0912_A_UNDERWATER_HULL_CLEANING_and_PAINTING_REV_1_.docx

USNS ARCTIC

(T-AOE 8)

DRYDOCKING AND UNDOCKING N32205-19-R-6012

18 JULY 2013

ITEM NO. 912 CATEGORY “A” N756/CSI/JB

UNDERWATER HULL CLEANING AND PAINTING REV 1

1.0 ABSTRACT:

1.1 This work item describes the preservation requirements to the ship’s underwater hull.

2.0 REFERENCES:

2.1 NAVSEA Drawing No. 603-6360521, Draft, Boot-topping and Ship's Name.

2.2 NAVSEA Drawing No. 500-6362745, Scupper Lips and Split Pipe Extensions.

2.3 MSFSC Standard Work Item No. 013, Underwater Hull Maintenance Preservation.

2.4 Steel Structures Painting Council, Good Painting Practice, Volume 1, Fourth Edition. (Contractor Held)

2.5 Steel Structures Painting Council, Systems and Specifications, Volume 2, Eighth Edition. (Contractor Held)

3.0 ITEM LOCATION/DESCRIPTION:

3.1 Location: Ship's entire underwater hull from the keel to the top of the boot-topping (approximately the 40'-8" waterline) and including the rudder, rudder stock, stern frame transom, fairwaters, skeg, bilge keels, struts and strut housings, sea chests, strainer plates, access plates/covers, rope guards, exposed shaft sections, and attached appendages.

3.2 Quantity: Approximately 125,000 square feet underwater hull, which includes approximately 23,600 square feet of boot-topping area.

4.0 GOVERNMENT FURNISHED EQUIPMENT/MATERIAL/SERVICES:

4.1 Government Furnished Material(GFM):

4.2 Government Furnished Service (GFS):

4.2.1 Government Paint Representative

5.0 NOTES:

5.1 The contractor and all subcontractors, regardless of tier, must consult the General Technical Requirements 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 and 21 through 29.

5.2 The contractor and all subcontractors, regardless of tier, are advised to review the other Work Items under this contract to determine their effect on the work required under this Work Item. Many of the definitions relating to the performance of this Work Item are found in Work Item 001.

5.3 Solvents are provided for viscosity control only, not for equipment clean up.

5.4 The contractor is responsible for all costs associated with monitoring, containment, handling, collection, processing, clean up, recycling and disposing of wash water, rinse water, and dissolved solvents used and generated during work accomplished by this work item, whether on the ship, on the pier adjacent to the ship, or in the dry-dock basin. ALL LABOR AND MATERIAL COSTS ASSOCIATED WITH THIS LEVEL OF EFFORT, WHERE REQUIRED OR FOUND NECESSARY, SHALL BE INCLUDED IN THE BID PRICE OF THIS WORK ITEM.

5.5 IF Contractor uses a grit blast method to accomplish work item requirements, then ALL LABOR AND MATERIAL COSTS associated with the level of effort required in monitoring, containment, handling, clean up, processing, temporary storage, recycling, transportation, and disposal, of the spent blast grit generated; SHALL BE INCLUDED IN THE BID PRICE OF THIS WORK ITEM.

6.0 QUALITY ASSURANCE REQUIREMENTS:

6.1 MSC reserves the right to perform additional tests or inspections as required to ensure compliance with this Work Item including, but not limited to, Blotter Test, Vial Test, pH Test, Non-Visual Surface Contaminant Tests, Adhesion Tests and Sieve Tests.

7.0 STATEMENT OF WORK REQUIRED:

7.1 Accomplish the requirements of Reference 2.3. In addition to the requirements of Reference 2.3, accomplish the requirements specified below:

7.2 Freshwater wash with a minimum of 3000 PSIG the ship's underwater hull in its entirety immediately upon dry-docking of vessel to remove all salt water contamination and to remove defective coatings and fouling. Degrease the underwater hull exterior with suitable solvents prior to blasting. Wash down and dispose of solvents used. Monitor, contain, collect, process, filter, clean up, recycle, and dispose of all wash water, rinse water, and degreaser rinse fluids, generated by this work item. Dispose as found necessary or required, in accordance with any/all current local, county, state, or Federal Regulations.

7.2.1 Upon completion of all water washing chloride testing shall be performed on random areas 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.

7.3 Accomplish the following prior to starting blasting evolutions:

7.3.1 Record, document, and mark load lines and boot-topping marking prior to blasting.

7.3.2 Document and record location of sea chest zincs. Cover and protect zincs from damage. DO NOT PAINT OVER ZINCS. Inspect zinc and submit condition report to MSCREP.

7.3.3 In the event that the contractor elects to perform this work item using ultra high pressure water jetting in lieu of abrasive blasting, water jetting shall be performed in accordance with SSPC-SP-WJ2 surface preparation and cleaning of steel and other hard materials by high and ultrahigh pressure water jetting prior to recoating. Blasted areas shall be prepared to a WJ-2, SC-2 condition. No more than light flash rust shall be allowed on the steel at the time of coating application. If heavier flash rust is present, the surface shall be pressure washed with a minimum of 3,000 psi and allowed to dry to restore the surface to a coatable condition.

a. Contractor is to identify, during the proposal stage, the type of surface preparation elected in order for the government to provide the appropriate coating materials in a timely manner. The gfm paint system identified in 4.0 is for a surface preparation to SSPC-SP-10 near white metal (abrasive blast).

