EP3760530A1 - Ship - Google Patents

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Publication number
EP3760530A1
EP3760530A1 EP19761627.9A EP19761627A EP3760530A1 EP 3760530 A1 EP3760530 A1 EP 3760530A1 EP 19761627 A EP19761627 A EP 19761627A EP 3760530 A1 EP3760530 A1 EP 3760530A1
Authority
EP
European Patent Office
Prior art keywords
tank body
chock
tank
dome
pair
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP19761627.9A
Other languages
German (de)
French (fr)
Other versions
EP3760530B1 (en
EP3760530A4 (en
Inventor
Yuichiro Ueda
Maiko Tanaka
Takumi Yoshida
Yuzo EGUCHI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Heavy Industries Ltd
Kawasaki Motors Ltd
Original Assignee
Kawasaki Heavy Industries Ltd
Kawasaki Jukogyo KK
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 Kawasaki Heavy Industries Ltd, Kawasaki Jukogyo KK filed Critical Kawasaki Heavy Industries Ltd
Publication of EP3760530A1 publication Critical patent/EP3760530A1/en
Publication of EP3760530A4 publication Critical patent/EP3760530A4/en
Application granted granted Critical
Publication of EP3760530B1 publication Critical patent/EP3760530B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • 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
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0358—Thermal insulations by solid means in form of panels
    • 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
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0123—Mounting arrangements characterised by number of vessels
    • F17C2205/013—Two or more vessels
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/018—Supporting feet
    • 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
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/0192—Details of mounting arrangements with external bearing means
    • 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
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • 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
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • 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 present invention relates to a ship including a tank storing liquefied gas.
  • Patent Literature 1 discloses a structure in the vicinity of a tank 120 in a ship 100 as shown in FIG. 6 .
  • the tank 120 installed in a hull 110 is covered by a tank cover 130.
  • the tank 120 includes a cylindrical tank body 121 and a dome 122.
  • the tank body 121 extends horizontally.
  • the dome 122 protrudes upward from the tank body 121.
  • the tank cover 130 includes an opening 131, which allows the dome 122 to be inserted therethrough.
  • the opening 131 is covered by a dome cover 140.
  • the ship 100 as shown in FIG. 6 which includes the tank 120 including the cylindrical tank body 121, is desirably provided with a chock that restrains rolling of the tank 120, which is caused by rolling of the hull 110.
  • a chock that restrains rolling of the tank 120, which is caused by rolling of the hull 110.
  • the tank cover 130 is supported by a plurality of frame members that are arranged in the axial direction of the tank body 121, it is conceivable to provide a chock between one of the frame members and the top portion of the tank body 121 (the top portion is a portion extending straight in the axial direction of the tank body 121).
  • the dome has a positional restriction.
  • an object of the present invention is to provide a ship that makes it possible to reduce the positional restriction of the dome.
  • the inventors of the present invention have paid attention to the fact that, in general, an annular reinforcing member that supports the tank cover is provided around the opening that allows the dome to be inserted therethrough. Then, the inventors of the present invention have come up with providing a chock on the reinforcing member.
  • the present invention has been made from such a technological point of view.
  • a ship includes: a hull; a tank that is installed in the hull and stores liquefied gas, the tank including a cylindrical tank body and a dome, the tank body extending horizontally, the dome protruding upward from the tank body; a tank cover that covers the tank body, the tank cover including an opening that allows the dome to be inserted therethrough; an annular reinforcing member that supports the tank cover around the opening; and a chock that restrains rolling of the tank, the chock being provided between the reinforcing member and a top portion of the tank body.
