DE1932255A1 - Container for storing or transporting very cold liquids - Google Patents

Description

The invention relates to containers for storing or transporting large quantities of liquids, see their temperature. Volume. the ambient temperature differs very strongly ο An applicability of the invention is primarily in the case of containers with flat side walls for extremely cold liquids such as liquefied gas _? g _o B _ö Srdgas _§ given ₈ ά®τ © η pressure almost corresponds to the pressure of the atmosphere ₉ and the invention provides self-supporting cargo containers for transport means ₉ e.g. tankers, before ₀

In the construction of such containers for large amounts of liquid , it is difficult to provide sufficient strength of the construction such that the containers can be used as self-supporting cargo containers, that is, that the containers can be filled with a liquid without the need for the Support containers on the structure of the hull itself »to help prevent buckling or buckling of the container walls. These difficulties are compounded by two other factors.

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193225b

ßert, first of all by the rolling and stomping movements of the ship, which lead to unbalanced compressive forces on one or more walls of the Acting container, and secondly by the temperature gradient existing over the entire height of the container, and especially when the container is only partially filled with a liquid, the temperature of which is very different from the ambient temperature

Until now, it has been customary to test the structural or structural strength of containers with flat walls in the form of flat plates due to the use of vertically arranged stiffening beams with a relatively large static moment increase .. With this arrangement, there is still the Disadvantage that the vertically arranged carrier not only are heavily stressed as such, but that an additional stress by the prevailing in the container Temperature gradient is brought about because the carriers do not allow the bottom of the container to face the top of the container freely to contract or expand without bending moments are introduced into the vertical girders »

Around. eliminating these difficulties is in the UoS.A. Patent 2,982,441 discloses a container construction has been provided in which the container comprises flat side walls in a horizontal cross section, which consist of a for liquids and gases impermeable material consist of high strength, and in which several horizontally extending stiffening and reinforcing members arranged at vertical intervals one above the other, essentially without gaps over the entire Inner surfaces of the upright walls extend and are attached to them so that they are part of the Form walls, and "in which at least one horizontally arranged elongated tension or bracing member

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each two adjacent walls of the container connects to each other and at an angle between the adjacent parts of the attached to the walls, horizontally arranged and separated by vertical distances reinforcing members extends.

Usually such containers are manufactured and assembled separately from the associated tanker in order to their Eontage to be built into the holds of tankers. Recently, however, there is a tendency to create larger capacity tankers, and for the sake of simplicity and economy you do not need a larger number of small containers, but containers of larger ones Dimensions «Difficulties arise with such large containers because they are heavy and bulky are, and that the size of a container that is prefabricated and can then be built into a tanker thanks to the lifting capacity of the cranes available at the shipyard is limited. Therefore, it is desirable to have a container con. to create a structure that is as light as possible and its Parts in the hold of a tanker can be assembled to form a container. However, this is made possible by the Difficult to use a large number of stiffening members.

In addition, large self-supporting containers are extremely expensive since they do not have ordinary steel can use, because such a steel would become brittle at the low temperatures coming into embossing, so that you have to use expensive materials; therefore it is important to reduce the amount of metal required and as much as possible at the same time to maintain the required structural or structural strength.

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Further, it has been proposed to provide such containers, in each of which two walls are connected to each other by struts arranged in the interior of metal, that a cell structure is present · Such a construction is, for example, in the German .e.schrift, .- JZV · 1 274 144. It is also known to use panels built up from layers to produce the double walls of such containers; Such panels consist of two sheet metal walls which are connected to one another by a metal strut arranged in between so that a cell structure is present in the interior of the wall. Such a construction is described, for example, in the German - .r_c Tßchrift 1 272 323. In these constructions, the inner strut made of metal causes such a reinforcement that you can produce the curd surfaces in contrast to sander constructions from thinner metal sheets, and that it is possible to reduce the number and / or the section modulus of the stiffening members required

In such constructions it is envisaged that both Wall surfaces of each double wall are liquid-tight; here the inner wall acts as the first shell while the outer wall forms a second envelope in the event of a leak in the first envelope. These constructions however, there are several disadvantages. One of those drawbacks is that both individual walls must be given a considerable thickness, since they should be liquid-tight and have to withstand the hydrostatic loads caused by the cargo and inertial forces · A second The disadvantage is that if the first shell or the inner wall is damaged, it becomes flammable liquid cargo gets into the space between the walls, there is a significant risk if the Container has been emptied; this danger is due to both expansion and possible rupture of the cells

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as well as the fact that a flammable gas is slowly released back into the empty container, where it can mix with air creating a risk of fire or explosion.

