KR101624444B1 - Oil tank of tanker - Google Patents

Abstract

The oil tank 21 of the oil tanker 1 is formed by the bottom plate 11 and the side plate 13 and is divided into a plurality of tanks by the partition 30. The oil vat has a plurality of arbors (40) arranged on the at least one surface of the inner surface of the side plate and the surface of the partition wall in parallel in the vertical direction and extending in the horizontal direction. The stiffener has a drain hole (42a) formed so as to penetrate the flat plate portion (42b) and the flat plate portion, respectively, and the drain holes formed in the respective stiffeners are arranged so as to overlap with other members when viewed from above in the vertical direction. Thereby, an oil well structure capable of suppressing corrosion locally generated in the oil tank of the tanker of the double hull structure is provided.

Description

{OIL TANK OF TANKER}

The present invention relates to an oil tank of a tanker excellent in corrosion resistance.

In a tanker that transports crude oil or the like, a double hull structure is required to prevent the crude oil loaded on the tanker from leaking out of the tank when the bottom or outer shell of the tanker is broken.

1 is a longitudinal sectional view schematically showing a configuration of a tanker having a double hull structure. 1 is a sectional view of a tanker taken along a direction perpendicular to the longitudinal direction of the tanker. 1, the bottom of the tanker 1 is constituted by a bottom bottom shell 10 and a bottom bottom shell 11, and the side of the tank is constituted by a side shell outer shell 12 and a side shell inner shell 13 . The tanker 1 has a double hull structure composed of an outer plate composed of a bottom shell plate 10 and a side shell plate 12 and an inner plate composed of a bottom bottom plate 11 and a side side inner plate 13. [

The upper deck 14 is formed at the upper ends of the side shell 12 and the side inner 13. A ballast tank 20 is formed in a space formed between the bottom shell sheathing 10 and the bottom bottom shell 11 and between the side shell sheath 12 and the side inner sheath 13. On the other hand, in the space surrounded by the bottom bottom plate 11, the side side inner plate 13 and the upper deck 14, the oil tank 21 is formed.

In the oil tank 21 of the tanker 1, for example, two longitudinal partition walls 30 extending in the longitudinal direction of the tanker 1 are formed. The oil tank 21 is partitioned into one center tank 31 and two wing tanks 32 by these longitudinal partition walls 30. In addition, a partition wall transverse beam 41 projecting in a direction perpendicular to the longitudinal direction of the tanker 1 is provided in the oil tank 21 from the surface of the longitudinal partition 30 and the inner surface of the side inner plate 13 2).

A plurality of planar stiffeners 40 extending in the front and rear direction of the tanker 1 are provided on the surface of the bottom inner shell 11 and the side inner shell 13 on the ballast tank 20 side, Are provided at predetermined intervals. A plurality of stiffeners 40 are also provided on the surface of the longitudinal partition 30 on the side of the center tank 31 in the same manner as the side inner plates 13, for example. These stiffeners 40 are used as reinforcing members for increasing the rigidity of the bottom inner plate 11 and the side inner plate 13. [

In the tanker 1 of the double-hull structure structured as described above, the ballast tank 20 formed between the bottom bottom shell 10 and the bottom bottom shell 11, and between the side shell outer shell 12 and the side inner shell 13, Is loaded. Incidentally, crude oil is loaded in the oil tank 21 formed by the bottom bottom plate 11 and the side side inner plates 13. [ Therefore, the steel plates constituting the bottom bottom plate 11 and the side inner plates 13 are exposed under the corrosive environment of seawater and crude oil.

As a result, it is known that local corrosion occurs in the bottom bottom plate 11 and the side side inner plate 13 at a relatively high corrosion rate of about several millimeters per year. As a countermeasure against this corrosion, a generally painted surface is applied to the bottom inner board 11 and the side inner board 13. In addition, in order to reduce the frequency of maintenance such as re-coating, the bottom inner plate 11 and the side inner plate 13 are formed of a special steel plate having high corrosion resistance (for example, Patent Documents 1 to 4) .

Japanese Patent Application Laid-Open No. 2001-214236 Japanese Patent Application Laid-Open No. 2004-204344 Japanese Patent Application Laid-Open No. 2005-23421 Japanese Patent Application Laid-Open No. 2007-270196

1, a plurality of flat streaks 40 extending in the front-rear direction of the tank 1 are provided on the surface of the longitudinal bulkhead 30 formed in the oil tank 21. As shown in Fig. Fig. 2 is a perspective sectional view schematically showing a configuration in the vicinity of the arbor 40 disposed on the longitudinal partition 30 as described above. 2, only four parallel staving elements 40 arranged in the vertical direction are shown. In general, however, more strakes 40 are arranged parallel to each other in the vertical direction in the longitudinal bulkhead 30 do.

