What compressed gas cylinder does not require a safety relief device?

The option identifying "POISON-A" as a compressed gas cylinder that does not require a safety relief device is based on the specific regulatory and safety considerations related to different types of gases.

Safety relief devices are typically necessary for pressurized gas cylinders containing flammable gases or those that may pose explosive hazards, as they help prevent excessive pressure buildup that can lead to accidents. In the case of non-flammable or inert gases, if they are contained under pressure but do not form flammable or explosive mixtures, they may not require safety relief devices as strictly as other gases do.

"POISON-A" gases, which typically refer to highly toxic materials, are managed under specific federal and state safety regulations that prioritize the prevention of leaks, but they do not necessarily require safety relief devices in the same way that more reactive or flammable gases do. Instead, they are often managed with other safety measures such as pressure relief valves or containment strategies that focus more on exposure hazards rather than explosive risk. This highlights an overall emphasis on the nature of the gas and the relevant safety measures, reflecting the understanding that risk assessments drive safety device requirements.

In comparison, oxygen and flammable liquids are associated with substantial ignition and explosion hazards, thus safety relief devices are mandatory to prevent