Liquid cargo carrier

Abstract

A liquid cargo carrier of the present invention comprises a cargo tank having a space for accommodating liquid cargo, wherein the liquid cargo carrier comprises a round barrier provided at a corner portion formed at an incline in the cargo tank, a secondary barrier having a portion covering the round barrier, a second insulation portion including an angle board provided at the corner portion of the cargo tank and a bottom board adjacent to the angle board in a horizontal direction, and a stud penetrating the second insulation portion and a first insulation portion arranged in an up-and-down direction with the secondary barrier in between, and the round barrier extends to the position of the stud so that the stud is welded on the angle board. The present invention can facilitate the production of the cargo hold corner section.

Description

Technology Field

[0001] The present invention relates to a liquid cargo carrier. Background Technology

[0002] LNG carriers that transport liquid cargo such as LNG, a cryogenic fluid, can have a double-walled hull, several bulkheads installed inside along the fore-and-aft length, and several cargo tanks located between the bulkheads, that is, along the fore-and-aft length of the hull.

[0003] The barrier structure of the cargo tank may be formed by sequentially combining a primary barrier, an upper insulation board, a secondary barrier, and a lower insulation board for the storage and insulation of cryogenic liquid cargo. This is intended to ensure that insulation is achieved while preventing further leakage of the fluid from the secondary barrier in the event of a small leakage of the cryogenic fluid in the primary barrier.

[0004] Studs may be provided to install a secondary barrier. The studs have a structure in which wings with expanded cross-sections are integrally formed. In this case, in order for the wings to be integrally formed, the area of ​​the stud other than the wings is machined, resulting in material waste.

[0005] In addition, a lower insulation board, a secondary barrier, and an upper insulation board are installed at the corner of the cargo hold according to the shape of the corner. At this time, the lower insulation board of the corner is typically manufactured as a single piece and installed at the corner.

[0006] When manufacturing the cargo hold corner section, the method of siding the secondary barrier is to pre-fabricate it between the corrugation and the hole (stud installation area), and then cutting it, which may cause the work to be delayed. The problem to be solved

[0007] The problem that the present invention aims to solve is to provide a liquid cargo carrier in which the corner section of the cargo hold can be easily manufactured.

[0008] The problems of the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the description below. means of solving the problem

[0009] An aspect of the liquid cargo carrier according to the present invention for achieving the above objective comprises, in a liquid cargo carrier including a cargo tank in which a space for receiving liquid cargo is formed, a round barrier provided at a corner portion formed at an angle in the cargo tank, a secondary barrier having a portion covering the round barrier, a second insulation portion including an angle board provided at the corner portion of the cargo tank and a bottom board adjacent to the angle board in a horizontal direction, and a stud penetrating the second insulation portion and a first insulation portion arranged in an up-and-down direction with the secondary barrier in between, wherein the round barrier extends to the position of the stud so that the stud is welded on the angle board.

[0010] The round barrier may be extended to the end of the angle board to cover the entire side of the angle board.

[0011] The above secondary barrier covers the entire side of the bottom board and extends to the angle board to cover a part of the round barrier.

[0012] The above secondary barrier may not extend to the area where the stud is located so as not to interfere with the stud, and may have an end formed before the area where the stud is located.

[0013] The above studs may be provided as straight studs rather than as collar studs.

[0014] Specific details of other embodiments are included in the detailed description and drawings. Effects of the invention

[0015] The liquid cargo carrier according to the present invention is provided with straight studs instead of rugal studs, and has a structure in which round barriers cover the entire angle board, making it easier to manufacture the cargo tank and thus improving profitability. Brief explanation of the drawing

[0016] FIG. 1 is a drawing illustrating a liquid cargo carrier according to some embodiments of the present invention. Figure 2 is a drawing illustrating a cargo hold structure located in area A of Figure 1. Figure 3 is a drawing illustrating the cargo hold structure of a comparative example. Figure 4 is a drawing illustrating region B of Figure 3. Specific details for implementing the invention

[0017] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the attached drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0018] FIG. 1 is a drawing illustrating a liquid cargo carrier according to some embodiment of the present invention, and FIG. 2 is a drawing illustrating a cargo tank structure located in area A of FIG. 1. In addition, FIG. 3 is a drawing illustrating a cargo tank structure of a comparative example, and FIG. 4 is a drawing illustrating area B of FIG. 3.

