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20.03 PREPARATION OF SURFACES TO BE PAINTED. <br />Clean all surfaces to be painted. Before starting mechanical cleaning, remove all oil and <br />grease with mineral spirits or other low toxicity solvents with a flash point over 100 <br />degrees Fahrenheit or use detergent, steam jenny or caustic wash and rinse. Use clean <br />solvent rags so as not to redistribute oil on the surface. Do not leave oily residue on <br />surfaces to be painted. Schedule cleaning and painting so that dust and other <br />contaminants from cleaning operations do not fall on wet, newly painted surfaces. <br />1. Metal: Remove all oil and grease with approved solvents from the metal surface <br />prior to blast cleaning. Grind all rough edges, weld seams and sharp corners to a <br />smooth finish - do not polish surfaces. rof le of he blasted steel shall be between <br />sandblasting as described below. The p <br />25%-33°/a in mils of the final dry mil thickness of the paint coating to be applied. <br />This profile may be checked by any means available. <br />A. Steel and iron (immersed or buried): Near-white (or better) blast cleaning as <br />outlined in surface preparation Specification SSPC SP-10. This is a part of this <br />document as Technical Specification No. 3. <br />B. Steel and iron (non-immersed or exposed): Commercial (or better) blast <br />cleaning as outlined in surface preparation Specification SSPC SP-6. This is a <br />part of this document as Technical Specification No. 2. <br />2. Blast Cleaning: Provide moisture separators to remove all oil and free moisture <br />from the air supply; nozzles, hoses, compressor and transformer must be free of oil <br />and water. Surface to be painted shall be clean, dry and ready to receive primer or <br />coating. <br />Dry blasted areas must be free of loose sand, dust and dirt by blowing clean with <br />clean air or by vacuuming. <br />Protect machinery and other equipment in vicinity of sandblast work, schedule <br />"clean/paint" operations to avoid settling of dust and grit on newly painted <br />surfaces. <br />Do not blast any more surface than can be coated the same day. Apply paint <br />immediately after blast cleaning. Do not coat any surfaces which show any signs <br />of formation of moisture or oxidation (rust). <br />TS20-3 <br />