As can be seen from Fig. 2, the arbor 40 extends substantially horizontally from the surface of the longitudinal partition 30. Therefore, even when the crude oil or the like stored in the oil tank 21 is discharged to the outside, the oil or the sludge remains on the arbors 40, particularly near the junction of the arboreous material 40 and the longitudinal partition 30 There is a case. Therefore, it is conceivable to form the drain hole 42a in the arbor 40 and to make the arbor 40 slightly inclined toward the drain hole 42a in order to suppress the residual of the crude oil or the like. Thus, when crude oil or the like stored in the oil tank 21 is discharged to the outside, the crude oil or the like on the discharge guard 40 flows along the inclination of the discharge guard 40 toward the drain hole 42a, So that the crude oil or the like is prevented from remaining on the yarn rest material 40. As a result,

Incidentally, when the drain hole 42a is formed in the arbor 40, as shown in Fig. 2, the drain hole 42a is formed in the same direction as the arbor 42a arranged parallel to the plurality of parallel arrays 40 in the vertical direction It may be arranged on a vertical line. As a result, the crude oil or the like, which has been drained from the drain hole 42a of the upper stiffening material 40, flows downward without colliding with the other stiffening material 40. Therefore, it is possible to more reliably prevent the crude oil or the like from remaining on each of the yarn restraints 40.

However, the inventors of the present invention have found out that the occurrence of local corrosion is investigated with respect to the oil tank of a tanker constructed as shown in Fig. 2 by using a painted steel plate subjected to a painted surface or a special steel plate (corrosion-resistant steel plate) . As a result, it was found that the local corrosion occurred on the side of the oil tank side of the bottom inner plate and concentrated in the vicinity of the longitudinal bulkhead dividing the oil tank into a plurality of compartments.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an oil tank capable of suppressing corrosion locally occurring in the oil tank of a tanker.

The present inventors further investigated the local corrosion occurring in the vicinity of the longitudinal bulkhead dividing the inside of the oil tank into a plurality of compartments on the oil tank side of the bottom bottom plate. As a result, the occurrence of local corrosion substantially coincides with the position immediately below the drain hole formed in the reinforcing material provided as the reinforcing material of the longitudinal bulkhead, and the local corrosion is hardly generated at a position other than the position immediately below the drain hole .

The inventors of the present invention have found that the direct collision of the oil flowing down from the drain hole with the bottom inner plate is a cause of local corrosion occurring in the oil tank. Further, the inventors of the present invention succeeded in suppressing local corrosion caused by corrosion in the oil tank of the tanker, that is, oil leakage from the drain hole, by installing the anti-collision structure in the oil tank.

The present invention has been made based on the above-described knowledge, and its main points are as follows.

(1) An oil tanker of an oil tanker formed by a bottom plate and a side plate and divided into a plurality of basins by partition walls, wherein at least one of the inner surface of the side plate and the surface of the partition wall is arranged in parallel Wherein the stiffener has a flat plate portion and a drain hole formed to penetrate through the flat plate portion, the flat plate portion being formed in each of the stamina when viewed from the top in the vertical direction And the drain hole is disposed so as to overlap with the other member.

(2) The oil tanker of (1), wherein the other member is a fluid impingement member provided below the drain hole of one of the stiffeners.

(3) The drain holes formed in the arrays arranged side by side in the vertical direction are arranged aligned in the vertical direction, and the fluid impingement members are arranged to overlap the drain holes aligned in the vertical direction when viewed in plan The oil tanker oil tank described in (2) above.

(4) The oil tanker according to (2) or (3), wherein the fluid impingement member is disposed at a position where the distance in the vertical direction from the bottom plate is 15 m or less.

(5) The oil tanker of (2) or (3), wherein the fluid impingement member is disposed at a position where the distance in the vertical direction from the bottom plate is 2 m or less.

(6) The oil tanker according to any one of (2) to (5), characterized in that the fluid impingement members are disposed below the lowermost one of the plurality of the stiffeners disposed in parallel to each other in the vertical direction. Of oil.

(7) The oil tanker of any one of (2) to (6), wherein the fluid impingement member has the same outer shape as the armband disposed adjacent to the fluid impingement member.

(8) The stamper according to (8), wherein the stiffener is arranged so that a drain hole formed in each stamper overlaps with a flat plate of the stiffener when viewed from the top in the vertical direction Oil tanker of the oil tanker described in 1).

(9) A plurality of stiffeners other than the other stiffeners among the plurality of stiffeners disposed side by side in the vertical direction are arranged so that the drain holes are aligned in the vertical direction, and the flat portion of the stiffener Is arranged so as to overlap the drain holes arranged in the vertical direction when viewed from the side of the oil tank.

(10) The oil tanker according to (8) or (9), wherein the other stiffener is disposed at a position where the distance in the vertical direction from the bottom plate is 15 m or less.

(11) The oil tanker according to (8) or (9), wherein the other stiffener is disposed at a position where the distance in the vertical direction from the bottom plate is 2 m or less.

