KR100230856B1 - Corrugated membrane structure of low temperature liquid tank - Google Patents

Corrugated membrane structure of low temperature liquid tank Download PDF

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KR100230856B1
KR100230856B1 KR1019970002837A KR19970002837A KR100230856B1 KR 100230856 B1 KR100230856 B1 KR 100230856B1 KR 1019970002837 A KR1019970002837 A KR 1019970002837A KR 19970002837 A KR19970002837 A KR 19970002837A KR 100230856 B1 KR100230856 B1 KR 100230856B1
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South Korea
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corrugation
membrane
cross
storage tank
temperature liquid
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KR1019970002837A
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Korean (ko)
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KR19980067004A (en
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김성원
이중남
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이해규
삼성중공업주식회사
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/02—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge involving reinforcing arrangements
    • F17C1/08—Integral reinforcements, e.g. ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F17C3/027—Wallpanels for so-called membrane tanks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
    • B21D13/08—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by combined methods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/21—Shaping processes
    • F17C2209/2181—Metal working processes, e.g. deep drawing, stamping or cutting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/013—Reducing manufacturing time or effort

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

1. 청구범위에 기재된 발명이 속한 기술분야1. TECHNICAL FIELD OF THE INVENTION

본 발명은 저온액체를 저장하는 탱크의 내벽에 부착하여, 액체 혹은 기체의 기밀성 유지 및 온도편차에 따른 수축 및 팽창을 흡수하는 기능을 수행하는 멤브레인 코러게이션(Corrugated Membrane) 구조에 관한 것이다.The present invention relates to a membrane corrugation (Corrugated Membrane) structure that is attached to the inner wall of the tank for storing the low-temperature liquid, and performs the function of maintaining the airtightness of the liquid or gas and absorb the shrinkage and expansion due to the temperature deviation.

2. 발명이 해결하려고 하는 기술적 과제2. The technical problem to be solved by the invention

온도편차에 따른 수축과 팽창을 작은 응력상태를 유지하면서 안정적으로 흡수할 수 있는 멤브레인 코러게이션(Corrugated Mambrane) 구조의 제공.Provides a corrugated membrane structure that can reliably absorb shrinkage and expansion due to temperature deviation while maintaining a small stress state.

3. 발명의 해결방법의 요지3. Summary of Solution to Invention

단면이 부드러운 곡선과 직선으로 형성된 단일코러게이션(Single Corrugation)과 십자형 코러게이션(Cross Corrugation)을 갖도록 하여 모든 방향으로 변형이 가능하도록 멤브레인 코러게이션을 형성함.Membrane corrugation is formed to allow deformation in all directions by having single corrugation and cross corrugation formed in smooth curves and straight lines.

4. 발명의 중요한 용도4. Important uses of the invention

본 발명은 저온액체를 저장하는 저장탱크의 내벽에 설치하여 저장탱크의 안정성을 도모할 수 있다.The present invention can be installed on the inner wall of the storage tank for storing the low-temperature liquid can achieve the stability of the storage tank.

Description

저온액체 저장탱크의 멤브레인 코러게이션 구조Membrane Corrugation Structure of Low Temperature Liquid Storage Tank

본 발명은 저온액체를 저장하는 탱크의 내벽에 부착하여, 액체 혹은 기체의 기밀성 유지 및 온도편차에 따른 수축 및 팽창을 흡수하는 기능을 수행하는 저온액체 저장탱크의 멤브레인 코러게이션(Corrugated Membrane) 구조에 관한 것이다.The present invention is attached to the inner wall of the tank for storing the low-temperature liquid, to the membrane corrugated structure (Corrugated Membrane) structure of the low-temperature liquid storage tank that performs the function of maintaining the airtightness of the liquid or gas and absorb the shrinkage and expansion according to the temperature deviation It is about.

종래에는 액화천연가스(LNG) 등과 같은 극저온 액체를 저장하는 탱크는 탱크의 내벽에 제1도에서와 같은 멤브레인(Membrane)을 설치하였다.Conventionally, a tank for storing cryogenic liquids, such as LNG, is provided with a membrane as shown in FIG. 1 on the inner wall of the tank.

