DE19931703A1 - Dense and thermally insulating tank integrated into the supporting structure of a ship with improved insulation barrier - Google Patents

Abstract

Dense and thermally insulating tank, which is integrated in the supporting structure of a ship (1, 2), the tank having two successive sealing barriers, the first (17) of which is in contact with the product contained in the tank, and the second (13) of which the primary barrier and the supporting structure is arranged, the two sealing barriers being provided alternately with two thermally insulating barriers, the primary insulating barrier being held elastically in contact with the secondary sealing barrier by metallic fastening devices (12) mechanically connected to the secondary insulating barrier (104) , characterized in that the secondary insulation barrier has a plurality of essentially cuboid elements (104), each of which is formed from a honeycomb cell block (106) which provides high mechanical strength, each block being sandwiched between two plywood panels which cover the floor (5) or the lid (7) of an element of the second ren form insulating barrier, the plates being bonded on its inner surface with the middle block and establish the connection with the support structure (1, 2) and the secondary sealing barrier (13) on their outer side.

Description

The present invention relates to a dense and thermally insulating Tank, in particular for storing liquefied petroleum gas, for example methane a temperature of approximately -160 ° C, with the tank in a support structure of a ship is integrated.

From French patent 2,629,897 is a dense and thermally insulated the tank is known, which is integrated in the support structure of a ship, the Tank has two successive sealing barriers, the first in contact with the product contained in the tank, and the second between the primary lock and the support structure is arranged, the support structure for each tank on the one hand walls that are essentially parallel to the ship's axis run and form the inner walls of the double hull, and on the other hand  has two transverse partitions that are substantially vertical extend to the ship's axis, the two sealing barriers alternating with two thermally insulating barriers are provided. The primary insulation barrier is attached to the secondary seal by means of fastening devices kept essentially linear throughout and mechanical are connected to the secondary insulation lock, the angular connection the primary and secondary blocking elements in the zones in which the querge directed partitions meet the inner panels of the double hull, in shape a connecting ring is made, its structure over the entire butt edge a transverse partition with the inner panel of the double hull in remains essentially constant. Such a tank generally has polyhedra shape, especially the shape of an irregular octahedron whose tankwin kel generally have an opening of 90 ° or 135 °, whereby a Ver binding ring is required, which is appropriate to the different. Angular openings can adjust.

In French Patent 2,629,897 the connecting ring consists of several Ren sheets with variable shapes, such as straight, curved or wink lig. The entirety of these sheets is welded together to form an interior limit lumen with a square cross section, and one side of the Corresponds to the thickness of the primary insulation layer. In the recesses inside of the ring and between the ring and the edge of the tank corner are Isolierma blocks of material used to ensure the continuity of the primary and secondary to ensure insulation barriers. The production of this connecting ring thus requires multiple welding, molding and assembly operations, which makes the Manufacturing becomes complex and expensive.  

In French patent 2,724,623 the connecting ring is with the support structure by welding on anchoring perpendicular to the walls plates connected. The anchor plates are after the application of the Protective paint on the double hull on the inner wall of the double hull welded on. The continuous welding of the anchor plates to the Inner wall of the double hull creates an increased heat flow, which leads to a Impairment of color on the outside of the inside wall of the double lead fuselage and corrode the inner wall of the double fuselage which is in contact with the sea water when the ship is empty and the double hull serves as ballast. To remedy this disadvantage, a new layer of paint on the by continuously welding the anchor Plates affected areas of the double hull applied, however such a new coat of paint offers less effective protection against Corrosion and requires additional work, which increases the manufacturing costs increase.

It is also known that when the ship moves in the swell the Deformation of the connecting ring on the primary and secondary seals lock generates significant tensile loads that add to the tensile loads add which act on these locks when cooling the tank.

In French patent 2 709 725 the connecting ring consists of a sloping band that extends from the abutting edge of the tank corner to Extends joint between the primary and the secondary lock, whereby picking up generated in the primary and secondary sealing barrier Forces in the immediate vicinity of the edge of a tank corner due to the sloping band is possible, on which the composition of the in  the tank wall running parallel to the double hull and that in the parallel forces acting on the partition wall extending forces. One of the like anchoring tape can burn off and extends disadvantageously through the primary insulation barrier to establish a connection between the primary Sealing lock and the secondary sealing lock.

It is the first object of the present invention to provide a tank where the connecting ring at the corners of the tank is a low cost has a simple structure and is easy to assemble. It is according to the invention seen that the improved connecting ring painted the double hull not damaged. Furthermore, the improved connecting ring ensures that continuous tightness of the primary and the secondary barrier as well as the Continuity of thermal insulation; while being a Festig speed that of that of the support structure in the vicinity of the sealing barriers is comparable to the resistance of the sealing locks to impacts increase that due to the rolling and on the walls of the tank The ship swaying caused movement of the liquid during transport be applied.

French patent 2,629,897 suggests the thermal bridge to dispense between the primary sealing barrier and the support structure, whereby a reduction in the thickness and therefore the weight of the primary insulation barrier is possible, so the primary isolation lock because of the reduced weight can be attached directly to the secondary insulation barrier. After this French patent 2 709 725 it is important, with a constant tank wall thickness, the thickness of the secondary insulation barrier to the detriment of the primary insulation barrier to increase, as in the event of a leak in the primary sealing barrier, the undesirable  The farther away from the double hull, the thicker the cold zone secondary lock is. In any case, the thickness of the primary insulation barrier is that Result of a compromise between the thermal insulation function of the primary lock and the need for the primary insulation layer to be a good one Resistance to impacts caused by the liquid during transport should offer.

Furthermore, since the primary insulation barrier is sealed by the primary sealing barrier itself Attachment to the secondary sealing barrier is kept, the primary and the secondary sealing barrier by connecting devices tightly with the secondary ren isolation lock are connected; it is necessary to add a double sliding joint the connecting devices to provide loads under the different expansion of the primary sealing barrier and the secondary sealing to avoid lock. Will only be a sliding joint on the connecting devices provided, the thickness of the connecting devices must be sufficiently large be able to withstand the shear force caused by the lack of sliding joint between the two sealing barriers.

It is the second object of the invention to provide a tank with simplified insulation to create a barrier that has excellent resistance to the Liquid provides shocks applied during transportation, being equal problems of different expansion between the seals locks on the connecting devices are released.

A secondary insulation is known from French patent 2,724,623 to use lock made of a layer of thermally insulating foam system plastic, for example polyurethane foam, is used to reinforce  Kung glass fibers are added to this good mechanical properties to rent.

It is also a secondary isolator from French Patent 2,683,786 known lock, which consists of several boxes, each a cuboid exhibit plywood box, the inside with longitudinal and transverse walls provided and with an insulating, for example known as "pearlite" Particle material is filled.

However, these isolation barriers are complex in structure and cause high ones Manufacturing costs.

It is the third object of the invention to provide a tank with improved insulation lock that has good mechanical properties while he is simple and economical to manufacture at the same time.