  • the chock is provided between the top portion of the tank body and the annular reinforcing member that supports the tank cover around the opening. This makes it possible to reduce the positional restriction of the dome.
  • the chock since the chock is disposed near the dome, the distance between the dome and the chock can be reduced compared to a case where the chock is provided between one of the frame members and the top portion of the tank body. This makes it possible to allow the dome to increase in size to such a degree that restrictions in terms of the number and the size of pipes penetrating the dome can be eased.
  • An axial direction of the tank body may be parallel to a ship length direction.
  • a center of the dome may be positioned aft of a center of the tank body in the axial direction.
  • the chock may be disposed aft of the dome. According to this configuration, even though the chock is disposed aft of the dome, the dome can be designed such that the dome is located at the aftmost position.
  • the chock may be a first chock.
  • the above ship may further include: a plurality of frame members that support the tank cover, the plurality of frame members being arranged in the axial direction of the tank body; a pair of saddles that supports the tank body at respective positions that are spaced apart from each other in the axial direction of the tank body; and a second chock disposed fore of the dome, the second chock being provided between the top portion of the tank body and one of the plurality of frame members.
  • the first chock and the second chock may be disposed such that, when seen in a vertical direction, positions of the first and second chocks coincide with positions of the pair of saddles, respectively. This configuration makes it possible to suppress torsional deformation of the tank body when the hull rolls.
  • the chock may include: a block fixed to the tank body; and a pair of stoppers positioned at both sides of the block in a width direction of the tank body.
  • the pair of stoppers may be fixed to the reinforcing member.
  • each of the first chock and the second chock may include: a block fixed to the tank body; and a pair of stoppers positioned at both sides of the block in a width direction of the tank body.
  • the pair of stoppers of the first chock may be fixed to the reinforcing member.
  • the pair of stoppers of the second chock may be fixed to the one frame member.
  • the present invention makes it possible to reduce the positional restriction of the dome.
  • FIG. 1 and FIG. 2 show a ship 1 according to one embodiment of the present invention.
  • the ship 1 is, for example, a liquefied gas carrier that transports liquefied gas.
  • the ship 1 includes a hull 2 and two tanks 3 installed in the hull 2.
  • the tanks 3 are arranged in the ship length direction.
  • the number of tanks 3 installed in the hull 2 may be one, or three or more.
  • Each of the tanks 3 stores the liquefied gas.
  • the liquefied gas is liquefied petroleum gas (LPG, about -45°C), liquefied ethylene gas (LEG, about -100°C), liquefied natural gas (LNG, about -160°C), liquefied hydrogen (LH 2 , about -250°C), or liquefied helium (LHe, about -270°C).
  • each tank 3 is a double-shell tank including an inner shell and an outer shell.
  • a vacuum thermal insulation layer is formed between the inner shell and the outer shell.
  • each tank 3 may be a single shell tank covered by a thermal insulator.
  • the thermal insulator may be constituted by a plurality of vacuum insulation panels, or may be constituted by a plurality of foamed panels.
  • Each tank 3 includes a cylindrical tank body 31 and a dome 32.
  • the tank body 31 extends horizontally.
  • the dome 32 protrudes upward from the tank body 31.
  • the axial direction of the tank body 31 need not be exactly parallel to the horizontal direction, but may be substantially parallel to the horizontal direction (e.g., shifted from the horizontal direction by an angle of 10 degrees or less). In the present embodiment, the axial direction of the tank body 31 is parallel to the ship length direction.
  • the tank body 31 includes a body portion that extends in the ship length direction with a constant cross-sectional shape; and hemispherical sealing portions that seal openings on both sides of the body portion.
  • each sealing portion may have a flat shape perpendicular to the body portion, or may be dish-shaped.
  • the dome 32 is intended for putting pipes penetrating the tank 3 into one place.
  • the protruding direction of the dome 32 is parallel to the vertical direction.
  • the protruding direction of the dome 32 may be slightly inclined relative to the vertical direction.
