KR20150129892A - Sloshing diminishing unit and cargo barrier structure including the same - Google Patents

Abstract

Disclosed are a sloshing reducing unit and a cargo barrier structure including the same. The cargo barrier structure according to an embodiment of the present invention comprises: a lower insulation board arranged on an upper portion of an inner wall of a cargo hold; a secondary barrier placed on an upper portion of the lower insulation board; a primary barrier in contact with a cryogenic fluid; an upper insulation board interposed between secondary barrier and the primary barrier; and a plurality of sloshing reducing plates installed on an upper portion of the primary barrier, and having a plurality of through holes so that the fluid passes therethrough and flows into the primary barrier, in order to reduce sloshing loads by the fluid.

Description

Technical Field [0001] The present invention relates to a sloshing reduction unit and a sloshing reduction unit,

The present invention relates to a sloshing reduction unit and a cargo hold barrier structure including the sloshing reduction unit.

Cargo liquefied natural gas (LNG) cargo holds a liquefied natural gas cooled to approximately -163 ° C, so it is made of materials that can withstand cryogenic temperatures. It is resistant to thermal stress and heat shrinkage, and has an insulation structure . The cargo hold has a primary barrier, an upper insulation board, a secondary barrier and a lower insulation board in an outward direction from the inside, and is provided in a state of being coupled with an inner hull.

Here, the primary barrier is formed to have corrugated corrugation, and the corrugation is deformed by a certain amount when heat shrinkage occurs, thereby reducing the thermal stress at the welded portion. Since the primary barrier is in direct contact with LNG, which is a cryogenic fluid, and LNG sloshing occurs during operation, the corrugation may be warped or deformed by the sloshing load.

In order to reinforce the resistance against the sloshing load, a technique of inserting a reinforcing member into a corrugation has been proposed. For example, Korean Unexamined Patent Publication No. 2009-0094505 (published on September 10, 2009) discloses a technique of reinforcing rigidity by filling a filler of a non-combustible foam having a certain shape into a corrugation of a metal membrane (primary barrier) . However, it takes a considerable amount of work time and manpower to fill the filler into many corrugations, and it is technically difficult.

Korean Published Patent Application No. 2009-0094505 (published on September 10, 2009)

An embodiment of the present invention is to provide a sloshing reduction unit for protecting a primary barrier due to a sloshing load and installing an efficient cargo hold barrier, and a cargo barrier structure including the sloshing reduction unit.

According to an aspect of the present invention, a lower insulation board disposed on an upper portion of a cargo hold inner wall; A secondary barrier disposed above the lower heat insulating board; A primary barrier in contact with the cryogenic fluid; An upper insulating board interposed between the secondary barrier and the primary barrier; And a sloshing reduction plate provided at a plurality of upper portions of the primary barrier to reduce a sloshing load caused by the fluid and having a plurality of through holes through which the fluid flows to the primary barrier, A cargo hold barrier structure may be provided.

Further comprising a support plate disposed at an upper portion of the primary barrier and having a stud bolt vertically fixed on an upper surface thereof, the sloshing reduction plate being formed to be convex upward to correspond to thermal stress caused by the fluid, A curved surface portion having a through hole formed therein and an engaging portion extending from the curved surface portion to both side end portions and coupled to the stud bolt.

The support plate may be disposed at a position corresponding to each edge of the sloshing reduction plate, and the engagement portion may be formed at each of the corner portions and coupled to the stud bolt.

The support plate may be coupled to a seating groove formed at regular intervals on the flat surface of the primary barrier.

The support plate may be formed in a circular shape corresponding to the seating groove, and may be joined to the seating groove by circular welding.

And a fastening member fastened to the stud bolt in a state where the engaging portion of the sloshing abatement plate on both sides is engaged with the stud bolt to tightly fix the engaging portion of the sloshing abatement plate to each other.

