JP2006017213A - Cold insulation sealing structure of low-temperature fluid storage tank - Google Patents

Cold insulation sealing structure of low-temperature fluid storage tank Download PDF

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JP2006017213A
JP2006017213A JP2004195323A JP2004195323A JP2006017213A JP 2006017213 A JP2006017213 A JP 2006017213A JP 2004195323 A JP2004195323 A JP 2004195323A JP 2004195323 A JP2004195323 A JP 2004195323A JP 2006017213 A JP2006017213 A JP 2006017213A
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cold insulation
barrier
polyurethane foam
storage tank
fluid storage
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Masaharu Miyazaki
正治 宮崎
Tadataka Nakachi
唯渉 仲地
Tetsuo Kaneshiro
鉄男 金城
Koki Hashimoto
広喜 橋本
Toshiyuki Usami
敏之 宇佐見
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IHI Corp
Meisei Industrial Co Ltd
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Meisei Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold insulation sealing structure of a low-temperature fluid storage tank capable of preventing the temperature of an outer tank from being abruptly changed and manufacturable at low cost by preventing a low temperature fluid from leaking by a secondary barrier even if the low temperature fluid such as LNG leaks from a primary barrier to prevent the low temperature fluid from coming into direct contact with the outer tank. <P>SOLUTION: A sheet metal 4 on which a corrugation 5 for absorbing thermal extension is formed is formed as the primary barrier. A cold insulating material 2 installed to cover the inner surface of the outer tank 1 is formed of a two layer cold insulating panel 2c formed of an outer tank side panel part 2a and a primary barrier side panel part 2b. A fiber-reinforced resin coating material is formed as a surface layer barrier material 2d on the primary barrier side surface layer thereof. A fiber-reinforced resin coating material is formed as an intermediate layer barrier material 2e on the intermediate layer of the two layer cold insulation panel 2c. The secondary barrier sealing the low temperature fluid is formed of the surface layer barrier material 2d and the intermediate layer barrier material 2e. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、液化天然ガス（ＬＮＧ：Liquefied Natural Gas）等の低温の流体を貯蔵する低温流体貯蔵タンクの保冷シール構造に関するものである。   The present invention relates to a cold insulation structure for a cryogenic fluid storage tank for storing a cryogenic fluid such as liquefied natural gas (LNG).

一般に、ＬＮＧ等の低温の流体を貯蔵する低温流体貯蔵タンクは、液圧に耐える構造にすることは勿論のこと、例えば、ＬＮＧの場合、その液化温度は約−１６２［℃］であるので、大きな熱伸縮を許容でき、且つ低温流体の漏れが生じない構造にする必要がある。   In general, a cryogenic fluid storage tank that stores a low temperature fluid such as LNG has a structure that can withstand liquid pressure. For example, in the case of LNG, the liquefaction temperature is about −162 [° C.] It is necessary to have a structure that can tolerate large thermal expansion and contraction and that does not cause leakage of cryogenic fluid.

このため、従来の地下埋設式の低温流体貯蔵タンクは、図４に示される如く、コンクリート製の外槽１と、該外槽１の内面を覆うように取り付けられる保冷材２と、該保冷材２の内面側を覆うように取り付けられ且つ低温流体３をシールする防壁としての金属薄板４（メンブレン）とを備えてなる構成を有しており、前記金属薄板４には、熱伸縮を吸収するためのコルゲーション５が設けられている。   Therefore, the conventional underground buried type cryogenic fluid storage tank includes a concrete outer tub 1, a cold insulating material 2 attached so as to cover the inner surface of the outer tub 1, and the cold insulating material as shown in FIG. 4. 2, and a thin metal plate 4 (membrane) as a barrier for sealing the low temperature fluid 3. The thin metal plate 4 absorbs thermal expansion and contraction. Corrugation 5 is provided.

図４に示されるような地下埋設式の低温流体貯蔵タンクの場合、外槽１の側壁と底版には土圧が作用して常に圧縮応力が作用した状態にあるため、万一、金属薄板４からＬＮＧ等の低温流体３がリークし、外槽１を冷却したとしても、外槽１を構成するコンクリートの圧縮応力状態が保たれ、亀裂の発生を防ぐことができ、又、万一、リークした低温流体３によって外槽１が過度に冷却されて収縮し引張応力が作用して亀裂が生じたとしても、外槽１の周囲の土は凍結しており、外槽１から漏れた低温流体３が凍結線Ｌを越えて外部へ拡散する心配はなく、これにより、前記金属薄板４と凍結線Ｌで覆われた外槽１とから二重の安全性が確保されている。   In the case of an underground buried type cryogenic fluid storage tank as shown in FIG. 4, earth pressure acts on the side wall and bottom slab of the outer tub 1 so that compressive stress is always applied. Even if the low temperature fluid 3 such as LNG leaks and the outer tub 1 is cooled, the compressive stress state of the concrete constituting the outer tub 1 is maintained, and the occurrence of cracks can be prevented. Even if the outer tub 1 is excessively cooled and contracted by the low-temperature fluid 3 and the tensile stress acts and cracks occur, the soil around the outer tub 1 is frozen and the low-temperature fluid leaked from the outer tub 1 There is no worry that 3 will diffuse outside the freezing line L, and thus double safety is ensured from the thin metal plate 4 and the outer tank 1 covered with the freezing line L.

一方、低温流体貯蔵タンクが地上に設置される場合、地下埋設式の低温流体貯蔵タンクのように外槽の周囲に凍結した土が存在しないため、外槽にはプレストレスコンクリートが用いられ、外槽を圧縮応力が作用した状態に保つと共に、金属薄板を一次防壁と二次防壁の二重構造とすることにより、万一、一次防壁としての金属薄板からＬＮＧ等の低温流体がリークしたとしても、二次防壁としての金属薄板によって低温流体を食い止め、低温流体が直接コンクリートの外槽に触れないようにして、該外槽の急冷による熱衝撃（thermal shock）を防止するようになっている。   On the other hand, when the cryogenic fluid storage tank is installed on the ground, prestressed concrete is used for the outer tank because there is no frozen soil around the outer tank unlike the underground cryogenic fluid storage tank. Even if a low-temperature fluid such as LNG leaks from the metal thin plate as the primary barrier by keeping the tank in a state where compressive stress is applied and making the metal thin plate a double structure of the primary barrier and the secondary barrier. The thin metal plate as the secondary barrier prevents the low temperature fluid from coming into direct contact with the concrete outer tub, thereby preventing thermal shock caused by rapid cooling of the outer tub.

