Manhole structure of inner container and outer container of low-temperature heat-insulation container

Abstract

The invention discloses a manhole structure of the inner container and the outer container of a low-temperature heat-insulation container. The outer container is arranged outside the inner container, a manhole connecting tube passes through the outer container to be communicated on the outer wall of the inner container, the openings of the manhole connecting tube are fastened with manhole covers through fastening pieces, one end of the manhole connecting tube, which is extended out of the outer container, is sheathed with an outer manhole connecting tube, the outer manhole connecting tube is welded on the outer wall of the outer container, the openings of the outer manhole connecting tube are fastened with outer manhole covers through outer manhole fastening pieces, and a heat-insulation filling is filled in a hollow cavity formed between the outer manhole connecting tube and the manhole connecting tube. In the manhole structure of the inner container and the outer container of the low-temperature heat-insulation container, disclosed by the invention, two manhole connecting tubes are adopted, the heat-insulation filling is arranged between the inner manhole connecting tube and theouter manhole connecting tube, the two manholes are respectively opened, in this way, the manhole in the inner container has operability, the maintenance is convenient, and in addition, the low-temperature sealing technology is adopted, so that the heat-insulation effect is suitable for the storage of a low-temperature liquid medium.

Description

technical field [0001] The invention belongs to a low-temperature heat-insulated pressure vessel for storing liquid hydrocarbons, liquid natural gas, liquid oxygen, liquid argon and liquid nitrogen, and in particular relates to the manhole structure of the inner and outer containers of the low-temperature heat-insulation container. Background technique [0002] At present, the manhole structure of the inner container of the low-temperature adiabatic pressure vessel used to store liquid hydrocarbons, liquid natural gas, liquid oxygen, liquid argon and liquid nitrogen is fixed and cannot be opened for operation, that is, the process head and the inner container are directly used. The whole structure is set in the heat-insulating space, and only the manhole operation structure is set on the outer container. Although this structure ensures the storage tightness and heat insulation effect of the inner container, the manhole of the inner container is completely welded. The structu...

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Problems solved by technology

[0002] At present, the manhole structure of the inner container of the low-temperature adiabatic pressure vessel used to store liquid hydrocarbons, liquid natural gas, liquid oxygen, liquid argon and liquid nitrogen is fixed and cannot be opened for operation, that is, the process head and the inner container are directly used. The whole structure is set in the heat-insulating space, and only the manhole operation structure is set on the outer container. Although this structure ensures the storage tightness and heat insulation effect of the inner container, the manhole of the inner container is completely welded. structure, causing inconvenience for future maintenance operations

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