[0019] Referring to FIGS. 1 and FIGS. 2, a ship (100) according to an embodiment of the present invention may be provided with a cargo tank (200) for storing cryogenic cargo.

[0020] To briefly describe the vessel (100) equipped with a cargo tank (200), the vessel (100) may be a carrier (hereinafter referred to as an LNG carrier) that carries cryogenic cargo (e.g., LNG). The LNG carrier stores and transports LNG as cargo, for example, but the fuel may be LNG or any one of other types of gas (e.g., LPG (Liquefied Petroleum Gas), DME (Dimethyl ether), and ethane).

[0021] In addition, the cargo stored in the cargo tank (200) is not limited to liquefied natural gas (LNG) but can be used in various ways to store cryogenic cargo, such as liquefied petroleum gas (LPG). Also, the vessel (100) of this embodiment is exemplified by having a polyhedral-shaped membrane-type cargo tank (200), but is not limited thereto.

[0022] The cargo tank (200) may have a structure for storing cryogenic LNG, and may have a structure in which a first barrier (not shown), a first insulation section (not shown), a second barrier (210), and a second insulation section (220) are sequentially stacked in the direction of the hull from the storage space containing the liquid cargo.

[0023] The primary barrier may be provided to surround a space where the liquid cargo can be received and where the liquid cargo can be received. In other words, the primary barrier may provide a space for storing the liquid cargo and thus contain the liquid cargo, so that the liquid cargo can be received in the space provided by the primary barrier in direct contact with the primary barrier.

[0024] The primary barrier may be provided as a membrane structure formed of a metal material resistant to low-temperature brittleness, such as aluminum alloy, Invar, nickel steel, or stainless steel sheet. The primary barrier may have a corrugated structure to adapt to expansion and contraction due to temperature changes in the cargo tank (200). The primary barrier may be installed on the first insulation section by means of an anchor strip (not shown) provided in the first insulation section and a welding method, etc.

[0025] The first insulation section and the second insulation section (220) are insulating materials, and the first insulation section wraps around the primary barrier, and the second insulation section (220) wraps around the secondary barrier (210) so as to prevent heat loss of the liquid cargo. That is, the first insulation section and the second insulation section (220) can be provided to insulate the liquid cargo from the outside.

[0026] The first insulation section and the second insulation section (220) differ in that they form a primary barrier and a secondary barrier, and may be identical or similar in that they are provided as a combination of puff and plywood provided on the puff (e.g., see identification numbers 221A, 221B, 222).

[0027] The second barrier (210) can be provided in a structure that surrounds the first insulation section between the second insulation section (220) and the first insulation section. That is, the first barrier and the second barrier (210) can form a double-sealed structure with the first insulation section in between. Therefore, even if liquid cargo leaks from the first barrier, the second barrier (210) can block the liquid cargo from flowing out toward the hull.

[0028] The secondary barrier (210) may be provided with a composite material (such as aluminum and glass-reinforced fiber). For example, the secondary barrier (210) may be formed by combining a rigid secondary barrier (RSB) and a flexible secondary barrier (FSB) with an adhesive (e.g., polyurethane glue). The RSB may be, for example, a laminated structure of aluminum foil and glass-reinforced fiber, and the FSB may be, for example, a laminated structure of aluminum foil, glass-reinforced fiber, and a rubber layer to have flexibility. Here, the aluminum foil provided for each of the RSB and FSB is provided as a thin film surface so as to block the movement of liquid cargo, thereby forming a sealed structure for the cargo tank (200).

