KR102379076B1 - Cover for gas dome of liquefied gas cargo - Google Patents

Abstract

The present invention may provide a gas dome cover of a liquefied gas cargo hold, the cover body surrounding the lower open structure of the gas dome installed on the ceiling of the liquefied gas cargo hold of a carrier; a plurality of support shafts connected between the bottom surface of the cover body and the bottom surface of the lower open structure of the gas dome; and a plurality of inner protrusions installed to protrude from the inner surface of the cover body and spaced apart from each other in the height direction of the cover body; A plurality of gas holes are formed in the cover body to collect the gas generated in the .

Description

Gas dome cover of liquefied gas cargo hold {COVER FOR GAS DOME OF LIQUEFIED GAS CARGO}

The present invention relates to a gas dome cover of a liquefied gas cargo hold.

In general, liquefied gas (Liquefied Gas) is stored and transported in a liquefied gas transport ship in a liquefied state through the sea.

For example, the liquefied gas includes liquefied natural gas (LNG) or liquefied petroleum gas (Liquefied Petroleum Gas: LPG).

In particular, liquefied natural gas is obtained by cooling natural gas to a cryogenic temperature, for example, about -163° C., and its volume is reduced to about 1/600 compared to that of natural gas in gaseous state, so it can be suitable for long-distance transport through sea.

The liquefied gas carrier has a liquefied gas cargo hold including a plurality of liquefied gas storage tanks.

For example, the liquefied gas storage tank is classified into an independent tank type and a membrane type by standard in order to store liquefied gas such as LNG in a cryogenic state, and the independent tank type storage tank is a MOSS type and It is divided into IHI-SPB type, and there are GTT NO 96 type and Mark Ⅲ type for membrane type storage tank.

In addition, a pump tower, a liquid dome, a gas dome, etc. are installed in the liquefied gas storage tank for unloading and unloading of the liquefied gas.

The gas dome of the liquefied gas cargo hold according to the prior art is an inerting process of injecting an inert gas such as nitrogen gas into a liquefied gas storage tank to prevent the formation of an explosive mixture, or gasing that replaces the inert gas with evaporated natural gas It is used for gassing up work or is used as a recovery place for boil-off gas (BOG).

In particular, BOG may be conveyed to the reliquefaction system by a BOG compressor or a pump through the gas dome, cooled and liquefied in the heat exchanger of the reliquefaction system, and then returned to the liquefied gas storage tank.

If, in the reliquefaction system, the pump for pumping BOG is inoperable or malfunctions, there is a risk of explosion in BOG itself, so a means to prevent malfunction of the pump is urgently needed.

For example, when a liquefied gas transport ship is placed in extreme environmental conditions, violent sloshing occurs inside the liquefied gas storage tank, and as a result, the liquefied gas in the liquefied state in the storage tank directly contacts the gas dome, or the gas dome can be introduced into the

That is, when the carrier moves in a state in which the sloshing occurs or the liquefied gas is filled in the storage tank of the liquefied gas carrier under high filling conditions, suction of the pump is performed to process BOG. At this time, due to the liquefied gas coming into contact with the gas dome or flowing into the gas dome, there is a problem that the pump malfunctions.

According to the technical specifications of the pump for BOG treatment of the liquefied gas storage tank according to the prior art, the pump can withstand a very short time, but after that, it may malfunction or become inoperable, so BOG can be treated in a timely manner There is no, it must be incinerated in order to prevent an increase in the internal pressure of the liquefied gas storage tank, and there may be a problem that it has to be sent to another surplus gas treatment means, so a means to solve this problem is urgently required.

The present invention provides a breathable cover body capable of enclosing the lower open structure of the gas dome to prevent excessive inflow of liquid liquefied gas directly into the internal space of the gas dome, and various gaseous gases (eg, dry gas) , inert gas, evaporated natural gas, BOG, etc.) and can prevent malfunction of pumps installed on the path from the gas dome to the gas treatment system (eg reliquefaction system or gas filling system). It is intended to provide a gas dome cover for liquefied gas cargo holds.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

In order to solve the above problems, the present invention, a cover body surrounding the lower open structure of the gas dome installed on the ceiling of the liquefied gas cargo hold of the carrier; a plurality of support shafts connected between the bottom surface of the cover body and the bottom surface of the lower open structure of the gas dome; and a plurality of inner protrusions installed to protrude from the inner surface of the cover body and spaced apart from each other in the height direction of the cover body; In order to collect the gas generated in the cover body, a gas dome cover of the liquefied gas cargo hold in which a plurality of gas holes are formed may be provided.

