KR101599294B1 - Loading and unloading apparatus for storage tanks and floating structure having the apparatus - Google Patents

Abstract

In the present invention, instead of providing a pump tower for each storage tank, a pipe capable of connecting the respective storage tanks to each other is installed, and a storage capable of reducing the number of pump towers by loading and unloading the liquefied gas through the pipe A loading and unloading device for the tank, and a floating structure having the loading and unloading device.

According to the present invention, there is provided a loading and unloading apparatus for a storage tank for loading or unloading liquefied gas in a storage tank for storing liquefied gas, which is installed in a plurality of rows inside a hull of a floating structure used floating in the sea, An internal pump installed in one of the storage tanks adjacent in the width direction; An external pump installed outside the storage tank; A loading line and a loading line extending along the longitudinal direction of the hull so as to penetrate the storage tanks to connect between the storage tanks in which the internal pumps are not installed and the external pumps; A loading and unloading device for the storage tank, and a floating structure having the loading and unloading device.

Floating structure, storage tank, liquefied gas, two row arrangement, loading, unloading, pump tower

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading and unloading apparatus for a storage tank and a floating structure having the loading and unloading apparatus,

The present invention relates to a loading and unloading apparatus capable of loading or unloading a liquefied gas into a storage tank disposed inside a hull of a floating structure and capable of storing liquefied gas, and more particularly, A loading and unloading device of a storage tank capable of reducing the number of pump towers by installing piping which can connect the respective storage tanks to each other and loading and unloading the liquefied gas through the piping, To a floating structure having a cargo handling device.

Natural gas is transported in the form of gas through land or sea gas piping, or transported to a remote location where it is stored in a transport line in the form of liquefied gas, such as LNG or LPG. Liquefied natural gas is obtained by cooling natural gas at cryogenic temperatures (approximately -163 ° C), and its volume is reduced to approximately 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.

LNG carriers for loading LNG and landing on the sea, including LNG storage tanks (often referred to as 'cargo holds'), that can withstand cryogenic temperatures of liquefied natural gas. The LNG storage tank installed inside the LNG carrier can be classified into independent type and membrane type depending on whether the load of the cargo directly acts on the insulation.

There are SPB type or Moss type storage tanks in the independent tank type storage tanks, and this type of storage tanks greatly increases the manufacturing cost of the storage tanks because a large amount of non-ferrous metal is used as the main material. Membrane-type storage tanks are currently used as LNG storage tanks. Membrane-type storage tanks are a proven technology that has been applied to the LNG storage tank field at a relatively low price, without causing safety problems for a long period of time .

Membrane-type storage tanks are again divided into GTT NO 96 type and Mark III type. Such a storage tank structure is described in U.S. Patent Nos. 5,269,247 and 5,501,359. The structure of the MOSS type independent storage tank is described in Korean Patent No. 10-15063 and the structure of the SPB type independent storage tank is described in Korean Patent No. 10-305513.

The GTT NO 96 type storage tank is composed of a primary sealing wall and a secondary sealing wall made of Invar steel (36% Ni) 0.5 to 0.7 mm thick, a plywood box and a perlite ) And the like are alternately stacked on the inner surface of the hull.

In the case of the GTT NO 96 type, the primary sealing wall and the secondary sealing wall have almost the same level of liquid tightness and strength, so that the secondary sealing wall can safely support the cargo for a considerable period of time at the time of leakage of the primary sealing wall . In addition, since the membrane of GTT NO 96 type is linear, it is easier to weld than the Mark Ⅲ type corrugated membrane, and the rate of automation is high. However, the overall welding field is longer than that of Mark III type. In case of GTT NO 96 type, Double Couple is used to support the insulation box (ie, insulation wall).

On the other hand, the Mark III type storage tank comprises a secondary sealing wall made of a 1.2 mm thick stainless steel membrane primary sealing wall and a triplex, and a polyurethane foam or the like And the primary insulation wall and the secondary insulation wall are alternately stacked on the inner surface of the hull.

In the case of the Mark III type, the sealing wall has a corrugated wrinkle portion, and the contraction caused by the LNG at an extremely low temperature is absorbed by the corrugated wrinkle portion, so that no large stress is generated in the membrane. The Mark III type heat dissipation system is not easy to reinforce due to its internal structure. Due to the nature of the secondary sealing wall, it has a weak function to prevent LNG leakage compared with the secondary sealing wall of GTT NO 96 type.