The object of the invention is now to create a container construction in which one with a minimum amount of RIefall is sufficient, in which the required Constructive or structural strength achieved and with which it is possible to reduce the number and / or the section modulus of the stiffening members, so that you get by with a smaller amount of metal and the assembly of the container on the spot in the hold a tanker is facilitated o

The invention is based on a self-supporting rigid metal container for transporting or storing cold liquids ,, such as "liquefied natural gas, of the side walls, a floor and a ceiling comprising _s wherein at least some of the walls are constructed from layers IMD, each zvi & ± sheet panels and a strut of metal include _B which is arranged between the connecting Blechtafein ₅ si © and at a distance from one another · = hälto the basis of the invention liegend® object is achieved for such a container characterized ₉ that gesiäB of the invention, a DES Bleciitafela with Öffmmgea . accidentally _s while the other sheet metal is liquid-tight κ 3a.i © rfoei forms the liquid-tight sheet inside- = lisuEb l & © stiMst © r S © a © a © of the surfaces of the containers2? t7äsd® di © inner © Bl © @ hi7aad mad innarlialb other zones ocL © r Fläehea di © ä ^ ßss? © Bleciiwandg and di © beidea Blechband® siad aa transition point a ¥ © in a plan of the one kind su area of the other kind liquid-tight to one another

In this case, the arrangement is preferably such that the inner side wall along the bottom of the container is imd

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The container bottom is liquid-tight upwards to a certain height and then is provided with openings almost to the upper hand of the container, and that the outer viand within the bottom surface of the container and the corresponding lower parts of the outer side walls are provided with openings so that the liquid cargo within those parts of the outer side walls that are liquid-tight can enter the tree between the sheet metal walls forming the double walls _o

This construction offers the advantage that when a certain amount of metal is used, a maximum Strength and rigidity of the container is achieved, and that at the same time is prevented that the inner Cell construction forms pockets in which in the upper Part of the container gas and in the lower part of the container liquid cargo can be enclosed or retained »

To produce a container construction according to the invention, less metal is required than for a single-walled container of the known type, "since the inner struts from deeply between the walls create such a reinforcement that the total thickness of the" two wasdfiäolies. ! Your can be than the thickness of the wall of a one-handed container constructed in a known manner so that it is possible to reduce the number and / or the resistance of the additional stiffening members required su ·. To produce an invention according to a. A container construction requires a little less metal than a double-walled container of the known ax ₉ because in the latter case, where each wall should be liquid-tight and must withstand the hydrostatic stresses and inertial forces caused by the cargo, the individual walls must be given a considerable thickness, while with of the invention

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structure only one of the two wall surfaces within one any part of the container needs to be liquid-tight so that the adjacent parts of the other Can form wall surface with a smaller thickness.

In the container construction according to the invention, holes or openings are intentionally provided in such a way that all cells are in communication with the atmosphere either on the inside or on the outside, and that the openings are visible at all times from the inside or outside of the container, when the container is empty, so that it can be determined whether these openings or holes are clogged. It is therefore not necessary to provide devices for supplying and controlling the pressure of a chemically neutral gas, as is necessary in the case of the space between the walls of a double-walled container or a container with two envelopes of the known type. is _o

It is particularly noted that the invention. Container construction is intended for use only as a first shell. When a second case is needed such as the heat-insulating lining of the cargo hold or as a component provide them within the liner in a known manner. This thermal insulation can be of any suitable, be of a known construction corresponding to its purpose. This has the advantage that the second Sheath is completely independent of the first sheath, so that any leakage of the first sheath does not become one Endangerment of the second shell leads. On the other hand, if the walls of a double-walled container are the first and the form the second shell, this construction proves to be unreliable, since there is a crack in the first Sheath-forming inner wall made of sheet metal, via a connecting web, which is arranged between the shells

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Strut made of Xetall up to the second shell outer wall propagate kanru

By utilizing the space between the walls of the container construction according to the invention for receiving liquid cargo, the capacity of the container is increased compared to a double-walled container with two shells which is constructed in a known manner and has the same external dimensions _{or the like}

The invention and advantageous details of the He Findings are described below with reference to schematic drawings explained in more detail using an exemplary embodiment

