WO2008072893A1 - Upper structure of cargo tank in lngc - Google Patents

Upper structure of cargo tank in lngc Download PDF

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Publication number
WO2008072893A1
WO2008072893A1 PCT/KR2007/006468 KR2007006468W WO2008072893A1 WO 2008072893 A1 WO2008072893 A1 WO 2008072893A1 KR 2007006468 W KR2007006468 W KR 2007006468W WO 2008072893 A1 WO2008072893 A1 WO 2008072893A1
Authority
WO
WIPO (PCT)
Prior art keywords
deck
trunk
cargo tank
inner deck
upper structure
Prior art date
Application number
PCT/KR2007/006468
Other languages
French (fr)
Inventor
Byeong-Seog Kang
Hyun-Kun Kim
Seung-June Lee
Do-Sung Kong
Jong-Woo Park
Jae-Woo Chung
Sung-Gi An
Jong-Jin Park
Original Assignee
Samsung Heavy Ind. Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Samsung Heavy Ind. Co., Ltd. filed Critical Samsung Heavy Ind. Co., Ltd.
Priority to EP07851439.5A priority Critical patent/EP2089267B1/en
Priority to CN2007800461383A priority patent/CN101583533B/en
Publication of WO2008072893A1 publication Critical patent/WO2008072893A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/48—Decks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B2025/087—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid comprising self-contained tanks installed in the ship structure as separate units
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0146—Two-phase
    • F17C2225/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2225/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • 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
    • F17C2260/016—Preventing slosh
    • 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
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