ところで、最近、低温流体貯蔵タンクを海上に設置する計画が進められており、これは、着底式ＬＮＧ受入基地（ＧＢＳ：Gravity Based Structure）と称されるものであるが、その保冷シール構造としてＬＮＧ船における技術を適用することが考えられている。   By the way, recently, a plan to install a cryogenic fluid storage tank on the sea is underway, and this is called a ground-based LNG receiving base (GBS: Gravity Based Structure). It is considered to apply technology in LNG ships.

ＬＮＧ船におけるタンクの保冷シール構造としては、例えば、ガストランスポート・メンブレン方式とテクニガス・メンブレン方式がある。   As a cold insulation seal structure of a tank in an LNG ship, for example, there are a gas transport membrane method and a technigas membrane method.

前記ガストランスポート・メンブレン方式の場合、タンクを構成する内殻の内側から順次、二次断熱箱、二次防壁、一次断熱箱、一次防壁を積層した構造を有しており、一次防壁並びに二次防壁には、金属薄板（メンブレン）として線膨張係数が低い厚さ約０．７［ｍｍ］程度のインバー材（Ｆｅ-３６％Ｎｉ）が採用されているため、コルゲーション等の特別な熱伸縮対策が不要となっている。   The gas transport membrane method has a structure in which a secondary heat insulating box, a secondary barrier, a primary heat insulating box, and a primary barrier are sequentially stacked from the inside of the inner shell constituting the tank. The next barrier is made of invar material (Fe-36% Ni) with a low linear expansion coefficient of about 0.7 [mm] as a thin metal plate (membrane), so special thermal expansion and contraction such as corrugation No countermeasure is required.

又、前記テクニガス・メンブレン方式の場合、タンクを構成する内殻の内側から順次、保冷材、二次防壁、保冷材、一次防壁を積層した構造を有しており、一次防壁には、金属薄板（メンブレン）として、熱伸縮を吸収するためのコルゲーションが設けられた厚さ約１．２［ｍｍ］程度のステンレス鋼が採用され、二次防壁には「トリプレックス（登録商標）」と称される特殊複合アルミニウムシートが採用されている。   Further, in the case of the technigas membrane method, it has a structure in which a cold insulating material, a secondary barrier, a cold insulating material, and a primary barrier are laminated in order from the inner side of the inner shell constituting the tank. As the (membrane), stainless steel with a thickness of about 1.2 [mm] provided with corrugation to absorb thermal expansion and contraction is adopted, and the secondary barrier is called “Triplex (registered trademark)”. Special composite aluminum sheet is used.

尚、地上設置式や地下埋設式の低温流体貯蔵タンクの一般的技術水準を示すものとしては、例えば、特許文献１がある。
特開２００２−１８１２８８号公報 For example, Patent Document 1 shows a general technical level of a cryogenic fluid storage tank of an above-ground type or an underground type.
JP 2002-181288 A

しかしながら、前述の如きガストランスポート・メンブレン方式では、一次防壁並びに二次防壁にインバー材が採用されているため高価であり、又、テクニガス・メンブレン方式では、二次防壁に特殊複合アルミニウムシートが採用されているためやはり高価である。   However, the gas transport membrane method as described above is expensive because Invar material is used for the primary and secondary barriers, and the special composite aluminum sheet is used for the secondary barrier in the technigas membrane method. It is expensive because it is used.

本発明は、斯かる実情に鑑み、万一、一次防壁からＬＮＧ等の低温流体がリークしたとしても、二次防壁によって低温流体を食い止め、低温流体が直接外槽に触れないようにして、該外槽の急激な温度変化を防止することができ、且つ低価格化を図り得る低温流体貯蔵タンクの保冷シール構造を提供しようとするものである。   In view of such circumstances, the present invention prevents the low temperature fluid from being blocked by the secondary barrier even if a low temperature fluid such as LNG leaks from the primary barrier, so that the low temperature fluid does not directly touch the outer tank. It is an object of the present invention to provide a cold seal structure for a cryogenic fluid storage tank that can prevent an abrupt temperature change in an outer tub and that can reduce the price.

本発明は、外槽と、該外槽の内面を覆うように取り付けられる保冷材と、該保冷材の内面側を覆うように取り付けられ且つ低温流体をシールする一次防壁とを備えた低温流体貯蔵タンクの保冷シール構造であって、
保冷材を二層の保冷パネルによって形成し、その一次防壁側の表層に繊維補強した樹脂コーティング材を表層バリア材として形成すると共に、前記二層の保冷パネルの中間層に繊維補強した樹脂コーティング材を中間層バリア材として形成し、前記表層バリア材と中間層バリア材とから低温流体をシールする二次防壁を構成したことを特徴とする低温流体貯蔵タンクの保冷シール構造にかかるものである。 The present invention relates to a cryogenic fluid storage comprising an outer tub, a cold insulating material attached to cover the inner surface of the outer tub, and a primary barrier that is attached to cover the inner surface of the cold insulating material and seals the cold fluid. A tank insulation seal structure,
A resin coating material in which a cold insulation material is formed by a two-layer cold insulation panel, and a resin coating material reinforced with fibers on the surface layer on the primary barrier side is formed as a surface barrier material, and a fiber coating material is reinforced with an intermediate layer of the two layers of cold insulation panels. Is formed as an intermediate layer barrier material, and a secondary barrier for sealing a low temperature fluid from the surface layer barrier material and the intermediate layer barrier material is formed.

