|Publication number||US2864527 A|
|Publication date||Dec 16, 1958|
|Filing date||Dec 10, 1956|
|Priority date||Dec 10, 1956|
|Publication number||US 2864527 A, US 2864527A, US-A-2864527, US2864527 A, US2864527A|
|Inventors||Howard W Altman, Herrick L Johnston|
|Original Assignee||Herrick L Johnston Inc|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (25), Classifications (12)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Dec. 16, 1958 H. WJALTMAN ET AL 2,864,527
CONTAINER FOR LIQUEFIED GAS 2 Sheets-Sheet 1 Filed Dec. 10, 1956 INVENTOR. HOWAR D W. ALT MAN.
ATTORN EYS Dec. 16, 1958 H. w. ALTMAN ETAL 2,864,527
CONTAINER FOR LIQUEFIED GAS Filed Dec. 10, 1956 2 Sheets-Sheet 2 l\ \q l lllllllll T N l llllllllll O a R i\ IN VEN TOR. HOWARD W. ALTMAN.
AT TO R N EYS nited J CONTAINER FOR LIQUEFIED GAS Application December 10, 1956, Serial No. 627,412
3 Claims. (Cl. 220-14) This invention relates to apparatus for storing liquefied gases having boiling point temperatures materially below 273 degrees Kelvin.
In storing liquefied gases at low temperatures, insulated storage vessels are utilized, which vessels include a container for the liquid being stored surrounded by an airtight jacket spaced from the outer wall of the container. The air is exhausted from the space, and suitable insulating material may be placed therein, to form an insulating means which surrounds the container and shields same from heat leakage from the environment.
The present invention provides an improved vessel construction of the above described type that provides novel passage means for access to the interior of the inner container of the vessel without breaking the vacuum in the sealed insulating space between the inner container and the surrounding jacket. In general, the construction of the vessel of the present invention includes two aligned openings through the wall means of the inner container and the jacket, respectively. The openings are each provided with a removable closure and are connected by a passage through the insulating space. Such passage is formed by a thin walled cylindrical member that is longitudinally flexible to adapt same to elongate and contract responsive to variations in the space between the inner container and the jacket, said variations being caused by thermally imposed expansion and contraction of the vessel.
The thin walled cylindrical member forming the confines of the access passage has its inner end in sealed connection with the wall of the inner container means and its outer end in sealed connection with the jacket to form a passage that is completely sealed from the surrounding evacuated insulating space. Hence when the outer closure is removed from the opening through the jacket the vacuum of the insulating space will not be broken, and when the inner closure for the opening though the wall of the inner container is removed a Workman can pass through the openings and the passage connecting same and thereby gain access to the interior of the inner container.
It is therefore an object of the present invention to provide a vessel for storing a liquefied gas which vessel incorporates an evacuated insulating space surrounding an inner container means, and which vessel is provided with novel means for gaining access to the interior of the container means without disturbing the vacuum of the evacuated insulating space.
It is another object of the present invention to provide a storage vessel for a liquefied gas which vessel incorporates novel access passage means through inner and outer wall means separated by an insulating space, said access passage means being normally sealed from the enviroment yet provided with safety means for releasing gas from the access passage to prevent the buildup of pressure therein in the event leakage should occur from the container means to the access passage.
2,864,527 Patented Dec. 16, 1958 It is still another object of the present invention to provide a storage vessel of the type described that mcorporates novel access passage means that is maintained sale against pressure build-ups yet which is maintained' tion will be apparent from the following description,
- to annular member 36 at 59.
references being had to the accompanying drawings wherein a preferred form of embodiment of the invention is clearly shown.
In the drawing: 4
Figure 1 is an elevational view of a typical storage vessel for a liquefied gas having a boiling point temperature materially below 273 degrees Kelvin at atmospheric pressure, said vessel being provided with the novel access passage means of the present invention;
Figure l-A is an end sectional view of the vessel of Figure l, the section being taken along the line 1-A- 1-A of Figure 1; and
Figure 2 is a sectional view through the access passage of the vessel of Figure 1, the section being taken along a vertical plane through the centerline of the vessel.
