KR20200062915A - Cargo tank including deformation measuring device and method for deformation measuring using the same - Google Patents

Abstract

The present invention is to provide a tank including a deformation measuring device to easily grasp deformation of the tank from the outside even in a state where an insulating material is attached, and a deformation measuring method using the same. According to an embodiment of the present invention, the tank comprises: a tank (100) installed on a vessel; a plurality of stud bolts (200) installed on the outer surface of the tank; an insulation panel (300) having a through hole (8) into which the stud bolt (200) is inserted; a securing device (50) which is located in the through hole, and which couples the insulation panel (300) to the stud bolt (200); measurers (202, 204) extending from at least one of the stud bolts (200) and penetrating the through hole (8); and a plug (70) filled in the through hole (8).

Description

A tank including a strain measuring device and a strain measuring method using the same {CARGO TANK INCLUDING DEFORMATION MEASURING DEVICE AND METHOD FOR DEFORMATION MEASURING USING THE SAME}

The present invention provides a tank having a strain measuring device capable of measuring the deformation of the tank and a method for measuring the deformation of the tank using the same, and more specifically, it is possible to measure the deformation of the type B independent tank based on the IMO IGC code. It is to provide a tank having a strain measuring device and a method for measuring the strain of the tank using the tank.

LNG carriers are classified into a type with a largely independent tank according to the type of cargo containment system and a type with a membrane hold in the hull.

The independent tank type is divided into type A, type B, and type C based on the IMO IGC code, and requires a design that can prepare for insulation and leakage to store cryogenic liquid cargo, and to evaluate the structural strength of the tank Hydro tests are being conducted.

The hydro test checks whether the tank returns to its original state without permanent deformation of the tank before, after, and after draining.

In the case of a small tank, there is no big problem in the process even after installing the insulating material after the hydro test, but for the large tank (10,000 m ² or more), due to the process and equipment problems, the ship is mounted in the state where the insulation material has been installed and the hydro test is performed. .

The stand-alone tank is installed on the support supporting the tank. According to the IGC code, the structural strength of the support must also be reviewed through the hydro test.

However, when the insulating material is attached in the form of a panel, a gap must exist for the formation of a leakage path, and the deformation of the tank during the hydro test by the gap cannot be accurately confirmed by appearance.

Accordingly, the present invention is to provide a tank including a deformation measuring device capable of easily grasping the deformation of the tank from the outside even when a heat insulating material is attached, and a method for measuring deformation using the tank.

The tank including the deformation measuring device according to an embodiment of the present invention is a tank 100 installed on a ship, a plurality of stud bolts 200 installed on the outer surface of the tank, and the stud bolts 200 inserted therethrough Insulation panel 300 having a hole (8), located in the through-hole, at least any one of the securing device 50 and the stud bolt (200) for coupling the insulation panel 300 to the stud bolt (200) It includes extenders extending from one and passing through the through hole (8), measurers (202, 204), and a plug (70) filled in the through hole (8).

The measurers 202 and 204 may display scales at regular intervals with an end not connected to the stud bolt 200 set to '0'.

The securing device 50 may be coupled to a thread formed in the stud bolt 200.

The scale T of the measurer 202 may include a strain measuring device extending from the stud bolt 200 and having a scale T displayed on a flat surface cut in the longitudinal direction of the stud bolt 200. have.

The sinker measurer 204 may have a plate shape with a lower portion inserted into a groove H formed in an upper portion of the stud bolt 200.

The measurer 202 may further include a reference line TS displayed on one surface of the measurer 202, and the reference line TS may be located at a boundary between the heat insulation panel 300 and the measurer 202. .

According to another embodiment of the present invention, a method for measuring deformation of a tank is provided with a stud bolt 200 to which a meter 202 is connected to the outer surface of the tank 100, and the upper portion of the meter 202 is out of the insulation panel 300. Combining the heat insulating panel 300 to the stud bolt 200 so as to protrude (S100), measuring the first distance (L1, L4) of the measurer 202 located outside the heat insulating panel 300 ( S101), the step of pouring water to the tank 100 (S102), the step of removing water in the tank 100 (S104), the third distance (L3, L6) of the measurer 202 located outside the heat insulation panel 300 ) Is measured (S105 ), and a step 106 of obtaining a distance difference between the first distances L1 and L4 and the third distances L3 and L6 is measured.

