WO2015194788A1

WO2015194788A1 - Support structure for liquid cargo storage tank

Info

Publication number: WO2015194788A1
Application number: PCT/KR2015/005847
Authority: WO
Inventors: 김을년
Original assignee: 현대중공업 주식회사
Priority date: 2014-06-18
Filing date: 2015-06-10
Publication date: 2015-12-23
Also published as: KR20150145069A

Abstract

A support structure for a liquid cargo storage tank according to one embodiment of the present invention comprises: connection parts which are arranged on the hull and form a pair at a position facing each other on the hull; and mooring parts which are connected to the connection parts and are in contact with and support the circumferential surface of a liquid cargo storage tank.

Description

Liquid Cargo Storage Tank Support Structure

The present invention relates to a liquid cargo storage tank support structure.

As liquefied gas emerges as an energy resource, the gas is transported in large quantities from the production base to the demand site for use as energy, and a liquefied gas carrier is used for this purpose. Here, for example, the liquefied gas is in the state of sub-zero cryogenic temperature so as to reduce the volume of the liquefied gas in order to increase the transport amount of the liquefied gas.

That is, the methane contained in the liquefied gas is stored in a liquid state by lowering the temperature below -162 ° C under 1 atm, and the volume of the liquefied methane is about 1/600 of the volume of the gaseous methane in the standard state, and the specific gravity Is 0.42, which is about one half of the crude oil share.

The liquefied gas carrier that carries the liquefied gas includes a liquid cargo storage tank (independent tanker) inside the hull as a cargo hold capable of storing and storing the liquefied gas. The liquid cargo storage tank forms an insulated structure, reducing the transfer of the temperature of the liquefied gas to the hull.

The storage tank installed in the liquefied gas carrier includes a moss-type liquefied gas tank type having a spherical shape and an SPB liquefied gas tank type having a polygonal shape. In order to store the cryogenic liquefied gas, the liquefied gas tank is mainly made of aluminum, and an insulation is installed on the outer wall to prevent heat loss.

When the liquid cargo storage tank is provided on the hull, a skirt provided on the hull generally forms a shape surrounding the liquid cargo storage tank, thereby forming a structure in which the liquid cargo storage tank is supported by the skirt.

Here, when the liquid cargo is filled in the liquid cargo storage tank to store the cryogenic liquid cargo, both the weight of the liquid cargo storage tank and the weight of the liquid cargo are transmitted to the hull through the skirt, wherein the equator portion of the liquid cargo storage tank and Structural discontinuities, such as the hull skirt installation part, are locally heavily loaded and the probability of structural failure is greatly increased.

This occurs because all loads are transmitted through the skirt. In the case of the equator part of the liquid cargo storage tank, the tank expands in the height direction by the load and contracts in the width direction, causing not only buckling but also high stress increase. . In addition, in order to withstand excessive loads, not only a skirt but also a lot of reinforcement is required, which increases the overall load of the hull and may cause a complicated structure.

The present invention has been made to improve the prior art, an object of the present invention is to distribute the load of the liquid cargo storage tank and the liquid cargo is made of a stable support structure, and to prevent excessive load is generated at a specific point It is to provide a liquid cargo storage tank support structure that can omit the reinforcement structure by the load.

Liquid storage tank support structure according to an embodiment of the present invention, provided on the hull, the connection portion paired in a position facing each other the hull; And connected to the connecting portion, characterized in that it comprises a mooring portion in contact with the circumferential surface of the liquid storage tank.

Specifically, the mooring part, one end is provided in any one of the paired connecting portion, the other end is provided in the other one of the paired connecting portion, characterized in that the abutment to the peripheral surface of the liquid storage tank. .

Specifically, the connection portion is provided in a pair or more, characterized in that the mooring portion supports the lower portion of the liquid cargo storage tank at multiple points.

Specifically, the mooring portion is characterized in that abutting and supporting from one side of the equator of the liquid cargo storage tank to the other side of the equator of the liquid cargo storage tank along the lower periphery of the liquid cargo storage tank.

Specifically, the mooring portion, the lower support member surrounding the lower portion of the liquid cargo storage tank; And an upper support member surrounding the upper portion of the liquid cargo storage tank.

Specifically, the lower support member supports at least 30% or less of the height of the entire height of the liquid cargo storage tank, and the mooring portion is at least 5% to 50% of the height of the entire height of the liquid cargo storage tank. And a reinforcement support member adjacent to and supporting the liquid cargo storage tank.

In the liquid cargo storage tank support structure according to the present invention, the lower portion of the liquid cargo storage tank in a net form at a plurality of points, the load of the liquid cargo storage tank and the liquid cargo is dispersed, the support structure is made stable, the specific point Excessive load is prevented from occurring, and the reinforcement structure by the load can be omitted.

