KR101903103B1 - Offshore structure having cargo oil storage tank with hinge type block wall and damaged space reducing method - Google Patents

Abstract

A marine structure having a cargo oil storage tank provided with a hinge-type partition wall and a damaging space reducing method are disclosed. An offshore structure according to an embodiment of the present invention is an offshore structure having a plurality of cargo oil storage tanks divided into a plurality of partition walls in the hull and a plurality of laterally adjacent ballast tanks therein, Wherein each of the hinge-type partition walls includes a hinge shaft vertically installed at a center portion of the inner space; And a first rotating wall member and a second rotating wall member which rotate individually with the hinge shaft as a rotation axis.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine structure having a cargo oil storage tank having a hinge type partition wall,

The present invention relates to a marine structure having a cargo oil storage tank provided with a hinge-type partition wall, and a method for reducing damage.

Floating production, storage and offloading (FPSO), which is a typical floating oil production unit, has many process modules (also referred to as a topside) on the hull.

As FPSOs become larger, process module sizes and weights are increasing, and FPSOs are demanding larger hull sizes. Therefore, it is becoming more competitive to hull design to optimize the hull size and, if possible, hull engineering to allow larger process module weights on the same hull size.

Japanese Unexamined Patent Application Publication No. 2014-223819 (published Apr. 12, 2014) - Design method of linear structure and linear structure

The present invention relates to a cargo oil storage system in which a cargo oil storage tank provided in an offshore structure is provided with a hinge-type partition wall for minimizing the inflow of external seawater when it is damaged by collision with other ships, To provide an offshore structure with a tank and a method of reducing damage space.

The present invention relates to a cargo oil storage tank provided with a hinge type partition wall in which a hinge type partition wall is installed in a cargo oil storage tank provided in an offshore structure, And to provide a method for reducing an ocean structure and damage space.

Other objects of the present invention will become readily apparent from the following description.

According to an aspect of the present invention, there is provided an offshore structure having a plurality of cargo oil storage tanks partitioned by a plurality of partition walls in a hull and a plurality of laterally adjacent ballast tanks, wherein each of the plurality of cargo oil storage tanks includes A hinge type partition wall for partitioning an internal space into two spaces, the hinge type partition wall comprising: a hinge shaft vertically installed in a center portion of the internal space; A first swivel body and a second swivel wall that rotate individually with the hinge shaft as a rotation axis.

The first rotating wall and the second rotating wall may have a first shaft engaging portion and a second shaft engaging portion, respectively, which surround the hinge shaft, and the first shaft engaging portion and the second shaft engaging portion are overlapped with each other .

And a first extension wall and a second extension wall extending in the width direction of each of the first rotary wall and the second rotary wall may be installed on the other side of each of the first rotary wall and the second rotary wall.

The first extension wall and the second extension wall each have a width greater than the longest distance from the hinge shaft to the edge between the tank bulkheads when extended from the first swivel wall and the second swivel wall, And the like.

And a controller for individually controlling the rotation of the first rotating wall and the second rotating wall, and the extension of the first extending wall and the second extending wall depending on the damaged position when the offshore structure is damaged .

The first rotating wall and the second rotating wall may have a width smaller than the shortest distance from the hinge shaft to the tank bulkhead.

According to another aspect of the present invention, there is provided a method for reducing the damage space in an offshore structure having a plurality of cargo oil storage tanks partitioned into a plurality of partition walls in a hull and a plurality of laterally neighboring ballast tanks therein, Wherein each of the cargo oil storage tanks of the cargo oil storage tanks is provided with a hinge type partition wall dividing the internal space into two spaces, Identifying two adjacent cargo oil storage tanks as damaged cargo oil storage tanks based on the damage location; And performing rotational and width control on the hinge type partition wall installed in the damaged cargo oil storage tank.

The rotation and width control step rotates the first rotation wall to vertically position the damaged cargo oil storage tank vertically toward the barrier between the same kind of tanks where the first rotation wall meets the neighboring other damage expected cargo oil storage tank, Extending in contact with the partition wall between the same kind tanks; The second rotating wall body is rotated so as to face an edge between the same kind of tank partition wall not meeting the other damage expected cargo oil storage tank and the partition wall between the different kinds of tanks meeting with the laterally adjacent ballast tank, As shown in FIG.

