JP2013238285A - Liquid storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid storage tank in which a pipe used for supply and discharge of liquid and for other purposes is easily installed without degrading its cold storage function, the liquid storage tank having a heat insulating member installed between a roof and a liquid level inside a tank body for storing low-temperature liquid such as liquid nitrogen, liquid hydrogen, etc. for the purpose of a countermeasure taken for sloshing or the like.SOLUTION: In a liquid storage tank which includes a tank body 1 formed with a storage section 8 thereinside for hermetically storing liquid L and in which a heat insulating member 9 is installed at a position that is lower than a roof 6 inside the tank body 1 and higher than the liquid level L1 of stored liquid L, pipes 16 are installed which are introduced from a side of the roof 6 into the tank body 1 to be installed within the stored liquid L, and a cylindrical portion 13 through which the pipes 16 penetrate vertically is formed integrally with the heat insulating member 9.

Description

  The present invention relates to a liquid storage tank that stores an ultra-low temperature liquid such as liquefied natural gas, liquid nitrogen, or liquid hydrogen.

  2. Description of the Related Art Conventionally, a liquid storage tank including a tank body in which a storage unit for storing a liquid such as ultra-low frequency liquefied natural gas (LNG), liquid nitrogen, or liquid hydrogen in a sealed state is known.

  By the way, such an ultra-low temperature liquid has a problem of sloshing where the liquid surface undulates at sea or on land or when an earthquake occurs. Specifically, because the roof side inner surface (top surface) of the tank body is hotter than other inner surfaces that contact the ultra-low temperature liquid, if the liquid contacts the roof side inner surface by sloshing, the liquid evaporates. And pressure changes occur, causing various inconveniences.

  For this reason, the patent which prevents the contact to the roof inner surface side of the liquid at the time of sloshing by installing a heat insulation member in a position below the roof in the tank body and above the liquid level of the stored liquid Liquid storage tanks shown in documents 1 and 2 are known.

JP 7-158313 A JP 2000-304195 A

  In the liquid storage tank of the above document, it is necessary to pipe a pipe for supplying or discharging the liquid, but in order to improve the cold insulation function, a heat insulating member provided between the roof in the tank body and the liquid surface is the pipe. In addition to being a hindrance, there is a problem that the cold insulation function may be lowered if the piping of the pipe is not appropriate.

  The present invention is a liquid storage tank in which a heat insulating member is installed between a roof and a liquid surface in a tank body for storing a low-temperature liquid such as liquid nitrogen or liquid hydrogen for the purpose of anti-sloshing, etc. It is an object of the present invention to provide a liquid storage tank that can be easily provided with a pipe for supplying or discharging liquid without lowering the pressure.

  In order to solve the above-mentioned problem, firstly, the storage unit 8 for storing the liquid L in a sealed state is provided with a tank body 1 formed therein, and is located below the roof 6 in the tank body 1 and In the liquid storage tank in which the heat insulating member 9 is installed at a position above the liquid level L1 of the stored liquid L, a pipe introduced into the tank body 1 from the roof 6 side and piped into the stored liquid L 16 is provided, and the cylindrical portion 13 through which the pipe 16 is inserted in the vertical direction is formed integrally with the heat insulating member 9.

  Secondly, the tank body 1 is formed into a hollow spherical shape, and the heat insulating member 9 is formed into a horizontal circular plate shape having an outer edge along the inner peripheral surface of the tank body 1, and the ceiling surface 6a side and the liquid surface L1 are formed. It is characterized in that the gap is blocked by a heat insulating member 9.

  Thirdly, the cylindrical portion 13 is arranged and formed in the center of the heat insulating member 9 in plan view, and the heat insulating member 9 is formed in a symmetrical shape that is divided in half with the axis S of the cylindrical portion 13 as a boundary. It is a feature.

  Fourth, the gap between the inner periphery of the cylindrical portion 13 and the outer periphery of the pipe 16 is filled with a filler 17 made of a heat insulating material or a cold insulating material.

  Fifth, the mounting ring 12 and the installation ring 11 having a circular outer edge along the inner peripheral surface of the tank body 1 are provided, and the outer edge side of the installation ring 11 is fixed to the inner peripheral surface of the tank main body 1. The heat insulating member 9 is attached and supported on the inner peripheral surface of the tank body 1 by attaching the outer edge side to the attachment ring 12 and attaching and fixing the attachment ring 12 to the installation ring 11.