Wherein the lower insulation panel includes a lower protection plate, a lower insulation member on the lower protection plate, and a lower auxiliary panel interposed between the secondary barrier and the lower insulation member, and a stud bolt is vertically fixed on a central portion of the lower auxiliary panel, And the secondary barrier is disposed to cover a space formed between the lower heat insulating boards on both sides and is connected to another secondary barrier adjacent to the stud bolt at the center thereof and is provided at a peripheral portion corresponding to a position where the stud bolt is installed It is possible to form a joint surface to be joined to the fixed piece by the original welding method.

The support plate may be installed at predetermined intervals on a weld line where welding is performed between the primary barriers.

Wherein the lower heat-insulating board has a predetermined thickness and is formed in the shape of a square having the same width and the same length, the upper heat-insulating board is disposed so as to extend over the lower heat-insulating board on both sides, A connection board may be disposed in a space formed between the upper heat insulating boards so as to be disposed on the same plane as the upper heat insulating board.

According to another aspect of the present invention, there is provided a supporting plate comprising: a support plate disposed at regular intervals above a primary barrier contacting a cryogenic fluid of a cargo hold, the stud bolt vertically fixed on an upper surface thereof; And a sloshing abatement plate provided at a plurality of upper portions of the primary barrier in the same direction as the installation direction of the primary barriers in order to reduce a sloshing load caused by the fluid, A curved surface portion formed to be convex upward to correspond to thermal stress by the curved surface portion and having a plurality of through holes through which the fluid passes and a coupling portion extending from the curved surface portion to both side ends to be coupled to the stud bolt have.

And a fastening member fastened to the stud bolt in a state where the engaging portion of the sloshing abatement plate on both sides is engaged with the stud bolt to tightly fix the engaging portion of the sloshing abatement plate to each other.

The sloshing reduction unit and the cargo barrier structure including the sloshing reduction unit according to the embodiment of the present invention protect the primary barrier due to the sloshing load and allow efficient installation of the cargo barrier.

In addition, it is possible to overcome the limitations of conventional barrier arrangements using the primary secondary barrier and the secondary secondary barrier, and to install the secondary barrier easily and efficiently.

In addition, the horizontal and vertical lengths of the lower heat-insulating board are formed in accordance with the same set dimensions, and the secondary walls are connected to each other around the stud bolts vertically fixed to the fixing pieces provided on the center of the lower heat- By installing the upper insulation board in such a manner that the corner portions of the upper insulation board are combined, the cargo barrier can be effectively installed with a small number of people and time.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view of a vessel cargo hold wall structure according to an embodiment of the present invention.
Fig. 2 is a perspective view of the lower insulation board arrangement of the barrier structure of Fig. 1. Fig.
FIG. 3 is a perspective view illustrating a state in which a secondary barrier is provided on the lower heat-insulating board of FIG. 2. FIG.
FIG. 4 is a perspective view illustrating a state in which an upper heat insulating board is installed on the upper part of the secondary barrier shown in FIG. 3. FIG.
FIG. 5 is a cross-sectional view illustrating a coupling relationship between the upper and lower insulating boards of FIG. 4; FIG.
FIG. 6 is a perspective view illustrating a state in which a connection board is installed between the upper heat insulating boards of FIG.
FIG. 7 shows a configuration in which a primary barrier and a sloshing reduction plate are installed in the barrier structure of FIG. 1;
8 is a cross-sectional view of the installation of the sloshing reduction plate of FIG.
FIG. 9 shows a support plate provided for installing the sloshing reduction plate of FIG. 7 and a stud bolt vertically fixed on the upper surface thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below, but may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

Referring to FIG. 1, a barrier structure of a vessel cargo hold that stores a cryogenic fluid (e.g., liquefied natural gas (LNG)) according to an embodiment of the present invention includes a lower insulation board 110, a secondary barrier 120, A board 130 and a connection board 135. For convenience of explanation, a configuration in which the primary barrier 170 is disposed is shown in Fig.

