KR20230018986A - Liquefied gas storage tank and vessel comprising the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and a ship including the same. The liquefied gas storage tank of the present invention is composed of a wall consisting of front, back, left, right, upper, and lower surfaces and multiple corner surfaces and has an octagonal vertical cross-section and a square horizontal cross-section. Regarding an inclined corner bending point where one of the upper, lower, left, and right surfaces is connected to each of the multiple corner surfaces, the angle ß of each of the multiple corner surfaces is determined at the inclined corner bending point by setting each angle of the front and back surfaces. The distance X between the outermost wrinkles of each of the left, right, upper, and lower surfaces, which are formed in parallel and closest to the inclined corner bending point, and the inclined corner bending point is expressed in the formula X = {1 + 1/(n + 1)} ＊ 360 ＊ tan{90 - (ß/2)}. The distance Y between the inclined corner bending point and the outermost wrinkles of each of the multiple corner surfaces, which are formed in parallel and closest to the inclined corner bending point, may be determined to be equal to the distance X. Accordingly, the man-hours of designing and manufacturing a corner panel can be reduced.

Description

Liquefied gas storage tank and vessel comprising the same}

The present invention relates to a liquefied gas storage tank and a ship including the same.

According to recent technology development, liquefied natural gas (LNG) and liquefied petroleum gas (LPG) have been widely used to replace gasoline or diesel.

LNG carriers that transport or store liquefied gas such as LNG at sea, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), LNG FSRU (Floating Storage and Regasification Unit), etc. A storage tank (so-called "cargo hold") is installed for storage in a cryogenic liquid state.

This liquefied gas storage tank is composed of a primary barrier, a primary thermal insulation wall, a secondary barrier, and a secondary thermal insulation barrier, and since boil off gas (BOG) may be generated by heat intrusion from the outside, the thermal insulation design It is the core technology of liquefied gas storage tank design to lower the Boil Off Rate (BOR), which is the vaporization rate of boil-off gas. In addition, since the liquefied gas storage tank is exposed to various loads such as sloshing, it may be essential to secure the mechanical strength of the insulation panel.

Considering this point, the thickness range of the primary insulation wall and the secondary insulation wall may be related to the mechanical strength of the liquefied gas storage tank. Accordingly, studies are being actively conducted to maintain the mechanical strength of the secondary barrier while eliminating the low-temperature burden of the secondary barrier.

In addition, the liquefied gas storage tank is made of a wall to which the front, rear, left, right, upper, lower and four corner surfaces are connected, and has an octagonal vertical cross section and a square horizontal cross section shape, wherein either the front or rear surface A right angle corner bending point where each of the left, right, top, bottom and multiple corner surfaces are connected, and an inclined corner bending point where any one of the top, bottom, left and right surfaces and multiple corner surfaces are connected. is formed

Each surface forming the wall is provided to face the liquefied gas, and a primary barrier is formed with a plurality of grid-shaped wrinkles at a constant pitch. A plurality of corrugations of the primary barrier are arranged to face right angle corner bending points and inclined corner bending points.

However, in the existing liquefied gas storage tank, the first interval between the outermost crease and the inclined corner bending point of the left, right, upper and lower surfaces, and the first distance between the outermost wrinkle and the inclined corner bending point of each of the four corner surfaces Since the two intervals are not symmetrical, there is a problem in that a lot of man-hours are required in designing and manufacturing the corner panel.

In addition, in the existing liquefied gas storage tank, horizontal and vertical wrinkles on the front, rear, left, right, upper and lower surfaces are formed at the same regular pitch, but any one of the horizontal and vertical wrinkles on the four corner surfaces is formed with a regular pitch and the other is formed with an irregular pitch having a smaller size than the regular pitch, so it is necessary to increase the area of the regular pitch as much as possible to reduce cost and man-hours.

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is the first interval between the outermost wrinkles and the inclined corner bending points of the left, right, upper and lower surfaces constituting the wall, By making the single leg part symmetrical by making the second interval between the outermost wrinkles and the inclined corner bending point of each of the four corner surfaces constituting the wall the same, the man-hours of designing and manufacturing the corner panel can be reduced. To provide a liquefied gas storage tank and a ship including the same.

In addition, another object of the present invention is to arrange all the wrinkles on the left, right, upper and lower surfaces of the wall, all the wrinkles on a plurality of corner surfaces of the wall, and most of the wrinkles on the front and back surfaces of the wall at the same regular pitch. By forming and configuring to form an irregular pitch different from the regular pitch only on the remaining parts of the front and back surfaces, it is possible to minimize the arrangement area of the irregular pitch, thereby minimizing the cost and man-hours of manufacturing and installing the primary barrier in which a number of wrinkles are formed. To provide a liquefied gas storage tank and a ship including the same that can reduce

A liquefied gas storage tank according to an aspect of the present invention is composed of a wall composed of a front, a rear surface, a left surface, a right surface, an upper surface, a lower surface, and a plurality of corner surfaces, and stores liquefied gas having an octagonal vertical section and a square horizontal section shape. A tank, wherein each of the front surface, the rear surface, the left surface, the right surface, the upper surface, the lower surface, and the plurality of corner surfaces includes at least one insulating wall; A barrier provided to face the liquefied gas inside the heat insulating wall and having a plurality of grid-shaped wrinkles formed at a predetermined pitch; a right angle corner bending point at which any one of the front and rear surfaces is connected to each of the left surface, the right surface, the upper surface, the lower surface, and the plurality of corner surfaces; And an inclined corner bending point at which any one of the upper surface, the lower surface, the left surface and the right surface is connected to each of the plurality of corner surfaces, and for the inclined corner bending point, each of the front and rear surfaces The angle 'ß' of each of the plurality of corner surfaces is determined at the inclined corner bending point by setting the angle, and the left surface, the right surface, the upper surface, and the lower surface are formed most adjacently and side by side from the inclined corner bending point, respectively. The distance 'X' between the outermost fold of and the inclined corner bending point is determined by the formula "X = {1 + 1/(n + 1)} * 360 * tan{90 - (ß/2)}" , The distance 'Y' between the outermost wrinkle of each of the plurality of corner surfaces formed side by side and closest to the inclined corner bending point and the inclined corner bending point may be determined to be the same as the distance 'X'.