前述の如く、外槽の内面を覆うように取り付けられる保冷材を二層の保冷パネルによって形成し、その一次防壁側の表層に繊維補強した樹脂コーティング材を表層バリア材として形成すると共に、前記二層の保冷パネルの中間層に繊維補強した樹脂コーティング材を中間層バリア材として形成し、前記表層バリア材と中間層バリア材とから低温流体をシールする二次防壁を構成すると、万一、一次防壁としての金属薄板からＬＮＧ等の低温流体がリークした場合、二次防壁としての表層バリア材と中間層バリア材とによって低温流体が食い止められ、低温流体が直接外槽に触れることが避けられ、該外槽の急激な温度変化を防止することが可能となる。   As described above, the cold insulating material attached so as to cover the inner surface of the outer tub is formed by a two-layer cold insulating panel, and the resin coating material reinforced with fiber on the surface layer on the primary barrier side is formed as the surface barrier material. If a secondary barrier that seals a low-temperature fluid from the surface barrier material and the intermediate barrier material is formed by forming a fiber-reinforced resin coating material on the intermediate layer of the cold insulation panel of the single layer, When a low-temperature fluid such as LNG leaks from a thin metal plate as a barrier, the low-temperature fluid is stopped by the surface barrier material and the intermediate layer barrier material as the secondary barrier, and the low-temperature fluid is prevented from directly touching the outer tank, It becomes possible to prevent a rapid temperature change of the outer tub.

前記低温流体貯蔵タンクの保冷シール構造においては、前記一次防壁を、熱伸縮を吸収するためのコルゲーションを有した金属薄板とし、更に、前記保冷パネルをポリウレタンフォームとし、前記二次防壁を構成する表層バリア材と中間層バリア材とを、ガラス繊維強化ポリウレタン樹脂又はガラス繊維強化エポキシ樹脂とすることができ、このようにすると、従来においてＬＮＧ船のタンクの保冷シール構造に採用されているガストランスポート・メンブレン方式のように、一次防壁並びに二次防壁に高価なインバー材を用いたり、或いは、テクニガス・メンブレン方式のように、二次防壁に高価な特殊複合アルミニウムシートを用いたりするのに比べ、大幅にコストを低減することが可能となり、海上等に設置される低温流体貯蔵タンクに適用する上で非常に有利となる。   In the cold insulation seal structure of the cryogenic fluid storage tank, the primary barrier is a metal thin plate having corrugation for absorbing thermal expansion and contraction, and the cold insulation panel is made of polyurethane foam, and the surface layer constituting the secondary barrier The barrier material and the intermediate layer barrier material can be made of glass fiber reinforced polyurethane resin or glass fiber reinforced epoxy resin, and in this way, a gas transport conventionally used in a cold insulation seal structure for a tank of an LNG ship -Compared to using expensive invar material for the primary barrier and secondary barrier as in the membrane method, or using an expensive special composite aluminum sheet for the secondary barrier as in the technigas membrane method, Cryogenic fluid storage tank installed at sea, etc., which can greatly reduce costs It is very advantageous to apply.

又、前記低温流体貯蔵タンクの保冷シール構造においては、二層の保冷パネルの外槽側パネル部を一次防壁側パネル部より大きくしてその断面形状を凸型とし、隣接する保冷パネルの外槽側パネル部間に、注入ポリウレタンフォーム、及び／又は、圧密ガラス繊維を充填し、且つその表面をシール部材で覆うようにし、更に又、隣接する保冷パネルの一次防壁側パネル部間に、一次防壁側の表層に繊維補強した樹脂コーティング材を表層バリア材として形成したポリウレタンフォームプラグを介装すると共に、該ポリウレタンフォームプラグと前記一次防壁側パネル部との間に、注入ポリウレタンフォーム、及び／又は、圧密ガラス繊維を充填し且つその表面をシール部材で覆うようにすることができ、このようにすると、保冷パネルの継目部分におけるシール性も充分に確保することが可能となる。又、前記保冷パネルが低温となってその一次防壁側パネル部が収縮することに伴う熱応力は、前記ポリウレタンフォームプラグと前記一次防壁側パネル部との間に充填された注入ポリウレタンフォームの内部応力として吸収されるか、或いは、該注入ポリウレタンフォームが割れること、或いは、圧密ガラス繊維が熱収縮に追従する形で膨らむことによって吸収緩和される形となるが、前記保冷パネルの外槽側パネル部の表面温度は、一次防壁側パネル部に比べて高く、外槽側パネル部の収縮量も小さいため、隣接する保冷パネルの外槽側パネル部間に充填された注入ポリウレタンフォームが割れる心配はない。   In the cold seal structure of the cryogenic fluid storage tank, the outer tank side panel portion of the two-layer cold insulating panel is made larger than the primary barrier side panel portion so that the cross-sectional shape is convex, and the outer tank of the adjacent cold insulating panel Filled polyurethane foam and / or compacted glass fiber is filled between the side panel parts, and the surface thereof is covered with a sealing member. Further, the primary barrier between the primary barrier side panel parts of adjacent cold insulation panels. A polyurethane foam plug formed as a surface barrier material with a resin coating material reinforced with fiber on the surface layer on the side is interposed, and between the polyurethane foam plug and the primary barrier side panel portion, injected polyurethane foam, and / or It is possible to fill the compacted glass fiber and cover the surface with a sealing member. Sealability in minute it becomes possible to sufficiently secure. The thermal stress accompanying the shrinkage of the cold insulation panel due to the low temperature of the primary barrier side panel is the internal stress of the injected polyurethane foam filled between the polyurethane foam plug and the primary barrier side panel. Or the absorption polyurethane foam is cracked, or the compacted glass fiber is swelled in a form that follows heat shrinkage, and is absorbed and relaxed. Surface temperature is higher than the primary barrier side panel part and the shrinkage amount of the outer tank side panel part is small, so there is no concern that the filled polyurethane foam filled between the outer tank side panel parts of the adjacent cold insulation panels will break .