According to the invention, a more dense and thermal solution is used to solve the first problem insulating tank provided, which is integrated in the support structure of a ship is, the tank having two successive sealing barriers, the first is in contact with the product contained in the tank, and its secondary between the primary. Lock and the support structure is arranged, the Support structure for each tank on the one hand walls that are essentially parallel to the Ship axis run and form the inner walls of the double hull, and on the other hand, has two transverse partitions, which are essentially Chen extend perpendicular to the ship's axis, with the two sealing barriers are alternately provided with two thermally insulating barriers. The primary insulation barrier is attached to the secondary sealing barrier by Be  Fastening devices kept essentially linear throughout arranged and mechanically connected to the secondary insulation lock, the angular connection of the primary and secondary locking elements in the zones in which the transverse partition walls attach to the inner plates of the Double hull meet in the form of a connecting ring, whose structure over the entire butt edge of a transverse partition with the inside plate of the double hull remains essentially constant. According to the invention each connecting ring has a prefabricated composite carrier made of rigid metallic reinforcement, especially made of stainless steel, is formed in a thermally insulating material, in particular a Polyurethane foam is embedded, the rigid reinforcement being a central one Zone of fixed anchorage essentially at the interface between the Pitch of the connection angle starting from the butt edge and the Extension of the secondary sealing barrier on both sides of the butt edge limited to the mechanical. Connection of the secondary sealing barrier on the central zone of the firm anchorage of the reinforcement, whereby the opposite ends of the reinforcement by fasteners are firmly connected to the support structure, each of which is transverse Partition and an inner plate of the double hull are worn.

The prefabricated composite carrier preferably consists of a plurality of pieces parts that are formed; by using polyurethane or another insulating material injected or into a form in which the reinforcement is arranged in advance is glued to form a foam.

The reinforcement of the composite beam advantageously consists of one me tallband, which extends in the transverse direction and a generally W-shaped  Has profile, the two outer legs on both sides of the abutting edge in the run essentially parallel to the respective supporting walls, the outside leg are firmly connected to the said fasteners, and the two middle legs at the top of said middle Form anchoring zone, the distance between the tip and each The bulkhead corresponds to the thickness of the secondary insulation barrier.

According to the invention, the fastening devices consist of a circumference moderate arrangement of threaded bolts on either side of the Butt edges are welded vertically to each support wall at their base. The local welding of the bolts to the supporting walls generates heat flow that is so slight that there is no impairment of the painting of the double is risked.

According to a preferred embodiment, the prefabricated composite has on its side opposite the inner panel of the double hull several in the transverse direction regularly spaced apart and perpendicular to the transverse partition recesses, and its the Transverse partition opposite side has several in transverse direction regularly spaced from each other and perpendicular to the inner plate of the double hull extending recesses, the recesses by Recesses are formed in the insulating material of the composite carrier, which in the direction of the respective support wall on an outer leg of the W-shaped Reinforcement tape ends, with the outer leg the bottom of each recess fung forms, which has an opening for the passage of a threaded bolt the fastening devices is provided, which corresponds to the recesses are arranged, the reinforcement being screwed onto the bolt by one  en The nut is held firmly on the bolt by this at the bottom of each recess comes to the plant.

Furthermore, the W-shaped reinforcement has reinforcement wings, each of which extend between the adjacent legs of the W, with the wings in parallel planes regularly distributed in the transverse direction and perpendicular to the Walls of the support structure are arranged. Preferably the reinforcements are wing essentially in the middle between two successive out Takes arranged in the transverse direction.

The reinforcement advantageously has an essentially angular shape Anchoring profile, in particular made of stainless steel, on; that in the middle is so welded to the central anchoring zone that the legs of the Angular profile essentially on both sides of the abutting edge extend the secondary seal, the secondary seal the Leg partially covered, so that this by discontinuous welding can be mechanically connected, creating a transverse expansion between the secondary sealing barrier and the anchoring angle profile is possible.

The passage openings for the bolts are essentially U-shaped and Wells have a 45 ° recess near their bottom Direction of the base of the U on to insert the composite beam along the Bisector in a corner of the tank of 90 ° without hindrance from the Allow arrangement of bolts.  

Furthermore, the secondary seal by metal tracks with in the direction of Inside the tank formed curved edges, the metal sheets made of thin sheet formed with a low coefficient of expansion and along with their curved edges welded to the two sides of a welding support are mechanically connected to the elements of the secondary by a sliding joint Insulation lock is held, with the welding bracket part of the fastening device for mechanically holding the primary insulation lock on the se forms a sealing seal. The secondary seal is with the composite Support through secondary sealing linings with the tank interior bent NEN edges connected, the thin sheet linings with little Expansion coefficients exist alongside with their curved edges who are welded to the two sides of a welding support, the curved edges, for example essentially in the manner of a pipe or a wedge, taper increasingly near the composite beam, such that in the proximal area of the liner a straight edge in the extensions one of the curved edges and one on the opposite side edge slightly downward curved overlap is formed by the straight Edge of the neighboring lining essentially in the manner of roof tiles is overlapped, the proximal areas of the linings in the Area of the overlap of each overlap tab are tightly welded, the linings being mechanically aligned with that of the discontinuous Weld are mechanically connected to the anchoring angle profile.

In this case, a substantially angled secondary sealing profile is made Thin sheet with a low expansion coefficient provided, the Schen partially the proximal area of the secondary seal linings cover and are welded to them continuously in the transverse direction  the continuity of the sealing connection of the secondary sealing barrier guarantee.

It is also contemplated that the overlap tabs of the liners partly on one leg of the anchoring profile and partly on one Plywood panel that extends a bridge between the composite beam and the neighboring element forms the secondary insulation barrier and as joints cover for the space between the composite beam and the neighboring element of the secondary insulation barrier is used, the plywood plate is provided with crenellated depressions and the anchoring profile Has recesses for receiving each of the overlap tabs the linings are formed.

Furthermore, the primary seal is through metal tracks to the tank inner curved edges formed, the metal sheets made of thin sheet with a low coefficient of expansion, along with their curved edges welded to both sides of the welding support which is mechanically held by the secondary isolation lock. The primary sealing lock is with the composite beam through primary made of thin sheet metal existing sealing linings with a low coefficient of expansion connected, the edges of which are bent towards the inside of the tank and lengthways ver with the curved edges on both sides of the welding support are welded, with the curved edges of the primary linings increasingly close to the composite beam, for example essentially according to Art a pipe or a wedge, tapered in such a way that in the proximal area of the Lining a straight edge in the extension of one of the curved edges the and on the opposite side edge a slightly downward curved  Overlap tab is formed by the straight edge of the adjacent Lining is substantially overlapped in the manner of roof tiles, the Overlap tabs of the primary linings with the neighboring primary ren linings are welded in the overlap area, the over tabs of the primary linings protrude from the curved edge from partially on the proximal area of the primary liners stretch such that the end portion of the proximal portion is substantially is stepped down like a step, the height of the step being thick corresponds to the primary insulation barrier, and the end region being discontinuous Lich with the proximal area of the secondary lining underneath is welded to mechanically connect them.

