KR101732381B1 - Buoyancy control system of offshore structure - Google Patents

Buoyancy control system of offshore structure Download PDF

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Publication number
KR101732381B1
KR101732381B1 KR1020150146553A KR20150146553A KR101732381B1 KR 101732381 B1 KR101732381 B1 KR 101732381B1 KR 1020150146553 A KR1020150146553 A KR 1020150146553A KR 20150146553 A KR20150146553 A KR 20150146553A KR 101732381 B1 KR101732381 B1 KR 101732381B1
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KR
South Korea
Prior art keywords
pipe
buoyancy
fuel
seawater
ballast tank
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Application number
KR1020150146553A
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Korean (ko)
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KR20170046348A (en
Inventor
조택현
송용석
Original Assignee
삼성중공업 주식회사
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Priority to KR1020150146553A priority Critical patent/KR101732381B1/en
Publication of KR20170046348A publication Critical patent/KR20170046348A/en
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Publication of KR101732381B1 publication Critical patent/KR101732381B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B11/00—Interior subdivision of hulls
    • B63B11/04—Constructional features of bunkers, e.g. structural fuel tanks, or ballast tanks, e.g. with elastic walls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B13/00—Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B17/00—Vessels parts, details, or accessories, not otherwise provided for
    • B63B17/0027—Tanks for fuel or the like ; Accessories therefor, e.g. tank filler caps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00—Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B43/02—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
    • B63B43/04—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability
    • B63B43/06—Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving stability using ballast tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00—Arrangements for supervising or controlling working operations
    • F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product

Abstract

A ballast tank (1) comprising: a fuel tank (1) disposed inside the sea structure (1) and supplying fuel to the sea structure (1); a fuel tank (1) having a first buoyancy; a ballast tank a ballast tank, a mooring line connected to the sea structure to fix the sea structure, a flow meter for measuring an amount of the fuel flowing out from the fuel tank, And a controller for controlling the tension of the mooring line based on the buoyant force.

Description

Buoyancy control system of offshore structure

The present invention relates to a buoyancy control system for a marine structure.

Barge Mounted Power Plant (BMPP) is a power plant in offshore structure. Generally, due to the characteristics of marine structures, shaking occurs depending on the sea condition. In addition, the buoyancy of the ship changes according to the change of the fuel amount in the fuel tank of the power plant, and the sea structure shakes.

There is a need for a system that fixes the offshore structure and controls the buoyancy of the offshore structure.

Korean Registered Patent No. 10-0957170 (Published on May, 2010)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a buoyancy control system for a marine structure for maintaining a constant tension of a mooring line for fixing a marine structure.

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

According to an aspect of the present invention, there is provided a buoyancy control system for a buoyancy structure of a buoyancy structure, the buoyancy control system comprising: a sea structure; A ballast tank disposed in the inside of the sea structure and having seawater flowed therein and having a second buoyant force, a mooring line connected to the sea structure to fix the sea structure, A flow meter for measuring the amount of fuel flowing out, and a controller for controlling the tension of the mooring line based on the first buoyancy and the second buoyancy.

The tension of the mooring line can be controlled so that the sum of the first buoyancy and the second buoyancy is kept constant.

The flow meter is disposed in a fuel pipe connected to the fuel tank, and the controller can calculate an increase amount of the first buoyancy by using the flow rate of the fuel measured by the flow meter.

The controller may reduce the second buoyancy by introducing the seawater into the ballast tank by an amount of increase of the first buoyancy.

Wherein the controller calculates an error between a design tension of the mooring line and a measurement tension applied to the mooring line predetermined according to the measurement value of the flowmeter and uses the error value of the design tension and the measurement tension to calculate the second buoyancy Can be adjusted.

The controller calculates an inflow amount of the seawater according to an error value between the design tension and the measurement tension and corrects an inflow amount of the seawater according to a measured value of the flow meter using the inflow amount of the seawater according to the error value .

And a valve disposed in a conduit connected to the ballast tank for blocking the seawater flowing into the ballast tank, wherein the controller controls the second buoyancy by controlling the valve.

Wherein the ballast tank includes first and second ballast tanks, the piping includes an inlet pipe through which the seawater flows into the inside of the sea structure, an outlet pipe through which the seawater flows out to the outside of the sea structure, A first pipe connected to the first ballast tank, and a second pipe connected to the second ballast tank.

