KR20110000877U - Apparatus for collecting leakage of an independence type storage tank - Google Patents

Abstract

This design makes it possible to safely collect the liquid liquefied gas leaked from the standalone storage tank into the collection container while preventing the leaked liquid from leaking again from the collection container. It relates to a collecting device.

According to the present invention, it is installed in an offshore structure to be used floating in the sea as a leakage liquid collecting device of a standalone storage tank for storing liquefied gas, installed between the tank body of the standalone storage tank and the bottom of the hull of the offshore structure A collection container for containing the leaked liquid; Guide means extending from the gap between the insulating panel attached to the outside of the tank body and the tank body to the inside of the collection container to guide the leaking liquid to the collection container; Provided is a leaking liquid collection device of a stand-alone storage tank comprising a.

Liquefied Gas, Storage Tank, Standalone, Leakage, Tray, Pipe, Guide

Description

Leakage collection device of independent storage tank {APPARATUS FOR COLLECTING LEAKAGE OF AN INDEPENDENCE TYPE STORAGE TANK}

The present invention relates to a leaking liquid collecting device of a stand-alone storage tank installed for storing LNG or LPG, more specifically, a collection container of liquid liquefied gas leaked when the liquefied gas leaks from the stand-alone storage tank The present invention relates to a leaking liquid collecting device that can safely collect in a container and prevent the leaked liquid from leaking again from the collecting container.

Natural gas is transported in a gaseous state through onshore or offshore gas piping, or transported to a distant consumer while being stored in an LNG carrier in the form of liquefied liquefied natural gas (LNG) or liquefied petroleum gas (LPG). Liquefied natural gas is obtained by cooling natural gas to cryogenic temperature (approximately -163 ℃), and its volume is reduced to about 1/600 than natural gas in gas state, so it is very suitable for long distance transportation through sea.

LNG transporter for loading and unloading LNG to land requirements by operating the sea with LNG, or LNG RV (Regasification) that reloads LNG after unloading the sea with LNG for recharging the stored LNG The vessel includes a storage tank (commonly referred to as a cargo hold) that can withstand the cryogenic temperatures of liquefied natural gas.

Recently, there is a growing demand for plants such as LNG Floating, Production, Storage and Offloading (FPSO) or LNG Floating Storage and Regasification Units (FSRUs), which also include storage tanks installed on LNG carriers or LNG RVs. do.

LNG FPSO is a plant used for refining mined natural gas and then liquefying it directly in a storage tank and transporting LNG stored in the storage tank to an LNG carrier if necessary. In addition, the LNG FSRU is a plant that stores LNG stored in cargo tanks unloaded from LNG carriers at a distance far from the land, and then vaporizes LNG as needed to supply land demands, thereby eliminating onshore storage and production facilities.

As described above, a storage tank for storing LNG in a cryogenic state is installed in a vessel such as an LNG carrier, an LNG RV or the like that transports or stores a liquid cargo such as LNG, or a plant such as an LNG FPSO or an LNG FSRU. In the present specification, all of these vessels and plants are collectively referred to as offshore structures.

These storage tanks can be classified into independent type and membrane type depending on whether the load directly affects the insulation material.Membrane type storage tanks are usually GT NO 96 type and TGZ Mark III type. Independent storage tanks are divided into MOSS type and SPB type. The structure of the MOSS type independent storage tank is described in Korean Patent No. 10-15063 and the like, and the structure of the SPB type independent storage tank is described in Korean Patent No. 10-305513 and the like.

In general, stand-alone storage tanks are made by attaching a relatively rigid insulation panel such as polyurethane to a tank body made of aluminum alloy, SUS, and 9% nickel, such as low temperature resistant alloy, and arranged on the inner bottom of the hull. Is placed on the support.

These stand-alone storage tanks are equipped with drip trays to safely store leaked liquefied gas in order to prevent the leaked low temperature liquefied gas from coming into contact with the hull if the tank body is damaged and leaks. .

