to the COR for approval 96 hours before work is to commence.

The procedure must include products to be used, safety precautions, disposal requirements, sequence of events, etc. Submit a MSDS to the COR for all chemicals proposed for use. Changes to the chemical cleaning plan as written, need to be approved by the COR (and Facilities). 3.5.6.3 Chemical cleaning waste water 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. Do not drain any fluids (including fresh water) into any space, bilge, or exterior location. Sequence of each location that ensures all piping sections will be cleaned and all foreign debris removed. Flush twice the volume of the system cleaned with water to include 3 repeated pH tests between 6 and 8. The flushing water shall be collected and disposed by the Contractor. 3.6 Pumps and valves.

The Contractor must replace system tank valve(s) with temporary spool piece(s). Visually inspect system pumps and valve(s); and submit a CFR. Upon completion of work, reinstall the removed tank valve(s) with new gaskets. 3.7 Gasket renewal. The Contractor must reinstall all removed valves and fittings with new gasket material conforming to applicable referenced drawings. NOTE Coast Guard personnel will operate all shipboard machinery and equipment.

USCGC MARIA BRAY (WLM-175) DOCKSIDE AVAILABILITY FY2024 125 (Rev-0) 3.8 Operational test, post repairs. After completion of work, the Contractor must thoroughly test, in the presence of the Coast Guard Inspector and demonstrate all items or shipboard devices that have been disturbed, used, repaired, altered, or installed to be in satisfactory operating condition. Submit a CFR. 3.8.1 Leak test.

After all system components are reinstalled, the Contractor must test all disturbed piping for leaks, as follows, and submit a CFR: 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. 4. NOTES This section is not applicable to this work item