The lower insulation board 110 is arranged in a plurality of rows and columns in the upper part of the inner wall of the cargo hold and has a lower protection plate 111, a lower insulation member 112, And a lower sub-panel (113). The lower heat-insulating board 110 may be formed as a unitary unit and arranged side by side on the inner wall of the cargo hold. The lower heat-insulating board 110 may have a predetermined thickness and may have a square shape having the same width and the same length. For example, the lower insulating board 110 may be manufactured to have a size of 1 m having the same length and width.

The lower protection plate 111 may be fixed to the inner wall of the cargo hold by a mastic, a stud bolt or the like. The lower protection plate 111 can be made of, for example, a material such as plywood. The lower heat insulating member 112 is disposed on the lower protective plate 111 and is made of a polyurethane foam (PUF), a reinforced polyurethane foam (RPUF, Reinforced PUF) or the like to protect the hull from the cryogenic fluid can do. The lower heat insulating member 112 may be bonded to the upper portion of the lower protective plate 111 by an adhesive (e.g., glue or the like).

Referring to FIG. 2, a fixing piece 210 having a stud bolt 211 vertically fixed is provided on a central portion of the lower sub-panel 113. The fixing piece 210 may be made of a metal material including, for example, stainless steel or the like. The fixing member 210 may be coupled to the coupling groove 113a formed in the lower sub-panel 113 and fixed by a fastening member 2 such as a rivet or the like. The fixing piece 210 may be formed in a circular shape. The lower sub-panel 113 may be made of plywood or the like.

3, the secondary barrier 120 is disposed on the lower insulation board 110 to cover a space formed between the lower insulation boards 110 on both sides of the lower insulation board 110, And are arranged side by side to be connected to the other secondary barrier 120. Although not shown, a filling member such as a glass wool may be inserted into the space formed between the lower heat insulating boards 110. However, the filling member may be omitted when the neighboring lower heat insulating boards 110 are arranged closely to each other or when the lower heat insulating boards 110 are integrally formed by bundling the lower heat insulating boards 110 in close contact with each other.

The secondary barrier 120 forms bonding surfaces 120a and 120b to be welded (W, see FIG. 5) to the fixing piece 210 at a peripheral portion corresponding to the position where the stud bolt 211 is installed. At this time, the joining surfaces 120a and 120b may be joined to the fixing piece 210 in a circular welding manner. The joining surfaces 120a formed at both ends of the joining surfaces 120a and 120b form a semicircular groove so that the joining surfaces 120a of the adjacent secondary walls 120 adjacent to the stud bolts 211, And the joint surface 120b formed at the corner may be chamfered and formed obliquely inclined. The periphery of the neighboring secondary barrier 120 can be partially welded to each other with the stud bolt 211 as a center. In the conventional hold wall structure, the lower insulation board is generally formed in a rectangular shape, and accordingly, the length of welding between the main secondary barrier and the auxiliary secondary barrier is long, There were difficult aspects. The lower insulation board 110 may be manufactured in the above-described manner and disposed above the inner wall of the cargo hold, and the secondary barrier 120 may be disposed thereon by the above-described method. In addition, it is possible to overcome the limitations of conventional barrier arrangements using the primary secondary barrier and the auxiliary secondary barrier, and uniformly install the secondary barrier 120 of a single product easily and efficiently.

The secondary barrier 120 may have a portion 120c covering a space formed between the lower heat insulating boards 110 in a corrugated shape having a downward convex shape. This is to effectively cope with heat shrinkage due to the cryogenic fluid. The secondary barrier 120 may have a lateral length equal to the lateral length of the lower insulating board 110 and a vertical length equal to three times the vertical length of the lower insulating board 110. Through this, the secondary barrier 120 can cover four longitudinally arranged lower heat-insulating boards 110 and two laterally arranged lower heat-insulating boards 110. For example, the secondary barrier 120 may have a length of 1 m and a length of 3 m. The secondary barrier 120 may be composed of a plurality of sheets made of a metal material such as stainless steel, aluminum, brass, zinc, or the like. As another example, a composite sheet made of a metal sheet and a fiber reinforced composite material may be provided.