  Sixth, the attachment ring 12 is attached and fixed to the installation ring 11 in a close contact state with a high tension bolt.

  Seventh, the mounting ring 12 is made of a metal having a lower thermal conductivity than the metal installation ring 11, and the mounting ring 12 and the installation ring 11 are joined in the circumferential direction via the clad steel. It is characterized by.

  Eighth, the mounting ring 12 is made of stainless steel and the installation ring 11 is made of aluminum.

  Ninth, the tank body 1 is a double tank having an outer shell 3 and an inner shell 2, and a heat insulating layer 4 is formed between the outer shell 3 and the inner wall 2, and the heat insulating layer 4 has a two-layer structure. The inner layer of the heat insulating layer 4 is a first heat insulating layer 4a provided with an elastic material 29 that expands and contracts in the radial direction of the tank body 1, and the outer layer of the heat insulating layer 4 is filled with a filler 31 and is second. It is the heat insulating layer 4b.

  Tenth, a flexible deformable partition sheet 32 is interposed between the first heat insulating layer 4a and the second heat insulating layer 4b, and the surface of the partition sheet 32 is wrinkled. Yes.

  Eleventh, the elastic material 29 is glass wool and the filler 31 is pearlite.

  Since a pipe that is introduced into the tank body from the roof side and is piped into the stored liquid is provided, and a cylindrical portion through which the pipe is inserted vertically is formed integrally with the heat insulating member, the tank body The heat insulating member provided between the room and the liquid surface realizes anti-sloshing measures and improves the heat retention function, and it is also possible to easily pipe the pipe from the roof side to the liquid side via the cylindrical part. The structure of the piping part prevents the cold insulation performance from being lowered.

  In addition, the tank body is formed into a hollow sphere, the heat insulating member is formed into a horizontal circular plate shape having an outer edge along the inner peripheral surface of the tank body, and the space between the ceiling surface and the liquid surface is blocked by the heat insulating member. According to the present invention, the ultra-low temperature liquid can be stably stored by its spherical shape.

  In addition, according to the cylindrical portion arranged and formed in the center of the heat insulating member in plan view, the heat insulating member is formed in a symmetrical shape that is divided in half with respect to the axis of the cylindrical portion. Since the heat insulating member to be included can be formed by a pair of divided parts, and the mold for integral molding can be made to have the same shape, the manufacturing cost can be reduced and the assembling work can be facilitated.

  Moreover, according to the thing in which the clearance gap located between the inner periphery of a cylindrical part and the outer periphery of a pipe was filled with the filler which consists of a heat insulating material or a cold insulating material, cold insulation performance improves further.

  In addition, a mounting ring and an installation ring having a circular outer edge along the inner peripheral surface of the tank body are provided, the outer edge side of the installation ring is fixed to the inner peripheral surface of the tank body, and the outer edge side of the heat insulating member is attached to the mounting ring. By mounting and fixing the mounting ring to the installation ring, the heat insulating member can be stably supported above the liquid level by the mounting ring and the installation ring. .

  In addition, if the mounting ring is fixedly attached to the installation ring in a close contact state with a high tension bolt, the mounting ring is fixed to the installation ring in a close contact state. Rise.

  The mounting ring is made of a metal having a lower thermal conductivity than the metal installation ring, and the mounting ring and the installation ring are joined in the circumferential direction via the clad steel. The airtightness between the installation ring and the installation ring is further improved by the joint portion, and the cold insulation performance can be further improved.

  On the other hand, the tank body is a double tank having an outer shell and an inner shell, a heat insulating layer is formed between the outer shell and the inner wall, the heat insulating layer has a two-layer structure, and the inner layer of the heat insulating layer is a tank. According to the first heat insulating layer provided with the elastic material that expands and contracts in the radial direction of the main body, and the outer layer of the heat insulating layer is the second heat insulating layer filled with the filler, Along with the improvement, the gap generated by the cycle of shrinkage deformation at low temperature and return deformation at normal temperature is covered with an elastic material to prevent the settling of the filler, and thereby the tank body due to consolidation caused by the settling of the filler It becomes possible to prevent destruction.

  Moreover, according to what the wrinkle process was given to the surface of the partition sheet | seat which inserted the flexible deformable partition sheet which divides both between the 1st heat insulation layer and the 2nd heat insulation layer, The second heat insulating layer can be surely separated, and when the size of the tank body changes due to expansion or contraction due to thermal change, the partition sheet also expands and contracts, so that tearing and the like are efficiently prevented. .