In this case, a substantially angled primary sealing profile is made Thin sheet with a low expansion coefficient provided, the Schen partially the proximal area of the primary seal linings cover and are welded to them continuously in the transverse direction to ensure the continuity of the sealing connection of the primary sealing barrier Afford.

The legs of the primary sealing profile advantageously cover one Arrangement of screws that cover the proximal area of the primary Push through clothing to attach it to the primary insulation barrier.

In one design variant, the primary insulation barrier is a shockproof one mechanical protective device replaced, the thermal insulation finally done through the secondary isolation lock. The protective device consists for example of several, essentially cuboid rigid  Plywood sheets with a small thickness, for example in the order of 21 mm, between which the mentioned fastening devices go.

The provision of a non-thermally insulating protective device instead of primary isolation lock allows all problems of different Avoid expansion of the primary and secondary sealing barrier and thus to be able to do without the use of a double sliding joint and any problems of shear when using a simple one Bypass sliding joint as the two sealing locks have the same thermal Have expansion. Thus the protective device is by the primary Sealing barrier itself held in contact with the secondary sealing barrier, the Sealing locks are tightly connected to the same weld carrier.

Furthermore, the secondary barrier layer has a plurality of essentially cuboid shapes ge elements, each formed from an insulating material layer, which sandwiched between two plywood panels covering the floor or form the cover of an element of the secondary isolation barrier, the Panels are glued to the inside with the insulating material layer and over its outside the connection with the supporting structure or the secondary Establish a sealing lock.

Furthermore, the welding support has an arrangement of partially from it Thick punched-out tabs that alternate on either side of the plane of the wearer protrude into recesses in the top of the protector to intervene in the direction and thus temporarily hold the protective device  the secondary seal lock before attaching the primary seal lock cause.

As is known per se, the fastening devices consist of L-profile strips those who have a short and a long side at right angles to each other have, the long side forming the weld carrier and the short side in an inverted T-groove in the thickness of the cover of the elements of the se secondary insulating barrier and supporting the secondary sealing barrier Plate is inserted, the free end of the welding support with respect to primary sealing barrier protrudes towards the inside of the tank.

In a particular embodiment, the layer of insulating material consists of a polyurethane charcoal with a density between 90 and 120 kg / m ³ , preferably about 100 kg / m ³ , in order to ensure the mechanical load-bearing capacity of the sealing barriers exposed to the pressure and the movements of the load.

In addition, the protective device has plywood wedges that go to both Sides of the butt edge of the primary and secondary sealing angle profiles and the step-shaped end regions of the primary sealing linings are ordered.

According to another embodiment, the layer of insulating material consists of secondary isolation barrier from a block with a honeycomb structure, whereby high mechanical strength is achieved.  

The honeycomb cell block advantageously has radiation reflector elements on the at least part of the flat insides of the cells of the honeycomb cover structure, with the radiation reflector elements silvered foils or polished aluminum foils.

From French patent 2 586 082 it is known to arrange the Radiation reflector elements in the volume of the secondary isolation barrier, the Heat radiation losses can be reduced, making the of the secondary lock caused insulation is improved.

Preferably at least some of the walls of the honeycomb cell block are such perforated that a fluid connection between the cells and the outside of the block is guaranteed, and that by the secondary isolation lock volume taken is a low absolute pressure between 0.1 and 300 Millibars, preferably exposed between 2 and 3 millibars. The application a low pressure in the one taken up by the secondary isolation lock Volume enables a significant reduction in heat loss through Convection. The combination of a low pressure with a radiation reflector allows for an optimal reduction of the elements thermal losses.

It is also the low pressure gas that the Volume of the secondary isolation barrier occupies around an inert gas that is satisfied provides insulating properties.

Furthermore, the volume occupied by the secondary isolation barrier permanently connected to an adjustable vacuum pump to keep the pressure in  this volume depending on the desired evaporation of the in liquid gas stored in the tank as fuel for the propulsion of the ship regulate.

Preferably, the vacuum pump is self-regulating, in such a way that it is at one Increase in pressure in volume to a predetermined pressure threshold, for example about 7 millibars starts to work and when one reaches predetermined lower pressure threshold value, for example approximately 2 to 3 Millibar, stop working.

The honeycomb cell block is advantageously made of a folded cardboard web educated.

According to a special embodiment, the tank has devices for Attach the secondary insulation barrier to the support structure, taking this Fastening devices substantially perpendicular to the inner walls of the Support structure welded bolts, each at the free end Have threads, the relative arrangement of the bolts and the elements te the secondary isolation lock to each other is such that the bolts are right-angled lig to the two opposite peripheral edges of the bottom plate of the Elements of the secondary isolation lock are arranged, one exception tion in the plate forming the cover of the element and by the thickness of the Honeycomb cell blocks are provided perpendicular to each bolt, the Bottom of the recess is formed by the bottom plate, which has an opening for the passage of a bolt, one being arranged on the bolt Nete disc rests on the bottom of the recess and by one on the bolt screwed nut is held to fasten the element of the  to effect secondary insulation lock on the support structure. Preferably each recess after attaching the secondary insulation barrier closed the support structure with a thermally insulating plug, wherein the joints existing between the elements of the secondary insulation barrier can also be filled with a thermally insulating material.

The plate forming the cover preferably has two parallel grooves that each take up a welding beam and from each other by a distance are removed, which corresponds to the width of a metal track, the mean area of the plates forming the cover of two adjacent elements in each case is covered by a metal sheet while another metal sheet is the same Width creates the connection between the two metal tracks mentioned.

The second problem is solved by a sealed and thermally insulating tank provided, which is integrated into the support structure of a ship, the tank has two successive sealing barriers, the first of which is in contact with the product contained in the tank, and the second between the primary Ren sealing lock and the support structure is arranged, one thermally insulating secondary barrier between the secondary sealing barrier and the Walls of the support structure is arranged. According to the invention, the tank has a impact-resistant mechanical protection device, which is between the two sealing lock is arranged, the protective device by mechanically with the secondary insulation lock connected metallic fasteners is held elastically in contact with the secondary sealing barrier; being the thermal insulation is guaranteed solely by the secondary insulating layer.  

Advantageously, the secondary seal by metal tracks with in Formed towards the inside of the tank curved edges, the metal sheets made of thin sheet with a low expansion coefficient and alongside with their curved edges on either side of a sweat are welded to the carrier, which is mechanically connected to the elemen by means of a sliding joint th of the secondary insulation lock is held, the weld carrier one Part of the fastening device for mechanically holding the protection direction forms at the secondary sealing barrier.

The protective device advantageously consists of several, essentially cuboid rigid plywood panels with a small thickness, for example in of the order of 21 mm, between which the said attachment go through facilities.

The fastening devices are preferably L-shaped strips, each have a short and a long side at right angles to each other, where the long side forms the welding support and the short side in an inverted T-slot in the thickness of the cover of the elements of the secondary insulation lock forming and the secondary sealing barrier supporting plate is used, wherein the free end of the weld backing with respect to the primary sealing barrier in Rich the interior of the tank protrudes.

