KR20190031008A - Liquid dome box of membrane type liquefied natural gas cargo insulation system and sealing method thereof - Google Patents

Abstract

The present invention relates to a liquid dome of a membrane type liquefied natural gas cargo insulation system and a liquid dome box sealing method thereof, which update and use an existing welding procedure specification without writing a new welding procedure specification, thereby reducing a specimen producing cost, time for a test, and time required for writing the new welding procedure specification. In addition, the present invention is possible to reduce construction time and required materials, strengthen a sealing structure of the liquid dome box, and drastically improve insulation performance.

Description

TECHNICAL FIELD [0001] The present invention relates to a membrane type liquefied natural gas (LNG)

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquid dome of a membrane type liquefied natural gas cargo hold insulation system and a liquid dome box sealing method thereof, and more particularly, to an existing welding procedure specification, Membrane-type liquefied natural gas cargo holds that can save cost, save test time, reduce construction time and materials required, solidify the sealing structure of liquid dome box, and greatly improve insulation performance A liquid dome of the system and a liquid dome box sealing method thereof.

Liquefied natural gas (LNG) is a natural gas containing methane as its main component cooled to a temperature of -162 ° C to reduce its volume to about 1/600. In order to use liquefied natural gas as an energy source It is necessary to transfer large quantities of liquefied natural gas from the production base to the demand site, which requires a liquefied natural gas carrier.

That is, in a loading port which is a production place of natural gas, the gaseous natural gas is liquefied at a cryogenic temperature and stored in the storage tank of the liquefied natural gas carrier. In addition, after arriving at the unloading port, The gas is vaporized and converted into natural gas, which is then supplied to the consumer through piping and the like.

Generally, a liquid dome is installed on the cargo hold as a passage for loading and unloading of liquefied natural gas cargo in a cargo hold of a LNG-FPSO or LNG-FPSO.

In a conventional membrane type LNG (liquefied natural gas) CCS (cargo containment system), a liquid dome box is sealed by a method in which a liquid dome box is bonded to a hull inner surface (Mark Ⅲ type), or install a liquid dome box at the same height as the top of the inner hull, and place a glass wool between the liquid dome box and the plywood box There is a way to insert (NO96 type).

However, in the conventional sealing structure of the liquid dome box of the membrane LNG CCS, the primary membrane is made of stainless steel (SUS) and the membrane of the liquid dome box is made of Invar ), It is necessary to concentrate the stress on the welded portion between the different materials due to the difference of thermal expansion and shrinkage between the dissimilar material of the sUSA and the Invar. As a result, the stress concentration at the welded portion causes fracture and leakage leakage may occur.

Currently, Welding Procedure Specification (WPS) is applied to different materials between a short length member (length of 100 mm or less, thickness of 15 to 20 mm) and a thin thickness invar member (thickness of 0.1 to 2.0 mm) ).

However, welding of a different length material between a long length (less than 500 mm in length and 0.1 to 2.0 mm in thickness) and a lengthy and thin ingot member (100 mm or more in length and 0.1 to 2.0 mm in thickness) Since the procedure specification does not exist, it has not been verified that fracture and leakage prevention due to the stress concentration at the welding site is prevented.

Therefore, for a heterogeneous material having a long length and a thin thickness (not less than 500 mm in length and 0.1 to 2.0 mm in thickness) and a lengthy and thin in-bar member (100 mm or more in length and 0.1 to 2.0 mm in thickness) In order to certify the specification, it is faced with various difficulties such as execution of tens to hundreds of welding test and approval of the welding procedure specification from the classification society.

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The present invention can reduce the cost of producing test pieces and save test time by using the thick plate members and the thin plate members so that the existing welding procedure specifications can be updated and used without creating a new welding procedure specification, A liquid dome of a membrane type liquefied natural gas cargo hold insulation system and a liquid dome box sealing method of the same.

In order to accomplish the above object, the present invention provides a liquid dome of a membrane-type liquefied natural gas cargo hold insulation system and a liquid dome box sealing method thereof.

