KR20150145069A

KR20150145069A - Support structure for tank

Info

Publication number: KR20150145069A
Application number: KR1020140074382A
Authority: KR
Inventors: 김을년
Original assignee: 현대중공업 주식회사
Priority date: 2014-06-18
Filing date: 2014-06-18
Publication date: 2015-12-29
Also published as: WO2015194788A1

Abstract

According to an aspect of the present invention, there is provided a structure for supporting a liquid cargo storage tank, comprising: a coupling unit provided on a hull and paired at a position facing the hull; And a mooring portion connected to the connection portion and supported by the peripheral surface of the liquid storage tank.
The liquid storage tank supporting structure according to the present invention is characterized in that a lower portion of the liquid storage tank is surrounded by a net at a plurality of points and the load of the liquid storage tank and the liquid cargo is dispersed, It is possible to prevent the load from being excessively generated and to omit the reinforcing structure by the load.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a support structure for a liquid storage tank,

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

As liquefied gas emerges as an energy source, it is transported in large quantities from the production base to the demand site in order to use this gas as energy. To this end, a liquefied gas carrier is used. Here, for example, the liquefied gas has a cryogenic temperature of minus so as to reduce the volume of the liquefied gas in order to increase the volume of the liquefied gas.

That is, the methane contained in the liquefied gas is kept at a temperature of -162 ° C or lower under 1 atmospheric pressure and stored in a liquid state. The volume of liquefied methane is about one sixth of the volume of the gaseous methane in a standard state, Is 0.42, which is about one half of the specific gravity of crude oil.

This liquefied gas carrier carrying 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. Liquid cargo storage tanks constitute an insulated structure, which reduces 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-type liquefied gas tank type having a polygonal shape. In order to store cryogenic liquefied gas, the liquefied gas tank is mainly made of aluminum, and insulation is installed on its outer wall to prevent heat loss.

When the liquid storage tank is provided on the hull, the skirt provided on the hull generally covers the liquid storage tank, and the liquid storage tank is supported by the skirt.

Here, when the liquid cargo storage tank is filled with the liquid cargo 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. At this time, A large local load is applied to the structure discontinuity portion such as the skirt attachment portion of the hull, and the probability of structural failure greatly increases.

This is because all the loads are transferred through the skirt. In the equatorial portion of the liquid cargo storage tank, the tank is stretched in the height direction due to the load, and the shrinkage in the width direction causes not only buckling but also high stress increase . In addition, in order to withstand excessive load, a lot of reinforcement is required not only for the skirt but also for the hull, thereby increasing the overall load of the hull and complicating the structure.

SUMMARY OF THE INVENTION The present invention has been made in order to overcome the problems of the prior art, and it is an object of the present invention to provide a liquid storage tank, And it is an object of the present invention to provide a liquid storage tank support structure which can omit a reinforcing structure by a load.

According to an aspect of the present invention, there is provided a structure for supporting a liquid cargo storage tank, comprising: a coupling unit provided on a hull and paired at a position facing the hull; And a mooring portion connected to the connection portion and supported by the peripheral surface of the liquid storage tank.

Specifically, the mooring unit is characterized in that one end is provided at one of the pair of connecting portions, and the other end of the pair of connecting portions is provided so as to abut against the circumferential surface of the liquid storage tank .

Specifically, the connection portions are provided in more than one pair, and the mooring portion supports the lower portion of the liquid cargo storage tank at multiple points.

Specifically, the mooring part is supported by one side of the equatorial portion of the liquid-storage tank, and the other side of the equatorial portion of the liquid-storage tank along the lower periphery of the liquid-storage tank.

Specifically, the mooring unit may include: a lower supporting member for covering a lower portion of the liquid storage tank; And an upper support member covering the upper portion of the liquid cargo storage tank.

Specifically, the lower support member supports at least the lower 30% height of the total height of the liquid cargo storage tank, and the mooring portion has a height of at least 5% to 50% of the total height of the liquid cargo storage tank And a reinforcing support member for supporting the liquid storage tank adjacent to the liquid storage tank.

