KR20100110171A - A liquified gas carrier and the building method thereof - Google Patents

Abstract

PURPOSE: A liquefied gas carrier and a building method thereof are provided to implement a simple structure of flow path through which leaked liquefied gas is collected. CONSTITUTION: A liquefied gas carrier comprises an exterior wall(24), an insulation part(30), a plurality of panels(42), and a support part(44). The exterior wall forms an outer shape of a cargo space accommodating liquefied gas. The insulation part is installed to block the heat transfer between the interior and exterior of the cargo space by surrounding the exterior wall. The panels are installed between the exterior wall and the insulation part. The support part supports the panels between the adjacent panels to be separate from the exterior wall so that liquefied gas leaking outside the exterior wall flows down along the exterior wall. The insulation part comprises an insulation layer which a heat insulating foam material is spread.

Description

Liquefied gas carrier and its building method

The present invention relates to a liquefied gas carrier and a drying method thereof, and more particularly, to form a gap between the outer wall and the insulator of the cargo hold so that the leaked liquefied gas flows down the outer wall to be safely recovered from the lower portion of the cargo hold (partially). Liquefied gas carrier ship and its drying method.

Insulated cargo holds are generally used to store or transport fluids such as liquefied natural gas (LNG), liquefied ammonia, liquefied petroleum gas (LPG), ethylene, crude oil, low temperature liquids, cryogenic liquids, and the like. Wrapped with thick insulation to keep the contained fluid in the desired phase, it is designed to withstand the load and physicochemical action of the contained fluid.

These insulation cargo holds are applied to ships carrying liquefied gas cargoes such as LNG carriers, LNG-RV carriers, LPG carriers, ETHYLENE carriers, and offshore floating facilities that store, produce or vaporize liquefied gas cargoes such as FSRU and FPSO. .

However, when the cargo hold for the liquefied gas is broken and the liquefied gas leaks out, surrounding facilities that are not durable to cryogenic temperatures may be damaged together. In addition, if liquefied gas leaks from the cargo hold of the liquefied gas carrier, it may cause fatal damage to the hull. Therefore, it is necessary to dry the hull adjacent to the cargo hold with a heat-resistant material or to have a structure capable of safely recovering the leaked liquefied gas. .

The formation of complete secondary barriers by forming adjacent hull inner walls, as well as cargo holds, with heat-resistant materials leads to an increase in costs associated with the use of expensive materials. 163 ° C.) is difficult to apply.

On the other hand, in the case of a structure for recovering leaked liquefied gas (partially secondary barrier) instead of forming a completely secondary barrier, a predetermined flow path may be formed between the cargo hold outer wall and the heat insulating material to allow the leaked liquefied gas to flow. It must be collected at the bottom, which is necessary to secure the flow path with low cost and simple configuration.

In particular, there is a need for a structure capable of securing a path through which liquefied gas can flow even when forming an insulating layer by spraying a bubble insulating material (when spray insulation is applied).

The present invention relates to a liquefied gas carrier that can be safely recovered from the bottom of the cargo hold again by forming a gap between the outer wall and the insulation of the cargo hold so that the leaked liquefied gas flows along the outer wall and a drying method thereof.

The present invention provides an outer wall forming an outer shape of a cargo hold for liquefied gas, a heat insulating part installed to surround the outer wall while blocking heat conduction between the inside and the outside of the cargo hold, and a plurality of insulating parts provided between the outer wall and the insulating part. A panel and a supporting part for supporting the panel between neighboring panels to allow the liquefied gas to flow along the outer wall when the liquefied gas leaks outside the outer wall, and spaced apart from the panel and the outer wall by a predetermined distance. Provide liquefied gas carriers.

Here, the heat insulating part may include a heat insulating layer formed by spraying the bubble insulation.

The apparatus may further include a drip tray provided below the cargo hold to accommodate the leaked liquefied gas, and a discharge passage guiding the leaked liquefied gas to the drip tray.

And, provided on the support portion, may further include an inclined portion for guiding the leaked liquefied gas to the discharge passage.

