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MISC#4\FILES\9750SPEC Page 3 of 22 <br /> 2 . Drain all product lines. <br /> For pressure (STP) system gravity drain into tank by <br /> opening check valve at STP and the test port in shear <br /> valve. Disconnect line at STP union to drain/flush <br /> remaining product into an appropriate container. <br /> For suction pump system, disconnect from tank (low <br /> point) and gravity drain into appropriate container. <br /> 44 <br /> CAUTION: DO NOT INTRODUCE COMPRESSED AIR INTO LINES <br /> FOR PURPOSE OF EVACUATING PRODUCT FROM LINES. <br /> 3 . Remove all flammable liquid from tank bottoms by using a <br /> hand pump to evacuate the remaining few inches. Dispose <br /> of tank bottom liquid remains per applicable <br /> regulations. <br /> 4 . Dig down to top of tank and remove fill (drop tube) , STP <br /> and all piping connections to the tank. <br /> 5. Temporarily plug all tank openings, complete excavation <br /> and remove the tank; placing it in a secure location. <br /> Block the tank to prevent movement. USE EXTREME CAUTION <br /> DURING REMOVAL OPERATION. <br /> 6. Remove flammable vapors. <br /> Preferred method for conditioning tank. <br /> Make vapors inert by adding 15 pounds of dry ice (carbon <br /> dioxide) per 1000 gallons of tank capacity. <br /> The vapors in the tank may be made inert by adding solid <br /> carbon dioxide (dry ice) in the amount of 15 pounds per <br /> 1000 gallons of tank capacity. The dry ice should be <br /> crushed and distributed evenly over the greatest possible <br /> area to secure rapid evaporation. Avoid skin contact <br /> with dry ice because it may produce burns. As the dry <br /> ice vaporizes, flammable vapors will flow out of the tank <br /> and may surround the area. Hence, observe all normal <br /> safety precautions regarding flammable vapors. Make sure <br /> that all of the dry ice has vaporized. <br /> 7 . After the tank has been freed of vapors and prior to <br /> moving from the site, plug or cap all holes. Use <br /> threaded (boiler) plugs to plug any corrosion leak holes. <br /> One tank fitting plug should have a 1/8-inch vent hole to <br /> prevent the tank from being subjected to an excessive <br /> pressure differential caused by extreme temperature <br /> changes. <br />