0959_A_UNDERWATER HULL CLEANING AND PAINTING-NWB(10YR)_TAOE_CCSI_REV 1.docx

USNS XXXXXX

(T-AOE X)

UNDERWATER HULL CLEANING AND PAINTING – NEAR WHITE BLAST (10 YR)

ENCLOSURE 2.2.1 DIELECTRIC SHIELD

ABSTRACT

The purpose of this item is to surface prepare and paint the vessel’s underwater hull.

REFERENCES/ENCLOSURES

References NAVSEADrawing No. 6360504, Docking Plan USNS SUPPLY (T-AOE 6) NAVSEA Drawing No. 603-6360521, Draft, Boot-topping and Ship's Name NAVSEA Drawing No. 500-6362745, Scupper Lips and Split Pipe Extensions Surface Preparation Standard, SSPC-SP WJ-1/NACE WJ-1, Waterjet Cleaning of Metals – Clean to Bare Substrate (WJ-1) (Available Commercially) Surface Preparation Standard, SSPC-SP10/NACE 2, Near White Metal Blast Cleaning (Available Commercially) PPG - MSC Paint Handbook PPG Product Data Sheets, Amercoat 240 and Amershield NSTM Chapter 633 – Cathodic Protection Enclosure Dielectric Shield

ITEM LOCATION/DESCRIPTION/QUANTITY

Location/Quantity Locations: Underwater Hull Quantity: Approximately 125,000 square feet Item Description/Manufacturer’s Data

1.1.1 Ship's entire underwater hull from the keel to the top of the boot-topping to include the rudder, rudder horn, stern frame transom, fairwaters, strut, skeg, bilge keels, sea chests, strainer plates, access plates/covers, rope guards, and attached appendages.

GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICE

Government Furnished Equipment (GFE): None Government Furnished Material (GFM)

Government Furnished Services (GFS)

PPG Coating Representative

NOTES

The contractor and all subcontractors, regardless of tier must consult the General Technical Requirements (GTR) to determine applicability to this work item. In performance of this work item, the contractor and all subcontractors regardless of tier must comply with the requirements of all applicable GTR’s including but not limited to GTR’s 1 through 7, 22, 23, 24, 28, and 29.

The contractor and all subcontractors, regardless of tier are advised to review other work items under this contract, including but not limited to Work items 901, 911, XXX, and XXX to determine their effect on the work required under this work item. Many of the definitions relating to performance of this work item are found in Work Item 001.

Solvents supplied as GFM are for viscosity control only. Solvents required for equipment clean-up are the responsibility of the contractor.

ABC-3 is a 5-year ablative Anti-Fouling system.

QUALITY ASSURANCE REQUIREMENTS: None additional

STATEMENT OF WORK REQUIRED

Coordinate with ship’s force to have associated equipment locked and/or tagged out per ship’s lock out/tag out policy. When the maintenance is complete, coordinate with ship’s force to have associated equipment unlocked and/or tagged in per ship’s lock out/tag out policy.

Blast and renew the underwater hull paint system using References 2.1.1 through 2.1.8 and Enclosure 2.2.1 as guidance.

Prior to the start of any surface preparation:

1.1.2 Record all hull markings, labels and weld bead lines documenting their information (text), size, color, positions and symbols to include, but not limited to, vessel NAME, IMO #, boot topping, drafts, plimsol, load lines, thruster, and bulbous bow. Submit a copy of the record to the OMT REP.

1.1.3 Note the condition of any damaged or missing overboard drain covers, port lights, sideport doors, NIXIE port covers, and ventilation louvers.

1.2 With assistance from ship’s force tagout:

1.2.1 Impressed current cathodic protection system

1.2.2 Marine growth inhibitor system

1.2.3 Fathometers/Depth Sounders

1.2.4 Speed Logs

1.2.5 All overboard discharges in way of surfaces being prepared and painted.

1.3 Provide manlifts and/or erect staging as required to access all applicable surfaces.

1.4 Paint material is to be stored within the Paint Manufacturer's recommended temperature range. When paint material is being applied, ensure that the material's temperature is within the Manufacturer's recommended range, but in any case, not less than 70° F.