On the other hand, the drying method of the liquefied gas carrier according to the present invention is the step of assembling the outer wall of the cargo hold, the step of installing the supporting portion at predetermined intervals outside the outer wall, and the adjacent panels are installed so as to span both ends of the supporting portion And forming a predetermined gap between the outer wall and the panel, and installing a heat insulating part to surround the panel and the support part to block heat conduction between the inside and the outside of the cargo hold.

Here, the step of installing the heat insulating part may include the step of forming a heat insulating layer by spraying the bubble insulating material, it may be further provided a step of installing a drip tray provided in the lower cargo container to receive the leaked liquefied gas. .

According to the liquefied gas carrier and the drying method according to the present invention has the following effects.

First, since the flow path through which leaked liquefied gas is recovered can be implemented with a simple structure, the manufacturing process can be reduced and the cost can be reduced.

Second, it is possible to prevent the breakage of the hull by the leaked liquefied gas to prevent safety accidents during operation of the liquefied gas carrier and to ensure the reliability of the ship.

Third, even when the insulating layer is formed by spraying the bubble insulation, it is possible to secure the flow path of the leaked liquefied gas can significantly shorten the drying days of the ship.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosure may be made thorough and complete, and to fully convey the spirit of the present invention to those skilled in the art. Like numbers refer to like elements throughout.

1 is a sectional view of a liquefied gas carrier according to the present invention, Figure 2 is a partially cutaway perspective view of a cargo hold of the liquefied gas carrier according to the present invention, Figure 3 is a cross-sectional view showing an enlarged portion A of FIG. It is also. 4 is a cross-sectional view illustrating a drip tray (partial secondary barrier) structure of a liquefied gas carrier according to the present invention, and FIG. 5 is a configuration diagram illustrating a liquefied gas flow path of the liquefied gas carrier according to the present invention.

1 to 5, the liquefied gas carrier ship 10 according to the present invention may be partitioned into a plurality of spaces by the partition wall 16 inside the hull 12. The cargo hold 20 is provided in the space, but the cargo hold 20 may be dried together with the hull 12, but may be separately mounted from the hull 12 and then mounted on the hull 12. The upper portion of the cargo hold 20 is disposed below the deck 14 of the liquefied gas carrier (10).

The cargo hold 20 may be supported by a plurality of supports 22 having a lower portion of the outer wall 24 on the bottom plate 18, in which case the cargo hold 20 and the liquefied gas contained in the cargo hold 20 are provided. The load acts on the support 22. In this case, the support 22 may include a heat insulator to prevent heat transfer to the hull 12. In addition, the support 22 may be slidably installed in a predetermined section so as to absorb the thermal expansion and contraction of the cargo hold 20.

On the other hand, the liquefied gas carrier ship 10 according to the present invention is the outer wall 24 to form the outer shape of the cargo hold 20 to accommodate the liquefied gas and the outer wall of the cargo hold 20 to block the heat conduction between the outside A heat insulating part 30 provided to surround the 24, a plurality of panels 42 provided between the outer wall 24 and the heat insulating part 30, and the liquefied gas leaks out of the outer wall 24. When the liquefied gas flows along the outer wall (24) to support the panel 42 between the adjacent panel 42 so as to space the panel 42 and the outer wall a predetermined interval ( 44).

The outer wall 24 is preferably made of a heat resistant material, for example, an aluminum alloy, stainless steel, nickel steel, or the like may be used. The outer wall 24 functions as a primary barrier to prevent the low temperature liquefied gas from affecting the hull 12. In addition, a reinforcing material 26 may be installed on the lower surface of the outer wall 24.

Here, the heat insulating portion 30 is applied around the outer wall 24 to block heat conduction. The heat insulating part 30 may be composed of a plurality of prefabricated heat insulating panels fixedly attached to the outer wall surface, in which case the heat insulating panels are interconnected by a flexible cushion joint, and the outer wall (stud) by the stud (stud) 24). In this case, the insulation panel is preferably made of polyurethane (Poly-urethane Foam, PUF).

