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Cryogenic dewars are used for low pressure transport and storage of liquid nitrogen, helium and oxygen as well as biological samples or superconductive magnets.
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The operational concept of the cryogenic dewars is very similar to that of the vacuum bottles, with an inner and outer shell in between which the vacuum provides the thermal insulation. The SAES NEGs are used to maintain pressures of around 10-5 to 10-4 Torr in the evacuated jacket of the dewar.
SAES Getters has developed a couple of tailor made and cost effective solutions for this specific application, which requires bulk quantity of material because of the large volume of the vacuum chamber. The St 2002 Pieces are used in the cryogenic dewars that are not intended for liquid oxygen service.
For liquid oxygen transportation and storage a new getter material, Lothar, has been specifically developed to remove hydrogen for the evacuated jacket of cryogenic dewars. |
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