1 is a front sectional view of a spherical or elongated liquid cargo storage tank support structure according to a first embodiment of the present invention.

2 is a side cross-sectional view of a spherical or elongated liquid cargo storage tank support structure according to a first embodiment of the present invention.

3 is a view showing a cylindrical or oval cylindrical liquid cargo storage tank support structure according to a second embodiment of the present invention.

4 is a front sectional view of the liquid cargo storage tank support structure according to the third embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, in describing the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a sectional front view of a spherical or elongated liquid cargo storage tank support structure according to a first embodiment of the present invention, and FIG. 2 is a spherical or elongated liquid cargo storage tank support structure according to a first embodiment of the present invention. Figure 3 is a side cross-sectional view, Figure 3 is a view showing a cylindrical or oval cylindrical liquid cargo storage tank support structure according to a second embodiment of the present invention.

First, as shown in Figures 1 and 2, the liquid cargo storage tank support structure 100 according to an embodiment of the present invention includes a connection portion 110 and the mooring portion 120.

The liquid cargo storage tank 20 supported by the liquid cargo storage tank support structure 100 of the present embodiment is a tank for storing liquid cargo, and at least one surface thereof may form a curved surface, and the liquid cargo storage tank 20 is vertical. The cross section may be circular or elliptical. For example, the liquid cargo storage tank 20 may be formed in a spherical shape of the Moss (liquefied gas tank) type.

The liquid cargo stored in the liquid cargo storage tank 20 may be a liquefied gas, the liquefied gas is a cryogenic liquid state, the volume is reduced compared to the gas state can increase the storage capacity. The liquid cargo storage tank 20 may form a heat insulating structure to reduce the transfer of temperature from the cryogenic liquid liquefied gas to the hull 10 and may be made of aluminum to withstand cryogenic temperatures.

The liquid cargo storage tank 20 may be provided with a pump tower 21 vertically across the interior of the liquid cargo storage tank 20 to discharge the liquid cargo. In addition, the liquid cargo storage tank 20 forms a free idle joint with the hull 10 and is connected to the hull 10 near the equator, which is the center of the liquid cargo storage tank 20. ) May be installed and supported on the hull 10. The liquid cargo storage tank 20 may be provided in plural (shown in FIG. 2) in the longitudinal direction of the hull 10.

In addition, a drip tray 140 may be provided on the bottom surface of the hull 10, which is a lower portion of the liquid cargo storage tank 20, so that water droplets generated from the liquid cargo storage tank 20 may be dropped and collected. In addition, a cover 130 may be provided at an upper portion of the liquid cargo storage tank 20, and the cover 130 may prevent seawater from entering the liquid cargo storage tank 20 or the liquid cargo storage tank 20. You can also insulate the.

The connection part 110 is a medium for connecting the mooring part 120 to the hull 10 so that the mooring part 120 can support the liquid cargo storage tank 20. Since the connection part 110 of the present embodiment does not need to be in direct contact with the liquid cargo storage tank 20, the connection part 110 may be made of various metal materials, such as iron, which is easy to withstand load without being limited to a material for enduring the cryogenic temperature of the liquid cargo. .

The connection part 110 is provided in the hull 10 and, for example, can be connected to the inner side (side wall) or the main deck (not shown) of the hull 10 in the vicinity of the liquid cargo storage tank 20. Can be. Here, the hull 10 is composed of a plurality of layers, each layer is made of a deck, the deck provided at the top of the deck which is each layer may be named as the main deck.

The connecting portion 110 may be paired at positions facing each other inside the hull 10 so that the mooring portion 120 is uniformly supported at both ends of the liquid cargo storage tank 20 in the hull 10. The connecting portion 110 is formed in a pair, a plurality of points for supporting the liquid cargo storage tank 20 is made of a plurality of pairs so that the support is made stable and the load is distributed. For example, the connector 110 may be provided to surround the inner surface of the hull 10 to face the outer surface of the liquid cargo storage tank 20.

The connection part 110 may be formed with a through hole (not shown) so that the mooring part 120 may be penetrated and fixed, and the mooring part 120 may be fixedly connected to the through hole. The connecting part 110 may be formed in various forms in which a through hole is formed, such as a plate or a polyhedron, and is not limited thereto, and may be connected and fixed to the hull 10 by welding or the like.

The mooring unit 120 is provided in the connecting portion 110, one end is provided in any one of the paired connecting portion 110, the other end is provided in the other of the paired connecting portion 110, the liquid cargo storage tank ( 20) in contact with the peripheral surface of the support.