Or the rotation and width control step rotates the first and second rotating wall bodies toward both side edges of the partition wall between the different kinds of tanks in which the first and second rotating wall bodies meet with laterally adjacent ballast tanks with respect to the damaged cargo oil storage tank, 1 and the second extension wall, respectively, so as to contact the both side edges.

Other aspects, features, and advantages will become apparent from the following drawings, claims, and detailed description of the invention.

According to the embodiment of the present invention, when a cargo oil storage tank provided in an offshore structure is damaged by a collision with another ship, it is possible to minimize the inflow of external sea water, thereby satisfying the MARPOL damage restoration force requirement.

In addition, by providing a hinge-type partition wall in a cargo oil storage tank provided in an offshore structure, the damage space is minimized, thereby increasing the weight limit of a process module that can be mounted on the hull.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 shows a FPSO type offshore structure,
FIG. 2 is a view showing the damaged space in the FPSO type offshore structure,
3 is a transverse sectional view of a marine structure having a cargo oil storage tank provided with a hinge type partition wall according to an embodiment of the present invention,
4 is a schematic view of a hinge type partition wall according to an embodiment of the present invention,
5 is a view showing an arrangement of a shaft engaging portion coupled to a hinge shaft,
6 is a flowchart of a method of operating the hinge-type partition wall,
7 is a first exemplary view showing an operation of the hinge-type partition wall in the event of damage,
8 is a second exemplary view showing the operation of the hinge-type partition wall in the event of damage.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof. And the terms first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 1 is a view showing an FPSO type offshore structure, and FIG. 2 is a view showing a damaged area on an FPSO type offshore structure.

Fig. 1 (a) is a side perspective view, Fig. 1 (b) is a sectional view seen from the front, and Fig. 1 (c) is a sectional view taken from above.

1, an FPSO type offshore structure 10 includes a process module 14, a flare tower 16, a living quarters 18 and the like mounted on a hull 12, There are several tanks, including a Cargo Oil Storage Tank 20 for storing oil, a Water Ballast Tank 30 for ballasting, and a Machinery Space 40.

Here, the factor determining the weight limit of the process module 14 is determined by the International Convention for the Prevention of Pollution from Ships (MARPOL) Damage Stability Requirement. According to this, the stability of the offshore structure is interpreted on the assumption that the hull is damaged.

1 (b) or (c), the cargo oil storage tank 20 is relatively large in size as compared with the ballast tank 30.

According to the MARPOL damage restoration force requirement, it is assumed that two neighboring cargo oil storage tanks 20 and their neighboring ballast tanks 30 are all damaged.

Referring to FIG. 2, a damaged space S1 in which seawater is expected to be inflow from the outside when damages occur is shown. The damaged space S1 includes two cargo oil storage tanks T1 and T2 and two ballast tanks B1 and B2.

The larger the damaged space S1, the greater the inflow amount of the external seawater when the damage occurs. Therefore, the weight limit of the process module 14 that can be mounted on the upper portion of the ship 12 is reduced for the stability of the ship 12 .

Therefore, the structure for reducing the size of the damaged space will be described below.

FIG. 3 is a cross-sectional view of a marine structure having a cargo oil storage tank provided with a hinge-type partition wall according to an embodiment of the present invention. FIG. 4 schematically illustrates a hinge-type partition wall according to an embodiment of the present invention. 6 is a flow chart of a method of operating the hinge-type partition wall, and Fig. 7 is a view showing an operation view of the hinge-type partition wall when a damage occurs, and Fig. 5 is a view showing an arrangement of a shaft coupling portion coupled to the hinge shaft. Fig. 8 is a second exemplary view showing the operation of the hinge-type partition wall in the event of damage. Fig.

3 to 8 show the ship 12, the cargo oil storage tanks 20, T1 to T8, the ballast tanks 30, B1 to B8 and the partition walls 100, 100a and 100b A first extension wall 124, a first shaft coupling 122, a second rotation wall 130, a second extension wall 134, and a second extension wall 134. The hinge shaft 110, the first rotary wall 120, the first extension wall 124, Two shaft coupling portions 132, damaged spaces S2 and S3, partition walls 150 of the same tank and partition walls 160a and 160b of different kinds of tanks are shown.

The hinge-type partition wall 100 according to an embodiment of the present invention is installed in a cargo oil storage tank of an offshore structure and the wall rotates according to the damaged position to change the partition line of the inner space of the tank, .