  • the center of the dome 32 is positioned aft of the center of the tank body 31 in the axial direction.
  • a recess 21 is formed in the hull 2.
  • the two tanks 3 are inserted in the recess 21.
  • the recess 21 is divided into two cells 23 by a bulkhead 22 between the tanks 3.
  • a pair of saddles 25 is disposed in each cell 23.
  • the saddles 25 support the tank body 31 at respective positions that are spaced apart from each other in the axial direction of the tank body 31.
  • the saddles 25 are disposed near both ends of the bottom portion of the tank body 31 (the bottom portion is a portion extending straight in the axial direction of the tank body 31).
  • the tank bodies 31 of the tanks 3 are covered by respective tank covers 4.
  • each tank cover 4 includes an opening 41, which allows the dome 32 of the tank 3 to be inserted therethrough.
  • the opening 41 is covered by a dome cover 5.
  • the height of the dome cover 5 is low, and the dome 32 penetrates the dome cover 5. It should be noted that, similar to the conventional ship 100 shown in FIG. 6 , the height of the dome cover 5 may be greater than the height of the top portion of the dome 32.
  • the tank cover 4 is supported by a plurality of frame members 6, which are arranged in the axial direction of the tank body 31. Each of the frame members 6 extends in a direction orthogonal to the axial direction of the tank body 31. Around the opening 41, the tank cover 4 is supported by an annular reinforcing member 7. The reinforcing member 7 is joined to some of the frame members 6 that are located at positions corresponding to the reinforcing member 7.
  • two chocks 8, which restrain rolling of the tank 3 are disposed fore and aft of the dome 32, respectively.
  • the chocks 8 are disposed near both ends of the top portion of the tank body 31 (the top portion is a portion extending straight in the axial direction of the tank body 31).
  • the chocks 8 are disposed such that, when seen in the vertical direction, the positions of the chocks 8 coincide with the positions of the aforementioned saddles 25, respectively.
  • the fore-side chock 8 is provided between one of the frame members 6 and the top portion of the tank body 31.
  • the aft-side chock 8 is provided between the reinforcing member 7 and the top portion of the tank body 31.
  • each chock 8 includes: a block 81 fixed to the tank body 31; and a pair of stoppers 82 positioned at both sides of the block 81 in the width direction (ship width direction) of the tank body 31.
  • the lower portion of the block 81 is inserted in a frame member 83 provided on the top portion of the tank body 31.
  • the pair of stoppers 82 of the fore-side chock 8 is fixed to the one frame member 6, and the pair of stoppers 82 of the aft-side chock 8 is fixed to the reinforcing member 7.
  • each frame member 6 and the cross section of the reinforcing member 7 are both inverted T-shaped.
  • Each of the frame member 6 and the reinforcing member 7 includes a vertical plate and a horizontal flange.
  • the upper end portion of the vertical plate is joined to the tank cover 4 (the vertical plate of the frame member 6 is flat, whereas the vertical plate of the reinforcing member 7 is cylindrical).
  • the horizontal flange is joined to the lower end portion of the vertical plate.
  • the pair of stoppers 82 is fixed to the lower surface of the horizontal flange.
  • the chock 8 is provided between the top portion of the tank body 31 and the annular reinforcing member 7, which supports the tank cover 4 around the opening 41. This makes it possible to reduce the positional restriction of the dome 32.
  • the chock 8 since the chock 8 is disposed near the dome 32, the distance between the dome 32 and the chock 8 can be reduced compared to a case where the chock 8 is provided between one of the frame members 6 and the top portion of the tank body 31. This makes it possible to allow the dome 32 to increase in size to such a degree that restrictions in terms of the number and the size of pipes penetrating the dome 32 can be eased.
  • the dome 32 can be designed such that the dome 32 is located at the aftmost position.
  • the chocks 8 are disposed such that, when seen in the vertical direction, the positions of the chocks 8 coincide with the positions of the aforementioned saddles 25, respectively. This makes it possible to suppress torsional deformation of the tank body 31 when the hull 2 rolls.
  • the number of chocks 8 may be one.
  • the chock 8 may be disposed fore of the dome 32.