Referring in detail to the drawing, Figures 1 and 1-A illustrate a vessel for storing a volatile liquefied gas such as liquid nitrogen. The vessel is indicated generally at 20 and includes an outer shell 21 that surrounds an evacuated insulating space 22. The vessel further includes suitable supports 23 and 24 and is provided with an access passage means constructed according to the present invention and indicated generally at 26.
As is best seen in Figure 2 the construction of access passage means 26 includes an outer closure 27 provided ViLh a handle 28. Closure 27 is removably fastened to annular member 30 by a plurality of bolts 31 and nuts 32, and a suitable seal such as a gasket 34 is interposed between confronting surfaces of closure 27 and annular member 30. The annular member 30 is welded to a second annular member 36 at 37, the latter being extended through a hole in jacket 21 and welded thereto at 39 and 40.
An inner closure 42 is provided with a handle 43 and is removably secured to annular member 44 by a plurality of studs 45 and nuts 46. A suitable seal such as a gasket 47 is provided betweeninner closure 42 and annular member 44, the latter being mounted in a hole through the wall 48 of an inner container indicated gen erally at 49, such inner container being the means for directly confining the liquefied gas being stored. Annular member 44 is secured to the wall 48 at the welds .50 and 51.
With continued reference to Figure 2, the confines of access passage 26 is formed by a thin walled tubular member indicated generally at 54 and provided with successive portions 55 and 56 which extend laterally of the axis of passage 26 in opposite directions so as to make the thin Walled member 54 longitudinally expandable when inner container 49 undergoes thermally imposed radial contraction when it is filled with the cold liquid to be stored. It will be understood that inner wall 48 is cooled to a lower temperature and at a much faster rate as compared to the outer jacket 21. When the cold liquid being stored is removed from inner container 49 the thin walled member 54 will readily compress when wall 48 moves outwardly under thermally imposed radial expansion of inner container 49.
As seen in Figure 2, an annular bracket 58 is welded A thin annular member 61 is interposed between the upper end portion 62 of thin Walled member 54 and bracket 58 and a weld 63 secures end portion 62 and thin annular member 61 to the bracket. It has been found that by utilizing thin annular member 61 in this manner the end portion 62 of thin walled member 54 is prevented from being burned during the formation of weld 63.
The lower end portion 65 f thin walled member 54 is welded to a thin annular member 66 at 67 to prevent burning of such lower end portion 65 which burning would occur werethe thin lower end portion 65 welded directly to the thick annular member 44. Thin annular member 66 is in turn welded to a thin upstanding shoulder 70 on annular member 44 at the weld 71 and thin annular member 66 and end portion 65 are thereby prevented from being burned and damaged during the formation of the sealed junction between thin walled member 54 and inner container 49.
In the event any leakage of liquid or gas occurs at the junction of inner closure 42 and annular member 44, there would be a pressure buildup in access passage 26 which could gradually increase, even where leakage is slight, to the point where dangerous pressures would be present in access passage 26. To eliminate the danger of any such pressure development a pressure relief means 74 is provided between the interior of passage 26 and the environment. Such pressure relief means can be mounted in a hole 75 through outer closure 27 and may be formed by a casing 76 which houses a ball 75 urged towards closure of a passage 77 by a relatively light spring 78. In the event pressure starts to build up in access passage 26 the ball 75 will be moved from its seat by the force exerted on the ball by the gas and such gas will escape through outlet 79 to the environment. Due to the unidirectional flow characteristic of pressure relief means 74, air from the environment will at all times be prevented from entering sealed access passage 26. That is, access passage 26 is prevented from breathing and the formation of frost and ice in passage 26, from condensed moisture in the air of the environment, is at all times prevented.