一方、前記低温流体貯蔵タンクの保冷シール構造においては、一次防壁を構成する金属薄板のコルゲーションをポリウレタンフォームプラグの上に位置するよう配設すると共に、該ポリウレタンフォームプラグと前記コルゲーションとの間に合板を介在させるようにすることができ、このようにすると、ＬＮＧ等の低温流体の貯留時にコルゲーションの部分から集中してポリウレタンフォームプラグに作用しようとする応力は、合板により分散され、ポリウレタンフォームプラグに余分な負荷がかからなくなる。   On the other hand, in the cold seal structure of the cryogenic fluid storage tank, the corrugation of the thin metal plate constituting the primary barrier is disposed on the polyurethane foam plug, and the plywood is interposed between the polyurethane foam plug and the corrugation. In this way, the stress that concentrates on the corrugation part during the storage of a low-temperature fluid such as LNG is dispersed by the plywood and is applied to the polyurethane foam plug. No extra load is applied.

又、前記低温流体貯蔵タンクの保冷シール構造においては、保冷パネルの一次防壁側の表面を全面に亘って耐火板で覆うようにすることができ、このようにすると、前記一次防壁を構成する金属薄板の施工時や破損箇所の修復時等に該金属薄板を溶接する際には、耐火板によって溶接の熱が遮られ、保冷パネルやポリウレタンフォームプラグが焼損することを防止可能となる。   In the cold seal structure of the cryogenic fluid storage tank, the surface of the cold barrier panel on the primary barrier side can be covered with a fireproof plate over the entire surface, and in this way, the metal constituting the primary barrier When welding the metal thin plate during construction of the thin plate or repairing a damaged portion, the heat of the welding is blocked by the fireproof plate, and the cold insulation panel and the polyurethane foam plug can be prevented from being burned out.

更に、前記低温流体貯蔵タンクの保冷シール構造においては、シール部材を繊維補強した樹脂コーティング材とすることができ、このようにすると、保冷パネルの継目部分をシールするための施工性も良好となる。   Furthermore, in the cold sealing structure of the cryogenic fluid storage tank, the sealing member can be made of a resin coating material with fiber reinforcement, and in this case, the workability for sealing the joint portion of the cold insulating panel is also improved. .

本発明の請求項１〜８記載の低温流体貯蔵タンクの保冷シール構造によれば、万一、一次防壁からＬＮＧ等の低温流体がリークしたとしても、二次防壁によって低温流体を食い止め、低温流体が直接外槽に触れないようにして、該外槽の急激な温度変化を防止することができ、且つ低価格化を図り得るという優れた効果を奏し得る。   According to the cold seal structure of the cryogenic fluid storage tank according to claims 1 to 8 of the present invention, even if a cryogenic fluid such as LNG leaks from the primary barrier, the cryogenic fluid is stopped by the secondary barrier, However, it is possible to prevent a sudden temperature change of the outer tub without directly touching the outer tub, and to achieve an excellent effect that the cost can be reduced.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１〜図３は本発明を実施する形態の一例であって、図中、図４と同一の符号を付した部分は同一物を表わしており、図１に示す低温流体貯蔵タンクは、コンクリート製で直方体形状とした外槽１のＬＮＧ等の低温流体３が貯留される貯留部１ａの外周にバラストタンク１ｂを形成し、これを海に浮かべた状態で図示していない船で曳航し、沖合の所要箇所においてバラストタンク１ｂ内に砂等のバラストＢを充填することによって、外槽１の底面を海底に着底させ、海上におけるＬＮＧ等の低温流体３の受入基地（ＧＢＳ：Gravity Based Structure）とするものである。   1 to 3 show an example of an embodiment of the present invention. In the figure, the same reference numerals as those in FIG. 4 denote the same parts, and the cryogenic fluid storage tank shown in FIG. The ballast tank 1b is formed on the outer periphery of the storage portion 1a in which the low temperature fluid 3 such as LNG of the outer tank 1 made of a rectangular parallelepiped is stored, and is towed by a ship not shown in the state of floating in the sea, By filling ballast B such as sand into the ballast tank 1b at a required location offshore, the bottom surface of the outer tub 1 is settled on the seabed, and a receiving base (GBS: Gravity Based Structure) ).

そして、本図示例の場合、図２及び図３に示す如く、熱伸縮を吸収するためのコルゲーション５が設けられた金属薄板４を一次防壁とし、外槽１の内面を覆うように取り付けられる保冷材２を、外槽側パネル部２ａと一次防壁側パネル部２ｂとからなる二層の保冷パネル２ｃによって形成し、その一次防壁側の表層（一次防壁側パネル部２ｂの表層）に繊維補強した樹脂コーティング材を表層バリア材２ｄとして形成すると共に、前記二層の保冷パネル２ｃの中間層（外槽側パネル部２ａの表層）に繊維補強した樹脂コーティング材を中間層バリア材２ｅとして形成し、前記表層バリア材２ｄと中間層バリア材２ｅとから低温流体３をシールする二次防壁を構成してある。   In the case of this illustrated example, as shown in FIG. 2 and FIG. 3, the cold insulation that is attached so as to cover the inner surface of the outer tub 1 with the metal thin plate 4 provided with the corrugation 5 for absorbing thermal expansion and contraction as the primary barrier. The material 2 is formed by a two-layer cold insulation panel 2c composed of an outer tub side panel portion 2a and a primary barrier side panel portion 2b, and fiber reinforced to the surface layer on the primary barrier side (surface layer of the primary barrier side panel portion 2b). A resin coating material is formed as the surface barrier material 2d, and a resin coating material reinforced with fibers in the intermediate layer of the two-layer cold insulation panel 2c (the surface layer of the outer tank side panel portion 2a) is formed as the intermediate layer barrier material 2e. A secondary barrier that seals the low temperature fluid 3 from the surface layer barrier material 2d and the intermediate layer barrier material 2e is formed.

前記保冷パネル２ｃはポリウレタンフォームとし、前記二次防壁を構成する表層バリア材２ｄと中間層バリア材２ｅはガラス繊維強化ポリウレタン樹脂としてある。尚、前記二次防壁を構成する表層バリア材２ｄと中間層バリア材２ｅはガラス繊維強化エポキシ樹脂としても良い。   The cold insulation panel 2c is made of polyurethane foam, and the surface barrier material 2d and the intermediate layer barrier material 2e constituting the secondary barrier are made of glass fiber reinforced polyurethane resin. The surface barrier material 2d and the intermediate layer barrier material 2e constituting the secondary barrier may be glass fiber reinforced epoxy resin.