Referring to FIG. 4, the upper insulating board 130 is interposed between the secondary barrier 120 and the primary barrier 170 (see FIGS. 7 and 9), and includes an upper protective plate 131, (132). The upper insulating board 130 may have a predetermined thickness and may have the same length and width. In addition, the upper heat insulating board 130 may be formed in the same shape and size as the lower heat insulating board 110.

The upper protection plate 131 may be made of a material such as plywood. The upper heat insulating member 132 may be made of a polyurethane foam material, a reinforced polyurethane foam, or the like to protect the hull from the cryogenic fluid. The upper insulating board 130 is disposed on the lower insulating board 110 on both sides and is disposed at a predetermined interval on the secondary barrier 120 in such a manner that the corner portions are coupled to the stud bolts 211 . As shown in FIG. 4, the upper heat insulating board 130 covers two lower heat insulating boards 110 on both sides, and each corner is connected to the stud bolts 211 of the lower heat insulating board 110 . Accordingly, the space formed between the lower insulating boards 110 is covered by the upper insulating board 130, thereby preventing the leakage of the cryogenic fluid and improving the heat insulating effect.

5, the upper insulating board 130 includes an upper auxiliary panel 134 interposed between the upper insulating member 132 and the secondary barrier 120, an upper auxiliary panel 134 and a secondary barrier 120 To protect the cargo barrier walls from sloshing shocks caused by liquefied gas stored in the interior of the cargo hold. The shock absorbing layer 133 may be omitted in another example. The upper sub-panel 134 may be made of plywood or the like. The shock absorbing layer 133 may be made of, for example, melamine foam as a foam material. Melamine foam is an open type foam based on amino resin type melamine resin, which not only absorbs impact but also has excellent heat insulation performance. However, the present invention is not limited to this, and the shock absorbing layer 133 may be made of various materials capable of protecting the cargo barrier from the sloshing shock caused by the liquefied gas stored in the cargo hold. The upper insulating board 130, the upper auxiliary panel 134, and the impact absorbing layer 133 may be integrally formed.

Each of the corners of the upper insulating board 130 is formed with an inner hole 130a so that the washer 212 and the nut 213 inserted through the inner hole 130a are inserted into the impact absorbing layer 133 and the upper auxiliary panel 134, And the washer 212 presses the upper sub-panel 134 by tightening the nut 213. The nut 213 is fastened to the stud bolt 211 protruding toward the inner hole 130a through the through- A plug member (not shown) filled with a foam or the like may be disposed in the inner hole 130a and may be finished by a cover (not shown) made of plywood or the like.

Referring to FIG. 6, the connection board 135 is interposed in a space formed between the upper heat insulation boards 130. Thereby, a space formed between the lower heat insulating boards 110, which is not covered by the upper insulating board 130, is covered by the connecting board 135. The connection board 135 is sandwiched between the upper insulation boards 130 and bonded to the neighboring upper insulation board 130 by an anchor plate 150 to be described later. The connection board 135 is sandwiched between the upper heat insulation boards 130 in a form of covering two lower insulation boards 110 on both sides.

The connection board 135 includes a connection protection plate 136 and a connection insulation member 137 below the connection protection plate 136 so as to be coplanar with the upper insulation board 130. Although not shown, when the upper heat insulating board 130 further includes the shock absorbing layer 133 and the upper sub-panel 134 so that the connecting board 135 is coplanar with the upper insulating board 130, And may further include corresponding members respectively. At this time, each member may be made of the same material and thickness as the impact absorbing layer 133 and the upper sub-panel 134.