The membrane-type liquefied natural gas storage tank described above is inferior to the sloshing problem because of its weak stiffness due to its structural characteristics. Sloshing refers to a phenomenon in which a liquid material contained in a storage tank, that is, a liquefied gas such as LNG, flows when a ship moves in various sea conditions, and the wall surface of the storage tank is severely impacted by sloshing .

Since the sloshing phenomenon necessarily occurs during the operation of the ship, it is necessary to design the storage tank structure so as to have sufficient strength to withstand the impact force by sloshing.

A method of forming upper and lower chamfers inclined at approximately 45 degrees on the upper and lower sides of the storage tank to reduce the sloshing impact force of the liquid cargo such as LNG and LPG, Has been used.

In the case of a conventional storage tank having a chamfer, the problem caused by the sloshing phenomenon can be solved to some extent by forming chamfers at the upper and lower portions of the storage tank. However, as the transportation line gradually becomes larger, the size of the storage tank becomes larger, Impact caused by Xing was also greatly increased.

As the capacity of the storage tank increases, the impact force due to sloshing increases. In addition, as the load of various devices installed on the upper part of the storage tank increases, it becomes necessary to reinforce the storage tank to support the load of the upper structure Respectively.

In recent years, there has been an increasing demand for marine plants such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (Floating Storage and Regasification Unit) It is required to solve the sloshing problem and the load problem of the superstructure.

LNG FPSO is a floating structure used to produce and liquefy natural gas directly from the sea and store it in a storage tank and, if necessary, to transfer the LNG stored in this storage tank to an LNG carrier. In addition, the LNG FSRU is a floating structure that stores LNG unloaded from LNG carriers in offshore water, stores it in a storage tank, vaporizes LNG if necessary, and supplies it to the customer.

There has been a problem in that the arrangement of the upper structure is restricted in consideration of the structure and strength of the storage tank installed in the hull in the case of the floating structure having various facilities such as LNG FPSO and LNG FSRU.

Accordingly, it is possible to reduce the sloshing due to fluctuation at sea, to appropriately support the load of the superstructure, and to increase the space for the arrangement of the superstructure and the storage capacity of the liquefied gas, Research on structures needs to continue.

In order to solve such conventional problems, the present invention is characterized in that, in disposing a plurality of storage tanks in a floating structure, a pipe capable of connecting a plurality of storage tanks to each other is installed and the liquefied gas is shipped and unloaded A loading and unloading device for a storage tank in which the manufacturing cost can be reduced by reducing the number of pump towers installed, and a floating structure having the loading and unloading device.

According to an aspect of the present invention, there is provided a floating structure for use in floating a floating structure, which is installed in a plurality of rows in a hull of a floating structure for loading or unloading liquefied gas into a storage tank for storing liquefied gas An apparatus for loading and unloading a storage tank, comprising: an internal pump installed in a storage tank of any one of storage tanks adjacent in a width direction; An external pump installed outside the storage tank; A plurality of storage tanks each extending in the longitudinal direction of the hull so as to pass through the storage tanks to connect between the storage tanks in which the internal pumps are not installed and the external pumps, An unloading line for discharging gas; A plurality of storage tanks, each of the storage tanks extending along a longitudinal direction of the hull to penetrate the storage tanks to connect the storage tanks in which the internal pumps are not installed, line; And a loading and unloading device for loading and unloading the storage tank.

The external pump is preferably installed in a pump chamber provided in a separate space outside the storage tank.

Wherein the unloading line includes a main loading line extending from the storage tanks through a lower portion of the storage tanks in which the internal pump is not installed and a plurality of pieces extending from the main loading line to a position adjacent to the bottom of the storage tank And a branching and unloading line of the branching line.

Wherein the loading line includes a main loading line extending through an upper portion of the storage tanks where the internal pump is not installed among the storage tanks and a plurality of loading units extending from the main loading line to a position adjacent to the bottom of the storage tank And a branch shipping line of the first line.

Preferably, the storage tank in which the internal pump is installed and the storage tank adjacent in the width direction are connected to each other so that the fluid can be moved by the connection passage.

It is preferable that a longitudinal direction copper dam installed longitudinally and a lateral direction copper dam installed in the width direction are provided in the inside of the hull of the floating structure and a plurality of the storage tanks are arranged in two rows inside the hull.