又、前記二層の保冷パネル２ｃの外槽側パネル部２ａは一次防壁側パネル部２ｂより大きくしてその断面形状を凸型とし、隣接する保冷パネル２ｃの外槽側パネル部２ａ間には、注入ポリウレタンフォーム６及び圧密ガラス繊維７の両方を充填し、且つその表面をシール部材８で覆うようにしてある。尚、前記隣接する保冷パネル２ｃの外槽側パネル部２ａ間には、注入ポリウレタンフォーム６又は圧密ガラス繊維７のいずれか一方のみを充填するようにしても良い。   In addition, the outer tank side panel portion 2a of the two-layer cold insulation panel 2c is larger than the primary barrier side panel portion 2b and has a convex cross section, and between the outer tank side panel portions 2a of the adjacent cold insulation panels 2c. Both the injected polyurethane foam 6 and the consolidated glass fiber 7 are filled and the surface thereof is covered with the sealing member 8. In addition, you may make it fill only either one of the injection | pouring polyurethane foam 6 or the compacted glass fiber 7 between the outer tank side panel parts 2a of the said adjacent cold insulation panel 2c.

更に又、前記隣接する保冷パネル２ｃの一次防壁側パネル部２ｂ間には、一次防壁側の表層に繊維補強した樹脂コーティング材を表層バリア材２ｄ’として形成したポリウレタンフォームプラグ２ｂ’を介装すると共に、該ポリウレタンフォームプラグ２ｂ’と前記一次防壁側パネル部２ｂとの間には、注入ポリウレタンフォーム９及び圧密ガラス繊維１３の両方を充填し且つその表面をシール部材１０で覆うようにしてある。尚、前記ポリウレタンフォームプラグ２ｂ’と前記一次防壁側パネル部２ｂとの間には、注入ポリウレタンフォーム９又は圧密ガラス繊維１３のいずれか一方のみを充填するようにしても良い。   Furthermore, a polyurethane foam plug 2b ′ in which a resin coating material reinforced with fibers on the surface layer on the primary barrier side is formed as a surface barrier material 2d ′ is interposed between the primary barrier side panel portions 2b of the adjacent cold insulation panels 2c. At the same time, between the polyurethane foam plug 2b ′ and the primary barrier side panel portion 2b, both the injected polyurethane foam 9 and the consolidated glass fiber 13 are filled and the surface thereof is covered with the seal member 10. In addition, you may make it fill only either the injection | pouring polyurethane foam 9 or the compacted glass fiber 13 between the said polyurethane foam plug 2b 'and the said primary barrier side panel part 2b.

一方、前記一次防壁を構成する金属薄板４のコルゲーション５はポリウレタンフォームプラグ２ｂ’の上に位置するよう配設すると共に、該ポリウレタンフォームプラグ２ｂ’と前記コルゲーション５との間には合板１１を介在させ、該合板１１により、ＬＮＧ等の低温流体３の貯留時にコルゲーション５の部分から集中してポリウレタンフォームプラグ２ｂ’に作用しようとする応力を分散させるようにしてある。   On the other hand, the corrugation 5 of the thin metal plate 4 constituting the primary barrier is disposed on the polyurethane foam plug 2b ′, and a plywood 11 is interposed between the polyurethane foam plug 2b ′ and the corrugation 5. The plywood 11 disperses the stress that concentrates on the corrugation 5 and acts on the polyurethane foam plug 2b ′ when the low temperature fluid 3 such as LNG is stored.

又、前記保冷パネル２ｃの一次防壁を構成する金属薄板４側の表面は、全面に亘って耐火板１２で覆い、該耐火板１２により、前記一次防壁を構成する金属薄板４を溶接する際にその熱で保冷パネル２ｃやポリウレタンフォームプラグ２ｂ’が焼損することを防止するようにしてある。   The surface of the thin metal plate 4 constituting the primary barrier of the cold insulation panel 2c is covered with the fireproof plate 12 over the entire surface, and the metal thin plate 4 constituting the primary barrier is welded by the fireproof plate 12. The heat insulation panel 2c and the polyurethane foam plug 2b ′ are prevented from being burned out by the heat.

更に、前記シール部材８，１０は、繊維補強した樹脂コーティング材としてガラス繊維強化エポキシ樹脂を用いたテープ状のものとしてある。尚、前記シール部材８，１０を形成する繊維補強した樹脂コーティング材としては、ガラス繊維強化エポキシ樹脂を用いる代りにガラス繊維強化ポリウレタンを用いることも可能である。又、前記シール部材８としては、テープ状のものを使用する代りに、例えば、前記注入ポリウレタンフォーム６及び圧密ガラス繊維７が充填された外槽側パネル部２ａ間の継目部表面に樹脂を刷毛等で塗布し、その上にガラス繊維を置き、該ガラス繊維の上に再度樹脂を塗布し、更に同様の作業をもう一度繰り返すことにより、ガラス繊維と樹脂とが複数積層されるようにしたものを使用することも可能である。同様に、前記シール部材１０としては、テープ状のものを使用する代りに、例えば、前記ポリウレタンフォームプラグ２ｂ’が介装された一次防壁側パネル部２ｂ間の継目部表面に樹脂を刷毛等で塗布し、その上にガラス繊維を置き、該ガラス繊維の上に再度樹脂を塗布し、更に同様の作業をもう一度繰り返すことにより、ガラス繊維と樹脂とが複数積層されるようにしたものを使用することも可能である。   Further, the sealing members 8 and 10 are in the form of a tape using a glass fiber reinforced epoxy resin as a fiber-reinforced resin coating material. As the fiber-reinforced resin coating material for forming the sealing members 8 and 10, glass fiber reinforced polyurethane can be used instead of using glass fiber reinforced epoxy resin. For example, instead of using a tape-shaped seal member 8, for example, a resin is brushed on the surface of the joint portion between the outer tank side panel portion 2 a filled with the injected polyurethane foam 6 and the consolidated glass fiber 7. The glass fiber is placed on the glass fiber, the resin is applied again on the glass fiber, and the same operation is repeated once more so that a plurality of glass fibers and resins are laminated. It is also possible to use it. Similarly, as the sealing member 10, instead of using a tape-shaped member, for example, a resin is applied to the surface of the joint portion between the primary barrier side panel portions 2b in which the polyurethane foam plug 2b ′ is interposed by brushing or the like. Apply, place glass fiber on it, apply resin again on the glass fiber, and repeat the same operation once more to use multiple glass fibers and resin laminated. It is also possible.