It is sectional drawing which shows the structure of the liquid storage tank to which this invention is applied. It is a plane sectional view showing the composition in a cylindrical part. It is principal part sectional drawing of FIG. It is a disassembled perspective view which shows the structure of a barrier plate, a mounting ring, and an installation ring. It is a perspective view which shows the other example of a mounting ring and a barrier plate. It is sectional drawing of the tank main body which shows the structure of a heat insulation layer. It is sectional drawing of the tank main body which shows the state which the glass wool of the heat insulation layer expanded. It is a principal part enlarged view of FIG.

  FIG. 1 is a cross-sectional view showing a configuration of a liquid storage tank to which the present invention is applied. The illustrated liquid storage tank includes a tank body 1 that is formed in a hollow and spherical shape in which an ultra-low temperature liquid L is accommodated. The liquid storage tank is installed in the hull and transported by sea, and its diameter is set to about 20 to 70 m.

  The liquid storage tank of the present invention is not limited to the one that is transported by sea, but may be one that is fixedly installed on the ground or one that is installed on a vehicle for land transportation. Furthermore, as the ultra-low temperature liquid L, for example, LNG, liquid nitrogen, liquid hydrogen, or the like is assumed, and it means a liquid that vaporizes at room temperature.

  The tank body 1 has a double structure having an inner shell 2 and an outer shell 3, and the outer shell 3 is made of steel, for example, and the inner shell 2 is made of aluminum, for example. A heat insulating layer 4 is formed between them. The upper end portion of the tank body 1 is a roof 6 that covers the upper side of the liquid. From the uppermost end portion of the roof 6, a cylindrical projection 7 is integrally formed so as to protrude upward.

  The material of the inner shell 2 and the outer shell 3 is not limited to steel or aluminum, and may be any material as long as it has excellent strength and low temperature characteristics. The configuration of the heat insulating layer 4 will be described later.

  In the inner shell 2 of the tank body 1, a spherical storage chamber (storage unit) 8 for storing liquid nitrogen or liquid hydrogen, which is an ultra-low temperature liquid L, is formed, and approximately 98% of the storage chamber 8 has an ultra-low temperature. The liquid L is filled, and the liquid level L1 of the liquid L is close to the roof 6 of the tank body 1. When sloshing occurs that the liquid surface undulates during transportation or during an earthquake, if there is nothing between the liquid surface L1 and the roof 6, the inner surface (ceiling surface 6a) of the roof 6 that is not in contact with the liquid L at the normal time. The liquid may come into contact, the pressure in the storage chamber 8 may change, and the liquid L may evaporate.

  In order to prevent such problems due to sloshing, a horizontal barrier plate 9 is disposed below the roof 6 and above the liquid level L1. The barrier plate 9 is a heat insulating member having a heat insulating process applied to itself or the upper surface or the lower surface, and the outer edge of the barrier plate 9 is close to the ring-shaped plane cross-sectional shape of the tank body 1 over the entire circumference. The barrier plate 9 is supported and fixed in the tank body 1 by a circular and circular installation ring 11 and a mounting ring 12 and a clad steel that firmly bonds the installation ring 11 and the mounting ring 12 to each other. ing.

  A cylindrical portion 13 extending in the vertical direction so as to protrude upward from the upper surface of the barrier plate 9 is integrally formed on the central portion side of the barrier plate 9. The cylindrical portion 13 has a circular ring-shaped flat cross-sectional shape whose center coincides with the barrier plate 9, and both ends in the axial direction of the cylindrical portion 13 are open, so that the inner peripheral surface of the cylindrical portion 13 On the side, a piping sleeve 14 is inserted and supported in a cylindrical shape extending in the vertical direction.

  FIG. 2 is a plan cross-sectional view showing the configuration inside the cylindrical portion. As shown in FIGS. 1 and 2, the upper end portion of the piping sleeve 14 protrudes upward from the protruding portion 7 of the tank body 1, and the lower end portion is located in the liquid L in the tank body 1. The one or a plurality of (three in the illustrated example) pipes 16 for supplying or discharging the liquid L are inserted in a posture in which they are directed in the vertical direction. That is, the cylindrical portion 13 also functions as an insertion portion that allows the pipe 16 to be inserted vertically.