Λ is a schematic cross-section through a tanker containing a container according to the invention

Fig. 2 shows an upper one on a larger scale Corner of a container according to the invention partly in section to show details of the construction inside close. '

Fig. 3 shows the same corner as Figo 2, where part of the outer covering of the wall has been omitted so that the cell construction and the openings can be seen,

According to Fig. 1, the container is arranged in the body 2 of a tanker, in which the container on any suitable way, e.g. by means of spacers 3 made of wood is supported with the trees between the spacers with any suitable insulating material are filled. In practice, various known methods can be used to insulate the container4 da However, the insulation used in each case does not form an object of the invention, which is exclusively related to Concerning the container construction made of metal, it should be noted that the insulation 4 shown in FIG. 1 can be any

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represents known insulation for such containers, lind that such isolation occurs in most cases known way formed a second container shell

The actual container is built up on panels comprising layers of metal and preferably of large dimensions and of any suitable type. More specifically, the container comprises inner side walls 6, an inner top wall or ceiling 7 and a lower inner wall 8. The inner walls 6 are connected to outer walls 9 by internal struts 11 made of metal which, according to FIG. Although the drawings for simplicity, show rectangular cells, but it is also possible, hexagonal cells provide _o According to the invention the cells of the walls 6 are shown in Fig. 1 and 3 manner shown provided with openings 12 ,, has When ground, the container the inner wall 8 no openings on doh.0 it is liquid saielit _a but is · cli © 2X.I? gsgealTöer- lisgsiicle üaad ij © Dssise ni © die üSnste 6 ESt öffir ^ mgen wsseiisr ^ The liquid ^ eil's & iehtc üaad S even sieia lan ^ s siass iibsclaüitös Ί4 ci *. of? lliiiissrsc. Ve: "^;;: ■ ■

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the container according to the invention has the same rigidity as Containers of known type, the walls of which comprise several layers, and compared to a single-walled container construction "known type enables the inventive Construction of an aluminum container saves metal of about 14%. The inner surface of the container top is made liquid-tight to prevent that gas trapped in pockets of the cell structure can be. The narrower wall of the container bottom is also designed to allow the liquid to run off to that arranged in the lower part of the inner container wall To facilitate cargo pump. The upper and lower double walls are less deep than the side walls Double walls so that there is only a small loss Capacity results. The vertical walls, which have a greater thickness, allow enlargement of the capacity in that not the inner " Walls, but the outer walls are formed in liquid form are. When all of the inner 'wall surfaces, be the first Envelope would be used, the loss of

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Claims (1)

1. Self-supporting rigid metal container for transporting or storing cold liquids.with side walls, a bottom and a container ceiling, at least some of these walls being formed by panels made up of layers, which comprise two flat material layers made of metal and struts made of metal, the latter between the Layers of flat material are arranged, connect them to one another and keep them at a distance from one another, as a result of which one of the flat material pieces (Ί3 ».6, 16) is provided with openings and the one belonging to it other flat material piece (8, 9, 7) is liquid that the liquid-tight flat material piece forms the inner flat material piece within certain areas of the container walls and the "outer flat material piece within other areas, and that said parts are made of the non-apertured flat material on the Transition point between the surfaces of one kind and the Fl Areas of the other type are connected to one another by a liquid-tight connection (14) _o 2 · Container according to_ claim 1, characterized in that g e k en.η draw t that at the bottom of the container. the liquid-tight piece of flat material the inner piece of flat material (8) is while at least over the major part the side walls of the container the outer piece of flat material- (9) the liquid-tight flat material is a piece. 9B8 & / 1109 - "* - ■ ■■■ - ■■■■ -. 5 ·. Container according to claim 2, characterized ge ken η ζ e i c h η e t that the side walls νοώ container bottom. are formed upwards over a short distance through the liquid-tight inner piece of flat material (8) 4-V; Container according to claim 2 or 3 »characterized ge k en η draws t that at the upper wall or the Cover of the container the liquid-tight piece of flat material is the inner piece of flat material (7) 5. Container according to one of claims 1 to 4, characterized g e k e nmarked that the liquid-tight Flat material has a greater thickness than the flat material provided with openings 6. Container according to one of claims 1 to 5, characterized ge ζ ei c h η e t that the between the Strut (11) made of metal, arranged in layers of flat material, is also made of a flat material or sheet metal which is less thick than the liquid-tight Flat material 9098857 1109