次に、上記図示例の作用を説明する。   Next, the operation of the illustrated example will be described.

前述の如く、熱伸縮を吸収するためのコルゲーション５が設けられた金属薄板４を一次防壁とし、外槽１の内面を覆うように取り付けられる保冷材２を、外槽側パネル部２ａと一次防壁側パネル部２ｂとからなる二層の保冷パネル２ｃによって形成し、その一次防壁側の表層（一次防壁側パネル部２ｂの表層）に繊維補強した樹脂コーティング材を表層バリア材２ｄとして形成すると共に、前記二層の保冷パネル２ｃの中間層（外槽側パネル部２ａの表層）に繊維補強した樹脂コーティング材を中間層バリア材２ｅとして形成し、前記表層バリア材２ｄと中間層バリア材２ｅとから低温流体３をシールする二次防壁を構成すると、万一、一次防壁としての金属薄板４からＬＮＧ等の低温流体３がリークした場合、二次防壁としての表層バリア材２ｄと中間層バリア材２ｅとによって低温流体３が食い止められ、低温流体３が直接コンクリートの外槽１に触れることが避けられ、該外槽１の急激な温度変化を防止することが可能となる。   As described above, the thin metal plate 4 provided with the corrugation 5 for absorbing thermal expansion and contraction is used as the primary barrier, and the cold insulator 2 attached so as to cover the inner surface of the outer tub 1 is the outer tub side panel portion 2a and the primary barrier. Formed by a two-layer cold insulation panel 2c composed of the side panel portion 2b, and formed as a surface barrier material 2d a resin coating material reinforced with fiber on the surface layer on the primary barrier side (surface layer of the primary barrier side panel portion 2b), From the surface barrier material 2d and the intermediate layer barrier material 2e, a resin coating material reinforced with fiber is formed as an intermediate layer barrier material 2e on the intermediate layer (surface layer of the outer tank side panel portion 2a) of the two-layer cold insulation panel 2c. If a secondary barrier that seals the low temperature fluid 3 is configured, in the unlikely event that the low temperature fluid 3 such as LNG leaks from the metal thin plate 4 as the primary barrier, a surface layer barrier as the secondary barrier The low-temperature fluid 3 is stopped by the 2d and the intermediate layer barrier material 2e, and the low-temperature fluid 3 is prevented from directly touching the concrete outer tub 1 and a sudden temperature change of the outer tub 1 can be prevented. .

本図示例においては、前記保冷パネル２ｃはポリウレタンフォームとし、前記二次防壁を構成する表層バリア材２ｄと中間層バリア材２ｅはガラス繊維強化ポリウレタン樹脂としてあるため、従来においてＬＮＧ船のタンクの保冷シール構造に採用されているガストランスポート・メンブレン方式のように、一次防壁並びに二次防壁に高価なインバー材を用いたり、或いは、テクニガス・メンブレン方式のように、二次防壁に高価な特殊複合アルミニウムシートを用いたりするのに比べ、大幅にコストを低減することが可能となり、海上等に設置される低温流体貯蔵タンクに適用する上で非常に有利となる。   In the illustrated example, the cold insulation panel 2c is made of polyurethane foam, and the surface barrier material 2d and the intermediate layer barrier material 2e constituting the secondary barrier are made of glass fiber reinforced polyurethane resin. Use expensive invar material for the primary and secondary barriers, such as the gas transport membrane method used in the seal structure, or special composites that are expensive for the secondary barrier, such as the technigas membrane method Compared with the use of an aluminum sheet, the cost can be greatly reduced, which is very advantageous when applied to a cryogenic fluid storage tank installed on the sea or the like.

又、前記二層の保冷パネル２ｃの外槽側パネル部２ａは一次防壁側パネル部２ｂより大きくしてその断面形状を凸型とし、隣接する保冷パネル２ｃの外槽側パネル部２ａ間には、注入ポリウレタンフォーム６及び圧密ガラス繊維７の両方を充填し、且つその表面をシール部材８で覆うようにしてあり、更に又、前記隣接する保冷パネル２ｃの一次防壁側パネル部２ｂ間には、一次防壁側の表層に繊維補強した樹脂コーティング材を表層バリア材２ｄ’として形成したポリウレタンフォームプラグ２ｂ’を介装すると共に、該ポリウレタンフォームプラグ２ｂ’と前記一次防壁側パネル部２ｂとの間には、注入ポリウレタンフォーム９を充填し且つその表面をシール部材１０で覆うようにしてあるため、保冷パネル２ｃの継目部分におけるシール性も充分に確保することが可能となる。又、前記保冷パネル２ｃが低温となってその一次防壁側パネル部２ｂが収縮することに伴う熱応力は、前記ポリウレタンフォームプラグ２ｂ’と前記一次防壁側パネル部２ｂとの間に充填された注入ポリウレタンフォーム９の内部応力として吸収されるか、或いは、該注入ポリウレタンフォーム９が割れること、或いは、圧密ガラス繊維１３が熱収縮に追従する形で膨らむことによって吸収緩和される形となるが、前記保冷パネル２ｃの外槽側パネル部２ａの表面温度は、一次防壁側パネル部２ｂ側に比べて高く、外槽側パネル部２ａの収縮量も小さいため、隣接する保冷パネル２ｃの外槽側パネル部２ａ間に充填された注入ポリウレタンフォーム６が割れる心配はない。   In addition, the outer tank side panel portion 2a of the two-layer cold insulation panel 2c is larger than the primary barrier side panel portion 2b and has a convex cross section, and between the outer tank side panel portions 2a of the adjacent cold insulation panels 2c. In addition, both the injected polyurethane foam 6 and the consolidated glass fiber 7 are filled, and the surface thereof is covered with the sealing member 8, and between the primary barrier side panel portions 2b of the adjacent cold insulation panels 2c, A polyurethane foam plug 2b ′ formed as a surface barrier material 2d ′ with a fiber-reinforced resin coating material on the surface layer on the primary barrier side is interposed, and between the polyurethane foam plug 2b ′ and the primary barrier side panel portion 2b. Is filled with the injected polyurethane foam 9 and the surface thereof is covered with the sealing member 10, so that the sheet at the seam portion of the cold insulation panel 2c is covered. Sex it becomes possible to sufficiently secure. In addition, the thermal stress accompanying the shrinkage of the primary barrier side panel portion 2b due to the cold insulation panel 2c having a low temperature is injected between the polyurethane foam plug 2b ′ and the primary barrier side panel portion 2b. It is absorbed as internal stress of the polyurethane foam 9, or the injected polyurethane foam 9 is cracked, or the compacted glass fiber 13 swells in a form that follows thermal shrinkage, but is absorbed and relaxed. Since the surface temperature of the outer tub side panel portion 2a of the cold insulation panel 2c is higher than that of the primary barrier side panel portion 2b and the shrinkage amount of the outer tub side panel portion 2a is small, the outer tub side panel of the adjacent cold insulation panel 2c. There is no concern that the injected polyurethane foam 6 filled between the portions 2a will break.