At this time, the internal pump is installed in the storage tank of the port side row or starboard side row among the storage tanks arranged in two rows, and the storage tank in which the internal pump is installed and the storage tank which is adjacent in the width direction, So that they can be moved.

The unloading line may include a main loading line extending through a lower portion of the storage tanks included in the row where the internal pump is not installed among the storage tanks of the port side column and the starboard side column.

Wherein the shipment line includes a main shipment line extending from the storage tanks of the port side column and the starboard side column so as to pass through the upper portion of the storage tanks included in the row where the internal pump is not installed, And a plurality of branch shipping lines extending to a location adjacent the bottom of the storage tank.

The main loading line may be connected to the loading line through the external pump.

And a support member protruding from the bottom of the storage tank for supporting the main loading line is installed in the storage tank.

And a support member extending from a ceiling of the storage tank to support the main shipping line is provided inside the storage tank.

The pipes constituting the loading line and the loading line may have a double pipe structure including an inner pipe and an outer pipe for preventing leakage of the liquefied gas.

According to another aspect of the present invention, there is provided a floating structure for use in floating at sea, comprising: a plurality of storage tanks installed to store liquefied gas inside a hull of the floating structure; A loading and unloading device installed to supply liquefied gas to the storage tank or to discharge the liquefied gas from the storage tank; Wherein the loading and unloading device comprises: an internal pump installed in one of the storage tanks adjacent in the width direction; an external pump installed outside the storage tank; To allow discharge of the liquefied gas contained in each of said storage tanks, extending along the longitudinal direction of said hull so as to pass through said storage tanks for connecting between the storage tank not provided with the pump and said external pump A supply line for supplying a liquefied gas to the inside of each of the storage tanks so as to extend along the longitudinal direction of the hull so as to pass through the storage tanks for connecting the storage tanks among the storage tanks in which the internal pumps are not installed, And a shipment line which enables the shipment line.

The floating structure includes a longitudinal direction copper dam installed in the longitudinal direction of the hull for dividing an inner space of the hull, a lateral direction copper dam installed in the width direction of the hull for dividing the inner space of the hull, Wherein a plurality of the storage tanks are arranged in two rows inside the hull by the longitudinal cofferdam and the width direction cofferdam, and the internal pumps are arranged in a row on the left side of the storage tanks arranged in two rows, The storage tank provided with the internal pump and the storage tank adjacent in the width direction may be connected to each other to enable fluid movement by the connection passage.

In the floating structure, it is preferable that the unloading line and the loading line extend through storage tanks included in the row of the storage tank of the port side column or the starboard side row in which the internal pump is not installed.

The floating structure is any one selected from the group consisting of LNG FPSO, LNG FSRU, LNG transport, and LNG RV, which is used in a floating state in the sea where a flow occurs while having a storage tank for storing liquid cargo to be loaded at a cryogenic temperature desirable.

According to the present invention as described above, a plurality of storage tanks are disposed inside a floating structure, and pipes for connecting a plurality of storage tanks to each other are installed. Through this piping, a storage capable of loading and unloading liquefied gas A loading and unloading device for the tank, and a loading and unloading device.

Accordingly, according to the loading and unloading apparatus of the present invention, it is possible to reduce the number of pump towers installed, thereby reducing the cost, time, and labor required for manufacturing and installing the pump towers.

Hereinafter, a loading and unloading apparatus for a storage tank and a floating structure having the loading and unloading apparatus according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present specification, the floating structure means a concept including both a marine plant and a ship which are used floating in the sea where a flow occurs while having a storage tank for storing a liquid cargo to be loaded at a cryogenic temperature like LNG, It includes both marine plants such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (Floating Storage and Regasification Unit) as well as vessels such as LNG transport or LNG RV (LNG Regasification Vessel).

Figure 1 shows a top view of the floating structure. In order to solve the sloshing problem, as shown in Fig. 1, instead of increasing the size of the storage tank, a structure such as a coffer dam or a partition wall may be provided in the space inside the hull of the floating structure in the longitudinal direction, It has been proposed that a plurality of storage tanks having a small capacity are installed as a result of arranging them in rows. 1, reference numeral 3 denotes a ballast tank, and reference numeral 5 denotes a pump tower.

According to the present invention, in the inside of the hull (1) of the floating structure, a longitudinal barrier structure (i.e., a longitudinal cofferdam or the like) and a lateral barrier structure That is, a width direction copper dam or the like).

