A flat board laid over the top of an open drum or funnel. When using open top drums, this can be accomplished by clamping or tightly bolting the band that seals the lid to the container. On closed top drums, closing can be accomplished by tightening the bungs securely. Alternatively, and only when the drum is chained or secured as discussed below, the lid may be placed on top without the ring in place as long as there is complete contact with the rim all the way around the top, minimizing the release of vapors. In this situation, the lid must be secured at the end of the work shift.
Many operations require frequent additions of wastes to the container.
A number of commercially available devices may be acceptable for closing the container if the devices are properly used and maintained. The generator must decide what equipment is proper for a specific application by balancing concerns for human safety and environmental protection, always issues of primary importance, against the necessities of production. Spill and splash control equipment can be used to keep the generator in compliance with the regulations and cut production costs due to loss of product or down time for spill remediation. Funnels can be secured to a drum lid by screwing the funnel into the large bung hole on a closed head drum. In order for a container with a funnel to be considered closed, a lid or flap should be attached to the funnel.