1.5 Provide and maintain adequate lighting of a suitable nature during the course of all surface preparation, coating and inspection activities.

1.6 Masking

1.6.1 Prior to start of surface preparation, ensure that the vessel's equipment is protected from contamination and/or damage caused by blasting abrasive, dust or paint. Install masking, plywood covers, tarps, seals, blanks and filtering materials to prevent abrasives and foreign substances from entering the ship, machinery, piping, hatches, deck drains, ventilation systems, tank vents, valve stems, motor shafts, seals and temporary openings during blasting and painting operations. Measures to be taken include, but are not limited to, the following:

Plug open ends of pipes, drains, scuppers, vents and ducts.

Install protective covering on all normally unpainted surfaces.

Grease and wrap all valve stems and exposed portions of hydraulic cylinders.

Install stack covers on the main and auxiliary uptakes.

Install filter media on all fuel tank vents and air intake vents.

Install protective coverings on port lights, sideport doors, and NIXIE hatches in the freeboard.

Install protective coverings over all access cut openings.

Protect running rigging (cargo falls, davit falls, lifts, and cranes) and mooring lines which cannot be stowed or removed for the duration of blasting.

Overboard discharges for services which cannot be curtailed, such as reefer cooling water overboard, are to be carried-off by means of temporary scuppers and hoses in order to prevent recontamination of the hull after surface preparation.

Protective covering is to be inspected at regular intervals, but not less than at the start of each work shift. Degraded protective covering is to be repaired prior to the restart of work.

Contamination of the vessel and its equipment is to be reported to the OMT REP verbally immediately upon its discovery, followed by a written report within four (4) hours of the verbal notification. The contractor will be responsible for cleaning the contaminated equipment and showing that the contamination has not caused damage to same. Cost to repair equipment damaged by such contamination is to be borne by the Contractor.

1.7 Surface Preparation

1.7.1 All areas of the underwater hull are to be maintained in a wet condition until the high pressure water wash has been accomplished.

1.7.2 Immediately upon drydocking the entire hull from the keel to six inches (6") above the Deep Load Line including, but not limited to, appendages such as sea chests, strainer plates, thruster tunnels, bilge keels, struts and rudder is to be high pressure water washed to remove all marine growth (slime, grass, tube worms, and barnacles), peeling, blistered and flaking paint and salts. Equipment utilized is to maintain a minimum discharge pressure of 2,500 to 3,000 psi.

1.7.3 Solvent Cleaning the Underwater Hull using SSPC-SP1, Protective Coating Society, using biodegradable detergent to remove all dirt, oil, grease, soluble salts or other organic matter from the specified surfaces. Biodegradable cleaners or other eco-friendly methods/agents are to be used to the greatest extent possible.

1.7.4 Final wash-down is to be made with clean, fresh water at 2,500 to 3,000 PSI. Upon completion of all water washing, chloride testing is to be performed at a rate of no less than one (1) test per 500 Square Feet of surface.

1.7.5 The maximum allowable contamination concentrations are to be less than 10 ug/cm2 of chloride contaminants as determined by field or laboratory analysis using reliable, reproducible test equipment.

1.7.6 If contamination is found, additional water wash is to be performed. Additional tests are to be made as necessary to determine the extent of contamination and to prove the success of remediation.

1.7.7 Upon completion of the HP water washing and prior to the start of surface preparation take and record Dry Film Thickness readings of the existing coatings at a rate of one (1) spot reading per 500 SF. DFT gages are to be calibrated and spot readings shall be taken using SSPC-PA2, Measurement of Dry Coating Thickness With Magnetic Gages as guidance. Prepare a report showing the existing antifouling DFT. Assume that the DFT of the underlying anti-corrosive epoxy is an average of 11 mils. Submit the results of the DFT inspection to the OMT REP within 24 hours of completion.