In addition, the cover body may include a plurality of cantilever-shaped brackets installed on the inner surface of the cover body based on a position spaced upward from the inner protrusion; and an inner plate supported by the bracket part and having a relatively narrow size compared to the planar area of the cover body so as to be disposed in the inner space of the cover body in a non-contact state with the pipe end of the gas dome; may be further coupled there is.

In addition, the cover body, the bottom plate having a relatively larger area than the pipe diameter of the gas dome; a wall part connected to the edge of the bottom plate, erected vertically from the edge of the bottom plate, and having a height extending to the outer peripheral surface of the pipe end of the gas dome; a ring-shaped upper plate connecting the upper end of the wall portion and the outer peripheral surface of the pipe of the gas dome to each other; and a plurality of reinforcing ribs installed at a corner position between the upper plate and the wall unit or a corner position between the bottom plate and the wall unit.

In addition, the bottom plate of the cover body may be further provided with a drain unit connecting the inner space of the cover body and the inner space of the liquefied gas cargo hold to each other.

In addition, the cover body or the inner plate may be made of a breathable plate having a plurality of vents by performing laser micro-hole processing on the plate of the material.

According to the gas dome cover of the liquefied gas cargo hold according to the embodiment of the present invention, there is an effect of preventing malfunction of the pump for pressurizing various gases to be processed through the gas dome.

In addition, the gas dome cover of the liquefied gas cargo hold according to an embodiment of the present invention has the advantage of preventing pump malfunction or failure in advance, thereby saving pump maintenance and maintenance time.

In addition, since the gas dome cover of the liquefied gas cargo hold according to an embodiment of the present invention is made of a breathable material, while allowing gas flow in both directions from the inside of the cover to the outside of the cover or from the outside of the cover to the inside of the cover, By preventing the liquid liquefied gas from directly excessively flowing into the inner space of the gas dome, there is an advantage in that it is possible to prevent malfunction of the related system in which the pump is installed while performing the gas collection function and the gas diffusion function.

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

1 is a perspective view of a gas dome cover of a liquefied gas cargo hold according to an embodiment of the present invention.
2 is an exploded perspective view of the gas dome cover shown in FIG. 1 in order to explain the coupling relationship of the gas dome with the lower open structure.
3 is a view showing an installation state of the gas dome cover shown in FIG. 1 for the liquefied gas cargo hold.
FIG. 4 is an enlarged cross-sectional view of a circle A shown in FIG. 3 .

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION The detailed description set forth below in conjunction with the appended drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

In order to clearly explain the present invention in the drawings, parts not related to the description may be omitted, and the same reference numerals may be used for the same or similar components throughout the specification.

In the drawings, FIG. 1 is a perspective view of a gas dome cover of a liquefied gas cargo hold according to an embodiment of the present invention, and FIG. 2 is a gas dome shown in FIG. 1 to explain the coupling relationship with the lower open structure of the gas dome. It is an exploded perspective view of the cover.

1 and 2, the gas dome cover 10 of the liquefied gas cargo hold according to this embodiment is capable of inflow and outflow of gas to be processed through the gas dome 1, but the liquefied gas cargo hold 3 ( 3) Due to the liquefied gas surrounding the gas dome 1, under the condition of internal sloshing or high filling of the liquefied gas in the liquefied gas cargo hold 3, the gas dome 1 ) and the connected pump (not shown) may play a role in preventing malfunction or inoperability in advance.

As an example for this, the gas dome cover 10 of the liquefied gas cargo hold may include a cover body 100 , a support shaft portion 200 , an inner protrusion portion 300 , a bracket portion 400 , and an inner plate 500 . .

The cover body 100 , the support shaft part 200 , the inner protrusion part 300 , the bracket part 400 , and the connection and coupling of each component including the inner plate 500 may be made by welding or the like.

At this time, the lower open structure ( It can be paralleled when connecting and assembling the components in 2).

