Carbon dioxide portable tanks

Nitrous oxide is contained and transported in its liquid phase in high-pressure gas cylinders or in liquid cylinders. It is transported as a liquefied compressed gas under high pressure in cylinders and at lower pressures and reduced temperatures in refrigerated cargo tanks and insulated portable tanks. Nitrous oxide is stored in a foam-insulated tank accompanied by a refrigeration unit, which is similar to the tank used for carbon dioxide. 

Liquefied carbon dioxide is shipped in uninsulated cylinders, insulated portable tanks, insulated cargo tanks, and insulated tank cars. In high-pressure supply systems, it may be stored and used from single or manifolded uninsulated cylinders. In low-pressure systems, it is stored in insulated pressure vessels with controlled refrigeration systems and auxiliary heating when required. 

Liquefied carbon dioxide is also authorized for shipment in portable tanks conforming to specification DOT 51. The minimum design pressure is the same as for cargo tanks. 

G-6.4 Safe Transfer of Low Pressure Liquefied Carbon Dioxide in Cargo Tanks, Tank Cars, and Portable Containers. A guide for employees, safety and training personnel, and others involved in transferring liquid carbon dioxide (17 pages). 

The kind and number of extinguishers needed for particular types of fires are specified in NFPA 10, Portable Fire Extinguishers. The most common types of extinguishers in use are the pressurized water, carbon dioxide, and multipurpose dry chemical. Other extinguishers commonly used are water pump tanks, halon 1211, and combustible-metal-type dry powder. 

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