Definitions

  • the trunk deck 17 formed in the conventional cargo tank of the LNGC does not have a sufficient upper area, so necessary pipes need to be arranged in a multilayer structure. Accordingly, there are many difficulties in performing works such as maintenance, repair, a sealing test (e.g. hydro test), etc.
  • an upper structure of a cargo tank in an LNGC comprising: an inner deck, both ends of which are connected to the upper ends of inner inclined plates extending from inner side plates respectively; a trunk deck spaced apart from the inner deck above the inner deck and extending further to the right and to the left than the inner deck by a predetermined length respectively; trunk inclined section, ends of which are connected to both ends of the trunk deck and the other ends of which are located on right and left horizontal extension lines of the inner deck; and inner deck extensions extending from both ends of the inner deck to the trunk inclined sections respectively.
  • the inner deck, the trunk deck, the trunk inclined sections, and the inner deck extensions form a rectangular box-shaped structure.
  • the width of the inner deck is reduced to a minimal requirement range required by pipes and cargo systems that can be mounted to the upper and lower surfaces of the inner deck or can penetrate the inner deck.
  • the inclination angle of the trunk inclined sections may be ninety degrees downward with respect to the trunk deck.
  • a liquid dome opening may be deviated from the longitudinal center line and may be eccentrically disposed on the upper surface of the trunk deck.
  • the arrangement can maintain the continuity of the center girder installed on the longitudinal center line of the trunk deck, thereby enhancing the longitudinal strength of the hull.
  • the sloshing load in the cargo tank can be minimized.
  • the uppermost area of the trunk deck and the lower space of the horizontal trunk deck is so sufficient that various equipments such as the passage assembly including the pipes, the cables, and the passages can be easily disposed.
  • the liquid dome opening is deviated from the center girder so that the longitudinal strength of the hull can be enhanced.
  • FIG. 1 is a concept view illustrating a conventional cargo tank in an LNGC
  • FIG. 3 is an arrangement view illustrating the position of a liquid dome opening installed in the upper structure of the cargo tank in the LNGC of FIG. 1 ;
  • FIG. 5 is an arrangement view illustrating the position of a liquid dome opening installed in the upper structure of the cargo tank in the LNGC of FIG. 4;
  • FIG. 6 is a concept view for comparing the width of an inner deck of the upper structure of the cargo tank in the LNGC according to the present invention with that of an inner deck of the conventional upper structure of the cargo tank in the LNGC of FIG. 1. Best Mode for Carrying Out the Invention
  • An inner deck 108 is connected to ends of inner inclined plates 11 extending from the inner side plates 7 and a trunk deck 102 extending further to the right and to the left than the inner deck 108 is located above the inner deck 108.
  • Inclined trunk sections 104 obliquely extend from the right and left ends of the trunk deck 102 to a horizontal extension line of the inner deck 108.
  • inner deck extensions 106 horizontally extend from both ends of the inner deck 108 to the lower ends of the inclined trunk section 104.
  • the trunk deck 102, the inclined trunk section 104, the inner deck extensions 106, and the inner deck 108 are connected to each other to form the upper structure of the cargo tank in the shape of a rectangular box.
  • the rectangular box- shaped upper structure of the cargo tank is connected to the upper ends of the inner inclined plates 11 and the outer inclined plates 13.
  • the width of the inner deck 108 is reduced to a minimally required width range (also, referred to as "minimal requirement range") required by pipes and cargo systems that can be mounted on the upper and lower surfaces of the inner deck 108 or passing through the inner deck 108, in order to minimize the sloshing load by reducing the free surface of the liquefied natural gas in the cargo tank.
  • FIG. 6 is a concept view for comparing the width of an inner deck of the upper structure of the cargo tank in the LNGC according to the present invention with that of an inner deck of the conventional upper structure of the cargo tank. Referring to FIG.
  • Passage assemblies 110 are positioned on the flat upper surface of the inner deck extensions respectively.
  • the passage assemblies 110 refer to passage structures including pipes, pipe supports for supporting the pipes, cables, cableways for arranging the cables, and passages through which workers pass.
  • the upper structure of the cargo tank according to the embodiment of the present invention has a wide interior space as compared with the conventional upper structure of the cargo tank illustrated in FIG. 2. Further, as a flat bottom surface is provided in the interior space, the passage assemblies 110 can be easily positioned even without using the conventional support members 62. Moreover, since the upper surfaces of the inner deck extensions 106 are flat, steel gratings that have been used as the bottom surface of the passage may not need to be manufactured.
  • the trunk deck 102 Due to the geometric characteristics of the rectangular box-shaped structure to which the inner deck extensions 106 are added, the trunk deck 102 according to the embodiment of the present invention has a wide uppermost area as compared with the conventional trunk deck 17 illustrated in FIG. 2.
  • the widthwise length of the trunk deck 102 is the sum of the widthwise length of the inner deck 108 and the widthwise lengths of the two inner deck extensions 106.
  • the pipes can be arranged not in the conventional multilayer structure 70 illustrated in FIG. 2 but in a single structure 112. The arrangement provides a convenience in performing maintenance and repair of the pipes and a sealing test work such as a hydro test.
  • a plurality of reinforcing members referred to girders can be used in the trunk deck
  • the girders include a center girder and side girders.
  • the center girder is installed on the longitudinal center line of the trunk deck 102 and the side girders are disposed in parallel to each other on both sides of the center girder.
  • the center girder and the side girders are members for enhancing the longitudinal strength of the hull.
  • the uppermost area of the conventional trunk deck 17 illustrated in FIGS. 2 and 3 is so narrow that the liquid dome opening 50 must intrude into the center girder of the trunk deck 17. Because of the arrangement, the continuity of the center girder is partially interrupted and the longitudinal strength of the hull decreases. However, since the trunk deck 102 according to the embodiment of the present invention that is illustrated in FIGS. 4 and 5 has a wider uppermost area as compared with the conventional trunk deck 17, the liquid dome opening 50 can be arranged not to intrude the longitudinal center line and can be disposed between the center girder and one of the side girders. This arrangement maintains the continuity of the center girder, thereby increasing the longitudinal strength of the hull. Additionally, it also increases the torsional rigidity of the hull.
  • the sloshing load in the cargo tank can be minimized.
  • the uppermost area of the trunk deck and the lower space of the horizontal trunk deck is so sufficient that various equipments such as the passage assembly including the pipes, the cables, and the passages can be easily disposed.
  • the liquid dome opening is deviated from the center girder so that the longitudinal strength of the hull can be enhanced.
  • the wide uppermost area of the trunk deck as compared with the conventional one allows the arrangement of the pipes in a single layer structure, thereby providing a convenience in performing installation, maintenance, and repair of the pipes as well as various tests (e.g. hydro test).

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

Disclosed is an upper structure of a cargo tank in an LNGC. The upper structure of the cargo tank in an LNGC includes an inner deck, both ends of which are connected to the upper ends of inner inclined plates extending from inner side plates respectively, a trunk deck spaced apart from the inner deck above the inner deck and extending further to the right and to the left than the inner deck by a predetermined length respectively, trunk inclined section ends of which are connected to both ends of the trunk deck and the other ends of which are located on right and left horizontal extension lines of the inner deck, and inner deck extensions extending from both ends of the inner deck to the trunk inclined sections respectively.