Specifically, between the determination of the corner surface angle 'ß' and the determination of the distance 'X', the left surface, the right surface, and the plurality of corner surfaces, respectively, among the plurality of wrinkles on the front and rear surfaces, respectively. Arrange a plurality of horizontal wrinkles facing the plurality of corner surfaces at a pitch 'a', so that the ends of each of the plurality of horizontal wrinkles facing the plurality of corner surfaces are connected to the plurality of wrinkles formed on the plurality of corner surfaces near the right angle corner bending point. It is determined to be bent at right angles to the right angle corner bending point and extended to the right angle corner bending point, and among the plurality of wrinkles of each of the plurality of corner surfaces, a plurality of wrinkles directed toward the front surface and the rear surface are selected from the front surface and the rear surface. After arranging with a pitch 'bb' so as to be connected to the ends of each of the extended horizontal wrinkles, further arranging wrinkles at a portion obtained by dividing the pitch 'bb' of the wrinkles formed on the plurality of corner surfaces by 1/2, A plurality of wrinkles on each of the plurality of corner surfaces are determined to have a pitch 'b', and among the plurality of wrinkles on the front and rear surfaces, a plurality of vertical wrinkles directed toward each of the upper surface, the lower surface, and the plurality of corner surfaces are pitched. It may be arranged as 'a', but it may further include determining that the finishing point coincides with the extension line of the center obtained by dividing the pitch 'bb' of the wrinkles formed on the plurality of corner surfaces by 1/2.

Specifically, when the interval 'X' is a prime number or an irrational number, it is adjusted to an integer and is determined as an interval 'X1', and the interval 'Y' is a predetermined formula to newly define a relationship with the interval 'X1' The interval 'Y1' can be calculated using

Specifically, when the interval 'X' is a prime number or an irrational number, it is adjusted to an integer and is determined as an interval 'X1', and the interval 'Y1' has a difference value between the interval 'X1' and a preset error, and , the predetermined error may be within 1 mm.

Specifically, each of the left surface, the right surface, the upper surface, and the lower surface has a plurality of wrinkles formed at a pitch 'a', and each of the front and rear surfaces has a plurality of wrinkles formed at a pitch 'a'. In each of the plurality of corner surfaces, a plurality of wrinkles toward the left surface, the right surface, the upper surface, and the lower surface, respectively, are formed at a pitch 'a', and a plurality of wrinkles toward the front and rear surfaces, respectively, are formed at a pitch 'b'. can be formed

Specifically, the pitch 'b' is an integer value closest to a value obtained by multiplying the pitch 'a' by √2/2, and may have a value smaller than the pitch 'a'.

Specifically, in each of the plurality of corner surfaces, a plurality of wrinkles facing each of the front and rear surfaces have a pitch 'b', and among the plurality of wrinkles facing each of the front and rear surfaces, the outermost wrinkle and the inclined corner are bent. The interval 'Y1' may be between the points.

Specifically, in each of the left surface, the right surface, the upper surface, and the lower surface, a plurality of wrinkles facing each of the front and rear surfaces have a pitch 'a', and among the plurality of wrinkles facing each of the front and rear surfaces, the outermost An interval 'X1' may be formed between the crease and the inclined corner bending point.

Specifically, the angle 'ß' of the corner surface may be an integer value from 120 degrees to 150 degrees.

A liquefied gas storage tank according to the present invention and a ship equipped with the same are the first interval between the outermost wrinkles and the inclined corner bending points of the left, right, upper and lower surfaces constituting the wall, and each of the four corner surfaces constituting the wall. It is possible to reduce man-hours in designing and manufacturing the corner panel by making the single leg portion symmetrical by making the second interval between the outermost crease and the inclined corner bending point the same.

In addition, the liquefied gas storage tank according to the present invention and the ship including the same are all wrinkles on the left surface, right surface, upper and lower surfaces constituting the wall, all wrinkles of a plurality of corner surfaces constituting the wall, and the front and rear surfaces constituting the wall By forming most of the wrinkles at the same regular pitch, and forming an irregular pitch different from the regular pitch only on the rest of the front and back surfaces, the arrangement area of the irregular pitch can be minimized, resulting in a number of wrinkles. Cost and man-hours for manufacturing and installation can be reduced.

1 is a perspective view of a liquefied gas storage tank according to the present invention.
2 is a partial cross-sectional view of a liquefied gas storage tank according to the present invention.
3 is an exploded view of a liquefied gas storage tank according to a first embodiment of the present invention.
4 is a diagram for explaining a liquefied gas storage tank according to a first embodiment of the present invention.
5 to 9 are diagrams for explaining the manufacturing process of the liquefied gas storage tank according to the first embodiment of the present invention.
10 is a cross-sectional view of a corner portion of a liquefied gas storage tank according to a first embodiment of the present invention.
11 is an exploded view of a liquefied gas storage tank according to a second embodiment of the present invention.
12 is a diagram for explaining a liquefied gas storage tank according to a second embodiment of the present invention.
FIG. 13 is a diagram for explaining the second region of FIG. 11 .
14 is an exploded view of a liquefied gas storage tank according to a third embodiment of the present invention.
15 is a diagram for explaining a liquefied gas storage tank according to a third embodiment of the present invention.
FIG. 16 is a diagram for explaining the second area of FIG. 14 .
17 is a development view of another embodiment of a liquefied gas storage tank according to a third embodiment of the present invention.
18 is an exploded view of a liquefied gas storage tank according to a fourth embodiment of the present invention.
19 is a diagram for explaining a liquefied gas storage tank according to a fourth embodiment of the present invention.
FIG. 20 is a diagram for explaining the second region of FIG. 18 .

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

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

For reference, the present invention includes a ship equipped with a liquefied gas storage tank described below. At this time, the ship can be a ship that uses at least liquefied gas as a propulsion fuel/power generation fuel, and is a concept that includes all gas carriers, merchant ships that carry non-gas cargo or people, FSRU, FPSO, Bunkering vessel, and offshore plants. .

In addition, it is noted that the inward and outward direction is an expression defined by considering that the direction toward the center of the storage space is the inward direction.

1 is a perspective view of a liquefied gas storage tank according to the present invention, and FIG. 2 is a partial cross-sectional view of the liquefied gas storage tank according to the present invention.

1 and 2, the liquefied gas storage tank 1 according to the present invention is mounted on the hull (H). At this time, the liquefied gas storage tank (1) may be a membrane type in which the bulkhead structure of the hull (H) forms the outer surface of the tank, or may be an independent type in which the liquefied gas storage tank (1) is drawn in and installed in the inner space of the hull (H) .

The type of the liquefied gas storage tank 1 is not particularly limited, and the location where the liquefied gas storage tank 1 is mounted on the hull H (inside a ship or outboard such as an upper deck) is also not limited. However, the liquefied gas storage tank 1 of the present invention may have a structure in which a heat insulating layer is disposed in an inward direction.

For reference, in this specification, the liquefied gas storage tank (1) will be described assuming that it is a membrane type in which a heat insulating layer is directly installed on the bulkhead of the hull (H). However, since the liquefied gas storage tank 1 may be provided as an independent type, it is noted that the expression hull H below can be interpreted as replacing the external body of the liquefied gas storage tank 1.

The liquefied gas storage tank 1 has a storage space. Liquefied gas may be stored in the storage space, and the liquefied gas may be LNG. Hereinafter, it will be assumed that the liquefied gas is LNG, but in the present invention, the liquefied gas is forced to be liquefied for storage because its boiling point is lower than room temperature, in addition to LNG, and covers all substances (LPG, ethane, hydrogen, ammonia, etc.) with calorific value. can do.