7.4 All surfaces of strainer plates are to be blasted and coated as specified for the ship's underwater hull.

7.4.1 All sea suction lines and overboard lines are to be hard blanked on the ship's internal mechanical joint and all interior surfaces of all sea chests are to be blasted and coated as specified for the ship's underwater hull.

7.4.2 Upon completion of hull coating, reinstall all strainer plates with new Monel fasteners.

7.5 Grit and/or other abrasives used for blasting are to be shielded from rain by suitable shelters.

7.6 Protect all openings and transducers for depth finders and anodes with plywood.

7.7 Temporarily install a plywood cover to protect the propellers during all blasting and painting operations.

7.8 Temporarily install chutes plugs internal blanking, etc to prevent discharges from the ship touching surfaces to be coated.

7.9 Heavily scaled surfaces are to be scaled by pneumatic tools and/or hammers prior to abrasive blasting.

7.10 Sweep Blast (Sandsweep – WJ4) the entire underwater hull and boot-topping identified in 3.0.

7.10.1 The surfaces shall be blasted to remove existing antifouling only and leave solidly adhering anti corrosive coatings.

7.10.2 General grit or slag (salt and sulfur free) is to be applied through nozzles operating at a minimum air pressure of 90 psi at the nozzle.

7.10.3 After blasting, hull surface areas shall have an even gray-white color as defined by Reference 2.5. All surface areas shall be free of mill scale, rust, grease, paint and other foreign matter.

7.11 CHECKPOINT: Conduct a drydock inspection of the underwater hull paint system to identify areas that will require blasting to bare metal. When all areas have been identified, the contractor shall determine the total square footage and submit a condition report to the government. The paint inspection shall be attended by the MSCREP and Government Paint Representative.

7.12 Perform an SSPC-SP-10; Blast to Near White Metal to the forty thousand square feet of the areas identified in the dry dock inspection of the underwater hull paint system(para 7.11).

1. Prior to the start of abrasive blasting the blast media shall be tested to ensure that it is not contaminated with chlorides, as determined by field or laboratory analysis using reliable, reproducible test equipment. Submit a report listing the results of the testing.

1. Upon completion of exterior surface preparation and approval of MSCREP, apply the following AC coating system to accepted areas, in accordance with the manufacturer's instructions and MSCREP:

PPG Paint System

1. Upon acceptance of AC Coating by MSCREP apply Anti Foulants (AF) to approved areas in accordance with the manufacturer's instructions and MSCREP:

PPG Paint System

* AC Tie coat prior to application of the AF System

1. AF colors are to be alternated by coat for hull below the LLL. Boot-top shall be painted with Black AF each coat.

1. Time for curing paints and times between coats as well as minimum and maximum time for undocking is to be as recommended by the paint manufacturer's representative.

1. No painting is to be done from Sunset to 0800 (8:00 AM) the following morning without prior approval from the MSCREP.

1. All areas to be coated are to be blown down with dry, oil free air prior to painting.

1. No painting shall take place without the government paint representative in attendance.

1. Paint is not to be applied to hull surfaces when the surface temperature is below 40 degrees Fehrenheit, when the humidity is above that recommended by the paint manufacturer or as otherwise limited by the paint manufacturer's recommendations, unless prior permission is obtained from MSCREP in writing.

1. Application of all products is to be by airless spray.

1. Mil thickness is to be measured dry with a dry film thickness indicator. Dry film thickness measurements are to be taken at a minimum of 5 locations for each 1,000 square feet of surface area and recorded on the contractor test and inspection records.

1. Draft marks from the keel to the top most draft mark are to be painted in after all hull painting has been completed. Draft marks, frame numbers and Plimsoll Marks, etc. are to be painted with the following:

PPG Paint System

7.13 Inspect sea chests and overboard discharges in the presence of MSCREP for removal of all plugs and blanks before any sea chest strainer plates are reinstalled.

7.13.1 Chase all SEACHEST grate threads prior to grate installation.

7.14 Remove protection used for transducers, anodes, etc.

7.15 Clean all areas, spaces and machinery of ship contaminated by sandblasting grit and dust to the satisfaction of MSCREP.

7.16 Remove all chutes, plugs and internal blanks used to prevent ship's discharges from touching hull.

7.17 Remove all sheeting, tape and covers.

7.18 Upon completion of blasting and painting and after appropriate curing time has been allowed, wash down decks with fresh water to remove residue caused by this work item.

7.19 Apply one additional finish coat of paint to damaged areas prior to the ship's departure and upon completion of all industrial work.

7.20 Inspection/Test:

7.20.1 An inspection team composed of the MSCREP, Government Paint Representative and the Contractor will be present throughout the entire period of preparing the surface prior to coating applications. The inspection team will inspect the quality of surface preparation achieved. No paint is to be applied until surfaces have been approved by the MSCREP. Suitable protective clothing and approved type masks are to be provided to the inspection team by the Contractor.

7.21 Preparation of Drawings: None Additional

7.22 Manufacturer’s Rep:

7.22.1 Government Paint Representative

8.0 GENERAL REQUIREMENTS: None Additional

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