# US 4,394,929 A · Cryogenic liquid storage container having an improved access conduit

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- Number: US 4,394,929 A
- Document ID: US4394929A
- Status: Granted
- Kind: A
- Application number: 06/252,949
- Filed: 1981-04-10
- Granted: 1983-07-26
- Earliest claimed: 1981-04-10
- Assignees: Union Carbide Corporation
- Inventors: Nandlal P. Patel; Roger J. Dolida
- Web page: https://patentgrep.com/patent/US4394929A

## CPC

- F17C 13/005: {for medium-size and small storage vessels not under pressure (F17C13/008 and F17C13/02 - F17C13/12 take precedence)}
- F17C 2201/0109: with exteriorly curved end-piece
- F17C 2203/032: Multi-sheet layers
- F17C 2203/0341: Perlite
- F17C 2203/0391: by vacuum
- F17C 2203/0629: Two walls
- F17C 2205/018: Supporting feet
- F17C 2205/0305: Bosses, e.g. boss collars
- F17C 2221/014: Nitrogen
- F17C 2223/0161: cryogenic, e.g. LNG, GNL, PLNG
- F17C 2223/033: Small pressure, e.g. for liquefied gas
- F17C 2260/033: by enhancing insulation
- Y10S 220/901: Liquified gas content, cryogenic
- F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A double-walled vacuum insulated cryogenic liquid container wherein the access conduit is composed of a material whose strength increases with decreasing temperature with the conduit having a wall thickness which varies in a manner such that when the container is holding a cryogenic liquid, the ratio of bending moment stress in the conduit due to a selected applied force to the strength of the conduit material is substantially constant along the length of the conduit.

## Claims

### Claim 1

A vacuum insulated cryogenic container comprising:
an inner vessel for holding a cryogenic liquid, said inner vessel having an access opening;
an outer shell enclosing said inner vessel in a spaced apart relationship so as to form an evacuable space therebetween, said outer shell having an access opening disposed substantially in alignment with said access opening of said inner vessel;
thermal insulation material disposed in said evacuable space; and
an access conduit joining said access opening of said outer shell to said access opening of said inner shell such that said inner vessel is supported within the outer shell in said spaced apart relationship by said access conduit; wherein said access conduit is an elongated body having a substantially constant inside diameter of cylindrical configuration and a variable outside diameter which decreases linearly in dimension within said evacuable space to form a gradual taper from a point proximate to the juncture of said access conduit with said outer shell to a point proximate the juncture of said access conduit with said inner vessel, said variable outside diameter of said access conduit decreases linearly such that the ratio of stress in said conduit due to bending moment to said strength of said conduit material is substantially constant along the length of said conduit within said evacuable space between said two juncture points, said access conduit being composed of a material whose strength increases with decreasing temperature.