The storage space of the liquefied gas storage tank 1 may form a closed space surrounded by the wall 10. However, a dome 20 or the like is installed on the upper surface of the wall 10 for the inflow and outflow of liquefied gas. That is, the liquefied gas storage tank 1 may include a wall 10 and a dome 20.

The wall 10 forms a storage space for accommodating liquefied gas and also forms an adiabatic space. Specifically, the wall 10 has a primary barrier 11, a primary insulation wall 12, a secondary barrier 13, and a secondary insulation wall 14 from the inside to the outside. For reference, in this specification, the inside means a direction toward the inside of the space where the liquefied gas is stored, and the outside means the opposite direction.

As shown in FIG. 1, the wall 10 has a front surface 101, a rear surface 102, a left surface 103, a right surface 104, an upper surface 105, a lower surface 106, and a plurality of corner surfaces 107. ) is composed of

The primary barrier 11 forms a storage space for accommodating liquefied gas. The primary barrier 11 may be made of a metal material to suppress brittle fracture due to low-temperature liquefied gas, and is composed of, for example, SUS, INVAR, or the like.

In addition, a wrinkled or concave-convex structure may be formed on the primary barrier 11 to prepare for sloshing. As these primary barriers 11 are overlapped with each other and sealed by welding, the entire storage space (except for the dome 20) is made into a closed space.

The primary barrier 11 has a function as a barrier to prevent leakage of liquefied gas. In addition, since the secondary barrier 13 to be described later also serves as a barrier to prevent leakage of liquefied gas, the liquefied gas storage tank 1 of the present invention has a structure that implements leakage prevention in at least two layers.

The primary insulation wall 12 is disposed outside the primary barrier 11 and implements a primary insulation function. The primary insulating wall 12 may have a laminated form of plywood and insulating blocks. The plywood is provided on the inside of the primary insulating wall 12, and an anchoring unit (not shown) is fixed to the plywood. The anchoring unit is a configuration provided for overlap welding of the primary barrier 11 and may be made of the same/similar metal material as the primary barrier 11.

The heat insulating block is provided outside the primary heat insulating wall 12 and has heat insulating properties. The insulating block may be made of a polyurethane foam block or a box block containing an insulating material. This insulation block may be bonded and fixed to the secondary barrier 13 to be described later through bonding or the like, or may be fixed to the hull H or the like by bolting.

The primary thermal insulation wall 12 is disposed in the closed space between the primary barrier 11 and the secondary barrier 13, the space in which the primary thermal insulation wall 12 is disposed can form a thermal insulation space, the primary The heat insulating space in which the heat insulating wall 12 is disposed may be referred to as a primary heat insulating space.

A connection insulating wall 121 is filled between a pair of adjacent primary insulating walls 12 to prevent breakage of the insulating structure. The connection insulating wall 121 may have a structure including a plywood (not shown) and a heat insulating block (not shown) identically / similarly to the primary insulating wall 12 .

The inner surface of the primary insulation wall 12 and the connection insulation wall 121 may be provided side by side with each other, and the primary barrier 11 on the inner surface of the connection insulation wall 121 and the inner surface of the primary insulation wall 12 ) can be installed.

The secondary barrier 13 is provided outside the primary thermal insulation wall 12 . The secondary barrier 13 has a sealing function to prevent leakage of liquefied gas together with the primary barrier 11, and the secondary barrier 13 prevents leakage of liquefied gas when the primary barrier 11 is damaged. will prevent

The secondary barrier 13 may be, for example, a composite sheet in which a metal sheet and a glass fiber sheet are variously combined, or may be made of a metal material such as SUS or INVAR.

The secondary barrier 13 may be laminated on the secondary insulation wall 14 . A connection barrier (not shown) may be laminated to seal the gap between the secondary insulation walls 14, and the secondary barrier 13 on the secondary insulation wall 14 is made of a relatively rigid material, , The connection barrier between the secondary insulation walls 14 may be provided with a relatively flexible material in preparation for contraction and expansion.

The secondary insulation wall 14 is disposed outside the secondary barrier 13 . The secondary insulation wall 14 has a thermal insulation function similarly to the primary insulation wall 12, and has a structure in which plywood and insulation blocks are laminated in the same / similar manner to the primary insulation wall 12.

However, the stacking order of the plywood and the insulating block of the secondary insulating wall 14 may be opposite to that of the primary insulating wall 12. While the primary insulation wall 12 is provided with a plywood anchoring unit provided on the inner surface for welding fixation of the primary barrier 11, the secondary insulation wall 14 is fixed to the hull (H) side. A plywood may be provided on the outer surface.

The secondary insulation wall 14 may be fixed using bolts to the inner surface of the hull (H), and may also be fixed using mastic. Mastic fixes the plywood of the secondary insulation wall 14 to the hull (H) as an adhesive.

The secondary insulation wall 14 is disposed in a closed space between the secondary barrier 13 and the hull H, and the space in which the secondary insulation wall 14 is disposed may be referred to as a secondary insulation space.

That is, the wall 10 goes from the inside to the outside, forming a primary barrier 11 - a primary insulation space (primary insulation wall 12) - a secondary barrier 13 - a secondary insulation space (second insulation wall 14 )) - It is provided to be stacked in order of the hull (H), and the primary insulation space and the secondary insulation space are closed by a dome 20 to be described later.

In this way, the storage space of the liquefied gas storage tank 1 may be formed by the wall 10 having the double barrier and the double insulation wall (insulation space). The wall 10 includes a flat or curved surface or an inclined surface to form a storage space of various shapes.

The dome 20 is provided on the wall 10 forming the upper surface of the storage space. The wall 10 forming the storage space has an open top surface for the inflow and outflow of liquefied gas or boil-off gas, and the dome 20 is installed and finished at the open portion.

In particular, the liquefied gas storage tank 1 of the present invention may be applied to a ship, and the ship may include an inner deck forming the upper surface of the storage space and a trunk deck provided outside the inner deck. It may be provided in a form penetrating both the deck and the trunk deck.

The dome 20 closes the insulation space formed in the wall 10. As described above, the insulation space is provided independently on the inside and outside of the secondary barrier 13 in the wall 10, and the dome 20 finishes the primary insulation space and the secondary insulation space so as to be separated from each other. can

The dome 20 may be provided in plurality to independently take charge of the inflow and outflow of liquefied gas and evaporation gas, and the dome 20 for the inflow and outflow of liquefied gas is referred to as a tank dome 20a, and evaporates. The dome 20 for inflow and outflow of gas may be referred to as a vapor dome 20b.

At this time, the pump tower 30 may be provided by extending downward from the vapor dome 20b for the inflow and outflow of liquefied gas, and the tank dome 20a is disposed at a position spaced apart from the vapor dome 20b, and the pump tower 30 ), it can receive boil-off gas and discharge it to the outside.

