KR101751851B1 - Insulation System For Membrane Type in LNG Storage Tank - Google Patents

Insulation System For Membrane Type in LNG Storage Tank Download PDF

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Publication number
KR101751851B1
KR101751851B1 KR1020150152327A KR20150152327A KR101751851B1 KR 101751851 B1 KR101751851 B1 KR 101751851B1 KR 1020150152327 A KR1020150152327 A KR 1020150152327A KR 20150152327 A KR20150152327 A KR 20150152327A KR 101751851 B1 KR101751851 B1 KR 101751851B1
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South Korea
Prior art keywords
primary
insulation layer
bulkhead
membrane
heat insulating
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KR1020150152327A
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Korean (ko)
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KR20170050584A (en
Inventor
박성우
김광석
김재웅
신정섭
강중규
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대우조선해양 주식회사
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Publication of KR20170050584A publication Critical patent/KR20170050584A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/023—Modular panels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/02—Wall construction
    • B65D90/06—Coverings, e.g. for insulating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/001—Thermal insulation specially adapted for cryogenic vessels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F17C3/027—Wallpanels for so-called membrane tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F17C2203/0333—Polyurethane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0354—Wood
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0358—Thermal insulations by solid means in form of panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0631—Three or more walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0648—Alloys or compositions of metals
    • F17C2203/0651—Invar
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/228—Assembling processes by screws, bolts or rivets

Abstract

The present invention relates to a liquefied gas carrier cargo hold and a membrane-type insulation system of a liquefied gas fuel container, wherein an invar steel (Invar, 36% Ni) having a small heat shrinkage is used as the primary and secondary membranes, It has a thickness of less than 20% of the thickness of the secondary insulation layer. The secondary insulation layer is composed of glass fiber-reinforced polyurethane foam, plywood, plywood, It consists of a sandwich of composite material.

Figure R1020150152327

Description

TECHNICAL FIELD [0001] The present invention relates to an insulation system for a liquefied gas storage tank,

More particularly, the present invention relates to a membrane-type insulation system for a liquefied gas carrier vessel and a liquefied gas fuel container, and more particularly to a membrane-type insulation system for a liquefied gas carrier vessel using Invar (36% Ni) The primary insulation layer is composed of a combination of plywood, insulation, and composite material. The secondary insulation layer has a thickness of less than 20% of the thickness of the secondary insulation layer. The secondary insulation layer is made of glass fiber reinforced polyurethane foam and ply Wood or plywood and a sandwich of composite material.

In general, natural gas is transported in the form of gas through land or sea gas pipelines, or transported to a remote location where it is stored in an LNG carrier in the form of liquefied natural gas (hereinafter abbreviated as LNG) .

LNG is obtained by cooling natural gas to about -163 ° C at a very low temperature, and its volume is reduced to about 1/600 of that of natural gas, making it well suited for long distance transportation through the sea.

LNG carriers for loading LNG to the sea by loading LNG, LNG carriers for loading LNG, and LNG RV (regasification vessel) for recharging the stored LNG after unloading to natural gas, Is equipped with a cryogenic storage tank, i.e., a cargo hold, of liquefied natural gas.

Recently, there is a growing demand for floating floating structures such as LNG FPSO (floating, production, storage and offloading) and LNG FSRU (floating storage and regasification unit). LNG carrier or LNG RV A cargo hold to be installed is provided.

LNG FPSO is a floating marine structure that is used to liquefy the produced natural gas directly from the sea and store it in the cargo hold, and to transfer the LNG stored in the cargo hold to the LNG carrier if necessary.

LNG FSRU is a floating floating structure that stores LNG unloaded from an LNG cargo vessel in the sea off the sea, and then vaporizes LNG if necessary to supply it to the customer.

LNG carriers such as LNG carriers, LNG RVs, LNG FPSOs, and LNG FSRUs, which transport or store liquids such as LNG, are installed in storage structures to store LNG in cryogenic conditions.

Cargo holds can be classified into independent tanks and membrane types depending on whether the cargo load directly acts on the insulation.

Typically, the membrane type cargo holds are divided into GTT NO 96 type and TGZ Mark III type, and the independent tank type cargo hold is divided into MOSS type and IHI-SPB type.

The membrane-type cargo holds have different insulation and structure depending on the type of special metal plate. The GTT NO96 type uses a thin sheet of invar (Invar - a material with a very small thermal expansion coefficient which is mainly composed of iron and nickel) Use a thin sheet of material.

The GTT NO 96 type cargo hold is composed of a primary membrane and a secondary membrane made of Invar steel having a thickness of 0.5 to 1.5 mm, a primary insulating wall made of a plywood box and a perlite, Are alternately stacked and installed inside the hull.

The insulation system of the GTT NO 96 type cargo holds is composed of two layers of insulating steel box (36% nickel steel) and pearlite and plywood wood, and the plywood is used as the material of the insulation box.

A conventional insulation system for a liquefied gas holding window will be described below.

The insulation system of the liquefied gas hold is composed of a primary membrane and a secondary membrane made of Invar steel having a thickness of 0.5 to 0.7 mm; A primary insulation layer and a secondary insulation layer made of a plywood box and perlite; A heat insulating layer fixing unit for fixing the primary heat insulating layer and the secondary heat insulating layer; And a membrane fixing section for fixing the primary membrane and the secondary membrane.

However, in the conventional insulation system of the liquefied gas storage, there is a technical limitation in reducing the thickness of the primary insulation layer in order to maintain the insulation performance of the primary insulation layer. In other words, when the thickness of the primary heat insulating layer is made too thin, a problem arises in the heat insulating performance, and there arises a technical problem in fixing the primary heat insulating layer.

Since the thickness of the primary insulating layer can not be made thin due to the technical limit as in the conventional art, the primary insulating layer fixing portion also becomes complicated in construction, resulting in a problem that the workability of manufacturing the entire cargo hold is lowered and the manufacturing cost is increased.