1 schematically shows the hull protection system of a standalone storage tank comprising a drip tray according to the prior art. As shown in FIG. 1, a conventional independent storage tank used in an offshore structure is formed by attaching an insulation panel 2 to the outside of the tank body 1.

At this time, the space between the tank body (1) and the heat insulating panel (2) is not closely contacted with each other to form a gap (3), and also between the one heat insulating panel (2) and another heat insulating panel (2) 3) are spaced apart from each other to form. These gaps 3, that is, the gap 3 between the tank body 1 and the insulation panel 2 and the gap 3 between the insulation panels 2, leak due to damage of the tank body 1. It can be utilized as a passage of the leaking liquid when it occurs.

When a leak occurs, the leak liquid flows through the gap 3 and falls into the drip tray 5 through a leak hole 4 installed in the lower portion of the insulation panel 2. The drip tray 5 is a substantially dish-shaped member made to accommodate leaking liquid, ie, liquefied gas, inside.

The drip tray 5 is disposed on the hull bottom 6 of the offshore structure via a support 7, which is insulated to prevent heat transfer between the drip tray 5 and the hull bottom 6. It is made of possible materials.

However, in the offshore structure, various movements are inevitable due to sea conditions such as waves, tides, and wind. Accordingly, when the offshore structure is severely moved, the leaking liquid falling from the leaking outlet 4 is drip tray 5. If the leakage liquid contained in the drip tray 5 overflows to the outside or overflows, the hull bottom 6 may be exposed to the low temperature leakage liquid.

Since the hull bottom 6 is not made in consideration of thermal deformation due to cryogenic liquefied gas, when the leaked liquefied gas falls directly onto the hull bottom 6, the hull bottom 6 causes thermal deformation or brittleness. The risk of becoming larger and larger may increase.

Therefore, in the prior art, the hull shield layer 8 is entirely laminated to the hull bottom 6. In the case of the independent tank TYPE A, the hull hull is composed of a secondary barrier, and the hull protection layer may be omitted. In the case of the independent tank TYPE B, the drip tray is composed of the secondary barrier. A protective layer is essential.

When the hull protective layer 8 is installed, there are many limitations in the construction and maintenance of offshore structures, and the material cost and labor cost increase because the hull protective layer 8 must be installed throughout the hull bottom 6. Due to the increase in the drying cost of the marine structure and there is a problem that takes a lot of drying time.

The present invention to solve the above-described problems, when the liquefied gas leaks from the stand-alone storage tank, it is possible to safely collect the leaked liquid liquefied gas to the collection container and at the same time the collected leakage liquid from the collection container It is an object of the present invention to provide a leaking liquid collecting device that can prevent leakage.

According to the present invention for achieving the above object, as a leakage liquid collection device of the independent storage tank for storing the liquefied gas is installed in the marine structure used floating in the sea, the tank body and the marine structure of the independent storage tank A collection vessel installed between the bottom of the hull and accommodating the leakage liquid; Guide means extending from the gap between the insulating panel attached to the outside of the tank body and the tank body to the inside of the collection container to guide the leaking liquid to the collection container; Provided is a leaking liquid collection device of a stand-alone storage tank comprising a.

Preferably, the collection container has a cylindrical shape and an opening is formed in an upper surface thereof to communicate the inside and the outside of the collection container.

Preferably, the area of the opening is smaller than the total area of the upper surface.

The collection container preferably has a rectangular parallelepiped shape in which each side is upright, and an opening through which the guide means can be inserted is formed in the upper surface of the collection container.

The upper side of each side of the collection vessel is preferably inclined to have a chamfer shape.

The lower end of the guide means is located in the collection container, it is preferable that the lower end of the guide means is located lower than the upper surface of the collection container so that the leaking liquid guided through the guide means can be collected inside the collection container. Do.

Insulating panel is attached to the outside of the tank body to form a heat insulating layer, the guide means is preferably installed through the heat insulating layer.

The upper end of the guide means is preferably located between the lower surface of the tank body and the upper surface of the insulation panel.

The upper end of the guide means is preferably located on the same plane as the upper surface of the insulation panel.