一方、前記一次防壁を構成する金属薄板４のコルゲーション５はポリウレタンフォームプラグ２ｂ’の上に位置するよう配設すると共に、該ポリウレタンフォームプラグ２ｂ’と前記コルゲーション５との間には合板１１を介在させるようにしてあるため、ＬＮＧ等の低温流体３の貯留時にコルゲーション５の部分から集中してポリウレタンフォームプラグ２ｂ’に作用しようとする応力は、合板１１により分散され、ポリウレタンフォームプラグ２ｂ’に余分な負荷がかからなくなる。   On the other hand, the corrugation 5 of the thin metal plate 4 constituting the primary barrier is disposed on the polyurethane foam plug 2b ′, and a plywood 11 is interposed between the polyurethane foam plug 2b ′ and the corrugation 5. Therefore, the stress that acts on the polyurethane foam plug 2b ′ in a concentrated manner from the corrugation 5 during storage of the low temperature fluid 3 such as LNG is dispersed by the plywood 11 and is extraneous to the polyurethane foam plug 2b ′. Heavy load is not applied.

又、前記保冷パネル２ｃの一次防壁を構成する金属薄板４側の表面は、全面に亘って耐火板１２で覆うようにしてあるため、前記一次防壁を構成する金属薄板４の施工時や破損箇所の修復時等に該金属薄板４を溶接する際には、耐火板１２によって溶接の熱が遮られ、保冷パネル２ｃやポリウレタンフォームプラグ２ｂ’が焼損することが防止可能となる。   In addition, since the surface of the metal thin plate 4 constituting the primary barrier of the cold insulation panel 2c is covered with the fireproof plate 12 over the entire surface, the metal thin plate 4 constituting the primary barrier 4 may be covered or damaged. When the metal thin plate 4 is welded at the time of repair, etc., the heat of the welding is blocked by the refractory plate 12, and it is possible to prevent the cold insulation panel 2c and the polyurethane foam plug 2b ′ from being burned out.

更に、前記シール部材８，１０は、繊維補強した樹脂コーティング材としてガラス繊維強化エポキシ樹脂を用いたテープ状のものとしてあるため、保冷パネル２ｃの継目部分をシールするための施工性も良好となる。   Furthermore, since the sealing members 8 and 10 are tape-shaped using glass fiber reinforced epoxy resin as a fiber-reinforced resin coating material, the workability for sealing the joint portion of the cold insulation panel 2c is also good. .

こうして、万一、一次防壁からＬＮＧ等の低温流体３がリークしたとしても、二次防壁によって低温流体３を食い止め、低温流体３が直接外槽１に触れないようにして、該外槽１の急激な温度変化を防止することができ、且つ低価格化を図り得る。   Thus, even if the low temperature fluid 3 such as LNG leaks from the primary barrier, the low temperature fluid 3 is stopped by the secondary barrier so that the low temperature fluid 3 does not touch the outer tank 1 directly. A rapid temperature change can be prevented and the price can be reduced.

尚、本発明の低温流体貯蔵タンクの保冷シール構造は、上述の図示例にのみ限定されるものではなく、海上に設置されるタンクに限らず、プレストレスコンクリート製等の地上に設置される低温流体貯蔵タンクの冷熱抵抗緩和材にも適用可能なこと等、その他、本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   The cold insulation seal structure of the low-temperature fluid storage tank of the present invention is not limited to the illustrated example described above, and is not limited to a tank installed on the sea, but a low temperature installed on the ground such as prestressed concrete. Needless to say, various modifications can be made without departing from the gist of the present invention, such as being applicable to a cooling resistance reducing material for a fluid storage tank.

本発明を実施する形態の一例を示す全体概要側断面図である。It is a whole outline side sectional view showing an example of an embodiment which carries out the present invention. 本発明を実施する形態の一例を示す要部拡大断面図であって、図１のＩＩ部相当図である。It is a principal part expanded sectional view which shows an example of the form which implements this invention, Comprising: It is the II section equivalent figure of FIG. 本発明を実施する形態の一例における保冷材を示す斜視図である。It is a perspective view which shows the cold insulating material in an example of the form which implements this invention. 従来の地下埋設式の低温流体貯蔵タンクの一例を示す全体概要側断面図である。It is a whole outline side sectional view showing an example of the conventional underground buried type cryogenic fluid storage tank.