The partition wall structure may be a cofferdam, a bulkhead, or the like, and a storage tank 10 is installed in each of the spaces defined by the partition wall structure. Since the inner space of each storage tank 10, in particular, the lengthwise length of the storage tank, is reduced by the barrier structure, the influence of the sloshing phenomenon of the stored liquefied gas can be reduced while the load of the upper structure can be supported.

In the present invention, the coffer dam is a lattice structure in which a void space is provided inside a copper dam (i.e., a bulkhead). The coffer dam is a lattice type structure in which the inner space of the floating floating structure is divided longitudinally and laterally, It is a structure that enables to install a membrane type storage tank. Such cofferdams have been used for partitioning a plurality of storage tanks along a longitudinal direction in conventional LNG carriers and the like.

The coffer dam can be largely divided into a longitudinal direction copper dam 20 and a width direction copper dam 30. The longitudinal direction cofferdam (30) is a structure for horizontally dividing the inner space of the hull of the floating structure so that the membrane type storage tank can be arranged along the longitudinal direction. The longitudinal direction copper dam (20) And a structure in which the membrane type storage tank can be arranged along the width direction by dividing the internal space vertically. The copper dam partition (i.e., bulkhead) of the longitudinal copper dam 30 can form the front wall portion and the rear wall portion of the storage tank, and the copper dam partition wall The left or right wall portion of the storage tank can be formed.

As described above, when a membrane-type storage tank is used as the liquefied gas storage tank, a barrier structure composed of the above-described coffer dam is used as a structure that bisects the internal space of the floating structure. In the case of a stand-alone storage tank, a simple partition may be used as a partition structure for bisecting the internal space of the floating structure, that is, the tank hold where the storage tank is located.

According to the present invention, a supporting column can be additionally installed inside the coffer dam when a membrane type storage tank is used so as to support the load of the superstructure, and when a stand-alone storage tank is used, Additional support columns can be installed. Alternatively, the shape or thickness of the partition may be modified to suit the load support of the upper structure.

As in the present invention, in the field of a liquefied gas storage tank for storing liquefied gas such as LNG, which is a liquid cargo at a cryogenic temperature, it is not possible to simply partition one storage tank by a partition in order to achieve a two- And the shape of the storage tank must be completely redesigned.

In the membrane type storage tank, the membrane structure (that is, the sealing wall structure) can not form a partition wall by itself. When a non-ferrous metal partition wall is installed in a conventional membrane type storage tank, . In addition, when non-ferrous metal bulkheads are to be installed inside a membrane-type storage tank, special design is to be taken considering the provision of bulkheads. In addition, the inside of the storage tank can not be made of a single membrane structure, and a discontinuous point is formed between the membrane structure and the partition wall, thereby damaging the connection portion with the partition wall or potentially reducing the adiabatic effect.

The inventors of the present invention have found that, in forming the two row arrangement structure by the membrane type storage tank, as shown in Fig. 1, the longitudinal coffer dam 20 extending in the longitudinal direction inside the hull of the floating structure, A two-row arrangement structure of the storage tanks in which two LNG storage tanks are arranged in the width direction inside the substantially floating structure are arranged along the longitudinal direction. Accordingly, according to the present invention, as viewed from the stern, storage tanks are arranged in two rows in the floating structure.

The storage tanks formed in two rows on both sides of the space portion between the storage tanks arranged in two rows are provided with a longitudinal direction cofferdam 20, A completely sealed and separate storage space can be secured.

As described above, according to the present invention, when the membrane type storage tank, the coffer dam, and another membrane type storage tank are arranged in a row in the lateral direction of the floating structure, The two-row arrangement structure can be formed by applying the manufacturing technology (the width direction cofferdam), and the middle longitudinal copper dam 20 also plays the role of supporting the load of the upper structure at the same time.

The present invention can be applied not only to the membrane type storage tank but also to the SPB type storage tank. When the present invention is applied to an SPB type storage tank, a partition wall may be simply provided inside the tank hold where the SPB type storage tank is disposed, or a COP dam may be provided as shown in FIG.