The liquid dome of the membrane type liquefied natural gas cargo hold insulation system of the present invention comprises: a secondary insulation panel installed on an inner hull of a cargo hold; A liquid dome anchor welded to an upper surface of the inner hull along an opening of the liquid dome; A secondary insulation panel supported on the liquid dome anchor and installed on an upper portion of the inner hull; A secondary inlet membrane disposed above the secondary insulation panel; A primary insulation panel installed on the upper part of the secondary inlet membrane; A primary susceptor installed on an upper portion of the primary insulation panel; A primary end plate welded to an end of the primary susceptor; A liquid dome box for sealing the opening; A liquid dome box membrane installed on the liquid dome box; A lower end surface welded to the upper surface of the inner hull and an upper end surface of the lower end surface of the liquid dome box membrane and a lower end surface of the liquid dome box membrane A thick sus membrane of welded material; And a thin sus membrane attached to the upper surface of the primary end plate and the liquid dome box membrane and welded to the upper end surface of the primary end plate and the upper end surface of the liquid dome box membrane, .

The thick plate member prevents thermal expansion and contraction in the hull width direction (Y direction).

A plurality of the above-mentioned thick plate members are arranged at regular intervals in the ship body width direction (Y direction), and the thin plate members are disposed between the above thick plate members.

And a heat insulating material may be installed in a space between the secondary thermal insulating panel and the boundary secondary thermal insulating panel.

According to another aspect of the present invention, there is provided a method of sealing a liquid dome box, comprising: providing a secondary inlet membrane and a primary cease membrane on top of a secondary insulation panel and a primary insulation panel, respectively; Welding a primary end plate to an end of the primary slow membrane; Installing a liquid dome box membrane on top of the liquid dome box; Wherein a thick sus membrane of a susund material is installed in a space between the liquid dome box and the heat insulating panel, the lower end surface of the thick plate member is welded to the upper surface of the inner hull, Welding the bottom end of the car end plate and the bottom end of the liquid dome box membrane; And welding a thin sus membrane to the upper surface of the primary end plate and the liquid dome box membrane; .

The thick plate member prevents thermal expansion and contraction in the hull width direction (Y direction).

A plurality of the thick plate members are disposed at regular intervals in the hull width direction (Y direction), and the thin plate members are disposed between the thick plate members.

As described above, according to the present invention, since the conventional problems can be solved by using the thick plate member and the thin plate member so that the existing welding procedure specification can be updated and used without creating a new welding procedure specification, , Saves testing time and significantly reduces the time required to create a new welding procedure specification.

In addition, in the present invention, the construction time and required materials can be reduced, the sealing structure of the liquid dome box can be firmly secured, and the heat insulating performance can be greatly improved.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing a secondary insulation panel installed on the upper surface of an inner hull in a liquid dome of a membrane type liquefied natural gas holding window insulation system of the present invention; Fig.
2 is a perspective view of a liquid dome of a membrane type liquefied natural gas holding window insulation system of the present invention showing a heat insulating material and a secondary insulation panel for a boundary,
3 is a perspective view showing a secondary dome panel and a secondary inlet membrane in a liquid dome of the membrane type liquefied natural gas holding window insulation system of the present invention.
4 is a perspective view showing the installation of the primary insulation panel in the liquid dome of the membrane type liquefied natural gas holding window insulation system of the present invention.
5 is a perspective view showing a primary dipping membrane and a primary end plate in a liquid dome of a membrane type liquefied natural gas holding window insulation system of the present invention.
6 is a perspective view showing a space formed between the liquid dome box, the primary insulation panel and the secondary insulation panel in the liquid dome of the membrane type liquefied natural gas holding window insulation system of the present invention.
7 is a perspective view showing a liquid dome of the membrane type liquefied natural gas holding window insulation system of the present invention.
Fig. 8 is an enlarged view of a portion A in Fig. 7, and is a perspective view showing a welding structure of the thick plate member and the thin plate member.
Fig. 9 is a plan view of Fig. 8
10 is a block diagram illustrating a liquid dome box sealing method of a membrane type liquefied natural gas holding window insulation system of the present invention

In general, the WPS (Welding Procedure Specification) is a guide to how the welding should proceed during the production of the product, the purpose of which is to support planning and quality control of the welding operation.

Before welding, be sure to fill out the relevant welding procedure specifications in order to ensure sufficient post-welding quality and performance. All welding operations must be planned before production, and the welding plan includes welding procedures for all welded joints.

In overlapping welding of different materials in a cargo hold insulation system, it is recommended to use a different material between a short length (less than 100 mm in length, 15 to 20 mm in thickness) and a thin in-bar member (thickness of 0.1 to 2.0 mm) Welding Procedure Specification (WPS) exists.

However, welding of a different length material between a long length (less than 500 mm in length and 0.1 to 2.0 mm in thickness) and a lengthy and thin ingot member (100 mm or more in length and 0.1 to 2.0 mm in thickness) Since the procedure specification does not exist, it has not been verified that fracture and leakage prevention due to the stress concentration at the welding site is prevented.

