Deck Preserve WI.doc

63121_0623_FLT

REC_63120_Dks_Exterior_FLT_418' WMSL (751 CGC WAESCHE) (0617)

WORK ITEM 1: Decks - Exterior, Preserve, Non-Skid MIL-PRF-24667 System,

1. SCOPE

1.1 Intent. This work item describes the requirements for the Contractor to preserve the following exterior deck surfaces:

· 02 Level: All exterior steel deck surfaces.

· 02 Level: Pilot House Top (steel surfaces).

· 02 Level: House Top (steel surfaces).

1.2 Government-furnished property.

None.

2. REFERENCES

Coast Guard Drawings

Coast Guard Drawing 750 WMSL 801-1, Rev - , Booklet of General Plans Coast Guard Drawing 750 WMSL 631-002, Rev P, Paint Schedule, (ASC631002)

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

Other References

MIL-PRF-24667C, May 2008, Coating System, Non-Skid, for Roll, Spray, or Self-Adhering Application QPL-24667, Qualified Product List (Military) of Products Qualified Under Detail Specification MIL-PRF-24667, Coating System, Non-Skid, for Roll, Spray, or Self-Adhering Application

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, (Vessel component, space, and equipment protection). Specific areas/ equipment/ components to be protected include, but are not limited to:

· Adjacent vertical (beyond what is specified in paragraph 3.3.2 (Surface preparation and coating application).

· Ventilation intakes.

· Deck fittings.

· Deck equipment.

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:

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

3.2 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.

3.3 Preservation requirements particulars. The Contractor must accomplish the following tasks. Use Coast Guard Drawing 750 WMSL 801-1 as guidance.

3.3.1 Pre-surface preparation wash. Prior to accomplishing surface preparation, accomplish low-pressure (less than 5,000 psi) fresh water wash of all affected surfaces, to remove soluble chlorides and other surface contaminants. Capture, contain, and dispose of wash water for proper disposal in accordance with all Federal, state and local regulations.

3.3.2 Surface preparation and coating application. Prepare and coat the deck surfaces designated in paragraph 1.1 (Intent), including bitt and chock foundations, machinery rack guards and machinery foundations, hatches and hatch guards, stanchion sockets, vent pipes, angle coaming area, and approximately six inches up all adjacent vertical surfaces (as applicable); use the system specified for “Weather Decks, Non-Skid, MIL-SPEC Coating for Steel or Aluminum”, in SFLC Std Spec 6310, Appendix A (Cutter and Boat Exterior Painting Systems).

3.3.2.1 Substrate inspection. After completion surface preparation and before coating application, perform a visual inspection of the prepared substrate, and submit a CFR.

3.3.2.2 Color selection. Select and use Dark Gray (36076) as the finish/top coat color.

3.3.2.3 Non-skid exempted areas. Apply top color coating only (do not apply non-skid topcoat) over vertical surfaces, and the following areas:

· Within two inches of deck fittings and protrusions.

· Within six inches of deck coamings, bulkheads, and deck edges.

· Within two inches of deck foundations (two inches measured from outermost portion of foundation, for example, foundation brackets on anchor windlass).

· Waterways.

3.3.2.4 Non-skid surface appearance and texture. The non-skid surface must show a pattern of peaks and ridges. The ridge profile must be continuous and reasonably uniform. Peaks and ridges must be generally in the same direction (fore and aft), approximately ½ to 1 inch apart, and approximately 1/16 to 3/32 inches high. All weld seams must be cross-rolled from a minimum of 3 inches on either side of the weld.

3.3.3 Surface preparation optional methods. The Contractor has the option of using either high/ultrahigh pressure water jetting or abrasive blasting to achieve the required surface preparation, prior to application of the coating system specified in 3.3 (Preservation requirements particulars). The Contractor may add abrasives to the waterjet stream, for one or both of the following reasons:

· Achieving greater productivity.

· Achieving the required surface profile.

CAUTION!

Waterjetting without abrasive addition does not provide any additional anchor profile to the surface, beyond what was present after the previous surface preparation. Abrasive may be introduced to the waterjet stream, to achieve required surface profile and/or greater productivity.

3.3.3.1 Surface preparation water quality. The Contractor must ensure that water in all surface preparation tasks, including pre-surface preparation wash and waterjetting is of sufficient purity and quality that it does not prevent the surface being cleaned from achieving the required degree of surface cleanliness or non-visible contamination criteria. Ensure that surface preparation water does not contain sediments or other impurities that are destructive to the proper functioning of the cleaning equipment.

3.3.3.2 Initial removal of the coating system around deck edges, fittings, and deck coaming may be by power tool cleaning in accordance with SSPC-SP-11.

3.3.4 Containment. The Contractor must provide suitable means to contain generated dust, waste water, paint chips, and spent abrasives. When net barriers are used, the mesh size of the netting material must be small enough to ensure that the abrasives will be contained. In addition, net barriers, when used, must be overlapped where attached to stanchions, and anchored at the bottom for the entire net’s length between stanchions, to limit the clean–up and localize the blast media.

3.3.4.1 If a containment system is not used for surface preparation dust and debris and coating application overspray during pier side/dockside preservation, the following must be adhered to:

· All surface preparation tools/equipment must be vacuum-shrouded.

· Coatings must be applied by brushing or rolling.

3.3.4.2 If ambient condition parameters cannot be met for the full duration of preservation work, the Contractor must provide suitable tenting and all equipment necessary to satisfy requirements in accordance with SFLC Std Spec 6310, Paragraph 3.1.5, at no additional cost to the Government.

3.3.5 Polyurethane coatings. The Contractor must be aware that two-part polyurethane primers, membranes, color toppings, and non-skid are not authorized for application on Coast Guard vessels, even if listed on QPL-24667.

3.4 Alternative non-skid coatings. If a Change Request has been authorized and released, the Contractor may select and apply one of the following:

· A low temperature cure system, conforming to MIL-PRF-24667, Type VIII, Composition G.

· A flexible membrane system, conforming to MIL-PRF-24667, Type III, Composition G, with the intermediate membrane.

NOTES

1. The low temperature system is only authorized for application at temperatures between 35-45 degrees F.

2. The Type III non-skid system with the intermediate membrane should only be used over deck surfaces that undergo a great deal of flexing, or over uneven deck surfaces where flatness is required.

3.5 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).

NOTE

Coast Guard personnel will operate all shipboard machinery and equipment.

3.6 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

4.1 Definitions.

4.1.1 Coaming. Vertical raised sections of deck plating around an opening that provide a frame and/or deflect water, such as around a hatch or gooseneck.

4.2 Unit responsibilities. The ship's force will be responsible for the following:

· Removing and reinstalling all deck drain gratings.

· Plugging deck drains.

· The Coast Guard Inspector will inspect Contractor furnished non-skid system (primer and non-skid) prior to application, ensuring that the system is qualified as "UV/LSA", as specified in QPL-24667.

· Ensuring no engine operation or stack emissions occur at any time during resurfacing.

· Restricting access to the work area to only essential personnel.