In normal times, where the liquefied gas does not leak, it is preferable to close the guide means by a closing means that decomposes or deforms when it comes in contact with the liquefied gas.

In addition, according to another aspect of the present invention, is installed in a marine structure that is used floating in the sea as a leaking liquid collection device of the independent storage tank for storing the liquefied gas, containing the leakage liquid leaked from the independent storage tank A collection vessel to be made; A pipe extending from the standalone storage tank to the collection container to guide the leakage liquid to the collection container; Includes, the upper surface of the collection vessel is provided with a leakage liquid collecting device of the independent storage tank, characterized in that the opening having a size larger than the cross-sectional area of the pipe and smaller than the total area of the upper surface of the collection vessel is provided. do.

According to the present invention as described above, when the liquefied gas leaks from the stand-alone storage tank, it is possible to safely collect the leaked liquid liquefied gas in the collection container and at the same time that the collected leakage liquid leaks from the collection container again. A leaking liquid collection device may be provided that can be prevented.

According to the leak liquid collection apparatus of the present invention, even if the hull movement is excessive, the leakage liquid can immediately fall into the collection container, the leakage liquid once contained in the collection container can be stored in the collection container surely.

Accordingly, it is possible to more stably protect the hull in case of leakage caused by damage to the stand-alone storage tank.

Hereinafter, a leak liquid collecting device of a standalone storage tank according to a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 2 shows a leak liquid collecting device of a stand-alone storage tank according to a first preferred embodiment of the present invention, and FIG. 3 shows a partial plan view of the leak liquid collecting device of FIG. 2.

As shown in Fig. 2 and 3, the leakage liquid collecting device of the independent storage tank according to the first preferred embodiment of the present invention, is installed on the hull bottom 6 and leaked from the tank body 1 That is, as a leaking liquid guide means installed to extend from the gap 3 between the tank body 1 and the heat insulation panel 2 to the interior of the collection container 11 and the collection container 11 for collecting liquefied gas. Pipe 13.

The independent storage tank is formed by forming a heat insulating layer by attaching a relatively hard heat insulating panel 2 like polyurethane foam to the outside of the tank body 1 as in the related art. The tank body 1 and the heat insulation panel 2 are spaced apart from each other so that a gap 3 is formed without being completely in contact with each other. The gap 3 between the tank body 1 and the heat insulation panel 2 can be utilized as a passage of the leaking liquid in the event of a leak due to damage of the tank body 1.

The collection container 11 is a leaking liquid storage container having a substantially rectangular cylinder shape in which the inside and the outside of the collection container can communicate only through the opening 11a formed on the upper surface. The opening is formed only in a part of the upper surface such that the area of the opening is larger than the cross-sectional area of the pipe 13 and smaller than the total area of the upper surface.

  The number of installations, the installation position and the size of the collection container 11 may vary depending on the size of the independent storage tank.

2 and 3, the collection container 11 according to the first embodiment of the present invention is formed so that the upper side of each side is inclined at a predetermined angle to have a chamfer shape, in the center of the upper surface The opening 11a is formed.

Through this opening 11a, the pipe 13 may extend to the inside of the collection container 11. That is, the lower end of the pipe 13 is located below the upper surface of the collecting container 11 so that the liquefied gas leaking liquid guided through the inside of the pipe 13 can be reliably collected inside the collecting container 11. It is desirable to.

The pipe 13 is preferably arranged to pass through the center of the opening 11a.

The collection vessel 11 is disposed on the hull bottom 6 of the offshore structure via a support 7, and the support 7 is insulated to prevent heat transfer between the collection vessel 11 and the hull bottom 6. It is made of possible materials.

In addition, a pipe 13 may be installed between the insulation panels 2 surrounding the tank body 1, and between the pipe 13 and the insulation panel 2, a material such as glass wool may be used. It is preferable that the heat insulating material 9 is interposed.

In FIG. 2, the pipe 13 is shown to be installed between the insulation panels 2, but the pipe 13 is not installed between all the insulation panels 2, and the number of installations of the pipe 13 is It can be appropriately increased or decreased in design. In addition, the pipe 13 may be installed in the center of the heat insulation panel 2.