Therefore, the present invention is applicable to a welding between a primary end plate and a liquid dome box membrane, that is, welding between a first end member having a long length and a thin thickness (not less than 500 mm in length and 0.1 to 2.0 mm in thickness) The thickness of the test specimen can be reduced by using the thick plate member and the thin plate member so that the existing welding procedure specification can be updated and used without preparing a new welding procedure specification for the heterogeneous material having a thickness of 100 mm or more and a thickness of 0.1 to 2.0 mm, Saving test time and reducing the time required to create a new welding procedure specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid dome and a liquid dome box sealing method of a membrane type liquefied natural gas holding window insulation system of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a secondary insulation panel installed on an upper surface of an inner wall of a liquid dome of a membrane type liquefied natural gas holding window insulation system of the present invention, and FIG. 2 is a perspective view of a membrane- FIG. 3 is a perspective view of a liquid dome of a membrane type liquefied natural gas holding window insulation system of the present invention, showing a secondary insulation panel and a secondary inlet membrane. FIG. 3 is a perspective view showing a heat insulation material and a secondary insulation panel for a boundary in a liquid dome. FIG. 4 is a perspective view showing the installation of a primary insulation panel in a liquid dome of a membrane type liquefied natural gas hold window insulation system of the present invention, and FIG. 5 is a perspective view of a liquid dome of a membrane type liquefied natural gas FIG. 6 is a perspective view showing a primary side membrane and a primary end plate in the membrane type liquefied natural gas 7 is a perspective view showing a liquid dome of the membrane type liquefied natural gas holding window insulated system of the present invention, and FIG. 7 is a perspective view showing a liquid dome of the membrane type liquefied natural gas hold window insulation system of the present invention Fig. 8 is an enlarged view of a portion A in Fig. 7, and is a perspective view showing a welding structure of a thick plate member and a thin plate member, and Fig. 9 is a plan view of Fig. Because of the nature of the cargo hold, the liquid dome enclosure structure has the same configuration on four sides, and therefore, only one side is shown in the present embodiment and only the description will be given.

Furthermore, the X-axis direction and the Y-axis direction mentioned above with respect to one surface of the liquid dome are merely intended to explain the installation and disposition of the thick plate member and the thin plate member. On the other surface of the liquid dome, The axial directions can be changed in opposite directions.

Referring to the above drawings, the liquid dome of the membrane type LNGC storage system of the present invention is provided with a secondary insulation panel 110 on an inner hull 10 of a cargo hold.

The secondary insulation panels 110 are spaced apart from the inner hull 10 by an epoxy mastic of the inner hull 10 and fixed to the inner hull 10 by a securing device. . Hereinafter, the epoxy mastic and the fixing device correspond to a technique commonly known in the art, and a description thereof will be omitted.

A liquid dome anchor 120 may be formed on the upper surface of the inner hull 10 along the opening of the liquid dome. The boundary secondary insulation panel 130 is installed on the upper part of the inner hull 10 while the boundary secondary insulation panel 130 is supported on the liquid dome anchor 120. [

The boundary thermal insulation panel 130 can be fixed to the inner hull 10 by means of an epoxy mastic and a fixing device of the inner hull 10.

A heat insulating material 140 such as polyurethane foam or glass wool may be installed between the secondary thermal insulating panel 110 and the boundary secondary thermal insulating panel 130.

A secondary inlet membrane 150 is installed on the upper portion of the secondary insulation panel 110. The secondary inlet membrane 150 has a groove 150a. The secondary invar membrane 150 is formed of a thin sheet member formed of an invar material. A secondary end plate 151 made of an invar material may be welded and fixed to an end of the secondary invar membrane 150.

The secondary in-line membrane 150 is stacked on the secondary insulation panel 110 to seal the secondary insulation panel 110 so that the material (e.g., LNG) inside the cargo holds penetrates the secondary insulation panel 110 And can be fixed to the thermal protector 111 of the secondary insulation panel 110 by welding.

A primary heat insulating panel 160 is disposed on the upper portion of the secondary inversion membrane 150 and an end of the primary heat insulating panel 160 is extended to the boundary secondary heat insulating panel 130. The primary insulating panel 160 may be secured by a securing device.

A primary susceptor membrane 170 is installed on the primary heat insulating panel 160. The primary susceptor membrane 170 may include a wrinkle portion 171. The corrugated portion 171 has an effect corresponding to thermal expansion and contraction in the X-axis direction.

