DE1506284A1 - Ships for the transport of liquid gases - Google Patents

Description

EDUARD LORENZ · BERNHARD SEIDLfcK · "mkkvm ι SEIDLER

LAWYERS
Bavarian Supreme Court · Higher Regional Court of Munich · Regional Courts of Munich | i§cQ6 2 8

8 Munich 22, Widenmayerstraße Telephone [0811] 297194/297834 Postal check: Munich 170280 Bank account: Bayerische Hypotheken- und

Exchange bank Munich Re 8787 Your reference Our reference 8269

John Joseph McMullen 15 Montclair, New Jersey (USA)

Ships for the transport of liquefied gases

The invention relates to ships for the transport of liquefied gases, in particular the arrangement and construction of the containers in ships in which liquid gas, for example methane or the like, is transported under approximately atmospheric pressure will.

It is known ships for the storage or transportation of liquefied gases with a low boiling point, for example Methane, to be provided with a double-walled container under approximately atmospheric pressure. The container construction is made from a closed inner wall and an outer wall, which are arranged everywhere at a distance from the inner wall, with her however, is connected by beams so that a self-supporting structure is obtained. In the middle of the ceiling of each container a dome is provided, which has shut-off devices, which are used to accommodate pipelines for filling and emptying

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of the container. The inner wall surrounds the liquefied cargo. Containers of this type have a large capacity of about 10,000 cubic meters. Therefore vertical bulkheads are provided which stiffen the container inside and divide it into compartments »

The invention now aims to prevent cracks that can form in the outer wall or the inner wall, through the Scaffolding of the beams connecting these walls are propagated to the opposite wall. According to the invention this is through the use of a new arrangement of connecting beams with overlapping flanges in the space between the Inside and outside wall achieved. The parts are connected to one another with screws, rivets or other mechanical means.

Another purpose of the invention is to create a novel connection between the inner wall and the outer wall. This connection consists of a connecting arm that is mounted with ball joints on the inner wall and the outer wall. With this novel arrangement, slight horizontal and vertical movements can occur in the event of thermal expansion and contraction take place between the outer and the inner wall, without the walls of the container excessively strong mechanical stresses that would otherwise lead to the formation of cracks or other damage to the walls.

Another purpose of the invention is to provide a thermal expansion to prevent excessive relative movement caused between the outer and inner walls of the container by

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that several vertical tendons are welded between the outer and inner walls of the container. Every tendon has an I-profile and has a web of two overlapping Plattenι mechanically by screws or the like are connected to each other. Each plate is integral with a flat mounting plate. The two mounting plates are welded to the outer or inner wall of the container.

Another purpose of the invention is to provide a self-supporting frame which is welded to and supports the outer and inner walls of the container. This framework has an array of box section beams along the top and bottom of the container. The arrangement of box profile girders has a horizontal and a vertical beam, which form the inside and the corner of the box profile frame, as well as another plate with a vertically arranged, upper leg and a horizontally arranged, lower leg with a rounded outer edge, the legs to close the Box profile are welded to the horizontal or vertical support. Along \ the Kaetenprofilgerüst within the support system for 'reinforcement two angles are arranged at regular intervals, which are mechanically connected to one another by overlapping seams. Above the boundary of the box section support system, plate-shaped projections extend outwards, which have overlapping parts in the area of the space between the inner and outer walls and support and define outer wall parts that are aligned just outside the boundary of the box section support. There are also several

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wedge-shaped gusset plates are provided, which the plate-shaped Support extensions and distribute the force present at the connection between the inner wall and the girders of the system. '

Another object of the invention is to provide a novel support and wedge arrangement which will maintain the aligned position of the container in the ship but with a strong one A change in temperature of the container allows thermal expansion in all directions. For this purpose, several pillars are provided on top of the double bottom or the inner hull of the ship, which the container at a distance from the double bottom and prevent the very low temperature from being transmitted to * the outer structure of the ship. These pillars are made of insulating material, such as balea wood or the like. On the underside of the bottom of the outer wall of the container several foundations are installed at points that are vertically aligned with the pillars. These foundations consist of two or a plurality of vertical plates arranged at right angles to one another and of a horizontal plate, which is arranged at the lower edge of the vertical plates and with the flat upper surface of the associated pillar cooperates. In the event of a lateral expansion of the container, the lower plate of the foundations therefore slides on the flat surface of the pillar without the force transmission between the ship's bottom and the container being impaired. To maintain the aligned position of the Container in the ship are provided several wedges extending along the longitudinal and transverse center lines of the container in Extending spaced apart through the bottom of the outer wall.