1.7.8 All areas of the underwater hull are to be blasted to bare metal using one of the following approved methods for surface preparation:

Ultra High Pressure water jet using Reference 2.1.2; Surface Preparation Standard SSPC-SP12/NACE 5 as guidance. All water jetted areas are to be prepared to a WJ-2, NV-2 Condition. Ensure that the surface profile is 2 to 3 mils. No more than a light (L) grade flash rust is allowed on the steel at the time of coating application. If heavier flash rust is present, the surface is to be restored to a coatable condition by fresh water pressure washing at 2,500 to 3,000 psi and allowing it to dry or by other suitable means.

a. Dry abrasive blast using Reference 2.1.6; SSPC-SP10/NACE 2, Near White Metal Blast Cleaning as guidance. The surface profile achieved is to be angular in nature, and within the range set by the coating manufacturer’s product data sheet for the coating system being applied. Prior to the start of abrasive blasting the blast media is to be tested to ensure that it is not contaminated with chlorides, as determined by field or laboratory analysis using reliable, reproducible test equipment.

1.7.9 Profile is to be determined using a Keane-Tator (or equal) Surface Profile Comparator. Testex (or equal) Replica Tape is to be used at a rate of one (1) reading per 1,000 SF for verification. Replica Tape is to be mounted, identified as to location and included as part of the final paint report.

1.7.10 Whether prepared by abrasive blasting water jetting or other means, the edges of the surrounding intact coating are to be feathered in.

1.7.11 Regardless whether the surfaces are abrasive blasted or UHP Water Jetted, immediately prior to coating the surface is to be re-tested for non-visual surface contaminates at a rate of no less than one (1) test per 1,000 SF of prepared area. The maximum allowable contamination concentrations for surfaces prepared by means of dry abrasive blasting is to be less than 10 ug/cm2 of chloride contaminants as determined by field or laboratory analysis using reliable, reproducible test equipment. For those surfaces prepared by means of UHP water jetting, the limits of NV-2 found in the appendix of SSPC-SP12/NACE 5 will apply.

1.8 Coatings Application

1.8.1 Prior to application of any coating, the area to be painted is to be inspected and approved by the OMT REP and the MSC Paint Representative. This includes not only the initial coat of paint, but all subsequent coats as well. Ensure the conditions outlined in Reference 2.1.7 and the following are met prior to painting:

a. Surfaces are to be clean, dry and free of oil, grease or residue from abrasive blasting.

b. The edges of the spot blasted areas are to be feathered in.

c. The surface appearance of the prepared surface is to meet the definition established by the cited surface preparation standard used, either SSPC-SP12/NACE 5 or SSPC-SP10/NACE 2.

d. Air and substrate temperatures is to be within the range published by the paint manufacturer.

e. The substrate temperatures must register at least 5°F (3°C) above the Dew Point temperature.

f. The relative humidity is within the range set by the manufacturer’s product data sheet. In the event that there is no range established by the manufacturer, the relative humidity is to be no higher than 85 percent.

g. No coating is to be applied at temperatures below 35°F without prior written approval of the OMT REP.

h. Painting is not to be performed between the hours of sunset and 0800 without prior written approval of the OMT REP.

Any overspray is to be removed prior to the application of the next coat of paint in the system.

Material Safety Data Sheets for the products being applied are on the job site and have been reviewed by the personnel involved.

1.8.2 All coatings are to be prepared and applied using the manufacturer’s requirements outlined in the Product Data Sheets, Reference 2.1.8 as guidance.

1.8.3 Measure and record the following conditions in the presence of the OMT Paint Representative prior to the application of any paint coating:

a. Surface profile as determined by Keane-Tator Comparator (or equal) examination and/or replica tape

b. Non-visual surface contaminates at random locations

c. Surface temperature

d. Ambient air temperature

e. Dew point temperature and relative humidity

f. Over coating interval (curing time) since previous application

g. Dry Film Thickness (DFT) of previous coating taken at a rate of five per 1,000 square feet. DFT gages are to be calibrated, spot readings are to be taken and DFT tolerances are to be using SSPC-PA2, Measurement of Dry Coating Thickness with Magnetic Gages as guidance.