The primary susceptor 170 is stacked on the primary heat insulating panel 160 to seal the primary heat insulating panel 160 so that the material (e.g., LNG) inside the cargo hold penetrates the primary heat insulating panel 160 And may be welded to the thermal protector 161 of the primary heat insulating panel 160 and fixed thereto.

The first secondary membrane 170 can be assembled by overlap welding along adjacent lines of adjacent pieces in a state in which pieces corresponding to a piece of the plate on which the corrugations 171 are formed are arranged in parallel have. The welding method can be changed according to the design conditions.

A primary end plate 175 may be welded to an end of the primary susceptive membrane 170. The primary end plate 175 may be formed of a thin sheet member formed of a cushion material. The primary end plate 175 may be continuous welded (lap welded).

As described above, the secondary inlet membrane 150 is attached through the thermal protector 111 of the secondary insulation panel 110 to complete the secondary wall surface of the cargo hold, and the primary cease membrane 170 is connected to the primary insulation And is attached through the thermal protector 161 of the panel 160 to complete the first wall surface of the cargo hold.

A liquid dome box 180 is provided to seal the opening 11 of the liquid dome. A liquid dome box membrane 181 is installed at an upper portion of the liquid dome box 180.

The liquid dome box membrane 181 may be formed of a thin sheet member formed of an invar material.

A space S is formed between the liquid dome box 180 and the primary insulation panel 160 and the secondary insulation panel 110 and a thick sus membrane 190 are inserted and installed. The thick plate members 190 are spaced apart from each other at a predetermined interval by considering the thermal expansion and contraction of the thick plate member 190.

The upper end face of the thick plate member 190 is welded to the upper end face of the primary end plate 175 and the lower end face of the liquid dome box 190, And is fixed to the bottom surface of the membrane 181 by a fillet welding method. The welding method can be changed according to the design conditions.

That is, since the thick plate member 190 is formed to be long and thick in the width direction and is welded to the lower end surface of the primary end plate 175 and the lower end surface of the liquid dome box membrane 181, the thermal expansion and contraction in the Y direction is effectively prevented .

In addition, a thin sus membrane 195 is disposed on the upper surface of the primary end plate 175 and the liquid dome box membrane 181. That is, the thin plate member 195 may be composed of a collar piece, and may be fixed in an overlap welding manner over the upper end surface of the primary end plate 175 and the upper end surface of the liquid dome box membrane 181 have.

The thin sus membrane 195 is welded to the upper end surface of the primary end plate 175 and the upper end surface of the liquid dome box membrane 181 so that the gap between the thick plate members 190 can be completely sealed.

The upper surface of the thick plate member 190 is welded to the lower end surface of the primary end plate 175 and the lower end surface of the liquid dome box membrane 181 and both sides of the thin sus membrane 195 are welded The upper end surface of the primary end plate 175 and the upper end surface of the liquid dome box membrane 181 are welded and sealed to completely seal the gap between the primary end plate 175 and the liquid dome box membrane 181 Lt; / RTI >

At this time, by the welding of the thick plate member 190, thermal expansion and shrinkage in the ship body width direction (Y direction) are effectively prevented.

The thin plate member 195 is welded over the upper end surface of the primary end plate 175 and the upper end surface of the liquid dome box membrane 181 so that the primary end plate 175 and the liquid dome box membrane 181 are welded, (Gap) between them. At this time, the thin plate members 195 are disposed between the thick plate members 190. That is, the thin plate member 195 is configured to seal the portion that is not sealed by the thick plate members 190.

10 is a block diagram illustrating a method of sealing a liquid dome box in a membrane type liquefied natural gas holding window insulation system of the present invention.

Referring to FIG. 10, the liquid dome box sealing method of the present invention is as follows.

The liquid dome box sealing method of the present invention includes a step of installing a secondary inlet membrane 150 and a primary secondary membrane 170 on the upper side of the secondary insulation panel 110 and the primary insulation panel 160 S10).

In step S10, a secondary insulation panel 110 is installed on the inner hull 10. The secondary insulation panel 110 is spaced apart from the inner wall 10 by an epoxy mastic of the inner wall 10. The secondary insulating panel 110 is fixed by a securing device.

A liquid dome anchor 120 is formed on the upper surface of the inner hull 10 along the opening of the liquid dome. The liquid dome anchor 120 is provided with an inner The boundary insulating secondary panel 130 is installed on the upper portion of the hull 10.

A gap insulation 140 may be provided between the secondary insulation panel 110 and the boundary secondary insulation panel 130. The material may be a glass wool and a polyurethane foam (PUF) Can be used.

