KR100993931B1 - Lng carrier having mixing cargo - Google Patents

Abstract

The present invention relates to a LNG carrier having a mixed cargo hold, wherein the inner hull leading to the upper side of the independent cargo hold is formed with the same width as the inner hull leading from the membrane cargo hold to secure the longitudinal strength, and the longitudinal steel. Part of the area leading from the securing portion is removed, characterized in that it is composed of an opening opening one side toward the bow side. Therefore, according to the present invention, by changing the structure of the inner hull leading to the upper side of the independent cargo hold, it is possible to satisfy the longitudinal strength in the area where the independent cargo hold and the membrane cargo hold meet, while providing a work insulation space of the independent cargo hold to improve workability. In addition, the manufacturing cost can be reduced by reducing the area of the inner hull.

LNG carrier, LNG regasifier, FSRU, FPSO, cargo hold, freestanding, membrane type

Description

LNG carrier with mixed cargo hold {LNG CARRIER HAVING MIXING CARGO}

The present invention relates to a LNG carrier in which the cargo hold is mixed in a membrane type and a stand alone, and more specifically, by changing the inner structure of the inner hull between the membrane hold and the stand alone cargo hold, the workability of the stand alone cargo hold is improved. A liquefied natural gas carrier having a mixed cargo hold.

The cargo hold used in LNG carriers is generally applied to the same type, and typical cargo holds include membrane, self supporting prismatic, and moss.

These holds have their advantages and disadvantages, especially membrane holds are easy to increase in length or width, but are vulnerable to sloshing, and in recent years, polar operations have increased. When the hull structure is deformed, damage to the outer wall of the cargo hold may cause gas leakage. On the other hand, SPB (Self Supporting Prismatic) type and Morse type standalone type are strong against sloshing and external shock, but have an expensive disadvantage.

For this reason, recently, a method of mixing and placing a membrane type cargo hold and a stand alone cargo hold has been developed.

In the case of membrane type and independent type cargo hold, independent type is generally arranged in the bow part to minimize damage caused by external impact, and a plurality of membrane types may be arranged in the stern part.

1 is a schematic configuration diagram of a LNG carrier of a mixed cargo hold being developed.

An inner hull 110 is formed along the longitudinal direction of the outer hull 100 with a ballast tank (unsigned) interposed inside the outer hull 100 of the hull, which is the outer surface of the LNG carrier. Inside the hull 110, a plurality of membrane-shaped cargo hold 120 composed of primary and secondary barriers are arranged horizontally from the stern side. And it has a configuration that the independent cargo hold 130 is installed on the bow side so as to continue from the membrane-shaped cargo hold 120.

For reference, FIG. 2A schematically illustrates a cross section of a membrane hold and FIG. 2B shows a stand alone hold.

The membrane-shaped cargo hold 120 of FIG. 2A is composed of a double hull outer hull 100 and a hull inner hull 110, and includes a secondary insulation panel barrier and a primary corrugation inside the inner hull 110. A cargo hold 122 composed of a gated membrane is installed, and the independent cargo hold 130 of FIG. 2B is composed of a double hull outer hull 100 and a hull inner hull 110, and an inner hull 110. An independent cargo hold 134 for storing liquefied natural gas is spaced apart from each other, and an insulating member 132 is attached to an outer surface of the cargo hold 134. And the cargo hold 134 has a structure supported by the support member 136 located on the inner hull 110.

As described above, the independent cargo hold is a structure in which a separate cargo hold is independently present in the inner hull.

However, in the case of a mixed cargo hold, the inner hull leading from the membrane cargo hold extends to the independent cargo hold for structural continuity.

Since the bow side area where the independent cargo hold is installed is located in the middle of the hull with the highest bending momemt demand, the inner hull is preferably installed to the independent cargo hold to secure the longitudinal strength. The required value of the figure becomes smaller and becomes an unnecessary part, and furthermore, when the inner hull is installed, there is a problem in that the work space for installing the heat insulating member in the cargo hold is narrow and the workability is reduced.

Therefore, in the present invention, the structure of the inner hull leading to the upper side of the independent cargo hold can be satisfied with the longitudinal strength in the area where the independent cargo hold and the membrane cargo hold meet, while liquefied with a mixed cargo hold changed to provide a thermal insulation work space of the independent cargo hold. Its purpose is to provide natural gas carriers.

In order to achieve the above object, the present invention is a liquefied natural gas carrier having at least one membrane cargo hold is installed and the independent cargo hold is installed on at least one of the bow side and the stern side, the inner of the upper side of the membrane cargo hold The inner hull, which extends from the hull and is located above the independent cargo hold, is formed to have the same width as the inner hull above the membrane-shaped cargo hold so as to secure the longitudinal strength, and from the longitudinal steel securement section. The present invention provides a liquefied natural gas carrier having a mixed cargo hold having an opening opening toward the bow side or the stern side of the independent cargo hold.

Here, preferably, the opening has an opening width increased toward the opening side to provide an insulation construction space for the independent cargo hold, and more preferably, the opening has a semicircle or a polygonal shape.

According to the liquefied natural gas carrier having the mixed cargo hold of the present invention as described above, by changing the structure of the inner hull leading to the upper side of the independent cargo hold, the longitudinal strength can be satisfied in the area where the independent cargo hold and the membrane cargo hold meet, Insulating work space of the independent cargo hold to improve workability, there is an effect that can reduce the production cost by reducing the area of the inner hull.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be made based on the contents throughout the specification.

3A-3C are plan views of an inner hull leading to a stand alone cargo hold in accordance with an embodiment of the present invention.

