DE1956289A1 - Storage container for liquid gas - Google Patents

Abstract

1,261,258. Liquefied gas storage tanks. BRIDGESTONE LIQUEFIED GAS CO. Ltd. 14 Nov., 1969 [15 Nov., 1968], No. 55829/69. Heading F4P. In a liquefied gas storage tank comprising an outer shell, an insulating layer and a suspended, corrugated, inner membrane tank, recesses 13 are formed in the insulating layer to relieve stresses in the inner tank caused on charging the liquefied gas. The side wall of the inner tank is joined to the bottom wall 6 by a curved portion 5 over which the corrugations become gradually less pronounced and eventually disappear towards the tank bottom and the recesses 13 are formed adjacent the outermost crests of the corrugations in this region. As the tank is filled the corrugations are flattened out and the outer crests over the curved portion are forced into the recesses thus relieving any stress.

Description

1956 289 Andrejewski & Honke patent attorneys

Physicist Dr. Walter Andrejewski

r-,, Graduate engineer

_{Attorney's file} : 33 635 / Ti _{Dl> | ng Manfrea Honke}

Essen, November 6, 1969 Kettwig «r Strasse 36 (^)

Patent application
BRIDGESTONE LIQUEFIED
GAS COMPANY LIMITED
No.2, 1-Chome, Kyobashi,
Chuo-Ku, Tokyo / - Japan -

Storage container for liquefied gas.

The invention relates to a storage container for at low Temperature to be stored liquid gas, consisting of a rigid outer container with internal thermal insulation and a thin-walled inner container with its upper edge suspended from the ceiling of the outer container with rounded lower edges Side walls merging into the bottom wall, the vertical wavy folds of which gradually rounded off on these Lower edges run out.

00982 2 / U60

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse

In such storage containers, the vertical ones are wavy Gaps in the side walls of the inner container formed in such a way that they as a result when filling the deep-frozen liquefied gas Contraction of the container material and the internal pressure of the liquid gas disappear, so that the side walls practically move Apply tightly to the inner wall of the thermal insulation inside the outer container. As a result, the internal pressure becomes evenly transferred to the wall of the inner container via the pressure-resistant thermal insulation on the outer container, so that there are practically no tensions in the inner container and this essentially only needs to be liquid-tight. Nevertheless, storage containers of this type have a thin-walled inner container suspended in an outer container certain difficulties because, as already mentioned, the folds on the vertical side walls of the inner container in the The prevailing operating temperatures practically disappear when the inner container is filled, however, at the rounded lower edges this inner container, i.e. at the points where the vertical folds run out into these rounded corners, are critical Points result, since the wall of the inner container must also lie tightly against the insulating layer at these points, which is designed in the same way as the rounded lower edge. In reality, however, there is at these rounded lower edges a difference in length between the outer head line of such a fold and the inner head line of such a fold Crease is present in the vertical area of the same, i.e. the outer head line, i.e. the part of the crease which is closer on the insulating layer is longer than the inner head line of a fold, i.e. the part of a fold which is towards the center of the container and is further away from the insulating layer.

009822 / U60

Patent attorneys Dr. W. Andreiewslei, Dr. M. Honke, 43 Essen, Kettwiger Strasse

Therefore, if the rounded lower edge with the ones running into it Palten is stretched in such a way that it fits tightly to the insulating layer, an excess length of the outer head line remains available. This extra long results in a new palte, which can very easily be kinked sharply by the liquid pressure in the container, as it is not supported by any insulating layer will. By this sharp kinking of the newly created Palte can be made of thin sheet metal or the like Inner container can be damaged at this point. In other words, the inner container, which is only for a stress-free Use is formed, is subjected to tension at these critical points.

Here the invention aims to remedy the situation and form a storage container of the type mentioned in such a way that this excess length of the outer head line of a fold due to the length _T difference between this outer head line and the inner head line of a pallet in the vertical area of the rounded lower edge under operating conditions is collected in a suitable manner.

The invention proposes that in the similar or similar the rounded lower edges of the inner container formed lower edges of the insulating layer of the outer container behind the outer head line of the side wall folds accordingly the difference in length between this outer head line and the inner head line of the Palten depressions are formed, into which the newly created folds can be pressed by the internal pressure of the liquid gas, so that they too

009822 / U6Q

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse

critical points of the rounded lower edge that the inner container wall rests properly on the insulating layer of the outer container is achievable.

As a result, the internal pressure of the inner container is absorbed on all sides by the outer container without the inner container itself is subjected to any harmful tension.

A more detailed explanation of the invention emerges from the following description of a preferred exemplary embodiment with reference to the accompanying drawing; show it:

Figure 1 is a vertical section through a storage container of the type mentioned;

FIG. 2 shows a section from the rounded lower edge of the inner container;

FIG. 3 shows a view of a device designed according to the invention rounded lower edge of the insulating layer of the Outer container; and

FIG. 4 shows a section from the rounded lower edge of the insulating layer and the inner container lying on it to show the deformation of the side wall of the latter in a conventional one Storage containers.