U.S. Patent No. 6,035,795 U.S. Published Patent Application No. 2003-0000949 Korean Patent Publication No. 10-2000-0011347 Korean Patent Publication No. 10-2000-0011346

In order to solve the above problems, the present invention sets the thickness of the primary insulation layer within 30% of the thickness of the secondary insulation layer, and adjusts the position of the secondary insulation layer so that a relatively large load is required A primary insulation layer of a composite structure is disposed, and a primary insulation layer of the composite is arranged at a position where a relatively small load is required but a large insulation is required, thereby realizing slimming of the primary insulation layer and improving the heat insulation performance and structural rigidity And it is an object of the present invention to provide a heat insulating system for a liquefied gas holding window which can simplify the manufacturing process of a cargo hold and improve the workability and reduce the production cost.

According to an aspect of the present invention, there is provided an insulation system for a liquefied gas storage cage comprising: a secondary insulation layer for secondary insulation of a cargo hold with reference to an inner wall of a hull; A secondary membrane of an invar steel material disposed on the secondary insulation layer; A primary insulation layer disposed over the secondary membrane to primarily insulate the cargo hold; And a primary membrane of an invar steel material disposed on the primary heat insulating layer, wherein the primary heat insulating layer is composed of a composite structure in which a plurality of plywoods are laminated in the thickness direction or a plurality of plywoods and a heat insulating material And the primary insulation layer is selectively constituted of either the monolithic structure or the composite structure having different liquefied gas loads that can withstand the internal installation position of the cargo hold. The heat insulating system of the present invention is laminated in order from the inner wall of the hull (the inner wall of the tank), the secondary insulation layer, the secondary membrane, the primary insulation layer, and the primary membrane. The thickness of the primary heat insulating layer may be less than 30% of the thickness of the secondary heat insulating layer.

Wherein the primary insulation layer is located at the center of the secondary insulation layer and the four corner intersection points of the primary insulation layer adjacent to each other with respect to the four corner intersections of the primary insulation layer located at the center of the secondary insulation layer As shown in FIG.

The primary heat insulating layer may be composed of any one of the monolithic structure or the composite structure having different liquefied gas loads which can withstand the installation position of the cargo hold.

The primary insulation layer of the monolithic structure may be disposed at the top edge of the top end ground corner, the top side of the side end tongue bulkhead, and the outside of the top end ground tongue bulkhead.

The primary insulation layer of the composite structure can be placed in the center portion of the bulkhead bulkhead bulkhead, the front transverse bulkhead, the rear transverse bulkhead, a portion of the side roofing bulkhead, have.

A step (step) may be formed at the four corner intersections of the primary heat insulating layer.

The primary heat insulating layer of the composite structure may have a structure in which glass wool is inserted between upper and lower plywood.

The secondary insulation layer may be formed of a glass fiber-reinforced polyurethane foam, or a sandwich of plywood, thermal insulation, and composite structure.

The primary heat insulating layer may be arranged to cover the boundary between the secondary heat insulating layers so as to prevent the step between the secondary heat insulating layers and to prevent heat loss.

The insulation system of the liquefied gas holding window according to the present invention further includes a secondary insulation layer fixing unit for fixing the secondary insulation layer, wherein the secondary insulation layer fixing unit has a spring constant according to a deformation condition of the inner wall of the hull of the cargo hold, ) Can be set differently and fixed.

The secondary insulation layer fixing unit includes a stud bolt fixed to the inner wall of the hull where the secondary insulation layer is installed; A nut fastened to the stud bolt for securing the secondary insulation layer; An elastic body that is fitted to the stud bolt and adjusts the elasticity according to the degree of deformation of the inner wall of the hull of the secondary heat insulating layer; A compression fixing mold which is sandwiched between the stud bolts and laminated on the elastic body to prevent local damage of the secondary insulation layer; And a reference wedge for height adjustment according to the degree of deformation of the inner wall of the hull of the secondary insulation layer.

A filling plug may be installed in a space between the secondary insulation layers located above the compression fixing mold.

The adiabatic system of the liquefied gas holding window according to the present invention may further comprise a primary insulation layer fixing unit for fixing the primary insulation layer, wherein the primary insulation layer fixing unit may be configured not to penetrate the primary insulation layer . That is, the primary heat insulating layer fixing unit may be configured to be located at the four corner intersections of the four primary heat insulating layers.

Wherein the primary heat insulating layer fixing unit comprises: a support member fixed to an upper portion of the secondary heat insulating layer and having a fastening hole; A stud bolt fastened in the fastening hole and vertically installed; A metal plate sandwiched between the stud bolts and simultaneously engaging the step of the four primary heat insulating layers at corner intersections to fix the four primary heat insulating layers; A washer interposed in the stud bolt for fixing the metal plate; And a nut fastened to the stud bolt.

The insulation system of the liquefied gas holding window according to the present invention further includes a secondary membrane fixing unit for fixing the secondary membrane, wherein the secondary membrane fixing unit comprises: a tongue fixing groove formed at the upper end of the secondary insulation layer; And a tongue that engages in the tongue locking groove to secure the secondary membrane.

The insulation system of the liquefied gas holding window according to the present invention further includes a primary membrane fixing unit for fixing the primary membrane, wherein the primary membrane fixing unit comprises: a tongue fixing groove formed at the upper end of the primary insulation layer; And a tongue that engages the tongue-locking groove to secure the primary membrane.

The transverse corner portion of the cargo hold may be provided with a primary membrane or a securing invar structure connecting the secondary membrane to transmit the load of the cargo hold to the inner wall of the hull.

The fixing invar structure may be made of invar steel and may have a cross section in the form of a lattice, and the fixing invar structure may be connected to either the primary membrane or the secondary membrane of the cargo hold .

