Cryogenic Containers Subject

Section 4.2 consolidates the requirements for on-site transport of specific materials, including compressed gas cylinders, cryogenic liquid containers, and acetylene cylinders. This section covers such subjects as cylinder construction, labeling/marking, securing and lifting, and protection caps. 

Cryogenic liquids must be stored, shipped, and handled in containers that are designed for the pressures and temperatures to which they may be subjected. Materials that are pliable under normal conditions can become brittle at low temperatures. Dewar flasks, which are used for relatively small amounts of material, should have a dust cap over the outlet to prevent atmospheric moisture from condensing and plugging the neck of the tube. Special cylinders insulated and vacuum-jacketed with pressure-relief valves and rupture devices to protect the cylinder from pressure buildup are available in capacities of 100 to 200 liters (L). 

Compressed gases and cryogenic liquids in containers pose certain potential hazards when being transported. Containers can leak or be damaged in transport. Hazards can be created from the containers themselves when subject to impact from a vehicle accident, when the container is not properly secured in a vehicle, or when the product being transported is released from its container exposing people or the environment to the hazardous materials. 

Since compressed gases and cryogenic liquids are defined as hazardous materials by DOT and TC regulations, the transportation of these products by the gas manufacturers and suppliers is subject to considerable safety-related regulations. Unfortunately many of the more serious incidents leading to injury or fatality have occurred from transporting containers in unsuitable vehicles and in a hazardous manner. 

AV-8 Characteristics and Safe Handling of Cryogenic Liquid and Gaseous Oxygen, Subjects covered include characteristics, uses, containers, transfer systems and procedures, safe handling. 

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