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An expansion and contraction along the longitudinal and transverse median line the container can therefore only take place in these directions, so that the container is in its position in alignment with the ship will be held

The invention also aims to make the container in a relatively short Time to cool down from the ambient temperature to a temperature at which liquid gas without excess evaporation losses can be initiated. According to the method according to the invention, the inner container, the insulating space and the space between the walls dehydrated and purged with nitrogen gas at about 0 ° C. Then cold nitrogen gas is circulated through the mentioned spaces and liquid gas (methane) is injected directly into the inner container. In the heat exchanger, liquid methane is used as a coolant for cooling the nitrogen gas until a predetermined one Temperature difference (10 ° C) between the methane vapor and the container wall is reached. After that, the liquid methane replaced by liquid nitrogen as a coolant. The liquid charge is introduced when the container has a temperature of has reached about -140 ° C.

When the liquid methane is at the ballast level, that in the isolation room and the wall gap becomes Nitrogen circulated continuously through the heat exchanger using liquid methane as the coolant.

Other features of the invention will become apparent from the detailed below Description on the basis of the drawings.

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In these shows

1 shows a ship serving for the transport of liquefied gas with a number of containers according to the invention,

Fig. 2 is a vertical section along the line 2-2 of Fig. 1, Fig. 3 is a horizontal section along the line 3-3 of Fig. 1 »

4 in horizontal section with parts exploded, the corner construction of one of the double-walled containers according to the invention with an embodiment of the connecting links,

Fig. 5 is a vertical section along the line 5-5 of Fig. 4,

6 shows a lower corner of one of the containers in vertical section,

j as well as the box profile frame with the cooperating, plate-shaped extensions, the two container walls and the tendons,

■ Fig. 7 is a horizontal section on the line 7-7 of Fig. 6,

; Fig. 8 in horizontal section a second embodiment of the J connecting links,

FIG. 9 is a side view taken along line 9-9 of FIG. 8;

Fig. 10 is a vertical section along the line 10-10 of FIGS. 9 and

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Fig. 11 echematically the device for carrying out the process, according to which the containers are cooled and filled and kept cold in the ballast state *

From Fig * 1 a ship 10 can be seen »that for the transport of Liquid gas is used «It has four cargo containers 12, which are arranged at a distance from one another along the longitudinal axis of the ship. Each container 12 extends from the floor to the ceiling of the fuselage and has a capacity of 10,000 to 17,000 cubic meters

It can be seen from FIGS. 1, 2 and 3 that the inner and outer hulls 14 of the ship 10 serve as a housing for the container 12. This is supported by the outer foundations 16 and a number of wedges 18 'penetrating the bottom of the container, carried and held at a distance above the bottom of the fuselage. the Foundations 16 are integral with the bottom of the outer wall 22. Each of them has at least two at right angles to each other arranged »downward-facing steel plates which are welded with their upper edges to the bottom of the wall 22 · The edges of these

Plates are directed obliquely downwards and inwards. A flat steel plate is welded to the lower edges of these plates and is arranged in a horizontal plane. on Pillars 17 are mounted on the upper side of the inner floor of the fuselage, each of which is vertically aligned with one of the foundations 16. Each pillar 17 consists of a non-heat-transferring, load-bearing material, for example balsa wood or the like. The pillar 17 has a flat upper surface »on the

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the horizontal plate of the foundation 16 rests slidably. Of the Pillar 17 can be attached laterally in a suitable manner to the top of the inner hull.