The immobilization invar structure connected to the secondary membrane is fixed to the anchor flat bar of the transverse bulkhead at the side of the transverse bulkhead of the cargo hold and is positioned horizontally and connected to the secondary membrane of the bottom roof tidal bulkhead. A bending member; A first primary bending member located at the bulkhead of the launch tank and being fixed to a lower end of the unfolded member and then bent and having an end fixed to the anchor flat bar of the transverse bulkhead; A third bending member having both ends fixed to the first bending member and the first bending member to form a grid-like invar tube space; A second primary bending member fixed at a position opposite to the first primary bending member with respect to the unfolded member; A third primary bending member fixed at a position opposite to the third bending member with respect to the unfolded member; And a fourth primary bending member fixed at a position opposite to the third bending member with respect to the first primary bending member.

A corrugated buffer member may be provided at a position connecting the secondary membrane to the fourth primary bending member and at a position connecting the secondary membrane to the third primary bending member.

Also, the immobilization invar structure connected to the primary membrane is welded to the anchor flat bar of the transverse bulkhead at the transversal bulkhead side of the cargo hold, and is horizontally connected to the primary membrane of the bulkhead bulkhead Unfolded member; A first primary bending member located at the bottom rungentural bulkhead and being fixed to a lower end of the unfolded member and then bent and having an end fixed to the anchor flat bar of the transverse bulkhead; A second primary bending member fixed at a position opposite to the first primary bending member with respect to the unfolded member; A third primary bending member welded to the first primary bending member and connected to the primary membrane of the long tank bulkhead; A first secondary bending member fixed between the second primary bending member and the non-bending member; And a fourth primary bending member fixed at a position opposite to the first secondary bending member with respect to the second primary bending member.

A corrugated buffer member may be provided at a position connecting the primary membrane and the fourth primary bending member and at a position connecting the primary membrane and the first secondary bending member.

As described above, since the thickness of the primary insulation layer is set to be within 30% of the thickness of the secondary insulation layer and the load of the liquefied gas varies depending on the installation position of the cargo hold, The heat insulating layer is disposed and the primary heat insulating layer of the composite is arranged at a position where a relatively small load is required but a large heat insulating is required, thereby realizing slimming of the primary heat insulating layer and improving the heat insulating performance and structural rigidity, It is possible to improve the workability and reduce the production cost.

1 is a perspective view showing a general liquefied gas holding window
Fig. 2 is an exploded view of the liquefied gas holding window of Fig. 1,
FIG. 3 is a cross-sectional view illustrating a part of a heat insulating system of a liquefied gas holding window according to a preferred embodiment of the present invention,
4 is a longitudinal sectional view of an adiabatic system of a liquefied gas holding window according to a preferred embodiment of the present invention
Fig. 5 is an outline drawing of Fig. 3
6 is a perspective view showing a primary insulation layer of a monolithic structure;
7 is a longitudinal sectional view showing the primary insulation layer of the monolithic structure
8 is a perspective view showing the primary insulation layer of the composite structure
9 is a longitudinal sectional view showing the primary insulation layer of the composite structure
10 is a view showing the arrangement of a primary insulation layer of a monolithic structure or a composite structure in accordance with an internal installation position of a cargo hold
11 is a view showing another example of the arrangement of the primary insulation layer of the monolithic structure or the composite structure
12 is a longitudinal sectional view showing the secondary insulation layer fixing unit
Fig. 13 is an enlarged view of A in Fig. 4
14 is an enlarged view of B in Fig. 4
15 is a view showing an immobilized invar structure having a structure connected to a secondary membrane
Fig. 16 is a cross-sectional view specifically showing the fixing invar structure of Fig. 15
Figure 17 is a cross-sectional view illustrating a securing invar structure having a structure connected to a primary membrane

Hereinafter, a heat insulating system of a liquefied gas holding window according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a perspective view showing a general liquefied gas holding window, and Fig. 2 is an exploded view showing the liquefied gas holding window of Fig. 1 developed.

1 and 2, a general liquefied gas holding window may be formed as an octagonal structure inside a hull. The bulkhead 10 and the bulkhead tundish bulkhead 20 Are arranged symmetrically.

The front transverse bulkhead 30 and the rear transverse bulkhead 40 are disposed symmetrically on the front and rear surfaces of the cargo hold. The side roof tundish bulkheads 50 and 60 are symmetrically disposed on the left and right sides of the cargo hold respectively.

A top lawn tundish corner portion 70 is provided between the top lawn tundish bulkhead 10 and the rear transverse bulkhead 40 between the top lawn tundish bulkhead 10 and the front transverse bulkhead 30. [ .

A bottom launch tundish corner portion 80 is provided between the bottom runlength tundish bulkhead 20 and the front transverse bulkhead 30 between the bottom runlength tundish bulkhead 20 and the rear transverse bulkhead 40, .

A portion of the side roof tundish bulkhead 50 and the bottom roof tundish bulkhead 20 intersect each other at a portion where the side roof tundish bulkhead 50 and the top roof tundish bulkhead 10 cross each other. A bus corner portion 90 is formed.

A portion where the side roof tibetan bulkhead 60 and the top roof tennis bulkhead 10 cross each other is formed at a portion where the side roof tennis bulkhead 10 and the side roofing tundish bulkhead 60 intersect with each other The transverse corner portion 90 is formed.

FIG. 3 is an exploded perspective view showing a part of a heat insulating system of a liquefied gas holding window according to a preferred embodiment of the present invention, FIG. 4 is a longitudinal sectional view of a heat insulating system of a liquefied gas holding window according to a preferred embodiment of the present invention, and FIG. 5 is an excerpt of the main part of FIG.

3 to 5, the liquefied gas holding window of the present invention is provided with an adiabatic system for heat insulation of liquefied gas.