Description

Description UPPER STRUCTURE OF CARGO TANK IN LNGC
Technical Field
[1] The present invention relates to an upper structure of a cargo tank in an LNGC, and more particularly to an upper structure of a cargo tank in an LNGC capable of increasing the longitudinal strength of a hull while minimizing the sloshing load in the interior of the cargo tank and of allowing easy installation of various equipment and passages. Background Art
[2] In general, natural gas is carried by a liquefied natural gas carrier (hereinafter, referred to as LNGC) because of the transportation cost thereof. Meanwhile, since more natural gas can be carried at once by carrying the natural gas in a liquefied state than in a gaseous state, the natural gas is liquefied at an ultra-low temperature to be carried. The natural gas liquefied for the above-mentioned purpose is called liquefied natural gas.
[3] When liquefied natural gas is carried by an LNGC, a sloshing load problem critically influencing a hull occurs in a cargo tank in the LNGC. Sloshing is a phenomenon in which the free surface of a fluid in a tank is fluctuated by the vibration of the tank such that the fluid impacts on wall surfaces of the tank.
[4] A need for an improved cargo tank structure of an LNGC capable of minimizing the sloshing phenomenon has been requested because the sloshing load can critically influence the structural stability of the hull of the LNGC.
[5] FIG. 1 is a concept view illustrating a conventional cargo tank in an LNGC.
Referring to FIG. 1, the transverse cross-section of a membrane type cargo tank is schematically illustrated. First, referring to FIG. 1, there is provided a double plate type cargo tank including a double bottom plate 3 forming the bottom of the cargo tank, double inclined sections 5 obliquely extending toward the outer upper side of the double bottom plate 3, inner side plates 7 and outer side plates 9 vertically extending upward from the double inclined sections 5 to form the side walls of the cargo tank, inner inclined plates 11 and outer inclined plates 13 obliquely extending toward the inner upper sides of the inner side plates 7 and the outer side plate 9 respectively, and an upper structure A connected to the inner inclined plates 11 and the outer inclined plates 13.
[6] FIG. 2 is a concept view illustrating the upper structure of the conventional cargo tank of the LNGC of FIG. 1. Referring to FIG. 2, the upper structure of the cargo tank includes a conventional inner deck 15 horizontally connected to both ends of the inner inclined plates 11 and a trunk deck 17 spaced upwardly apart from the conventional inner deck 15 and horizontally connected to both ends of the outer inclined plates 13.
[7] In the conventional upper structure of the cargo tank in the LNGC, a sole method for reducing the sloshing load is to restrict the size (e.g. width or length) of the cargo tank. However, according to this method, it is necessary to increase the number of cargo tanks in order to carry more liquefied natural gas.
[8] Meanwhile, various pipes, pipe supports, cables, cableways, and passages 60 are conventionally installed between the inner inclined plate 11 and the outer inclined plate 13 of the cargo tank. Since the installation spaces are generally narrow and inclined, various support members 62 are inconveniently required to the upper structure of the cargo tank.
[9] Moreover, the trunk deck 17 formed in the conventional cargo tank of the LNGC does not have a sufficient upper area, so necessary pipes need to be arranged in a multilayer structure. Accordingly, there are many difficulties in performing works such as maintenance, repair, a sealing test (e.g. hydro test), etc.
[10] The conventional cargo tank in an LNGC also has a problem in the longitudinal strength of the hull thereof. FIG. 3 is an arrangement view illustrating the position of a liquid dome opening installed in the conventional upper structure of the cargo tank in the LNGC. Referring to FIG. 3, a liquid dome opening 50 is disposed on the conventional trunk deck. Here, the liquid dome opening 50 is equipment functioning as a sort of an entrance for cargo for supplying liquefied natural gas into the cargo tank or withdrawing the liquefied natural gas from the cargo tank. Various pipes are installed in the liquid dome opening 50.
[11] A center girder is installed on the longitudinal center line of the trunk deck 17 and side girders are disposed in parallel to each other and are spaced apart from the center line to the right and left sides. The center girder and the side girders are reinforcing members for maintaining the longitudinal strength of the hull.
[12] However, the liquid dome opening 50 disposed in the conventional trunk deck 17 intrudes into a portion of the center girder, which causes a problem in the longitudinal strength of the hull. Disclosure of Invention Technical Problem
[13] Therefore, the present invention has been made in view of the above problems, and it is an aspect of the present invention to provide an upper structure of a cargo tank in an LNGC capable of reducing a sloshing load that can be generated in the interior of the cargo tank, of easily installing various equipments and passages, and of maintaining the continuity of a center girder installed on a trunk deck. Technical Solution
[14] In order to achieve the aspect, there is provided an upper structure of a cargo tank in an LNGC comprising: an inner deck, both ends of which are connected to the upper ends of inner inclined plates extending from inner side plates respectively; a trunk deck spaced apart from the inner deck above the inner deck and extending further to the right and to the left than the inner deck by a predetermined length respectively; trunk inclined section, ends of which are connected to both ends of the trunk deck and the other ends of which are located on right and left horizontal extension lines of the inner deck; and inner deck extensions extending from both ends of the inner deck to the trunk inclined sections respectively.
[15] Preferably, the inner deck, the trunk deck, the trunk inclined sections, and the inner deck extensions form a rectangular box-shaped structure.