By arranging the storage tanks 10 in two rows, the impact force by the sloshing applied to the storage tank can be drastically reduced. Considering the results of the numerical analysis, it can be understood that the sloshing impact force is largely decreased for the following two reasons. First, the amount of stored cargo, that is, the amount of LNG is reduced, thereby reducing the impact force by sloshing. Second, as the width of the storage tank is reduced to more than half, the motion natural period of the liquid cargo, that is, the LNG, is separated from the natural period of the floating structure, so that the size of the motion of the liquid cargo becomes small.

Also, since the floating structure such as LNG FPSO increases the weight of the upper structure, a storage tank capable of withstanding such a heavy load is required. In the case of the storage tank 10 having the two row arrangement structure according to the present invention, The cofferdam can perform the role of supporting and dispersing the upper load by installing the longitudinal direction coffer dam 20 between the membrane type storage tanks 10 rather than simply dividing the tank into halves.

However, in the case where the inside of the hull structure of the floating structure is divided by a structure such as a cofferd dam or a bulkhead to arrange the liquefied gas storage tanks in two rows, one tank should be installed for each storage tank for loading and unloading liquefied gas There is a problem that the number of installed pump towers doubles.

In order to solve this problem, according to the present invention, a connection passage is formed between two storage tanks adjacent in the width direction among the storage tanks arranged in two rows, and only one of the storage tanks connected by this connection passage Install a pump tower. In addition, a pump is installed outside the storage tank, and loading and discharging lines for connecting the storage tanks extending from the external pump and having no pump tower in the longitudinal direction are installed.

According to the present invention, the number of pump towers is reduced by providing the loading and unloading apparatus configured as described above, thereby reducing the cost and time required for manufacturing the floating structure.

2 is a side cross-sectional view of a floating structure having a loading and unloading device according to a preferred embodiment of the present invention, and Fig. 3 is a top view of a floating structure having a loading and unloading device according to a preferred embodiment of the present invention A diagram for explaining the arrangement of the unloading lines is shown. 4 is a front sectional view of a floating structure having a loading and unloading apparatus according to a preferred embodiment of the present invention.

2 to 4, the loading and unloading apparatuses according to the preferred embodiment of the present invention are arranged such that they are adjacent to each other in the width direction among the storage tanks 10 arranged in two rows inside the hull 1 of the floating structure An internal pump 41a installed in one of the two storage tanks 10 connected by the connection passage 48, an external pump 41b installed outside the storage tank 10, An unloading line 44 for connecting the storage tanks 10 not provided with the pump 41a in the longitudinal direction and connected to the external pump 41b for discharging the liquefied gas stored in the storage tank, And a loading line 46 for connecting the storage tanks 10 not provided with the storage tanks 10 in the longitudinal direction and supplying liquefied gas to the respective storage tanks 10. [

As shown in Figs. 3 and 4, the internal pump 41a is installed in the storage tank installed on the port side of the storage tanks 10 arranged in two rows. In addition, the external pump 41b is preferably installed in a pump chamber 42 provided in a space separate from the storage tank 10. The internal pump 41a and the external pump 41b may be composed of one or more pumps, if necessary. In particular, it is desirable to additionally provide a spare pump for malfunction or failure of the pump.

The internal pump 41a may be a pump included in a conventional pump tower. As shown in FIG. 4, a pipe 43 corresponding to a pipe structure included in a conventional pump tower is installed in the internal pump 41a .

The liquefied gas contained in each of the storage tanks 10 is connected to the connection passage 48 through two connection pipes 48 between two storage tanks adjacent in the width direction among the storage tanks 10 disposed in two rows, It is possible to flow naturally. The flow through the connecting passage 48 does not have to be forced by a separate pump or the like.

The connection passage 48 is preferably installed close to the bottom of the storage tank 10 so that all the liquefied gas can flow between the two storage tanks 10. [

3 and 4, the loading line 44 and the loading line 46 are installed so as to penetrate the storage tanks installed on the starboard side in the longitudinal direction among the storage tanks 10 arranged in two rows. Although only the unloading line 44 is shown in Fig. 3, the unloading line 44 and the loading line 46 are installed to pass through the same storage tank 10, as shown in Fig.

Although the figure shows that the unloading line 44 and the loading line 46 are each formed by one pipe line, the unloading line 44 and the loading line 46 of each line are constituted by two or more pipe lines, can do. Although the figure shows that the internal pump 41a is installed in the port side storage tank and the loading line 44 and the loading line 46 are extended along the upstream row of the storage tank, It is also possible that it is installed in the starboard side storage tank and the loading line 44 and the loading line 46 extend along the port side row of the storage tank.

