KR20100022679A - Angle pieces for mounted on corner panel of lng cargo containment system - Google Patents

Abstract

PURPOSE: An angle piece which is mounted on a corner panel of a liquefied natural gas cargo space is provided to prevent stress from being focused on a corner part membrane structure of the liquefied natural gas cargo space due to the deformation and thermal transformation of a hull. CONSTITUTION: An angle piece which is mounted on a corner panel of a liquefied natural gas cargo space comprises a body(102) and a stress dispersion part(104). The stress dispersion part is perpendicularly projected on the body. The body is round shape with the same curvature which is bent in rounded inner surface of the corner panel. The stress dispersion part disperses the stress by protruding the length of a rounded surface of the body. The angle piece is made of SUS(Steel Use Stainless). The angle piece constitutes a first barrier. The stress dispersion part comprises at least one corrugation parts.

Description

ANGLE PIECES FOR MOUNTED ON CORNER PANEL OF LNG CARGO CONTAINMENT SYSTEM}

The present invention prevents stress concentration due to hull deformation and heat deformation at the corners of the LNG cargo hold, thereby eliminating the possibility of breaking the secondary barrier and greatly improving weldability. An angle piece to be installed in the corner panel of the gas hold.

In general, liquefied natural gas (LNG) refers to a colorless transparent cryogenic liquid whose natural gas, which contains methane as its main component, is cooled to -163 ° C and its volume is reduced to one hundredth.

As such liquefied natural gas is used as an energy resource, an efficient transportation method that can transport a large amount from the production base to the destination of the demand site has been considered to use this gas as energy. LNG carriers have been developed to transport gas by sea.

By the way, the LNG carrier should be provided with a cargo hold (Cargo) that can store and store the liquefied natural gas liquefied in the cryogenic state, there was a lot of difficulties due to the very demanding conditions for such cargo hold.

That is, since LNG has a vapor pressure higher than atmospheric pressure and has a boiling temperature of about -162 ℃, in order to safely store and store such LNG, the cargo hold for storing the LNG is a material that can withstand ultra low temperatures, for example, For example, it must be made of aluminum steel, stainless steel, 35% nickel steel, etc., and must be designed with a unique insulation structure that is resistant to other thermal stresses and heat shrinkage and prevents heat intrusion.

Referring to the cargo hold insulation structure of a conventional LNG carrier with reference to the accompanying drawings as follows.

1 is a cross-sectional view showing a cargo hold insulation structure of a liquefied natural gas carrier according to the prior art. As shown, the bottom insulation panel 10 is fixed to the inner side of the hull 1 of the LNG carrier by an epoxy mastic 13 and a stud bolt 14. It is attached and fixed via 10a).

At this time, a rigid triplex 22 is interposed between the lower insulation panel 10 and the top insulation panel 20 to be bonded to each other. Meanwhile, when attaching the lower insulation panel 10 to the cargo hold wall, the lower insulation panel 10 may be inserted into a gap 40 formed between glass wool flat joints 18. ) Have a gap.

Then, the top bridge panel 28 is attached between the upper insulation panels 20, with the epoxy triplet 24 on the rigid triplex 22 attached to the upper insulation panel 20. triplex) and top bridge panel 28 is attached using epoxy glue 24 thereon.

In addition, the upper insulation panel 20 and the upper portion of the top bridge panel 28 have the same plane, and a corrugated membrane 30 is attached to the same plane through the anchor strip 32. Cargo wall is complete. Here, the method of assembling the inner surface of the hull 1 and the lower insulation panel 10 of the LNG carrier further includes attaching the stud bolts 14 to the inner wall of the hull 1 by resistance welding, and insulating the lower insulation. The panel 10 is pre-formed with holes into which the stud bolts 14 can be inserted. Therefore, the assembly is completed by fastening the nut 14a to the stud bolt 14 and inserting the cylindrical foam plug 15 into the hole formed in the lower insulation panel 10.

On the other hand, in the cargo hold structure of the LNG carrier according to the prior art, the corner portion needs to be manufactured differently from the flat plate portion, and the corrugated membrane applied to the cargo hold corner portion of the LNG carrier is suitable for the shape of the cargo hold corner portion. It is manufactured in a single piece form (angle piece).

