0142_A_Tank_Coatings_Gray_WTR_and_FD_Waste_VRR17-057_Rev1.doc

USNS CHARLES DREW

(T-AKE 10)

HULL STRUCTURE

N33205-18-R-4252

18 DECEMBER 2017

ITEM NO. 142

CATEGORY "A"

MSC PM6/SA

TANK COATINGS (FOOD WASTE AND GRAY WATER)

1.0 ABSTRACT:

1.1 This item describes blasting, washing, and painting the Gray Water Collection Tank (3-77-4) and Food Waste Tank (3-77-2).

2.0 REFERENCES:

2.1 NAVSEA Dwg 802-7488866 Rev U - General Arrangement.

2.2 Surface Preparation Standard No. 10 (SSPC-SP-10) Blast to Near White Metal.

2.3 COMSCINST 4750.2 Preservation Instructions for MSC Ships.

2.4 PPG-PMC MSC Handbook.

2.5 SSPC Good Painting Practices volume 1, fourth edition.

2.6 SSPC Systems and Specification, volume 2, Eight Edition.

2.7 SSPC PA-2 Measurement of Dry Coating Thickness with Magnetic Gages.

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location/Quantity/Capacities:

3.1.1 Location:

- Gray Water Collection Tank, (3-77-4).

- Food Waste Tank, (3-77-2).

3.1.2 Quantity:

- Gray Water Collection Tank, (3-77-4), approximately 1500 SQFT.

- Food Waste Tank, (3-77-2), approximately 300 SQFT.

Note:

Areas are approximate and quantified from NAVSEA Dwg. Reference 2.1.

3.2 Item Description/Manufacturer’s Data:

None.

4.0 GOVERNMENT-FURNISHED EQUIPMENT/MATERIAL/SERVICES:

4.1 Government Furnished Equipment (GFE):

None.

4.2 Government Furnished Material (GFM):

4.2.1 Amerocoat 240, Off-White, Buff, and Red.

4.3 Government Furnished Services (GFS):

4.3.1 Paint Manufacturer’s Technical Field Service Representative.

5.0 NOTES:

5.1 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.

5.2 The contractor and all subcontractors, regardless of tier are advised to review other work items under this contract 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.

5.3 Grey Water and Food Waste Tanks shall require “Gas Free” certificate prior to Paint removal. Notify the Marine Chemist, Port Engineer and Chief Engineer prior to commencement of work for deck plate inspections.

5.4 Contractor to provide all staging and floating platforms necessary to perform work.

5.5 Cleaning and gas freeing shall be covered under Work Items 20 and 21. Closure of tank shall be covered under Work Items 20 and 21.

6.0 QUALITY ASSURANCE REQUIREMENTS: None Additional.

7.0 STATEMENT OF WORK REQUIRED:

7.1 Arrangement and Outfitting:

7.1.1 Work Area Preparation;

7.1.1.1 The Contractor and Ships Force shall document “as-found” conditions. All deficiencies shall be submitted to the Port Engineer for review.

7.1.1.2 Deficiencies noted during this inspection shall be corrected and the Port Engineer shall be given the opportunity to inspect and approve the corrective measures before work begins.

7.1.1.3 Provide containments required for proper working conditions and inspections.

7.1.1.4 Areas of concern are weld seams and frame/joints and appendages.

7.1.1.5 Using fresh water at 2,500 to 3,000 psi, wash down the interior of the tank. Remove all water generated by this operation, as well as any residual water found in the tank prior to the start of washing, and any foreign matter in the tank. Upon completion of all water washing chloride testing shall be performed at random locations. If contamination is found, additional tests shall be made as necessary to determine the extent of contamination and to prove the success of remediation. The maximum allowable contamination concentrations shall be less than 10 ug/cm2 of chloride contaminants as determined by field or laboratory analysis using reliable, reproducible test equipment. Upon completion of all water washing dry the tank.