After the pouring step, the step (S103) of measuring the second distance (L2, L5) of the measurer 202 located outside the insulating panel 300 further includes.

If the difference between the first distance (L1, L4) and the third distance (L3, L6) is outside the allowable range, the step (S107) of reinforcing the tank further includes.

If the distance difference is within the allowable range, the method further includes filling the through hole 8 of the heat insulating panel 300 in which the measurer 202 is located with a plug 70.

As in the present invention, when a measuring device is connected to a stud bolt, a hydro test can be easily performed, and an operator can easily determine the degree of deformation with the naked eye without a separate device.

1 is a schematic exploded perspective view of an insulating panel according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of the heat insulating panel shown in FIG. 1.
3 is an enlarged view of a measurer according to an embodiment of the present invention.
4 is a view showing a measurer according to another embodiment of the present invention.
5 is a schematic perspective view of a securing device according to an embodiment of the present invention.
6 to 9 are views for explaining a method for measuring the deformation amount of the cargo hold according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily practice. The present invention can be implemented in many different forms and is not limited to the embodiments described herein.

In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar elements throughout the specification.

1 is a schematic exploded perspective view of an insulation panel according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the insulation panel shown in FIG. 1.

1 and 2, the cargo hold according to an embodiment of the present invention to the tank 100 having an internal space, the stud bolt 200, the stud bolt 200 installed on the outside of the tank 100 It includes a heat insulating panel 300 that is combined to surround the outside of the tank 100.

The tank 100 is a stand-alone tank of various types formed by a known technique, and only a part of the tank 100 is illustrated in FIG. 1.

The tank 100 can withstand extremely low temperatures, and may be made of aluminum or high-Mn-steel material for sufficient rigidity. In particular, high manganese steel is 0.2 to 0.6% carbon (C), 22.0 to 26.0% manganese (Mn), 0.1 to 1.0% silicon (Si), up to 0.03% phosphorus (P), up to 0.01% boron (B) and sulfur ( S) Up to 0.01%.

Stud bolts 200 are installed in a plurality at regular intervals, and can be fixed by welding to the outer surface of the tank 100.

The end of the stud bolt 200 may be connected to a measurer 202 for measuring tank deformation. The measurer 202 may be connected to at least one of the stud bolts 200. That is, since the pressure applied to the tank 100 is different depending on the location, and thus the degree of deformation may be different, it is possible to accurately grasp the degree of deformation according to the location by installing a plurality of the measuring instruments 202 rather than one severe deformation. .

3 is an enlarged view of a measurer according to an embodiment of the present invention, and FIG. 4 is a diagram showing a measurer according to another embodiment of the present invention.

2 and 3, the measurer 202 extends from the stud bolt 200, and may be formed of the same material as the stud bolt 200, but is not limited thereto, and forms the measurer 202 separately. After that, the end of the stud bolt 200 may be contacted or joined to be extended and connected.

The measurer 202 is for measuring deformation of the tank 100, and a measuring scale T capable of grasping the degree of deformation may be formed on one surface of the measurer 202. Therefore, the stud bolt 200 is formed with a screw thread, while the measurer 202 has a flat surface P on which a scale can be drawn. The flat surface P may be formed by cutting the stud bolt 200 having a cylindrical shape in the longitudinal direction, or by connecting a square pillar (not shown) to the upper portion of the cylinder.

Of course, as shown in Figure 4, after forming the groove (H) on the upper portion of the stud bolt 200, it may be fixed by inserting the measuring device 204 of the plate-like structure on which the scale T is drawn.

As such, the measurer 202 may be any shape in which the scale is drawn, and may be formed of a material having an appropriate strength, for example, a metal such as a stud bolt, so that bending does not occur during measurement.

The measurement scale T may be displayed at regular intervals as shown in FIG. 3, for example, unit intervals of 1 mm, 1 cm, etc., but is not limited thereto. As shown in FIG. 9 to be described later, only the judgment reference line TS May be displayed.

That is, in order to accurately determine the degree of tank deformation, it is preferable to display numerical values as shown in FIG. 3, but in order to determine only whether there is tank deformation or to reinforce only according to tank deformation, it is not a numerical reference line (TS) ( (See FIG. 9) to enable quick determination.

