KR102460619B1 - Floating marine structure with outer type liquefied gas storage tank - Google Patents

Abstract

A floating offshore structure having an external liquefied gas storage unit is disclosed. Floating offshore structure having an external liquefied gas storage unit according to an embodiment of the present invention, floating in the ocean, a floating structure body in which a predetermined gas liquefaction facility for producing liquefied gas is disposed; and an external liquefied gas storage unit connected to the gas liquefaction facility and disposed on the outside of the floating structure body, and forming a place for storing liquefied gas produced through the gas liquefaction facility.

Description

Floating marine structure with outer type liquefied gas storage tank

The present invention relates to a floating marine structure having an external liquefied gas storage unit, and more particularly, since an external liquefied gas storage unit is applied unlike the prior art, even if an accident such as a fire or explosion occurs, It relates to a floating offshore structure that can effectively prevent diffusion into an area.

Liquefied gas refers to a gas made into a liquid by cooling or compressing it. In general, when a gas is lowered to a temperature below its critical temperature, it is condensed into a liquid or changed to a state that can become a liquid when compressed (this is called a vapor state).

Liquefied petroleum gas and liquefied natural gas (LNG) are mentioned as liquefied gas. Among them, liquefied natural gas (LNG) is considered as an energy for preventing global warming due to its low price, sea transport, and low carbon dioxide emission. Accordingly, worldwide demand for liquefied natural gas (LNG) production, transportation, and storage facilities (ships) is increasing.

On the other hand, floating offshore structures such as LNG FPSO (Floating Production Storage and Offloading) produce natural gas by drilling the seabed while floating in the sea where the flow occurs, and process and liquefy the produced natural gas directly at sea. carry out

In order to perform such an operation, a series of facilities for producing or processing natural gas to make liquefied gas, power generation, and fueling (bunkering), for example, a gas liquefaction facility is required. Typically, the gas liquefaction facility may be disposed in the structure body.

In particular, a device for substantially storing liquefied liquefied gas, that is, a liquefied gas storage tank, is also generally disposed in the structure body.

However, in the case of a conventional floating offshore structure that is connected to a neighboring gas liquefaction facility in a state in which the liquefied gas storage tank is disposed on the structure body, hydrocarbons in the liquefied gas storage tank act as fuel in case of fire or explosion. Considering that the flame is highly likely to spread to the entire area of the structure body, including gas liquefaction facilities or residences, and this can cause significant human or material damage, it is urgent to prepare a fundamental alternative to prevent this. to be.

Korean Intellectual Property Office Application No. 20-2015-0006812

Therefore, the technical problem to be achieved by the present invention is that, unlike the prior art, since an external type liquefied gas storage unit is applied, even if an accident such as a fire or explosion occurs, it can be effectively prevented from spreading to areas such as surrounding facilities or residences, It is to provide a floating offshore structure having an external liquefied gas storage that can minimize human or material damage.

According to one aspect of the present invention, floating structure body floating in the ocean, a predetermined gas liquefaction facility for producing liquefied gas is disposed; and an external liquefied gas storage unit connected to the gas liquefaction facility and disposed on the outside of the floating structure body, the external liquefied gas storage unit forming a storage place for liquefied gas produced through the gas liquefaction facility A formal offshore structure may be provided.

It is provided in the floating structure body and forms an intermediate step in which the liquefied gas of the gas liquefaction facility side is supplied to the external liquefied gas storage unit, and the liquefied gas is generated or the liquefied gas is supplied to the external liquefied gas storage unit (bunkering). ) to the intermediate stage space for gas power generation and refueling; and a gas flow line part connected to the intermediate stage space part for gas power generation and oil supply and the external liquefied gas storage part, and forming a flow path through which the liquefied gas flows.

The gas flow line unit may include: a first gas line connected to the intermediate stage space for gas power generation and oil supply; a second gas line connected to the external liquefied gas storage unit; and a first connector provided at an end of the first gas line and a second connector provided at an end of the second gas line, both ends are connected to each other so as to be flexible between the first and second connectors It may include a flexible gas line for connecting.

a plurality of valves provided in pairs to be spaced apart from each other on one side of the gas flow line part, and for controlling the flow of the liquefied gas at the corresponding positions; a line cutting unit disposed between the plurality of valves and configured to cut the gas flow line portion at a corresponding position; and a controller for controlling the operation of the plurality of valves so that the plurality of valves are individually turned on/off based on a predetermined input signal.