Furthermore, the secondary barrier layer has a plurality of essentially cuboid shapes ge elements, which are each formed from an insulating material layer, which is sandwiched between two plywood panels that the Form the bottom or the cover of an element of the secondary insulation barrier, the plates being glued to the inside of the insulating material layer  are and via their outside the connection with the support structure or Establish secondary sealing barrier.

In a known manner, the primary seal by metal tracks with Inside the tank formed curved edges, the metal sheets made of thin sheet with a low coefficient of expansion, along with their curved edges welded to both sides of the welding support which is held directly by the secondary isolation lock.

The welding support advantageously has an arrangement of partially the thickness of punched tabs on; which alternate on both sides of the Level of the carrier in recesses in the top of the peripheral edge of the Protective device are bent and thus a temporary holding of the protective device Direction on the secondary seal barrier before attaching the primary Effect sealing barrier.

The protective device is advantageously in through the primary seal Facility held at the secondary sealing barrier, the primary and the secondary sealing lock sealingly connected to the fastening devices are.

Furthermore, the insulating material layer is a polyurethane foam with a density between 90 and 120 kg / m ³ , preferably approximately 100 kg / m ³ .

According to another variant, the insulating material layer consists of a Honeycomb cell block that gives high mechanical strength.  

The honeycomb cell block advantageously has radiation reflector elements on the at least part of the flat insides of the cells of the honeycomb cover structure, with the radiation reflector elements silvered foils or polished aluminum foils.

Preferably at least some of the walls of the honeycomb cell block are such perforated that a fluid connection between the cells and the outside of the block is guaranteed, and that by the secondary isolation lock volume taken is a low absolute pressure between 0.1 and 300 Millibars, preferably exposed between 2 and 3 millibars.

The honeycomb cell block is advantageously made of a folded cardboard web educated.

According to a special embodiment, the tank has devices for Attach the secondary insulation barrier to the support structure, taking this Fastening devices substantially perpendicular to the inner walls of the Support structure welded bolts, each at the free end Have threads, the relative arrangement of the bolts and the elements te the secondary isolation lock to each other is such that the bolts are right-angled lig to the two opposite peripheral edges of the bottom plate of the Elements of the secondary isolation lock are arranged, one exception tion in the plate forming the cover of the element and by the thickness of the Honeycomb cell blocks are provided perpendicular to each bolt, the Bottom of the recess is formed by the bottom plate, which has an opening for the passage of a bolt, one being arranged on the bolt Nete disc rests on the bottom of the recess and by one on the bolt  screwed nut is held to fasten the element of the to effect secondary insulation lock on the support structure.

The plate forming the cover preferably has two parallel grooves that each take up a welding beam and from each other by a distance are removed, which corresponds to the width of a metal track, the mean area of the plates forming the cover of two adjacent elements in each case is covered by a metal sheet while another metal sheet is the same Width creates the connection between the two metal tracks mentioned.

The third problem is solved by a sealed and thermally insulating tank provided, which is integrated in the support structure of a ship, the tank has two successive sealing barriers, the first in contact with the product contained in the tank, and the second between the primary ren lock and the support structure is arranged, the support structure for each On the one hand, tank walls that run essentially parallel to the ship's axis and form the inner walls of the double hull, and on the other hand two across has dividing walls which are substantially perpendicular to Extend the ship's axis, the two sealing barriers alternating with two Thermally isolating locks are provided, the primary isolating lock in attachment to the secondary sealing barrier by fastening devices is held, which is arranged essentially continuously linear and mecha are connected to the secondary isolation lock. According to the invention the secondary insulation barrier several essentially cuboid elements on, each from a high mechanical strength imparting Wa benzellenblock are formed, each block sandwiched between two Plywood panels are arranged covering the bottom or the lid of an element  form the secondary insulation barrier, with the panels on the inside with are glued to the middle block and the connection with the outside the supporting structure or the secondary sealing barrier.

Advantageously, the secondary seal by metal tracks with in Formed towards the inside of the tank curved edges, the metal sheets made of thin sheet with a low expansion coefficient and alongside with their curved edges on either side of a sweat are welded to the carrier, which is mechanically connected to the elemen by means of a sliding joint th of the secondary insulation lock is held, the weld carrier one Part of the fastening device for mechanically holding the primary Insulating barrier forms on the secondary sealing barrier.

The honeycomb cell block advantageously has radiation reflector elements on the at least part of the flat insides of the cells of the honeycomb cover structure, with the radiation reflector elements silvered foils or polished aluminum foils.

Preferably at least some of the walls of the honeycomb cell block are such perforated that a fluid connection between the cells and the outside of the block is guaranteed, and that by the secondary isolation lock volume taken is a low absolute pressure between 0.1 and 300 Millibars, preferably exposed between 2 and 3 millibars.

It is also the low pressure gas that the Volume of the secondary isolation barrier occupies around an inert gas that is satisfied provides insulating properties.  

Furthermore, the volume occupied by the secondary isolation barrier permanently connected to an adjustable vacuum pump to keep the pressure in this volume depending on the desired evaporation of the in liquid gas stored in the tank as fuel for the propulsion of the ship regulate.

Preferably, the vacuum pump is self-regulating, in such a way that it is at one Increase in pressure in volume to a predetermined pressure threshold, for example about 7 millibars starts to work and when one reaches predetermined lower pressure threshold value, for example approximately 2 to 3 Millibar, stop working.

The honeycomb cell block is advantageously made of a folded cardboard web educated.

According to a special embodiment, the tank has devices for Attach the secondary insulation barrier to the support structure, taking this Fastening devices substantially perpendicular to the inner walls of the Support structure welded bolts, each at the free end Have threads; the relative arrangement of the bolts and the elements te the secondary isolation lock to each other is such that the bolts are right-angled lig to the two opposite peripheral edges of the bottom plate of the Elements of the secondary isolation lock are arranged, one exception tion in the plate forming the cover of the element and by the thickness of the Honeycomb cell blocks are provided perpendicular to each bolt, the Bottom of the recess is formed by the bottom plate, which has an opening for the passage of a bolt, one being arranged on the bolt  Nete disc rests on the bottom of the recess and by one on the bolt screwed nut is held to fasten the element of the to effect secondary insulation lock on the support structure. Preferably each recess after attaching the secondary insulation barrier closed the support structure with a thermally insulating plug, wherein the joints existing between the elements of the secondary insulation barrier can also be filled with a thermally insulating material.

The plate forming the cover preferably has two parallel grooves that each take up a welding beam and from each other by a distance are removed, which corresponds to the width of a metal track, the mean area of the plates forming the cover of two adjacent elements in each case is covered by a metal sheet while another metal sheet is the same Width creates the connection between the two metal tracks mentioned.

In one variant, the primary insulation barrier is through a shockproof mechanical Protective device replaced, the thermal insulation only by the secondary isolation lock is done.

For a better understanding of the invention are considered to be non-limiting Examples below include various embodiments of the invention Described with reference to the accompanying drawings.

