(1.) Field of the Invention
The present invention concerns holding containers for cryogenic liquids of the type comprising an inner casing and an outer casing defining an insulating inner space therebetween and a cryogenic liquid withdrawing pipe in the inner casing including a first portion extending into the inner space between a lower portion of the inner casing and an upper portion of the outer casing, for example, holding containers for distributing liquid nitrogen in particular, which are made self-pressurizable by means of said withdrawing pipe.
(2.) Description of Prior Art
In order to provide a gaseous phase at the outlet of a cryogenic liquid withdrawing pipe, the first portion, or internal portion of the pipe includes a section which is in heat exchange contact with the outer casing at least partially to vaporize the liquid which is withdrawn from the inner casing. Depending on the materials of which the outer casing and the pipe are made, joining of the section and the outer casing by brazing, welding or gluing would cause certain problems, for example deformation of the outer casing, and significantly increases the manufacturing cost.