In addition, the support shaft part 200 and the bracket part 400 may be connected to the inner surface of the cover body 100 or connected to another part (eg, the bottom surface of the gas diffusion plate 2b or the bottom surface of the inner plate 500 ). In this case, the extension plates 210 and 410 may be further interposed at the end portions for welding connection, such as the support shaft 200 , in order to enlarge the welding area.

The cover body 100 may serve to surround the lower open structure 2 of the gas dome 1 installed on the ceiling of the liquefied gas cargo hold of the carrier.

More specifically, the cover body 100 may include a bottom plate 110 , a wall part 120 , a top plate 130 , and a reinforcing rib 140 .

The bottom plate 110 may have a relatively larger area than the pipe diameter of the gas dome 1 .

The wall part 120 may be connected to the edge of the bottom plate 110 , that is, an outer diameter portion of the bottom plate 110 .

The wall part 120 is erected vertically from the edge of the bottom plate 110 , and at this time, it may have a height extending to the outer peripheral surface of the pipe end of the gas dome 1 .

The upper plate 130 may refer to a ring-shaped plate member or a finishing plate to connect the upper end of the wall part 120 and the outer peripheral surface of the pipe of the gas dome 1 to each other.

Here, the inner diameter portion of the upper plate 130 may be connected to the outer peripheral surface of the pipe of the gas dome 1 by welding.

A plurality of reinforcing ribs 140 may be installed at a corner position between the upper plate 130 and the wall unit 120 or at a corner position between the bottom plate and the wall unit.

The reinforcing rib 140 may increase the durability and structural rigidity of the cover body 100 , and may serve to protect the cover body 100 from external force caused by sloshing or the like.

The gas dome 1 that is the target of the cover body 100 may refer to a pipe passing through the wall of the liquefied gas cargo hold 3 .

That is, the pipe end (1a) of the gas dome (1) protrudes through the ceiling of the liquefied gas cargo hold (3).

In addition, the lower open structure 2 is coupled to the pipe end 1a of the gas dome 1 .

Here, the lower open structure 2 includes a plurality of (eg, four) extension bars 2a spaced apart along the circumferential direction of the pipe end 1a of the gas dome 1, and the extension bars 2a. It may include a gas diffusion plate 2b connected to the end, and a cross-shaped reinforcement bar 2c for reinforcing the upper surface of the gas diffusion plate 2b and connecting the extension bars 2a facing each other while being spaced apart from each other.

The lower open structure 2 is formed of various gases (eg, dry gas, inert gas, evaporation) in a gaseous state (eg, gaseous) processed in the liquefied gas cargo hold 1 through the opening 2d between the extension bars 2a. natural gas, BOG, etc.) may flow.

In addition, various gases supplied from the outside flow relatively freely from the internal space of the gas dome 1 toward the internal space of the liquefied gas cargo hold 3 through the opening 2d, and are guided by the gas diffusion plate 2b at this time. , can be spread along the ceiling surface of the liquefied gas cargo hold (3).

In addition, various gases present in the internal space of the liquefied gas cargo hold 3 may also be freely introduced into the internal space of the gas dome 1 through the opening 2d.

If the gas dome cover 10 of the liquefied gas cargo hold of this embodiment is not applied, as mentioned above, when the liquefied gas high filling condition or sloshing occurs, the liquefied gas cargo hold 3 Liquefied gas in a liquid state (eg, liquid) that has reached the gas dome 1 or the lower open structure 2 based on the internal space of the This may cause malfunction or inoperability of a pump (not shown) associated with the gas dome 1 as a result.

However, in the case of applying the gas dome cover 10 of the liquefied gas cargo hold of this embodiment, a plurality of gas holes 121 may be formed in the cover body 100 .

In addition, through the design change, the cover body 100 has a plurality of vent holes made of a breathable material that can pass the liquefied gas in the gas phase and permeate the liquefied gas in the liquid phase by selection and processing of the material as will be described later. may be formed.

In addition, each gas hole 121 may also be covered by a perforated plate (not shown) having a plurality of ventilation holes.

In addition, since the diameter and number of the gas holes 121 may be determined through a gas flow amount, a flow rate, etc., it may not be limited to a specific value.

In addition, the cover body 100 is closed by the bottom plate 110 and the ring-shaped top plate 130 such as a disk-shaped as a box structure as will be described later.

