DE2150849A1 - Container, e.g. for liquid gas - Google Patents

Description

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Description of the patent application

GONGH ISTERIAIIOIAL KETHAJTE LIMITES, laas & u, Th * Bahaaae

concerned

Benalter, gB, for Plffriiggaa (addendum to patent application F 19 09 693.6)

The invention relates to containers for storing and / or transporting ^ liquids that are on a temperature which is ron the ambient temperature differs significantly, and is particularly concerned with an improvement on the invention the patent (patent application P 19 09 693.6} the

refers to the thermal insulation of calibrated containers.

The main patent relates to containers of the type mentioned and relates in particular to containers of the type eit a tank which is surrounded by thermal insulation in a rigid outer jacket and at least from below is supported by this thermal insulation. The invention is characterized in that it is less highly stressed Parts of the thermal insulation are a rigid foamed plastic material include, which is sprayed in place on the inside of the rigid outer jacket while Highly stressed parts of the thermal insulation made of a resilient thermal insulation material of higher strength exist.

209823 / Ü588

In the main patent, two exemplary embodiments are described with reference to FIGS. 1 to 3 of the main patent, in which it is a container of the type with a self-supporting tank, while the reference to Fig. 4 of the The main patent described container is designed as a so-called integrated tank. The present invention is limited on the other hand, a container of the type with a self-supporting tank.

In a container according to the present invention for storing and / or transporting liquids at temperatures, which differ significantly from the ambient temperature, and which includes a self-supporting tank which is enclosed by thermal insulation in a rigid outer jacket, the bottom part of the insulation being a resilient Thermal insulation material, which is rigidly attached to the The bottom of the outer jacket is attached and has no gaps extends across the bottom of the mantle, cn to support the container, enclose at least the larger parts of the insulating Lining the side walls of the shell corner sections from a resilient heat insulating material and a rigid foamed plastic material that is in place and place in the fiäu- ■ e delimited by the corner sections has been injected, with those corner portions which cover the lower corners of the shell, a component of the bottom portion of the insulation, and wherein the planes of the joints between the corner portions and the rigid foamed plastic material extending at an angle to the planes of the walls of the shell.

The invention and advantageous details of the invention are described below with reference to a schematic drawing explained in more detail using an exemplary embodiment.

209823/0588

The drawing shows a half of a cross section container according to the invention for liquefied natural gas, the is installed in a tanker.

According to the drawing, the tanker includes an outer one. Hull 1 and an inner hull 2. The inner hull, together with two transverse bulkheads, not shown, defines a hold *. The tanker can of course be provided with several such cargo holds. In the hold 3 a self-supporting T & nk 4 is arranged, which consists of a wetall that is not exposed to any Kaltverspröciung at the temperature of the liquefied natural gas, z. B. made of aluminum or a steel with a nickel content of 9 % · The tank 4 has a sufficient wall thickness and is stiffened so that it holds the liquid together; In the construction described, a bulkhead wall 5 extending along its center plane is provided in the tank. The tank 4 - is surrounded by thermal insulation, denoted as a whole by 6, which forms a lining for the cargo space 3. It should be noted that the drawing is not to scale and that, particularly for the sake of clarity, the insulation is shown on a larger scale than the part of the tanker shown.

The thermal insulation 6 includes a portion A, the forms a cladding for the floor and extends a short distance upwards along the side walls of the cargo space 3 extends, furthermore sections B, which form a cladding for the greater part of the side walls of the cargo space, and a section C which forms a cladding for the ceiling of the cargo space.

Section A of the thermal insulation is accordingly trained in the Ber ^ hreibune given in the main patent. Thus section A has a supporting pole?]

209823/0588

BATHROOM WIGINAL

on the floor of the hold? attached and evenly spaced are distributed, as well as relatively thick panels β 9us balsa wood, which are clad with plywood, with the column between the panels by compressed plastic material 9 are sealed; this section A forms a second barrier against the escape of liquid cargo. the Spaces between the supporting wooden strips? can with one rigid foamed plastic meterial, a fiberglass material or filled with a granular insulating material be. Between the bottom of tank 4- and section A. a suitable wedging or guide arrangement, not shown here, can be provided.

Each of the sections B of the thermal insulation is essentially formed as it is described in the main patent with respect to a section B; thus includes the Section B is a layer of constant thickness made of a rigid, closed-cell polyurethane material 11, which is in the form of several layers on the main parts has been sprayed onto the side walls of the cargo space. In this construction, however, layers 12 are made of a nylon fabric or braid inserted into the polyurethane support, while the construction according to the main patent in the polyurethane support layers of plucking are provided; the innermost layers of the fabric or braid extend according to the drawing without any gaps over the entire area occupied by the polyurethane pad.