The insulation system of the present invention comprises a primary insulation layer 110 disposed on the liquefied gas side of a cargo hold and primarily insulating the cargo hold, a primary membrane 120 made of Invar steel and laminated to the primary insulation layer 110, A secondary insulation layer 130 disposed between the secondary insulation layer 110 and the inner wall 1 of the ship and secondary insulation of the cargo window, a secondary membrane 140 made of Invar steel and laminated to the secondary insulation layer 130, A first insulating layer fixing unit 150 for fixing the primary insulating layer 110, a secondary insulating layer fixing unit 160 for fixing the secondary insulating layer 130, a primary insulating layer fixing unit 160 for fixing the primary insulating layer 110, A membrane anchoring unit 170, and a secondary membrane anchoring unit 180 for securing the secondary membrane 140. The insulation system of the present invention is stacked (arranged) in the order of the secondary insulation layer 130, the secondary membrane 140, the primary insulation layer 110, and the primary membrane 120 from the reference to the inner wall 1 of the hull .

In the adiabatic system of the liquefied gas holding window according to the preferred embodiment of the present invention, the thickness of the first heat insulating layer 110 is less than 30% of the thickness of the second heat insulating layer 130, Structure.

That is, the thickness of the first heat insulating layer 110 may be less than 30%, preferably 10-20% of the thickness of the second heat insulating layer 130, and the first heat insulating layer 110 (110a, 110b) A composite structure composed of a single structure in which plywood is laminated in the thickness direction or a plurality of plywoods and a heat insulating material such as glass wool and a heat insulating material having a density of 40 to 50 kg / m 3 of a low density polyurethane foam material . Here, for the sake of convenience, the insulation layer 110a of the monolithic structure and the first insulation layer 110b of the composite structure of the first insulation layer 110 are denoted by reference numerals.

FIG. 6 is a perspective view showing a primary insulation layer of a monolithic structure, and FIG. 7 is a vertical sectional view showing a monolithic primary insulation layer.

6 and 7, the primary insulation layer 110a having a single structure may be formed in a structure in which a plurality of sheet-like plywoods, for example, four sheets of plywood are laminated in the thickness direction. The primary insulating layer 110a of the monolithic structure may have a step 111 formed at four corner intersections.

Fig. 8 is a perspective view showing a primary insulation layer of the composite structure, and Fig. 9 is a longitudinal sectional view showing a primary insulation layer of the composite structure.

8 and 9, the primary insulation layer 110b of the composite structure may be formed in a structure in which sheet-shaped plywood is laminated on the upper and lower sides in the thickness direction, and a heat insulating material is provided between the plywoods . The first insulating layer 110b of the composite structure may have a step 111 at four corner intersections.

On the other hand, liquid gas (LNG) contained in the cargo hold insulation system is operated in a full or almost empty condition. When the cargo is full, the cargo hold inner surface receives the hydrostatic pressure of the liquid cargo (+ acceleration of the ship) . The maximum static load is 2 ~ 3 bar. However, it is preferable that the surface located on the upper side of the cargo hold is reinforced at the portion where the sloshing load acts, because the impact force of the liquid cargo acts on the inner surface due to the shaking of the liquid cargo.

10 is a view showing an example of the arrangement of the primary insulation layer of the single structure or the composite structure according to the internal installation position of the cargo hold.

As shown in FIG. 10, the arrangement of the primary insulating layer 110 can be set differently according to the position of the cargo hold. That is, the primary insulation layer 110a having a monolithic structure or the primary insulation layer 110b having a composite structure can be selectively disposed according to the internal installation position of the cargo hold.

Is limited to the LNG carrier shown in FIG. 10, and is limited to the case where there is a load height limitation of liquid cargo.

The monolithic primary insulation layer 110a may be disposed on the top surface of the top rung tundish corner portion 70, the top surface of the side roof tundish bulkhead 50, and the top roof tundish bulkhead 10 .

The primary insulation layer 110b of the composite structure is disposed on the upper side of the bulkhead bulkhead 20, the front transverse bulkhead 30, the rear transverse bulkhead 40 and the side roofing bulkhead 50 The side roofing bulkhead 60, and the top roofing bulkhead 10, as shown in FIG.

11 is a view showing another example of the arrangement of the primary insulation layer of the monolithic structure or the composite structure.

Referring to FIG. 11, it is preferable to reinforce the entire area excluding the bottom of the cargo hold when there is no restriction on the stacking height of liquid cargoes such as LNG FSRU, LNG FPSO, LNG Fuel Tank, LNG Bunkering Vessel, That is, the bulkhead bulkhead bulkhead 20 may be provided with a primary insulation layer 110a of a monolithic structure, and the remaining primary bulkheads 10, 30-80 may be provided with a primary insulation layer 110b of a composite structure .

4 to 6, the arrangement structure of the primary insulation layer 110 and the secondary insulation layer 130 will be described in more detail as follows.

The primary insulation layer 110 is positioned at the center of the secondary insulation layer 130 and the four primary insulation layers 110 adjacent to each other at four corners of the primary insulation layer 110 located at the center of the outer periphery of the secondary insulation layer 140 And four corner intersection points between the insulating layers 110 are formed.

The primary heat insulating layer 110 is disposed in a manner to cover the boundary between the secondary heat insulating layers 130, thereby preventing the step between the secondary heat insulating layers 130 and preventing heat loss. Here, the boundary between the secondary insulation layers 130 refers to a gap (or a gap) between the adjacent secondary insulation layers 130.

The secondary insulation layer 130 may be formed of a glass fiber reinforced polyurethane foam or a sandwich of plywood, insulation, and composite structures.

12 is a vertical sectional view showing the secondary insulation layer fixing unit.

Referring to FIG. 12, the secondary insulation securing unit 160 can be fixed by setting different spring constants according to the deformation conditions of the inner wall 1 of the hull of the cargo hold. A stud bolt 161, a nut 162, a washer spring 163, a compression fixation mold 164, and a reference wedge 165, . ≪ / RTI >

In other words, the stud bolt 161 is fixed to the inner wall 1 of the hull where the secondary insulation layer 130 is installed. The fixing method of the stud bolt 161 can be fixed by a usual fastening means, for example, welding.

A nut 162 is fastened to the stud bolt 161 for securing the secondary insulation layer 130.