3 is an exploded view of a liquefied gas storage tank according to the first embodiment of the present invention, FIG. 4 is a diagram for explaining the liquefied gas storage tank according to the first embodiment of the present invention, and FIGS. It is a diagram for explaining the manufacturing process of the liquefied gas storage tank according to the first embodiment of the present invention, and FIG. 10 is a cross-sectional view of a corner portion of the liquefied gas storage tank according to the first embodiment of the present invention.

As shown in FIGS. 1, 2, 3, and 4, the liquefied gas storage tank 1 according to the first embodiment of the present invention has a front surface 101, a rear surface 102, a seating surface 103, It may be made of a wall 10 composed of a right surface 104, an upper surface 105, a lower surface 106 and a plurality of corner surfaces 107, and has an octagonal vertical section and a square horizontal section shape.

Each of the front surface 101, the rear surface 102, the seat surface 103, the right surface 104, the upper surface 105, the lower surface 106 and the plurality of corner surfaces 107 has at least one heat insulating wall and a heat insulating material. The primary barrier 11, which is provided to face the liquefied gas on the inside of the wall and has a plurality of grid-shaped wrinkles 111 formed at a constant pitch, and any one surface of the front 101 and the rear surface 102 The left surface 103, the right surface 104, the upper surface 105, the lower surface 106, and the right angle corner bending point 50 to which each of the plurality of corner surfaces 107 is connected, the upper surface 105, the lower surface 106, It may include an inclined corner bending point 40 where any one of the left surface 103 and the right surface 104 is connected to each of the plurality of corner surfaces 107 . In the above, at least one insulating wall may be a primary insulating wall 12 and a secondary insulating wall 14 .

Hereinafter, the left surface 103, right surface 104, upper surface 105 and When the lower surface 106, the distance between each outermost wrinkle 111 and the inclined corner bending point 40, and the outermost wrinkle 111 and the inclined corner bending of each of the plurality of corner surfaces 107 constituting the wall 10 A process of forming the same distance between the points 40 will be described with reference to FIGS. 4 to 10 .

As shown in FIG. 5, each angle 'ß' of the plurality of corner surfaces 107 is determined at the inclined corner bending point 40 by setting each angle of the front surface 101 and the rear surface 102. The angle 'ß' of the corner surface 107 may be an integer value between 120 degrees and 150 degrees, and may be preferably 135 degrees.

As shown in FIGS. 6 and 7 , among the plurality of wrinkles 111 on the front surface 101 and the rear surface 102, a plurality of wrinkles 111 are directed toward the left surface 103, the right surface 104, and the plurality of corner surfaces 107, respectively. Arrange the horizontal wrinkles 1111 at the pitch 'a', but the ends of each of the plurality of horizontal wrinkles 1111 toward the plurality of corner surfaces 107 are near the right angle corner bending point 50. It is determined to be bent at right angles to the right angle corner bending point 50 so as to be connected to a plurality of wrinkles 111 formed horizontally in ) and extended to the right angle corner bending point 50.

As shown in FIG. 8, among the plurality of wrinkles 111 of each of the plurality of corner surfaces 107, a plurality of wrinkles 111 directed toward the front 101 and the rear surface 102 are selected from the front 101 and the rear surface 102. After arranging the extended horizontal corrugations 1111 at pitch 'bb' so as to be connected to each end, the pitch 'bb' of the wrinkles 111 formed on the plurality of corner surfaces 107 is divided by 1/2. By further disposing the wrinkles 111 on the plurality of corner surfaces 107, the plurality of wrinkles 111 are determined to have a pitch 'b'.

As shown in FIG. 9, among the plurality of wrinkles 111 of the front surface 101 and the rear surface 102, a plurality of vertical wrinkles directed toward the upper surface 105, the lower surface 106, and the plurality of corner surfaces 107, respectively. (1112) is arranged at pitch 'a', but the point at which it is finished is determined to coincide with the extension line of the center of dividing the pitch 'bb' of the wrinkles 111 formed on the plurality of corner surfaces 107 by 1/2 .

Thereafter, the outermost wrinkles 111 and the inclined corner bending point ( 40) is determined by the following formula.

X = {1 + 1/(n + 1)} * 360 * tan{90 - (ß/2)} - - - [Formula]

(In the formula, 'n' is the number of pleat pitches on the left surface, right surface, upper surface, or lower surface)

After determining the distance 'X', the distance 'between the outermost wrinkles 111 of each of the plurality of corner surfaces 107 formed in parallel from the inclined corner bending point 40 and the inclined corner bending point 40' Determine Y' equal to the interval 'X'.

In the above, when the interval 'X' is a prime number or an irrational number, it may be determined as an interval 'X1' by adjusting it to an integer.

When the distance 'X' and the angle 'ß' of the corner surface 107 is 135 degrees, 223.68 mm is obtained by the above formula, and the distance 'X1' can be determined to be 224 mm by adjusting this to an integer value.

The interval 'Y' may calculate the interval 'Y1' by utilizing a preset equation to newly define a relationship with the interval 'X1' adjusted to an integer value.

The interval 'Y1' may be determined by a difference between the interval 'X1' and a predetermined error value, rather than being calculated and determined according to a preset formula. At this time, the preset error may be within 1 mm.

For example, if the distance 'X' is 223.68mm, the distance 'Y' is also determined to be 223.68mm, and as the distance 'X1' is adjusted to 224mm, the distance 'Y1' is a preset formula or a preset error. 223.4 mm can be determined taking into account.

As shown in FIGS. 3 and 4, the liquefied gas storage tank 1 according to the first embodiment has a left surface 103, a right surface 104, an upper surface 105 and a lower surface 106, respectively, in the horizontal and A plurality of wrinkles 111 formed vertically may be formed at a pitch 'a'.

In addition, on each of the front surface 101 and the rear surface 102, a plurality of wrinkles 111 formed horizontally and vertically may be formed with a pitch 'a'.

In addition, on each of the plurality of corner surfaces 107, a plurality of wrinkles 111 facing each of the left surface 103, the right surface 104, the upper surface 105 and the lower surface 106 may be formed with a pitch 'a', , A plurality of pleats 111 facing each of the front surface 101 and the rear surface 102 may be formed with a pitch 'b'.

In the above, the pitch 'a' of the pleats 111 on the front surface 101, the back surface 102, the left surface 103, the right surface 104, the upper surface 105 and the lower surface 106 may be a regular pitch, For example, it may be 360 mm.

The pitch 'b' of the wrinkles 111 on the plurality of corner surfaces 107 may be an irregular pitch, and as described above, after arranging the wrinkles 111 on the plurality of corner surfaces 107 at the pitch 'bb' , which is obtained by further arranging the pleats 111 in the portion obtained by dividing the pitch 'bb' by 1/2.

The pitch 'bb' may be an integer value closest to the value obtained by multiplying the pitch 'a' by √2, and the pitch 'b' may be an integer value closest to the value obtained by multiplying the pitch 'a' by √2/2. The pitch 'b' may be 254.56 mm when the pitch 'a' is 360 mm.