Show it:  

Fig. 1 is a partial view of a corner of a tank according to the invention according to the first object of the invention in section along a plane perpendicular to the apex of the dihedron formed by the corner plane;

Fig. 2 is a perspective view of the prefabricated composite carrier of Figure 1, which is used for connection at a corner of the tank.

. Fig. 3 is an enlarged view of the circled in Figure 2 in details III;

Figure 4 is a partial view of an embodiment according to the second task of the invention in section along a transverse plane that is perpendicular to the double hull of the ship.

FIG. 5 is an enlarged perspective partial view of the one in FIG. 4. provided sweat carrier;

FIG. 6 shows a plan view of a secondary sealing lining in the expanded state, for connecting the secondary sealing barrier to the composite carrier, as shown in FIG. 1;

FIG. 7 is a partial perspective view of the secondary sealing linings of FIG. 6 in the assembled state;

FIG. 8 is an enlarged partial view in section along the line VII-VII of FIG. 7, the connection zone between two adjacent linings being shown above the anchoring profile of the composite beam;

Fig. 9 is an enlarged partial view in section along the line IX-IX of Figure 7, showing the connection zone between two adjacent linings gene over a plywood board, which serves as a joint cover between the composite beam and an adjacent element of the secondary insulating layer.

Fig. 10 is a partial perspective view of the plate shown in Fig. 9;

Fig. 11 is a partial perspective view of the anchoring profile of Fig. 8;

Fig. 12 is a plan view of a primary sealing liner in the expanded state, for connection between a primary sealing barrier and the United composite carrier, as shown in Fig. 1;

FIG. 13 is a partial perspective view of the liners according to Fig 12 in the assembled state.

FIG. 14 is an enlarged partial view in section along the line XIV-XIV of FIG. 13;

FIG. 15 is an exploded perspective view of an exemplary embodiment of the secondary insulating barrier game according to the third object of the invention;

Fig. 16 is a perspective view of the element according to Fig. 15 in the assembled state, and

Figs. 17 to 19 are enlarged views of the encircled detail of the Fig. 16 according to arrows XVII, XVIII and XIX.

Fig. 1 shows a corner of the tank according to the invention, which is integrated into the support structure, one wall being formed by the inner plate 1 of the double hull of a ship and another wall being formed by a transverse partition 2 of a double partition, which serves as a partition between serves two tanks. The supporting walls 1 and 2 form an angle of 90 ° with one another and a butt edge 3 . The transverse walls are attached to the double hull by welding.

The tank according to the invention has a secondary insulation lock fastened to the supporting structure of the ship. The secondary insulation barrier consists of several rectangular cuboid elements 4 , which are arranged adjacent to one another and essentially cover the entire inner surface of the support structure. Each element 4 consists of a first plywood plate 5 , which forms the bottom of the element 4 , with a thick layer of thermal insulating material 6 lying on the base plate 5 , which is glued to the inside of the plate 5 . A second plywood panel 7 is glued to the thermally insulating layer 6 and forms the cover of the element 4 . As can be seen in Fig. 4, a glass fiber fabric 8 between the layer 6 and the cover plate 7 can be arranged. This fabric 8 can be provided to give the thermally insulating layer 6 additional good mechanical properties. The layer 6 can be formed from an alveolar plastic material, for example from polyurethane foam. Of course, several glass fiber fabrics can be arranged in the thickness of the layer 6 , as described in more detail in French Patent 2,724,623. Although this is not shown in the figures, it is known for attaching the elements 4 to the support structure to provide regularly distributed recesses over the circumference of the element 4 , which are cylindrical recesses through the cover plate 7 and the thickness of the layer 6 through to the bottom plate 5 are formed. The bottom of a depression is thus formed by the rigid base plate 5 of the element 4 . The bottom of the recess is perforated to form an opening, the diameter of which is dimensioned for the passage of a bolt. These bolts are welded to the inside of the support structure perpendicular to it and have a free thread end. The bolts are arranged along lines which extend parallel to the edge 3 , which is formed by the abutment of the two supporting walls 1 and 2 . Of course, the bolts and the depressions are arranged such that when an element 4 is attached to the supporting wall, the element 4 can be positioned relative to the wall in such a way that a bolt is located opposite a recess.

It is known that the walls 1 and 2 of a ship are at a distance from the theoretical surface of the support structure, which can be explained by manufacturing inaccuracies. In a known manner, these distances are compensated for by connecting the base plates 5 to the supporting structure via beads 9 made of polymerizable resin (see FIG. 1), which, starting from an imperfect supporting structure surface, enable a covering made of neighboring elements 4 to form, the cover plates 7 , which in their entirety form a surface deviating practically from the desired theoretical surface. The resin beads 9 are arranged parallel to the abutting edge 3 at a mutual distance. Each element 4 is pressed in the direction of the support structure until (not shown) wedges with predetermined dimensions, which are arranged, for example, at the four corners of the base plate 5 , rest against the support structure. In this position, the polymerizable resin beads 9 are more or less compressed and this method enables the compensation of errors of the supporting wall with respect to the theoretical surface in the static state. The dimensions of the wedges are calculated after a precise positioning of the spatial positioning of the inside of the supporting wall.

When an element is correctly positioned, the element 4 is fastened by means of the bolts which penetrate through the openings into the recesses of the element 4 , the fastening being carried out by the threaded end of the. Bolt a washer and a (not shown) tightening nut to be arranged. The disc is pressed by the nut against the bottom of the recess such that each element 4 is attached to the support structure at several points distributed over the edge of the base plate 5 , which is advantageous from a mechanical point of view.

The polymerizable beads 9 harden after a few hours by polymerization, whereby the wedges can then be removed. Before pressing on the elements 4 on the support structure, a film (not shown) made of polyane or another material can be arranged between this and the beads 9 in order to prevent the resin of the bead from sticking to the support wall, and so on to allow a dynamic deformation of the supporting wall without the element 4 being exposed to the forces generated by the deformation between the devices for fastening the elements 4 to the supporting structure.

After fastening, the depressions are closed by using plugs (not shown) made of thermally insulating material, which are aligned with the cover plate 7 of the element 4 .

Furthermore, a thermally insulating material, for example a flexible insulating material 10, is arranged in the joint regions that separate two elements 4 . The general structure of the recesses for attachment to the bolts can be of the type described in French Pat. No. 2,724,623.

According to a variant, the secondary isolation lock can consist of several boxes exist as described in European Patent 4,543,686, which by reference is part of the present application. These boxes are best hen generally from a cuboid box made of plywood, in which longitudinal and transverse partition walls are provided, the interior of the Box is filled with an insulating particle material, for example "pearlite". The The boxes are attached to the supporting structure using right-angled bends Metal ashes on the peripheral edge of the base of the box.