The liquid storage tank supporting structure according to the present invention is characterized in that a lower portion of the liquid storage tank is surrounded by a net at a plurality of points and the load of the liquid storage tank and the liquid cargo is dispersed, It is possible to prevent the load from being excessively generated and to omit the reinforcing structure by the load.

1 is a front cross-sectional view of a spherical or elongated spherical liquid storage tank support structure according to a first embodiment of the present invention.
2 is a side cross-sectional view of a spherical or extended spherical liquid cargo storage tank support structure according to a first embodiment of the present invention.
FIG. 3 is a view showing a structure for supporting a cylindrical or trough-shaped liquid cargo storage tank according to a second embodiment of the present invention.
4 is a front sectional view of a structure for supporting a liquid cargo storage tank according to a third embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The objects, particular advantages and novel features of the present invention will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. It should be noted that, in the present specification, the reference numerals are added to the constituent elements of the drawings, and the same constituent elements are assigned the same number as much as possible even if they are displayed on different drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

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

FIG. 1 is a front sectional view of a spherical or elongated spherical liquid storage tank supporting structure according to a first embodiment of the present invention, FIG. 2 is a sectional view of a spherical or spherical liquid storage tank supporting structure according to a first embodiment of the present invention, And FIG. 3 is a view showing a supporting structure of a cylindrical or other cylindrical liquid storage tank according to a second embodiment of the present invention.

1 and 2, the liquid storage tank supporting structure 100 according to an exemplary embodiment of the present invention includes a connecting portion 110 and a mooring portion 120. As shown in FIG.

The liquid storage tank 20 supported by the liquid storage tank support structure 100 of the present embodiment is a tank for storing liquid cargo, and at least one surface may be curved, The cross section may be circular or elliptical. For example, the liquid storage tank 20 may be of a moss-type liquefied gas tank type and may be spherical.

The liquid cargo stored in the liquid cargo storage tank 20 may be a liquefied gas, and the liquefied gas may be in a liquid state at a cryogenic temperature, so that the storage capacity can be increased by reducing the volume as compared with the gas state. The liquid cargo storage tank 20 may be made of an aluminum material to form a heat insulating structure and to withstand cryogenic temperatures so as to reduce the transfer of the temperature from the cryogenic liquefied gas to the ship 10.

The liquid cargo storage tank 20 may be provided with a pump tower 21 vertically across the inside of the liquid cargo storage tank 20 to discharge the liquid cargo. The liquid storage tank 20 is in a free idle joint with the hull 10 and is connected to the hull 10 by a connecting portion 110 Can be installed and supported on the hull 10. The liquid cargo storage tank 20 may be provided in a plurality of (two shown in FIG. 2) in the longitudinal direction of the ship 10.

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

The connecting 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 portion 110 of the present embodiment does not need to be in direct contact with the liquid cargo storage tank 20, it can be made of various metal materials such as iron, which is easy to withstand load, .

The connection part 110 is provided on the hull 10 and is connected to the inner side (sidewall) of the hull 10 near the liquid storage tank 20 or a main deck (not shown) . Here, the hull 10 is made up of a plurality of layers, each of which is made up of a deck, and a deck provided at the top of the decks, which is each layer, can be called a main deck.

The connecting portion 110 may be paired at the positions facing each other inside the hull 10 so that the mooring portions 120 are uniformly supported at both ends of the liquid cargo storage tank 20 in the hull 10. The connection portions 110 may be formed as a pair, and the connection portions 110 may be formed of a plurality of pairs so that a plurality of points for supporting the liquid cargo storage tank 20 are stably supported and the load is dispersed. For example, the connection portion 110 may be provided to surround the inner surface of the hull 10 so as 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 is penetrated and fixed, and the mooring part 120 may be fixedly connected to the through hole. The connection part 110 may be formed in various shapes such as a plate shape or a polygonal shape and a through hole. The connection part 110 is not limited to the shape and may be connected to the hull 10 by welding or the like.

