SOW CGC NORVELL Sewage Cleaning.pdf

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Sewage System Clean

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to clean the sewage system (e.g. tanks, piping, etc.).

TABLE 1

USE OF COAST GUARD SEWAGE DISPOSAL FACILITIES (PARA 3.3.5.2)

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing 154 WPC 127-302, Rev C, Potable Water & Sewage Tank Fabrication Details

Coast Guard Drawing 154 WPC 506-201, Rev A, Fills Vents, Sounds, and Overflows Coast Guard Drawing 154 WPC 506-301, Rev -, Fills, Vents, Sounds, Overflows Diagram Coast Guard Drawing 154 WPC 528-301, Rev B, Grey Water System Diagram Coast Guard Drawing 154 WPC 593-201, Rev F, Sewage System Arrangement Coast Guard Drawing 154 WPC 593-301, Rev C, Sewage System Diagram Coast Guard Drawing 154 WPC 593-303, Rev A, Sewage Control System Coast Guard Drawing 154 WPC 601-302, Rev D, General Arrangement Coast Guard Drawing 154 WPC 633-301, Rev C, Cathodic Protection System

COAST GUARD PUBLICATIONS

Surface Forces Logistics Center Standard Specification 0000 (SFLC Std Spec 0000), 2020, General Requirements

USCGC MARGARET NORVELL (WPC-154) DOCKSIDE AVAILABILITY FY2023

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Surface Forces Logistics Center Standard Specification 6310 (SFLC Std Spec 6310), 2020, Requirements for Preservation of Ship Structures

OTHER REFERENCES

ASTM International (ASTM) D1330, 2010, Standard Specification for Rubber Sheet Gaskets

3. REQUIREMENTS

3.1 General.

3.1.1 CIR.

None

3.1.2 Tech Rep.

None.

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).

3.1.5 Temporary Sanitary and Sewage Facilities. Whenever sewage or grey water collection service is disrupted due to Contractor repairs, the Contractor must provide temporary facilities in accordance with SFLC Standard Spec 0000 par 3.2.11.

3.1.6 Refer to all references beneath section 2 above, as applicable.

NOTE

Be aware that the grey water system has few isolation valves and many openings that must be plugged or blanked to contain cleaning media.

Be aware that AC condensate drains into the Grey Water Tank at 8 separate locations. Any temporary disruption or degradation of climate control must be fully addressed by the cleaning plan.

For these reasons, based on lessons learned, it is suggested that chemical cleaning be used on sewage piping and grey water system piping be cleaned mechanically (e.g. waterjetting, etc.)

3.1.8 Cleaning Plan. No later than 7 days after the arrival conference, and prior to the start of cleaning work, the Contractor must submit a cleaning plan CFR that contains the following:

USCGC MARGARET NORVELL (WPC-154) DOCKSIDE AVAILABILITY FY2023

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A list of qualified personnel who will disassemble machinery or handle chemicals.

An SDS for every chemical proposed for use.

A step by step description of the procedures and methods that will be used to clean the systems A list of locations in the sewage and grey water piping system where piping lines will be opened and components will be removed. At a minimum the piping must be opened at 3 separate sewage system clean-out locations and 3 separate grey water system clean-out locations for “before and after” inspections to determine the extent of cleaning required and to verify cleaning was adequately performed. These locations must be pre-approve by the COR and included in the cleaning plan CFR.

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

3.2 Cleaning and Inspection Requirements. After the COR approves the “Cleaning Plan” the Contractor must clean the piping and tanks and in accordance with the approved “Cleaning Plan”, and as described below. Clean, in their entirety, all sewage and grey water system interior surfaces (e.g. sewage and grey water ppg interiors, pump interiors, valve interiors, all sewage and grey water tank vent lines interiors, sewage vacuum switch manifold interiors, fire main sprinkler pipe interiors and spray hole interiors in main sewage tank used to flush sewage tank, overboard/to shore connection discharge pump and all related valve and pipe interiors, etc.) that may come in contact with sewage or grey-water, by removing all obstructions, clogs, uric scale, and waste build-up on piping and component interiors, ensuring subsequent free unobstructed flow of waste solids and fluids.

NOTE

Depending on the condition of the system at the contract start date, chemical cleaning may not adequately remove all obstructions, scale, and build-up present. More intrusive cleaning methods, such as pressure washing, flexible auger cleaning, or other mechanical means of cleaning, may be required to remove all obstructions, scale, etc. These more intrusive methods are in scope of this work item and the Contractor may be required to use one or more them, in the appropriate quantities, to achieve minimum cleaning requirements.

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NOTE

Before filling a system with descaler ensure all openings below the fill point are blanked off or plugged.

3.2.1 Chemical Cleaning of Piping. When chemically cleaning piping and component interiors use a commercially available biodegradable sewage/grey-water system descaler (e.g. SEW CLEAN, etc.) safe for use on stainless steel. Fill the systems with descaler and hold for a long enough period to clean the systems as described above. After cleaning is complete drain and dispose of all sewage and grey water system contents.

3.2.2 Tank Cleaning. Interior surfaces of the Sewage Holding Tank 2-4-0-W, and sewage vacuum accumulation tank must be cleaned until free of all foreign materials, sediment, and sludge. Remove all persistent residues, residual wash media, and moisture with clean lint-free cloths. Remove, clean, and re-install all tank interior components (e.g. TLIs, limit switches, eductors, etc.). Renew all sewage tank and grey water tank zinc anodes that have lost more than 50% of their material using Government-furnished property, otherwise reuse the existing zinc anodes. Remove and dispose of all sewage system contents and collect, contain, and dispose of all wash media and cleaning materials in accordance with all applicable Federal, state, and local regulations. Remove all unused chemicals from USCG property immediately upon completion of work item.

3.2.3 Inspections. After cleaning, inspect the piping interior at the locations specified in the “Cleaning Plan” using a borescope in the presence of the COR, verify that all solid deposits, visible to the unmagnified eye, have been removed. Visually inspect all system components (e.g. TLIs, limit switches, pressure switches, tank interior surfaces, fasteners, gasket seating surfaces, manhole cover surfaces, etc.)

for excessive wear, damage, and all other notable discrepancies. Open and vacuum-clean the control panel assembly and inspect for any indications of overheating or loose wiring or connections. Submit a

CFR.

3.2.4 Miscellaneous. Do not drain any fluids (e.g. sewage, grey water, fresh water, etc.) into any space, bilge, or exterior location. Take all precautions required to prevent contamination of personnel and spaces in accordance with all applicable Federal, state, and local regulations. Renew all disturbed soft components (e.g. seals, gaskets, o-rings, etc.). Do not use the sewage pump installed in the system to offload sewage system contents.

3.2.5. Plug log. Plug all unattended openings in the system. Plugs must be fitted with a lanyard, ring or other device to prevent loss of the plug inside the system. Create and maintain a written log of each plug that specifies the location of each. Remove and dispose of all plugs upon completion of work. Furnish the plug log to the Coast Guard Inspector during the performance of close-out inspections.

3.2.5.1Use of Coast Guard Sewage and Grey Water Disposal Facilities. If “YES” is denoted in Table 1 – (Use of Coast Guard Sewage and Grey Water Disposal Facilities), beneath paragraph 1.1 (Intent), the Contractor may offload and dispose sewage and grey water system contents into the Coast Guard pier facility tanks in lieu of a Contractor furnished tank truck, otherwise the Contractor must dispose of all waste using the Contractor’s disposal facilities.

3.3 Closing tanks. The Contractor must notify the COR at least 24 hours prior to closing the tank. After completion of all authorized repairs and after the COR inspects all work performed, close the tanks.