However, in the case of applying the heat insulation panel as described above, since each heat insulation panel must be fixed to and interconnected with the outer wall 24, there is a disadvantage in that the number of working days increases and accordingly the number of drying days increases.

Therefore, in forming the heat insulating part 30, it is preferable to apply a method of forming a heat insulating layer by spraying the heat insulating material on the outer wall 24 outside by a spray method. That is, the heat insulating part 30 is made of a heat insulating layer formed by spraying the bubble insulation. In this case, the foam insulation material may include a polyurethane material.

On the other hand, prior to forming the heat insulating portion 30, it is preferable that a plurality of panels 42 are provided at positions spaced apart from the outside of the outer wall 24 by a predetermined interval. The panels 42 are spaced apart from the outer wall 24 by a predetermined interval, thereby forming a gap between the outer wall 24 and the heat insulating part 30. This causes the outer wall 24, which serves as a primary barrier, to be broken or cracked, so that the contained liquefied gas leaks and flows along the outer wall 24 to collect it at a predetermined position under the cargo hold 20. This is to prevent direct damage to the hull 12.

The inner wall 12 of the hull 12 adjacent to the cargo hold 20 may be made of a heat resistant material so as not to be deformed or damaged even when exposed to cryogenic temperature, but this is disadvantageous in terms of cost or processing, and thus, part 2 for recovering and collecting liquefied gas leaked. It is preferable to comprise in a vehicle barrier system. Therefore, it is important to secure a flow path through which the liquefied gas leaked between the outer wall 24 and the heat insulating part 30 can flow.

Here, the panel 42 may be supported at a position spaced apart from the outer wall 24 by the support 44. That is, the support 44 is located between the panels 42 adjacent to each other, and the panels 42 have a predetermined height from the outer wall 24 by each end facing each other over the support 44. Supported to be positioned above.

In this case, the support 44 may be installed on the outer wall 24 by a predetermined adhesive or a fastening member, or may be attached by welding. In addition, the panel 42 may be fixed to the support 44 by the same method.

As shown in FIG. 2, the longitudinal direction of the supporting part 44 is arranged to be parallel to the longitudinal direction of the cargo hold 20 (the direction corresponding to the longitudinal direction of the liquefied gas carrier), and the panel 42 and the supporting part. The portions 44 are arranged alternately along the direction from the upper portion of the cargo hold 20 to the transverse wall to form a gap between the panel 42 and the outer wall 24. This pattern is also repeated along the longitudinal direction of the cargo hold 20.

Here, the longitudinal direction of the support 44 is arranged so as to be perpendicular to the longitudinal direction of the cargo hold 20 and the panel 42 and the support 44 are configured to be alternately arranged along the longitudinal direction of the cargo hold. It is also possible.

On the other hand, the liquefied gas carrier ship 10 according to the present invention is provided in the lower cargo hold 20, the drip tray 50 for receiving the leaked liquefied gas, and the leaked liquefied gas to the drip tray 50 It may be made by further comprising a discharge passage 28 for guiding.

The drip tray 50 is preferably supported by the heat insulating member 52 on the bottom plate 18, to insulate the hull 12 and the liquefied gas contained on the drip tray 50.

The drip tray 50 is located below the cargo hold 20 and may be specifically installed below the valve 54 installed at the end of the discharge passage 28. The valve 54 may be configured to be opened and closed by thermal deformation of a metal plate. When the leaked liquefied gas is guided to the valve 54 through the discharge passage 28, the valve 54 is opened to liquefied gas. Is collected in the drip tray 50.

The discharge passage 28 may be formed by various methods such as recessing a portion of the outer wall 24 to a predetermined depth. The discharge passage 28 may be formed along the outer wall 24, and a plurality of discharge passages 28 may be configured to communicate with the valve 54. The valve 54 may also be installed at a plurality of points on the lower surface of the cargo hold 20, in which case the drip tray 50 is installed below each valve 54.

