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A review of available codes, standards, and recommended procedures <br /> produces the following consensus: <br /> 1. All possible sources of ignition must be kept from impacting the <br /> tank or the area in which flammable vapors may reside during <br /> excavation or after removal. <br /> 2. Drain and flush all piping into the tank. Flammable or <br /> combustible free standing liquid production stock will be removed <br /> from the tank prior to removal. Avoid spilling product o;i the <br /> ground during disconnection of the tank from its associated <br /> lines. <br /> 3. Vent lines should not be sealed and should be cut last. Keep all <br /> sources of ignition away from vent lines as well as tanks. <br /> 4. Once all liquid has been removed from the tank, any tank with <br /> flammable vapors in excess of 10 percent of the LEL will be <br /> purged with dry ice (CO ) . Fifteen pounds of dry ice per 1 ,000 <br /> gallons of tank capacity is added to render the tank inert. All <br /> piping except the vent pipe should be disconnected. <br />