Referring to FIG. 3, it is assumed that eight cargo oil storage tanks T1 to T8 are arranged in two lines in the longitudinal direction on the offshore structure. Eight cargo oil storage tanks (T1 to T8) have eight ballast tanks (B1 to B8) in the lateral direction, respectively. 3 is a partially enlarged view of the cargo oil storage tank T1 and the ballast tank B1.

The hinge-type partition walls 100 according to the present embodiment may be installed one by one for each cargo oil storage tank 20. Here, the hinge type partition wall 100 can be individually controlled (operated, rotated, extended, etc.) for each cargo oil storage tank 20 by a control unit (not shown).

Referring to FIG. 4, the hinge-type partition wall 100 includes a hinge shaft 110, a first rotating wall 120, and a second rotating wall 130 as basic skeletons.

The hinge shaft 110 is vertically installed at the center of one of the cargo oil storage tanks T1 to T8 and serves as a rotating shaft of the first rotating wall body 120 and the second rotating wall body 130.

The first rotating wall body 120 and the second rotating wall body 130 are each a wall rotatably coupled to the hinge shaft 110 at one side thereof. The first rotating wall member 120 and the second rotating wall member 130 may have a height corresponding to a distance between a bottom surface of the inner space of the cargo oil storage tank and the ceiling. That is, the cargo oil storage tanks can be divided into two spaces by the first rotating wall body 120 and the second rotating wall body 130.

A watertight member (not shown) is attached to the upper and lower ends of the first rotating wall body 120 and the second rotating wall body 130 so that the two spaces defined by the hinge type partition wall 100 in the cargo oil storage tank Even if the seawater flows into one of the spaces, it is possible to have a watertightness characteristic that prevents further inflow into another space.

A first shaft coupling portion 122 having a structure that surrounds the hinge shaft 110 is provided at one side of the first rotating wall body 120. For example, the first shaft engaging portion 122 has an inner hollow cylindrical shape, and the hinge shaft 110 can be fitted into the first shaft engaging portion 122. The inner diameter of the first shaft engaging portion 122 can be determined so as to correspond to the outer diameter of the hinge shaft 110.

And a second shaft coupling portion 132 having a structure that surrounds the hinge shaft 110 is provided at one side of the second rotating wall body 130. [ For example, the second shaft engaging portion 132 has an inner hollow cylindrical shape, and the hinge shaft 110 can be fitted into the second shaft engaging portion 132. The inner diameter of the second shaft engaging portion 132 may be determined so as to correspond to the outer diameter of the hinge shaft 110.

At this time, the portions where the first shaft coupling portion 122 and the second shaft coupling portion 132 surround the hinge shaft 110 may be arranged so as not to overlap with each other.

For example, as shown in FIG. 5 (a), the first shaft engaging portion 122a may be located at the upper portion and the second shaft engaging portion 132b may be located at the lower portion. But may be arranged in the reverse order depending on the embodiment.

In another example, as shown in FIG. 5 (b), the first shaft engaging portions 122b1 and 122b2 are separated into two portions at the upper and lower ends, and the second shaft engaging portion 132b is positioned therebetween . But may be arranged in the reverse order depending on the embodiment.

In another example, a portion of the first shaft coupling portions 122c1 and 122c2 and a portion of the second shaft coupling portions 132c1 and 132c2 may be alternately positioned as shown in Fig. 5 (c).

The structure in which the first rotating wall body 120 and the second rotating wall body 130 are rotated about the hinge shaft 110 as a center axis may have a structure similar to that of the revolving door. At this time, the coupling portion between the first and second shaft coupling portions 132 and the hinge shaft 110 may be coupled to allow smooth rotation while maintaining watertightness.

However, in this embodiment, the first rotating wall member 120 and the second rotating wall member 130 are rotatable individually (see arrows A and B in Fig. 4) so that the angle between them can be freely varied.

A first extension wall 124 may be provided on the other side of the first rotating wall body 120. The first extension wall 124 has the same height as the first rotary wall 120 and is provided so as to extend in the width direction of the first rotary wall 120 (see arrow C in FIG. 4).

The second rotating wall body 130 may also have a second extending wall 134 on the other side thereof. The second extending wall 134 has the same height as the second rotating wall 130 and is installed so as to extend in the width direction of the second rotating wall 130 (see arrow D in FIG. 4).