Referring again to FIGS. 1 and 2, the heat insulation panel 300 serves to insulate and prevent leakage, and is arranged to surround the outer surface of the tank 100 and may be installed in plural. Insulating panel 300 may be fixed to the outer surface of the tank 100, the insulating panel 300 is coupled to the stud bolt 200.

The insulating panel 300 is formed of a double structure of the barrier 301 and the insulating block 302, and has a structure in which the barrier 301 and the insulating block 302 are dually stacked on the tank 100.

The double-structured insulating panel 300 is a structure in which the insulating function and the leakage-blocking function are independently separated, thereby maintaining the insulating performance by the insulating block 302, and the barrier 301 additionally serves to block leakage. .

The barrier 301 and the insulating block 302 are configured in such a way that a plurality of unit cells are connected in a parallel direction to surround the tank.

The barrier 301 is composed of a material having a small heat shrinkage, such as plywood, fiber-reinforced plastic, fiber-reinforced epoxy, and fiber-reinforced propylene treated with a separate primer, and thus a primary finishing sheet connecting them. It is possible to minimize the breakage of the (31) and deformation in the thickness direction of the insulating block 302.

The thickness of the barrier 301 is 9 mm or more, and preferably 1/10 or less of the thickness of the heat insulating block 302. If the thickness of the barrier 301 is less than 9mm, leakage prevention may not be sufficient, and may be exposed to the risk of bending deformation and damage. Conversely, if it is too thick, it takes a lot of material and takes up a lot of space in the hull, so 1/10 of the thickness of the insulating block 302 is sufficient.

A plurality of barriers 301 are connected, and a gap may be generated between neighboring barriers. Therefore, a primary finishing sheet 31 made of a liquid tight material is attached between neighboring barriers. The primary finishing sheet 31 comprises aluminum tape and is connected between the barriers 301 using adhesive.

The insulating block 302 stacked on the barrier 301 may include a polyurethane foam 3 and a plywood 4 positioned on the upper or lower surface of the polyurethane foam 3. As such, the insulating block 302 is not only composed of an insulating material such as polyurethane foam, and is more suitable for preventing leakage and deformation by including a plywood.

Insulating blocks 302 are also connected in plurality, such as a barrier 301, and between the adjacent insulating blocks 302, a secondary finishing sheet 32 such as aluminum tape is attached to close the gap to prevent leakage. At this time, the bridge insulation member 33 may be installed and the secondary finishing sheet 32 may be attached to cover the bridge insulation member 33.

Between the insulating panel 300 and the tank 100, a leveling member 40 may be installed to maintain a constant space.

Meanwhile, a through hole 8 penetrating the heat insulating panel 300 is formed in the heat insulating panel 300, and the stud bolt 200 and the measurer 202 can be inserted into the through hole 8.

The fastening device 50 is fastened to the stud bolt 200 penetrating the barrier 301 so that the heat insulating panel 300 can be fixed to the stud bolt 200.

5 is a schematic perspective view of a securing device according to an embodiment of the present invention.

Referring to FIG. 5, the securing device 50 includes a nut 11 coupled to a screw thread of the stud bolt 200, a support member 12 having a pillar connected to a plate and a lower plate and into which a stud bolt is inserted. Can be.

A plug 70 is inserted in the through hole 8 to prevent leakage. At this time, when the measuring device 202 is located in the through hole 8, it is embedded with the plug 70, and the plug 70 may be made of polyurethane.

In the above embodiment, the insulating block 302 is illustrated as being connected in a single layer along the outer surface of the tank 100, but is not limited thereto, and is stacked in the thickness direction of the insulating block 302 to be connected in multiple layers (not shown). It may be.

Hereinafter, a method for measuring a deformation amount of a cargo hold including a deformation amount measurement device according to an embodiment of the present invention described above will be described with reference to the drawings.

6 to 9 are views for explaining a method for measuring the amount of deformation of the cargo hold according to an embodiment of the present invention.