The pipe 13 may be installed through the insulation panel 2, and the upper end of the pipe 13 may be located on the same plane as the upper surface of the insulation panel 2. In addition, an upper end of the pipe 13 may be located between the lower surface of the tank body 1 and the upper surface of the thermal insulation panel 2, wherein at least one upper end of the pipe 13 is provided for smooth flow of the leaking liquid. Preferably, holes or grooves are formed.

The upper end of the pipe 13 may be in close contact with the lower surface of the tank body 1, where the upper end of the pipe 13 may be fixed to the lower surface of the tank body 1 by welding or the like.

Even when the upper end of the pipe 13 is not fixed to the tank body 1, since the pipe 13 penetrates the heat insulating panel 2 or the heat insulating material 9, the heat insulating panel 2 or the heat insulating material 9 ), The pipe 13 can be fixed.

Hereinafter, a leaking liquid collecting device according to a second preferred embodiment of the present invention will be described with reference to FIGS. 4 and 5.

4 shows a leak liquid collecting device of a standalone storage tank according to a second preferred embodiment of the present invention, and FIG. 5 shows a partial plan view of the leak liquid collecting device of FIG. 4 and 5, the leak liquid collecting device of the independent storage tank according to the second preferred embodiment of the present invention, as in the first embodiment described above, is installed on the hull bottom 6 tank Extends from the gap 3 between the tank body 1 and the thermal insulation panel 2 to the interior of the collection vessel 21 and the collection vessel 21 for collecting the leaked liquid, ie liquefied gas, leaked from the body 1. And a pipe 23 as leaking liquid guide means which is installed as possible.

However, since the leak liquid collection apparatus which concerns on 2nd Embodiment has a difference only in the shape of the collection container 21 compared with 1st Embodiment, the same member number is attached | subjected to the same member and detailed description is abbreviate | omitted.

That is, the collection container 21 according to the second embodiment is a substantially rectangular cylinder-shaped leak liquid storage container in which the inside and the outside of the collection container can communicate only through the opening 21a formed in the upper surface. The collecting container 21 of the second embodiment is formed so that the upper side of the side is upright, whereas the collecting vessel 11 of the form is formed with an inclined chamfer on the upper side of each side.

According to the present invention, in addition to the collection container (11 or 21) of the illustrated shape can be of course having a cylindrical or polygonal cylinder shape.

On the other hand, according to the present invention, in normal times when liquefied gas is not leaked, cold air is transferred from the tank body 1 to the outside of the heat insulation panel 2 via the pipe 13 or 23 or the outside of the heat insulation panel 2. It is preferable to close the pipe 13 or 23 by a closing means made of a material which decomposes or deforms in contact with the liquefied gas so as to prevent heat from being transferred to the tank body 1 from the tank.

The closing means may be made of any material as long as it can chemically change or decompose or physically deform when it comes into contact with the liquefied gas to open the pipe 13 or 23.

According to the present invention, since the pipe is closed by the closing means at normal times when the liquefied gas is not leaked, the insulation state can be maintained, and in the emergency in which the liquefied gas is leaked, the closed state by the closing means is released and the liquefied gas leaked. It can be safely guided to the collection vessel (11 or 21) through the pipe (13 or 23).

As described above, according to the leaking liquid collecting device of the present invention, when the liquefied gas leaks from the independent storage tank, the leaked liquefied gas can be safely collected in the collection container 11 or 21.

In addition, since the collection vessel 11 or 21 is blocked inside and outside except the openings 11a or 21a which are only a part of the upper surface, the collection vessel leaks even when the movement of the marine structure is excessive depending on the sea condition. The liquefied gas contained in (11 or 21) can be reliably prevented from flying out of this collection container.

Accordingly, according to the present invention, since the hull bottom 6 is not in direct contact with the liquefied gas, the spray shield layer 8 installed on the hull bottom 6 for the protection of the conventional hull bottom 6 is provided. ), There is no need to be installed, the construction of the offshore structures as well as maintenance work can be facilitated, the construction cost and time of the offshore structures can be reduced.