Due to the low operating temperatures of the walls, floor and ceiling of the inner hull lh covered with an insulating material 20, such as balsa wood, foam plastic, polyurethane, mineral wool wadding or the like. The wedges 18 penetrate the bottom of the double-walled container. Each wedge has a plurality of plates welded to one another, which together form a flat bottom and flat side walls, which abut slidably against the keyways formed by the U-profile 19 made of insulating material. The U-profiles 19 and the wedges 18 are arranged along the longitudinal center line and in the transverse direction along the transverse center line of the container and hold it in its position in alignment with the ship; however, they allow thermal expansion in all directions

The container 12 has a corrugated outer wall 22 and a corrugated inner wall 21. These walls are arranged so that the waves facing each other are aligned with one another and the waves directed away from one another are also aligned with one another. Between the insulation and the outer wall 22 wedges 21 are mounted in a suitable number, which one by thermal expansion Allow vertical relative movement caused between the insulation and the outer wall 22 and thereby the aligned position the container wall maintained. The inner wall 22 and the outer wall 24 are shown in FIG

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Arranged at a distance from each other. The space between these walls is called the wall space. The outer wall 22 is furthermore arranged at a distance from the insulation 20. This gap is called the isolation gap. The inner container is divided into four by a longitudinal partition 26 and a transverse partition 28 Container compartments divided. The bulkheads 26 and 28 can be provided with a number of stiffening members (not shown) in the usual manner.

To increase the strength of the container walls and to allow relative movement between the walls 22 and 24 are on the side walls, the ceiling and the bottom of the container in Distances from each other horizontal support 30 and vertical support 31 mounted. The carrier 30 penetrates the inner wall 24 and ends in the form of a flange 34. Another flange 32 is welded to the outer wall 22 and extends inward. the Flanges 32 and 34 overlap one another (see FIG. 5) in the wall gap and are held in place by screws 36. the Flanges 32 and 34 are designed so that they overlap each other only in the area in which the corrugations of the walls 22 and 24 closest to each other (see Fig. 4). At the places where the waves are furthest apart, the limit Flanges 32 and 34 openings 38 which are so large that they can serve as manholes so that personnel or instruments Can move unhindered in the wall space when tests are carried out on both walls at the same time for safety reasons should be, for example on gas tightness and the like. The openings 38 also allow free circulation of inert gas.

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The arrangement of the overlapping flanges 32 and 3H represents a safety measure which prevents cracks which form in the inner wall 24 from spreading through the connecting links propagate to the outer wall 22. In the arrangement according to the invention, cracks, which are in the Form outer wall 22, not propagate to inner wall 2H. Therefore, if a crack forms in one of the two walls, it can only propagate to the flange on which that wall is located is assigned, but not over the other flange.

Figures 8, 9 and 10 show another arrangement for connecting the inner wall and the outer wall. Horizontal supports 30 are welded to the inside of wall 24 in the manner described above. A movable connecting member 100 is provided, which has a base plate 102 which ^{is welded to the shaft 24 f} , which protrudes into the space between the walls. A disk 104 is welded onto the base plate 102 and has a socket 106 facing the opposite wall. Furthermore, a holding cup is welded onto the base plate 102 and is coaxial with the disk 104. The distance between the two walls is maintained by a connecting arm 110 which has a ball at each end which engages in the corresponding socket 106. Just inward of the spherical ends, the arm 110 has thickened, rounded parts 103 which interact with the inner surfaces of the holding cups 108. A tube 112, which is preferably coaxial with the arrangement 100, is welded to the wall 21 and the carrier 30.

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This movable member allows for a slight relative movement, e.g. of 2 or 3 millimeters, between walls 22 and 24.

At horizontal distances from each other, preferably close by of the lower part of the space between the wall "tendons 40 are arranged in the form of I-profiles" These have webs which in a vertical plane are arranged, and flat mounting plates 42 and 44 which are welded to the outer wall 22 of the inner wall 24. The web of each I-profile beam 40 consists of two overlapping plates 46 and 48 which are fastened together with rivets or screws 50 from the same Reason given above for flanges 32 and 34. The I-profile 40 not only prevents vertical and horizontal relative movement between the inner wall 22 and the outer wall 24, but also distributes vertical stresses that would normally place unfavorable stress on the beams. The I-profile 40 is preferably mounted between the walls at locations where the corrugations of the outer and inner walls face each other and have the smallest distance from each other. Furthermore, the I-profile beams 52 are at suitable, horizontally spaced locations between the inner and outer walls arranged at the bottom of the container as well as the I-profile girders 40 «The number in which the tendons 40 are used, depends, among other things, on the highest expected temperature difference between the ceiling and the bottom of the container 12.