Here, since the plurality of gas holes 121 are disposed on the upper side of the cover body 100, which is a position where the liquid gas does not touch even under a high filling condition or a slotting occurrence situation, the liquefied gas cargo hold ( 3) facilitates the entry or discharge of gas, or the collection of gas (eg, BOG) generated in the liquefied gas cargo hold 3, but the liquid liquefied gas easily flows into the interior of the cover body 100 As a result, it is possible to exhibit the effect of preventing the malfunction of the pump in advance.

That is, the cover body 100 may act as a barrier for suppressing the flow of the liquid liquefied gas with respect to the opening 2d of the lower open structure 2 of the gas dome 1 .

The plurality of support shaft portions 200 are the bottom surface of the cover body 100 (eg, the top surface of the bottom plate 110 of the cover body 100) and the bottom surface of the lower open structure 2 of the gas dome 1 (eg, : It may be connected between the bottom surface of the gas diffusion plate 2b).

The plurality of support shaft portions 200 serve to increase the structural durability of the cover body 100 based on the bottom surface of the lower open structure 2 of the gas dome 1 , and the gas diffusion plate of the lower open structure 2 ( 2b) and the bottom plate 110 of the cover body 100 may serve to secure the temporary liquid storage chamber 111 (refer to FIG. 4 ).

That is, the case where the liquid liquefied gas flows into the interior of the cover body 100 via the gas hole 121 is very rare, but there may be.

However, even in this case, since the fluid passage area of the gas hole 121 is significantly smaller than the fluid passage area of the opening 2d of the lower open structure 2 of the gas dome 1, it can be relatively very small. Only the liquefied gas in the liquid state can flow into and fall into the interior of the cover body 100 .

In this case, the liquid liquefied gas that can be dropped through the gas hole 121 is collected toward the temporary liquid storage chamber 111 between the aforementioned gas diffusion plate 2b and the bottom plate 110 of the cover body 100 . As a result, it can be inhibited from flowing the liquid gas directly toward the inner space of the gas dome (1).

That is, the liquid flow in the temporary liquid storage chamber that can be directed toward the gas dome 1 is first blocked by the gas diffusion plate 2b, and the gas dome is secondarily blocked by the inner plate 500 to be described later. The liquid flow in the central region of the pipe in 1) can be blocked.

In addition, the liquid flow in the temporary liquid storage chamber 111, which can be directed toward the gas dome 1, may be made along the inner surface of the cover body 100, depending on cases such as sloshing or excessive vessel motion, but the cover body The effect that can also be blocked by the inner protrusion 300 protruding from the inner surface of 100 can be exhibited.

To this end, the plurality of inner protrusions 300 are installed to protrude from the inner surface of the cover body 100 (eg, the inner surface of the wall portion 120 of the cover body 100), and It may be spaced apart in the height direction.

Each inner protrusion 300 may have a cross-sectional shape of Hangeul Giyeok or Nieunja.

For example, each inner protrusion 300 has a bent portion 310 having a cross-sectional shape of Hangeul Giyeokja or Nieunja having a ring shape, and connecting the bent portion 310 to the inner surface of the wall portion 120 of the cover body 100 . It may be made of a ring-shaped adapter part 320 for the purpose.

At this time, the end of the bent portion 310 faces downward.

In addition, in the case of adjusting the flow path of the liquid liquefied gas, the height of the bent portion 310 protruding based on the inner surface of the adapter portion 320 may be set differently, and the bending shape may be the same or different from each other. Therefore, it may not be limited to a specific cross-sectional shape.

However, as an example, the cross-sectional shape of the Hangeul Giyeokja or Nieunja characters of each internal protrusion 300 extends in the horizontal direction along the inner surface of the wall part 120 of the cover body 100, so each internal protrusion 300 is Each may be a closed loop structure.

Here, the adapter portion 320 of each inner protrusion 300 may be connected to the inner surface of the wall portion 120 of the cover body 100 by any one of welding, fusion, or a conventional structure attachment method.

Therefore, due to the shape characteristics of each inner protrusion 300 (eg, the end of the bent portion 310 faces downward), the liquid flow of the liquid liquefied gas is downward along the surface of the inner protrusion 300 . It can flow out relatively easily.

In addition, the liquid liquefied gas formed at the end of the bent portion 310 of the inner protrusion 300 may directly fall toward the bottom plate of the cover body 100 .

