Closure Instructions that are specific for each manufacturer must accompany containers that are DOT certified. These instructions indicate the process that a filler must follow in order to properly close the container in accordance with the Design Qualification Test for that specific drum type. Torque, dimensional measurements and visual safeguards are a part of each closure technique. However, it is the responsibility of the filler not only to follow these instructions, but also to question a container that does not appear to be properly closed. A drum torqued at more or less than the prescribed foot pounds, a ring gap greater than or less than the specified distance, or gaskets which appear not to be properly seated onto the bead, should be quarantined and the manufacturer should be contacted. Just as the DOT expects each filler to close a drum properly, they also expect the filler to respect safe transportation guidelines and question drums that cannot be correctly secured.