符号の説明Explanation of symbols

１ 外槽
２ 保冷材
２ａ 外槽側パネル部
２ｂ 一次防壁側パネル部
２ｂ’ ポリウレタンフォームプラグ
２ｃ 保冷パネル
２ｄ 表層バリア材
２ｄ’ 表層バリア材
２ｅ 中間層バリア材
３ 低温流体
４ 金属薄板
５ コルゲーション
６ 注入ポリウレタンフォーム
７ 圧密ガラス繊維
８ シール部材
９ 注入ポリウレタンフォーム
１０ シール部材
１１ 合板
１２ 耐火板
１３ 圧密ガラス繊維 DESCRIPTION OF SYMBOLS 1 Outer tank 2 Cold insulation material 2a Outer tank side panel part 2b Primary barrier side panel part 2b 'Polyurethane foam plug 2c Cold insulation panel 2d Surface layer barrier material 2d' Surface layer barrier material 2e Middle layer barrier material 3 Low temperature fluid 4 Metal thin plate 5 Corrugation 6 Injection Polyurethane foam 7 Consolidated glass fiber 8 Seal member 9 Injection polyurethane foam 10 Seal member 11 Plywood 12 Refractory plate 13 Consolidated glass fiber

Claims (8)

外槽と、該外槽の内面を覆うように取り付けられる保冷材と、該保冷材の内面側を覆うように取り付けられ且つ低温流体をシールする一次防壁とを備えた低温流体貯蔵タンクの保冷シール構造であって、
保冷材を二層の保冷パネルによって形成し、その一次防壁側の表層に繊維補強した樹脂コーティング材を表層バリア材として形成すると共に、前記二層の保冷パネルの中間層に繊維補強した樹脂コーティング材を中間層バリア材として形成し、前記表層バリア材と中間層バリア材とから低温流体をシールする二次防壁を構成したことを特徴とする低温流体貯蔵タンクの保冷シール構造。 A cold insulation seal for a cryogenic fluid storage tank comprising an outer tub, a cold insulation material attached to cover the inner surface of the outer tub, and a primary barrier attached to cover the inner surface side of the cold insulation material and sealing low temperature fluid Structure,
A resin coating material in which a cold insulation material is formed by a two-layer cold insulation panel, and a resin coating material reinforced with fibers on the surface layer on the primary barrier side is formed as a surface barrier material, and a fiber coating material is reinforced with an intermediate layer of the two layers of cold insulation panels. A cold insulation seal structure for a cryogenic fluid storage tank, wherein a secondary barrier is formed by sealing the low temperature fluid from the surface layer barrier material and the intermediate layer barrier material. 一次防壁を、熱伸縮を吸収するためのコルゲーションが設けられた金属薄板とした請求項１記載の低温流体貯蔵タンクの保冷シール構造。   The cold insulation structure for a cryogenic fluid storage tank according to claim 1, wherein the primary barrier is a thin metal plate provided with a corrugation for absorbing thermal expansion and contraction. 保冷パネルをポリウレタンフォームとし、二次防壁を構成する表層バリア材と中間層バリア材とを、ガラス繊維強化ポリウレタン樹脂又はガラス繊維強化エポキシ樹脂とした請求項１又は２記載の低温流体貯蔵タンクの保冷シール構造。   The cold insulation of the cryogenic fluid storage tank according to claim 1 or 2, wherein the cold insulation panel is made of polyurethane foam, and the surface layer barrier material and the intermediate layer barrier material constituting the secondary barrier are made of glass fiber reinforced polyurethane resin or glass fiber reinforced epoxy resin. Seal structure. 二層の保冷パネルの外槽側パネル部を一次防壁側パネル部より大きくしてその断面形状を凸型とし、隣接する保冷パネルの外槽側パネル部間に、注入ポリウレタンフォーム、及び／又は、圧密ガラス繊維を充填し、且つその表面をシール部材で覆うようにした請求項３記載の低温流体貯蔵タンクの保冷シール構造。   The outer tank side panel part of the two-layer cold insulation panel is made larger than the primary barrier side panel part, and the cross-sectional shape thereof is a convex shape, and between the outer tank side panel parts of the adjacent cold insulation panels, injected polyurethane foam, and / or The cold-insulating seal structure for a cryogenic fluid storage tank according to claim 3, wherein the glass fiber is filled with a compacted glass fiber and the surface thereof is covered with a seal member. 隣接する保冷パネルの一次防壁側パネル部間に、一次防壁側の表層に繊維補強した樹脂コーティング材を表層バリア材として形成したポリウレタンフォームプラグを介装すると共に、該ポリウレタンフォームプラグと前記一次防壁側パネル部との間に、注入ポリウレタンフォーム、及び／又は、圧密ガラス繊維を充填し且つその表面をシール部材で覆うようにした請求項４記載の低温流体貯蔵タンクの保冷シール構造。   A polyurethane foam plug formed as a surface barrier material with a resin coating material reinforced with a fiber on the surface layer on the primary barrier side is interposed between adjacent primary barrier side panel portions of the adjacent cold insulation panel, and the polyurethane foam plug and the primary barrier side 5. The cold insulation storage structure for a cryogenic fluid storage tank according to claim 4, wherein the polyurethane foam and / or the compacted glass fiber are filled between the panels and the surface thereof is covered with a sealing member. 一次防壁を構成する金属薄板のコルゲーションをポリウレタンフォームプラグの上に位置するよう配設すると共に、該ポリウレタンフォームプラグと前記コルゲーションとの間に合板を介在させるようにした請求項５記載の低温流体貯蔵タンクの保冷シール構造。   6. The cryogenic fluid storage according to claim 5, wherein the corrugation of the thin metal plate constituting the primary barrier is disposed on the polyurethane foam plug, and a plywood is interposed between the polyurethane foam plug and the corrugation. Cooling seal structure of the tank. 保冷パネルの一次防壁側の表面を全面に亘って耐火板で覆うようにした請求項６記載の低温流体貯蔵タンクの保冷シール構造。   The cold insulation seal structure for a cryogenic fluid storage tank according to claim 6, wherein the surface of the primary insulation wall side of the cold insulation panel is entirely covered with a fireproof plate. シール部材を繊維補強した樹脂コーティング材とした請求項４〜７いずれかに記載の低温流体貯蔵タンクの保冷シール構造。   The cold insulation storage structure for a cryogenic fluid storage tank according to any one of claims 4 to 7, wherein the sealing member is a resin coating material reinforced with fibers.
JP2004195323A 2004-07-01 2004-07-01 Cold insulation sealing structure of low-temperature fluid storage tank Pending JP2006017213A (en)

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