The washer spring 163 is fitted in the stud bolt 161 and is configured to adjust the elasticity of the secondary insulation layer 130 in accordance with the degree of deformation of the inner wall 1 of the hull. In order to adjust the elasticity, the elastic body 163 may be replaced with a three-stage or five-stage stage.

The compression fixing mold 164 is configured to be stacked on the elastic body 163 by being fitted in the stud bolt 161 to prevent local damage of the secondary insulation layer 130. High density PUF, compressed wood and the like can be used.

A reference wedge 165 is fixed to the hull inner wall 1 and a stud bolt 161 is vertically fixed to the reference plate 165. The reference plate 165 is configured to adjust the height according to the degree of deformation of the inner wall 1 of the secondary insulation layer 130.

The filling plug 166 is installed on the upper portion of the compression fixing mold 164 and the filling plug 166 fills the through hole H where the stud bolt 161 is provided to prevent the secondary heat insulating layer 130 from being damaged .

13 is an enlarged view of a portion A in Fig.

Referring to FIG. 13, the primary insulation securing unit 150 may be configured not to pass through the primary insulation layer 110, but may include four primary insulation layers 110 adjacent to each other. At four corner intersections.

That is, the primary heat insulating layer fixing unit 150 includes, for example, a stud bolt 151, a base socket 152, a setting plate 153, a nut 154, and a washer 155 .

The construction of the primary insulation layer fixing unit 150 will be described in more detail as follows.

A hole H formed in a central portion of the secondary insulation layer 130 may be used to fix the primary insulation layer 110. A lower end of the base socket 152 may be formed in the through- And the upper end of the support portion 152 may be fixed to the upper portion of the secondary insulation layer 130 with a rivet (or a screw) R. A fastening hole 152a may be formed in the support portion 152 for fixing the rivet or the screw. A second membrane 140 is located on the support 152.

The stud bolt 151 is fastened in the fastening hole 152a of the support part 152. The fastening hole 152a has a female screw part formed on the inner circumferential surface of the fastening hole 152a for fastening the stud bolt 151, A male screw portion may be formed on the outer peripheral surface of the bolt 151. The fastening structure between the female screw part and the male screw part is not shown in the drawings because it corresponds to a technique common to the public.

The setting plate 153 has a rectangular shape and simultaneously engages the steps 111 of the four primary heat insulating layers 110 at the corner intersections to fix the four primary heat insulating layers 110.

A nut 154 is fastened to the stud bolt 151 via a washer 155 to fix the metal plate 153. The washer 155 serves to uniformize the fastening force when the nut 154 is fastened to the metal plate 153.

A fill plug 156 is positioned on the metal plate 153 and a plywood is positioned on the fill plug 156 at the same height as the level of the first heat insulating layer 110.

FIG. 14 is an enlarged view of FIG. 4B.

14, the secondary membrane securing unit 180 includes a tongue securing groove 181 formed at the upper end of the secondary insulation layer 130, and a secondary membrane securing groove And a tongue 182 that engages the tongue-locking groove 181 to secure the tongue 140 in place.

14, the primary membrane securing unit 170 includes a tongue fixing groove 171 formed at an upper end of the primary heat insulating layer 110, And a tongue 172 which engages in a tongue-fixing groove 171 for fixing.

The insulation system according to the present invention is characterized in that the transversal corner portion 90 of the cargo hold is provided with a fixing for connecting the secondary membrane 140 or the primary membrane 120 to transmit the load of the cargo hold to the inner wall 1 of the ship, Structure 190 (290).

The fixing invar structures 190 and 290 are made of invar steel and can have a cross section in the form of a lattice.

The fixing invar structures 190 and 290 may be a structure connected to the secondary membrane 140 of the cargo hold (see FIGS. 15 and 16) or a structure connected to the primary membrane 120 (see FIG. 17) .

Hereinafter, the fixing invar structure will be described in detail.

FIG. 15 is a view showing an immersion structure for fixing connected to a secondary membrane, and FIG. 16 is a specific sectional view showing a immersion structure for immobilization.

15 and 16, the fixing invar structure 190 includes a non-folding member 191, a first primary bending member 192, a tertiary bending member 193, a second primary bending member 194, A third primary bending member 195, and a fourth primary bending member 196. The fixing of these members can use conventional fastening means, such as seam welding.

The unfolded member 191 is fixed to the anchor flat bar 91 of the transverse bulkhead 90 at the side of the transverse bulkhead 90 of the cargo hold and is positioned in the horizontal direction, And is connected to the secondary membrane 140.

The first primary bending member 192 is located at the bulkhead of the longitudinals and is fixed to the lower end of the unfolded member 191 and then bent and fixed to the anchor flat bar 92 of the transverse bulkhead 90 do.

Both ends of the third bending member 193 are fixed to the first bending member 191 and the first bending member 192, respectively, to form a grid-like invava tube space.

The second primary bending member 194 is fixed at a position opposite to the first primary bending member 192 with respect to the unfolded member 191. [

The third primary bending member 195 is fixed at a position opposite to the third bending member 193 with respect to the non-bending member 191. [

The fourth primary bending member 196 is fixed at a position facing the tertiary bending member 193 with respect to the first primary bending member 192.

When the deformation of the secondary membrane is large at a position connecting the secondary membrane 140 and the fourth primary bending member 196 and at a position connecting the secondary membrane 140 and the third primary bending member 195 A corrugated buffer member B may be provided.

Meanwhile, FIG. 17 is a cross-sectional view showing an immobilization envelope structure having a structure connected to the primary membrane.

17, the fixing invar structure 290 according to another exemplary embodiment of the present invention is connected to the primary membrane 120 and includes an unfolded member 291, a first primary bent member 292, a second primary bending member 293, a third primary bending member 294, a fourth primary bending member 296, and a first secondary bending member 295. The fixing of these members can use conventional fastening means, such as seam welding.

