Partial PW tank preserve SOW.pdf

USCGC DEPENDABLE (WMEC-210B) DOCKSIDE AVAILABILITY FY2022

100 (Rev-0)

63110_ESD_1021_FLT

REC_12314_FLT_210’ WMEC ‘B’ Class (ALL) (0320)

S21_0073_12314_SRH_1121_626

WORK ITEM 25: Tanks, Potable Water, Preserve, Partial,

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to prepare and coat a portion of the surfaces of the following tanks as designated:

TABLE 1 - TANKS

TYPE OF TANK LOCATION CAPACITY

- 95%

(GALLONS)

% OF TANK

COATING

REPAIR

LOW

SUCTION

(GALLONS)

Potable Water 4-172-0-W 6,148 33 160 Potable Water 4-174-1-W 2,480 33 40 Potable Water 4-174-2-W 2,480 33 40

1.2 Government-furnished property.

None.

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing 627 WMEC 533-001, Rev K, Diagram Hot & Cold Potable Water System

Coast Guard Drawing 627 WMEC 533-002, Rev H, Arr of Hot & Cold Potable Water

COAST GUARD PUBLICATIONS

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

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

Surface Forces Logistics Center Standard Specification 8636 (SFLC Std Spec 8636), 2020, Temporary Hull Accesses

OTHER REFERENCES

American National Standards Institute/NSF International (ANSI/NSF) 61, 2015, Drinking Water System Components - Health Effects

American National Standards Institute/American Water Works Association (ANSI/AWWA) C652, 2011, Disinfection of Water-Storage Facilities

101 (Rev-0)

3. REQUIREMENTS

3.1 General. The Contractor must refer to the Coast Guard drawings listed in Section 2 (References) for guidance in accomplishing this work item.

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).

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:

Bulkheads

Decks

Piping

Manhole covers

Repair locker gear

Towing line

EM shop

Hawser & Rescue Equip Stowage space

Ladderwell

Voids 4-172-1-V and 4-172-2-V

3.2 Temporary access openings. Due to limited access to work areas, the Contractor may, with express permission of the KO (via submission of a CFR), cut access holes to facilitate accomplishment of the work specified herein. Perform all work required to open and close the access openings in accordance with SFLC Std Spec 8636.

3.3 In-process quality control measures. The Contractor must abide by all the safety, preservation, and quality control requirements specified in SFLC Std Spec 0000, paragraph 3.2.4.2 (In-process QC measures for “critical-coated surfaces”). Surfaces being preserved are considered “critical-coated surfaces”.

3.4 Tank content removal. The Contractor must remove and dispose of all tank contents in accordance with all applicable Federal, State, and local regulations. The Contractor must notify the Dockmaster prior to filling or draining the potable water tank(s).

3.5 Surface preservation. The Contractor must remove and retain the tank manhole cover(s). Prepare and coat the designated tank interior surfaces, using the system specified for "Tanks and Voids (Potable Water Tanks)" in SFLC Std Spec 6310, Appendix B (Cutter and Boat Interior Painting Systems). Power tool clean all affected surfaces to “bare metal”, in lieu of using abrasive blasting; and feather edges of existing

102 (Rev-0) intact coating to the prepared areas, in order to provide a smooth transition with the new paint. Select finish/top coat color to match existing adjacent surfaces.

3.5.1 The Contractor must ensure heated air is used if necessary to maintain the proper temperature during application and cure. Ventilation must be a continuous airflow with a minimum of one complete air change every four (4) hours.

3.5.2 The Contractor must ensure tanks are cured in accordance with the manufacturer’s instructions for NSF/NEHC certification under the same conditions before being filled.

NOTE

Typical curing times are at least 7 days, and range up to 14 days or longer, depending on the paint selected, amount of surface area covered, and environmental conditions. See paint manufacturer’s recommendations for specific application.

CAUTION

Verify application and cure requirements with paint manufacturer prior to paint purchase and application. Lack of attention to environmental conditions can adversely impact paint system cure, cause unnecessary contract time delays, and negatively impact crew health and vessel habitability when tanks are put back into service.

DO NOT assume paint Product Data Sheet to be accurate. Contact paint manufacturer directly to verify, as formulations change and new application information may be available.

3.5.3 The Contractor must ensure freshly painted potable water tanks are rinsed at least twice with freshwater before being disinfected and put into service.

3.6 Inspection. After surface preparation and before coating application, the Contractor must visually inspect all interior surfaces; including, but not limited to bulkheads, floor and overhead plating, structural members, manhole cover surfaces, fasteners and gasket seating surfaces. Submit a CFR including the following, as applicable:

Structural condition

Inaccessible areas

Tank level indicator (TLI) and/or float switch condition

Sounding tube and striker plate condition

Suction and discharge piping.

3.7 Tank closing. The Contractor must ensure that the tank(s) remain open for at least 24 hours after completion of the tasks specified above. Notify the COR at least 24 hours prior to closing the tank(s).

After satisfactory inspection by the Coast Guard Inspector and after all authorized repairs, accomplish the following:

Reinspect all TLIs, as applicable, to verify proper operation. Submit a CFR.

Close tank manhole cover(s) with new gasket material conforming to ANSI/NSF 61 and new

103 (Rev-0) cotton stud grommets (as applicable).

3.8 Tank disinfecting. After all other work involving the potable water system and tank closing have been completed, the Contractor must disinfect and treat the affected potable water tank(s) and associated disturbed piping and components, as necessary to meet or exceed the requirements of AWWA C652.

After disinfecting the tank(s), remove and dispose of all treated water in accordance with all Federal, state and local regulations. Ensure no one enters the tanks once disinfection is completed.

4. NOTES

This section is not applicable to this work item.