| http://www.w3.org/ns/prov#value | - 8.1 Used Containers No welding, cutting, or other hot work may be performed on used drums, barrels, tanks or other containers until they have been cleaned so thoroughly as to make absolutely certain that there are no flammable materials present or any substances such as greases, tars, acids, or other materials that when subjected to heat, might produce flammable or toxic vapors.
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