What is the minimum distance that must be maintained between the relief valve on a DOT container and a building opening beneath the level of the relief valve discharge?

The correct answer is based on safety regulations pertaining to the placement of relief valves on Department of Transportation (DOT) containers, which are designed to prevent the dangerous build-up of pressure within the container. The relief valve serves as a critical safety feature, discharging gas safely away from the container when pressure exceeds a specified limit.

Maintaining a minimum distance of 3 feet between the relief valve discharge and any building opening beneath it is essential to ensure that any escaping gas does not enter the building through windows, doors, or other openings, potentially creating a fire or explosion hazard. This distance is pivotal in reducing risks associated with the release of LP gas, which is heavier than air and can accumulate in low areas or confined spaces.

The importance of this regulation is underscored by the need for safety in residential and commercial areas. Adhering to the 3-foot standard helps to mitigate the dangers posed by LP gas leaks, thereby protecting both personnel and property in the vicinity.