The unfolded member 292 is welded to the anchor flat bar 91 of the transverse bulkhead 90 at the transverse bulkhead 90 of the cargo hold and is positioned horizontally to receive the primary And is connected to the membrane 120.

The first primary bending member 292 is located at the bottom launching tundinal bulkhead 90 and is fixed at the lower end of the unfolded member 292 and then bent. And is fixed to the flat bar 92.

The second primary bending member 293 is fixed at a position opposite to the first primary bending member 292 with respect to the non-bending member 291.

The third primary bending member 294 is welded to the first primary bending member 292 and then connected to the primary membrane 120 of the bulkhead bulkhead 20.

The first secondary bending member 295 is fixed between the third primary bending member 294 and the unfolded member 292.

The fourth primary bending member 296 is fixed at a position opposite to the first secondary bending member 295 with respect to the third primary bending member 294.

When the deformation of the primary membrane is large at a position connecting the primary membrane 120 and the third primary bending member 294 and at a position connecting the primary membrane 120 and the fourth primary bending member 296 A corrugated buffer member B may be provided.

The operation and effect of the insulation system of the liquefied gas holding window constructed as described above will be described as follows.

4, the adiabatic system according to a preferred embodiment of the present invention includes a secondary insulation layer 130, a secondary membrane 140, a primary insulation layer 110, and 1 And the car membrane 120 are sequentially stacked.

In the adiabatic system according to the preferred embodiment of the present invention, the thickness of the first heat insulating layer 110 is less than 30% of the thickness of the second heat insulating layer 130, and the first heat insulating layer 110 is composed of a single structure or a composite structure .

The thickness of the primary insulation layer is designed to be thin, so that the thickness of the primary insulation layer remains constant even if the total insulation thickness of the insulation system changes. Because of the thin primary insulation layer, it is possible to achieve economical efficiency such as weight reduction and fabrication and installation.

In the adiabatic system according to the preferred embodiment of the present invention, the degree of load can be set differently in the arrangement of the first heat insulating layer 110. [ That is, the primary insulation layer 110a having a monolithic structure or the primary insulation layer 110b having a composite structure can be selectively disposed in consideration of a load that can withstand an internal installation position of the cargo hold.

The primary insulation layer 110a having a monolithic structure in which the thickness of the primary insulation layer 110 is less than 30% of the thickness of the secondary insulation layer 130 and the liquefied gas load, which can withstand the installation position of the cargo window, Or the primary heat insulating layer 110b of the composite structure are appropriately disposed, lightness and slimness can be realized, and structural rigidity and heat insulation performance can be improved.

3 to 5, in the adiabatic system according to the preferred embodiment of the present invention, the primary insulation layer 110 is disposed to cover the boundary between the secondary insulation layers 130, 130 and the heat loss can be effectively blocked.

12, in the adiabatic system according to the preferred embodiment of the present invention, the secondary insulation securing 160 fixes the spring constant of the cargo hold according to the deformation condition of the inner wall 1 of the hull. ) Can be set differently and fixed.

That is, in order to control the elasticity, the elastic body 163 can be appropriately changed according to the design conditions in three or five stages. The reference wedge 165 is fixed to the hull inner wall 1 and the stud bolt 161 is vertically fixed to the reference plate 165. The reference bolt 161 is fixed to the hull inner wall 1 of the secondary heat insulating layer 130, The height can be adjusted according to the degree of deformation. Although not shown in the drawing, the reference wedge 165 may be integrally formed with the stud bolt 161.

Referring to FIG. 13, in the adiabatic system according to the preferred embodiment of the present invention, the primary insulation securing unit 150 has an effect of not passing through the primary insulation layer 110 . That is, a through hole (hole) H formed in the center of the secondary heat insulating layer 130 can be utilized to fix the primary heat insulating layer 110. A rectangular setting plate 153 can be used as a corner crossing And simultaneously fixes the four primary heat insulating layers 110 by being engaged with the steps 111 of the four primary heat insulating layers 110 at the same time. The washer 155 serves to uniformize the fastening force when the nut 154 is fastened to the metal plate 153.

15 to 17, in the adiabatic system of the present invention, in order to transmit the load of the cargo hold to the inner wall 1 of the ship at the transverse corner portion 90 of the cargo hold, the secondary membrane 140 or 1 And a fixing invar structure 190 (290) for connecting the car membrane 120 are provided.

In the adiabatic system according to the present invention, since the thickness of the primary insulation layer 110 is less than 30% of the thickness of the secondary insulation layer 130, the immersion structure for fixing the primary membrane and the secondary membrane to the inner wall of the hull an anchoring invar structure may be improved to a simple structure connected to a membrane of either a primary membrane or a secondary membrane instead of a structure connected to both the primary membrane and the secondary membrane. Because of this technical feature, it is possible to install only one welding at each installation surface in a narrow space when installing the immobilization inverting structure, and it is possible to manufacture by sewing welding at a relatively high welding speed. Therefore, It is possible to smoothly perform the function while facilitating the operation.

As described above, the present invention relates to a fixing method for a primary insulating layer of an adiabatic system, wherein the primary insulating layer is a lightweight insulating layer having a thin thickness compared to a secondary insulating layer, and can simplify a structure capable of fixing the primary insulating layer And the fixing structure may be formed in a form that penetrates the secondary membrane or does not penetrate the secondary membrane, and the fixing structure may be provided by using the penetrated portion to fix the secondary insulation layer. The fixed structure passing through the membrane located at the center of one secondary insulation layer is fixed at the intersection of the four corners of the primary insulation layer. The fixed structure passes through the secondary membrane, A stud bolt connected to the support, a metal plate member capable of fixing the intersection of four corners of the primary heat insulating layer, a nut capable of fixing the metal plate member, and a metal plate as a nut It is composed of a washer which can make the clamping force uniform when it is fixed. In the upper part of the fixed structure, there are inserted type insulator which can fill space generated when the primary membrane is installed, A plywood cover is installed.