On the other hand, as shown in Figure 5, the support 44 may include a slope (S) for guiding the leaked liquefied gas to the discharge passage (28). The inclined portion S is formed to be inclined downward toward the discharge passage 28. By providing the inclined portion S as described above, even if a crack occurs at any point of the outer wall 24, the leaked liquefied gas is guided along the inclined portion S to the discharge passage 28, and the discharge passage 28 is provided. Flow along and may be collected in the drip tray 50 via the valve 54.

Looking at the drying method of the liquefied gas carrier 10 configured as described above is as follows.

First, the drying method of the liquefied gas carrier ship 10 according to the present invention comprises the steps of assembling the cargo hold outer wall 24, the step of installing the support 44 at predetermined intervals outside the outer wall 24, neighboring each other The panel 42 is installed so as to span both ends of the support 44 to form a predetermined gap between the outer wall 24 and the panel 42 and the heat conduction between the interior and exterior of the cargo hold 20 It may be made to include a step of installing the heat insulating portion 30 to surround the panel 42 and the support 44 to block the.

Here, the step of assembling the cargo hold outer wall 24 may be configured to assemble the cargo hold outer wall 24 after installing the support 44 and the panel 42 for each part such as the upper wall, the side wall, the lower wall. . That is, the supporting portion 44 and the panel 42 may be installed after the outer wall 24 is assembled, but also the assembly of the outer wall 24 after the supporting portion 44 and the panel 42 is installed for each part. It is possible.

On the other hand, as described above, the heat insulating portion 30 is preferably sprayed with a polyurethane foam insulation to form a heat insulating layer.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art to various modifications and changes to the present invention without departing from the spirit and scope of the invention described in the claims described below You can do it. It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

1 is a configuration view from the side of the liquefied gas carrier according to the present invention

2 is a partially cutaway perspective view of a cargo hold of a liquefied gas carrier according to the present invention

3 is an enlarged cross-sectional view of a portion A of FIG.

Figure 4 is a cross-sectional view showing the drip tray structure of the liquefied gas carrier according to the present invention

5 is a block diagram showing a liquefied gas flow path of the liquefied gas carrier according to the present invention

** Description of symbols for the main parts of the drawing **

10: liquefied gas carrier 12: hull

16: bulkhead 18: bottom plate

20: cargo hold 22: support

24: outer wall 26: reinforcement

28: discharge passage 30: heat insulation

42: panel 44: support

50: drip tray 52: insulation member

54 valve S: inclined portion

Claims (7)

An outer wall forming an outer shape of a cargo hold containing liquefied gas; A heat insulating part which blocks heat conduction between the inside and the outside of the cargo hold and surrounds the outer wall; A plurality of panels provided between the outer wall and the heat insulating part; Liquefied gas carrier ship including a support for separating the panel and the outer wall by supporting the panel between neighboring panels to allow the liquefied gas to flow along the outer wall when the liquefied gas leaks outside the outer wall . The method of claim 1, The heat insulating part liquefied gas carrier ship including a heat insulating layer is formed by spraying the bubble insulation. The method of claim 1, A drip tray provided below the cargo hold to accommodate the leaked liquefied gas; And Liquefied gas carrier ship further comprises a discharge passage for guiding the leaked liquefied gas to the drip tray. The method of claim 3, wherein The liquefied gas carrier ship is provided on the receiving portion, further comprising a slope for guiding the leaked liquefied gas to the discharge passage. Assembling the outer wall of the cargo hold; Installing a support unit at predetermined intervals outside the outer wall; Neighboring panels installed on both ends of the support part to form a predetermined gap between the outer wall and the panel; and And installing a heat insulating part to surround the panel and the supporting part to block heat conduction between the inside and the outside of the cargo hold. The method of claim 5, The step of installing the heat insulating part is a drying method of a liquefied gas carrier ship comprising the step of forming a heat insulating layer by spraying bubble insulation. The method of claim 5, And installing a drip tray provided under the cargo hold to receive the leaked liquefied gas.

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