저온액체 저장탱크는 저장액체의 주입과 송출을 반복하는 기능을 가져야하므로 액체의 주입시 저온액체와 접촉하는 영역은 온도 하강에 기인하여 수축하며 액체의 송출 혹은 저장탱크의 보수시에 저온액체와 접촉했던 영역은 온도 상승에 기인하여 다시 팽창한다. 또한 저장액체의 수두에 의해서 표면에 압력이 작용한다.The low temperature liquid storage tank should have the function of repeating the injection and delivery of the storage liquid. Therefore, the area in contact with the low temperature liquid during the injection of the liquid contracts due to the temperature drop and the contact with the low temperature liquid when the liquid is discharged or the storage tank is repaired. The area that has been expanded expands again due to the temperature rise. In addition, pressure is applied to the surface by the head of the storage liquid.

따라서 저온액체를 저장하거나 저온액체와 접촉하는 탱크내벽에 제1도와 같은 코러게이션(Corrugation)을 갖는 멤브레인(Membrane)을 미리 설치하여 온도편차에 의한 수축과 팽창을 흡수한다.Therefore, a membrane having a corrugation as shown in FIG. 1 is pre-installed in the tank inner wall in which the low temperature liquid is stored or in contact with the low temperature liquid, thereby absorbing shrinkage and expansion due to temperature deviation.

이러한 온도편차에 따른 수축 및 팽창량의 크기는 제1(a)도에서 보는 것처럼 종방향의 피치(1)와 횡방향의 피치(2)의 크기에 따라 의존한다.The amount of shrinkage and expansion according to the temperature deviation depends on the size of the pitch 1 in the longitudinal direction and the pitch 2 in the transverse direction as shown in FIG. 1 (a).

종래에 사용되는 멤브레인 코러게이션의 형상중의 하나인 제1(b)도에 있어서, 모서리부분(3) 및 45°경사부분(4)에서 온도편차에 의한 수축과 팽창시 매우 큰 열응력이 발생한다. 상기 모서리부분(3)에서는 구조상으로 곡율크기가 작으면서 예리한 모서리가 존재하여 굽힘응력의 영향을 크게 받기 때문에 모서리효과(Corner Effect)에 의한 응력집중이 일어난다.In FIG. 1 (b), which is one of the shapes of membrane corrugation used in the related art, a very large thermal stress is generated during contraction and expansion due to temperature deviation in the corner portion 3 and the 45 ° inclination portion 4. do. In the corner portion 3, since the curvature has a small curvature in the structure and is sharply influenced by the bending stress, stress concentration due to the corner effect occurs.

상기 45°경사부분(4)에서는 온도편차에 의한 구조물의 팽창은 모든 방향으로 동시에 발생하게 되는데 상기 45°경사부분(4)에서는 45°방향으로의 팽창을 흡수할 수 있는 코러게이션 영역이 없으며 부재자체의 변형에 의하여 수축 및 팽창을 흡수해야 한다. 따라서 부재 자체의 변형시 반경방향 및 접선방향으로 매우 큰 응력을 유발한다. 또한 제1(b)도의 기존 코러게이션 형상은 성형시 다단계공정이 필요하게 되어 제조공정이 복잡하고 시간이 많이 걸리게 되는 문제점을 또한 갖는다.In the 45 ° inclined portion 4, the expansion of the structure due to the temperature deviation occurs simultaneously in all directions. In the 45 ° inclined portion 4, there is no corrugation area that can absorb the expansion in the 45 ° direction. It must absorb its shrinkage and expansion by its deformation. Therefore, deformation of the member itself causes very large stresses in the radial and tangential directions. In addition, the existing corrugation shape of Figure 1 (b) also has a problem that the manufacturing process is complicated and time-consuming because a multi-step process is required during molding.

종래의 코러게이션 형상중의 하나인 제1(c)도에서는 온도편차에 의한 부재의 수축과 팽창시 굴곡부(5)에서 작은 곡율에 기인하여 큰 굽힘응력이 발생한다. 또한 다른 코러게이션 형상중의 하나인 제1(d)도에서 보는 바와 같은 링형 코러게이션의 링부분(6)에서 반경방향으로 팽창시 이에 따른 접선방향으로 팽창이 동시에 발생해야 하므로 매우 큰 접선응력이 발생하여 불안정한 구조이다.In FIG. 1 (c), which is one of the conventional corrugation shapes, a large bending stress occurs due to a small curvature in the bent portion 5 during contraction and expansion of the member due to temperature deviation. In addition, when expanding in the radial direction in the ring portion 6 of the ring-shaped corrugation as shown in FIG. 1 (d) which is one of the other corrugation shapes, the tangential stress is generated at the same time. By unstable structure.