3 and 4, the unloading line 44 is connected to the storage tanks 10 along the longitudinal direction of the hull 1 along the starboard side row among the storage tanks 10 arranged in two rows. And a main loading line 44a provided so as to penetrate through the main loading line 44a.

An opening may be formed in the main loading line 44a or an opening may be formed in the main loading line 44a in order to supply the liquefied gas stored in each of the storage tanks 10 to the external pump 41b through the main loading line 44a. A branch unloading line 44b extending to near the floor can be formed. The main unloading line 44a is installed to pass through a plurality of storage tanks arranged in the longitudinal direction.

4, a support member 45 protruding from the bottom of the storage tank 10 may be installed to support the main unloading line 44a inside the storage tank 10. As shown in Fig.

Although one branch storage and unloading line 44b is shown as being installed in one storage tank 10, a plurality of branch loading and unloading lines 44b may be installed in one storage tank 10 as required .

According to the present invention, the liquefied gas contained in the storage tanks 10 included in the row of either of the storage tanks 10 arranged in two rows (exemplified as the star side in Figs. 3 and 4) Can be unloaded out of the hull (1) of the floating structure through the loading line (44) by the driving force of the pump (41b).

Further, according to the present invention, since the storage tanks 10 adjacent in the width direction are connected by the connection passage 48, the liquefied gas contained in the two storage tanks 10 adjacent to each other in the width direction passes through the internal pump 41a The hull 1 of the floating structure can be unloaded.

As described above, according to the present invention, the unloading operation of the storage tank can be performed using either or both of the internal pump 41a and the external pump 41b.

The discharge line extending from each of the pumps 41a and 41b to the outside of the hull 1 of the floating structure may have the same configuration as the discharge line used in the conventional LNG carrier or the like and is not specifically shown in the drawing.

2 and 4, the loading line 46 is installed similar to the loading line 44 described above, but the loading line 44 is provided in the lower portion of the storage tank 46 Is installed at the top of the storage tank. Although it is shown in the drawings that the loading line 44 and the loading line 46 are respectively disposed at the center lower portion and the center upper portion of the storage tank, none.

In other words, the shipping line 46 is a main ship (not shown) installed along the longitudinal direction of the hull 1 so as to pass through the storage tanks of the heat of either one of the storage tanks 10 arranged in two rows Line 46a and a branch shipping line 46b branched from the main shipping line 46a of each column and extending to the vicinity of the bottom of the storage tank 10 within each storage tank 10. [

The main shipping line 46a is installed to pass through a plurality of storage tanks arranged in the longitudinal direction.

A support member 47 extending from the ceiling of the storage tank 10 may be installed to support the main shipping line 46a inside the storage tank 10, as shown in Fig.

Although one branch storage line (46b) is shown as being installed in one storage tank (10), a plurality of branch shipping lines (46b) may be installed in one storage tank (10) have.

According to the present invention, in order to supply the liquefied gas to the storage tanks 10 included in the row of either of the storage tanks 10 arranged in two rows (exemplified as the star side in Figs. 3 and 4) The liquefied gas can be shipped from the outside of the floating structure to each of the storage tanks 10 through the shipping line 46 including the main shipping line 46a and the branch shipping line 46b.

According to the present invention, since the storage tanks 10 adjacent in the width direction are connected by the connection passage 48, the liquefied gas supplied to the two storage tanks 10 adjacent in the width direction is supplied to the internal pump 41a from the outside of the hull 1 of the floating structure.

As described above, according to the present invention, the loading operation of the storage tank can be performed using either or both of the loading line 46 and the pipe 43.

The main shipment line 46a may be connected to the external pump 41b so that the liquefied gas contained in any one of the plurality of storage tanks 10 is supplied to the load line 44, And transfer it to another storage tank through the loading line 46. Although the loading line 46 is shown connected to the loading line 44 via the pump 41 in Figure 2, the loading line 44 and the loading line 46 may be modified such that they are not connected to each other Of course.

The supply line extending from the outside of the hull 1 of the floating structure to the shipping line 46 or the piping 43 may have the same constitution as the supply line used in the conventional LNG carrier or the like, I do not.

5 is a partial cross-sectional view showing a portion where the loading line and the unloading line included in the loading and unloading apparatus of the present invention are combined with the sealing wall and the insulating wall of the storage tank.