A secondary inlet membrane (150) is installed on the upper part of the secondary insulation panel (110). The secondary inlet membrane 150 is welded and fixed using the thermal protector 111 of the secondary insulation panel 110.

The secondary in-line membrane 150 is stacked on the secondary insulation panel 110 to seal the secondary insulation panel 110 so that the material (e.g., LNG) inside the cargo holds penetrates the secondary insulation panel 110 Do not let them. The primary heat insulating panel 160 is fixed using a securing device.

A primary susceptor membrane 170 is installed on the primary heat insulating panel 160. The primary susceptor membrane 170 is welded and fixed through the thermal protector 161 of the primary heat insulating panel 160.

The primary susceptor 170 is stacked on the primary heat insulating panel 160 to seal the primary heat insulating panel 160 so that the material (e.g., LNG) inside the cargo hold penetrates the primary heat insulating panel 160 Do not let them.

Next, the liquid dome box sealing method of the present invention includes a step (S20) of welding the primary end plate 175 to the end of the primary shock membrane 170. The primary end plate 175 is welded to the end of the primary slow membrane 170 by a method of overlap welding.

Next, the liquid dome box sealing method of the present invention includes a step (S30) of installing a liquid dome box membrane 151 on the upper part of the liquid dome box 150.

The liquid dome box sealing method of the present invention is a method of sealing a thick sus membrane in a space S between the liquid dome box 150 and the primary and secondary thermal insulation panels 160, The lower end surface of the thick plate member 190 is welded to the upper surface (or the inner surface) of the inner hull 10 and the upper surface is welded to the lower end surface of the primary end end plate 175 and the lower end surface of the liquid dome box membrane 190 (S40) of welding to the bottom end surface of the end plate 151. [

In step S40, the lower end surface of the thick plate member 190 of the cusp material is welded to the upper surface of the inner mortar 10 by a fillet welding method and the upper end surface of the thick plate member 190 of the cusp material is welded to the primary end plate 175 And the bottom surface of the liquid dome box membrane 181 by fillet welding.

The upper surface of the thick plate member 190 is welded to the lower end surface of the primary end plate 175 and the lower end surface of the liquid dome box membrane 181 to form a gap between the primary end plate 175 and the liquid dome box membrane 181 Seal the gap (gap) first.

And effectively prevents the thermal expansion and shrinkage in the ship body width direction (Y direction) by welding the thick plate member 190. That is, since the upper surface of the thick plate member 190 is formed to be long and thick in the width direction and welded to the lower end surface of the primary end plate 175 and the lower end surface of the liquid dome box membrane 181, the thermal expansion and contraction in the Y- .

Next, the liquid dome box sealing method of the present invention includes a step (S50) of welding a thin sus membrane 195 to the upper end surface of the primary end plate 175 and the liquid dome box membrane 181 ).

In step S50, a thin sus membrane 195 is disposed over the upper end surfaces of the primary end plate 175 and the liquid dome box membrane 181.

That is, both sides of the thin plate member 195 are welded in an overlapping manner over the upper end surface of the primary end plate 175 and the upper end surface of the liquid dome box membrane 181.

The thin plate member 195 is welded over the upper end surface of the primary end plate 175 and the upper end surface of the liquid dome box membrane 181 so that the gap between the primary end plate 175 and the liquid dome box membrane 181 (Gap) is sealed secondarily. At this time, the thin plate member 195 is disposed and welded in the space between the thick plate members 190, thereby completely sealing the gap.

As described above, according to the present invention, since the conventional problems can be solved by using the thick plate member and the thin plate member so that the existing welding procedure specification can be updated and used without creating a new welding procedure specification, , Saves testing time and significantly reduces the time required to create a new welding procedure specification.

In addition, in the present invention, the construction time and required materials can be reduced, the sealing structure of the liquid dome box can be firmly secured, and the heat insulating performance can be greatly improved.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. It will be clear to those who have.

In the description of the present invention, terms such as primary, secondary and the like are used to simply distinguish one element from another, and the terms "upper" (upper surface), lower (lower surface) ) And Y direction (hull width direction) can be expressed differently depending on the position where the position between the components is regarded as simply representing the position between the components and the position of the cargo hold for convenience of explanation.

In addition, in each step, the identification code is used for convenience of explanation, and the identification code does not describe the order of each step, and each step is different from the specified sequence unless the specific order is explicitly stated in the context. . That is, each of the steps may be performed in the same order as described, or may be performed substantially concurrently or in the reverse order.