The clamping member 52 arranged between the bottom parts of the double-walled container does not necessarily need to be movable

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Arrangement 100 to exist because it can be assumed that the Bottom of the container 12 in contrast to its vertical. Walls 22 and 24 are at the same temperature everywhere *

The self-supporting frame for the container consists of a reinforced box profile girder system that surrounds the lower and upper edge of the container .ganz extends all around this and is provided with vertical, reinforced uprights 39 on the vertical edges of the container. According to FIG. 6, the Box section girder 33 has a vertical girder 56 which is welded at its upper end to a horizontal girder 30. These two supports form the top and the inner side and ·. the corner of the box profile. The outer parts 34 of the carriers 30 and 56 end in the wall gap and overlap the plate-shaped ones Extensions 35, which extend beyond the outer boundary of the box profile girder. The outer and lower Side of the box are formed by a further plate 37, which has a vertical leg 39 and a horizontal leg 41 has · These legs are welded to one of the plate-shaped extensions 35 each. This is how the box section is closed. For reasons of strength, the plate 37 has a rounded corner. The carriers 30 and 56 and the extensions 35 and the plate 37 extend over the entire length of the respective Container edge.

On the inside of the horizontal and vertical supports 30 and 56 and the plate 37 are vertically arranged angle plates 38 and 60 welded on to further the box section support frame

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to reinforce and stiffen. The angle plates 58 and 60 are connected to one another by riveted or screwed overlap seams 43 connected and delimit an opening 45 through which a man can pass when this for inspection or maintenance is required.

According to FIG. 6, the outer and inner walls of the container end at the box section support. The outer wall 22 is perpendicular to the plate-shaped extensions 35 are arranged. The wall 24 is arranged perpendicular to the beams 30 and 56 and is welded to them. To distribute the stresses that occur at the junction between the inner wall 24 and the beams 30 and 56, wedge-shaped gusset plates 62 are provided, one leg of which with the corresponding wall and its more perpendicular to it , Leg is welded to the corresponding carrier. There are more gusset plates 63 are provided, one leg with the plate-shaped extension 35 is welded and is flush with the wall 22, while the other leg with the legs 39 and 41 of the plate 37 is welded. In this way, stresses occurring in the walls 22 and 24 are spread over the entire container transferred to the box section frame.

Each compartment of the container 12 is electrically powered Submersible pump, which is attached to the bottom of the tank.

and is designed for a flow rate of about 350 m / h. Such pumps are known and work up to one Fluid level of 12 5 mm above the suction opening of the pump is perfect .

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Each container compartment is equipped with a filling line, a removal line, a gas suction line and an inert gas line, furthermore with safety valves, vacuum valves (all these parts are not shown) and other necessary connections »which are common with containers of the present type. The safety valves form two relief systems, one on starboard and one on port. The vacuum valves serve to protect the containers against excessive negative pressures. These vacuum valves are connected to a methane pressure system that operates under a low Overpressure is maintained.

With reference to FIG. 11, the method and apparatus for cooling and filling containers will now be as described above Type described.

Liquid methane must not be placed in a container that is at ambient temperature. For safety reasons the container must be cooled to about -140 ° C before the liquid methane charge begins.

Before the containers begin to cool, they must be flushed with an inert gas. For this purpose, a nitrogen generation plant is used a quantity of nitrogen is generated and stored under pressure in large containers.

Any suitable device can be used to flush the spaces and the container with inert gas. For example, can install pipelines that lead through the insulation space to its lower end and through the gas-tight outer wall 22

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through with the wall space at its lower end in communication. The one arranged within the isolation room Part of the pipe has openings at the bottom through the gas can enter the isolation room. A separate pipeline leads from the inert gas source to the inner vessel. At the top of the Suitable manifolds are installed in the insulating space and the space between the walls, which feed the inert gas to a fan.