Landscapes

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

Abstract

A ship includes: a hull; a tank that is installed in the hull and stores liquefied gas, the tank including a cylindrical tank body and a dome, the tank body extending horizontally, the dome protruding upward from the tank body; a tank cover that covers the tank body, the tank cover including an opening that allows the dome to be inserted therethrough; an annular reinforcing member that supports the tank cover around the opening; and a chock that restrains rolling of the tank, the chock being provided between the reinforcing member and a top portion of the tank body.

Description

    Technical Field
  • The present invention relates to a ship including a tank storing liquefied gas.
    • Background Art
  • In a ship such as a liquefied gas carrier, a tank storing liquefied gas is installed in the hull. The shape of the tank is various. For example, Patent Literature 1 discloses a structure in the vicinity of a tank 120 in a ship 100 as shown in FIG. 6.
  • In the ship 100, the tank 120 installed in a hull 110 is covered by a tank cover 130. The tank 120 includes a cylindrical tank body 121 and a dome 122. The tank body 121 extends horizontally. The dome 122 protrudes upward from the tank body 121. The tank cover 130 includes an opening 131, which allows the dome 122 to be inserted therethrough. The opening 131 is covered by a dome cover 140.
    • Citation List Patent Literature
  • PTL 1: Japanese Laid-Open Patent Application Publication No. 2015-4382
    • Summary of Invention Technical Problem
  • The ship 100 as shown in FIG. 6, which includes the tank 120 including the cylindrical tank body 121, is desirably provided with a chock that restrains rolling of the tank 120, which is caused by rolling of the hull 110. For example, since the tank cover 130 is supported by a plurality of frame members that are arranged in the axial direction of the tank body 121, it is conceivable to provide a chock between one of the frame members and the top portion of the tank body 121 (the top portion is a portion extending straight in the axial direction of the tank body 121).
  • In this case, however, it is necessary to first determine the position of the chock based on the position of the one frame member, and thereafter determine the position of the dome. Thus, the dome has a positional restriction.
  • In view of the above, an object of the present invention is to provide a ship that makes it possible to reduce the positional restriction of the dome.
    • Solution to Problem
  • In order to solve the above-described problems, the inventors of the present invention have paid attention to the fact that, in general, an annular reinforcing member that supports the tank cover is provided around the opening that allows the dome to be inserted therethrough. Then, the inventors of the present invention have come up with providing a chock on the reinforcing member. The present invention has been made from such a technological point of view.
  • Specifically, a ship according to the present invention includes: a hull; a tank that is installed in the hull and stores liquefied gas, the tank including a cylindrical tank body and a dome, the tank body extending horizontally, the dome protruding upward from the tank body; a tank cover that covers the tank body, the tank cover including an opening that allows the dome to be inserted therethrough; an annular reinforcing member that supports the tank cover around the opening; and a chock that restrains rolling of the tank, the chock being provided between the reinforcing member and a top portion of the tank body.
  • According to the above configuration, the chock is provided between the top portion of the tank body and the annular reinforcing member that supports the tank cover around the opening. This makes it possible to reduce the positional restriction of the dome. In addition, since the chock is disposed near the dome, the distance between the dome and the chock can be reduced compared to a case where the chock is provided between one of the frame members and the top portion of the tank body. This makes it possible to allow the dome to increase in size to such a degree that restrictions in terms of the number and the size of pipes penetrating the dome can be eased.
  • An axial direction of the tank body may be parallel to a ship length direction. A center of the dome may be positioned aft of a center of the tank body in the axial direction. The chock may be disposed aft of the dome. According to this configuration, even though the chock is disposed aft of the dome, the dome can be designed such that the dome is located at the aftmost position.
