PW Sounding Tubes Renew SOW.pdf

USCGC DEPENDABLE (WMEC-210B) DOCKSIDE AVAILABILITY FY2022

76 (Rev-0)

S20_0031_50600_SRH_1021_626

WORK ITEM 18: Sounding Tubes, Renew

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to crop and renew 12 linear feet of sounding tubes and associated striker plates for potable water tank 4-174-1-W and void 4-172-2-V.

1.2 Government-furnished property.

None.

2. REFERENCES

COAST GUARD DRAWINGS

Coast Guard Drawing 627 WMEC 085-263, Rev A, Tank Capacity Curves

Coast Guard Drawing 627 WMEC 506-001, Rev C, Diagram Sounding Tubes & Air Escapes

Coast Guard Drawing 627 WMEC 506-002, Rev E, Arrangement of Sounding Tubes & Air Escapes

COAST GUARD PUBLICATIONS

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

Surface Forces Logistics Center Standard Specification 0740 (SFLC Std Spec 0740), 2020, Welding and Allied Processes

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

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

Manufacturers Standardization Society of the Valve and Fittings Industry (MSS), SP-58, 2018, Pipe Hangers and Supports – Materials, Design, Manufacture, Selection, Application and Installation

77 (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:

Potable water tank 4-174-1-W (2500 gallon capacity)

Potable water tank 4-712-0-W (6000 gallon capacity)

Void 4-172-2-V (600 gallon capacity)

Stiffeners

Potable water piping

Electrical Work bench

Ladder

TLI

Electrical cabling

Bulkhead

NOTE

Vessel may come in with less tank fluid contents than specified above.

3.1.4.1 Fluid removal. Remove up to 3000 gallons of potable water and 50 gallons of oily water to facilitate gas-freeing.

3.1.4.2 Fluid disposition, disposal. Dispose of all removed fluids in accordance with all applicable Federal, state, and local regulations. Refer to paragraph 4.1 (Tank content restoration).

3.2 Renewal. The contractor must accomplish the following as designated by the Coast Guard Inspector and using Coast Guard Drawings 627 WMEC 085-263, 627 WMEC 506-001, and 627 WMEC 506-002, as guidance.

Crop and renew 12 linear feet of 2-inch schedule 40 galvanized steel, ASTM A53 grade A piping and galvanized steel striker plates for potable water tank 4-174-1-W and void 4-172-2- V

3.3 Plug log. The Contractor must keep a written record of all plugs put in any tanks vents. A separate list shall be kept for each tank being entered.

78 (Rev-0)

3.3.1 Ensure that all plugs are removed from each tank upon completion of work in the tank.

3.3.2 Ensure the plug log is available to the Coast Guard inspector when the inspector is performing his close-out inspection on each tank.

3.4 Tank content removal. The Contractor must remove and dispose of all fluids and/or residues 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), when this item is being executed in a drydock availability. The Contractor must refer to the Coast Guard drawings listed in Section 2 (References) for guidance in accomplishing this work item.

3.5 Tank cleaning. The Contractor must remove tank cover(s); clean tank interior surfaces free of all foreign materials, such as sediment, sludge and bacterial growth. Remove all persistent residues, taking care not to damage any tank coating system. Remove cleaning media and residues continuously from the tank during the washing process. Remove any residual wash media and wipe up residual moisture with clean lint-free cloths. Collect, contain, and dispose of all wash media, residues, and cleaning materials in accordance with all Federal, state, and local regulations

3.6 Inspection. The Contractor must visually inspect all tank 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:

Tank structural condition.

Inaccessible areas, if any.

Condition of tank coating, including measurements taken, percentage, location, and type of coating failure.

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

Sounding tube and striker plate condition.

Suction and discharge piping condition.

Fastener material and condition.

3.7 Tank closing. The Contractor must notify the COR at least 24 hours prior to closing the tank(s). After satisfactory inspection by the Coast Guard Inspector, and completion of all authorized repairs, close tank manhole cover(s) with new gasket material conforming to ANSI/NSF 61. Renew all stud cotton grommets (as applicable) upon reinstallation of manhole cover(s).

3.7.1 The Contractor must renew up to 100% of missing or damaged nuts and washers.

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

3.9 Pipe hanger installation. The Contractor must furnish, fit, and install new pipe hangers in accordance with MSS SP-58.

79 (Rev-0)

3.10 Touch-up preservation. The Contractor must prepare and coat all new and disturbed surfaces to match existing adjacent surfaces in accordance with SFLC Std Spec 6310, paragraph 3.1.13 (Touch-ups and minor coating repairs.)

3.11 NDE. The Contractor must perform NDE of the newly installed sounding tube piping in accordance with SFLC Std Spec 0740, Appendix C. If selected NDE method requires coating removal, perform subsequent touch-up preservation in accordance with SFLC Std Spec 6310, paragraph 3.1.13 (Touch-ups and minor coating repairs). Submit a CFR.

NOTE

Common NDE methods not requiring coating removal include, but are not limited to the following:

a. Radiographic Testing (RT).

b. Ultrasonic Testing (UT).

c. Eddy Current Testing (ET).

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

3.11 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.

4. NOTES

This section is not applicable to this work item.