Any suitable arrangement can be used as long as the inner wall 22 and the outer wall 24 are kept gas-tight.

Before filling the insulating space and the space between the walls with Inert gas, the air contained in these rooms is circulated two or three times through the drainage units to remove the Reduce the moisture content of the air.

After the dehydration, the inert gas, in the present example nitrogen, is released from the heat exchanger into the inner vessel and into the insulating space at a temperature of 0 ° C., whereby it flows in the inner vessel and the insulating space from top to bottom. The inert gas then flows in the wall gap of the cargo container up to a fan and is blown out until the spaces and the container are purged. The Stick "material gas is now at a temperature of 0 ⁰ C. After an exchange of two or three volumes of the container, the wall space and the insulating space are uniformly cooled to about 0 ° C. This measure takes about five hours for a container with an epLnem capacity of 10,000 m. To

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After flushing, the blow-off opening is closed and the nitrogen is circulated through the heat exchanger.

When the rinse is finished, the containers begin to cool. The heat exchanger is initially fed by a liquid gas source (in the present example a source of liquid methane), so that the nitrogen assumes a lower temperature than in the flushing process described above. The nitrogen gas will again circulated with a fan through the insulating space and the wall space of the container, so that the inner wall 22 and the outer wall 24 of the container can be cooled uniformly. That Methane given off by the heat exchanger is now in vapor form, but its temperature is much lower than that Ambient temperature. This vaporized methane is led through pipes and then released directly into the container, so that this is cooled down inside. The methane gas rising in the container is collected and fed to a heating device. in which it is heated to around 15 ° C and then fed to a gas turbine or a fuel tank. if this captured methane gas is not used as fuel, it is circulated to a cooling device located on land, in which it is converted back into liquid gas. It is then fed back to the main storage container. To cool down the To accelerate the container, a small amount of liquid gas, e.g. liquid methane, injected directly into the container.

The performance of the fan and the heat exchanger are preferred set so that at the beginning of the cooling process

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Temperature difference between the top and the bottom of the container is not higher than 25 ° C.

After a cool-down period of about 65 hours, the isolation room, the wall space and the container are on top of one another Temperature of around -130 ° C. When the container temperature has reached -130 ° C, the cooling of the container can be through various Measures are accelerated.

A measure to further reduce the temperature of the container and the insulating space and the wall gap consists of the heat exchanger using liquid nitrogen instead of liquid methane to feed. The nitrogen gas is circulated for a further 15 hours, after which the bottom of the container has a temperature of -140 ° C reached. If the isolation space, the wall space, the container and the side walls of the container are on one Temperature of around -14-0 ° C is the liquid methane introduced directly into the container through the filling line.

Another measure to reduce the tank temperature below -130 ° C is to use a heat exchanger with a Area of 100 m to another heat exchanger with a considerable larger area.

The method according to the invention enables four containers of 10,000 m to be cooled in a total time of about 80 hours from the drainage to the filling of the container with liquid methane. As a result of passing the cooled nitrogen gas between the insulation space and the inter-wall space of the container

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the insulating space, the wall space, the inner wall 22, the outer wall 24 and the interior of the container are cooled at the same uniform rate.

When the container is completely filled with liquid methane, its low temperature is maintained by evaporation. The vaporized gas is collected and can be used as fuel. According to the invention give the am Boden.der container arranged pumps from a small amount of liquid methane to the heat exchanger, while the nitrogen in the isolation room and the Wall gap is circulated. In this way, the circulated nitrogen is kept at around -145 ° C.

When the ship has reached its destination and delivers the cargo down to the ballast, the remaining liquid becomes methane kept cool and maintained the aforementioned temperature difference of 25 by passing nitrogen through the heat exchanger circulated and pumped liquid methane is used as a coolant. The liquid methane given off by the heat exchanger is piped to the top of the container and injected into the container, thus the top of the container is kept at such a temperature that the above-mentioned temperature difference is maintained. Trips with only ballast are a bit dangerous. The nitrogen and methane vapor recirculation mentioned above also serves as a safety measure to prevent explosion and rapid evaporation. It goes without saying that when traveling with Any suitable refrigerant used for cargo and ballast

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can be, in particular any suitable liquefied petroleum gas that can be stored on board under pressure. But you can get on board also use a liquid nitrogen generator for this purpose.

