In NFPA 99, which term best defines a low-pressure, vacuum-insulated vessel containing gases in liquid form?

In NFPA 99, which term best defines a low-pressure, vacuum-insulated vessel containing gases in liquid form?

• A. Cylinder
• B. Container
• C. Appliance
• D. Safety Can

Answer: (B)

In NFPA 99, the term described is container. This category refers to vacuum-insulated vessels that store liquefied gases at low pressure, often called dewars. They’re designed to keep cryogenic liquids like liquid oxygen at very low pressures while minimizing heat in and boil-off. This sets them apart from cylinders, which are small, high‑pressure gas containers; from appliances, which are the equipment used to deliver gas to the patient through the system; and from safety cans, which are portable, smaller containers for transporting limited amounts of gas. So the best fit for a low-pressure, vacuum-insulated vessel containing gases in liquid form is a container.

In NFPA 99, the term described is container. This category refers to vacuum-insulated vessels that store liquefied gases at low pressure, often called dewars. They’re designed to keep cryogenic liquids like liquid oxygen at very low pressures while minimizing heat in and boil-off. This sets them apart from cylinders, which are small, high‑pressure gas containers; from appliances, which are the equipment used to deliver gas to the patient through the system; and from safety cans, which are portable, smaller containers for transporting limited amounts of gas. So the best fit for a low-pressure, vacuum-insulated vessel containing gases in liquid form is a container.