DE1292459B - Protection device for tankers for the transport of cryogenic liquids - Google Patents

Description

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The invention relates to a protective device for a giving safety shell or a closed one to provide a tanker for the transport of cryogenic collection containers on the outside Liquids, in particular liquefied gases, can be applied to the thermal insulation layer and from its within a thermal insulation layer to which the leakage fluid if necessary to be given Protection against penetrating heat is pumped out for 5 times. With such a protective loading container with its side walls and direction change even if a leak occurs possibly with its bottom distance from the heat - the temperature conditions within the container insulation layer has, with a device for isolation only insignificant and the ship skonstruk-interception The ion leaking out of the loading container is effectively protected. In addition, the Leakage fluid and with a preferably io heat insulation layer through the leakage fluid The pumping device that starts up automatically is not soaked through. This protective device has jezum Pumping out leakage fluid from the leak but the disadvantage that it is very complex, liquid collecting device. because also the safety shell or the collecting

In the case of tankers for the transport of liquid gases with a container, like the loading container from extremely low temperatures, safety measures must be made from a temperature-resistant material and

took necessary to avoid the sharp temperature changes occurring in the event of container

leaks withstand the leaking liquefied gas with its deep.

Temperature did not directly affect the design of this protective device To get the hull of the ship, as the cryogenic one assumes, among other things, that due to the Liquefied gas leads to its embrittlement and breakage, ao strong movements occurring during sea transport because it is not resistant to low temperatures and stresses on the loading container - the Steels. Only the one with the deeply cold bank can hold up to 40 ° in heavy seas who are in direct contact with each other - a complete enclosure is necessary. Loading containers can withstand the temperatures of as they are made of aluminum, light metal alloys from the ship classification societies and Chromium-nickel- or chromium-manganese steel, supervisory authorities asserted that a liquefied gas loading container was tenitic Steel, copper or its alloy, especially for liquefied methane, from one gen, so from at low temperatures not brittle safety shell must be surrounded in full height. end materials exist. Collecting devices for leakage fluid coming from

The embrittlement of the hull, in particular a fixed storage container for dangerous

its outer skin, can be avoided by leaking liquids, are in the form of the storage

the hull is double-walled, so the container is completely enclosed at a distance

that between the two bowls there is a heating collecting container, only its lower part

medium, e.g. B. water, to maintain a giving drip tray or only at the bottom Can circulate minimum temperature. The 35 connected and surrounding the side walls

Thermal insulation layer for the or the Ladebehäl- collecting channels known. The dimensioning is in

ter is then located within the inner shell, generally made in such a way that the entire storage

within which the loading container is arranged. container content in this and the collecting device

If liquid gas occurs through a leak in the cargo container it can be collected. Depending on the leak and penetrates the thermal insulation layer, so 40 liquid level inside the collecting device

the inner shell is heated to such an extent that, under control of the leakage fluid level,

impermissible embrittlement is prevented. If necessary, these automatically sense pumps in operation

Leakage protection device, can be set for a tanker.

is structurally complex and has the disadvantage that the problem underlying the invention is the insulation layer is completely moistened. Also 45 creating a protective device for one if between the insulation layer and the loading tanker of the type mentioned at the beginning, the same we container a certain distance would be provided, as impressive as those already proposed, but erdaß a collecting space surrounding the container is mainly less complex and therefore cheaper. The problem on which the invention is based is the problem from which leakage fluid is pumped out that could not be completely prevented, in particular for the protective device mentioned at the beginning which solved in the area of the lower part of the loading container that the leakage fluid collecting device erdie Insulation layer is moistened. according to the invention in a heat insulation between it has also already been proposed to leak liquid under the layer and loading container The upper deck of a liquefied gas tanker is provided with an expansion storage area and only one tes sprinkling system to provide that when 55 occurs that part of the thermal insulation layer that the lower of a leak is put into operation, so that the leakage part of the loading container encloses, covering quickly set up a liquid-tight cladding that is closed by icing to form a will. This protective device is in particular known drip tray or collecting channel high loading containers are viewed as not sufficiently safe to which the pumping device is connected. 60 stands.

A likewise not tough to the state of the art.

Lender suggestion therefore provides between the direction is surprising also for tankers with

Thermal insulation layer and the loading container a liquid gas loading container possible, which is heavier

to leave a certain gap, which is greater than the sea slopes up to 40 ° with respect to the perpendicular

known spaces to enable 65. It enables the outer boundary

Thermal expansion and shrinkage is, and constructive in the leak fluid collecting device

It is much easier to collect leakage fluid in the space and therefore at lower cost

direction in the form of a loading container to completely remodel than with an entire enclosure

3 4

of the loading container would be possible. It's just not complicated by this. The insulating layer

less and more expensive low temperature resistant 16 with which the hull 14 is lined

Material for the drip tray or the collecting to achieve a high level of thermal insulation relative

shell required, but it can also be executed thick and consists of a solid and

Support and anchoring of the loading container 5 dimensionally stable insulation material, here balsa wood.

within the thermal insulation and the hull. The loading container is loaded by the

more easily mastered constructively. In addition, the container ceiling 20 needs via the filling line 18 with a valve

no second closed container next to the loading 22, the unloading through one immediately above

container as an extremely high temperature changes of the loading container opening removal line 24 with

removable container to be provided. OK valve 26.