An embodiment of the invention is illustrated below a container of 10 000 m described. The area between

2
the tank walls is 1500 m and the total area of the insulating

2
room is 6800 m.

With the help of a nitrogen generator, nitrogen is extracted from the atmosphere and stored in large storage containers in liquid form supplied ^ which are on land. For draining the insulation and the isolation room becomes air in three volume exchanges through the isolation room, the wall space and two drainage units guided. For flushing, liquid nitrogen is fed from shore to a heat exchanger on board, in which the nitrogen evaporates and from which the nitrogen is released to the isolation room at a temperature of around 0 ° C. The entire container, the insulating space and the space between the walls are flushed with the help of a blower, which has a conveying capacity of 60,000 m / h and is mounted in the area of the container. This fan sucks air out of the said spaces and blows the air off through a vent. This rinsing of the tank and rooms is carried out until two or three Volume have been exchanged, which is the case after about five hours. If there was only nitrogen in these rooms the vent is closed. The fan then feeds the heat exchanger and the source of liquid nitrogen becomes

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locked. The isolation room, the wall between the wall, the fan, the heat exchanger and the connection extensions now form a closed circuit, which is filled with nitrogen gas, the is constantly being circulated.

After that, liquid methane is made from large storage tanks on land fed to the heat exchanger. These storage containers serve as buffer containers for the circulated nitrogen gas. If the Introducing the methane into the heat exchanger begins (time zero), the fan is set so that it is the nitrogen in a Circulates amount of 10 exchanges per hour. The heat exchanger has an area of about 100 m. The nitrogen is quickly cooled. The methane exits the heat exchanger in vapor form and is returned to onshore collection containers, to be liquefied again. The heat exchanger and the fan are adjusted so that the temperature difference between the top and bottom of the container does not exceed 25 ° C.

During a period of 75 hours beginning in the fifth hour or when the container wall temperature is around -20 ° C approx. 6 t of liquid methane is injected directly into the container * If the temperature difference between the container wall and the methane vapor is no higher than about 10 ° C the supply of liquid methane gradually decreased to zero over a period of 20 hours.

When liquid methane has been passed through the coils of the heat exchanger for 65 hours, the container is in place

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and the gas at practically the same temperature, so that the container temperature can no longer be reduced quickly by this measure. Now the heat exchanger is used instead of the liquid methane Liquid nitrogen supplied. At the same time, liquid methane is directly in again in a large amount per unit of time introduced into the container until it has reached the desired temperature.

During a period of about 15 hours the heat exchanger is turned on Liquid nitrogen supplied until the nitrogen gas and the container has cooled to about -140 ° C. In order for the container to reach this temperature in about 80 hours, about 82 tons Methane and 36 tons of nitrogen evaporated. After 80 hours "" is located the bottom of the container (this does not apply to the accumulating liquid methane) is at a temperature of around -144 C. and the ceiling at a temperature of about -139 ° C. The inner vessel is then filled with the cargo consisting of liquid methane. At the same time, there is an excessively high rise in gas pressure avoided by blowing gas through suitable blow-off valves from the interior of the container.

During a ballast trip, the nitrogen gas is exchanged with 20 kept in motion per day so that the »temperature difference between the ceiling and the bottom of the container is 25 ° C does not exceed. During the ballast journey, 46 t of liquid methane per hour are passed through the heat exchanger the nitrogen at the low temperature of -141 C.

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keep. The methane given off by the heat exchanger is direct injected back into the container ,,.

When the container is full, that is given off by the heat exchanger Liquid methane heated to 15 ° C and fed to the boiler as fuel.

It goes without saying that further modifications are possible within the scope of the inventive concept.