[16] Preferably, the width of the inner deck is reduced to a minimal requirement range required by pipes and cargo systems that can be mounted to the upper and lower surfaces of the inner deck or can penetrate the inner deck.
[17] Preferably, the inclination angle of the trunk inclined sections may be ninety degrees downward with respect to the trunk deck.
[18] Then, passage assemblies including pipes, pipe supports, cables, cableways, and passages may be positioned on the upper surface of the inner deck extensions respectively without using any separate support member.
[19] Preferably, a liquid dome opening may be deviated from the longitudinal center line and may be eccentrically disposed on the upper surface of the trunk deck. The arrangement can maintain the continuity of the center girder installed on the longitudinal center line of the trunk deck, thereby enhancing the longitudinal strength of the hull.
Advantageous Effects
[20] In the upper structure of the cargo tank in the LNGC according to the embodiment of the present invention, as the width of the inner deck is reduced to the minimal requirement range, the sloshing load in the cargo tank can be minimized. Further, due to the geometric characteristics of the rectangular box-shaped structure, the uppermost area of the trunk deck and the lower space of the horizontal trunk deck is so sufficient that various equipments such as the passage assembly including the pipes, the cables, and the passages can be easily disposed. Furthermore, the liquid dome opening is deviated from the center girder so that the longitudinal strength of the hull can be enhanced.
[21] In addition, in the upper structure of the cargo tank in the LNGC according to the embodiment of the present invention, since the passage assemblies can be simply positioned on the upper surfaces of the inner deck extensions, the separate support members installed in the conventional inclined spaces are unnecessary and the steel grating (about 200 M) used as the bottom surface of the passage is also unnecessary, thereby reducing the ship construction cost by shortening the work time and reducing the work cost.
[22] Moreover, in the upper structure of the cargo tank in the LNGC according to the embodiment of the present invention, the wide uppermost area of the trunk deck as compared with the conventional one allows the arrangement of the pipes in a single layer structure, thereby providing a convenience in performing installation, maintenance, and repair of the pipes as well as various tests (e.g. hydro test). Brief Description of the Drawings
[23] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
[24] FIG. 1 is a concept view illustrating a conventional cargo tank in an LNGC;
[25] FIG. 2 is a concept view illustrating an upper structure of the conventional cargo tank in the LNGC of FIG. 1;
[26] FIG. 3 is an arrangement view illustrating the position of a liquid dome opening installed in the upper structure of the cargo tank in the LNGC of FIG. 1 ;
[27] FIG. 4 is a concept view illustrating an upper structure of a cargo tank in an LNGC according to an embodiment of the present invention;
[28] FIG. 5 is an arrangement view illustrating the position of a liquid dome opening installed in the upper structure of the cargo tank in the LNGC of FIG. 4; and
[29] FIG. 6 is a concept view for comparing the width of an inner deck of the upper structure of the cargo tank in the LNGC according to the present invention with that of an inner deck of the conventional upper structure of the cargo tank in the LNGC of FIG. 1. Best Mode for Carrying Out the Invention
[30] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.
[31] FIG. 4 is a concept view illustrating an upper structure of a cargo tank in an LNGC according to an embodiment of the present invention. FIG. 5 is a view illustrating the position of a liquid dome opening installed in the upper structure of the cargo tank in the LNGC of FIG. 4.
[32] In FIGS. 4 and 5, the upper structure of a cargo tank in an LNGC is illustrated but the middle and lower structure of the membrane type cargo tank illustrated in FIG. 1 is not illustrated, the middle and lower structure including a double bottom plate 3 forming the bottom of the cargo tank, double inclined sections 5 obliquely extending toward the outer upper side of the double bottom plates 3, inner side plates 7 and outer side plates 9 vertically extending upward from the double inclined sections 5 to form the side walls of the cargo tank.
[33] An inner deck 108 according to the embodiment of the present invention is connected to ends of inner inclined plates 11 extending from the inner side plates 7 and a trunk deck 102 extending further to the right and to the left than the inner deck 108 is located above the inner deck 108. Inclined trunk sections 104 obliquely extend from the right and left ends of the trunk deck 102 to a horizontal extension line of the inner deck 108.
[34] In the embodiment of the present invention, the inclined trunk sections 104 are inclined by ninety degrees with respect to the trunk deck 102. Accordingly, knuckle point 114 is formed at each of both ends of the inclined trunk sections 104 such that a space for equipment is easily secured. As long as the inclination angle of the inclined trunk section 104 is larger than that of the inner inclined plates 11 or the outer inclined plates 13, it can be variously determined.
[35] Further, inner deck extensions 106 horizontally extend from both ends of the inner deck 108 to the lower ends of the inclined trunk section 104. In the embodiment of the present invention, the trunk deck 102, the inclined trunk section 104, the inner deck extensions 106, and the inner deck 108 are connected to each other to form the upper structure of the cargo tank in the shape of a rectangular box. The rectangular box- shaped upper structure of the cargo tank is connected to the upper ends of the inner inclined plates 11 and the outer inclined plates 13.