As shown in FIG. 5, the pipes constituting the shipping line and the unloading line may have a double pipe structure including an inner pipe 61 and an outer pipe 62 to prevent leakage of the liquefied gas. However, the pipe in the section passing through the inside of the storage tank 10 and the pipe extending in the outside of the hull need not necessarily have a double pipe structure.

The inner pipe (61) and the outer pipe (62) are spaced apart from each other, and the space between the inner pipe (61) and the outer pipe (62) can be filled with the heat insulating material. In addition, if necessary, a separate heat insulating material may be provided outside the outer tube 62. The pipe extending from the outside of the storage tank 10 may be any insulation and sealing technique which can be applied to a known membrane tank or a stand-alone tank.

A pipe is installed in a liquid-tight state in a liquefied gas storage tank 10 having a membrane structure composed of a primary sealing wall 11, a primary insulating wall 12, a secondary sealing wall 13 and a secondary insulating wall 14 The first to third extension portions 62a, 62b and 62c may be formed to protrude from the outer pipe 62 of the pipe. The first extending portion 62a is attached to the primary sealing wall 11 of the liquefied gas storage tank 10 by welding or the like and the second extending portion 62b is attached to the primary sealing wall 11 of the liquefied gas storage tank 10 by the secondary sealing Is attached to the wall 13 and the third extension 62c is attached to the hull bulkhead (i.e., bulkhead or hull) 15 of the liquefied gas storage tank 10.

Although not shown, the loading line 44 and the loading line 46 are provided with an appropriate number of valves, as required, so as to control the flow of the liquefied gas.

As described above, according to the preferred embodiment of the present invention, even when the longitudinal direction coffer dam is provided so that the internal space of the floating floating structure is divided so that the liquefied gas storage tanks are arranged in two rows, It is not necessary to separately install pump towers for discharging or supplying from outside. Accordingly, the manufacturing cost of the floating structure can be reduced and the operation and management can be facilitated.

In the above-described embodiment, the storage tanks are arranged in two rows in the floating structure. However, the present invention can be applied to the case where the storage tanks are arranged in one row or the storage tanks are arranged in three rows or more Of course.

Although the present invention is applied to the membrane type storage tank, particularly the GTT NO 96 type storage tank, the present invention can be applied to the Mark III type storage tank or the independent type storage tank.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, It will be apparent to those skilled in the art that various modifications and changes may be made.

FIG. 1 is a plan view of a floating structure having storage tanks arranged in two rows, FIG.

2 is a side cross-sectional view of a floating structure having a loading and unloading device according to a preferred embodiment of the present invention;

3 is a plan view of a floating structure having a loading and unloading apparatus according to a preferred embodiment of the present invention,

4 is a front section view of a floating structure having a loading and unloading apparatus according to a preferred embodiment of the present invention, and

5 is a partial cross-sectional view illustrating a portion where the loading line and the unloading line included in the loading and unloading apparatus of the present invention are combined with the sealing wall and the insulating wall of the storage tank.

Description of the Related Art

1: Hull 10: Storage tank

11: Primary sealing wall 12: Primary insulating wall

13: secondary sealing wall 14: secondary insulation wall

15: Hull bulkhead 20: Longitudinal direction copper dam

30: width direction coffer dam 41a: internal pump

41b: external pump 42: pump chamber

43: piping 44: unloading line

44a: main unloading line 44b: branch unloading line

45: support member 46: shipping line

46a: main shipping line 46b: branch shipping line

47: support member 48: connection passage

61: inner tube 62: outer tube

62a: first extension part 62b: second extension part

62c: third extension portion

Claims (17)

