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0 0 <br /> vapors, which are heavier than air, are being readings shall be performed just prior to the <br /> removed from the bottom of the tank. If an inspection procedures. <br /> eductor-type air mover is being used, an <br /> extension, such as a drop tube, shall be used to A10.2 Interior visual inspection of the tank wall <br /> draw air/vapors from the bottom of the tank. If shall be performed to determine if the tank is <br /> ventilation is insufficient or not maintained, it suitable for lining(see A10.4). <br /> shall be recognized that flammable vapors may <br /> accumulate within the tank. <br /> A10.3 BALLPEEN HAMMER TEST <br /> A93.2 For final cleaning, the entire internal A10.3.1 To determine if perforations exist, a <br /> steel tank surface shall be abrasive blasted to a brass ballpeen hammer may be used before <br /> white metal finish completely free of scale, rust, abrasive blasting to establish the size and <br /> and foreign matter in accordance with SSPC SP approximate number of the perforation(s). <br /> 5-63 (S.S.S.0,White Metal Blast cleaning). <br /> A10.3.2 Prior to abrasive blasting, the brass <br /> A9.3.2 Abrasive blast operators shall wear ballpeen hammer test may be used to open up <br /> approved helmets connected to sources of clean rust plugs into perforations as a preliminary <br /> air. Bonding shall be provided between the inspection to determine if the tank will meet the <br /> blasting nozzle and the work surface or the qualification criteria of section A 10.4. <br /> blasting nozzle shall be effectively grounded to <br /> another source which provides equivalent <br /> protection from static charges. A10.3.3 After abrasive blasting and when <br /> perforations are present, the brass ballpeen <br /> hammer test shall be used to tap the interior of <br /> the tank shell to sound for thin areas around <br /> A9.3.3 Separators and traps shall be used to perforations. Ballpeen hammer testing shall be <br /> remove oil and water from the compressed air accomplished substantially in accordance with <br /> utilized to operate blasting equipment. API Guide for the Inspection of Refining <br /> Equipment, Chapter IV, Inspection Tools. Two <br /> A9.3.4 Following completion of the abrasive hammer commonly used in hammering <br /> blasting operation, the surface shall be inspections are illustrated in Figures 4A and 4B. <br /> vacuumed or cleaned with a fine broom or <br /> brush. <br /> A10.3.4 Tanks that are free from perforations <br /> A10.0 TANK INSPECTIONS and do not require repair shall be qualified <br /> suitable for a minimum 10 year life extension by <br /> A10.1 PRECAUTIONS lining. <br /> 10.1.1 Ventilation shall be maintained A10.4 REPAIRS ALLOWED& <br /> throughout the inspection procedures. Vapor STRUCTURAL ASSESSMENT <br /> 17 <br />