The storage container shown in Figure 1 consists of a rigid outer container 1 made of normal steel with an inside Insulating layer 2 made of perlite concrete, or made of polyurethane

009822 / U60

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse 36

Rigid foam with appropriate compressive strength. Within this The insulating layer 2 is an inner container made of thin sheet metal of an alloy suitable for the low storage temperatures arranged. The side wall 3 and the bottom 6 of this inner container merge into one another via a rounded lower edge 5 and form a type of liquid-tight bag. The top edge 7 of this inner container is suspended from the superstructure 9 of the outer container by means of counterweights 8 that compensate for the weight.

The thermal contraction of the inner container in the vertical section is possible without difficulty in that each Part of the inner container can move unhindered in the direction of the upper arrows A. This movement is still through the rounded lower edge facilitates the sliding movement of the side wall of the inner container to the lower edge in a smooth Transition takes place. In the side walls 3 of the inner container vertically extending wavy gaps 4 are formed. When the inner container is at the low temperature of the liquefied gas is loaded by the pressure of the liquid on its walls, these wavy folds are stretched, so that the thermal Contraction of the inner container balanced in the circumferential direction and finally the outer surface of the inner container is practically smoothly close to the inner wall of the outer container, i.e. the insulating layer 2 is applied. As a result, the internal pressure is exerted on the inner container via this insulating layer in this area transferred to the rigid outer container, so that practically no stresses act on the inner container.

009822 / U60

Patent attorneys Dr. W. Andrejewski, Dr. M. Honice, 43 Essen, Kettwiger Strasse

However, this does not apply to the rounded lower edge into which the lower ends of the wavy gaps run, so that difficulties arise here. At this rounded lower edge, namely, the outer head line 10'-10 "is longer than the inner head line II'-1I" of each pallet 4 (see FIG. 2). Therefore, if the surface of the lower edge of the insulating layer is designed as a simple groove and the rounded lower edge of the inner container is pressed against the groove due to the pressure of the liquid after the expansion, this lower edge of the inner container is deformed in the manner shown in FIG. The line 4 drawn in dash-dotted lines in this FIG. 4 shows the state of a fold before the deformation of the rounded lower edge 5 as a result of the liquid pressure. After stretching the palte, point 11 'of the palte comes to point ll " ^f and thereby touches the insulating layer, this state being represented by the fully drawn line. Point 10' on the outer head line of the fold falls as a result of the thermal contraction of the Inner container in the vertical area with point 10 ^fM together, with shear forces also having an effect in the material of the inner container. Since the outer head line 10'-10 "of the pallet is now longer than the head line ll'-ll", which in turn is equal in length to the line II ¹ "-11", the result of the excess length resulting from the difference between the two lines is a new fold 12, which jumps in. Such an inwardly protruding fold is, however, absolutely undesirable, since the material on this folds at the prevailing fluid pressure Point sharply bent and can be damaged as a result.

009822 / U60

Patent attorneys Dr. W. Andrejewski, Dr. M. Honke, 43 Essen, Kettwiger Strasse

In order to ensure that the inner container rests firmly against the wall of the outer container, i.e. its Insulating layer 2, to achieve this, this insulating layer is cut out immediately behind the outer part of each fold, so that a depression 13 results, as shown in FIG. This allows the outer part 10 of each fold 4 at this rounded lower edge 5 of the inner container, if deformed as a result of the liquid pressure, move outwards, so that the formation of an inwardly facing fold 12 (Fig. 4) is prevented. The deformed outer part 10 a During the deformation, the fold is placed in the previously formed recess 13, so that there is also a good contact at these points of the inner container is achieved on the insulating layer of the outer container. Without creating an overly concentrated As a result, stress in the inner container becomes the internal pressure of the container to the outer container through the insulating layer transferred and collected by this outer container.

In addition to the training shown in Figure 3 can of course reach these recesses in such a way that the rounded lower edge of the insulating layer 2 is constructed from shaped stones with corresponding recesses.

Claim:

009822 / U6 *

Claims (1)

Patent attorneys Dr. W. Andrejewski, Dr. M. Honice, 43 Essen, Kettwiger Strasse Claim. Storage container for liquid gas at low temperature, consisting of a rigid outer container with internal thermal insulation and a thin-walled inner container with its upper edge suspended from the ceiling of the outer container and with side walls that merge into the bottom wall via rounded lower edges, the vertical undulating gaps gradually at these rounded lower edges expire, characterized in that in the similar or similar to the rounded lower edges (5) of the inner container (5-7) formed lower edges of the insulating layer (2) of the outer container (1) behind the outer head line (l0 ^f -10 ") of the side wall folds ( 4) according to the length difference between this outer head line and the inner head line (ll'-ll ") of the Palten depressions (13) are formed and thereby a smooth contact of the inner container wall also at these critical points of the rounded lower edge on the insulating layer of the outer container is achievable. PAe Dr Andrejewski, Dr Honke, 009822/1 460 Blank page