At least one groove 11 is formed in the upper side of the cover plate 7 of an element 4 and extends in the longitudinal direction of the ship, that is to say perpendicular to the beads 9 . The grooves 11 have a cross-section which is essentially in the form of an inverted T, the horizontal line of the T extending continuously in the thickness of the plate 7 , while the spread of the T protrudes from the outside of the plate 7 into the tank interior. In each groove 11 Be a fastening device is provided, which makes it possible to hold on the secondary insulating lock on the one hand a secondary sealing lock and on the other hand a primary sealing lock, which will be described below. Be the fastening device is formed by an L-shaped curved welding flange 12 , the short leg 12 a of the L is slidably inserted into one of the branches of the crossbar of the T-groove 11 , while the long leg 12 b of the L by the spread of the T-groove 11 and extends over the primary sealing barrier into the interior of the tank. The welding flange 12 is formed by an Invar plate, which forms a sliding joint at the connection point with the plate 7 . The long leg 12 b of the L-shaped welding flange 12 forms a welding support for connection to the primary sealing lock and the secondary sealing lock, as explained below.

As shown in Fig. 5, the welding support 12 b has substantially in the middle of its height a plurality of punched-outs 14 which form fastening tabs 15 , which are partially punched out of the thickness of the welding flange and are bent essentially at right angles to the plane of the welding support 12 b. Preferably, the fastening tabs 15 are alternately bent on one or the other side of the plane of the welding support, and are arranged substantially flush with one another, so that they extend over the upper edge of the curved edges 13 a of the metal tracks 13 , as in FIG. 4 shown.

As soon as the secondary sealing barrier is formed, 12 b plywood panels 16 with a thickness of 21 mm are arranged between the welding supports. These panels 16 rest on the metal sheets 13 of the secondary sealing barrier and have in their top two receptacles 16 a, which extend along the edges against the welding supports 12 b, which makes it possible to bend the fastening tabs 15 into these mouth frames , so that loosening of the panels 16 is prevented from the secondary sealing lock carrying them, and whereby it is possible to attach the primary sealing lock for final fastening of the same. The panels 16 form a shockproof mechanical protection device which replaces the generally provided primary insulating barrier, the thermal insulation being effected exclusively by the secondary insulating barrier.

The primary sealing barrier consists of metal sheets 17 made of Invar sheets with curved edges 17 a and a thickness of approximately 0.5 mm. The width of the metal sheets 17 is approximately 50 mm, such that the curved edges 17 a abut on both sides of the welding support 12 b; In this way, a tight weld between the edges 17 a and the welding support 12 b can be created in a known manner by means of an automatic machine, as was done previously in the case of the edges 13 a and the welding support 12 b. With 18 the continuous welding of the curved edges 17 a on the welding support 12 b in Fig. 4 is designated.

As shown in FIG. 4, the upper edge of the welding support 12 b extends beyond the curved edges 17 a to the inside of the tank and the fastening tabs 15 extend under the metal tracks 17 .

The following describes the configuration of the connecting ring which is arranged between the tank wall 1 , which extends along the double hull of the ship, and the tank wall 2 , which extends along a transverse wall of the ship. The connecting ring consists of a prefabricated United bundle carrier 20 with a rigid metal reinforcement 21 , for example made of stainless steel, which is embedded in a thermally insulating material 22 , for example polyurethane foam. This carrier 20 has the shape of a symmetrical prism with respect to an bisector of the angle formed between the supporting walls 1 and 2 of the ship 3 . The bases of the prism 20 are perpendicular to the walls 1 and 2 . The carrier 20 has a structure which remains substantially constant over the extent of the abutting edge 3 of the tank corner. When the reinforcement 21 is a metal band which is bent to a substantially W-shaped profile, the two outer legs 23 extend parallel to the supporting walls on both sides of the abutting edge. 3 The outer legs 23 of the W are not covered by thermally insulating material on their outside aligned with the outside of the rest of the carrier.

Recesses 24 are formed perpendicular to each outer leg 23 and extend through the thickness of the insulating material 22 of the carrier 20 . The depressions 24 are arranged at a regular distance from one another along the abutting edge 3 , as shown in FIG. 2. The depressions 24 are open to the outside of the carrier 20 , which lies opposite the adjacent element 4 of the secondary insulation barrier. The depressions have a substantially U-shaped cross section. The bottom of the recesses 24 is formed by the outer leg 23 of the reinforcement 21 , wherein in the outer leg 23 a U-shaped opening is formed at right angles to each recess 24 in order to allow the passage of a threaded bolt 26 . The bolts 26 are welded at their base on both sides of the abutting edge 3 perpendicularly to each supporting wall in the transverse direction of the ship in the manner of the threaded bolts for the attachment of the secondary insulation lock. A nut 27 is attached to the free threaded end of the bolt 26 and is supported on the bottom of the recess 24 for fastening the reinforcement 21 and thus the support 20 of the support structure. As can be seen better in FIG. 1, each recess 24 has an undercut 24 a of substantially 45 ° in the vicinity of its base in order to enable the composite carrier 20 to be inserted into a corner of the tank without being obstructed by the bolt arrangements 26 .

Polymerizable resin beads 9 can be provided between the walls of the support structure and the opposite surfaces of the composite support 20 , as was already the case with the secondary insulation barrier.

The two middle legs 28 of the W-shaped reinforcement form at their common tip 29 an anchoring area with a strength that is comparable to that of the supporting structure of the ship. An anchoring profile 30 , for example made of stainless steel, is welded to this tip 29 and has the shape of a right angle, the two legs of which extend on both sides of the abutting edge 3 essentially in the direction of the secondary sealing lock. This anchoring profile 30 serves to effect the mechanical connection with the secondary sealing barrier, as explained below. Between the two central legs 28 of the W-shaped reinforcement, a plurality of reinforcing wings 31 are arranged, which are essentially trapezoidal and extend in planes perpendicular to the supporting walls 1 and 2 . In the extension of each trapezoidal reinforcement wing 31 , two further triangular wings 32 are welded between each middle leg 28 and the neigh disclosed outer leg 23 of the reinforcement 21 . The wings 31 and 32 are embedded in the thermally insulating material 22 of the composite carrier 20 and are provided essentially in the middle between two depressions 24 .

The reinforcement 21 delimits a fastening ring in the corner of the tank with the walls 1 and 2 .

In the extension of each leg of the anchoring profile 30 , a recess 33 is formed in the outer surface of the insulating material 22 , which is directed towards the interior of the tank. The tip of the depressions 24 ends in this depression 33 . The adjacent element 4 of the secondary insulating lock has a cover plate 7 , which is interrupted in the vicinity of the composite carrier 20 such that a free space is formed opposite the recess 33 of the United carrier 20 . A plywood panel 34 serving as a joint cover can thus be arranged between the composite carrier 20 and the adjacent element 4 , which lies in each case on the depression 33 and the free space of the adjacent element 4 . The mat 34 covers the space between the composite carrier 20 and the adjacent element 4 , this space being filled with a soft, thermally insulating material 10 , as previously mentioned.

The connection of the primary sealing barrier and the secondary sealing barrier to the composite carrier 20 is carried out by means of special metal tracks, which are referred to below as linings.