따라서 이와 같은 종래의 코러게이션 구조는 큰 접선응력과 굽힘응력이 발생하여 멤브레인의 안정성이 저하된다는 문제점을 갖고 있다.Therefore, such a conventional corrugation structure has a problem that a large tangential stress and bending stress is generated to reduce the stability of the membrane.

본 발명은 상기와 같은 종래의 맴브레인 코러게이션 구조가 갖는 문제점을 해결하기 위해서 안출한 것으로서, 제작이 용이하고 온도편차에 따른 수축 및 팽창량을 부재에 작은 응력 상태를 유지하면서 흡수할 수 있는 강도적으로 신뢰성을 높인 맴브레인 코러게이션 구조의 제공을 그 목적으로 한다.The present invention has been made in order to solve the problems of the conventional membrane corrugation structure as described above, easy to manufacture and the strength that can absorb the shrinkage and expansion amount according to the temperature deviation while maintaining a small stress state in the member The purpose of the present invention is to provide a membrane corrugation structure with improved reliability.

이와 같은 목적은 단일 코러게이션과 십자형 코러게이션과 평탄부로 구성된 본 발명의 코러게이션 구조로써 달성될 수 있는 바, 첨부도면을 참조로 하여 이하에 상세히 설명한다.This object can be achieved with the corrugation structure of the present invention consisting of a single corrugation, cross-shaped corrugation and a flat portion, which will be described in detail below with reference to the accompanying drawings.

제1(a),(b),(c),(d)도는 종래의 멤브레인 코러게이션의 사시도.1 (a), (b), (c) and (d) are perspective views of a conventional membrane corrugation.

제2도는 본 발명의 바람직한 실시예에 따른 사시도.2 is a perspective view according to a preferred embodiment of the present invention.

제3도는 본 발명의 다른 실시예에 따른 사시도.3 is a perspective view according to another embodiment of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

1 : 종방향의 피치 2 : 횡방향의 피치1: longitudinal pitch 2: transverse pitch

3 : 모서리부분 4 : 45°경사부분3: corner 4: 45 ° slant

5 : 굴곡부 6 : 링부분5: bend portion 6: ring portion

11 : 단일코러게이션 12 : 십자형 코러게이션11: single corrugation 12: cross corrugation

13 : 평탄부 14 : 오목부13 flat part 14 recessed part

15 : 볼록부 17 : 직선부15: convex 17: straight

제2도는 본 발명의 바람직한 실시예에 따른 사시도로서, 상기 제1도에서 보는 바와 같이 본 발명에 따른 멤브레인 코러게이션의 구조는 맴브레인에 직교방향으로 형성된 단일 코러게이션(Single Corrugation)(11)과, 상기 단일 코러게이션(11)의 직교하는 위치에 형성되는 십자형 코러게이션(Cross Corrugation)(12)과, 코러게이션이 없는 평탄부(13)로 구성된다.2 is a perspective view according to a preferred embodiment of the present invention, as shown in FIG. 1, the structure of the membrane corrugation according to the present invention comprises a single corrugation (Single Corrugation 11) formed in a direction perpendicular to the membrane; Cross corrugation 12 formed at orthogonal positions of the single corrugation 11 and a flat portion 13 without corrugation.

상기 단일코러게이션(11)은 그 단면형상이 양쪽에서 오목하게 올라가다가 상부에서 볼록하게 만나는 이중라운드형상으로 되어있으며, 길이방향으로 직선으로 뻗어있는 형상이다. 또한 상기 단일 코러게이션(11)은 서로 직교하는 부분에서 서로 만나지 않도록 이격되어 끝나게 되며 이 끝단은 라운딩되어 있다.The single corrugation 11 has a double round shape in which its cross-sectional shape rises concave on both sides and meets convexly at the top thereof, and extends in a straight line in the longitudinal direction. In addition, the single corrugation 11 is spaced apart so that they do not meet each other at orthogonal portions, and the ends are rounded.

상기에서 단일코러게이션(11)의 단면형상은 상기의 이중 라운드 형상외에도 상기 이중 라운드 중간에서 연장되는 직선부를 갖도록 하는 변형도 가능하다.In the above, the cross-sectional shape of the single corrugation 11 may be modified to have a straight portion extending in the middle of the double round in addition to the double round shape.