The connection protection plate 136 and the connection insulation member 137 may be made of the same material as the upper protection plate 131 and the upper insulation member 132, respectively. At this time, the upper insulating board 130 and the connecting board 135 are inserted into grooves formed on one side surface of the upper insulating board 130 and one side of the connecting board 135. Either one of the opposite ends is fixed and the other is connected to the upper insulating board 130 and the connecting board 135 An anchor plate 150 may be provided to bind the upper insulating board 130 and the connecting board 135 in a manner to press one of them. For example, when one side of the anchor plate 150 is coupled to the upper heat insulating board 130 by a fastening member such as a rivet or the like, the other side of the anchor plate 150 presses the neighboring connecting board 135.

In addition, the strip member 160 is inserted into the groove formed in the upper protective plate 131 so as to move in accordance with the expansion and contraction of the primary barrier 170 (see Fig. 7). A primary barrier 170 is disposed on the upper portion of the strip member 160 and the strip member 160 moves according to the movement of the primary barrier 170 which expands and contracts due to thermal stress. This can alleviate the thermal stress and improve the durability of the cargo barrier walls. The primary barrier 170 may be provided in such a manner as to press the upper portion of the strip member 160 so that the strip member 160 moves together with the contraction expansion of the primary barrier 170. The strip member 160 may be made of, for example, stainless steel or the like.

Referring to FIGS. 7 and 8, the primary barrier 170 is installed on the upper protective plate 131 to be in contact with the cryogenic fluid. The primary barrier 170 may be made of a metal material such as stainless steel (SUS) or the like. At this time, the sloshing reduction plate 300 is installed to prevent the corrugation 170b from being bent or deformed due to an impact on the primary barrier 170 due to the sloshing load of the fluid.

A plurality of sloshing reduction plates 300 are installed on the primary barrier 170 in the same direction as the installation direction of the primary barrier 170 and are provided with a plurality of through- And may have a rectangular shape with a hole H1 formed thereon. The sloshing reduction plate 300 may be made of the same material as the primary barrier 170 and may be installed side by side in rows and columns at regular intervals. The sloshing abatement plate 300 is disposed facing the primary barriers 170 installed in the transverse and longitudinal directions, and is configured such that the fluid directly impacts the primary barriers 170 while the fluid is loaded by the sloshing Can be effectively prevented. Here, the through hole H1 can also perform a function of crushing and dispersing the sloshing load.

The sloshing reduction plate 300 is formed to be convex upward to correspond to the thermal stress caused by the fluid and includes a curved surface portion 300a having a through hole H1 formed therein and extending from the curved surface portion 300a toward both side ends, And a planar fitting portion 300b which is coupled to the stud bolt 311 of the plate 310. [

The support plates 310 are disposed at regular intervals on the flat surface 170a of the primary barrier 170 and the stud bolts 311 are vertically fixed to the upper surface by welding. The stud bolts 311 may be integrally formed with the support plate 310. At this time, the support plate 310 is disposed at a position corresponding to each corner of the sloshing reduction plate 300, and the coupling portion 300b is formed at each corner of the sloshing reduction plate 300, and the stud bolt 311 ). ≪ / RTI >

Referring to FIG. 8, the support plate 310 may be coupled to a seating groove H2 formed at regular intervals on the flat surface 170a of the primary barrier 170. As shown in FIG. So that the support plate 310 can be coplanar with the primary barrier 170. The support plate 310 is formed in a circular shape corresponding to the seating groove H2 and can be joined to the seating groove H2 by circular welding.

When the engaging portion 300b of the sloshing reduction plate 300 on both sides is engaged with the stud bolt 311, the nut 313 is fastened to the stud bolt 311 as a fastening member, Can be closely fixed to each other. The installation and disassembly of the sloshing reduction plate 300 is facilitated through the sloshing reduction plate 300 and the sloshing reduction unit including the support plate 310 and the nut 313, have.

