METHOD OF MAINTAINING VACUUM IN HEAT-INSULATED CHAMBER OF DOUBLE- PIPE LINE Russian patent published in 1995 - IPC

FIELD: transfer of cryogenic fluids (oxygen, hydrogen, nitrogen and the like) from storage reservoirs to using systems via pipe lines, as well as in heat-power engineering. SUBSTANCE: heat- insulated chamber of pipe line is brought in communication with tight volume during evacuation phase by means of automatic valve; non-condensed residual hydrogen liberating from internal surfaces during evacuation phase is oxidized by means of chemical reaction of getter contained in tight volume; hydrogen is inverted into easily condensing composition; substance reacting with gases contained in heat-insulated space is used as getter; this is porous or powder absorber of hydrogen on base of oxides of metals with dispersed catalyst prepared in accordance with specific procedure. Automatic valve operates at temperature of external wall of inner pipe below the evaporating temperature of filler. EFFECT: enhanced efficiency. 2 cl, 1 dwg, 1 tbl