Figure 2 is a cross-sectional view showing an angle piece applied to the cargo hold insulation corner structure of the LNG carrier according to the prior art, US patent US809742.

As shown, the angle piece (40: piece) installed in the corner portion of the cargo hold has two planar portions meet at right angles, there are wrinkles to cope with the primary barrier shrinkage in the direction of the arrow when loading LNG, two wrinkles Sites that intersect additionally at right angles are additionally equipped with complex internal folds.

As described above, the insulating corner panel (not shown) structure applied to the cargo hold corner of the LNG carrier according to the prior art has two sides formed by the hull deformation because the radius of curvature of the intersection is folded at right angles. When the angle is changed, there is a disadvantage in that stress concentration occurs in the folded portion of the perpendicular to the membrane structure applied to the top. In order to prevent such stress concentration, in recent years, since the corner panel structure of the cargo hold has been changed from a right angle to a round shape, it is required to manufacture a suitable angle piece for the cargo hold corner. In addition, different corner panels are located at both bottoms based on the pleats and are connected to each other by angle pieces. If there are steps between the two corner panels, the angle pieces must be bent to some extent and bent in this direction. It is difficult to deform because of its rigidity.

The present invention has been made to solve the above problems, the angle piece installed in the gap between the corner panels of the cargo hold is formed in a round shape as a whole to have the same curvature as the corner panel shape, semi-circle in the center to achieve stress dispersion By forming the stress dispersion protruding in the form, it is possible to prevent stress from concentrating on the corner membrane structure of the LNG cargo hold due to hull deformation and thermal deformation, and to improve weldability.

In the angle piece installed on the corner panel of the LNG cargo hold according to the present invention, a round-shaped body having the same curvature along the rounded inner surface of the corner panel, and a semicircle in the center along the length of the curvature surface of the body It provides an angle piece which is installed in the corner panel of the LNG cargo hold including a stress dispersing portion to protrude in a form to disperse stress concentration.

And preferably the angle piece is made of SUS (Steel Use Stainless) material is produced by extrusion, characterized in that the primary barrier.

Also preferably, at least one wrinkle portion is formed in the stress distribution portion, and is a "V" or "U" shaped bone wrinkle, characterized in that the cross-sectional shape is formed at a predetermined ratio along the curvature.

The present invention, the shape of the angle piece installed in the gap between the corner panels of the cargo hold is formed to have a curvature of a round shape as a whole, by forming a stress dispersion portion protruding in a semicircular shape in the center to achieve stress dispersion, hull (hull) It is possible to prevent stress concentration at the corners of the LNG cargo hold due to deformation and thermal deformation of) and to improve weldability.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

3 is a perspective view illustrating an angle piece installed in a corner panel of a LNG cargo hold according to an embodiment of the present invention, FIG. 4 is a partial perspective view of a cargo hold corner portion to which the angle piece of FIG. 3 is applied, and FIG. FIG. 6 is a perspective view illustrating an angle piece installed in a corner panel of a liquefied natural gas cargo hold according to another embodiment of the present invention, and FIG. 6 is a partial perspective view of a cargo hold corner portion to which the angle piece of FIG. 5 is applied.

The angle piece 100 of the embodiment illustrated in FIG. 3 is installed to seal with a primary barrier material having elasticity between the gaps of the corner panels 110 constituting the corner portions of the LNG cargo hold. 102 and the stress distribution unit 104 is formed to protrude integrally on the body (102).

The body 102 is manufactured by extrusion so that the stress distribution part 104 is formed in a plate-shaped stainless steel (SUS) material, and is installed on the inner side of the corner panel 110 which is the secondary barrier to constitute the primary barrier. do.

The body 102 is formed in a round shape having the same curvature along the rounded corner panel 110 while having a curvature at the corner portion 120 of the cargo hold.

In addition, the stress dispersing part 104 protrudes in a semicircle shape along the length of the curvature surface of the body 102 to disperse the stress concentration for repeated contraction and expansion force.

In the stress distribution unit 104, as in another embodiment of Figure 5, one or more wrinkles 106 is formed, the wrinkles 106 is formed of bone wrinkles of the "V" or "U" shape do.

In addition, it is preferable that the wrinkle part 106 is formed in a fixed ratio along the curvature of a cross-sectional shape, Furthermore, the some wrinkle part 106 is formed so that it may face from the center orthogonal to the longitudinal direction of the body 102. As shown in FIG.