The mooring part 120 is provided in the connection part 110 and has one end in one of the pair of connection parts 110 and the other end in the other of the pair of the connection part 110, 20).

The mooring part 120 can be held in contact with the other side of the equator of the liquid cargo storage tank 20 along the lower side of the liquid cargo storage tank 20 from one side of the equatorial part which is the center of the liquid cargo storage tank 20 .

The mooring part 120 is formed in the form of a sling or a net, and a plurality of slinging ropes are provided, and one mooring part 120 is connected to the pair of connecting parts 110 so that the plurality of slinging parts are spaced apart from each other A mooring part 120 made of a net may be provided on the inner side of the hull and over the connecting part 110. [ The spacing of the sling or the space between the nets can be designed in consideration of the shape and the weight of the liquid cargo storage tank 20. [ As described above, the liquid storage tank 20, which is lifted by a crane or the like, can be carried and arranged and supported on the mooring part 120 provided on the ship 10. The mooring part 120 allows the static load due to the self weight of the liquid cargo storage tank 20 and the dynamic load due to the motion of the ship 10 to be transmitted to the ship 10.

The mooring part 120 may be formed of a rope made of GRP reinforced with glass fiber or CFRP reinforced with carbon fiber. This is because when the (hot) heat of the liquid storage tank 20 storing the cryogenic liquid cargo (LNG: -163 degrees, -92 degrees in ethane) is transferred to the ship 10, Breakage occurs. In order to prevent this, the present embodiment is provided with a material (GRP, CFRP) having little thermal conductivity so that the (pole) low-temperature heat shielding for the mooring part 120 installed between the hull 10 and the liquid- And the like). Further, high strength steel can be used as a core material of the end face of the mooring part 120 to maintain the strength and reduce the cost.

In this embodiment, the liquid cargo storage tank 20 is described as a moss-type liquefied gas tank type. Alternatively, the liquid cargo storage tank may be a polygonal shape or cylinder (cylindrical) shape, The lower surface of the storage tank is curved to form a round shape, thereby preventing the load caused by the mooring portion 120 from concentrating on a portion of the liquid storage tank.

This is because the mooring portion 120A is fixed to both ends of the ship 10A so that the liquid storage tank support structure 100A corresponds to the curve of the liquid cargo storage tank (not shown) It may be formed into a semi-cylindrical shape. Although the connecting part 110 is omitted in the front and rear parts of the hull 10A in the figure, the connecting part 110 is provided on the inner front and rear of the hull 10A so as to cover the left and right sides as well as the front and rear sides of the liquid storage tank The connection portion 120A can be connected.

As described above, the liquid storage tank supporting structure 100A according to the present embodiment differs from the liquid storage tank supporting structure 100 of the first embodiment in that the shape of the liquid storage tank is different from that of the first embodiment, And the inner shape of the hull 10A are different from each other, and functions and operations are the same or similar to each other, and redundant explanations are omitted.

In addition, although not shown in the drawings, in order to prevent the rope from escaping from the mooring part 120 at a predetermined position of the liquid cargo storage tank 20, a ∪ type or H type stiffener is stored in the liquid cargo storage tank 20, It is possible to prevent the mooring part 120 from being displaced from the predetermined position by providing the reinforcing material on the bottom surface of the hull 10 so as to abut the tank 20.

As described above, in the present embodiment, the lower part of the liquid cargo storage tank 20 is surrounded by a net at a plurality of points, the load of the liquid cargo storage tank 20 and the liquid cargo is dispersed, It is possible to prevent the load from being excessively generated at the point, and the reinforcing structure by the load can be omitted.

4 is a front sectional view of a structure for supporting a liquid cargo storage tank according to a third embodiment of the present invention. The same or corresponding elements as those of the above-described embodiment will be denoted by the same reference numerals and duplicate descriptions thereof will be omitted.

The liquid storage tank support structure 200 will be described with reference to FIG. The present embodiment is different from the first and second embodiments only in the position of the connection part 210 and the mooring part 220.