As described above, the liquefied gas storage tank 1 of the first embodiment, as shown in FIG. , Among the plurality of wrinkles 111 facing the front surface 101 and the rear surface 102, a plurality of corner surfaces 107 having a distance 'Y1' between the outermost wrinkles 111 and the inclined corner bending point 40 can have

In addition, as shown in FIG. 10, in the liquefied gas storage tank 1 of the first embodiment, a plurality of pleats 111 facing each of the front 101 and the rear 102 have a pitch 'a', and the front ( 101) and the rear surface 102, among the plurality of wrinkles 111 facing each, the left surface 103, the right surface 104, and the upper surface with the distance 'X1' between the outermost wrinkle 111 and the inclined corner bending point 40 (105) and lower surface (106).

The first embodiment described above has described the case of tanks 2 to 4 among a plurality of liquefied gas storage tanks 1 provided in a ship, but also about No. 1 provided on the bow side having a different angle from tanks 2 to 4 Applicable, of course.

Hereinafter, all the wrinkles 111 of the left surface 103, the right surface 104, the upper surface 105 and the lower surface 106 constituting the wall 10 and a plurality of corner surfaces 107 constituting the wall 10 will be described. All the pleats 111 and most of the pleats 111 on the front 101 and the back 102 constituting the wall 10 are formed at the same regular pitch, and only the rest of the front 101 and the back 102 are regular. By configuring to form an irregular pitch different from the pitch, the liquefied gas storage tank 1 capable of minimizing the arrangement area of the irregular pitch will be described with reference to FIGS. 11 to 17.

11 is an exploded view of a liquefied gas storage tank according to a second embodiment of the present invention, FIG. 12 is a diagram for explaining a liquefied gas storage tank according to a second embodiment of the present invention, and FIG. It is a drawing for explaining area 2.

As shown in FIGS. 1, 2 and 11, the liquefied gas storage tank 1 according to the second embodiment of the present invention has a front surface 101, a rear surface 102, a left surface 103, and a right surface 104. ), may be made of a wall 10 composed of an upper surface 105, a lower surface 106 and a plurality of corner surfaces 107, and has an octagonal vertical section and a square horizontal section shape.

Each of the front surface 101, the rear surface 102, the seat surface 103, the right surface 104, the upper surface 105, the lower surface 106 and the plurality of corner surfaces 107 has at least one heat insulating wall and a heat insulating material. The primary barrier 11, which is provided to face the liquefied gas on the inside of the wall and has a plurality of grid-shaped wrinkles 111 formed at a constant pitch, and any one surface of the front 101 and the rear surface 102 The left surface 103, the right surface 104, the upper surface 105, the lower surface 106, and the right angle corner bending point 50 to which each of the plurality of corner surfaces 107 is connected, the upper surface 105, the lower surface 106, It may include an inclined corner bending point 40 where any one of the left surface 103 and the right surface 104 is connected to each of the plurality of corner surfaces 107 . In the above, at least one insulating wall may be a primary insulating wall 12 and a secondary insulating wall 14 .

As shown in FIGS. 11 and 12, each of the left surface 103, the right surface 104, the upper surface 105 and the lower surface 106 may have a plurality of wrinkles 111 formed at a pitch 'a', Each of the plurality of corner surfaces 107 may have a plurality of wrinkles 111 formed at a pitch 'a'.

Each of the front surface 101 and the rear surface 102 may have one of the plurality of horizontal wrinkles 1111 or the plurality of vertical wrinkles 1112 formed at a regular pitch and the other at an irregular pitch. be explained by

Each of the front surface 101 and the rear surface 102 may be divided into a first area R1, a second area R2, and a third area R3.

The first region R1 may be a region connected to each of the left surface 103 , the right surface 104 , the upper surface 105 , and the lower surface 106 .

In the first region R1, one of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 may be formed with a pitch 'a', and the other may be formed with a pitch 'b'.

The second region R2 may be a region connected to each of the plurality of corner surfaces 107 .

In the second region R2, a plurality of horizontal wrinkles 1111 and a plurality of vertical wrinkles 1112 may be formed with a pitch 'b'.

The third region R3 may be a region surrounded by the first region R1 and the second region R2 and disposed in the center.

In the third region R3, a plurality of horizontal wrinkles 1111 and a plurality of vertical wrinkles 1112 may be formed with a pitch 'a'.

In the liquefied gas storage tank 1 according to the second embodiment, each of the plurality of corner surfaces 107 is connected to the upper surface 105, the lower surface 106, the left surface 103, and the right surface 104 at an angle of 135 degrees. , and the pitch 'a' may be a storage tank having a regular pitch.

In such a liquefied gas storage tank 1, the pitch 'b' as an irregular pitch is an integer value closest to the value obtained by multiplying the pitch 'a' by √2/2, and may have a value smaller than the pitch 'a'.

For example, each of the plurality of corner surfaces 107 is connected to each of the upper surface 105, the lower surface 106, the left surface 103, and the right surface 104 at an angle of 135 degrees, and the pitch 'a' is 360 mm, The pitch 'b' is 254.56 mm, which is a value obtained by multiplying 360 mm by √2/2, and may be determined as 255 mm, which is an integer value closest to 254.56 mm.

In the above, as shown in FIGS. 11, 12 and 13 , the second region R2 has a bottom edge in contact with the first region R1 connected to the left surface 103 and the right surface 104, respectively. And, the part in contact with the first region R1 connected to each of the upper surface 105 and the lower surface 106 becomes the height, and the part in contact with each of the plurality of corner surfaces 107 becomes the hypotenuse. It forms a right isosceles triangle. In the second region R2, the ratio of the bases may be an irrational value of '√2/2', the ratio of the heights may be an irrational value of '√2/2', and the ratio of the hypotenuses may be an integer value of '1'.

In the second region R2 of the second embodiment, when each of the plurality of corner surfaces 107 has the same width, all of them can form an isosceles right triangle, but the widths of each of the plurality of corner surfaces 107 are not the same and different In this case, at least one of them may form an isosceles right triangle. For example, if the width of the corner surface 107 connected to the upper surface 105 is wider than the width of the corner surface 107 connected to the lower surface 106, connected to the corner surface 107 connected to the upper surface 105 The second region R2 to be formed may form an isosceles right triangle, and the second region R2 connected to the corner surface 107 connected to the lower surface 105 may form a deformed isosceles right triangle. In this case, pitches of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 formed in the second region R2 may be determined based on the corner surface 107 forming an isosceles right triangle.

As shown in FIG. 12, the liquefied gas storage tank 1 of the second embodiment has a plurality of wrinkles 111 facing each of the front surface 101 and the rear surface 102 at each of the plurality of corner surfaces 107 pitch In the state of being maintained at 'a', the ends of each of the plurality of horizontal corrugations 1111 formed at the pitch 'b' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are bent at right angle corners. It is bent at right angles to the right angle corner bending point 50 so as to be connected to the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 near the point 50 and can be extended to the right angle corner bending point 50. .