According to the present invention, the thickness of the primary insulation layer is set to be within 30% of the thickness of the secondary insulation layer, and the primary insulation layer of the monolithic structure or the composite structure is appropriately set according to the internal installation position of the cargo hold in accordance with the liquefied gas load, It is possible to improve the heat insulating performance and the structural rigidity while simplifying the manufacturing process of the cargo hold, thereby greatly reducing the production cost.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Various modifications and variations are possible within the scope of equivalents. For example, the adiabatic system of the present invention is not limited to a cargo hold of a liquefied gas carrier and may be equally applicable to both storage tanks for storing liquefied gas.

The primary insulating layer 110 of the present invention is equally applicable to the transverse corner portion 90 and the longitudinals corner portions 70 and 80 as well as the flat portion 10-60 of the cargo hold.

1: inner hull
110: primary insulating layer
110a: primary insulating layer
110b: primary insulation layer of the composite structure
111: step
120: primary membrane
130: secondary insulation layer
140: Secondary membrane
150: Primary insulation layer fixing unit
151: Stud bolt
152: Base socket
152a: fastening hole
153: Setting Plate
154: Nut
155: Washer
160: Secondary insulation layer fixing unit
161: stud bolt
162: nut
163: Elastomer
164: Mold for fixing compression
165: reference wedge
166: Filling plug
170: primary membrane fixed unit
171: Tongue fixing groove
172: Tongue
180: Secondary membrane fixation unit
181: Tongue fixing groove
182: Tongue
190: Fixed Invar Structure
191: no bending member
192: first bending member
193: Third bending member
194: second primary bending member
195: third bending member
196: Fourth primary bending member
B: corrugated buffer member
H:
R: Rivet

Claims (30)