1.8.4 Random Wet Film Thickness (WFT) readings are to be taken during the application of coatings to verify correct millage are being applied.

1.8.5 All coatings are to be allowed to air dry. The minimum and maximum times to recoat are to be using the manufacturer's recommendations as guidance.

1.8.6 Apply the following coatings to the underwater hull using References 2.1.6 through 2.1.8 as guidance:

DIELECTRIC SHIELDS

(Impressed Current Cathodic Protection Anodes)

The dielectric shield coating surrounding impressed current cathodic protection (ICCP) anodes is to be applied as described in Reference 2.1.8 and shown in Enclosure 2.2.1.

The full underwater hull paint coating system (anti-corrosive and anti-fouling) is to be applied on top of the dielectric shield coating.

6. KEEL to LIGHT LOADLINE

BOOT TOPPING

USNS ARCTIC

(T-AOE 8)

UNDERWATER HULL CLEANING AND PAINTING – NEAR WHITE BLAST (10 YR)REV 1

959-1

UW HULL MARKINGS

1.8.7 The environmental conditions, DFT of each coat, cure and over coating intervals are critical to the application. The application of all coatings is to adhere to the Product Data Sheets and MSC Paint Rep. For weather conditions outside 35°F (-1°C) through 90°F (32°C) range consult the MSC Paint Rep for proper overcoat intervals.

1.8.8 Upon completion the hull is to be left to cure before being immersed in water. Drying times are greatly dependent on air and surface temperatures, film thickness, ventilation and relative humidity. The production schedule must consider this cure time. For planning purposes:

ABC-3

Curing time for DFT up to 6.0 mils

1.9 Upon completion the vessel is to be cleaned of all residues resulting from the surface preparation and painting operations. Remove all protective coverings, debris and replace all interferences removed in the performance of this item.

1.10 Reports

1.10.1 Prepare a Paint Report and submit same to the OMT REP within three (3) days of completing the coating application. The report is to include the following data:

a. The location, date and time of each coating application.

b. The air and substrate temperatures, relative humidity and dewpoint temperature at the time of each coating application.

c. Interval between coatings.

d. Dry film thickness readings of each coating.

e. Paint Manufacturer, Product Identification Number, color and Batch Numbers for each coat of paint applied.

f. Surface profile measurements of the metal substrate.

g. Results of testing for non-visible surface contaminants (soluble salts).

1.10.2 Painting: None additional

1.11 Manufacturer's Representative

1.11.1 A Government provided Paint Technical Representative will be in attendance, on the government’s account, to observe the surface preparation and coating application on the government’s behalf and to advise the OMT REP as to the quality, and appropriateness of the contractor’s efforts. He/She is not for supervision of the contractor’s workforce.

1.12 Preparation of Drawings: None additional

2.0 GENERAL REQUIREMENTS: None additional

The shields cover the metal substrate within 6 feet in any direction from an ICCP Anode and are usually oval in shape.

The inner shield coating is to be one coat of Evoqua Water Technologies (ex-U.S. Filter Electrocatalytic) “Capastic”™, Part No. 35524, applied to a minimum DFT of 100 mils, or other product as approved by NAVSEA. The inner shield is defined as the portion of the dielectric shield that extends 3 feet from the anode in all directions.

The outer shield coating is to be one coat of Evoqua Water Technologies (ex-U.S. Filter Electrocatalytic) “Capastic”™, Part No. 35524, applied to a minimum DFT of 22 mils, or other product as approved by NAVSEA. The outer shield is defined as the portion of the dielectric shield from the inner shield to a distance of 6 feet from the anode.

Capastic: NSN 8030-01-322-7777, Sealing Compound Within six inches of the anode, the dielectric material is faired up to the full thickness of the anode case (greater than 1 inch). Where the dielectric shield material fills the counter bore for the anode attachment hardware it is installed flush with the top surface of the anode case.

The full underwater hull paint coating system (anti-corrosive and anti-fouling) is to be applied on top of the dielectric shield coating.

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