The first rotating wall member 120 and the second rotating wall member 130 have widths W1 and W2 of a length smaller than the shortest distance d0 from the hinge shaft 110 to the tank partition wall 150 or 160a / . Therefore, if the first extension wall 124 and the second extension wall 134 are not extended from the first swivel body 120 and the second swivel body 130, respectively, the tank wall 150 or 160a / The first rotating wall member 120 and the second rotating wall member 130 can smoothly rotate without interference.

The first extension wall 124 and the second extension wall 134 are spaced apart from the hinge shaft 110 when they extend maximum from the first swivel wall 120 and the second swivel wall 130, Or W4 to have a width greater than the longest distance d1 to the edge between the two ends 160a / 160b.

d1? (W1 + W3) or d1? (W2 + W4)

In this case, the first extending wall 124 extending from the first rotating wall body 120 can reach any part of the cargo oil storage tank according to the rotation angle of the first rotating wall body 120, . ≪ / RTI > This also applies to the relationship between the second rotating wall body 130 and the second extending wall body 134.

Hereinafter, with reference to FIG. 6, a description will be made of a process of reducing the damage space when damage occurs to an offshore structure.

When a damage occurs due to a collision of a marine structure or the like on the offshore structure, the control unit recognizes the damaged position (step S200). In this case, the damage location can be detected by using signals detected by various sensors installed on the outer wall of the hull of an offshore structure.

For example, when an image sensor such as a camera is used, it is determined that a damage has occurred when a change occurs in a hull outer wall in a recent image as compared with a normal image, and the position can be detected through image analysis.

Or when an impact sensor is present, if a shock of a predetermined threshold or more such as a ship collision is detected on the outer wall of the hull, the position where the impact is applied can be found. If a plurality of impact sensors are arranged in a grid type, the position of the impact may be detected by analyzing the correlation between the magnitude of the impact amount detected by the plurality of impact sensors and the position of the impact sensor.

The control unit identifies the adjacent cargo oil storage tank based on the identified damage location (step S210). The two cargo oil storage tanks closest to the damaged location can be identified as cargo oil storage tanks that are expected to be damaged. Hereinafter, for convenience of understanding and explanation, it is assumed that T1 and T2 are identified as damaged cargo oil storage tanks.

The controller performs the rotation and width control on the hinge type partition walls 100a and 100b installed in the cargo oil storage tanks T1 and T2 identified as expected to be damaged (step S220).

Referring to FIG. 7, one of the first and second rotating walls (for example, the first rotating walls W11 and W21) for each damaged cargo oil storage tank meets with another adjacent damaged cargo oil storage tank And rotate vertically toward the same-kind tank dividing wall 150. And the first extension wall 124 may be extended to make contact with the partition wall 150 of the same kind of tank.

The other one (second rotating wall W12, W22) is located between the partition walls between the same kind of tanks that do not meet the other damage expected cargo oil storage tank and the partition walls 160a, 160b between the different kinds of tanks that meet with the laterally adjacent ballast tanks As shown in FIG. And the second extension wall 134 may extend to contact the edge.

Through this rotation and width control, the damaged cargo oil storage tanks T1 and T2 are divided into two spaces, and a space for meeting the ballast tanks B1 and B2 among the divided spaces is included in the damaged space S2 . However, since the remaining space does not belong to the damaged space S2, the size of the damaged space is significantly reduced as compared with the existing case shown in FIG.

Or the control unit may perform the rotation and width control as shown in Fig.

8, the first and second rotating walls W11 and W21, W12 and W22 are connected to the laterally neighboring ballast tanks with respect to the damaged cargo oil storage tanks T1 and T2, respectively, And is rotated so as to face both side edges of the partition walls 160a and 160b. And the first and second extension walls 134 may extend to contact the edges.

The damaged cargo oil storage tanks T1 and T2 are divided into two spaces through the rotation and width control and a space for meeting the ballast tanks B1 and B2 among the divided spaces is included in the damaged space S3 . However, since the remaining space does not belong to the damaged space S3, the size of the damaged space is considerably reduced as compared with the conventional case shown in FIG.

When the above-described rotation and width control is completed, the damaged space (S2 or S3) considerably reduced compared to the existing marine structure can be determined (step S230).