9, the support plate 310 to which the stud bolts 311 are fixed may be provided at the weld line L where welding is performed between the primary barriers 170. Here, the support plate 310 may be welded to the upper end of the weld line L.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

110: lower insulation board 111: lower protection board
112: lower insulation member 113: lower sub-panel
120: secondary barrier 130: upper insulation board
131: upper protection plate 132: upper insulation member
133: shock absorbing layer 134: upper auxiliary panel
135: connection board 136: connection board
137: connection insulating member 150: anchor plate
160: strip member 170: primary barrier
300: sloshing reduction plate 310: support plate
311: Stud bolt 313: Nut

Claims (11)

A lower insulation board disposed above the inner wall of the cargo hold;
A secondary barrier disposed above the lower heat insulating board;
A primary barrier in contact with the cryogenic fluid;
An upper insulating board interposed between the secondary barrier and the primary barrier; And
And a sloshing reduction plate provided at a plurality of upper portions of the primary barrier to reduce a sloshing load caused by the fluid, wherein the sloshing reduction plate has a plurality of through holes for allowing the fluid to flow to the primary barrier, Barrier structure. The method according to claim 1,
Further comprising a support plate disposed at an upper portion of the primary barrier and having a stud bolt vertically fixed on an upper surface thereof,
The sloshing reduction plate
A curved surface portion formed upwardly to correspond to thermal stress caused by the fluid, the curved surface portion having the through hole,
And a coupling portion extending from the curved portion to both side ends to be coupled to the stud bolt. 3. The method of claim 2,
Wherein the support plate is disposed at a position corresponding to each corner of the sloshing reduction plate,
And the coupling portion is formed at each of the corner portions and is coupled to the stud bolt. 3. The method of claim 2,
Wherein the support plate is coupled to a seating groove formed at regular intervals on a flat surface of the primary barrier. 5. The method of claim 4,
Wherein the support plate is formed in a circular shape corresponding to the seating groove, and is joined to the seating groove by circular welding. 3. The method of claim 2,
Further comprising: a fastening member fastened to the stud bolt in a state where the engaging portion of the sloshing abatement plate on both sides is engaged with the stud bolt, thereby closely fixing the engaging portions of the sloshing abatement plate to each other. 3. The method of claim 2,
Wherein the support plate is provided at a predetermined interval in a welding line portion where welding is performed between the primary walls. The method according to claim 1,
Wherein the lower insulation panel includes a lower protection plate, a lower insulation member on the lower protection plate, and a lower auxiliary panel interposed between the secondary barrier and the lower insulation member, and a stud bolt is vertically fixed on a central portion of the lower auxiliary panel, Lt; / RTI &
Wherein the secondary barrier is disposed to cover a space formed between the lower heat insulating boards on both sides and is connected to another secondary barrier adjacent to the stud bolt and has a peripheral portion corresponding to a position where the stud bolt is installed, The structure of the cargo hold barriers with the joint surfaces joined by the original welding method. 9. The method of claim 8,
The lower heat-insulating board has a predetermined thickness and a square shape having the same width and the same length,
Wherein the upper insulating board is disposed on the lower insulating board on both sides and is disposed at an upper portion of the secondary barrier in such a manner that corner portions are coupled to the stud bolt,
Wherein a connection board is interposed in a space formed between the upper heat insulating boards so as to be disposed on the same plane as the upper heat insulating board. A support plate disposed at an upper portion of the primary barrier contacting the cryogenic fluid of the cargo hold and having stud bolts vertically fixed on the upper surface thereof; And
And a plurality of sloshing reduction plates installed on the primary barrier in the same direction as the installation direction of the primary barrier to reduce a sloshing load caused by the fluid,
The sloshing reduction plate
A curved surface portion convex upwardly corresponding to thermal stress caused by the fluid and having a plurality of through holes through which the fluid passes,
And a coupling portion extending from the curved surface portion to both side ends and coupled to the stud bolt. 11. The method of claim 10,
Further comprising: a fastening member fastened to the stud bolt in a state where the engaging portion of the sloshing abatement plate on both sides is engaged with the stud bolt, thereby closely fixing the engaging portion of the sloshing abatement plate to each other.

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