Method for measuring the amount of deformation according to an embodiment of the present invention is to install the stud bolt 200 to which the meter 202 is connected to the outer surface of the tank 100, the upper portion of the meter 202 is out of the insulating panel 300 The insulating panel 300 may be coupled to the stud bolt 200 so as to protrude (S100), so that the tank 100 installed up to the insulating panel 300 may be implemented.

Thereafter, measuring the first distance (L1, L4) before pouring the tank 100 (S101), pouring the water (S102), measuring the second distance (L2, L5) (S103), the tank ( The step of removing the water in 100) (S104), and measuring the third distance (L3, L6) (S105).

The step (S101) of measuring the first distances L1 and L4 is performed before pouring the tank 100 with water, as in FIG. 6(a) or 8(a). In one embodiment, the first distance (L1) is the length of the measurer (202) located outside the insulating panel (300) by reading the scale by the operator on the walkway (walkway) (80) of FIG. (L) may be a measured value.

More specifically, as shown in (a) of FIG. 6, the first distance L1 is the distance from the '0', which is the reference of the measurer 202, to the boundary between the heat insulation panel 300 and the tank 100, The end of the measurer 202 may be referred to as '0', or '0' may be displayed in an area adjacent to the end.

Or, as shown in Figure 8 (a), the first distance (L4) is the distance between the end of the workway 80 and the end of the measuring device 202, the end of the workway 80 and the end of the measuring device 202 Can be placed on the same line.

As described above, a reference is required to measure the amount of deformation, and the first distances L1 and L4 measured based on the distance in a state in which no pressure is applied to the tank 100 are the reference.

After pouring into the tank 100 (S102), the step (S103) of measuring the second distances L2 and L5 is performed.

6(b) or 8(b), when starting pouring, the tank 100 is expanded by the pressure applied to the tank 100, and the heat insulating panel 300 is also expanded. At this time, since the stud bolt 200 is fixedly installed in the tank 100, it moves together according to the expansion of the tank 100, and the measurer 202 connected to the stud bolt 200 also moves along with the expansion of the tank 100. It will move.

The insulation panel 300 and the tank 100 have different degrees of expansion due to differences in physical properties and gaps between them, and accordingly, the length of the measurer 202 located outside the insulation panel 300, that is, the second distance L2 , L5) is different from the first distances L1 and L4.

Then, after removing the water in the tank 100 (S104), the step (S105) of measuring the third distance (L3, L6) as in Figure 6 (c) or Figure 8 (c) proceeds do.

Referring to Figure 6 (c) or Figure 8 (c), since all the water is removed from the tank 100, there is no pressure applied to the tank 100, the tank 100 has a first distance (L1, When measuring L4), it should be restored to the same state.

At this time, by measuring the length of the measurer 202 located outside the insulating panel 300, that is, the third distances L3 and L6, it is easy to know whether the tank 100 has been restored to its original state.

That is, the third distances L3 and L6 are measured, and a difference from the first distances L1 and L4 is obtained (S106), and if the difference value is 0, the tank 100 may be determined to have no deformation. On the other hand, if the difference between the first distance (L1, L4) and the third distance (L3, L6) has a value exceeding 0, it can be seen that the tank 100 is not restored to its original state and permanent deformation has occurred. .

At this time, if the difference value between the first distances L1 and L4 and the third distances L3 and L6 is within an allowable range, the hydro test is finished. Then, the through hole 8 is filled with the plug 70 to complete the production of the tank. In addition, since the measurer 202 protruding outside the tank 100 is no longer needed, it can be cut or removed.

In one embodiment, before the hydro test, the through hole 8 is filled with the plug 70 into which the tester 202 is inserted, and the hydro test is performed. After the hydro test, the plug 70 into which the tester 202 is inserted is removed and then closed. The through hole 8 may be finally filled through the plug 70.

However, if the difference between the first distances L1 and L4 and the third distances L3 and L6 is outside the allowable range, reinforcement work is performed according to the degree of deformation. Then, as described above, the hydro test is repeated until the difference between the first distances L1 and L4 and the third distances L3 and L6 is within an allowable range.

In the above embodiment, a method for accurately grasping the degree of deformation using a measurer displayed in mm is mainly described, but the present invention is not limited thereto, and only the degree of deformation can be quickly determined.