According to the present embodiments, the size of the damaged space is reduced, thereby relaxing the damage restoring force requirement and increasing the weight limit of the process module installed on the upper deck of the ship.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

10: Offshore structure 12: Hull
20, T1 ~ T8: Cargo oil storage tank 30, B1 ~ B8: Ballast tank
100, 100a, 100b: partition wall 110: hinge shaft
120: first rotating wall body 122: first shaft coupling portion
124: first extension wall 130: second rotating wall
132: second shaft coupling portion 134: second extension wall
150: the same tank interstices 160a, 160b: the different tank interstices

Claims (9)

1. An offshore structure having a plurality of cargo oil storage tanks divided into a plurality of partitions and a plurality of laterally neighboring ballast tanks,
Wherein each of the plurality of cargo oil storage tanks is provided with a hinge type partition wall dividing an internal space into two spaces,
The hinge-type partition wall includes:
A hinge shaft vertically installed at a central portion of the inner space;
And a first rotating wall body and a second rotating wall body that rotate individually with the hinge shaft as a rotation axis,
And a first shaft coupling portion and a second shaft coupling portion surrounding the hinge shaft are provided on one side of each of the first rotating wall body and the second rotating wall body,
The first shaft coupling portion and the second shaft coupling portion are disposed so as not to overlap with each other
A first extension wall and a second extension wall are provided on the other side of each of the first rotary wall and the second rotary wall so as to extend in the width direction of each of the first rotary wall and the second rotary wall,
Further comprising a control unit for separately controlling the rotation of the first rotating wall and the second rotating wall, and the extension of the first extending wall and the second extending wall in accordance with the damaged position when the offshore structure is damaged , Offshore structures delete delete 1. An offshore structure having a plurality of cargo oil storage tanks divided into a plurality of partitions and a plurality of laterally neighboring ballast tanks,
Wherein each of the plurality of cargo oil storage tanks is provided with a hinge type partition wall dividing an internal space into two spaces,
The hinge-type partition wall includes:
A hinge shaft vertically installed at a central portion of the inner space;
And a first rotating wall body and a second rotating wall body that rotate individually with the hinge shaft as a rotation axis,
And a first shaft coupling portion and a second shaft coupling portion surrounding the hinge shaft are provided on one side of each of the first rotating wall body and the second rotating wall body,
The first shaft coupling portion and the second shaft coupling portion are disposed so as not to overlap with each other
A first extension wall and a second extension wall are provided on the other side of each of the first rotary wall and the second rotary wall so as to extend in the width direction of each of the first rotary wall and the second rotary wall,
Wherein the first swivel wall and the second swivel wall have a width less than a shortest distance from the hinge shaft to the tank bulkhead. delete 5. The method according to any one of claims 1 to 4,
The first extension wall and the second extension wall each have a width greater than the longest distance from the hinge shaft to the edge between the tank bulkheads when extended from the first swivel wall and the second swivel wall, The offshore structure has a width that allows it. A method for reducing damage in an offshore structure having a plurality of cargo oil storage tanks and a plurality of laterally adjacent ballast tanks partitioned by a plurality of partitions,
Wherein each of the plurality of cargo oil storage tanks is provided with a hinge type partition wall dividing an internal space into two spaces,
Determining a damage location of the offshore structure when the damage occurs;
Identifying two adjacent cargo oil storage tanks as damaged cargo oil storage tanks based on the damage location;
And performing rotational and width control on a hinge type partition wall installed in said damaged cargo oil storage tank. 8. The method of claim 7,
Wherein the rotation and width control step comprises:
The first rotating wall is vertically disposed to the partition wall between the same kind of tanks that meet the other damage expected cargo oil storage tank with respect to the damaged cargo oil storage tank and the first extension wall is contacted with the partition walls of the same kind tanks ;
The second rotating wall body is rotated so as to face the edge between the same kind of tank partition wall not meeting the other damage expected cargo oil storage tank and the partition wall between the different kinds of tanks meeting with the laterally adjacent ballast tank, And contacting the damaging space with the contact surface. 8. The method of claim 7,
Wherein the rotation and width control step comprises:
The first and second rotating wall bodies are rotated with respect to the damaged cargo oil storage tank so as to face both side edges of the partition walls between the different kinds of tanks which meet with laterally neighboring ballast tanks, And extending in contact with both side edges.

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