What is the minimum legal distance required between the relief valve on an ASME container of 125 water gallons or less capacity and a building opening below the level of the relief valve discharge?

The correct answer reflects the regulations for the safe placement of relief valves on ASME containers. Specifically, the minimum legal distance of 5 feet between the relief valve discharge and a building opening below that discharge level is established to mitigate the risk of potential exposure to propane in case of a discharge event.

This distance ensures that if the relief valve were to activate, any released gas would not accumulate near building openings, which could pose risks such as explosive atmospheres or inhalation hazards for individuals within the building. Adequate spacing helps enhance safety by allowing for the dissipation of gas into the atmosphere rather than allowing it to enter a confined space where ventilation might be limited.

Understanding this safety standard is crucial for anyone working with propane systems, as it not only ensures regulatory compliance but also promotes safety for both personnel and local residents.