상기 단일 코러게이션(11)의 직교부에 위치하게 되는 십자형 코러게이션(12)은 전체가 단일 코러게이션(11)을 십자형으로 굴곡시킨 모양을 갖는다.The cross-shaped corrugation 12 located at the orthogonal portion of the single corrugation 11 has a shape in which the entire single corrugation 11 is bent in a cross shape.

직교하는 단일코러게이션(11)의 방향을 X,Y로 잡으면, 직교방향으로 끝나는 각 단일코러게이션의 끝단부 사이 45°방향으로 십자형 코러게이션(12)의 바깥단인 볼록부(15)가 형성되고, 상기 4개의 볼록부(15)가 각각 안쪽으로 들어오면서 만나는 오목부(14)가 라운드져서 단일 코러게이션(11)의 각각의 단부 바깥쪽에 형성되며, 상기 볼록부(15)와 오목부(14) 사이는 직선부(17)를 이루며 상기 직선부(17)는 단일코러게이션이 이중으로 병설된 형상을 취하고 있다.When the direction of the orthogonal single corrugation 11 is set to X and Y, the convex portion 15, which is the outer end of the cross-shaped corrugation 12 in the 45 ° direction between the end portions of each single corrugation ending in the orthogonal direction, is formed. The four convex portions 15 are formed to be rounded to form the outer side of each end of the single corrugation 11. 14) a straight portion 17 is formed between the straight portions 17 has a shape in which a single corrugation is provided in parallel.

상기 십자형 코러게이션(12)의 안쪽부(16)는 탱크의 벽 쪽으로 오목하게 들어가 저장탱크의 안쪽 벽면과 접촉하도록 구성된다.The inner portion 16 of the cruciform corrugation 12 is configured to recess into the wall of the tank and to contact the inner wall of the storage tank.

상기 십자형 코러게이션(12)의 볼록부(15)는 상기 제2도에서와 같이 단일 코러게이션과 45°방향을 이루면서 길게 튀어나와 있는 구조를 취하고 있다.The convex portion 15 of the cruciform corrugation 12 has a structure that protrudes long in a 45 ° direction with the single corrugation as shown in FIG.

본 발명의 다른 변형예로서, 제3도와 같이 직선부 없이 볼록부(15)가 오목부(14)와 직접 연결되도록 구성할 수도 있다.As another modification of the present invention, as shown in FIG. 3, the convex portion 15 may be configured to be directly connected to the concave portion 14 without a straight portion.

상기와 같은 구성을 통한 본 발명의 작용을 제2도를 통하여 설명하면 다음과 같다.Referring to the operation of the present invention through the configuration as described above with reference to FIG.

저온액체 저장탱크는 주입 및 송출기능을 반복하게되며 따라서 저장탱크 내벽에 부착되어 액체와 직접 접촉하는 맴브레인은 액체의 주입과 송출 및 보수에 따른 온도상승과 온도하강에 기인하여 수축 및 팽창을 반복한다.The low temperature liquid storage tank repeats the injection and dispensing functions. Therefore, the membrane attached to the inner wall of the storage tank and directly contacting the liquid repeats contraction and expansion due to the temperature rise and temperature drop due to the liquid injection, discharge and repair. .

이러한 수축과 팽창을 작은 응력상태를 유지하면서 흡수할 수 있는 멤브레인 코러게이션 구조는 탱크의 안정성 및 신뢰성에 영향을 미치는 중요한 요소이다. 특히 온도편차에 의한 부재의 수축 및 팽창은 모든 방향으로 동시에 발생하기 때문에 모든 방향으로 신축이 가능한 구조가 되어야 한다.The membrane corrugation structure that can absorb such shrinkage and expansion while maintaining a small stress state is an important factor affecting the stability and reliability of the tank. In particular, the contraction and expansion of the member due to the temperature deviation occurs simultaneously in all directions, so it must be a structure capable of stretching in all directions.

본 발명의 코러게이션 구조는 모든 방향으로 수축과 팽창이 가능하도록 되어있다.The corrugated structure of the present invention is capable of contraction and expansion in all directions.