It has been found preferable to form thin walled mem ber 54 of a metallic sheet material of low thermal conductivity to maintain the heat leakage from the environment to a minimum. An austenitic type of stainlesssteel sheet, known to the trade as Series 300, and of a thickness of approximately .038 of an inch has been found to be ideal for the formation of thin walled member 54.
In operation, when the vessel is filled with a cold liquefied gas, by suitable conduit means and apparatus not illustrated, inner container 49 will contract radially relative to outer shell 21 and thin walled member 54 will expand as required without imposing damaging stresses on the sealed junctions at its end terminations. If it is desired to gain access to the interior 81 of container 49 the liquefied gas is removed therefrom, by suitable conduits and apparatus not illustrated, and when the inner container 49 expands radially the thin walledmember 54 will be compressed as required and-the sealed end connections thereof will at no time be subjected to excessive stresses that would otherwise break the sealed junctions. The outer closure 27 is next removed, and then the inner closure 42 whereby a workman can enter the interior 81 of innercontainer 49 by lowering himself through the access passage 26. After the workman has finished and has climbed out of the container the closures 42 and 27 are replaced and the inner container 49 is ready to again be filled with the cold liquefied gas. It will be understood that the vacuum of evacuated space 22 will at no time be disturbed by the above described operations and the expense and expenditure of time normally required to reevacuate the insulating space 22 is thereby avoided.
While the form of embodiment of the present invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.
1. In an arrangement for storing a liquefied gas having a boiling point temperature materially below 273 K. at atmospheric pressure, a manhole structure comprising, in combination: a container for the liquid being stored having an inner wall formed with a first opening, a jacket in spaced relationship with said container and having an outer wall formed with a second opening in registry with the first-mentioned opening, the first-mentioned opening being located inwardly of said outer wall, said two walls forming an evacuated-insulating space; a flexible channel member extending between said openings and in a direction transverse to said walls and defining an unobstructed manhole passage for providing access to the interior of said container, said flexible member is bounded by said evacuated insulation space and being secured in sealed relationship to said walls in such a manner as to preserve the evacuation of said space, a first cap removable to permit access to the interior of the vessel but normally positioned inwardly of said outer wall to close the opening of the inner wall, whereby said first cap prevents liquefied gas being stored under pressure in said container from contacting said flexible member, and a second cap removable to provide access to the interior of the flexible channel and to the first cap but normaly positioned to close the outer opening, whereby the second cap supplements the insulating efiect of the first cap and protects the first cap and the interior of the flexible member from atmospheric conditions.
2. The arrangement for storing liquefied gas as defined in claim 1, wherein said second cap includes a pressure relief valve.
3. In an arrangement for storing a liquefied gas having a boiling point temperature materially below 273 K. at atmospheric pressure, a manhole structure comprising, in combination: a container for the liquid being stored having an inner wall formed with a first opening, a jacket in spaced relationship with said container and having an outer wall formed with a second opening in registry with the first-mentioned opening, the first-mentioned opening being located inwardly of said outer wall, said two walls forming an evacuated-insulating space; a flexible channel member extending between said openings and in a direction transverse to said walls and defining an unobstructed manhole passage for providing access to the interior of said container, said flexible member is bounded by said evacuated insulation space and being secured in sealed relationship to said walls in such a manner as to preserve the evacuation of said space, a first cap having a diameter less than the diameter of the flexible member, removable to permit access to the interior of the vessel but normally positioned inwardly of said outer wall to close the opening of the inner wall, whereby said first cap prevents liquefied gas being stored under pressure in said container from contacting said flexible member, and a second cap removable to provide access to the interior of the flexible channel and to the first cap but normally positioned to close the outer opening, whereby the second cap supplements the insulating eifect of the first cap and protects the first cap and the interior of the flexible member from atmospheric conditions, and permits said flexible member to be repaired by removing the outer cover while the inner cover holds the liquefied gas in the inner container.
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|U.S. Classification||220/560.12, 220/901, 137/375, 137/264, 114/74.00A, 137/376, 220/567|
|Cooperative Classification||Y10S220/901, F17C13/005, F17C2203/014|