Leakage collection device of the present invention can be applied to any of the offshore structures that are used while floating stand-alone storage tanks installed, that is, liquefied natural gas (LNG) or liquefied petroleum gas (LPG) It can be applied both to liquefied gas carriers and vessels such as LNG Regasification Vessels (LNG RVs) and offshore plants such as LNG Floating, Production, Storage and Offloading (FPSO) or LNG Floating Storage and Regasification Units (FSRU). have.

As described above, the leakage liquid collecting device of the independent storage tank according to the present invention was described with reference to the illustrated drawings, but the present invention is not limited to the embodiments and drawings described above, within the utility model registration claims Of course, various modifications and variations can be made by those skilled in the art to which the present invention pertains.

1 shows a hull protection system of a standalone storage tank comprising a drip tray according to the prior art;

Figure 2 is a side view of the leak liquid collection apparatus of the independent storage tank according to the first embodiment of the present invention,

3 is a partial plan view of a leaking liquid collecting device taken along line A-A of FIG.

4 is a side view of a leaking liquid collecting device of a standalone storage tank according to a second preferred embodiment of the present invention, and

FIG. 5 is a partial plan view of the leak liquid collecting apparatus taken along the line B-B of FIG. 4. FIG.

Description of the Related Art

1: tank body 2: heat insulation panel

3: gap 6: hull bottom

7: support 11, 21: collection container

11a and 21a openings 13 and 23 pipes as guide means

Claims (11)

As a leaking liquid collecting device of a stand-alone storage tank for storing liquefied gas installed in a marine structure used floating in the sea, A collection vessel installed between the tank body of the independent storage tank and the bottom of the hull of the marine structure to receive the leakage liquid; Guide means extending from the gap between the insulating panel attached to the outside of the tank body and the tank body to the inside of the collection container to guide the leaking liquid to the collection container; Leakage liquid collection device of the independent storage tank comprising a. The method according to claim 1, The collection container has a cylindrical shape and the opening is formed in the upper surface is the leakage liquid collection device of the independent storage tank, characterized in that for communicating the inside and outside of the collection container. The method according to claim 2, Leakage collection device of the independent storage tank, characterized in that the area of the opening is smaller than the total area of the upper surface. The method according to claim 1, The collection container has a rectangular parallelepiped shape in which each side is upright, and the upper surface of the collection container is leaking liquid collection apparatus of the independent storage tank, characterized in that the opening is formed for the guide means can be inserted. The method according to claim 4, The upper side of each side of the collection vessel is inclined to have a chamfer shape, the leakage liquid collection device of the independent storage tank. The method according to claim 1, The lower end of the guide means is located in the collection container, the lower end of the guide means is located lower than the upper surface of the collection container so that the leaking liquid guided through the guide means can be collected inside the collection container. Leakage collection device for standalone storage tanks. The method according to claim 1, Insulating liquid collection device of the independent storage tank, characterized in that the insulating panel is attached to the outside of the tank body to form a heat insulating layer, the guide means is installed through the heat insulating layer. The method according to claim 1, The upper end of the guide means is located between the lower surface of the tank body and the upper surface of the insulation panel, the liquid collection device of the independent storage tank. The method according to claim 1, The upper end of the guide means is leaking liquid collection device of the independent storage tank, characterized in that located on the same plane as the upper surface of the insulation panel. The method according to claim 1, Leakage liquid collection device of the independent storage tank, characterized in that the guide means is closed by the closing means which is decomposed or deformed when the liquefied gas is not leaked in normal times. As a leaking liquid collecting device of a stand-alone storage tank for storing liquefied gas installed in a marine structure used floating in the sea, A collection container for receiving the leakage liquid leaked from the independent storage tank; A pipe extending from the standalone storage tank to the collection container to guide the leakage liquid to the collection container; Including; Leakage collection device of the independent storage tank, characterized in that the upper surface of the collection container is formed with an opening having a size larger than the cross-sectional area of the pipe and smaller than the total area of the upper surface of the collection container.

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