The connecting portion 210 of the present embodiment is different from the connecting portion 110 of the first and second embodiments in that the connecting portion 110 is provided adjacent to the main deck, As shown in FIG. Accordingly, the mooring part 220 is not interfered along the periphery of the equatorial portion, which is the center part of the liquid cargo storage tank 20, so that a separate heat insulating material or the like can be installed in the equator of the liquid cargo storage tank 20. Further, since the connecting portion 210 moves downward, the length of the mooring portion 220 covering the liquid cargo storage tank is reduced, and the moment can be reduced.

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

The lower support member 222 can be lowered to receive the main load of the liquid cargo storage tank 20. [ The lower support member 222 can support at least the lower 30% of the height of the entire height of the liquid cargo storage tank 20 and can be connected to the inner circumferential surface of the hull 10, Or may be integrally formed on the partition wall of the hull 10, or may be fixed in various forms.

The lower support member 222 is in the form of a sling or a net so that a plurality of sling ropes are provided and a lower support member 222 is connected to the pair of connection portions 210, A lower supporting member 222 made of a net may be provided on the inner side of the hull 10 and across the connecting portion 210. [

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

The reinforcing support member 221 is configured to hold the liquid storage tank 20 along the left and right sides to prevent movement of the liquid storage tank 20 due to the motion of the ship 10. The liquid storage tank 20 ) Adjacent the height of at least the lower 5% to 50% of the total height of the liquid storage tank 20.

For example, one end of the reinforcing supporting member 221 is connected to the connecting portion 210 and the other end is connected to the hull 10 (a separate connecting portion can be formed and connected to the bottom surface of the hull) (20). A plurality of reinforcing support members 221 are provided in a row along the periphery of the liquid cargo storage tank 20 so that the liquid cargo storage tank 20 is moved in the lateral direction Can be prevented.

The upper support member 223 is configured to prevent the liquid cargo storage tank 20 from being dislodged, and may be disposed above the liquid cargo storage tank 20.

For example, the upper support member 223 is provided at one end of one of the pair of connection portions 210 and at the other end of the other of the pair of connection portions 210, And is held in contact with the upper circumferential surface. The upper support member 223 may be of the same or similar shape as the lower support member 222 in the form of a rope or net.

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

The lower supporting member 222 and the reinforcing supporting member 221 of the mooring unit 220 can move the liquid storage tank 20 due to the left / The upper support member 223 prevents the liquid cargo storage tank 20 from separating and stably supports the liquid storage tank 20 while preventing lateral movement and forward and backward movement.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification and the modification are possible.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10, 10A: Hull 20: Liquid storage tank
21: pump tower 100, 100A, 200: supporting structure of liquid cargo storage tank
110, 210: connection part 120, 120A, 220: mooring part
130: Cover 140: Drip tray
221: reinforcing supporting member 222: lower supporting member
223: upper support member

Claims

A pair of connecting portions provided on the hull, the pair of hulls facing each other; And
And a mooring portion connected to the connection portion, wherein the mooring portion abuts against the circumferential surface of the liquid storage tank.

The water treatment system according to claim 1,
Wherein one end of each of the pair of connecting portions is provided and the other end of the pair of connecting portions is provided to abut against a peripheral surface of the liquid storage tank.

The method according to claim 1,
Wherein the connection portions are provided in at least one pair,
Wherein the mooring portion supports the lower portion of the liquid storage tank at multiple points.

The water treatment system according to claim 1,
Wherein the liquid storage tank is supported on one side of the equatorial portion of the liquid storage tank along the lower periphery of the liquid storage tank to the other side of the equatorial portion of the liquid storage tank.

The water treatment system according to claim 1,
A lower support member covering a lower portion of the liquid storage tank; And
And an upper support member covering an upper portion of the liquid storage tank.

6. The method of claim 5,
Wherein the lower support member supports at least the lower 30% of the height of the liquid storage tank,
Characterized in that the mooring unit further comprises a reinforcing support member for supporting the liquid cargo storage tank adjacent to a height of at least 5% to 50% of the total height of the liquid cargo storage tank .