[36] Here, it is preferable that the width of the inner deck 108 is reduced to a minimally required width range (also, referred to as "minimal requirement range") required by pipes and cargo systems that can be mounted on the upper and lower surfaces of the inner deck 108 or passing through the inner deck 108, in order to minimize the sloshing load by reducing the free surface of the liquefied natural gas in the cargo tank. FIG. 6 is a concept view for comparing the width of an inner deck of the upper structure of the cargo tank in the LNGC according to the present invention with that of an inner deck of the conventional upper structure of the cargo tank. Referring to FIG. 6, assuming that the conventional trunk deck 17 and the trunk deck 102 according to the present invention have the same width, it can be seen that the width Wl (Wl = W2 + 2 x W3) of the conventional inner deck 15 is larger than the width Ws of the inner deck of the embodiment of the present invention. That is, according to the present invention, the free surface of the liquefied natural gas in the cargo tank is reduced such that the sloshing load is minimized.
[37] Passage assemblies 110 are positioned on the flat upper surface of the inner deck extensions respectively. The passage assemblies 110 refer to passage structures including pipes, pipe supports for supporting the pipes, cables, cableways for arranging the cables, and passages through which workers pass.
[38] The upper structure of the cargo tank according to the embodiment of the present invention has a wide interior space as compared with the conventional upper structure of the cargo tank illustrated in FIG. 2. Further, as a flat bottom surface is provided in the interior space, the passage assemblies 110 can be easily positioned even without using the conventional support members 62. Moreover, since the upper surfaces of the inner deck extensions 106 are flat, steel gratings that have been used as the bottom surface of the passage may not need to be manufactured.
[39] Due to the geometric characteristics of the rectangular box-shaped structure to which the inner deck extensions 106 are added, the trunk deck 102 according to the embodiment of the present invention has a wide uppermost area as compared with the conventional trunk deck 17 illustrated in FIG. 2. In other words, the widthwise length of the trunk deck 102 is the sum of the widthwise length of the inner deck 108 and the widthwise lengths of the two inner deck extensions 106. Accordingly, the pipes can be arranged not in the conventional multilayer structure 70 illustrated in FIG. 2 but in a single structure 112. The arrangement provides a convenience in performing maintenance and repair of the pipes and a sealing test work such as a hydro test.
[40] In addition, the uppermost areas of the trunk deck 102 according to the embodiment of the present invention are expanded as compared with the conventional one, as a result the liquid dome opening 50 can be optimally disposed on the trunk deck 102. Here, the liquid dome opening 50 is equipment functioning as a sort of an entrance for cargo for supplying liquefied natural gas into the cargo tank or withdrawing the liquefied natural gas from the cargo tank.
[41] A plurality of reinforcing members referred to girders can be used in the trunk deck
102 for the purpose of maintaining the longitudinal strength of the hull. The girders include a center girder and side girders. The center girder is installed on the longitudinal center line of the trunk deck 102 and the side girders are disposed in parallel to each other on both sides of the center girder. The center girder and the side girders are members for enhancing the longitudinal strength of the hull.
[42] The uppermost area of the conventional trunk deck 17 illustrated in FIGS. 2 and 3 is so narrow that the liquid dome opening 50 must intrude into the center girder of the trunk deck 17. Because of the arrangement, the continuity of the center girder is partially interrupted and the longitudinal strength of the hull decreases. However, since the trunk deck 102 according to the embodiment of the present invention that is illustrated in FIGS. 4 and 5 has a wider uppermost area as compared with the conventional trunk deck 17, the liquid dome opening 50 can be arranged not to intrude the longitudinal center line and can be disposed between the center girder and one of the side girders. This arrangement maintains the continuity of the center girder, thereby increasing the longitudinal strength of the hull. Additionally, it also increases the torsional rigidity of the hull.
[43] As mentioned above, in the upper structure of the cargo tank in the LNGC according to the embodiment of the present invention, as the width of the inner deck is reduced to the minimal requirement range, the sloshing load in the cargo tank can be minimized. Further, due to the geometric characteristics of the rectangular box-shaped structure, the uppermost area of the trunk deck and the lower space of the horizontal trunk deck is so sufficient that various equipments such as the passage assembly including the pipes, the cables, and the passages can be easily disposed. Furthermore, the liquid dome opening is deviated from the center girder so that the longitudinal strength of the hull can be enhanced.
[44] In addition, in the upper structure of the cargo tank in the LNGC according to the embodiment of the present invention, since the passage assemblies can be simply positioned on the upper surfaces of the inner deck extensions, the separate support members installed in the conventional inclined spaces are unnecessary and the steel grating (about 200 M) used as the bottom surface of the passage is also unnecessary, thereby reducing the ship construction cost by shortening the work time and reducing the work cost.
[45] Moreover, in the upper structure of the cargo tank in the LNGC according to the embodiment of the present invention, the wide uppermost area of the trunk deck as compared with the conventional one allows the arrangement of the pipes in a single layer structure, thereby providing a convenience in performing installation, maintenance, and repair of the pipes as well as various tests (e.g. hydro test).
[46] Although the preferred embodiment of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