The external liquefied gas storage unit is disposed below the sea level, the liquefied gas storage tank in which the liquefied gas is substantially stored; and a tank housing having a cavity in which the liquefied gas storage tank is disposed is formed therein and is disposed to surround the liquefied gas storage tank from the outside of the liquefied gas storage tank to protect the liquefied gas storage tank. have.

a position fixing wire for fixing the position of the external liquefied gas storage unit with respect to the seabed so that the external liquefied gas storage unit can be fixed in position without moving along the flow of seawater; and a towing unit provided in the external liquefied gas storage unit for towing the external liquefied gas storage unit, wherein the floating offshore structure is a Floating Storage and Regasification Unit (FSRU) or It may be a Floating Production Storage Offloading (FPSO).

According to the present invention, unlike the prior art, since an external liquefied gas storage unit is applied, even if an accident such as a fire or explosion occurs, it is possible to effectively prevent the spread to surrounding facilities or areas such as residential areas, thereby reducing human or material damage. can be minimized.

1 is a schematic configuration diagram of a floating offshore structure having an external liquefied gas storage unit according to an embodiment of the present invention.
FIG. 2 is a cross-sectional structural view of an external liquefied gas storage unit applied to FIG. 1 .
3 is a view of a state in which the liquefied gas storage tank is removed in FIG. 2 .
FIG. 4 is a control block diagram for a floating offshore structure having an external liquefied gas storage unit of FIG. 1 .
5 is a control block diagram of a floating offshore structure having an external liquefied gas storage unit according to another embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

1 is a schematic configuration diagram of a floating offshore structure having an external liquefied gas storage unit according to an embodiment of the present invention, FIG. 2 is a cross-sectional structural view of an external liquefied gas storage unit applied to FIG. 1 , FIG. 3 is FIG. 2 It is a view of the state in which the liquefied gas storage tank is removed, and FIG. 4 is a control block diagram for a floating offshore structure having an external liquefied gas storage unit of FIG. 1 .

Referring to these drawings, but mainly referring to FIG. 1 , the floating offshore structure according to this embodiment uses an external liquefied gas storage unit 130 unlike the conventional one, so even if an accident such as a fire or explosion occurs, surrounding facilities or residence It is possible to effectively prevent the spread to areas such as the sphere 111, thereby minimizing human or material damage.

The floating offshore structure according to this embodiment that can provide such an effect may include a floating structure body 110 and an external liquefied gas storage unit 130 disposed outside of the floating structure body 110 .

The floating structure body 110 refers to a structure disposed in a floating state at a predetermined position on the sea. That is, the floating offshore structure according to this embodiment can be variously applied to a floating storage and regasification unit (FSRU) or a floating production storage offloading (FPSO). , the external structure of such a floating offshore structure may correspond to the floating structure body 110 .

Here, the floating structure body 110 generally does not include a propulsion means in that it can be fixed in a floating state in a certain place during drilling, but it does not matter even if the propulsion means is applied. Accordingly, the floating structure body 110 may be varied from a fixed structure to a supported structure such as a ship.

The floating structure body 110 is provided with a residence 111 in which the worker resides. The residence 111 may be arranged in the form of a building on one side of the upper side of the deck. Depending on the size of the floating structure body 110 , the size of the residence 111 may vary.

The floating structure body 110 is provided with a predetermined gas liquefaction facility 120 for producing liquefied gas. The gas liquefaction facility 120, which may be composed of a plurality of devices, is dispersedly disposed in the space in the floating structure body 110, including the upper area of the signboard, and is connected to each other to contribute to manufacturing liquefied gas.

The gas liquefaction facility 120 may include devices for producing liquefied gas, that is, a liquefaction process device 121 , a power generation module device 122 , a utility device 123 , and a gas pretreatment device 124 . .

The liquefaction process device 121 serves to make liquefied gas by directly processing and liquefying natural gas produced by drilling the seabed at sea to perform liquefaction.