In addition, as shown in FIG. 12, the liquefied gas storage tank 1 of the second embodiment has a plurality of wrinkles 111 facing each of the front 101 and the rear surface 102 at each of the plurality of corner surfaces 107 In the state where the pitch 'a' is maintained, the ends of each of the plurality of vertical corrugations 1112 formed at the pitch 'b' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are at right angles. It is finished near the corner bending point 50, but the finishing point may be closed so that it is not connected to the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 near the right angle corner bending point 50.

14 is an exploded view of a liquefied gas storage tank according to a third embodiment of the present invention, FIG. 15 is a diagram for explaining a liquefied gas storage tank according to a third embodiment of the present invention, and FIG. It is a drawing for explaining region 2, and FIG. 17 is a development view of another embodiment of a liquefied gas storage tank according to a third embodiment of the present invention.

As shown in FIGS. 1, 2 and 14, the liquefied gas storage tank 1 according to the third embodiment of the present invention has a front surface 101, a rear surface 102, a left surface 103, and a right surface 104. ), may be made of a wall 10 composed of an upper surface 105, a lower surface 106 and a plurality of corner surfaces 107, and has an octagonal vertical section and a square horizontal section shape.

Each of the front surface 101, the rear surface 102, the seat surface 103, the right surface 104, the upper surface 105, the lower surface 106 and the plurality of corner surfaces 107 has at least one heat insulating wall and a heat insulating material. The primary barrier 11, which is provided to face the liquefied gas on the inside of the wall and has a plurality of grid-shaped wrinkles 111 formed at a constant pitch, and any one surface of the front 101 and the rear surface 102 The left surface 103, the right surface 104, the upper surface 105, the lower surface 106, and the right angle corner bending point 50 to which each of the plurality of corner surfaces 107 is connected, the upper surface 105, the lower surface 106, It may include an inclined corner bending point 40 where any one of the left surface 103 and the right surface 104 is connected to each of the plurality of corner surfaces 107 . In the above, at least one insulating wall may be a primary insulating wall 12 and a secondary insulating wall 14 .

As shown in FIGS. 14 and 15, each of the left surface 103, the right surface 104, the upper surface 105 and the lower surface 106 may have a plurality of wrinkles 111 formed at a pitch 'a', Each of the plurality of corner surfaces 107 may have a plurality of wrinkles 111 formed at a pitch 'a'.

Each of the front surface 101 and the rear surface 102 may have one of the plurality of horizontal wrinkles 1111 or the plurality of vertical wrinkles 1112 formed at a regular pitch and the other at an irregular pitch. be explained by

Each of the front surface 101 and the rear surface 102 may be divided into a first area R1, a second area R2, and a third area R3.

The first region R1 may be a region in which each of the front surface 101 and the rear surface 102 is connected to the left surface 103 and the right surface 104 , respectively.

In the first region R1, one of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 may be formed with a pitch 'a', and the other may be formed with a pitch 'b'.

The second region R2 may be a region connected to each of the plurality of corner surfaces 107 .

In the second region R2 , one of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 may be formed with a pitch 'a' and the other may be formed with a pitch 'b'.

The third region R3 may be a region in which the upper side is connected to the upper surface 105, the lower side is connected to the lower surface 106, and both sides are connected to the first and second regions R1 and R2. .

In the third region R3, a plurality of horizontal wrinkles 1111 and a plurality of vertical wrinkles 1112 may be formed with a pitch 'a'.

In the liquefied gas storage tank 1 according to the third embodiment, each of the plurality of corner surfaces 107 is at an angle of 120 to 150 degrees with each of the upper surface 105, the lower surface 106, the left surface 103, and the right surface 104. It may be a storage tank in which an integer value of angle is connected and the pitch 'a' is a regular pitch. The corner inclination angle formed by each of the plurality of corner surfaces 107 with each of the upper surface 105 and the lower surface 106 may be a large value based on 135 degrees, and each of the plurality of corner surfaces 107 is formed on the left surface 103 and the right surface. (104) The corner inclination angle formed with each may be a small value based on 135 degrees. Preferably, each of the plurality of corner surfaces 107 forms a corner inclination angle with each of the upper surface 105 and the lower surface 106 may be 150 degrees, and each of the plurality of corner surfaces 107 is left surface 103 and right surface 104 ), the corner inclination angle formed with each may be 120 degrees.

In such a liquefied gas storage tank 1, the pitch 'b' as an irregular pitch is an integer value closest to the value obtained by multiplying the pitch 'a' by √3/2, and may have a value smaller than the pitch 'a'.

For example, each of the plurality of corner surfaces 107 is connected to each of the upper surface 105 and the lower surface 106 at 150 degrees, and each of the plurality of corner surfaces 107 is connected to each of the left surface 103 and the right surface 104 at 120 degrees. Connected by degrees, when the pitch 'a' is 360 mm, the pitch 'b' is 311.77 mm, which is a value obtained by multiplying 360 mm by √3/2, and may be determined as 312 mm, which is an integer value closest to 311.77 mm.

In the above, as shown in FIGS. 14, 15, and 16 , the second region R2 has a bottom edge at a portion in contact with the first region R1 connected to the left surface 103 and the right surface 104, respectively. A portion connected to the side of the third region R3 becomes a height, and a portion in contact with each of the plurality of corner surfaces 107 forms a right triangle with hypotenuses. In the second region R2 , the base ratio may be an irrational value of '√3', the height ratio may be an integer value '1', and the hypotenuse ratio may be an integer value '2'.

The second region R2 of the third embodiment can form a right triangle when each of the plurality of corner surfaces 107 has the same width, but when the respective widths of the plurality of corner surfaces 107 are not the same and are different. , at least one of which may form a right triangle. For example, if the width of the corner surface 107 connected to the upper surface 105 is wider than the width of the corner surface 107 connected to the lower surface 106, connected to the corner surface 107 connected to the upper surface 105 The second region R2 formed may form a right triangle, and the second region R2 connected to the corner surface 107 connected to the lower surface 105 may form a deformed right triangle. In this case, pitches of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 formed in the second region R2 may be determined based on the corner surface 107 forming a right triangle.

As shown in FIG. 15, the liquefied gas storage tank 1 of the third embodiment has a plurality of wrinkles 111 facing each of the front surface 101 and the rear surface 102 at each of the plurality of corner surfaces 107 pitch In the state of being maintained at 'a', the ends of each of the plurality of horizontal corrugations 1111 formed with the pitch 'a' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are bent at right angle corners. Near the point 50, it is bent at right angles to the right angle corner bending point 50 so as to be alternately connected to the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 and extends to the right angle corner bending point 50. It can be.

In addition, as shown in FIG. 15, the liquefied gas storage tank 1 of the third embodiment has a plurality of wrinkles 111 facing each of the front 101 and the rear surface 102 at each of the plurality of corner surfaces 107 In the state where the pitch 'a' is maintained, the ends of each of the plurality of vertical corrugations 1112 formed at the pitch 'b' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are at right angles. It is finished near the corner bending point 50, but the finishing point may be closed so that it is not connected to the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 near the right angle corner bending point 50.