  • The chock may be a first chock. The above ship may further include: a plurality of frame members that support the tank cover, the plurality of frame members being arranged in the axial direction of the tank body; a pair of saddles that supports the tank body at respective positions that are spaced apart from each other in the axial direction of the tank body; and a second chock disposed fore of the dome, the second chock being provided between the top portion of the tank body and one of the plurality of frame members. The first chock and the second chock may be disposed such that, when seen in a vertical direction, positions of the first and second chocks coincide with positions of the pair of saddles, respectively. This configuration makes it possible to suppress torsional deformation of the tank body when the hull rolls.
  • For example, the chock may include: a block fixed to the tank body; and a pair of stoppers positioned at both sides of the block in a width direction of the tank body. The pair of stoppers may be fixed to the reinforcing member.
  • Alternatively, each of the first chock and the second chock may include: a block fixed to the tank body; and a pair of stoppers positioned at both sides of the block in a width direction of the tank body. The pair of stoppers of the first chock may be fixed to the reinforcing member. The pair of stoppers of the second chock may be fixed to the one frame member.
    • Advantageous Effects of Invention
  • The present invention makes it possible to reduce the positional restriction of the dome.
    • Brief Description of Drawings
    • FIG. 1 is a side view of a ship according to one embodiment of the present invention.
    • FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1.
    • FIG. 3 is a longitudinal sectional view of a part of the ship of FIG. 1.
    • FIG. 4 is a plan view taken along line IV-IV of FIG. 3.
    • FIG. 5 is a front view of a chock.
    • FIG. 6 is a sectional view of a part of a conventional ship.
    Description of Embodiments
  • FIG. 1 and FIG. 2 show a ship 1 according to one embodiment of the present invention. The ship 1 is, for example, a liquefied gas carrier that transports liquefied gas.
  • In the present embodiment, the ship 1 includes a hull 2 and two tanks 3 installed in the hull 2. The tanks 3 are arranged in the ship length direction. Alternatively, the number of tanks 3 installed in the hull 2 may be one, or three or more.
  • Each of the tanks 3 stores the liquefied gas. For example, the liquefied gas is liquefied petroleum gas (LPG, about -45°C), liquefied ethylene gas (LEG, about -100°C), liquefied natural gas (LNG, about -160°C), liquefied hydrogen (LH2, about -250°C), or liquefied helium (LHe, about -270°C).
  • In the present embodiment, as shown in FIG. 2, each tank 3 is a double-shell tank including an inner shell and an outer shell. For example, a vacuum thermal insulation layer is formed between the inner shell and the outer shell. Alternatively, each tank 3 may be a single shell tank covered by a thermal insulator. For example, the thermal insulator may be constituted by a plurality of vacuum insulation panels, or may be constituted by a plurality of foamed panels.
  • Each tank 3 includes a cylindrical tank body 31 and a dome 32. The tank body 31 extends horizontally. The dome 32 protrudes upward from the tank body 31. The axial direction of the tank body 31 need not be exactly parallel to the horizontal direction, but may be substantially parallel to the horizontal direction (e.g., shifted from the horizontal direction by an angle of 10 degrees or less). In the present embodiment, the axial direction of the tank body 31 is parallel to the ship length direction.
  • To be more specific, the tank body 31 includes a body portion that extends in the ship length direction with a constant cross-sectional shape; and hemispherical sealing portions that seal openings on both sides of the body portion. Alternatively, each sealing portion may have a flat shape perpendicular to the body portion, or may be dish-shaped.
  • The dome 32 is intended for putting pipes penetrating the tank 3 into one place. In the present embodiment, the protruding direction of the dome 32 is parallel to the vertical direction. Alternatively, the protruding direction of the dome 32 may be slightly inclined relative to the vertical direction. In the present embodiment, the center of the dome 32 is positioned aft of the center of the tank body 31 in the axial direction.
  • A recess 21 is formed in the hull 2. The two tanks 3 are inserted in the recess 21. The recess 21 is divided into two cells 23 by a bulkhead 22 between the tanks 3. In each cell 23, a pair of saddles 25 is disposed. The saddles 25 support the tank body 31 at respective positions that are spaced apart from each other in the axial direction of the tank body 31. For example, the saddles 25 are disposed near both ends of the bottom portion of the tank body 31 (the bottom portion is a portion extending straight in the axial direction of the tank body 31).