Patent claims:

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Claims (1)

Claims 1. Transport container for storing liquids. , as approximately under ambient pressure »with an outer wall and an inner wall arranged at a distance therefrom» characterized »in that tendons are provided» the relative movement between the outer and the Prevent inner wall »with each of these tendons arranged in the space between the outer and inner walls and has two mounting plates »one of which is attached to the outer wall and the other to the inner wall » as well as a web with the fastening plates arranged vertically between the fastening plates at right angles to them connected is. 2. Container according to claim 1, characterized in »that the Web has two overlapping plates, which by mechanical means, for example screws or the like are connected to each other »and one of these plates on the • inner mounting plate and the other of these plates on the opposite mounting plate is mounted. 3. Container according to claim 1 or 2, characterized in that in the vicinity of the lower end of the vertically arranged walls of the container a plurality of tendons are provided and the vertical dimension of the web is greater than its horizontal dimension. - 24 - 909844/07 1t - 21 * - H. Transport container for the storage of liquid gas almost under ambient pressure, with an outer wall and one at a distance from it arranged inner wall, characterized in that a box profile support system is provided along each edge of the container, the box section girder has a first and a second, flat carrier plate has, which are mounted at right angles to each other and form the inside of the box, also another plate with two legs and a rounded corner, these legs near opposite ends of the first and the second, flat support plate are mounted, so that the closed box section beam is obtained, and two reinforcement brackets, which are arranged in a vertical plane and mechanically connected by an overlap seam and in the box section beam are mounted to reinforce it. 5 * Container according to claim 4, characterized in that plate-shaped Projections are provided which partially overlap each of the flat carrier plates, each of the plate-shaped projections extends beyond the boundaries of the box profile girder, the inner wall has portions mounted to each of the first and second planar support plates perpendicular to it extend and end at her, and the outer wall has parts, which are mounted on the plate-like extensions, at right angles extend to them and end at them " 6. Container according to claim 5, characterized in that triangular Gusset plates are provided, each of which has an edge on the opposite side of the outer wall parts - 25 909844/071 t BAO OB) QfNAt plate-shaped extension is welded and mounted with a second edge on the outside of the further plate. 7. Container according to claim 5 or 6, characterized in that a second set of triangular gusset plates is provided, which are mounted with one edge on an inner wall part and with a second leg on the adjacent, flat carrier plate. 8. Container according to one of claims 4 to 7, characterized in that that along the vertical edges of the container vertical, hollow stands are provided, each at a connection point are mounted between two of the box profile girders. 9. System for wedging and supporting a storage container for the transport of liquefied gas approximately below ambient pressure in a transport ship that has an inner hull, characterized in that, that on top of the inner hull several spaced pillars are mounted, each of which made of load-bearing insulating material, for example balsa wood or the like, is attached transversely and a flat has upper surface, several foundations are mounted on the underside of the container, each of which is vertical with one of the pillars align, each foundation has at least two vertical plates, which are mounted at right angles to each other, and one horizontal plate mounted on the lower edge of the two plates and slidable on the upper surface of the pillar rests. 909844/071 * BATH 10. A container according to claim 9, characterized in that a first insulated U-profile is mounted on top of the inner hull, which is vertically aligned with the longitudinal center line of the container, a second insulated U-profile is mounted on top of the inner hull that is vertically aligned with the transverse center line of the container »and several wedges are mounted on the container that extend up to extend below the bottom of the container and are slidably supported by the first and second U-profiles. 11. A method for cooling and filling a double-walled transport container for liquid gas, characterized in that the spaces in the inner vessel and the outer vessel are first drained and then flushed with nitrogen gas, which is then passed through a Heat exchanger is circulated, in which liquid methane serves as a refrigerant, while cooling and circulating the nitrogen gas Liquid methane is injected into the inner vessel until the temperatures of the inner and outer vessels reach a predetermined value reach, whereupon liquid nitrogen is used in the heat exchanger as a coolant, until the temperatures of the interior and of the outer vessel reach a second predetermined value, and then the inner container with the liquid methane to be charged is filled. 