The mooring unit 120 may contact and support from one side of the equator, which is the center of the liquid cargo storage tank 20, to the other side of the equator of the liquid cargo storage tank 20 along the lower circumference of the liquid cargo storage tank 20. .

Mooring unit 120 is formed in the form of a rope or net, a plurality of ropes are provided in a plurality of one connection portion 110 is connected to the mooring unit 120 is a plurality of ropes are spaced apart from each other in a single direction A fixed or fixed in a net shape across each other, or a mooring portion 120 made of a net may be provided over the connecting portion 110 inside the hull. The spacing of the ropes or the space between the nets may be designed in consideration of the shape and weight of the liquid cargo storage tank 20. As such, the liquid cargo storage tank 20, which is hoisted by a crane or the like, may be transported and disposed on the mooring part 120 provided in the form spanning the hull 10. The mooring unit 120 allows the static load due to the weight of the liquid cargo storage tank 20 and the dynamic load due to the movement of the hull 10 to be transmitted to the hull 10.

The mooring portion 120 may be formed of a rope made of glass fiber reinforced GRP or carbon fiber reinforced CFRP. This is because when the (cold) low temperature heat of the liquid cargo storage tank 20 storing the cryogenic liquid cargo (LNG: -163 degrees, ethane: -92 degrees) is transferred to the hull 10, the steel plate is brittle due to low temperature. Breakage occurs. In order to prevent this, the present embodiment is a material having almost no thermal conductivity (GRP, CFRP) so that the (extreme) low temperature heat shielding is performed for the mooring part 120 installed between the hull 10 and the liquid cargo storage tank 20. And composite materials). In addition, it is possible to achieve strength maintenance and cost reduction by using a high tensile strength steel as the core of the mooring section 120.

In the present embodiment, the liquid cargo storage tank 20 has been described as a Moss-type liquefied gas tank type, in contrast, the liquid cargo storage tank may be formed in a polygonal or cylinder (cylindrical) type, where the liquid cargo The lower surface of the storage tank is curved to form a round, thereby preventing the load by the mooring portion 120 to be concentrated on a portion of the liquid cargo storage tank.

3, the mooring portion 120A is fixed to both ends of the hull 10A so that the liquid cargo storage tank support structure 100A corresponds to the curve of the liquid cargo storage tank (not shown). It can be formed to form a semi-cylindrical shape. In the drawing, a portion of the hull 10A is shown, and the connecting portion 110 is omitted from the front and rear, but the connecting portion 110 is provided on the inside and back of the hull 10A so as to surround the lower part of the front and rear as well as the left and right sides of the liquid storage tank. The connection part 120A may be connected.

As described above, the liquid cargo storage tank support structure 100A according to the present embodiment has a different shape of the liquid cargo storage tank in the liquid cargo storage tank support structure 100 of the first embodiment, so that the mooring portion 120A is disposed. And the inner shape of the hull (10A) is made of a different function and action is the same or similar to each other and overlapping description will be omitted.

In addition, although not shown in the figure, in order to prevent the rope, which is the mooring portion 120, from the predetermined position of the liquid cargo storage tank 20, the liquid cargo storage tank 20 is a liquid-type or H-shaped reinforcement to the liquid cargo It may be installed on the bottom surface of the hull 10 so as to abut on the storage tank 20 so that the mooring portion 120 in the reinforcement does not deviate from the position.

Thus, the present embodiment, the lower portion of the liquid cargo storage tank 20 in a net form at a plurality of points, the load of the liquid cargo storage tank 20 and the liquid cargo is dispersed, the support structure is made stable, Excessive load at the point can be prevented and the reinforcement structure by the load can be omitted.

4 is a front sectional view of the liquid cargo storage tank support structure according to the third embodiment of the present invention. Components that are the same as or correspond to the above-described exemplary embodiments are denoted by the same reference numerals, and redundant description thereof will be omitted.

A liquid storage tank support structure 200 will be described with reference to FIG. 4. In the present embodiment, only the positions of the connecting parts 210 and the mooring parts 220 are different from those of the first and second embodiments.

The connection part 210 of the present embodiment is different from the connection part 110 of the first and second embodiments provided adjacent to the main deck, and a virtual form of the deck formed directly below the main deck among a plurality of decks formed below the main deck. Can be provided on the horizontal line. Accordingly, the mooring portion 220 does not interfere along the circumference of the equator, which is the center of the liquid cargo storage tank 20, so that a separate heat insulator or the like may be installed at the equator of the liquid cargo storage tank 20. In addition, since the position of the connection portion 210 is moved downward, the length of the mooring portion 220 surrounding the liquid cargo storage tank is reduced, the moment can be reduced.

