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The next step is determined by how the tanks are going to be transported <br /> from the site. <br /> Disposal of tanks. Transport nonhazardous- <br /> With continuous monitoring of the site for any combustible vapors, <br /> ensuring they are below 20% of the Lower Explosive Level (LEL). <br /> Drain product lines into the tank, disconnect lines, cap connection <br /> fittings and remove lines for disposal. Leave vent piping in place. <br /> Triple rinse the tank and piping, and remove rinsate. <br /> Disposal of tanks, Transport Hazardous - <br /> With continuous monitoring of the site for any combustible vapors, <br /> ensuring they are below 20% of the Lower Explosive Level(LEL). <br /> Drain product lines into the tank, disconnect lines, cap connection <br /> fittings and remove lines for disposal. Leave vent piping in place. <br /> Purging and Inertine <br /> Remove flammable vapors by purging or inerting. <br /> Purging is the replacement of explosive vapors with air. Use <br /> eductor-type air mover driven by compressed air. <br /> Inerting is the controlling the oxygen and flammable.vapors in the tank <br /> by displacing it with COZ using dry ice. <br /> Use a minimum of 1.5 pounds of dry ice per 100 gallons of tank capacity, <br /> distributing the ice as evenly as possible over the bottom of the tank. Plug <br /> all openings after adding dry ice, except the tank vent line to allow vapors <br /> to escape. <br /> For either method, vent all vapors a minimum 12 ft. above grade. Monitor <br /> tank with combustible gas indicator until tank atmosphere is less than 20% <br /> of the LEL (Lower Explosive Limit), and less than 10% oxygen. <br /> When the tank has been inerted, remove the vent line, leaving a 1/4" vent <br /> hole for vapor expansion. <br />