In addition, as shown in FIG. 17, the liquefied gas storage tank 1 of the third embodiment has a plurality of wrinkles 111 facing each of the front 101 and the rear surface 102 at each of the plurality of corner surfaces 107 In the state where the pitch 'a' is maintained, the ends of each of the plurality of horizontal corrugations 1111 formed at the pitch 'a' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are at right angles. It is finished near the corner bending point 50, but the finishing point may be closed so that it is not connected to the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 near the right angle corner bending point 50.

In addition, as shown in FIG. 17, the liquefied gas storage tank 1 of the third embodiment has a plurality of wrinkles 111 facing each of the front 101 and the rear surface 102 at each of the plurality of corner surfaces 107 In the state where the pitch 'a' is maintained, the ends of each of the plurality of vertical corrugations 1112 formed at the pitch 'b' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are at right angles. It is bent at right angles to the right angle corner bending point 50 so as to be connected to the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 near the corner bending point 50 and extends to the right angle corner bending point 50. can

18 is an exploded view of a liquefied gas storage tank according to a fourth embodiment of the present invention, FIG. 19 is a diagram for explaining a liquefied gas storage tank according to a fourth embodiment of the present invention, and FIG. It is a drawing for explaining area 2.

As shown in FIGS. 1, 2 and 18, the liquefied gas storage tank 1 according to the fourth embodiment of the present invention has a front surface 101, a rear surface 102, a left surface 103, and a right surface 104. ), may be made of a wall 10 composed of an upper surface 105, a lower surface 106 and a plurality of corner surfaces 107, and has an octagonal vertical section and a square horizontal section shape.

Each of the front surface 101, the rear surface 102, the seat surface 103, the right surface 104, the upper surface 105, the lower surface 106 and the plurality of corner surfaces 107 has at least one heat insulating wall and a heat insulating material. The primary barrier 11, which is provided to face the liquefied gas on the inside of the wall and has a plurality of grid-shaped wrinkles 111 formed at a constant pitch, and any one surface of the front 101 and the rear surface 102 The left surface 103, the right surface 104, the upper surface 105, the lower surface 106, and the right angle corner bending point 50 to which each of the plurality of corner surfaces 107 is connected, the upper surface 105, the lower surface 106, It may include an inclined corner bending point 40 where any one of the left surface 103 and the right surface 104 is connected to each of the plurality of corner surfaces 107 . In the above, at least one heat insulating wall may be a primary heat insulating wall 12 and a second heat insulating wall 14 .

As shown in FIGS. 18 and 19, each of the left surface 103, the right surface 104, the upper surface 105, and the lower surface 106 may have a plurality of wrinkles 111 formed at a pitch 'a', Each of the plurality of corner surfaces 107 may have a plurality of wrinkles 111 formed at a pitch 'a'.

Each of the front surface 101 and the rear surface 102 may have one of the plurality of horizontal wrinkles 1111 or the plurality of vertical wrinkles 1112 formed at a regular pitch and the other at an irregular pitch. explained by

Each of the front surface 101 and the rear surface 102 may be divided into a first area R1, a second area R2, and a third area R3.

The first region R1 may be a region in which each of the front surface 101 and the rear surface 102 is connected to the upper surface 105 and the lower surface 106 , respectively.

In the first region R1, one of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 may be formed with a pitch 'a', and the other may be formed with a pitch 'b'.

The second region R2 may be a region connected to each of the plurality of corner surfaces 107 .

In the second region R2 , one of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 may be formed with a pitch 'a' and the other may be formed with a pitch 'b'.

The third region R3 may be a region in which one side is connected to the left surface 103, the other side is connected to the right surface 104, and the upper and lower sides are connected to the first and second regions R1 and R2. there is.

In the third region R3, a plurality of horizontal wrinkles 1111 and a plurality of vertical wrinkles 1112 may be formed with a pitch 'a'.

In the liquefied gas storage tank 1 according to the fourth embodiment, each of the plurality of corner surfaces 107 is at an angle of 120 to 150 degrees with each of the upper surface 105, the lower surface 106, the left surface 103, and the right surface 104. It may be a storage tank in which an integer value of angle is connected and the pitch 'a' is a regular pitch. Each of the plurality of corner surfaces 107 has a corner inclination angle formed with each of the upper surface 105 and the lower surface 106 may be a small value based on 135 degrees, and each of the plurality of corner surfaces 107 has a left surface 103 and a right surface. (104) The corner inclination angle formed with each may be a large value based on 135 degrees. Preferably, each of the plurality of corner surfaces 107 forms a corner inclination angle with each of the upper surface 105 and the lower surface 106 may be 120 degrees, and each of the plurality of corner surfaces 107 is left surface 103 and right surface 104 ), the corner inclination angle formed with each may be 150 degrees.

In such a liquefied gas storage tank 1, the pitch 'b' as an irregular pitch is an integer value closest to the value obtained by multiplying the pitch 'a' by √3/2, and may have a value smaller than the pitch 'a'.

For example, each of the plurality of corner surfaces 107 is connected to each of the upper surface 105 and the lower surface 106 at 120 degrees, and each of the plurality of corner surfaces 107 is connected to each of the left surface 103 and the right surface 104 at 150 degrees. Connected by degrees, when the pitch 'a' is 360 mm, the pitch 'b' is 311.77 mm, which is a value obtained by multiplying 360 mm by √3/2, and may be determined as 312 mm, which is an integer value closest to 311.77 mm.

In the above, as shown in FIGS. 18, 19 and 20 , the base of the second region R2 is in contact with the third region R3 connected to the left surface 103 and the right surface 104 respectively. A portion connected to the side of the first region R1 becomes a height, and a portion in contact with each of the plurality of corner surfaces 107 forms a right triangle with hypotenuses. In the second region R2, the height ratio may be an irrational value of '√3', the base ratio may be an integer value '1', and the hypotenuse ratio may be an integer value '2'.

The second region R2 of the fourth embodiment can form a right triangle when the respective widths of the plurality of corner surfaces 107 are the same, but when the widths of the plurality of corner surfaces 107 are not the same and are different. , at least one of which may form a right triangle. For example, when the width of the corner surface 107 connected to the upper surface 105 is wider than the width of the corner surface 107 connected to the lower surface 106, the corner surface 107 connected to the upper surface 105 The connected second region R2 may form a right triangle, and the second region R2 connected to the corner surface 107 connected to the lower surface 105 may form a deformed right triangle. In this case, pitches of the plurality of horizontal wrinkles 1111 and the plurality of vertical wrinkles 1112 formed in the second region R2 may be determined based on the corner surface 107 forming a right triangle.