The purpose of liquefying natural gas is to facilitate transportation. The gaseous natural gas has a very large volume, so transportation efficiency is low. Therefore, gaseous natural gas (NG) is cooled to -162 degrees below zero to reduce its volume and make it into liquefied natural gas (LNG). That is, natural gas extracted and purified from a production area is converted into a liquid state through a liquefaction process for the purpose of long-distance transportation or to store a large amount of natural gas in a small storage space. When it is cooled and made into liquefied gas in a liquid state, the volume is reduced to 1/600 of that of natural gas (NG), so transportation and storage are easy, and the liquefaction process device 121 is responsible for this.

The liquefaction process by the liquefaction process device 121 may be various, such as an expansion method, a multi-stage freezing method, a mixed freezing method, and it does not matter which method is applied. That is, the scope of the present invention is not limited to a specific liquefaction process.

The power generation module device 122 generates and supplies electricity required during the liquefaction process, and the utility device 123 is responsible for the process and control for the liquefaction process. In addition, the gas pre-processing device 124 may perform a preceding operation of pre-processing the gas drilled from the seabed into natural gas.

Although briefly described, devices or modules other than these devices 121 to 124 may be included in the gas liquefaction facility 120, for which reference is made to techniques previously applied by the present applicant and omitted here for convenience.

The external liquefied gas storage unit 130 is connected to the gas liquefaction facility 120 , and forms a place for storing liquefied gas produced through the gas liquefaction facility 120 .

In particular, in this embodiment, the external liquefied gas storage unit 130 is disposed outside the floating structure body 110, that is, below the sea level. Therefore, it is advantageous not only to prevent the spread of damage in case of fire or explosion, but also to facilitate management. This will be described later.

As shown in detail in FIGS. 2 and 3 , the external liquefied gas storage unit 130 is disposed below the sea level, and a liquefied gas storage tank 131 in which liquefied gas is substantially stored, and a liquefied gas storage tank 131 . It may include a tank housing 132 that supports while protecting the liquefied gas storage tank 131 from the outside of the.

The liquefied gas storage tank 131 forms a place where liquefied gas is substantially stored. As described above, liquefied gas is made into a liquid by cooling or compressing a gas, so it is sensitive to temperature and pressure. Therefore, the liquefied gas storage tank 131 may be applied as a structure at a level that can correspond to the temperature and pressure of a desired condition, for example, a structure such as a cargo hold.

The tank housing 132 is disposed to surround the liquefied gas storage tank 131 from the outside of the liquefied gas storage tank 131 to protect the liquefied gas storage tank 131 .

A cavity 133 in which the liquefied gas storage tank 131 is disposed is formed in the tank housing 132 . The cavity 133 may be supported on the outer wall of the tank housing 132 by a plurality of ribs 135 . In addition, an air gap part 134 (air gap part) is formed between the outer wall of the tank housing 132 and the outside of the cavity 133 . Ordinary air may be filled in the air gap part 134 or a vacuum state may be maintained.

In disposing the external liquefied gas storage unit 130 having such a structure on the outside of the floating structure body 110, when the external liquefied gas storage unit 130 is disposed below the sea level as in this embodiment, the liquefied gas storage tank (131) has the advantage that it does not receive external air and solar radiation. In addition, under the influence of seawater having a relatively constant temperature, there is an advantage that it can be easy to calculate the amount of heat required for the liquefied gas in the liquefied gas storage tank 131 .

However, considering that the heat capacity of water is large, when water is in direct contact with the liquefied gas storage tank 131 , a large amount of heat loss occurs and the evaporation rate (BOR, Boil Off Rate) of the liquefied gas may increase.

Therefore, in order to prevent this, in this embodiment, the tank housing 132 is separately made as described above, the cavity 133 is formed therein, and the liquefied gas storage tank 131 is disposed in the cavity 133, An air gap part (134, air gap part) of air or vacuum is formed between the liquefied gas storage tank 131 and the outer wall of the tank housing 132 . When the tank housing 132 of such an efficient structure is applied, heat loss of the liquefied gas storage tank 131 is reduced, thereby remarkably reducing the evaporation rate (BOR) of the liquefied gas.

The external liquefied gas storage unit 130 is disposed below the sea level as described above. Therefore, the external liquefied gas storage unit 130 may move arbitrarily by an external force such as a flow of seawater, and a position fixing wire 141 is applied to prevent this.

