483Coal Tar Epoxy Coating

483.01 Description

Furnish and apply a protective coal tar epoxy coating system to the existing steel in the areas specified in the Contract Documents.

483.02 Materials

The coal tar epoxy coating shall be a VOC compliant, self-curing two component system consisting of resin and the catalyst and shall meet the Corps of Engineers Formula C-200 or SSPC-Paint No. 16. The material shall be processed and packaged in a manner that ensures within a period of one year from date of manufacture, that it will not gel, liver or thicken deleteriously, or form gas in the closed container. Coatings and vehicles shall be packaged in standard containers not larger than 5 gal with removable friction or lug type covers. Each container of separately packaged component shall be clearly and durably labeled to indicate the purchaser’s order number, date of manufacture, manufacturer’s batch number, quantity, color, component identification, material safety data sheet (MSDS), and the designated name and formula or specification number of the coating together with special instructions.

483.03 Construction

Refer to Section 436 - Cleaning and Painting Structural Steel.

483.03.01 Surface Preparation. Clean all surfaces to be coated as specified in 436.03.10(a),

436.03 10(b), and 436.03.10(h) except clean surfaces within 6 in. of the mean low waterline to

bare metal having a minimum surface profile height of 1 mil. Ensure that all surfaces to be coated are completely dry, free of moisture, soil, dust, grit, etc., at the time the coating is applied. Remove any traces of oil, grease, or other organic matter prior to coating by using solvent, spot blasting, or as directed by the Engineer. Any additional surface preparation, temperature and humidity ranges, and application methods shall be as recommended by the manufacturer and approved by the Engineer.

483.03.02 Mixing. Perform all mixing in accordance with the manufacturer’s specifications and

by use of mechanical mixers. Only full containers of components A and B packaged by the manufacturer shall be used for mixing, as measuring portions for smaller or larger batches is 483 — COAL TAR EPOXY COATING 2026 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS prohibited. Full containers shall include scraping the inside of the container unless otherwise specified by the manufacturer.

483.03.03 Application. Apply the coal tar epoxy by spray using a heavy-duty spray gun or airless

spray equipment having at least a 28:1 pump ratio. Apply the coal tar epoxy in two coats in accordance with the manufacturer’s recommendations to provide a minimum dry film thickness (DFT) of 20 mils on the finished surface. Whenever conditions warrant special procedures or surface preparations as recommended by the manufacturer, perform them prior to application of the coal tar epoxy. Ensure that the temperature of the coating and the steel at the time of application of the coating is within the manufacturer’s tolerances. Whenever possible apply the coating without thinning. When thinning is required, use the thinner recommended by and at the rate specified by the manufacturer. When thinner is used, it may be necessary to apply three coats in lieu of two to provide the specified dry film thickness. Ensure that the finished coating is generally smooth, glossy, and free of sharp protuberances. Sags, dimpling, and curtaining will be permitted up to a maximum of 3 percent of the surface. Cut off sharp protuberances using a sharp wood chisel, grinding, or other means acceptable to the Engineer. Smooth the surface of the areas from which material has been removed by recoating.

483.03.04 Inspection. Notify the Engineer when the coating operations are completed and ready

for inspection. Inspection of the completed work will be by magnetic detector or low voltage detector readings and by visual inspection for pinholes and holidays. Touch up areas designated as being inadequately coated in accordance with the coating manufacturer’s recommendations. When five or more deficiencies are found in a 100 ft2 area, the Engineer may require recoating of the entire area in which they occur. Provide the holiday detector for inspection.

483.03.05 Safety. Whenever spraying the coating in enclosed spaces, provide an adequate

ventilation system except as specified herein. The system shall be capable of positively exchanging the air in the enclosed space for fresh air at the rate of not less than 5000 ft3 per minute for each spray gun in operation, and all parts of the space shall be swept by moving air. Operate the ventilating system during the entire application period and continue after spraying has halted until the applied film is no longer giving off appreciable solvent vapors. The air in the enclosure shall always be safe from fire and explosion hazards as determined by a commercially available explosion meter approved by the Engineer. All respirators used for this type of work shall at a minimum meet OSHA Standards, Regulations, and the manufacturer’s MSDS. 483 — COAL TAR EPOXY COATING 2026 STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS

483.04 Measurement and Payment

Cleaning the designated areas and coating with coal tar epoxy will not be measured but the cost will be incidental to the pertinent Cleaning and Painting item specified in the Contract Documents. Payment will be full compensation for furnishing and applying the coal tar epoxy, surface preparation, and for all material, labor, equipment, tools, and incidentals necessary to complete the work.