When the tank 100 in which the insulation panel 300 is installed is prepared, as shown in FIG. 9, a reference line TS is displayed on the boundary between the insulation panel 300 and the tank 100. Then, when pouring water, the boundary between the insulating panel 300 and the tank 100 moves according to the degree of expansion of the tank 100 and the insulating panel 300.

At this time, depending on the degree of expansion of the tank 100, the reference line TS may be moved into the through hole 8 of the heat insulation panel 300 or may be positioned at a distance from one surface of the heat insulation panel 300.

Thereafter, after removing the water in the tank 100, the position of the reference line TS is confirmed. If there is no deformation of the tank 100, the reference line TS is equally positioned at the boundary between the insulation panel 300 and the measurer 202 before pouring. However, when deformation of the tank 100 occurs, it can be seen that the reference line TS is moved (see arrow) to deform the tank 100.

If deformation occurs, the tank may be damaged depending on the degree of deformation, so reinforcement is performed (S107).

When the method of reinforcing varies according to the degree of deformation, it is preferable to measure the deformation by measuring the distance using a scale as shown in FIG. 6, but when the deformation occurs regardless of the degree of deformation, when reinforcing is essential As shown in FIG. 9, a hydro test may be performed using only the reference line TS.

Thus, as in the present invention, by connecting the tester 202 to the stud bolt 200, it is possible to easily perform a hydro test and the operator can easily determine the degree of deformation with the naked eye without a separate device.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and it is possible to carry out various modifications within the scope of the claims and detailed description of the invention and the accompanying drawings. It is natural to fall within the scope of.

50: fastening device 70: plug
100: tank 200: stud bolt
202, 204: measurer 300: insulation panel

Claims (10)

Tank 100 installed on the ship,
A plurality of stud bolts (200) installed on the outer surface of the tank,
Insulation panel 300 having a through-hole 8 into which the stud bolt 200 is inserted,
A securing device 50 positioned in the through-hole and coupling the insulating panel 300 to the stud bolt 200,
Measurers 202 and 204 extending from at least one of the stud bolts 200 and penetrating the through hole 8,
Plug 70 filled in the through hole 8
Tank comprising a strain measuring device comprising a. In claim 1,
The measurer (202, 204) is a tank including a strain measuring device in which a scale is displayed at regular intervals with an end not connected to the stud bolt 200 as '0'. In claim 1,
The securing device 50 is a tank including a strain measuring device coupled to a thread formed in the stud bolt 200. In claim 1,
The scale T of the measurer 202 extends from the stud bolt 200 and includes a strain measuring device in which the scale T is displayed on a flat surface cut in the longitudinal direction of the stud bolt 200. Tank. In claim 1,
The sinker 204 is a tank including a deformation measuring device which is a plate shape with a lower portion inserted into a groove H formed in an upper portion of the stud bolt 200. In claim 1,
The measurer 202 is a reference line (TS) displayed on one surface of the measurer 202
Further comprising,
The reference line (TS) is a tank including a deformation measuring device located at the boundary between the heat insulating panel 300 and the measurer 202. The stud bolt 200 is installed on the outer surface of the tank 100 to which the measurer 202 is connected, and the heat insulating panel is provided on the stud bolt 200 so that the upper portion of the measurer 202 protrudes out of the heat insulating panel 300. 300) combining (S100),
Measuring a first distance (L1, L4) of the measurer 202 located outside the insulating panel 300 (S101),
Injecting the tank 100 (S102),
Removing the water in the tank 100 (S104),
Measuring a third distance (L3, L6) of the measurer 202 located outside the insulating panel 300 (S105),
Step 106 of obtaining a distance difference between the first distance (L1, L4) and the third distance (L3, L6)
Deformation measuring method of the tank comprising a. In claim 7,
After the pouring step,
Measuring a second distance (L2, L5) of the measurer 202 located outside the insulating panel 300 (S103)
Deformation measuring method of the tank further comprising. In claim 7,
If the difference between the first distance (L1, L4) and the third distance (L3, L6) is outside the allowable range, step of reinforcing the tank (S107)
Deformation measuring method of the tank further comprising. In claim 7,
If the distance difference is within the allowable range,
Filling the through-hole (8) of the heat insulation panel 300 in which the measuring unit 202 is located with a plug (70)
Deformation measuring method of the tank further comprising.

Images