Wherein the valve comprises an inlet valve disposed in the inlet pipe to shut off the inlet pipe, an outlet valve disposed in the outlet pipe to shut off the outlet pipe, and an outlet valve disposed in the first pipe to block the first pipe And a second valve disposed in the second pipe and blocking the second pipe.

The details of other embodiments are included in the detailed description and drawings.

1 is a schematic view for explaining a marine structure according to an embodiment of the present invention.
2 is a view for explaining control of a fuel tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.
3 is a view for explaining control of a ballast tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.
4 is a view for explaining control of seawater flowing into a ballast tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.
5 is a view for explaining control of seawater discharged to the outside of a ballast tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.
6 is a flowchart sequentially illustrating control of buoyancy of a marine structure using a flow meter in a buoyancy control system of a marine structure according to an embodiment of the present invention.
7 is a flowchart sequentially illustrating control of buoyancy using tension of a flow meter and a mooring line in a buoyancy control system of a marine structure according to an embodiment of the present invention.
8 is a view for explaining control of a ballast tank in a buoyancy control system for a marine structure according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

It is to be understood that when an element or layer is referred to as being "on" or " on "of another element or layer, All included. On the other hand, a device being referred to as "directly on" or "directly above" indicates that no other device or layer is interposed in between.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" May be used to readily describe a device or a relationship of components to other devices or components. Spatially relative terms should be understood to include, in addition to the orientation shown in the drawings, terms that include different orientations of the device during use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element. Thus, the exemplary term "below" can include both downward and upward directions. The elements can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

Although the first, second, etc. are used to describe various elements, components and / or sections, it is needless to say that these elements, components and / or sections are not limited by these terms. These terms are only used to distinguish one element, element or section from another element, element or section. Therefore, it goes without saying that the first element, the first element or the first section mentioned below may be the second element, the second element or the second section within the technical spirit of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that the terms "comprises" and / or "comprising" used in the specification are intended to be inclusive in a manner similar to the components, steps, operations, and / Or additions.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. A description thereof will be omitted.

1 is a schematic view for explaining a marine structure according to an embodiment of the present invention.

Referring to FIG. 1, a marine structure 110 includes a fuel tank 120 and a ballast tank 130.

The fuel tank 120 may be disposed inside the sea structure 110. The fuel tank 120 can store fuel and can supply fuel to the offshore structure 110. The fuel may be, for example, liquefied natural gas (LNG).

In FIG. 1, three fuel tanks 120 are illustrated as being disposed on the ballast tank 130 within the sea structure 110, but the technical idea of the present invention is not limited thereto. That is, in some other embodiments, the number of fuel tanks 120 disposed within the offshore structure 110 may be different. Further, in some other embodiments, the fuel tank 120 may be disposed on the side or the lower side of the ballast tank 130.

The fuel tank 120 has a first buoyancy. The first buoyancy may be varied by the use of the fuel. Specifically, when the fuel stored inside the fuel tank 120 decreases due to the use of the fuel, the first buoyancy increases. On the other hand, when the fuel stored in the fuel tank 120 increases, the first buoyancy decreases.

The ballast tank 130 includes a first ballast tank 131 and a second ballast tank 132.

The ballast tank 130 may be disposed inside the sea structure 110. The ballast tank 130 can store seawater and can control buoyancy of the offshore structure 110 using seawater inflow and outflow.

In FIG. 1, two ballast tanks 130 are illustrated as being disposed on the lower surface of the sea structure 110 in the interior of the sea structure 110, but the technical idea of the present invention is not limited thereto. That is, in some other embodiments, the offshore structure 110 may include one or more ballast tanks 130. Also, in some other embodiments, the ballast tanks 130 may be disposed on the side of the offshore structure 110.

The ballast tank 130 has a second buoyancy. The second buoyancy can be changed by the inflow and outflow of seawater. Specifically, when seawater stored inside the ballast tank 130 is reduced due to the outflow of seawater, the second buoyancy increases. On the other hand, if the seawater stored inside the ballast tank 130 is increased by the inflow of seawater, the second buoyancy decreases.

The mooring line 140 may be connected to a lower surface of the sea structure 110 to fix the sea structure. Specifically, the mooring line 140 can be fixed to the water surface of the sea structure 110 by connecting the bottom surface of the sea structure 110 to the sea floor.