본 발명은 온도하강에 의하여 X방향 혹은 Y방향으로 부재가 수축되면 미리 휘어진 오목부(14)가 퍼지면서 수축에 대응한다. 이때 볼록부(15)는 반대방향으로 휘어지며 오목부(14)의 변형에 대응한다. 따라서 최대응력은 볼록부(15) 종단에서 발생이 예상되나 해석결과로 부터 기존 멤브레인 코러게이션에 비하여 약 2/3배로 작은 것을 확인하였다.According to the present invention, when the member contracts in the X direction or the Y direction due to the temperature drop, the concave portion 14 which is bent in advance spreads and corresponds to the contraction. At this time, the convex portion 15 is bent in the opposite direction and corresponds to the deformation of the concave portion 14. Therefore, the maximum stress is expected to occur at the end of the convex portion 15, but from the analysis results, it was confirmed that it is about 2/3 times smaller than the conventional membrane corrugation.

또한 다른 예로 X,Y방향에 대하여 45°경사진 방향에 대해서는 본 발명의 직선부(17) 및 단일 코러게이션(11)의 직선부의 신축에 의하여 온도편차에 따른 수축량을 흡수하는 기능을 수행한다.As another example, in the direction inclined at 45 ° to the X and Y directions, the contraction portion absorbs the amount of shrinkage due to the temperature deviation by the expansion and contraction of the linear portion 17 and the linear portion of the single corrugation 11 of the present invention.

상기에서와 같이 본 발명은 기존의 멤브레인 코러게이션의 구조를 획기적으로 개선하여 단일 코러게이션과 십자형 코러게이션을 갖도록 하여 모든 방향으로 신축이 가능하여 온도 변화에 따른 멤브레인의 변형을 안정적으로 흡수하여 저장탱크의 파손을 방지하여 저장탱크의 내구성을 높일 수 있게된다.As described above, the present invention significantly improves the structure of the existing membrane corrugation to have a single corrugation and cross-shaped corrugation to be stretchable in all directions to stably absorb the deformation of the membrane according to the temperature change to the storage tank By preventing the breakage of the storage tank can be increased.

그리고 본 발명에 따른 단일 코러게이션과 십자형 코러게이션은 모두 큰 곡률을 갖도록 하여 응력집중을 방지하였다.In addition, both the single corrugation and the cross corrugation according to the present invention have a large curvature to prevent stress concentration.

또한 본 발명에 따른 멤브레인의 코러게이션은 프레스 가공 등의 간단한 가공으로써 성형이 가능하므로 제작비용을 절감할 수 있는 효과도 갖게된다.In addition, since the corrugation of the membrane according to the present invention can be molded by a simple process such as press working, it also has an effect of reducing the manufacturing cost.

Claims (1)

맴브레인에 직교방향으로 형성되는 단일코러게이션(11)과, 상기 단일코러게이션(11)의 직교하는 위치에 형성되며 전체가 상기 단일코러게이션을 십자형으로 굴곡시켜놓은 모양을 취하며 볼록부(15)와 오목부(14) 및 직선부(17)로 구성되는 십자형 코러게이션(12)과, 코러게이션이 없는 평탄부(13)로 구성되는 저온액체 저장탱크의 멤브레인 코러게이션 구조에 있어서, 단일코러게이션(11)은 그 단면이 양쪽에서 오목하게 올라가다가 상부에서 볼록하게 만나는 이중 라운드 형상을 이루고, 상기 십자형 코러게이션(12)은 직선부(17) 없이 볼록부(15)와 오목부(14)가 직접 연접하도록 구성된 것을 특징으로 하는 저온액체 저장탱크의 멤브레인 코러게이션 구조.The single corrugation 11 is formed at the orthogonal direction to the membrane, and is formed at the orthogonal position of the single corrugation 11, and the convex part 15 takes a shape in which the single corrugation is bent in a cross shape. In the membrane corrugation structure of a cryogenic liquid storage tank composed of a cross-shaped corrugation 12 composed of a concave portion 14 and a straight portion 17 and a flat portion 13 having no corrugation, a single corrugation structure is provided. (11) has a double round shape in which its cross section rises concave on both sides and meets convexly at the top, and the cross-shaped corrugation (12) has a convex portion (15) and a concave portion (14) without a straight portion (17). Membrane corrugation structure of a low temperature liquid storage tank, characterized in that the direct connection.
KR1019970002837A 1997-01-30 1997-01-30 Corrugated membrane structure of low temperature liquid tank KR100230856B1 (en)

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