A loading and unloading apparatus for a storage tank for loading or unloading a liquefied gas into a storage tank for storing liquefied gas, which is installed in a plurality of rows inside a hull of a floating structure used floating in the sea, An internal pump installed in one of the storage tanks adjacent in the width direction; An external pump installed outside the storage tank; A plurality of storage tanks each extending in the longitudinal direction of the hull so as to pass through the storage tanks to connect between the storage tanks in which the internal pumps are not installed and the external pumps, An unloading line for discharging gas; A plurality of storage tanks, each of the storage tanks extending along a longitudinal direction of the hull to penetrate the storage tanks to connect the storage tanks in which the internal pumps are not installed, line; / RTI > The storage tank in which the internal pump is installed and the storage tank adjacent in the width direction are connected to each other to enable fluid movement by the connection passage, Wherein the connecting passage is installed at the bottom of the storage tank so that all the fluid can flow naturally between the storage tanks. The method according to claim 1, Wherein the external pump is installed in a pump chamber provided in a separate space outside the storage tank. The method according to claim 1, Wherein the unloading line includes a main loading line extending from the storage tanks through a lower portion of the storage tanks in which the internal pump is not installed and a plurality of pieces extending from the main loading line to a position adjacent to the bottom of the storage tank And a branch unloading line of the storage tank. The method according to claim 1, Wherein the loading line includes a main loading line extending through an upper portion of the storage tanks where the internal pump is not installed among the storage tanks and a plurality of loading units extending from the main loading line to a position adjacent to the bottom of the storage tank And a branch shipping line of the storage tank. delete The method according to claim 1, Wherein a longitudinal cofferdam installed in a length direction and a width direction cofferdam installed in a width direction are provided inside the hull of the floating structure and a plurality of the storage tanks are arranged in two rows inside the hull. Loading and unloading equipment for tanks. The method of claim 6, The internal pump is installed in the storage tank of the port side row or starboard side row among the storage tanks arranged in two rows. The storage tank in which the internal pump is installed and the storage tank adjacent in the width direction are moved Wherein the storage tanks are connected to each other to enable the storage tank to be loaded and unloaded. The method of claim 7, Wherein the unloading line includes a main loading line extending through a lower portion of the storage tanks included in the row where the internal pump is not installed among the storage tanks of the left side column and the star side row. Loading and unloading devices. The method of claim 7, Wherein the shipment line includes a main shipment line extending from the storage tanks of the port side column and the starboard side column so as to pass through the upper portion of the storage tanks included in the row where the internal pump is not installed, And a plurality of branch shipping lines extending to a location adjacent the bottom of the storage tank. The method according to claim 4 or 9, And the main loading line can be connected to the loading line through the external pump. The method according to claim 3 or 8, And a supporting member protruding from the bottom of the storage tank for supporting the main loading line is installed in the storage tank. The method according to claim 4 or 9, And a support member extending from a ceiling of the storage tank for supporting the main loading line is installed inside the storage tank. The method according to claim 1, Wherein the pipes constituting the loading line and the loading line have a double pipe structure including an inner pipe and an outer pipe for preventing leakage of the liquefied gas. Floating structures used floating in the sea, A plurality of storage tanks installed to store the liquefied gas inside the hull of the floating structure; A loading and unloading device installed to supply liquefied gas to the storage tank or to discharge the liquefied gas from the storage tank; / RTI > The loading and unloading device, An inner pump installed in one of the storage tanks adjacent to each other in the width direction, an outer pump installed outside the storage tank, and a storage tank in which the inner pump is not installed, A loading line extending along the longitudinal direction of the hull so as to pass through the storage tanks for connecting between the pumps and allowing discharge of the liquefied gas contained in each of the storage tanks; And a loading line extending along the longitudinal direction of the hull so as to penetrate the storage tanks to connect the storage tanks without an internal pump to enable supply of the liquefied gas into each of the storage tanks, The storage tank in which the internal pump is installed and the storage tank adjacent in the width direction are connected to each other to enable fluid movement by the connection passage, Wherein the connecting passage is installed at the bottom of the storage tank so that all fluid can naturally flow between the storage tanks. 15. The method of claim 14, The floating structure includes a longitudinal direction copper dam installed in the longitudinal direction of the hull for dividing an inner space of the hull, a lateral direction copper dam installed in the width direction of the hull for dividing an inner space of the hull, / RTI > Wherein the plurality of storage tanks are arranged in two rows inside the hull by the longitudinal coffer dam and the width direction cofferdam, Wherein the internal pump is installed in the storage tank of the port side row or the starboard side row among the storage tanks arranged in two rows. 16. The method of claim 15, Wherein the loading line and the loading line are extended through storage tanks included in a row of the storage tank of the port side column or the starboard side row in which the internal pump is not installed. 15. The method of claim 14, The floating structure may be any one selected from the group consisting of LNG FPSO, LNG FSRU, LNG carrier, and LNG RV, which is used in a floating state in the sea where a flow occurs while having a storage tank for storing the liquid cargo to be loaded at a cryogenic temperature Floating structure characterized by.

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