The mooring part 220 of the present embodiment may include a lower support member 222, a reinforcement support member 221, and an upper support member 223. The mooring part 220 may be formed of a rope made of glass fiber reinforced GRP or carbon fiber reinforced CFRP, which is similar in function to the mooring part 120 of the first embodiment.

The lower support member 222 may have a lower portion to receive a main load of the liquid cargo storage tank 20. The lower support member 222 may support a height of at least 30% or less of the entire height of the liquid cargo storage tank 20, and may be connected to the inner circumferential surface of the hull 10, but not illustrated in the drawing. It can be fixed in various forms, such as the connection portion is provided or integrally formed in the partition of the hull (10).

The lower support member 222 is formed in the form of a rope or a net, and a plurality of ropes are provided in a plurality of ropes so that one lower support member 222 is connected to a pair of connection portions 210 so that a plurality of ropes are separated from each other. Is fixed in a single direction or fixed in a net shape across each other, the lower support member 222 made of a net may be provided over the connecting portion 210 in the inner side of the hull (10).

In addition, when the lower support member 222 is fixed to the hull 10, each of both ends of the lower support member 222 may be divided into a plurality, and a point connected to the hull 10 may be a plurality of points. Accordingly, the load of the liquid cargo storage tank 20 can be dispersed and stably supported.

The reinforcement support member 221 is configured to hold along the left and right circumference of the liquid cargo storage tank 20 to prevent movement of the liquid cargo storage tank 20 by the movement of the hull 10, the liquid cargo storage tank 20 The liquid cargo storage tank 20 may be supported adjacent to a height of at least 5% to 50% of the total height of the bottom.

For example, the reinforcing support member 221 has one end connected to the connecting portion 210 and the other end connected to the hull 10 (separate connecting portion may be connected to the bottom surface of the hull), the liquid cargo storage tank It can abut against and support the lower side of 20. Such, the reinforcing support member 221 is formed of a plurality of rope, a plurality of reinforcing support members 221 are arranged in a line along the circumference of the liquid cargo storage tank 20, the transverse movement of the liquid cargo storage tank 20 Can be prevented.

The upper support member 223 is configured to prevent the liquid cargo storage tank 20 from being separated, and may have an upper portion of the liquid cargo storage tank 20.

For example, one end of the upper support member 223 is provided at any one of the paired connecting portions 210, and the other end of the upper support member 223 is provided at the other one of the paired connecting portions 210. Support against the upper circumferential surface. The upper support member 223 may be formed in the form of a rope or net similarly or similarly to the lower support member 222.

For example, in order to prevent the movement of the liquid cargo storage tank 20 due to the movement of the hull 10, the seawater due to the movement of the liquid cargo storage tank 20 due to the vertical movement of the hull 10 and sea accidents In order to prevent the liquid cargo storage tank 20 from floating in the hull 10 by immersion into the (10) to prevent the movement of the liquid cargo storage tank 20 in the vertical direction. This is equally applicable to the first and second embodiments.

As described above, in the present embodiment, the lower support member 222 and the reinforcement support member 221 of the mooring part 220 may move the liquid cargo storage tank 20 due to the horizontal motion of the hull 10. The upper support member 223 is stably supported by preventing the liquid storage tank 20 from being separated while preventing side movement and front and rear movement.

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto, and should be understood by those skilled in the art within the technical spirit of the present invention. It is obvious that the modifications and improvements are possible.

All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.

Claims

A connection portion provided in the hull and paired with the hull in a position facing each other; And

And a mooring portion connected to the connection portion for supporting the circumferential surface of the liquid cargo storage tank.
The method of claim 1, wherein the mooring unit,

One end is provided in any one of the paired connection portion, the other end is provided in the other one of the paired connection portion, the liquid cargo storage tank support structure, characterized in that abuts on the peripheral surface of the liquid cargo storage tank.
The method of claim 1,

The connection portion is provided in one or more pairs,

And the mooring part supports a lower portion of the liquid cargo storage tank at multiple points.
The method of claim 1, wherein the mooring unit,

And support from one side of the equator of the liquid cargo storage tank to the other side of the equator of the liquid cargo storage tank along a lower circumference of the liquid cargo storage tank.
The method of claim 1, wherein the mooring unit,

A lower support member surrounding the lower portion of the liquid cargo storage tank; And

And an upper support member covering the upper portion of the liquid cargo storage tank.
The method of claim 5,

The lower support member supports at least 30% or less of the height of the entire height of the liquid cargo storage tank,

The mooring portion, the liquid cargo storage tank support structure further comprises a reinforcement support member for supporting the liquid cargo storage tank adjacent to a height of at least 5% to 50% of the entire height of the liquid cargo storage tank. .