The position fixing wire 141 serves to position the external liquefied gas storage unit 130 with respect to the seabed so that the external liquefied gas storage unit 130 can be fixed in position without moving along the flow of seawater. In this case, the seabed may refer to the seabed substantially, or may be a separate frame fixing structure 142 disposed on the seabed as shown in FIG. 1 .

As will be described later, in the case of this embodiment, in an emergency such as a fire or explosion, the external liquefied gas storage unit 130 is separated to reduce the spread of damage.

However, when the emergency situation is over, the external liquefied gas storage unit 130 must be recovered. That is, it is possible to recover the external liquefied gas storage unit 130 using a special ship such as a tugboat. At this time, the towing unit 144 is applied to the external liquefied gas storage unit 130 so that a line for towing can be hung or pulled. .

The towing unit 144 may be applied as a kind of line, that is, a wire, and may be used as a portion connected or connected to a special line such as a towing line.

In the case of this embodiment, the towing unit 144 is shown as a simple line (line), but the towing unit 144 may be various, including a chain, a hook ring, and the like, so the scope of the present invention is not limited to the shape of the drawing.

On the other hand, in the floating offshore structure according to this embodiment, it is connected to the intermediate stage space 150 for gas power generation and refueling, the intermediate stage space unit 150 for gas power generation and refueling, and the external liquefied gas storage unit 130 . A gas flow line unit 160 is further provided.

The intermediate stage space 150 for gas power generation and oil supply is provided in the floating structure body 110 and forms an intermediate stage through which liquefied gas on the gas liquefaction facility 120 side is supplied to the external liquefied gas storage unit 130 . do.

In other words, the intermediate stage space unit 150 for gas power generation and oil supply refers to a predetermined intermediate facility for generating liquefied gas or refueling the liquefied gas to the external liquefied gas storage unit 130 . The actual storage of the liquefied gas is in charge of the liquefied gas storage tank 131 described above.

And the gas flow line unit 160 is connected to the intermediate stage space 150 for gas power generation and oil supply and the external liquefied gas storage unit 130, and forms a flow path through which the liquefied gas flows.

By cutting off a region of the gas flow line unit 160 in case of fire or explosion, hydrocarbons in the liquefied gas storage tank 131 act as fuel, and the flame includes the gas liquefaction facility 120 or the residence 111 . It is possible to effectively prevent spreading to the entire area of the floating structure body 110 .

The gas flow line unit 160 includes a first gas line 151 connected to the intermediate stage space unit 150 for gas power generation and oil supply, and a second gas line connected to the external liquefied gas storage unit 130 side ( 152 , and a flexible gas line 165 .

Both ends of the flexible gas line 165 are connected to a first connector 163 provided at an end of the first gas line 151 and a second connector 154 provided at an end of the second gas line 152 , , a flexible (flexible) connection between the first and second connectors (163, 164).

Since the flexible gas line 165 is applied, the length between the intermediate stage space 150 and the external liquefied gas storage unit 130 for gas power generation and oil supply is not constrained. That is, since the length between the intermediate stage space 150 for gas power generation and refueling and the external liquefied gas storage unit 130 can be connected with a certain margin, the intermediate stage space unit 150 for gas power generation and refueling and the external liquefied gas Even if the storage unit 130 oscillates or moves slightly, the connection parts including the first and second gas lines 151 and 152 are not damaged.

On the other hand, in the case of this embodiment, in order to cope with an emergency situation, that is, in case of a fire or explosion, hydrocarbon in the liquefied gas storage tank 131 acts as a fuel, and the flame is generated by the gas liquefaction facility 120 or the residence 111 ) to prevent spreading to the entire area of the floating structure body 110, including a plurality of valves 171 and 172, that is, the first and second valves 171 and 172, and the line cutting unit 173, line cutting unit), and a controller 190 may be provided.

The first and second valves 171 and 172 are provided as at least one pair on one side of the gas flow line unit 160 , that is, spaced apart from each other on the second gas line 162 , and at the corresponding position, the second gas line 162 . ) to control the flow of liquefied gas along the

A pair of first and second valves 171 and 172 are applied to be spaced apart from each other on the second gas line 162 to prevent loss of liquefied gas as well as safety. When an emergency occurs, the first and second valves 171 and 172 are closed.