[0029] Meanwhile, the secondary barrier (210) provided in the corner section may be provided as a barrier that forms a round shape corresponding to the angle of inclination of the corner section (e.g., 90 degrees or 135 degrees, etc.), and hereinafter referred to as a round barrier (210R) to distinguish it from the secondary barrier (210) provided in a parallel section such as a floor surface or a ceiling surface. Also, as indicated by identification number D1 in FIG. 2, the secondary barrier (210) may be provided in a form in which it is partially covered by the round barrier (210R).

[0030] The round barrier (210R) of this embodiment is provided with a composite material identical or similar to the secondary barrier (210) and can block liquid cargo from leaking out. However, the round barrier (210R) may be provided with a thickness at least twice as thick as the secondary barrier (210) provided in a parallel section such as a floor surface or a ceiling surface (e.g., the thickness of the secondary barrier (210) is 1.2T (mm) and the thickness of the round barrier (210R) may be 5T (mm)).

[0031] That is, the secondary barrier (210) is provided according to a design that prevents leakage of liquid cargo while minimizing material costs, and can have a thickness that makes it difficult for the stud (240) to be welded. Referring to FIGS. 3 and 4, in order for the stud (40) of the comparative example to be provided to the secondary barrier (21) of the comparative example, a metal block (30) must be provided.

[0032] At this time, the stud (40) of the comparative example has a wing (41) formed so that the metal block (30) is sealed, and to provide such a stud (40), the stud (40) must be machined in a portion such as area C.

[0033] On the other hand, the round barrier (210R) provided in the corner section of this embodiment has a thickness that allows for welding of the stud (240), so it is provided only in a partial area such as the corner section, and thus material costs do not increase significantly, while making it easy to provide / install the configuration related to the stud (240). That is, it is possible to replace the specially manufactured stud (40) and metal block (30) of the comparative example with a straight-shaped stud (240).

[0034] And the round barrier (210R) can be provided to cover the entire angle board (221A), but there are various variations, such as the stud (240) being provided on the round barrier (210R) so that the stud (240) is provided without mediating a metal block, and the round barrier (210R) extending to the position of the stud (240) penetrating the primary insulation section and not covering the entire angle board (221A).

[0035] The stud (240) of this embodiment, unlike the comparative example, is not joined to the metal block (30) but is fixed to the round barrier (210R) by welding, and can have the same diameter from top to bottom so as not to have an extended area like the wing (41) of the stud (40) of the comparative example.

[0036] Accordingly, in order to manufacture / use the stud (40) of the comparative example, the work (e.g., cutting) to remove the area outside the wing (41) (refer to area C in FIG. 4) so ​​as to form a wing (41) with an expanded cross-sectional area in the stud (40) is omitted, and a straight-shaped stud that is easy to manufacture / prepare can be used. That is, material costs can be reduced by using a straight-shaped stud (e.g., a ready-made product) instead of a special-shaped stud (40).

[0037] The stud (240) of this embodiment may have threads formed on its periphery so that the round barrier (210R) can be fixed to the second insulation part (220). That is, the stud (240) may have a structure to which a nut is coupled.

[0038] A first insulation section is provided on the second barrier (210) and the round barrier (210R), and the first insulation section (not shown) may have an installation groove (not shown) formed therein for installing a stud (240), and a separate insulation member (not shown) may be provided on the upper part of the stud (240) in the installation groove to seal / insulate the installation groove.

[0039] The second insulation section (220) may be provided with puffs (221A, 221B) provided with reinforced polyurethane foam (R-PUF, Reinforced PUF) identical or similar to the first insulation section, and plywood (222) supporting the puffs (221A, 221B).

[0040] The puffs (221A, 221B) may be provided with a material having excellent thermal insulation properties, such as reinforced polyurethane foam (R-PUF, Reinforced PUF), and as an example, the puffs (221A, 221B) may be provided as an angle board (221A) on the corner side and a bottom board (221B) adjacent thereto at the corner portion of the cargo tank (200), and plywood (222) may be provided on each of the angle board (221A) and the bottom board (221B) to provide rigidity to the second insulation portion (220).

