Helium portable containers

Liquid helium is shipped and stored in small, insulated portable containers, which hold quantities ranging from 1 gal to 132 gal (3.8 L to 500... 

Most of the cryogenic fluids are now available commercially in many parts of the world. These are shipped and stored in special insulated containers from which they are either used directly or are transferred to portable dewars and used as required. However, liquid helium and some of the reactive fluids are ordinarily produced in laboratory liquefiers as they are needed. For simplicity, laboratory experiments may be conducted with these fluids directly in the liquefier storage vessel, although provisions are usually made for the withdrawal of the liquid through an evacuated transfer tube. 

CONTAINER. The basis of the cryostat, which is shown in Fig. 1, is a standard commercial stainless steel dewar vessel 16 in. high and 5 in. OD (A). These cans are sturdy units, readily available, and their small size contributes greatly to the portability of the completed cryostat as well as to the low consumption of liquid hydrogen and helium. The single dewar is used in preference to the double dewar arrangement often employed with liquid helium in order to escape complexity and the associated vacuum problems. The sacrifice in thermal performance is more than adequately compensated by convenience and simplicity. 

Helium gas is authorized for shipment in cylinders, tank cars, and tube trailers in accordance with DOT and TC regulations [5, 6]. Liquid helium is shipped as a cryogenic fluid in insulated cylinders, insulated portable and cargo tanks, and insulated intermodal containers. 

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