On the other hand, the liquid flow upward (for example, in the direction toward the gas dome 1) due to external force such as sloshing and hull motion is a bending portion 310 of a plurality of internal protrusions 300 that serve as a sill or a stumbling block. can be blocked and inhibited by

That is, each of the inner protrusions 300 suppresses the upward liquid flow, and the probability that the liquid liquefied gas collides with the surface of each inner protrusion 300 and changes into a gaseous phase is high, so at least the liquid liquefied gas is directly As a result, it is possible to exhibit a superior effect that can prevent inflow into the interior of the gas dome (1).

Meanwhile, the bracket part 400 and the inner plate 500 may be further coupled to the cover body 100 .

Here, the bracket part 400 is provided on the inner surface of the cover body 100 (eg, the inner surface of the wall part 120 of the cover body 100 ) based on the position spaced upward from the inner protrusion part 300 . It is installed as a pedestal, and each may be formed in a cantilever shape to serve as a pedestal.

The bracket unit 400 may be radially disposed to face the center of the cover body 100 .

The supporting target or the supporting target of the bracket 400 may be the inner plate 500 to be located in the center of the cover body 100 .

The inner plate 500 has a smaller diameter than the inner diameter of the pipe end 1a of the gas dome 1, or the cover body 100 so as to inhibit the liquid flow into the gas dome 1 while enabling the gas flow. It may be manufactured to have a relatively narrow size compared to the planar area of

For example, the inner plate 500 may be disposed in the inner space of the cover body 100 in a non-contact state with the pipe end 1a of the gas dome 1 and supported by the aforementioned bracket 400 . .

That is, gas may flow through the space between the outer diameter portion of the inner plate 500 and the inner diameter of the pipe end 1a of the gas dome 1 .

On the other hand, the bottom plate 110 of the cover body 100 may be further provided with a drain 150 connecting the inner space of the cover body 100 and the inner space of the liquefied gas cargo hold 3 to each other.

The drain unit 150 may be coupled to the bottom plate 110 by a conventional pipe-through installation method using a straight pipe or a curved pipe.

At this time, the upper portion of the drain unit 150 protrudes relative to the upper surface of the bottom plate 110 , or a predetermined protrusion height h (eg, the water level of the liquid liquefied gas inside the temporary liquid storage chamber 111 ). ) may be arranged to have

In this case, even if the water level of the liquid liquefied gas in the cargo hold 3 contacts the bottom surface of the cover body 100 or rises slightly higher to submerge the bottom surface of the cover body 100, the liquid liquefied gas is discharged from the drain part ( There is an effect that only a portion of the inner space of 150) may not flow into the interior of the cover body 100 .

Then, by sloshing, etc., the liquefied gas flows into the temporary liquid storage chamber 111 through the gas hole 121, and thereafter, the water level in the temporary liquid storage chamber 111 increases with the drain portion ( When the protrusion height (h) of the upper portion of the 150 , or more, liquid liquefied gas may be discharged to the outside of the cover body 100 via the drain unit 150 .

The diameter of the drain unit 150 may be selectively determined within a range sufficient to achieve the purpose of the drain while suppressing the inflow as much as possible by sloshing.

3 is a view showing an installation state of the gas dome cover shown in FIG. 1 for a liquefied gas cargo hold, and FIG. 4 is an enlarged cross-sectional view of the circle A shown in FIG.

3 and 4 , the plurality of gas holes 121 of the cover body 100 are lower than the installation height of the inner plate 500 , and the bottom surface of the lower open structure 2 of the gas dome 1 (eg, : Based on any one position selected within a range higher than the bottom surface of the gas diffusion plate 2b), the wall portion 120 passes through the wall portion 120 of the cover body 100 in the wall thickness direction. is formed in

At this time, the plurality of gas holes 121 are disposed at an installation height equal to that of the bracket unit 400 with respect to the bottom plate 110 of the cover body 100 .

In addition, the gas holes 121 may be spaced apart from each other in the horizontal direction of the cover body 100 to increase gas diffusion performance.

In addition, the cover body 100, the support shaft portion 200, the inner protrusion portion 300, the bracket portion 400 and the inner plate 500 are made of stainless steel, an aluminum alloy material for the barrier of the liquefied gas cargo hold, invar. Material, it may be formed of any one of a 9% nickel steel material.