It is sufficient that the cladding that forms the lower quarter of the loading container 10 after the catch tray or collecting channel, only a short F i g. 1, which rests with its bottom 48 on as a carrier 38 pieces above the level of the loading container floor according to schematically indicated supports, is from one above, but it should preferably be surrounded by the drip tray 36, which is through the part of the lower quarter of the height of the Loading container extend, 15 thermal insulation layer 16, which encloses the lower part of the loading container 10 downwards on the outer wall of the loading container, and a liquid-tight lining 30 that covers this drainage is also retained when the tanker is at the stamping point. It is actually also possible that the fen and swaying angular movements up into the Ex side walls of the catching shell in the space 28 zwitremlagen of 40 ° relative to the perpendicular look 20 see insulation layer 16 and loading container 10, so that a Distance between the insulation The cladding should consist of a low-temperature layer and the outer side of the side walls of the material. Apart from the same remains, the covering of the insulating materials as for the loading container is also preferable to the lation layer 16 through the side walls 34 of the wood or plastic, with or without reinforcement, in 25 cladding, because then even with difficult questions, because the Stress, which is mostly at sea, there is no risk of leakage fluid in the cladding supporting the heat insulation layer, the space between the insulation and the side walls being considerably less than that of the loading container. 34 of the drip tray 36 arrives. The bottom 32 of the invention is illustrated in more detail on the basis of schematic drawing. In the purifies. Drip tray 36 from the cladding 30 or the FIG. 1 shows a vertical cross-section through the overlying part of the insulation layer, the loading container of a tanker being provided with a collecting tray with deflector plates or foils for leakage fluid; 2 is similar to FIG. 1, but shows the loading container 35 44 via the connection openings 40 in the collecting device according to FIG. 1 with a collecting channel for leak pan 36 and suction lines 42 into line 46 liquid. pumped, which opens into the filling line 18 or into a line 47 leading to the loading container 10 is to form a leakage board. The pump is automatically put into operation within the liquid collecting space 28 at a distance when leakage liquid has reached the collecting tray 36 in a thermal insulation layer 16 on the inside 40. This is determined by means of a ship structural wall 14, for example electrodes 50 and 52.
Outer skin of a ship or a bulkhead wall, arranged according to the protective device according to the invention, and serves to hold liquefied F i g. 2, the bottom 48 of the loading container 10 rests on natural gas which is to be transported by sea from the extraction location indirectly on the floor 32 'of the cladding 30' which is to be transported to the consumption location. Liquefied 45 insulation layer 16. The side walls 34 'of the Vertes natural gas, which mainly consists of methane, therefore form clothing 30' together with the ground at normal pressure, depending on the proportion of higher boiling 32 ', only one collecting channel 36'. The leakage liquid of the hydrocarbons, a boiling point between -151 and -161 ° C from the collecting channel by means of a deep well and therefore creates a significant potential danger for the ship 50, which is pumped from above in the collecting channel body 10. The loading container is immersed as a pressureless. The pump is designed according to a container and therefore has a venting connection 25 in its loading thermocouple 54 automatically via line 56 in the container ceiling 20, operation set.

due to the penetration of heat. The cladding 30 or 30 'of the insulation layer

55 16 developed by evaporation of the liquid gas 12 can consist of a foil made of metal or plastic

Vapors are withdrawn. The loading container is made.

in relation to the hull of treads, not shown, in a container wall, cracks or others Way supported in such a way that there is temperature change damage, so there is a leak, remains gen can absorb up to approx. 200 ° C. This high the major part of the escaping leakage fluid The temperature difference is due to the fact that the in 60 is in the liquid state, since the below the tropical countries empty loading containers temperatures liquid level parts of the loading containers lying up above 30 ° C, but after filling the walls are not above the boiling point. the with liquid natural gas a temperature of up to escaping leakage liquid runs on the sides approx - 161 ° C. These high temperature walls in the drip tray or the collecting channel differences require special measures for the 6g, and surprisingly also for the Support of the loading container, which is in the area, inclined positions, which the loading container while driving in which he does not take from a catch tray or collecting tanker's. The collected leakage channel is enclosed, and that is the largest area, is expediently removed as soon as possible.

guided. Since leaks cannot always be determined immediately from the outside by the tank crew, it is expedient for the pumping device to be put into operation automatically. For this purpose, the electrodes 50 and 52 (see FIG. 1) or the thermocouple 54 (see FIG. 2) are provided in the lower part of the leakage fluid collecting device. The capacity of the drip tray or Sämmelrinne is then not particularly critical because they also _like when the tanker is on the way for some time before his cargo cleared and the ieckgewordene cargo box can be repaired, not crowded.

Claims (2)

Claims: is 1. Protective device for a tanker for the Transport of very cold liquids, especially liquefied gases, its Lädebehäl- ao arranged within a WäfmeisOiatiönsschicht tef with its side walls and possibly its bottom distance from the heat insulation layer having, with a device for catching the emerging from the loading container Leak fluid and with a pumping device that preferably starts up automatically for pumping out leakage fluid from the leakage fluid collection device, characterized in that that the leak fluid collecting device in an between thermal insulation layer and loading container formed LeckflüSsigkeitSäUffängraum is provided and from only the part of the thermal insulation layer (16) that covers the lower part of the loading container (10) encloses, covering liquid-tight lining (30,30 ') to form a known collecting tray (36) or collecting fin (36 ') to which the pumping device (44, 60) is connected. 2. Protection device according to claim 1, characterized in that the side walls (34, 34 ') of the cladding (30, 30') extend over the lower quarter of the height of the loading container (10). 1 sheet of drawings