7.1.1.6 Upon completion of the water washing and drying operations, the entire tank shall be blasted in accordance with SSPC - The Society for Protective Coatings (formerly Steel Structures Painting Council) Surface Preparation Standard SSPC-SP10, Near White Metal Blast. The surface profile achieved shall be a minimum of 2-4 mils.

7.1.1.7 Provide and erect all necessary staging required for proper working conditions and inspections. Provide and maintain adequate lighting of a suitable nature during the course of all surface preparation, coating and inspection activities as stated above.

7.1.1.8 Provide ventilation of sufficient size and type to maintain a proper working environment.

7.2 Structural:

7.2.1 Work Area Preparation;

7.2.1.1 During surface preparation, the use of dehumidification equipment is discretionary on the part of the contractor. However, it is expected that the entire tank be presented for inspection at one time. During the painting phase, dehumidification and forced air heating equipment shall be utilized. As a minimum, the equipment shall:

7.2.1.2 Maintain the temperature within the tank at a minimum of 70o F.

7.2.1.3 Effect a complete air change in the tank at least once every one-half (1/2) hour.

7.2.1.4 Maintain the relative humidity in the tank within the limits set by the paint manufacturer for the coating being applied.

7.2.1.5 Maintain a minimum of 5o F. differential between the air and substrate temperatures of the tank and the dew point, with the dew point being the lower temperature.

7.2.1.6 Ducting shall be run so as not to create hazards to personnel transiting the areas through which the ducting is run. Ducting shall further be maintained airtight and in good repair such that it does not contribute to contamination of the vessel's interior or equipment with grit, dust or paint.

7.2.1.7 Protect the vessel and its equipment from damage resulting from this work item. Measures to be taken include, but are not limited to, the following:

7.2.1.7.1 Controllers, motors, and similar electrical equipment in the vicinity of the tank and/or the high pressure water washing equipment shall be covered as necessary to prevent water intrusion.

7.2.1.7.2 Valve stems and reach rod universal joints located within the tank shall be wrapped to prevent inadvertent coating.

7.2.1.7.3 Tank level indicating equipment mounted internally to the tank shall be removed, stored in a safe location and held for reinstallation.

7.2.1.7.4 All suction, fill and vent lines shall be plugged or blanked to prevent entry of foreign matter into the lines.

7.2.1.7.5 Protective covering shall be inspected at regular intervals, but not less than at the start of each work shift. Degraded protective covering shall be repaired prior to the restart of work. Contamination of the vessel and its equipment shall be reported to the COR verbally, immediately upon its discovery, followed by a written report within four (4) hours of the verbal notification. Clean contaminated equipment and showing that the contamination has not caused damage to same. Cost to repair equipment damaged by such contamination shall be borne by the Contractor.

7.3 Paint / Coating Application;

7.3.1 Upon completion of surface preparation work all dust and dirt generated by this work item shall be removed. All internal tank surfaces shall be blown-down with dry, oil free air at a maximum pressure of 10 psi and/or vacuumed clean.

7.3.2 Apply an MSC approved coating system at 5-6mils DFT per coat listed below;

· 1st Coat, Amercoat 240 Buff 5-6 mils DFT.

· Stripe Coat, Amercoat 240 Red 5-6 mils DFT.

· Final Coat, Amercoat 240 Off-White 5-6 mils DFT.

7.3.3 Thinning of the paint will be allowed for viscosity control ONLY if determined to be necessary by the paint manufacturer's representative. In no case shall the paint be thinned in excess of 5% by volume. Thinner utilized for viscosity control shall be new and of the type recommended by the manufacturer’s product data sheet. RECYCLED SOLVENTS SHALL NOT BE ALLOWED.

7.3.4 Each coat of paint in the system shall be allowed to cure a minimum of 48 hours under the dehumidification conditions set forth in paragraph 7 prior to the start of the successive coat. The final coat of paint shall be allowed to cure for a minimum of seven (7) days with DH in operation before the introduction of any water into the tank.