[0041] Unlike the round barrier (210R) on the angle board (221A) of the comparative example, the length of the round barrier (210R) is provided up to the end of the angle board (221A), and since the round barrier (210R) can be delivered to the site with straight studs (e.g., general M14 Stud) welded on it instead of the Collar Stud (40) of the comparative example, the number of hours for installing the Collar Stud (Stud (40)) and arc welding (welding the circumference of the wing (41) of the stud (40)) can be reduced, and material costs can also be reduced by not using the Collar Stud, which is more expensive than straight studs.

[0042] In addition, regarding the welding of the secondary barrier (210) / the secondary barrier (21) of the comparative example, the secondary barrier (21) of the comparative example is formed by a side view (field measurement) based on the stud (40) (see D2 in FIG. 3). The production of the side view secondary barrier (21) of the comparative example requires several steps, such as sending the side view value (D2) to the manufacturer, and then constructing a hole to install a metal block (30) in the secondary barrier (21) after the manufacturer has produced the secondary barrier (21), which results in significant loss of time and cost, and thus reduces productivity.

[0043] In particular, the secondary barrier (21) of the comparative example has a hole formed for installing the metal block (30), so it cannot be produced in advance and cut, and the hole must be formed after receiving it whenever necessary, so the preparation stage may be delayed.

[0044] On the other hand, in this embodiment, a hole for installing the metal block (30) is not formed in the second barrier (210), that is, the second barrier (210) only needs to be prepared in advance and cut (preparation is completed by simply cutting the end according to the current value (D1)), and the current is made on a round barrier (210R) that is not equipped with a stud (240), so production time can be reduced and costs can be reduced (costs related to hole processing are reduced).

[0045] And although not shown in the drawing, a support pad may be provided on the plywood (222), but the support pad may be omitted and a nut may be provided to be tightly fitted onto the plywood. In other words, if a support pad is provided, the nut may be attached to the stud (240) so as to be in close contact with the support pad, and if the support pad is omitted, it may be attached to the stud (240) so as to be in close contact with the plywood (222) to secure the round barrier (210R), and a plate washer (not shown) and a spring washer (not shown) may be further provided between the nut and the support pad / plywood (222).

[0046] A liquid cargo carrier (100) according to such an embodiment is provided with straight studs instead of rugal studs, and has a structure in which a round barrier (210R) covers the entire angle board (221A), making it easier to manufacture the cargo tank and thus improving profitability.

[0047] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without changing its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. Explanation of the symbols

[0048] 100: Ship 200: Cargo Hold 210: Second Barrier 220: Second insulation section

Claims

Claim 1 A liquid cargo carrier comprising a cargo hold having a space for accommodating liquid cargo, the liquid cargo carrier comprising: a round barrier provided at a corner portion formed at an incline in the cargo hold; a secondary barrier partially covering the round barrier; a second insulation portion comprising an angle board provided at the corner portion of the cargo hold and a bottom board adjacent to the angle board in a horizontal direction; and a stud penetrating the second insulation portion and a first insulation portion arranged in an up-and-down direction with the secondary barrier in between, wherein the round barrier extends to the position of the stud so that the stud is welded on the angle board. Claim 2 A liquid cargo carrier according to claim 1, wherein the round barrier extends to the end of the angle board to cover the entire side of the angle board. Claim 3 A liquid cargo carrier according to claim 1, wherein the secondary barrier covers the entire surface of one side of the bottom board and extends to the angle board to cover a part of the round barrier. Claim 4 A liquid cargo carrier according to paragraph 3, wherein the secondary barrier does not extend to the area where the stud is located and has an end formed before the area where the stud is located so as not to interfere with the stud. Claim 5 A liquid cargo carrier according to claim 1, wherein the stud is provided as a straight stud rather than a collar stud.

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