As can be seen from FIGS . 6 to 11, the secondary sealing linings 113 differ from the metal sheets of the secondary sealing barrier in that the curved edges 113 a only extend over part of the length of the linings 113 , with each curved edge 113 a in near the composite beam increasingly tapered like a pipe or wedge. The inclined edges 113 b of the curved edges 113 a end at a certain distance from the proximal edge of the lining 113 . In the extension of one of the curved edges 113 a, the liner 113 has a straight edge 114 in the proximal region, while in the extension of the other curved edge 113 a an overlap flap 115 is provided, which is bent slightly downwards to over from the straight Edge 114 of the adjacent lining to be overlaid in the manner of bricks. A continuous weld is provided between the straight edge 114 of a lining 113 and the underlying overlap tab 115 of an adjacent lining 113 in order to ensure a continuous tightness at the secondary sealing barrier, as can be seen from FIGS . 8 and 9. The overlap tabs 115 of the secondary sealing linings 113 extend partially on the joint cover plate 34 and one leg of the anchoring profile 30th The plate 34 has on the top crenellated recesses conditions 34 a, which extend parallel to the curved edges 113 a and accommodate the overlap tabs 115 , as shown in FIGS. 9 and 10. In the extension of certain crenellations 34 a of the plate 34 , recesses 30 a are formed in the legs of the angular profile 30 , which likewise accommodate the overlap tabs 115 , as shown in FIGS. 8 and 11.

The overlap tabs 115 allow the weld to be supported with the straight edge 114 of the adjacent liner.

The proximal region of the secondary sealing liner 113 is discontinuously welded to one leg of the anchoring profile 30 in order to ensure the mechanical connection, while at the same time a transverse expansion between the secondary sealing liner and the anchoring profile remains possible.

The continuous tight connection of the secondary sealing lock at the corner connection is ensured by a secondary sealing angle profile 35 , for example from Invar, with a right-angled profile, the two legs of which each overlap the proximal area of the secondary sealing linings on both sides of the abutting edge 3 , the secondary sealing profile 35 is continuously welded to the secondary sealing linings for sealing. In this way, the functions of sealing and anchoring the secondary sealing lock on the composite carrier are separated.

The W-shaped reinforcement 21 of the composite beam 20 has a thickness of approximately 8 mm, the anchoring profile 30 has a thickness of approximately 6 mm and each leg of the profile has a width of 60 mm. The unit length of a composite beam is approximately 1 m, with a distance of 200 mm between each well, the outer wells being about 100 mm from the edge of the beam. The reinforcement wings together form an oblique band which runs perpendicular to the bisector of the corner of the tank, the wings having a thickness of approximately 8 mm with a total length in the oblique direction of approximately 80 mm. For a carrier with a length of approximately 1 m, the number of depressions is advantageously 5, these depressions being used to receive bolts which have a diameter of 18 mm. The plate 34 has a thickness of 12 mm, like the cover plate 7 of the elements of the secondary insulation barrier, and the crenellations 34 a in the plate 34 are provided every 10 mm with a width of 10 mm and a depth of 3 mm, while the Recesses 30 a of the anchoring profile 30 are formed approximately every 500 mm with a width of approximately 10 mm and a depth of 2 to 3 mm. The overlap tabs 115 of the secondary sealing linings can have a length of 100 mm, a width of 10 mm and a thickness of 1.5 mm in the case of a secondary sealing lining with a length of 400 mm and a width of 540 mm in the expanded state.

Since the crenellations 34 are formed a mm at regular intervals of 10, only accept every 500 mm at the interface between two secondary linings 113 Peaks located overlapping tabs 115 of the se ondary sealing liners 113.

The primary sealing linings 117 are described below with reference to FIGS . 12 to 14, which differ from the metal sheets 17 of the primary sealing barrier in that the curved edges 117 a increasingly taper in the vicinity of the composite carrier. The bevelled or wedge-shaped bevelled edges 117 b of the curved edges 117 a end at a distance from the proximal edge of the primary sealing lining 117 . One of the curved edges 117 a is extended by a straight edge 118 , while the other curved edge 117 a is extended by an overlap flap 119 with a length of approximately 50 mm and a width of 10 mm with a thickness of 1.5 mm. For comparison: the height of the curved edges is 20 mm. The overlapping flaps 119 extending in contrast to the overlapping lugs 115 of the secondary Dichtaus clothing 113 partially in the direction of the composite beam and are defined exclusively in the plane of the primary sealing barrier. The end region of the primary sealing lining 117 , which is located beyond the overlap flap 119, has straight side edges, and this end region is essentially stepped in a step-like manner at a height which corresponds to the thickness of the panel 16 of the mechanical protective device. The stair tread area has an area 120 which is inclined in the direction of the abutting edge 3 and ends in a tab 121 which is discontinuously welded to the proximal area of the secondary sealing lining 113 , as shown in FIG. 1. The discontinuous welding of the tab 121 with the secondary lining 113 causes the mechanical connection. A plurality of holes 122 are formed through the primary liner 117 in an arrangement transverse to the overlap tab 119 in the primary liner 117 . These holes 122 , for example 5 in number, serve to receive fastening screws 123 for fastening the proximal region of the primary lining on a panel 16 of the mechanical protective device. The panel 16 , which supports the primary sealing liner 117 , has an inclined surface 16 b which is designed corresponding to the inclined region 120 of the liner 117 .

With the overlap tabs 119 of the primary sealing lining 117, it is not necessary to provide recesses in the panels 16 of the protective device, since these overlap tabs 119 are arranged at the interface between two panels 16 .

As can be seen in Fig. 4, the panels 16 of the protective device are smaller than the primary and secondary sealing metal sheets, which makes it possible to use the overlap tabs 119 in the space between two adjacent panels of the protective device.

An essentially rectangular primary sealing profile 36 from Invar ensures the tight connection of the primary sealing barrier at the corner of the tank. The two legs of the primary sealing profile 36 each extend in the plane of the primary sealing barrier on both sides of the abutting edge 3 and cover the openings 122 of the primary sealing lining 122 , which can otherwise represent a leak in the tightness of the primary sealing barrier. The legs of the primary sealing profile 36 are continuously welded beyond the openings 122 to the primary linings 117 . The dimensions of the primary sealing profile 36 are larger than the dimensions of the second sealing profile 35 , as can be seen from FIG. 1. This means that the functions of sealing and anchoring the primary sealing barrier to the composite beam are separate.

In the space between the two sealing profiles 35 and 36 and the oblique areas of the primary linings 117 , two rectangular wedges 37 are used with oblique edges, which consist of plywood and ensure the continuity of the protective device.

In the following, with reference to FIGS. 15 to 19, a guide variant from the secondary isolation lock is described.

Like the elements 4, each element 14 of the secondary insulating barrier consists of a plywood base plate 5 with a thickness of 9 mm, a cover plate 7 made of plywood with a thickness of 12 mm and an intermediate layer of insulating material 106 , which in the present case consists of a honeycomb block . The total thickness of the element 104 is, for example, approximately 270 mm, the width is 1 m and the length is 3 m.

The honeycomb cell block 106 is preferably produced by folding a cardboard web and the cells are designed as hexagonal meshes of 20 mm by 20 mm.