7.3.5 Paint material shall 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 70o F.

7.3.6 Ensure the following conditions are met prior to painting:

7.3.6.1 Surfaces shall be clean, dry and free of oil, grease or residues from surface preparation.

7.3.6.2 The appearance of the prepared surface shall meet the definition established by the cited surface preparation standard(s).

7.3.6.3 Air and substrate temperatures shall be within the range published by the paint manufacturer.

7.3.6.4 The ambient air and substrate temperatures register at least 50 F. above the dewpoint temperature.

7.3.6.5 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 shall be no higher than 85 percent.

7.3.6.6 Spray equipment, if used, including pot, lines and gun are clean and have been flushed with new solvent of the type recommend by the paint manufacturer’s product data sheet. RECYCLED SOLVENTS SHALL NOT BE ALLOWED.

7.3.6.7 The surface profile is angular in nature and of a depth that meets the manufacturer’s requirements for the coating being applied.

7.3.6.8 Material Safety Data Sheets for the product(s) being applied are on the job site and have been reviewed by the personnel involved.

7.3.6.9 Prior to application of any coating, the area to be painted shall be inspected and approved by the COR and the Paint Representative. Inspection shall include surface preparation including cleanliness, surface profile as determined by replica tape, DFT readings of prior coats, etcetera, as applicable depending upon the current stage of coating application. This inspection includes not only the initial coat of paint, but all subsequent coats as well.

7.4 Mechanical / Fluids;

7.4.1 Upon completion of all coating work all removals shall be reinstalled and proven operationally. All protective covering, plugs and blanks shall be removed. The tank shall be cleaned of all debris and closed-up as original.

7.4.2 Prior to closure, a final inspection of the tank interior shall be conducted by the Paint Rep and MSC Rep.

7.4.3 Disturbed areas on the exterior of the tank, its connected piping or equipment shall be cleaned, primed and coated to match the surrounding area.

7.4.4 Prepare a paint report and submit same to the COR within three (3) days of completing the coating application. The report shall include the following data:

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

7.4.4.2 The ambient and substrate temperature, relative humidity and dewpoint temperature at time of each coating application.

7.4.4.3 Dry film thickness readings at a rate of five (5) spot readings per 1,000 sq. ft. of surface for each coat of paint. DFT gages shall be calibrated and spot readings shall be taken in accordance with SSPC-PA2, Measurement of Dry Coating Thickness With Magnetic Gages.

7.4.4.4 The manufacturer, Product Identification Number and Batch Numbers for each coat of paint applied.

7.4.4.5 Results of testing for non-visible surface contamination (soluble salts).

7.4.5 The square footage of the tank, the paint system to be utilized and provisions for the manufacturer's representative shall be as set forth in the basic specification.

7.4.6 Upon completion the vessel shall be cleaned of all residues resulting from the surface preparation and painting operations.

7.4.7 All debris generated in the performance of this item, whether solid or liquid, shall be disposed of in accordance with applicable Federal, State and Local regulations.

7.4.8 All work shall be inspected and approved by the COR.

7.5 Electronics:

None.

7.6 Inspection / Test:

None.

7.7 Preparation of Drawings/Documentation:

7.7.1 Prepare a paint report and submit same to the COR within three (3) days of completing the coating application. The report shall include the following data:

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

7.7.3 The ambient and substrate temperature, relative humidity and dewpoint temperature at time of each coating application.

7.7.4 Dry film thickness readings at a rate of five (5) spot readings per 1,000 sq. ft. of surface for each coat of paint. DFT gages shall be calibrated and spot readings shall be taken in accordance with SSPC-PA2, Measurement of Dry Coating Thickness With Magnetic Gages.

7.7.5 The manufacturer, Product Identification Number and Batch Numbers for each coat of paint applied.

7.7.6 Results of testing for non-visible surface contamination (soluble salts).

7.8 Manufacturer's Representative:

7.8.1 A Coating technical representative will be in attendance, on the government's account, to observe the surface preparation and coating application and to advise the MSFSC Port Engineer as to the quality and the appropriateness of the contractor's efforts.

8.0 GENERAL REQUIREMENTS: None additional.

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