The line cutting unit 173 is disposed between the first and second valves 171 and 172 and serves to physically cut the second gas line 162 at the corresponding position.

The controller 190 controls the operations of the first and second valves 171 and 172 so that the first and second valves 171 and 172 are individually turned on/off based on a predetermined input signal. In other words, the operations of the first and second valves 171 and 172 may be individually turned on/off by the controller 190 .

Let's look at this in more detail. When a fire or explosion occurs, the controller 190 controls the first valve 171 and the second valve 172 to close sequentially, and the first valve 171 and the second valve 172 are closed. When confirmed, the second gas line 162 between the first valve 171 and the second valve 172 is physically cut by the line cutting unit 173 to prevent damage from spreading. That is, since the first valve 171 and the second valve 172 are closed, the liquefied gas in the liquefied gas storage tank 131 does not leak, nor is it delivered to the intermediate stage space 150 for gas power generation and refueling. This can prevent the spread of harm.

The controller 190 performing this role may include a central processing unit (CPU) 191, a memory (192, MEMORY), and a support circuit (193, SUPPORT CIRCUIT).

The central processing unit 191 is industrially used to control the operation of the first and second valves 171 and 172 so that the first and second valves 171 and 172 are individually operated on / off in this embodiment. It may be one of a variety of computer processors that may be applied.

The memory 192 (MEMORY) is connected to the central processing unit (191). The memory 192 is a computer-readable recording medium, which may be installed locally or remotely, and may be easily available such as random access memory (RAM), ROM, floppy disk, hard disk, or any digital storage form. It may be at least one memory.

The support circuit 193 (SUPPORT CIRCUIT) is coupled with the central processing unit 191 to support typical operations of the processor. The support circuit 193 may include a cache, a power supply, a clock circuit, an input/output circuit, a subsystem, and the like.

In this embodiment, the controller 190 controls the operation of the first and second valves 171 and 172 so that the first and second valves 171 and 172 are individually operated on / off, such a series of controls Processes and the like may be stored in memory 192 . Typically, software routines may be stored in memory 192 . Software routines may also be stored or executed by other central processing units (not shown).

Although the process according to the present invention has been described as being executed by a software routine, it is also possible that at least some of the processes of the present invention are performed by hardware. As such, the processes of the present invention may be implemented in software executed on a computer system, implemented in hardware such as an integrated circuit, or implemented by a combination of software and hardware.

The operation of the floating offshore structure having such a configuration is as follows.

Normally, natural gas is processed into liquefied gas through the gas liquefaction facility 120, and the processed liquefied gas is disposed below the sea level through the intermediate stage space 150 and gas flow line unit 160 for gas power generation and oil supply. It is stored in the liquefied gas storage tank 131 of the external liquefied gas storage unit 130 to be.

On the other hand, when a fire or explosion occurs on one side of the floating structure body 110, the first valve 171 and the second valve 172 are sequentially closed under the control of the operator.

When it is confirmed that the first valve 171 and the second valve 172 are closed, the line cutting unit 173 physically cuts the second gas line 162 between the first valve 171 and the second valve 172 . cut to the cut to deal with emergency situations.

As such, when the first valve 171 and the second valve 172 are closed, the second valve 172 is blocked so that the liquefied gas in the liquefied gas storage tank 131 does not leak, and the first valve 171 is blocked by the gas Since gas or seawater is not transmitted toward the intermediate stage space 150 for power generation and refueling, the spread of damage can be reduced.

According to this embodiment having the structure and action as described above, unlike the prior art, since the external liquefied gas storage unit 130 is applied, even if an accident such as a fire or explosion occurs, areas such as surrounding facilities or residence 111 It is possible to effectively prevent the spread of the disease, thereby minimizing human or material damage.

5 is a control block diagram of a floating offshore structure having an external liquefied gas storage unit according to another embodiment of the present invention.

Referring to this figure, the floating offshore structure according to the present embodiment may further include a fire detection unit 280 and a notification unit 282 linked to the controller 290 .

The fire detection unit 280 may include a kind of sensors for detecting a fire, and may be applied to the floating structure body 110 in plurality for each location.