  By the way, the piping sleeve 14 protrudes from the upper end surface of the protruding portion 7, but processing such as filling and welding is performed so that no gap is formed in the portion of the protruding portion 7 through which the piping sleeve 14 passes, The protruding portion 7 is arranged and formed so as to have the same axis as the piping sleeve 14 and the cylindrical portion 13. In addition, the outer peripheral surface and the upper end surface of the protrusion 7 are covered with polyurethane foam or the like as the heat insulating material 15 to prevent the inner periphery of the protrusion 7 from being warmed by the outside air as much as possible.

  The piping sleeve 14 has an outer peripheral surface side fixed to the inner peripheral side of the tubular portion 13 by welding or the like, and the plurality of pipes 16 are inserted into the piping sleeve 14 in a bundled state. A gap formed between the inner peripheral surface of the pipe sleeve 14 and the outer peripheral surface of the pipe 16, which is a gap located between the inner peripheral surface of the tubular portion 13 and the outer peripheral surface of the pipe 16, or between the outer peripheral surfaces of adjacent pipes 16 In the gap formed between them, a filler 17 such as a heat insulating material or a cold insulating material (in the illustrated example, a cold insulating material) is filled.

  The upper and lower open ends of the piping sleeve 14 are closed by welding the inner peripheral surface of the piping sleeve 14 and the outer peripheral surface of the pipe 16 over the entire circumferential direction. The liquid L is prevented from entering. According to such a heat insulation and cold insulation structure, heat conduction in the vertical direction with the barrier plate 9 as a boundary is suppressed to the minimum even when the barrier plate 9 is vertically penetrated for piping. Incidentally, if the inner peripheral surface of the piping sleeve 14 and the outer peripheral surface of the pipe 16 can be sealed over the entire circumferential direction, a member such as a filler may be filled between the two.

  3 is a cross-sectional view of the main part of FIG. 1, and FIG. 4 is an exploded perspective view showing the configuration of the barrier plate, the mounting ring, and the installation ring. As shown in FIGS. 1, 3 and 4, the installation ring 11 and the attachment ring 12 are arranged and formed in a circular donut shape whose center is located on the axis S of the cylindrical portion 13.

  The diameter (outer diameter) of the outer edge of the installation ring 11, the outer diameter of the mounting ring 12, and the diameter of the barrier plate 9 are set to be gradually smaller in this order, and the diameter (inner diameter) of the installation ring 11 on the circular cavity side. Is set smaller than the outer shape of the mounting ring 12, and the inner diameter of the mounting ring 12 is set smaller than the diameter of the barrier plate 9.

  For this reason, the installation ring 11, the mounting ring 12, and the barrier plate 9 are successively arranged in this order, and the outer edge of the installation ring 11 is welded to the inner peripheral surface of the inner shell of the tank body 1 over the entire circumferential direction. The upper surface near the outer edge of the mounting ring 12 is bonded and fixed to the lower surface near the inner edge of the installation ring 11, and the upper surface near the outer edge of the barrier plate 9 is brought into close contact with the lower surface near the inner edge of the mounting ring 12. By doing so, the barrier plate 9 is supported and fixed to the inner peripheral surface of the tank body 1. In addition, the cylindrical portion 13 or the barrier plate 9 (in the illustrated example, the upper end portion of the cylindrical portion 9) may be attached and supported on the upper end portion in the protruding portion 7 by the support member 18 as necessary.

  The installation ring 11 is made of an aluminum material that is the same metal as the inner shell 2, and the installation ring 11 is fixed to the inner surface of the inner shell 2 by welding. The mounting ring 12 is made of a stainless material, which is a metal having a lower heat conduction efficiency than the installation ring 11, and the installation ring 11 and the mounting ring 12 are firmly bonded over the entire circumferential direction via clad steel. It is fixed.

  The barrier plate 9 and the cylindrical portion 13 are integrally formed of, for example, stainless steel, and the outer edge portion of the barrier plate 9 is a plurality of bolts 19 and nuts 21 that are uniformly arranged at predetermined intervals in the entire circumferential direction. Thus, the bolt is detachably fixed to the mounting ring 12.