The side faces of the cells of the block 106 are penetrated by holes 107 with a diameter of approximately 3 mm, the holes 107 being formed every 30 mm in the direction of the thickness of the block 106 .

Holes 107 in block 106 allow for the generation of negative pressure in the volume occupied by the secondary insulation barrier, for example by pumping the air in volume to a reduced pressure of approximately 2 millibars. The holes 107 thus allow air to be drawn from the elements 104 .

At each longitudinal edge of an element 104 , several recesses 108 are seen, for example four, which extend through the cover plate 7 and the thickness of the block 106 , the base plate 5 forming the bottom of the recess 108 . An opening 109 is formed in the base plate 5 at right angles to each recess 108 in order to pass a threaded bolt through it, as was described above in connection with the elements 4 .

Before folding into the honeycomb cell structure, the carton used to form block 106 may be coated with a silver-plated or polished aluminum foil or other radiation reflector material to reduce heat radiation losses.

As shown in FIG. 16, the top of the cover plate 7 has two longitudinal grooves spaced apart by approximately 500 mm, which are arranged symmetrically to the center of the plate and receive two welding support legs 12 , between which a metal sheet 13 or a secondary sealing lining 113 the secondary isolation lock is arranged. Since the width of an element 104 is approximately 1 m, a metal web 13 of 500 mm can be arranged over two adjacent elements 104 , these being welded with their curved edges 13 a to a welding support leg 12 of each element 104 .

Fig. 1 shows that the composite beam 20 has an inclined surface 39 , dic extends perpendicular to the bisector of the corner of the tank and a drainage space 40 with a substantially triangular cross section near the impact edge 3 forms.

Since the primary sealing block and the secondary sealing block are not thermally insulated from one another, because the interposed protective device only provides shock protection, there is no risk that the primary sealing linings 117 will bend up in their oblique region 120 , since there is practically no contraction difference between the two sealing blocks.

Due to the presence of the shock absorbing device, the tightness of the tank is not affected by impact waves in the tank if the Tank is not completely, but is filled to less than 80%, for example.

Claims (12)

1.Tight and thermally insulating tank which is integrated in the supporting structure of a ship ( 1 , 2 ), the tank having two successive sealing barriers, the first ( 17 ) of which is in contact with the product contained in the tank, and the second ( 13 ) is arranged between the primary barrier and the supporting structure, the two sealing barriers being provided alternately with two thermally insulating barriers, the primary insulating barrier being in contact with the secondary sealing barrier by metallic fastening devices ( 12 ) mechanically connected to the secondary insulating barrier ( 104 ) ) is held elastically, characterized in that the secondary insulation barrier has a plurality of substantially cuboid elements ( 104 ), each of which is formed from a high mechanical strength honeycomb cell block ( 106 ), each block being sandwiched between two plywood panels, which the Bottom ( 5 ) or cover ( 7 ) form an element of the secondary insulation barrier, the plates being glued on the inside to the middle block and establishing the connection to the supporting structure ( 1 , 2 ) or the secondary sealing barrier ( 13 ) via their outside. 2. Tank according to claim 1, characterized in that the secondary sealing barrier is formed by metal tracks ( 13 ) with edges bent in the direction of the tank interior ( 13 a), the metal tracks being formed from thin sheet metal with a small expansion coefficient and along the sides with their curved edges are welded to the two sides of a welding support ( 12 b) which is held mechanically by a sliding joint on the elements ( 4 , 104 ) of the secondary insulation lock, the welding support being part of the fastening device ( 12 ) for mechanically holding the protective device ( 16 ) on the secondary sealing block ( 13 ). 3. Tank according to claim 2, characterized in that the cover ( 7 ) forming plate has two parallel grooves ( 11 ), each receiving a welding carrier ( 12 b) and are apart from each other by a distance which is the width of a metal sheet ( 13 ), the central region of the plates forming the cover of two adjacent elements ( 4 , 104 ) each being covered by a metal sheet, while another metal sheet of the same width establishes the connection between the two metal sheets mentioned. Protective device ( 16 ) made of several, essentially cuboid rigid plywood panels ( 16 ) with a small thickness; for example in the order of 21 mm, between which the fastening devices ( 12 ) pass. 4. Tank according to one of claims 1 to 3, characterized in that the tank has means for attaching the secondary insulating lock ( 104 ) to the support structure ( 1 , 2 ), said attachment means having bolts welded substantially perpendicular to the inner walls of the support structure , each having a thread at the free end, the relative arrangement of the bolts and the elements ( 104 ) of the secondary insulating lock to one another is such that the bolts are perpendicular to the two opposite circumferential edges of the bottom plate ( 5 ) of the elements of the secondary Isolation lock are arranged, wherein a recess ( 108 ) is provided in the plate forming the cover ( 7 ) of the element and by the thickness of the honeycomb block ( 106 ) perpendicular to each bolt, the bottom of the recess being formed by the bottom plate, which has an opening ( 109 ) for the passage of a bolt, one of which is attached to the bolt arranged disc rests on the bottom of the recess and is held by a screwed on the bolt nut to effect the attachment of the element of the secondary insulating lock to the support structure. 5. Tank according to claim 4, characterized in that each recess ( 108 ) after fastening the secondary insulating barrier element ( 104 ) to the supporting structure ( 1 , 2 ) is closed with a thermally insulating plug, the between the elements of the secondary insulating barrier existing joints can also be filled with a thermally insulating material ( 10 ). 6. Tank according to one of claims 1 to 5, characterized in that the honeycomb cell block ( 106 ) is formed from a folded cardboard web. 7. Tank according to one of claims 1 to 6, characterized in that the honeycomb cell block ( 106 ) has radiation reflector elements which cover at least part of the flat inner sides of the cells of the honeycomb structure, wherein the radiation reflector elements can be silver-coated foils or polished aluminum foils. 8. Tank according to one of claims 1 to 7, characterized in that at least some of the walls of the honeycomb cell block ( 106 ) are perforated such that a fluid connection between the cells and the outside of the block is ensured, and that of the secondary insulation barrier ( 104th ) Ingested volume is exposed to a low absolute pressure between 0.1 and 300 millibars, preferably between 2 and 3 millibars. 9. Tank according to claim 8, characterized in that the low-pressure gas, which occupies the volume of the secondary insulation barrier ( 104 ), is an inert gas, which lends satisfactory insulation properties ver. 10. Tank according to claim 8 or 9, characterized in that the volume taken up by the secondary insulating lock ( 104 ) is permanently connected to a controllable vacuum pump to the pressure in this volume depending on the desired evaporation in the tank as a fuel for regulate the propulsion of the liquid gas stored in the ship. 11. Tank according to claim 10, characterized in that the vacuum pump pe self-regulating, such that it increases when the pressure in the volume increases a predetermined pressure threshold, e.g. about 7 millibars, starts to work and when a predetermined lower pressure is reached threshold value, for example about 2 to 3 millibars, stops working. 12. Tank according to one of claims 9 to 11, characterized in that the primary insulation lock is replaced by an impact-resistant mechanical protective device ( 16 ), the thermal insulation being carried out exclusively by the secondary insulation lock ( 104 ).