In FIG. 1, five mooring lines 140 are shown connected to the lower surface of the marine structure 110, respectively, but the technical idea of the present invention is not limited thereto. That is, in some other embodiments, the number of mooring lines 140 may be different and the mooring line 140 may be connected to the side of the marine structure 110.

The buoyancy control system of a marine structure according to the technical idea of the present invention is a system for controlling the buoyancy of a marine structure by keeping the sum of the first buoyant force of the fuel tank 120 and the second buoyant force of the ballast tank 130 constant at a predetermined value, The applied tension can be kept constant at a predetermined value.

Specifically, when the amount of fuel stored in the fuel tank 120 decreases due to the use of fuel and the first buoyant force of the fuel tank 120 increases, seawater is introduced into the ballast tank 130, The second buoyant force of the tank 130 can be reduced. As a result, the sum of the first buoyant force and the second buoyant force can be kept constant, and the tension applied to the mooring line 140 can be kept constant.

When the fuel stored in the fuel tank 120 increases and the first buoyant force of the fuel tank 120 decreases, the seawater is discharged to the outside of the ballast tank 130, so that the second buoyancy of the ballast tank 130 Can be increased. As a result, the sum of the first buoyant force and the second buoyant force can be kept constant, and the tension applied to the mooring line 140 can be kept constant.

Adjusting the first buoyancy and the second buoyancy and keeping the tension of the mooring line 140 constant can be performed by the controller. Details will be described later.

2 is a view for explaining control of a fuel tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.

Referring to FIG. 2, the buoyancy control system of the offshore structure may include a fuel tank 120, a fuel pipe 121, an engine 122, a generator 123, a flow meter 150, and a controller 160.

The fuel piping 121 can connect the fuel tank 120 to the engine 122 and the generator 123. The fuel stored in the fuel tank 120 may be supplied to the engine 122 or the generator 123 through the fuel pipe 121. [

The flow meter 150 may be disposed in the fuel line 121. The flow meter 150 measures the flow rate of the fuel flowing out of the fuel tank 120 when the amount of fuel stored in the fuel tank 120 decreases as the fuel is supplied to the engine 122 or the generator 123 .

The controller 160 may calculate an increase amount of the first buoyant force of the fuel tank 120 using the fuel flow rate measured by the flow meter 150. [

3 is a view for explaining control of a ballast tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.

3, the buoyancy control system for a marine structure includes a first ballast tank 131, a second ballast tank 132, a controller 160, an inlet pipe 171, an outlet pipe 172, 173, a second pipe 174, an inlet valve 181, an outlet valve 182, a first valve 183, a second valve 184 and a pump 190.

The inflow pipe 171 is a pipe through which the seawater flows when the seawater flows into the inside of the sea structure 110. The outflow pipe 172 is a pipe through which seawater flows when seawater flows out of the sea structure 110. The inflow pipe 171 and the outflow pipe 172 may be connected to the outside of the hull of the offshore structure 110.

The first piping 173 can connect the first piping 171 and the outflow piping 172 to the first ballast tank 131. The second pipe 174 can connect the inlet pipe 171 and the outlet pipe 172 to the second ballast tank 132.

The inflow valve 181 may be disposed in the inflow pipe 171 to block seawater flowing into the interior of the sea structure 110. The outflow valve 182 may be disposed in the outflow pipe 172 to block seawater flowing out of the offshore structure 110.

The first valve 183 may be disposed in the first pipe 173 to block the flow of seawater stored in the first ballast tank 131. The second valve 184 may be disposed in the second pipe 174 to block the flow of seawater stored in the second ballast tank 132.

The pump 190 may be connected to the inflow pipe 171. The pump 190 may provide power to introduce seawater from the outside of the offshore structure 110 into the interior of the offshore structure 110.

Further, the pump 190 may be connected to the outflow pipe 172. The pump 190 may provide power to allow seawater to flow out of the interior of the offshore structure 110 from the interior of the offshore structure 110.

The controller 160 may control the inlet valve 181, the outlet valve 182, the first valve 183, and the second valve 184, respectively. Accordingly, the controller 160 can adjust the second buoyancy of the ballast tank 130 by adjusting the amount of seawater stored in the first and second ballast tanks 131 and 132.

4 is a view for explaining control of seawater flowing into a ballast tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.