As shown in FIG. 19, the liquefied gas storage tank 1 of the fourth embodiment has a plurality of wrinkles 111 facing each of the front surface 101 and the rear surface 102 at each of the plurality of corner surfaces 107 pitch In the state of being maintained at 'a', the ends of each of the plurality of horizontal corrugations 1111 formed at the pitch 'b' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are bent at right angle corners. It is bent at right angles to the right angle corner bending point 50 so as to be continuously connected to each of the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 near the point 50 and extends to the right angle corner bending point 50 It can be.

In addition, as shown in FIG. 19, the liquefied gas storage tank 1 of the fourth embodiment has a plurality of wrinkles 111 facing each of the front 101 and the rear surface 102 at each of the plurality of corner surfaces 107 In the state where the pitch 'a' is maintained, the ends of each of the plurality of vertical corrugations 1112 formed at the pitch 'a' toward each of the plurality of corner surfaces 107 from the front surface 101 and the rear surface 102 are at right angles. It is finished near the corner bending point 50, but the finishing point may be closed so that it is not connected to the plurality of wrinkles 111 formed on the plurality of corner surfaces 107 near the right angle corner bending point 50.

The present invention is not limited to the embodiments described above, and may include a combination of the above embodiments or a combination of at least one of the above embodiments and known technology as another embodiment.

Although the present invention has been described in detail through specific examples, this is for explaining the present invention in detail, the present invention is not limited thereto, and within the technical spirit of the present invention, by those skilled in the art It will be clear that the modification or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific protection scope of the present invention will be clarified by the appended claims.

1: liquefied gas storage tank H: hull
10: wall 101: front
102: back 103: left side
104: right side 105: top side
106: lower surface 107: corner surface
11: primary barrier 111: wrinkles
1111: horizontal wrinkles 1112: vertical wrinkles
12: primary insulation wall 121: connection insulation wall
13: secondary barrier 14: secondary insulation barrier
20: dome 30: pump tower
40: inclined corner bending point 50: right angle corner bending point
R1: first area R2: second area
R3: 3rd area

Claims (9)

A liquefied gas storage tank made of a wall composed of a front, rear, left, right, top, bottom and a plurality of corner surfaces and having an octagonal vertical section and a square horizontal section shape,
Each of the front surface, the rear surface, the left surface, the right surface, the upper surface, the lower surface, and the plurality of corner surfaces,
at least one insulating wall;
A barrier provided to face the liquefied gas inside the heat insulating wall and having a plurality of grid-shaped wrinkles formed at a predetermined pitch;
a right angle corner bending point at which any one of the front and rear surfaces is connected to each of the left surface, the right surface, the upper surface, the lower surface, and the plurality of corner surfaces; and
Including an inclined corner bending point where any one of the upper surface, the lower surface, the left surface and the right surface is connected to each of the plurality of corner surfaces,
Regarding the inclined corner bending point,
An angle 'ß' of each of the plurality of corner surfaces is determined at the inclined corner bending point by setting angles of each of the front and rear surfaces,
The distance 'X' between the outermost wrinkles of the left surface, the right surface, the upper surface, and the lower surface, respectively, and the inclined corner bending point, which are formed most adjacently and side by side from the inclined corner bending point, is determined by the following equation,
X = {1 + 1/(n + 1)} * 360 * tan{90 - (ß/2)} - - - [Formula]
(In the above formula, 'n' is the number of pleat pitches of the left surface, the right surface, the upper surface, or the lower surface)
A liquefied gas storage tank in which the distance 'Y' between the outermost wrinkles of each of the plurality of corner surfaces formed side by side and closest to the inclined corner bending point is determined to be the same as the distance 'X' . According to claim 1,
Between determining the corner surface angle 'ß' and determining the distance 'X',
Among the plurality of wrinkles on the front and back surfaces, a plurality of horizontal wrinkles directed to the left surface, the right surface, and the plurality of corner surfaces, respectively, are arranged at a pitch 'a', and each of the plurality of horizontal wrinkles directed to the plurality of corner surfaces The end of is bent at right angles to the right angle corner bending point so as to be connected to a plurality of wrinkles formed on the plurality of corner surfaces near the right angle corner bending point to determine that it extends to the right angle corner bending point,
Among the plurality of wrinkles of each of the plurality of corner surfaces, a plurality of wrinkles toward the front and rear surfaces are arranged at a pitch 'bb' so as to be connected to the ends of each of the extended horizontal wrinkles on the front and rear surfaces, and then the plurality of Determining that a plurality of wrinkles on each of the plurality of corner surfaces have a pitch 'b' by further arranging wrinkles in a portion obtained by dividing the pitch 'bb' of the wrinkles formed on the corner surface by 1/2,
Among the plurality of wrinkles on the front and back surfaces, a plurality of vertical wrinkles directed to each of the upper surface, the lower surface, and the plurality of corner surfaces are arranged at a pitch 'a', and the wrinkles at which the finishing point is formed on the plurality of corner surfaces The liquefied gas storage tank further comprising determining to coincide with the extension of the center of the pitch 'bb' divided by 1/2. The method of claim 2, wherein the interval 'X' is,
In the case of a prime or irrational number, it is determined by the interval 'X1' by adjusting with an integer,
The interval 'Y' is,
A liquefied gas storage tank for calculating the interval 'Y1' by using a formula previously set to newly define a relationship with the interval 'X1'. The method of claim 2, wherein the interval 'X' is,
In the case of a prime or irrational number, it is determined by the interval 'X1' by adjusting with an integer,
The interval 'Y1' is,
Has a difference value within the interval 'X1' and a preset error,
The preset error is,
Liquefied gas storage tank within 1mm. The method of claim 3, wherein each of the left surface, the right surface, the upper surface, and the lower surface,
A number of wrinkles are formed with pitch 'a',
Each of the front and rear surfaces,
A number of wrinkles are formed with pitch 'a',
Each of the plurality of corner surfaces,
A plurality of wrinkles facing each of the left surface, the right surface, the upper surface, and the lower surface are formed with a pitch 'a', and a plurality of wrinkles facing each of the front and rear surfaces are formed with a pitch 'b'. Liquefied gas storage tank. The method of claim 5, wherein the pitch 'b',
A liquefied gas storage tank having an integer value closest to a value obtained by multiplying the pitch 'a' by √2/2 and having a value smaller than the pitch 'a'. The method of claim 3, wherein each of the plurality of corner surfaces,
A plurality of wrinkles facing each of the front and rear surfaces have a pitch 'b',
A liquefied gas storage tank having a distance 'Y1' between an outermost wrinkle among the plurality of wrinkles facing each of the front and rear surfaces and the inclined corner bending point. The method of claim 3, wherein each of the left surface, the right surface, the upper surface, and the lower surface,
A plurality of wrinkles facing each of the front and rear surfaces have a pitch 'a',
A liquefied gas storage tank having a distance 'X1' between an outermost wrinkle among the plurality of wrinkles facing each of the front and rear surfaces and the inclined corner bending point. The method of claim 2, wherein the angle 'ß' of the corner surface is,
A liquefied gas storage tank that is an integer value between 120 and 150 degrees.

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