Referring to FIG. 1 of the related art, a LNG carrier equipped with a mixed cargo hold is a floating offshore crude oil production and storage facility ship (FPSO) that is directly supplied with crude oil by floating in the sea, or regasifies fluid in a floating state at sea. The LNG regasification ship (RV) or the floating natural gas storage ship (FSRU) is used to supply the onshore facilities through submarine tunnels. One or more membrane cargo holds 120 are mixed.

The number of membrane-shaped cargo hold 120 and the independent cargo hold 130 may be appropriately changed depending on the size of the carrier.

The independent cargo hold 130 is, for example, a Moss type or an IHI-SPB type, which is relatively expensive to produce, but strong in sloshing, so that the sloshing phenomenon due to the hull movement is severe. And may be disposed on the stern side, respectively. As shown, one independent cargo hold 130 is installed on the bow side.

And the membrane-shaped cargo hold 120 is, for example, Mark-III type between the independent cargo hold 130 is arranged in succession from the independent cargo hold 130 installed on the bow side or stern side or between the independent cargo hold 130, respectively. Is placed.

That is, the membrane-shaped cargo hold 120 is installed to avoid the bow side or stern side that may be affected by the sloshing, it is possible to prevent a safety accident due to the sloshing.

As shown in FIG. 2A, an inner hull 110 is formed along a longitudinal direction of the membrane-shaped cargo hold 120, and the first and second barriers are formed inside the inner hull 110. Cargo hold 122 is configured to be installed.

The inner hull 110 including the membrane-shaped cargo hold 120 therein extends to the independent cargo hold 130 positioned on the bow side along the outer hull 100 of the hull.

Here, the inner hull 112 located above the independent cargo hold 130 will be described with other reference numerals for convenience of description.

Inner hull 112 is preferably installed up to the independent cargo hold in order to secure the bending moment (bending momemt) of the continuity of the structure and longitudinal strength, but the required strength of the longitudinal strength is smaller toward the bow side, and becomes an unnecessary part, moreover, independent cargo hold The work space of the heat insulating member 132 installed inside the 130 is narrow, and workability may be reduced.

Therefore, the inner hull 112 positioned above the independent cargo hold 130 is extended from the inner hull 110 of the membrane cargo hold 120 to secure longitudinal strength, and the inner hull of the membrane cargo hold 120 is provided. And a longitudinal hole securing unit 112a having the same width and thickness as that of the 110. In addition, the inner hull 112 includes an opening 112b which is formed after the longitudinal hole securing unit 112a and opened toward the bow side or the stern side to secure a working space of the heat insulating member 132 (FIGS. 3 to 3). See FIG. 3C).

The working space of the heat insulating member 132 inside the independent cargo hold 130 is widened by the opening 112b. In addition, since the amount of the member corresponding to the volume of the opening 112b does not need to be used when the inner hull 112 is manufactured, a manufacturing member reduction effect of the inner hull 112 may be obtained. The opening 112b is removed with a predetermined width from both side end portions of the longitudinal cavity securing portion 112a to the inside, and the opening width is increased toward the opening side so that the shape of the opening 112b is a semicircle, a triangle, or other polygonal shape. Have

As described above, the required value of the longitudinal strength decreases toward the bow side, so that the inner hull 112 may have a shape in which the area of the opening 112b gradually increases toward the bow side to secure sufficient working space.

The operation of the liquefied natural gas carrier having a mixed cargo hold made of such a structure is made as follows.

The independent cargo hold 130 is installed on the bow side where the change and reinforcement by the impact of ice is most needed during polar operation, and the membrane-shaped cargo hold 120 is disposed on the central part and the stern side where the ice load and deformation are relatively small. The vessel is an economical form while minimizing the risk, and furthermore, by installing the independent cargo hold 130 on the bow side can minimize the sloshing problem.

In this way, the inner hull 112 leading to the upper side of the independent cargo hold 130 in the carrier having a mixed cargo hold is required for securing the longitudinal strength as described above, but as in the embodiment illustrated in the present invention, Longitudinal strength is secured through the longitudinal hole securing unit 112a having the same cross-sectional area as the inner hull 112, and a working space can be secured through the opening 112b.

Therefore, in the present invention, the inner hull 112 leading to the independent cargo hold 130 is changed to a shape capable of securing a longitudinal strength while providing a working space.

What has been described above is only one preferred embodiment of the LNG carrier having a mixed cargo hold according to the present invention, the present invention is not limited to the above embodiment, as claimed in the following claims Without departing from the gist of the present invention, anyone of ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

1 is a schematic configuration diagram of a liquefied natural gas carrier of the conventional mixed cargo hold,

2a and 2b is a cross-sectional view of a conventional membrane-shaped cargo hold and independent cargo hold,

3A-3C are plan views of an inner hull leading to a stand alone cargo hold in accordance with an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: outer hull 110, 112: inner hull

112a: longitudinal secured portion 112b: opening

120: membrane-type cargo hold 122, 134: cargo hold

130: independent cargo hold 132: insulation member

Claims (3)

In a LNG carrier having a mixed cargo hold in which at least one membrane cargo hold is installed and the independent cargo hold is installed in at least one of the bow side and the stern side, The inner hull that extends from the inner side of the membrane cargo hold and the upper side of the independent cargo hold, Longitudinal steel securing unit formed with the same width as the inner hull of the membrane-shaped cargo hold to secure the longitudinal strength, Opening openings extending from the longitudinal hole securing portion to the bow side or the stern side where the independent cargo hold is installed LNG carrier having a mixed cargo hold. The method of claim 1, The opening is, Liquefied natural gas carriers having a mixed cargo hold provided the insulation width of the independent cargo hold is increased toward the opening side. The method according to claim 1 or 2, The opening is a LNG carrier having a mixed cargo hold in a semi-circle or polygonal shape.

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