3394Galvanized Structural Shapes

3394.1SCOPE

Provide galvanized structural shapes, plates, bars, and castings for pipes and S tructures.

3394.2REQUIREMENTS

Blast clean all items in accordance with SSPC-SP6/NACE No. 3, “Commercial Blast Cleaning,” before galvanizing. Exceptions to this blast cleaning requirement are listed in 2471.3L.1, “Galvanizing.” Provide structural shapes, plates, bars, and castings galvanized meeting the requirements of ASTM A123, Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products. Provide castings that have been pickled before galvanizing. For galvanized surfaces that have handling marks or minor chips that are no greater than 1/2 inch at the narrowest dimension, repair in accordance with ASTM A780, Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings, Annex 1 or Annex 2 (brush applied paint only). Ensure the dry film thickness (DFT) of the coating repair is in accordance with ASTM A123, Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products. Perform repairs in accordance with the supplier’s quality procedures. Obtain an approved non- conformance report (NCR) for each repair. Calibrate dry film thickness gauges in accordance with SSPC-PA 2, “Measurement of Dry Coating Thickness with Magnetic Gauges.” The galvanizer shall provide the Engineer with all galvanizing process-related Quality Control documents which demonstrate compliance to this Specification and referenced Specifications prior to shipment of the galvanized product. Identify in a Purchase Order(s) which specific items are to be duplex coated and which Materials to be galvanized are reactive (e.g. 3309, “High-Strength Low-Alloy Structural Steel,” etc.). Submit an NCR to the Engineer before performing any repairs. It is the Galvanizer's responsibility to notify the Bridge Engineer at least 5 Working Days of intent to galvanize. See 2452.3H.2, “Galvanized Piles,” for hot-dipped galvanized (HDG) pile repair. A Additional Galvanizing Requirements for Duplex Coated Material All products supplied using this Specification have higher aesthetic expectations than standard galvanized products. Produce the final product to comply with its intended use as “architectural” with heightened aesthetics and/or visual qualities. Process all metal component(s) to be galvanized utilizing a “dry” kettle. Preflux the Material prior to the galvanizing bath using an aqueous tank of zinc chloride/ammonium chloride . Do not use a “top flux” blanket on the molten zinc bath. Air cool the Materials to ambient temperature before handling for shipment and/or storage . Do not quench the Material or apply any post-galvanizing treatments.

Lumps, projections, globules, high spots, drip lines, heavy deposits, blisters, black and bare areas, flux deposits, thin spots, dross inclusions, etc., are considered unacceptable . Repair unacceptable zinc coatings in accordance with the galvanizer’s approved Quality Manual and the coating applicator’s approved method. Zinc, which will interfere with the “intended use of the product,” will not be permitted. Store galvanized metal component(s) in a manner that will prevent the formation of “ white-rust” or wet storage staining. “White rust” or staining of the galvanize coating is not acceptable.

3394.3SAMPLING AND TESTING — BLANK