When a plurality of fire detection units 280 are applied, it can be known whether a fire occurs in the entire area of the floating structure body 110 . Accordingly, the fire detection unit 280 may apply sensors that are pre-installed on the floating structure body 110 .

The notification unit 282 serves to inform the outside whether or not to drive the line cutting unit 173. It does not matter whether it is applied in any form such as text or voice.

As such, when the fire detection unit 280 and the notification unit 282 are applied, the controller 290 turns on/off the first and second valves 171 and 172 individually based on the detection signal of the fire detection unit 280 ( on/off), while controlling the operations of the first and second valves 171 and 172 to operate, the operation of the notification unit 282 is automatically controlled so that the notification unit 282 is operated.

For example, in this embodiment, when a fire occurs, unlike the previous embodiment, the first and second valves 171 and 172 are automatically closed immediately without operator action, thereby reducing additional damage.

However, it is difficult if the second gas line 162 is cut and the external liquefied gas storage unit 130 falls off despite a small fire that can be easily extinguished.

Therefore, the controller 290 controls the first and second valves 171 and 172 to automatically close once a fire occurs regardless of whether there is a small or large fire, while operating the notification unit 282 to activate the line cutting unit 173. Through this, it is possible to closely grasp again whether the second gas line 162 must be cut. Accordingly, unnecessary loss can be prevented.

Even if this embodiment is applied, unlike the prior art, since the external liquefied gas storage unit 130 is applied, even if an accident such as a fire or explosion occurs, it is possible to effectively prevent the spread to surrounding facilities or areas such as the residence 111, As a result, human or material damage can be minimized.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations shall fall within the scope of the claims of the present invention.

110: floating structure body 111: residence
120: gas liquefaction equipment 121: liquefaction process equipment
122: power generation module device 123: utility device
124: gas pretreatment device 130: external liquefied gas storage unit
131: liquefied gas storage tank 132: tank housing
133: cavity 134: air gap part
141: position fixing wire 145: towing unit
150: Intermediate space for gas power generation and oil supply
160: gas flow line part 161: first gas line
162: second gas line 163: first connector
164: second connector 165: flexible gas line
171: first valve 172: second valve
173: line cutting unit 190: controller

Claims (6)

Floating structure body floating in the ocean, in which a predetermined gas liquefaction facility for producing liquefied gas is disposed;
an external liquefied gas storage unit connected to the gas liquefaction facility and disposed on the outside of the floating structure body to form a storage place for liquefied gas produced through the gas liquefaction facility;
It is provided in the floating structure body and forms an intermediate step in which the liquefied gas of the gas liquefaction facility side is supplied to the external liquefied gas storage unit, and the liquefied gas is generated or the liquefied gas is supplied to the external liquefied gas storage unit (bunkering). ) to the intermediate stage space for gas power generation and refueling;
a gas flow line part connected to the intermediate stage space part for gas power generation and oil supply and the external liquefied gas storage part, and forming a flow path through which the liquefied gas flows;
a plurality of valves provided in pairs to be spaced apart from each other on one side of the gas flow line part, and for controlling the flow of the liquefied gas at the corresponding positions;
a line cutting unit disposed between the plurality of valves and configured to cut the gas flow line portion at a corresponding position;
a plurality of fire detection units applied to the floating structure body for each location and detecting whether a fire has occurred at the corresponding location;
a notification unit as a means for informing the outside whether to drive the line cutting unit; and
A controller for controlling the operation of the plurality of valves so that the plurality of valves are individually operated on/off based on a predetermined input signal,
The controller controls the operation of the plurality of valves so that the plurality of valves are individually turned on/off based on the detection signal of the fire detection unit, while controlling the operation of the notification unit so that the notification unit is operated A floating offshore structure with an external liquefied gas storage unit that automatically controls. delete According to claim 1,
The gas flow line unit,
a first gas line connected to the intermediate stage space for gas power generation and oil supply;
a second gas line connected to the external liquefied gas storage unit; and
Both ends are connected to a first connector provided at an end of the first gas line and a second connector provided at an end of the second gas line, and the first and second connectors are flexibly connected. A floating offshore structure having an external liquefied gas storage unit, including a flexible gas line to: delete delete delete

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