  • The tank bodies 31 of the tanks 3 are covered by respective tank covers 4. Each tank cover 4, together with the aforementioned cell 23, forms a cargo chamber that accommodates the tank body 31.
  • As shown in FIG. 3 and FIG. 4, each tank cover 4 includes an opening 41, which allows the dome 32 of the tank 3 to be inserted therethrough. The opening 41 is covered by a dome cover 5. In the present embodiment, the height of the dome cover 5 is low, and the dome 32 penetrates the dome cover 5. It should be noted that, similar to the conventional ship 100 shown in FIG. 6, the height of the dome cover 5 may be greater than the height of the top portion of the dome 32.
  • The tank cover 4 is supported by a plurality of frame members 6, which are arranged in the axial direction of the tank body 31. Each of the frame members 6 extends in a direction orthogonal to the axial direction of the tank body 31. Around the opening 41, the tank cover 4 is supported by an annular reinforcing member 7. The reinforcing member 7 is joined to some of the frame members 6 that are located at positions corresponding to the reinforcing member 7.
  • In the present embodiment, two chocks 8, which restrain rolling of the tank 3, are disposed fore and aft of the dome 32, respectively. For example, the chocks 8 are disposed near both ends of the top portion of the tank body 31 (the top portion is a portion extending straight in the axial direction of the tank body 31). In the present embodiment, the chocks 8 are disposed such that, when seen in the vertical direction, the positions of the chocks 8 coincide with the positions of the aforementioned saddles 25, respectively.
  • The fore-side chock 8 is provided between one of the frame members 6 and the top portion of the tank body 31. On the other hand, the aft-side chock 8 is provided between the reinforcing member 7 and the top portion of the tank body 31.
  • As shown in FIG. 5, each chock 8 includes: a block 81 fixed to the tank body 31; and a pair of stoppers 82 positioned at both sides of the block 81 in the width direction (ship width direction) of the tank body 31. For example, the lower portion of the block 81 is inserted in a frame member 83 provided on the top portion of the tank body 31. The pair of stoppers 82 of the fore-side chock 8 is fixed to the one frame member 6, and the pair of stoppers 82 of the aft-side chock 8 is fixed to the reinforcing member 7.
  • For example, the cross section of each frame member 6 and the cross section of the reinforcing member 7 are both inverted T-shaped. Each of the frame member 6 and the reinforcing member 7 includes a vertical plate and a horizontal flange. The upper end portion of the vertical plate is joined to the tank cover 4 (the vertical plate of the frame member 6 is flat, whereas the vertical plate of the reinforcing member 7 is cylindrical). The horizontal flange is joined to the lower end portion of the vertical plate. The pair of stoppers 82 is fixed to the lower surface of the horizontal flange.
  • As described above, in the ship 1 of the present embodiment, the chock 8 is provided between the top portion of the tank body 31 and the annular reinforcing member 7, which supports the tank cover 4 around the opening 41. This makes it possible to reduce the positional restriction of the dome 32. In addition, since the chock 8 is disposed near the dome 32, the distance between the dome 32 and the chock 8 can be reduced compared to a case where the chock 8 is provided between one of the frame members 6 and the top portion of the tank body 31. This makes it possible to allow the dome 32 to increase in size to such a degree that restrictions in terms of the number and the size of pipes penetrating the dome 32 can be eased.
  • Moreover, even though the chock is disposed aft of the dome 32, the dome 32 can be designed such that the dome 32 is located at the aftmost position.
  • Furthermore, in the present embodiment, the chocks 8 are disposed such that, when seen in the vertical direction, the positions of the chocks 8 coincide with the positions of the aforementioned saddles 25, respectively. This makes it possible to suppress torsional deformation of the tank body 31 when the hull 2 rolls.
    • (Variations)
  • The present invention is not limited to the above-described embodiment. Various modifications can be made without departing from the scope of the present invention.
  • For example, the number of chocks 8 may be one. In this case, the chock 8 may be disposed fore of the dome 32.
    • Reference Signs List
    • 1
    ship
    2
    hull
    25
    saddle
    3
    tank
    31
    tank body
    32
    dome
    4
    tank cover
    41
    opening
    6
    frame member
    7
    reinforcing member
    8
    chock