12. The method of claim 20, wherein the outer wall of the container is spaced from the ship structure and with it delimits an insulating space, characterized in that the insulating space is also used when the inner and outer vessels are drained is drained when rinsing the inner and outer vessels - $ 27 909844/071 BAD ORlGINAL. the isolation room is flushed with nitrogen gas, this 3-nitrogen gas circulated through the heat exchanger and there by the liquid methane and later when circulating the nitrogen gas in the outer container is cooled with liquid nitrogen as a coolant. 13 »The method according to claim 11, characterized in that the liquid stethan is injected directly into the inner vessel when the Container wall temperature is about -20 ° C, and the inner vessel to be charged liquid methane is supplied when the container is a Temperature of about -ItO C reached « It procedure for keeping the temperature of a liquid gas transport container low, which has an inner vessel and an outer vessel arranged at a distance therefrom, which in turn is under Formation of an isolation room is arranged at a distance from the hull of a transport ship that is in the ballast state, wherein the outer vessel and the isolation rooms are filled with cold nitrogen gas and the inner vessel partially with liquid methane is filled, characterized in that the nitrogen gas, the is located in the outer vessel and the isolation room, constantly circulated through a heat exchanger and part of the liquid methane is pumped through the heat exchanger as coolant and then supplied as steam to the upper part of the inner vessel in order to to cool the container further. 15. Containers in a ship for the transport of liquefied gas, for example methane or the like, approximately below ambient pressure, * the container having an inner wall and one spaced apart from 909844/0711 - 2 B - her arranged outer wall has, with the inner wall several carriers are connected, each one at a distance inward from the inner wall disposed inner edge, and each beam is generally perpendicular to that part of the inner wall with which the beam is is connected, characterized in that a plurality of connecting members are provided, which are located in the space between the Inna> and extend the outer wall, each aligned with one of the supports and at its outer edge with the outer wall and at its inner Edge are connected to the inner wall so that the inner wall and the outer wall are reinforced by the beams and the connecting members are. 16. A container according to claim 15, characterized in that each Connecting member at least partially consists of a part which penetrates the inner wall and is formed in one piece with the carrier is. 17. A container according to claim 16, characterized in that the outer part of the connecting member has a flange, as well mechanical means connecting the part penetrating the inner wall to the flange. 18. A container according to claim 17, characterized in that the flange overlaps the part penetrating the inner wall and this and the flange are connected to one another in the overlapping area by the mechanical means. 19. Container in a ship for the transport of liquefied gas, for example methane or the like, approximately below ambient 9098AA / 071 * pressure, wherein the container has an inner wall and an outer wall arranged at a distance from it, with the inner wall a plurality of carriers each having an inner edge spaced inwardly from the inner wall, and each carrier in general is perpendicular to that part of the inner wall to which the carrier is connected, the container and the vehicle being characterized thereby are that a plurality of connecting members are provided, which are in the space between the inner and the outer wall extend, aligned with one of the carriers, and at their outer edge with the outer wall and at their inner edge with the inner wall are connected that tendons are provided, which caused by thermal expansion and shrinkage relative movement between the outer and inner walls prevent each of these tendons in the space between the outer and the Inner wall is arranged, and one arranged between the outer wall and the inner wall at right angles to them, upwardly directed Has web, a box profile support system is provided along side walls of the container, which is a box profile support has, which has a first and a second, planar support plate which are mounted at right angles to each other and form the inside of the box, also another plate with two legs and a rounded corner, these legs are mounted near opposite ends of the first and second planar support plates, so that the closed box section beam is obtained, in the box section girder generally arranged at right angles to him two reinforcement angles and to its reinforcement are connected to it at their edges, several spaced apart on top of the inner hull - 30 - 909844/071 % BAD OFHGiNAU Pillars are mounted, each of which is made of load-bearing insulating material, for example balsa wood or the like, is attached transversely and has a flat upper surface on which Several foundations are mounted on the underside of the tank, each of which is vertically aligned with one of the pillars, each foundation at least has two vertical plates mounted at right angles to each other and a horizontal plate attached to the lower Edge of the two panels is mounted and slidably rests on the top surface of the pillar, on top of the inner hull of the Ship a first insulated U-profile is mounted, which is vertical aligned with the longitudinal center line of the container, a second insulated U-profile mounted on top of the inner hull of the ship that is vertically aligned with the transverse center line of the container, and several wedges are mounted on the container, the extend to below the bottom of the container and are slidably supported by the first and second U-profiles. 90 9.84 4/071 BAD ORiOINAL