A secondary insulation layer for secondary insulation of the cargo hold with respect to the inner wall of the hull;
A secondary membrane of an invar steel material disposed on the secondary insulation layer;
A primary insulation layer disposed over the secondary membrane to primarily insulate the cargo hold; And
And a primary membrane of an invar steel material disposed on the primary heat insulating layer,
The primary insulation layer is composed of a composite structure in which a plurality of plywoods are laminated in a thickness direction or a plurality of plywoods and a heat insulating material,
Wherein the primary insulation layer is selectively formed of either the monolithic structure or the composite structure having different liquefied gas loads that can withstand the internal installation position of the cargo hold,
Wherein the primary insulation layer of the monolithic structure has a step formed at four corner intersection points. The method according to claim 1,
Wherein the thickness of the first heat insulating layer is less than 30% of the thickness of the second heat insulating layer. The method according to claim 1,
Wherein the primary insulation layer is located at the center of the secondary insulation layer and the outer edge of the secondary insulation layer is located at the four corner intersection points of the four primary insulation layers adjacent to each other on the basis of the four corner intersections of the primary insulation layer, Is formed so as to form a gas-liquid separator. The method according to claim 1,
If there is a limit to the stacking height of the liquid cargo, the primary insulation layer of the monolithic structure is disposed at the corner of the top roof tin corners, the top side of the side roof tile bulkhead, and the outside of the top roof tile bulkhead,
The primary insulation layer of the composite structure may be any of a variety of materials including, but not limited to, a bottom longevity tundish bulkhead, a front transverse bulkhead, a rear transverse bulkhead, an upper portion of a side longevity tundish bulkhead, a side longevity tundish bulkhead, Wherein the head is disposed at a central portion of the head. The method according to claim 1,
In the case where there is no restriction on the stacking height of the liquid cargo, the bulkhead bulkhead (bulkhead) 20 is provided with a primary insulation layer 110a of a monolithic structure and a composite insulating primary layer 110b ) Is disposed on the side of the liquefied gas holding window. delete The method according to claim 1,
Wherein the primary insulation layer of the composite structure has a structure in which a heat insulating material is inserted between upper and lower plywoods. The method according to claim 1,
Wherein the secondary insulation layer is formed of a polyurethane foam reinforced with glass fiber or a sandwich of a plywood, an insulation, and a composite material structure. The method according to claim 1,
Wherein the primary insulation layer is applied to the flat portion of the cargo hold and the transverse corner portion and the roofing corner portion in the same manner. The method according to claim 1,
Wherein the primary insulation layer is disposed so as to cover a boundary portion between the secondary insulation layers so as to prevent a step between the secondary insulation layers and to prevent heat loss. A secondary insulation layer for secondary insulation of the cargo hold with respect to the inner wall of the hull;
A secondary membrane of an invar steel material installed in the secondary insulation layer;
A primary insulation layer installed at a position covering the secondary membrane to primarily insulate the cargo hold;
A primary membrane of an invar steel material installed in the primary heat insulating layer; And
And a secondary insulation layer fixing unit for fixing the secondary insulation layer,
The primary insulation layer is composed of a composite structure in which a plurality of plywoods are laminated in a thickness direction or a plurality of plywoods and a heat insulating material,
Wherein the secondary insulation layer fixing unit is fixed by setting a spring constant differently according to a deformation condition of the inner wall of the hull of the cargo hold,
The secondary insulation layer fixing unit
A stud bolt fixed to the inner wall of the hull on which the secondary heat insulating layer is installed;
A nut fastened to the stud bolt for securing the secondary heat insulating layer;
An elastic body that is fitted to the stud bolt and adjusts the elasticity according to the degree of deformation of the inner wall of the hull of the secondary heat insulating layer;
A compression fixing mold which is sandwiched between the stud bolts and laminated on the elastic body to prevent local damage of the secondary insulation layer; And
A reference plate for height adjustment according to a degree of deformation of the inner wall of the hull of the secondary heat insulating layer; Wherein the liquefied gas is discharged from the liquefied gas storage vessel. delete The method of claim 11,
And a filling plug is installed in a space between the secondary insulation layers located above the compression fixing mold. The method of claim 11,
Further comprising a primary insulation layer fixing unit for fixing the primary insulation layer,
Wherein the primary heat insulating layer fixing unit is configured not to pass through the primary heat insulating layer. 15. The method of claim 14,
Wherein the primary insulation layer fixing unit is located at four intersection points of the four primary insulation layers. 16. The method of claim 15,
The primary heat insulating layer fixing unit includes:
A support fixed to an upper portion of the secondary insulation layer and having a fastening hole;
A stud bolt fastened in the fastening hole and vertically installed;
A metal plate sandwiched between the stud bolts and simultaneously engaging the step of the four primary heat insulating layers at corner intersections to fix the four primary heat insulating layers;
A washer interposed in the stud bolt for fixing the metal plate; And
And a nut fastened to the stud bolt. The method of claim 11,
Further comprising a secondary membrane fixation unit for securing the secondary membrane,
The secondary membrane fixation unit
A tongue fixing groove formed at an upper end of the secondary heat insulating layer; And
And a tongue engaging with said tongue fixing groove to secure said secondary membrane. The method of claim 11,
Further comprising a primary membrane anchoring unit for securing the primary membrane,
The primary membrane anchoring unit
A tongue fixing groove formed at an upper end of the primary heat insulating layer; And
And a tongue engaging said tongue-locking groove to secure said primary membrane. The method according to claim 1,
Wherein the transverse corner of the cargo hold is provided with a retaining structure for transferring the load of the cargo hold to the inner wall of the ship. The method of claim 19,
Characterized in that the fixture-in-bar structure is made of Invar steel and has a cross-section in the form of a lattice. The method of claim 20,
Characterized in that the fixing invar structure is connected to either the primary membrane or the secondary membrane of the cargo hold. 23. The method of claim 21,
The fixation invar structure
A unfolded member fixed to the anchor flat bar of the transverse bulkhead at the side of the transverse bulkhead of the cargo hold and connected to the secondary membrane of the long tank bulkhead by being positioned horizontally;
A first primary bending member which is located on the bulkhead side of the launch tank and is fixed to the lower end of the unfolded member and then bent and whose end is fixed to the anchor flat bar of the transverse bulkhead;
A third bending member having both ends fixed to the first bending member and the first bending member to form a grid-like invar tube space;
A second primary bending member fixed at a position opposite to the first primary bending member with respect to the unfolded member;
A third primary bending member fixed at a position opposite to the third bending member with respect to the unfolded member; And
And a fourth primary bending member fixed at a position opposite to the third bending member with respect to the first primary bending member. 23. The method of claim 22,
And a corrugated buffering member is provided at a position connecting the secondary membrane to the fourth primary bending member and at a position connecting the secondary membrane to the third primary bending member. system. 23. The method of claim 21,
The fixation invar structure
A unfolded member welded to the anchor flat bar of the transverse bulkhead at the transversal bulkhead side of the cargo hold and positioned in a horizontal direction and connected to the primary membrane side of the bulkhead bulkhead;
A first primary bending member located at the bulkhead of the launch tank and bent at the lower end of the unfolded member and bent at an end thereof to the anchor flat bar of the launch tank;
A second primary bending member fixed at a position opposite to the first primary bending member with respect to the unfolded member;
A third primary bending member welded to the first primary bending member and connected to the primary membrane of the long tank bulkhead;
A first secondary bending member fixed between the second primary bending member and the non-bending member; And
And a fourth primary bending member fixed at a position opposite to the first secondary bending member with respect to the second primary bending member. 27. The method of claim 24,
Wherein a corrugated buffer member is provided at a position connecting the primary membrane and the fourth primary bend member and at a position connecting the primary membrane and the first secondary bend member. system. A primary heat insulating layer disposed on the liquefied gas side; A primary membrane laminated on the primary insulation layer; A secondary insulation layer disposed between the primary insulation layer and the inner wall of the hull to secondaryly insulate the cargo hold; And a secondary membrane laminated on the secondary insulation layer,
The primary heat insulating layer is composed of a single structure in which a plurality of plywoods are laminated in the thickness direction or a composite structure in which a plurality of plywoods are laminated in the thickness direction and a heat insulating material is provided between the plywoods,
Wherein the primary insulation layer of the monolithic structure has a step formed at four corner intersection points. 27. The method of claim 26,
Wherein the primary insulation layer is composed of the monolithic structure or the composite structure according to an internal installation position of the cargo hold so that the load of the liquefied gas can be varied. 28. The method of claim 27,
The primary insulation layer of the monolithic structure is disposed at the corner of the top rung tundish, the top side of the side rung tundal bulkhead, and the outside of the top rung tundal bulkhead,
The primary insulation layer of the composite structure may be any of a variety of materials including, but not limited to, a bottom longevity tundish bulkhead, a front transverse bulkhead, a rear transverse bulkhead, an upper portion of a side longevity tundish bulkhead, a side longevity tundish bulkhead, Wherein the head is disposed at a central portion of the head. delete 27. The method of claim 26,
Wherein the primary insulation layer of the composite structure has a structure in which a heat insulating material is inserted between upper and lower plywoods.
KR1020150152327A 2015-10-30 2015-10-30 Insulation System For Membrane Type in LNG Storage Tank KR101751851B1 (en)

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KR20200042976A (en) * 2018-10-16 2020-04-27 대우조선해양 주식회사 Insulation Structure of Membrane Type Liquefied Natural Gas Storage Tank

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KR102095427B1 (en) * 2018-08-28 2020-03-31 대우조선해양 주식회사 Insulation system for natural gas cargo of carrier and liquefied natural gas fuel tank
KR102490345B1 (en) * 2018-10-29 2023-01-20 대우조선해양 주식회사 Liquefied natural gas cargo insulation system
KR102248137B1 (en) * 2019-12-10 2021-05-04 한국가스공사 Corner structure of liquefied gas storage tank
CN116857543B (en) * 2023-09-04 2023-11-07 中太(苏州)氢能源科技有限公司 Enclosure system for low-temperature storage tank and mounting process thereof

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