On the other hand, when explaining the installation and operation of the angle piece is installed on the corner panel of the LNG cargo hold according to the present invention having such a configuration as follows.

As shown in Figures 4 to 6, the corner panel 110, which is positioned at the corner portion where the two flat plate portions meet in the cargo hold, connects the flat plate portions to each other is installed.

The corner panel 110 includes a lower panel 112 and an upper panel 114, and is made of a thermal insulation material for preventing heat inflow of the cargo hold. For example, the corner panel 110 is made of polyurethane foam.

And the corner panel 110 is installed with a curvature on the inner surface of the corner portion 120 that is bent at a right angle or obtuse angle in configuring the corner of the cargo hold.

In addition, a top panel 114 of the upper panel 114 of the corner panel 110 is provided with a suspan panel 116 corresponding to the primary barrier and connected to a corrugated membrane (not shown) constituting the primary barrier of the cargo hold plate. .

On the other hand, a gap is generated between the upper panel 114 extending in the longitudinal direction from the corner panel 110, the body 102 of the angle piece 100 of the present invention to seal the gap with elasticity Both ends are attached to the suspan panel 116 by welding to perform the entire sealing function of the cargo hold together with the primary barrier of the flat plate.

That is, the body 102 is installed by welding along the curvature between the upper panel 114.

Therefore, the angle piece 100 can be easily welded to the gap between the corner panel 110 through the round-shaped body 102 having a curvature, thereby increasing the workability, and sealing the entire cargo hold such as the primary barrier of the flat plate. The function is completed, and the stress concentrations 104 that are corrugated between the thick corner panels 110 may reduce stress concentrations that may occur in the angle piece 100 when the hull is deformed.

According to a preferred embodiment of the present invention as described above, forming the overall round shape so as to have the same curvature as the corner panel shape of the cargo hold, by forming a stress dispersion protruding in a semicircle shape in the center to achieve stress dispersion, hull (hull) It is possible to prevent stress concentration at the corners of the LNG cargo hold due to deformation and thermal deformation of the and to improve weldability.

As described above, specific embodiments have been described in the detailed description of the present invention, but it is obvious that the technology of the present invention can be easily modified by those skilled in the art, and such modified embodiments are defined in the claims of the present invention. It will be included in the technical idea described.

1 is a cross-sectional view showing the cargo hold insulation structure of the LNG carrier according to the prior art,

2 is a perspective view showing an angle piece installed in the corner portion of the LNG carrier cargo hold according to the prior art,

3 is a perspective view showing an angle piece installed in the corner panel of the LNG cargo hold according to an embodiment of the present invention,

4 is a partial perspective view of a cargo hold corner portion to which the angle piece of FIG. 3 is applied;

5 is a perspective view illustrating an angle piece installed in a corner panel of a LNG cargo hold according to another embodiment of the present invention;

6 is a partial perspective view of the cargo hold corner portion to which the angle piece of FIG. 5 is applied.

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

100: angle piece 102: body

104: stress distribution portion 106: wrinkle portion

110: corner panel 112: lower panel

114: upper panel 116: suspan panel

120: corner

Claims (6)

In the angle piece installed on the corner panel of the LNG cargo hold, Round body having the same curvature along the rounded inner surface of the corner panel, A stress distribution part protruding in a semicircle shape along the length of the curvature surface of the body to disperse stress concentration Angle piece is installed on the corner panel of the LNG cargo hold including a. The method of claim 1, The angle piece is an angle piece installed on the corner panel of the LNG cargo hold, characterized in that the extrusion is made of stainless steel (SUS) material. The method of claim 1, The angle piece is installed on the corner panel of the LNG cargo hold, characterized in that the primary barrier. The method of claim 1, In the stress distribution unit, Angle piece is installed on the corner panel of the LNG cargo hold, characterized in that at least one wrinkle portion is formed. The method of claim 4, wherein The wrinkle portion of the stress distribution unit, the angle piece is installed on the corner panel of the LNG cargo hold, characterized in that the "V" or "U" shaped bone wrinkles. The method of claim 4, wherein The wrinkle portion of the stress distribution portion, Angle piece is installed on the corner panel of the LNG cargo hold, characterized in that the cross-sectional shape is formed at a predetermined ratio along the curvature.

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