  A polyurethane foam or the like, which is a heat insulating material 22, is stacked and installed on the barrier plate 9 so that the upper surface of the barrier plate 9 and the outer periphery of the tubular portion 13 are covered, and the heat insulating performance of the barrier plate 9 is enhanced. In the illustrated example, the heat insulation treatment is performed on the upper surface side of the barrier plate 9. However, the heat insulation treatment may be performed on the lower surface side of the barrier plate 9, or the barrier plate itself is configured by a highly heat insulating member. May be. Moreover, between the inner peripheral side of the protrusion part 7 and the outer peripheral side of the piping sleeve 14, a part or the whole of the axial direction may be filled with a heat insulating material to further improve the cold insulation performance.

  By improving the heat shielding performance by the mounting ring 12 having a high heat insulating property and the barrier plate 9 subjected to the heat insulating treatment, the mounting ring 12 and the installation ring 11 are clad-joined over the entire circumferential direction. Airtightness is improved, and the liquid L is prevented from leaking to the upper surface side of the barrier plate 9 during sloshing. In addition, a flexible seal (not shown) may be inserted into a gap between the barrier plate 9 and the mounting ring 12 on the contact surface side to improve the airtightness, or an HTB (high tension bolt) not shown. ), The mounting ring 12 may be firmly bolted to the installation ring 11 over the entire circumferential direction in a close contact state, which also improves the airtightness and enhances the heat insulating effect.

  The barrier plate 9 including the cylindrical portion 13, the mounting ring 12, and the installation ring 11 are symmetrically formed with respect to the axis S of the cylindrical portion 13, and are halved. In other words, the barrier plate 9, the mounting ring 12, and the installation ring 11 including the cylindrical portion 13 are symmetrical with respect to a split surface (not shown) that is in parallel with the axis S of the cylindrical portion 13. The barrier plate 9, the installation ring 11, and the attachment ring 12 are each constituted by a pair of divided bodies 23A, 23B, 24A, 24B, 26A, and 26B that are divided by the divided surfaces.

  The barrier plate 9 including the tubular portion 13, the attachment ring 12, and the installation ring 11 are end portions (joint end portions) that are in contact with the dividing surfaces of the pair of divided bodies 23A, 23B, 26A, 26B, 24A, and 24B. ) The whole shape is formed by joining and fixing them together by welding or the like. The barrier plate 9, the installation ring 11 and the mounting ring 12 constituted by the pair of divided bodies 23A, 23B, 24A, 24B, 26A and 26B divided in half are divided into the pair of divided bodies 23A, 23B and 24A. , 24B, 26A, and 26B can be installed separately, so that the burden of assembling work is reduced even if it is a large member itself.

  Incidentally, in the manufacturing process of this liquid storage tank, the tank body 1 is formed sequentially from the lower side, but the roof 6 is not formed until the installation ring 11, the mounting ring 12 and the barrier plate 9 are installed. Leave open to improve work efficiency.

  FIG. 5 is a perspective view showing another example of the mounting ring and the barrier plate. A flange portion 27 that extends in the direction of the end face is integrally formed at the joint end of the divided bodies 23A, 23B, 24A, 24B, 26A, and 26B of the barrier wall 9 or the installation ring 11 and the mounting ring 12, and a pair of divided bodies 23A and 23B. , 24A, 24B, 26A, and 26B may be closely fixed to each other in a plane shape and fixed by welding or bolts. Incidentally, the flange portion 27 is formed to protrude upward in the horizontal portion of the barrier plate 9 and the two rings 11 and 12, and is formed to protrude outward in the radial direction in the tubular portion 13.

  Further, one or both of the front and back surfaces connected when the joined end portions of the divided bodies 23A, 23B, 24A, 24B, 26A, and 26B of the barrier plate 9, the installation ring 11 or the mounting ring 12 are joined to each other are connected to each other. The divided bodies 23A, 23B, 24A, 24B, 26A, and 26B may be connected and fixed to each other by a member such as the connecting tool 28.

Next, the structure of the heat insulation layer 4 is demonstrated based on FIG. 6 thru | or FIG.
6 is a cross-sectional view of the tank main body showing the configuration of the heat insulating layer, FIG. 7 is a cross-sectional view of the tank main body showing a state where the glass wool of the heat insulating layer is enlarged, and FIG. 8 is an enlarged view of the main part of FIG. FIG. The thickness of the heat insulating layer 4 formed between the outer shell 3 and the inner wall 2 of the tank body 1 is set to about 1 m, and the heat insulating layer 4 has a two-layer structure.