Claims
[1] An upper structure of a cargo tank in an LNGC comprising: an inner deck, both ends of which are connected to the upper ends of inner inclined plates extending from inner side plates respectively; a trunk deck spaced apart from the inner deck above the inner deck and extending further to the right and to the left than the inner deck by a predetermined length respectively; trunk inclined sections, ends of which are connected to both ends of the trunk deck and the other ends of which are located on right and left horizontal extension lines of the inner deck; and inner deck extensions extending from both ends of the inner deck to the trunk inclined sections respectively.
[2] The upper structure of the cargo tank according to claim 1, wherein the inner deck, the trunk deck, the trunk inclined sections, and the inner deck extensions form a rectangular box-shaped structure.
[3] The upper structure of the cargo tank according to claim 1, wherein the width of the inner deck is reduced to a minimal requirement range required by pipes and cargo systems that can be mounted to the upper and lower surfaces of the inner deck or can penetrate the inner deck.
[4] The upper structure of the cargo tank according to claim 1, wherein the inclination angle of the trunk inclined sections is ninety degrees downward with respect to the trunk deck.
[5] The upper structure of the cargo tank according to claim 1, wherein passage assemblies including pipes, pipe supports, cables, cableways, and passages are positioned on the upper surface of the inner deck extensions respectively without using any separate support member.
[6] The upper structure of the cargo tank according to one of claims 1 to 5, wherein a liquid dome opening is deviated from the longitudinal center line and is eccentrically disposed on the upper surface of the trunk deck.
[7] A LNGC comprising the upper structure of the cargo tank according to one of claims 1 to 5.
PCT/KR2007/006468 2006-12-12 2007-12-12 Upper structure of cargo tank in lngc WO2008072893A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07851439.5A EP2089267B1 (en) 2006-12-12 2007-12-12 Upper structure of cargo tank in lngc
CN2007800461383A CN101583533B (en) 2006-12-12 2007-12-12 Upper structure of cargo tank in LNGC

Applications Claiming Priority (2)

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KR10-2006-0126019 2006-12-12
KR1020060126019A KR100785478B1 (en) 2006-12-12 2006-12-12 Upper structure of cargo tank in lngc

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Also Published As

Publication number Publication date
CN101583533A (en) 2009-11-18
CN101583533B (en) 2012-06-06
EP2089267A4 (en) 2012-11-07
EP2089267B1 (en) 2013-11-06
EP2089267A1 (en) 2009-08-19
KR100785478B1 (en) 2007-12-13

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