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8. Galvanized items, unless scheduled to be coated <br />D. Schedule Of Items Not Requiring Coating: <br />1. Brass, bronze, copper, plastic, rubber, stainless steel, chrome, or lead. <br />2. Buried or encased piping or conduit. <br />3. Grease fittings. <br />4. Steel to be encased in concrete or masonry. <br />5. Nameplates. <br />6. Serial number tags. <br />7. Control Panels. <br />8. Instruments. <br />3.03. SURFACE PREPARATION OF STEEL <br />A. Fabrication Defects: <br />1. Correct steel and fabrication defects revealed by surface preparation. <br />2. Remove weld spatter and slag. <br />3. All welds shall be ground to a smooth contour. <br />4. Smooth weld undercuts and recesses. <br />5. Grind down porous welds to pinhole -free metal. <br />6. Remove weld flux from surface. <br />7. Grind sharp edges to approximately 1/8 inch radius. <br />B. Protect installed equipment, mechanical drives, and adjacent coated equipment <br />from abrasive blasting to prevent damage caused by entering sand or dust. <br />C. Ferrous Metal Surfaces: <br />1. Remove grease and oil in accordance with SSPC SP-1. <br />2. Remove rust, scale, and welding slag and spatter, and prepare surfaces <br />as directed below. <br />3. Feather edges of existing coating, at spot blasted areas, using SSPC-SP <br />3 Power Tool Cleaning methods. <br />4. Coat surfaces within 8 hours of abrasive blasting. <br />5. When abrasive blasted surfaces rust or discolor before coating, abrasive <br />blast surfaces again to remove rust and discoloration. <br />6. Do not coat surfaces before abrasive blasting. <br />7. When metal surfaces are exposed because of coating damage, abrasive <br />blast surfaces before touching -up. <br />D. Interior Pressure Vessel and Backwash Tank Surfaces: Remove visible oil, <br />grease and other surface contaminants in accordance with SSPC-SP 1 Solvent <br />cleaning. Remove dirt, dust, mill scale, rust, paint, oxides, corrosion products, <br />and other foreign matter in accordance with NACE 2/SSPC-SP 10 Near White <br />Metal Blast with a sharp angular profile of 2.0 - 3.5 mils or as recommended by <br />the coating manufacturer. <br />E. Exterior Pressure Vessel and Backwash Tank Surfaces: Remove visible oil, <br />grease and other surface contaminants in accordance with SSPC-SP 1 Solvent <br />cleaning. Remove dirt, dust, mill scale, rust paint, oxides, corrosion products, <br />and other foreign matter in accordance with NACE 2/SSPC-SP 10 Near White <br />Metal Blast with a sharp angular profile of 2.0 - 3.5 mils or as recommended by <br />the coating manufacturer. <br />P05367-2016-000 / Mounds View 09 96 20 - 9 PRESSURE VESSEL COATING <br />2019 WTP Rehabilitation SYSTEMS <br />