The corners of the hold 31 which form the side walls, d. That is, the top and the vertical corners are clad with corner sections D, which are made of a load-bearing There are thermal insulation material and are essentially the same as section A according to the main patent; in particular in cases in which the container is intended to hold liquefied natural gas, it has been shown that

209823/0688 bad original

that the temperature gradient on the insulation, which is at least 160 0 for liquefied natural gas, leads to critical stress on the polyurethane material, which is due to the relatively high coefficient of expansion of this material, which is in the order of 40 to 50 χ 10 "m / m / ° C when the density of the polyurethane is in the range mentioned in the main patent. These critical stresses are particularly noticeable along the belts of the sections made of the polyurethane material, and when the corners of the hold include sprayed-on layers or preformed fillers made of this material If, as the main patent suggests, to form the vertical corners, the combined effect of the critical stresses attributable to adjacent wall sections could cause the corner sections to tear open, i.e., pull them away from the corners of the cargo space Each corner section D thus comprises supports isten 13 made of wood and panels 14 made of balsa wood, which are clad with plywood, and the gaps between the panels 14 are filled with a compressed plastic material 15. It should be noted in this regard that the corner sections along the lower sanders of the side walls are practically formed by sections of the insulation of section A which are angled upwards. In addition, as shown in the drawing, in this construction the container 4 is provided with a lower bevel 16, and the loading space 3 has a shape matching this bevel. Therefore, the side walls of the cargo space 3 are connected to an obtuse-Zvi sch provided _enabschnitt% at the another corner portion D is fixed. The connections between the sections B and the corner sections D are again essentially designed as described in the main patent, and each of these connections extends at an angle to the plane of the wall of the hold, which is defined by a right-hand winch.

209823/0588

kel is different. Furthermore, in this construction, the Layers 12 of nylon braid not according to the main patent set with the help of slots but they are with the Surface of the corner portions D connected by means of an adhesive. Tests have shown that a thermal insulation line arrangement of the type described above for the side walls and the floor of the hold 3 is impermeable to liquefied natural gas, so that this insulation · as a second Lock to effect; would come when the container 4- tear open should. In particular, tests were carried out on a connection produced in natural size from a pressable one Insulation and polyurethane carried out, which was formed essentially as described above; these tests were carried out at normal operating temperature and under different load conditions, the load being a multiple of the load that corresponded to the normal operation of a tanker it is to be expectedj there were no signs of this Arising from hoisting.

If necessary, the trees can be placed between the side walls of the container 4 and the cargo space 3 at least partially with an additional, relatively cheap thermal insulation material, e.g. B. a fiberglass material, are filled out, and therefore it is possible to use the described insulation arrangement made of polyurethane and a resilient insulation material only to be trained with such a dioke that they are considered to be second lock can come into effect. This fiberglass material can be used on the adjacent surface of the insulation assembly be supported as described in the main patent and / or on the outer surface of the container. Furthermore can provide a supporting frame construction, not shown, to hold the fiberglass material in its lace au.

20 * 123/05

It should be noted that the arrangement of the insulation of the Section C is such that it is not important that it be suitable to act as a second barrier that however, it is desirable that this portion be impermeable to splashing liquid. Therefore, in the case of the shown Construction provided a relatively inexpensive insulation that was a fiberglass material clad with plywood 18 17 includes.

Claim;

209823/0588

Claims (1)

CLAIM Containers for storing and / or transporting liquids at temperatures which differ from the UnieebunEG temperature differ considerably, irit a self-supporting 'rank, the is surrounded by thermal insulation in a rigid outer jacket, the Eouen section of thermal insulation a resilient thermal insulation material that is rigid is attached to the bottom of the shell and extends seamlessly across this bottom to support the tank, thereby characterized in that at least the larger parts of the insulating lining (6) of the side walls of the Shell's corner sections (D) made of a resilient thermal insulation material and a rigid foamed plastic material (11) which has been injected in place into the spaces delimited by the corner portions is that those corner portions (B) which cover the lower corners or edges of the shell, a component of the bottom section (A) of the thermal insulation, and that the planes of the arch or connection points between the Corner sections (D) and the rigid foamed plastic material extend at an angle to the plane of the walls of the shell. BATH ORIGINAL