3 and 4, when the seawater is introduced into the first ballast tank 131 and the second ballast tank 132, the controller 160 controls the inlet valve 181, the first valve 183, And the second valve 184 are opened, and the outlet valve 182 is closed. 4, the seawater passes through the inflow pipe 171 and the first and second pipes 173 and 174 by the operation of the pump 190 and flows into the first and second ballast tanks 131 and And may be stored in the ballast tank 132.

5 is a view for explaining control of seawater discharged to the outside of a ballast tank in a buoyancy control system of a marine structure according to an embodiment of the present invention.

3 and 5, when the seawater is flowed out of the first and second ballast tanks 131 and 132, the controller 160 controls the first valve 183, the second valve 184 And the outlet valve 182 are opened, and the inlet valve 181 is closed. 5, the seawater flows through the first and second pipes 173 and 174 and the outflow pipe 172 by the operation of the pump 190 and flows out to the outside of the sea structure 110 .

4 and 5, the pump 190 can be operated in one direction to allow the seawater to flow in and out.

6 is a flowchart sequentially illustrating control of buoyancy of a marine structure using a flow meter in a buoyancy control system of a marine structure according to an embodiment of the present invention.

Referring to FIG. 6, the flow meter 150 can measure fuel consumption. Specifically, the fuel stored in the fuel tank 120 is supplied to the engine 122 and the generator 123 to increase the fuel flow rate (S110). The flow meter 150 measures the amount of fuel flowing out of the fuel tank 120 Can be measured.

When the fuel flow rate increases, the controller 160 can receive the fuel flow rate measured by the flow meter 150. [ The controller 160 may calculate the increased buoyancy of the fuel tank 120 using the reduced fuel amount inside the fuel tank 120 (S120).

If the buoyancy of the fuel tank 120 increases, the controller 160 may control the valve to introduce seawater into the ballast tank 130 as described above (S130).

The buoyant force of the ballast tank 130 can be reduced by the seawater introduced into the ballast tank 130. [ The seawater may be introduced into the ballast tank 130 until the increased buoyancy of the fuel tank 120 and the reduced buoyancy of the ballast tank 130 become equal (S140).

When the increased buoyancy of the fuel tank 120 and the reduced buoyancy of the ballast tank 130 become the same, the controller 160 may control the valve to block the seawater flowing into the ballast tank 130.

The buoyancy of the offshore structure 110 can be kept constant through the buoyancy control of the controller 160. [

7 is a flowchart sequentially illustrating control of buoyancy using tension of a flow meter and a mooring line in a buoyancy control system of a marine structure according to an embodiment of the present invention.

Referring to FIG. 7, the amount of fuel used increases, and the fuel flow rate measured in the flow meter 150 may increase (S210).

When the fuel flow rate increases, the controller 160 may calculate the increased buoyancy of the fuel tank 120 using the reduced fuel amount inside the fuel tank 120 (S220).

The controller 160 may compare the design tension of the mooring line 140 and the measurement tension applied to the mooring line 140 according to the measured value of the flow meter 150 at step S230.

If an error occurs between the design tension and the measurement tension of the mooring line 140, the controller 160 may calculate a correction value of the inflow amount of the seawater according to the error value (S240).

If the design tension and the measurement tension of the mooring line 140 are the same, the controller 160 can control the valve to introduce seawater into the ballast tank 130, as described above. If an error occurs in the design tension and the measurement tension of the mooring line 140, the controller 160 may determine the amount of seawater flowing into the ballast tank 130 using the correction value of the inflow amount of the seawater at step S250.

The seawater may be introduced into the ballast tank 130 until the increased buoyancy of the fuel tank 120 and the reduced buoyancy of the ballast tank 130 become equal (S260).

When the increased buoyancy of the fuel tank 120 and the reduced buoyancy of the ballast tank 130 become the same, the controller 160 may control the valve to block the seawater flowing into the ballast tank 130.

The controller 160 can maintain the buoyant force of the offshore structure 110 constant by using the measurement value of the flow meter 150, the measurement tension, and the design tension.

The buoyancy control system of a marine structure according to the technical idea of the present invention is configured such that the controller 160 calculates the buoyancy of the fuel tank 120 and the ballast pressure of the ballast using the measurement value of the flow meter 150, The tension applied to the mooring line 140 can be kept constant by keeping the sum of the buoyant forces of the tank 130 constant. As a result, the thickness of the mooring line 140 can be reduced, and the maintenance and repairing cost of the mooring line 140 can be reduced.