10: Inner hull
11: opening of the liquid dome (opening)
110: Secondary insulation panel
111: Thermal protector
120: Liquid dome anchor
130: secondary insulation panel for boundary
140: Insulation
150: Secondary Invar Membrane
151: Secondary end plate
160: Primary insulation panel
161: Thermal protector
170: Primary susceptor membrane
175: primary end plate
180: Liquid dome box
181: Liquid Dome Box Membrane
190: thick sus membrane
195: thin sus membrane

Claims (11)

A secondary insulation panel installed above the inner hull of the cargo hold;
A liquid dome anchor formed in the inner hull along an opening of the liquid dome;
A secondary insulation panel for the boundary, which is supported on the liquid dome anchor and installed on the upper part of the inner hull;
A secondary inlet membrane disposed above the secondary insulation panel;
A primary insulation panel installed on the upper part of the secondary inlet membrane;
A primary susceptor installed on an upper portion of the primary insulation panel;
A primary end plate welded to an end of the primary susceptor;
A liquid dome box for sealing the opening;
A liquid dome box membrane installed on the liquid dome box;
A lower end surface of the lower dome is welded to the inner hull and an upper end surface of the lower end surface is welded to an end of the primary end plate and an end of the liquid dome box membrane, A thick sus membrane; And
A thin sus membrane attached to the upper surface of the primary end plate and the liquid dome box membrane and welded to an end of the primary end plate and an end of the liquid dome box membrane; A liquid domed membrane liquefied natural gas cargo hold insulation system. The method according to claim 1,
Wherein the thick plate member is configured to prevent thermal expansion and contraction in the Y direction. The liquid dome of the membrane type liquefied natural gas cargo hold insulation system. The method according to claim 1,
Wherein the plurality of thick plate members are arranged at regular intervals in the Y direction and the thin plate members are disposed between the spacing between the thick plate members. The method according to claim 1,
Wherein the primary susceptor has a corrugation. The liquid domes of the membrane type liquefied natural gas cargo hold insulation system. The method according to claim 1,
And a thermal insulation material is provided in a space between the secondary insulation panel and the boundary secondary insulation panel. A primary end plate welded to an end of a primary susceptor provided on an upper portion of the primary insulating panel;
A liquid dome box membrane installed on top of the liquid dome box;
A thick sus membrane disposed in a space between the liquid dome box and the primary insulation panel and welded to a bottom surface of the primary end plate and a bottom surface of the liquid dome box membrane; And
A thin sus membrane, which is welded to an upper end surface of the primary slow end plate and an upper end surface of the liquid dome box membrane; A liquid domed membrane liquefied natural gas cargo hold insulation system. A susceptor provided on an upper portion of the heat insulating panel;
An end plate welded to an end of the susceptor;
A liquid dome box membrane installed on top of the liquid dome box;
A thick plate member installed in a space between the liquid dome box and the heat insulating panel and having a lower end welded to the inner hull and an upper end welded to a lower end of the end plate and a lower end of the liquid dome box membrane, (thick sus membrane); And
A thin sus membrane disposed on the upper surface of the primary end plate and the liquid dome box membrane and welded to the upper end surface of the end plate and the upper surface of the end surface of the liquid dome box membrane; A liquid domed membrane liquefied natural gas cargo hold insulation system. The method of claim 7,
Wherein the plurality of thick plate members are arranged at regular intervals in the Y direction, and the thin plate members are disposed between the thick plate members. Installing a secondary inlet membrane and a primary secondary membrane on top of the secondary insulation panel and the primary insulation panel, respectively;
Welding a primary end plate to an end of the primary slow membrane;
Installing a liquid dome box membrane on top of the liquid dome box;
A thick sus membrane is disposed in a space between the liquid dome box and the primary and secondary thermal insulation panels, the lower end surface of the thick plate member is welded to the upper surface of the inner hull, Welding the lower end surface of the primary end plate and the lower end surface of the liquid dome box membrane to each other; And
Welding a thin sus membrane through the upper end surface of the primary end plate and the upper end surface of the liquid dome box membrane; Wherein the liquefied natural gas is introduced into the liquefied natural gas reservoir. The method of claim 9,
Wherein the thick plate member prevents thermal expansion and contraction in the Y direction. ≪ RTI ID = 0.0 > 18. < / RTI > The method of claim 9,
Wherein the plurality of thick plate members are arranged at regular intervals in the Y direction and the thin plate members are disposed between the thick plate members.

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