In particular, the cover body 100 is a box structure made of a plate material of the above-mentioned material, and may have any one shape of a cylindrical shape, a hexahedral shape, and a polygonal shape, and may have gas flow but minimize liquid flow while maintaining durability. It does not need to be limited to a specific shape if it can be secured.

On the other hand, the cover body 100 and/or the inner plate 500 performs laser micro-hole processing on the plate material of the aforementioned material to minimize the liquid flow while enabling smoother gas flow in usual times. It may be made of a breathable plate having a ventilation hole.

Here, the diameter of each of the vents by laser micro-hole processing may be set to a numerical value within the range of several tens of micrometers or more and 1 millimeter or less, provided that gaseous liquefied gas may pass, but liquid liquefied gas may pass through. When the maximum suppression condition is satisfied, it may not be limited to a specific value, such as any one value selected within and outside the above range.

Therefore, when the liquid liquefied gas is in a sloshing or high filling condition, a small amount permeates into the interior of the cover body 100 through the plurality of vent holes, so the purpose of preventing malfunction of the pump can be sufficiently achieved. There is this.

As such, in the gas dome cover of the liquefied gas cargo hold according to this embodiment, when the liquefied gas cargo hold 3 is a membrane type, there is a difficulty in installing a membrane barrier when attaching an additive in the cargo hold 3, etc. As described above, by being installed based on the pipe of the gas dome 1, there is an advantage that can solve the cover installation problem.

In addition, the gas dome cover of the liquefied gas cargo hold according to this embodiment has an inner protrusion 300 on the inner surface of the cover body 100 to suppress the liquid flow that may occur along the inner surface of the cover body 100 . In addition, it is possible to also suppress the inflow of liquefied gas in the liquid phase toward the inner space of the pipe of the gas dome 1 through the inner plate 500, as a result, it is possible to prevent a malfunction or inoperability of the existing pump in advance. , it has the advantage of stably maintaining the pump suction efficiency.

The embodiments of the present invention disclosed in the present specification and drawings are merely provided for specific examples to easily explain the technical content of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention.

Therefore, the scope of the present invention should be construed as including all changes or modifications derived based on the technical idea of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

10: gas dome cover of liquefied gas cargo hold 100: cover body
200: support shaft 300: inner protrusion
400: bracket 500: inner plate

Claims (5)

a cover body surrounding the lower open structure of the gas dome installed on the ceiling of the liquefied gas cargo hold of the carrier;
a plurality of support shafts connected between the bottom surface of the cover body and the bottom surface of the lower open structure of the gas dome; and
A plurality of inner protrusions installed to protrude from the inner surface of the cover body and spaced apart from each other in the height direction of the cover body;
A gas dome cover of a liquefied gas cargo hold in which a plurality of gas holes are formed in the cover body for the entry or discharge of gas into or out of the liquefied gas cargo hold, or for the collection of gas generated in the liquefied gas cargo hold. The method of claim 1,
In the cover body,
a bracket portion having a cantilever shape installed in plurality on the inner surface of the cover body based on a position spaced upward from the inner protrusion; and
Liquefied gas further coupled to an inner plate supported by the bracket part and having a relatively narrow size compared to the planar area of the cover body so as to be disposed in the inner space of the cover body in a non-contact state with the pipe end of the gas dome Gas dome cover of cargo hold. 3. The method of claim 2,
The cover body is
a bottom plate having an area relatively larger than a pipe diameter of the gas dome;
a wall part connected to the edge of the bottom plate, erected vertically from the edge of the bottom plate, and having a height extending to the outer peripheral surface of the pipe end of the gas dome;
a ring-shaped upper plate connecting the upper end of the wall portion and the outer peripheral surface of the pipe of the gas dome; and
A gas dome cover of a liquefied gas cargo hold comprising a; a plurality of reinforcing ribs installed at a corner position between the upper plate and the wall unit or a corner position between the bottom plate and the wall unit. 4. The method of claim 3,
On the bottom plate of the cover body,
A gas dome cover of a liquefied gas cargo hold in which a drain portion connecting the inner space of the cover body and the inner space of the liquefied gas cargo hold is further installed. 3. The method of claim 2,
The cover body or the inner plate is made of a breathable plate having a plurality of vents by performing laser micro-hole processing on a plate made of any one of stainless steel, aluminum alloy, invar, and 9% nickel steel. Gas dome cover of liquefied gas cargo hold.

Images