8 is a view for explaining control of a ballast tank in a buoyancy control system for a marine structure according to another embodiment of the present invention. The difference from the control of the ballast tank of FIG. 3 will be mainly described.

8, the buoyancy control system for a marine structure includes a first ballast tank 231, a second ballast tank 232, a controller 260, an inlet pipe 271, an outlet pipe 272, 273, a second pipe 274, a first valve 281, a second valve 282, a third valve 283, a fourth valve 284, an inflow pump 290 and a discharge pump 291 .

The first pipe 273 can connect the first ballast tank 231 and the second ballast tank 232 to the inflow pipe 271. The second pipe 274 can connect the first ballast tank 231 and the second ballast tank 232 to the outflow pipe 272.

The first valve 281 may be disposed in the first pipe 273 to block seawater flowing into the first ballast tank 231. The second valve 282 is disposed in the second pipe 274 to block seawater flowing out of the first ballast tank 231.

The third valve 283 may be disposed in the first pipe 273 to block the seawater flowing into the second ballast tank 232. The fourth valve 284 is disposed in the second pipe 274 to block seawater flowing out of the second ballast tank 232.

The inflow pump 290 may be connected to the inflow pipe 271 to provide power for allowing the seawater to flow into the interior of the sea structure 110 from the outside of the sea structure 110.

The outflow pump 291 may be connected to the outflow pipe 272 to provide a power for discharging seawater from the interior of the offshore structure 110 to the outside of the offshore structure 110.

Thus, the buoyancy control system of the offshore structure of FIG. 8 is arranged along the inflow pump 290 and the outflow pump 291 in comparison with the buoyancy control system of the offshore structure of FIG. 3 to separately control the inflow and outflow of seawater There is an advantage that seawater flowing into and out of the first and second ballast tanks 231 and 232 can be effectively controlled.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

110: Marine structure 120: Fuel tank
130: Ballast tank 140: Mooring line
150: flow meter 160: controller
171: Inlet piping 172: Outflow piping
181: inlet valve 182: outlet valve
190: pump

Claims (9)

Marine structures;
A fuel tank disposed inside the sea structure for supplying fuel to the sea structure and having a first buoyancy;
A ballast tank disposed inside the sea structure and having seawater flowed in and having a second buoyancy;
A mooring line connected to the sea structure to fix the sea structure;
A flow meter for measuring an amount of the fuel flowing out of the fuel tank; And
And a controller for controlling the tension of the mooring line based on the first buoyancy and the second buoyancy,
The controller comprising:
Calculating an error between a design tension of the mooring line and a measurement tension applied to the mooring line predetermined according to the measured value of the flow meter,
And the second buoyant force is adjusted by using an error value between the design tension and the measurement tension. The method according to claim 1,
Wherein a sum of the first buoyant force and the second buoyant force is kept constant to control the tension of the mooring line. 3. The method of claim 2,
Wherein the flow meter is disposed in a fuel pipe connected to the fuel tank,
Wherein the controller calculates an increase amount of the first buoyancy by using an outflow amount of the fuel measured by the flow meter. delete delete The method according to claim 1,
The controller comprising:
Calculating an inflow amount of the seawater according to an error value between the design tension and the measurement tension,
And corrects an inflow amount of the seawater according to a measured value of the flow meter by using an inflow amount of the seawater according to the error value. The method according to claim 1,
A ballast tank disposed in a pipe connected to the ballast tank,
Further comprising a valve for blocking the seawater flowing into and out of the ballast tank,
Wherein the controller controls the second buoyancy by controlling the valve. 8. The method of claim 7,
Wherein the ballast tank includes first and second ballast tanks,
In the above-described piping,
An inflow pipe through which the seawater flows into the inside of the sea structure,
An outflow pipe through which the seawater flows out of the marine structure,
A first pipe connected to the first ballast tank,
And a second pipe connected to the second ballast tank. 9. The method of claim 8,
Wherein the valve comprises:
An inflow valve disposed in the inflow pipe to block the inflow pipe,
An outlet valve disposed in the outlet pipe for blocking the outlet pipe,
A first valve disposed in the first pipe to block the first pipe,
And a second valve disposed in the second pipe to block the second pipe.
KR1020150146553A 2015-10-21 2015-10-21 Buoyancy control system of offshore structure KR101732381B1 (en)

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