  The inner shell layer of the heat insulating layer 4 becomes the first heat insulating layer 4a provided with glass wool 29 which is an elastic material that elastically expands and contracts in the radial direction of the tank body 1, and the outer shell layer of the heat insulating layer 4 is filled. A partition sheet made of aluminum foil that can be deformed flexibly over the entire boundary portion between the first heat insulation layer 4a and the second heat insulation layer 4b. 32 is inserted, and the partition sheet 32 partitions the first heat insulation layer 4a and the second heat insulation layer 4b.

  Further, on the lower surface side of the tank main body 1, a vacuum is formed by discharging a gas such as air in at least the second heat insulating layer 4b (in the illustrated example, the first heat insulating layer 4a and the second heat insulating layer 4b). While the pump 33 is provided, a gas such as air or an inert gas is provided on at least the second heat insulating layer 4b (in the illustrated example, the first heat insulating layer 4a and the second heat insulating layer 4b) on the upper surface side of the tank body 1. A pressure pipe 34 is installed to increase the pressure by pouring.

  Further, a second barrier 36 is formed on the outer surface of the outer surface of the outer shell 3, and a temporary storage chamber 37 is formed between the second barrier 36 and the outer shell 3. At the time of leakage, the leakage from the tank body 1 is temporarily stored in the temporary storage chamber 37. A transfer pipe 38 is piped on the second barrier 36 side, and this transfer pipe 38 is piped to the upper end of the tank body 1 through the second heat insulating layer 4 b in a state where no gas is exchanged. The liquid or gas leaked material functions to another tank (not shown). Incidentally, on the upstream side of the transfer pipe 38, an open / close valve 39 for opening and closing a flow path from the temporary storage chamber 37 to another tank is installed.

  The glass wool 29 of the first heat-insulating layer 4a is filled between the inner shell 2 and the partition sheet 32 in a state where the thickness is compressed to about 40% compared to that when no load is applied. Due to the thermal cycle in which the expansion and contraction are repeated, the tank body 1 expands and contracts in the radial direction in accordance with the capacity change caused by the change in the size of the inner shell 2 and the outer shell 3.

  Specifically, when the capacity of the heat insulating layer 4 is reduced, the filled material 31 such as pearlite is uniformly filled in the entire circumferential direction, and the elastic material 29 such as glass wool is also reduced in the entire circumferential direction. On the other hand (see FIG. 6), when the capacity of the heat insulating layer 4 is increased, the stretchable material 29 such as compressed glass wool restores the thickness and prevents sedimentation of the filler 31 such as pearlite. Still, the filler 31 is biased downward by its own weight, but the upper space caused by this bias is filled by expanding the upper portion of the elastic material 29 such as glass wool radially outward (see FIG. 7). ).

  That is, in addition to filling the space so that no gap is generated in the heat insulating layer 4 by the expansion and contraction action of the elastic material 29 in the radial direction, the filler 31 such as pearlite filled in the second heat insulating layer 4b is in the same temperature state. The change of density is suppressed. By the way, when there is no expansion / contraction action of the glass wool 29, the pearlite 31 repeats the movement due to thermal contraction, so that the density of the pearlite 31 is biased even under the same temperature and the same capacity. As a result, the load is intensively applied, resulting in failure.

  The second heat insulating layer 4b is subjected to vacuum processing by the vacuum pump 33 in a state where the pearlite 31 is filled, and becomes a low pressure vacuum or a substantially vacuum state, and the heat insulating effect is further enhanced.

  The partition sheet 32 prevents a gas flow between the first heat insulating layer 4 a and the second heat insulating layer 4 b and changes flexibly according to the expansion and contraction of the glass wool 29. Specifically, the partition sheet 32 is configured by connecting a plurality of sheet pieces 41, and adjacent sheet pieces 41, 41 wrap end portions 41 a, 41 a with each other, and the wrap portion is bonded to the adhesive 42. It is connected by spot bonding with.

  Incidentally, as shown in FIG. 8, when the sheet pieces 41 that are vertically adjacent to each other are connected to each other, the end 41 a of the upper sheet piece 41 is positioned inside, and the end 41 a of the lower sheet piece 41 is located. The two end portions 41a and 41a are affixed in a state where is positioned on the outside, thereby effectively preventing leakage of the leakage in the first heat insulating layer 4a into the second heat insulating layer 4b. doing.

