A permit is required when outside storage of flammable cryogens exceeds what volume?

The volume threshold for requiring a permit for outside storage of flammable cryogens is set at 60 gallons. This standard is established to ensure safety and compliance with fire codes, as the storage of large quantities of flammable cryogens poses significant risks, including flammability and the potential for explosive atmospheres.

When the volume exceeds this amount, additional safety measures and regulatory oversight become necessary to mitigate hazards related to fire and explosion. These measures could include proper containment strategies, signage, and adherence to specific distance requirements from occupied buildings or public areas. The regulation aims to minimize risks to both personnel and property in the vicinity of storage sites.