Claims (5)

  1. A ship comprising:
    a hull;
    a tank that is installed in the hull and stores liquefied gas, the tank including a cylindrical tank body and a dome, the tank body extending horizontally, the dome protruding upward from the tank body;
    a tank cover that covers the tank body, the tank cover including an opening that allows the dome to be inserted therethrough;
    an annular reinforcing member that supports the tank cover around the opening; and
    a chock that restrains rolling of the tank, the chock being provided between the reinforcing member and a top portion of the tank body.
  2. The ship according to claim 1, wherein
    an axial direction of the tank body is parallel to a ship length direction,
    a center of the dome is positioned aft of a center of the tank body in the axial direction, and
    the chock is disposed aft of the dome.
  3. The ship according to claim 2, wherein
    the chock is a first chock,
    the ship further comprises:
    a plurality of frame members that support the tank cover, the plurality of frame members being arranged in the axial direction of the tank body;
    a pair of saddles that supports the tank body at respective positions that are spaced apart from each other in the axial direction of the tank body; and
    a second chock disposed fore of the dome, the second chock being provided between the top portion of the tank body and one of the plurality of frame members, and
    the first chock and the second chock are disposed such that, when seen in a vertical direction, positions of the first and second chocks coincide with positions of the pair of saddles, respectively.
  4. The ship according to claim 1 or 2, wherein
    the chock includes:
    a block fixed to the tank body; and
    a pair of stoppers positioned at both sides of the block in a width direction of the tank body, and
    the pair of stoppers is fixed to the reinforcing member.
  5. The ship according to claim 3, wherein
    each of the first chock and the second chock includes:
    a block fixed to the tank body; and
    a pair of stoppers positioned at both sides of the block in a width direction of the tank body,
    the pair of stoppers of the first chock is fixed to the reinforcing member, and
    the pair of stoppers of the second chock is fixed to the one frame member.
EP19761627.9A 2018-03-02 2019-03-04 Ship Active EP3760530B1 (en)

Applications Claiming Priority (2)

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JP2018037207A JP7231984B2 (en) 2018-03-02 2018-03-02 vessel
PCT/JP2019/008287 WO2019168195A1 (en) 2018-03-02 2019-03-04 Ship

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EP3760530A1 true EP3760530A1 (en) 2021-01-06
EP3760530A4 EP3760530A4 (en) 2021-12-01
EP3760530B1 EP3760530B1 (en) 2023-12-06

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KR (1) KR102401051B1 (en)
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JP7560952B2 (en) 2020-03-30 2024-10-03 川崎重工業株式会社 Liquefied Gas Storage Vessel
JP7538654B2 (en) 2020-08-21 2024-08-22 川崎重工業株式会社 Liquefied Gas Carrier
WO2023157262A1 (en) * 2022-02-18 2023-08-24 川崎重工業株式会社 Floating structure, displacement amount acquisition method, and supporting state determination method
JP2023129924A (en) 2022-03-07 2023-09-20 ジャパンマリンユナイテッド株式会社 Oscillation suppression structure for self-standing type storage tank
JP2023176313A (en) * 2022-05-31 2023-12-13 三菱造船株式会社 ship
JP2024018231A (en) * 2022-07-29 2024-02-08 三菱重工業株式会社 Vessel

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JPS5251686A (en) * 1975-10-20 1977-04-25 Hitachi Zosen Corp Low temperature liquified gas carrying vessel
JPH03287485A (en) * 1990-04-05 1991-12-18 Shinkurushima Dock:Kk Cooled liquid carrying vessel
JPH08295394A (en) * 1995-04-26 1996-11-12 Ishikawajima Harima Heavy Ind Co Ltd Cryostatic tank for cryogenic liquefied gas
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JP6220164B2 (en) * 2013-06-19 2017-10-25 川崎重工業株式会社 Double shell tank and liquefied gas carrier
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KR20180011424A (en) * 2016-07-22 2018-02-01 삼성중공업 주식회사 Independence type storage tank and ship having the same

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JP7231984B2 (en) 2023-03-02
KR20200112971A (en) 2020-10-05
JP2019151191A (en) 2019-09-12
KR102401051B1 (en) 2022-05-24
EP3760530B1 (en) 2023-12-06
EP3760530A4 (en) 2021-12-01
WO2019168195A1 (en) 2019-09-06
CN111788115A (en) 2020-10-16
CN111788115B (en) 2022-11-22

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