  Further, the partition sheet 32 is fixed to the glass wool 29 with a pin (not shown), and corrugation processing for wrinkling the corrugated shape is performed in advance. By this corrugation processing, the partition sheet 32 is torn when the glass wool 29 expands and contracts. Is prevented.

  In this way, the airtightness between the first heat insulation layer 4a and the second heat insulation layer 4b is enhanced, and the leaked material leaked from the storage chamber 8 to the first heat insulation layer 4a is the first heat insulation layer 4a. After being guided down, it is introduced into the temporary storage chamber 37 and collected in the other tank.

DESCRIPTION OF SYMBOLS 1 Tank main body 2 Inner shell 3 Outer shell 4 Heat insulation layer 4a 1st heat insulation layer 4b 2nd heat insulation layer 6 Roof 8 Storage room (storage part)
9 Barrier plate (heat insulation member)
DESCRIPTION OF SYMBOLS 11 Installation ring 12 Mounting ring 13 Cylindrical part 16 Pipe 17 Filler (heat insulation material, cold insulation material)
29 Glass wool (elastic material)
31 Perlite (filler)
32 Partition sheet L Liquid L1 Liquid level S Axle

Claims (11)

  The storage part (8) for storing the liquid (L) in a sealed state includes a tank body (1) formed therein, which is located below the roof (6) in the tank body (1) and is above In the liquid storage tank in which the heat insulating member (9) is installed above the liquid level (L1) of the stored liquid (L), it is introduced into the tank body (1) from the roof (6) side and stored. A liquid storage tank in which a pipe (16) piped in the liquid (L) is provided, and a cylindrical part (13) through which the pipe (16) is vertically inserted is formed integrally with the heat insulating member (9).   The tank body (1) is formed into a hollow sphere, and the heat insulating member (9) is formed into a horizontal circular plate shape having an outer edge along the inner peripheral surface of the tank body (1), and the ceiling surface (6a) side; The liquid storage tank according to claim 1, wherein a space between the liquid levels (L1) is blocked by a heat insulating member (9).   The cylindrical part (13) is arranged and formed in the center of the heat insulating member (9) in plan view, and the heat insulating member (9) is halved with respect to the axis (S) of the cylindrical part (13) as a boundary. The liquid storage tank according to claim 1, wherein the liquid storage tank is formed into a shape.   The filling material (17) which consists of a heat insulating material or a cold insulating material was filled in the clearance gap located between the inner periphery of a cylindrical part (13), and the outer periphery of a pipe (16). Liquid storage tank.   A mounting ring (12) and an installation ring (11) having a circular outer edge along the inner peripheral surface of the tank body (1) are provided, and the outer edge side of the installation ring (11) is fixed to the inner peripheral surface of the tank main body (1). The heat insulating member (9) is attached to the mounting ring (12) on the outer edge side and the mounting ring (12) is fixed to the installation ring (11), so that the heat insulating member is attached to the inner peripheral surface of the tank body (1). The liquid storage tank according to claim 1, wherein (9) is attached and supported.   The liquid storage tank according to claim 5, wherein the attachment ring (12) is attached and fixed to the installation ring (11) in close contact with a high tension bolt.   The mounting ring (12) is made of a metal having a lower thermal conductivity than the metal installation ring (11), and the mounting ring (12) and the installation ring (11) are arranged in the circumferential direction via the clad steel. The liquid storage tank according to claim 5, which is joined to the liquid storage tank.   The liquid storage tank according to claim 7, wherein the mounting ring (12) is made of stainless steel and the installation ring (11) is made of aluminum.   The tank body (1) is a double tank having an outer shell (3) and an inner shell (2), a heat insulating layer (4) is formed between the outer shell (3) and the inner wall (2), and the heat insulating layer (4) has a two-layer structure, and the inner layer of the heat insulating layer (4) is a first heat insulating layer (4a) provided with an elastic material (29) that expands and contracts in the radial direction of the tank body (1). The liquid storage tank according to any one of claims 1 to 8, wherein the outer layer of the heat insulating layer (4) is a second heat insulating layer (4b) filled with a filler (31).   A flexible deformable partition sheet (32) is inserted between the first heat insulation layer (4a) and the second heat insulation layer (4b), and the surface of the partition sheet (32) is wrinkled. The liquid storage tank according to claim 9.   The liquid storage tank according to claim 9 or 10, wherein the stretchable material (29) is glass wool and the filler (31) is pearlite.

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