(12) The oil tanker according to any one of (8) to (11), wherein the remaining one of the stiffeners is a stiffener disposed at the bottom of the plurality of stiffeners disposed in parallel in the vertical direction. .

(13) At least one of the floors arranged at a position where the distance in the vertical direction from the bottom plate is 15 m or less, among the floors arranged at a distance from one another in the vertical direction, The oil tanker according to (8), wherein the holes are arranged so as not to overlap each other when viewed in a plan view.

(14) At least one of the floors arranged at a distance of 2 m or less in the vertical direction from the bottom plate among the floors arranged at a distance from one another in the vertical direction with a space therebetween is a drain The oil tanker according to (8), wherein the holes are arranged so as not to overlap each other when viewed in a plan view.

According to the present invention, it is possible to suppress corrosion locally occurring in the oil tank of the tanker.

1 is a longitudinal sectional view showing a schematic structure of a tanker having a double hull structure.
Fig. 2 is a perspective sectional view schematically showing a configuration in the vicinity of the repellent material provided on the longitudinal bulkhead.
Fig. 3 is a perspective sectional view schematically showing a configuration in the vicinity of the embers according to the first embodiment of the present invention. Fig.
Fig. 4 is a sectional plan view taken along the line IV-IV in Fig. 3, and schematically shows a configuration in the vicinity of the repellent material.
Fig. 5 is a perspective sectional view schematically showing a configuration in the vicinity of an embossment in the first modification of the first embodiment. Fig.
6 is a diagram showing the relationship between the height of the drain holes continuously present from the bottom and the occurrence probability of local corrosion.
7 is a perspective sectional view schematically showing a configuration in the vicinity of an embossment in the second modification of the first embodiment.
Fig. 8 is a perspective sectional view schematically showing a configuration in the vicinity of the repellent material in the third modification example of the first embodiment. Fig.
Fig. 9 is a perspective sectional view schematically showing a configuration in the vicinity of an embossment according to a second embodiment of the present invention. Fig.
10 is a perspective sectional view schematically showing a configuration in the vicinity of an embroidery material in a modified example of the second embodiment.
Fig. 11 is a perspective sectional view schematically showing a configuration in the vicinity of an embroidery material according to a third embodiment of the present invention. Fig.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The tanker 1 having the oil tank according to the present invention basically has the same configuration as the tanker shown in Fig.

That is, the tanker 1 has a double-hull structure including an outer plate having a bottom bottom shell 10 and a side shell outer shell 12, and an inner plate having a bottom bottom shell 11 and a side shell inner shell 13. [ An upper deck 14 is formed at an upper end of the side outside sheathing 12 and the side inside sheeting 13. A ballast tank 20 is formed between the outer plate (bottom shell plate 10 and side shell plate 12) and the inner plate (bottom inner shell 11 and side shell inner plate 13). In the space surrounded by the bottom bottom plate 11, side side inner plate 13 and upper deck 14, oil vat 21 is formed. In the example shown in Fig. 1, the tanker 1 has a double-hull structure. However, the tanker 1 may have another structure such as a triple-hull structure if it has a bottom plate and a side plate that form the oil vessel 21. [

In the oil vat 21 according to the present invention, for example, two longitudinal partition walls 30 extending in the front-rear direction of the tanker 1 are formed similarly to the oil vat shown in Fig. The oil tank 21 is divided into a center tank 31 and a wing tank 32 by this longitudinal partition wall 30.

1, the bottom bottom plate 11 and the side inner plate 13 on the ballast tank 20 side surface are provided with a bottom bottom plate 11 and a bottom bottom plate 12 on the side of the ballast tank 20. In the oil tank 21 according to the present invention, As the reinforcing member for increasing the rigidity of the side inner plate 13, a plurality of flat streaks 40 are provided. The stiffener 40 extends horizontally in the front-rear direction of the tanker 1. (In reality, the stiffener 40 may not be completely horizontal due to manufacturing errors, etc., Including ± 10 ° or ± 5 °. The rain gutters 40 provided on the bottom bottom board 11 extend substantially vertically in the front and rear direction of the tanker 1 and extend in the lateral direction (direction perpendicular to the front and rear direction of the tanker 1) . The floors 40 provided on the side inner plate 13 extend substantially horizontally in the front-rear direction of the tanker 1 and are arranged at predetermined intervals in the vertical direction. A plurality of stiffeners 40 are also provided on the surface of the longitudinal partition 30 on the side of the center tank 31 in the same manner as the side inner plates 13, for example.

In the example shown in Fig. 1, the ribs 40 are formed on the surface of the bottom inner plate 11 and the side inner plate 13 on the ballast tank 20 side and in the center tank 31 of the longitudinal partition 30, As shown in Fig. However, it is not limited to these locations, but may be provided on the surface of the bottom inner plate 11 and the side inner plate 13 on the side of the oil tank 21 or on the surface of the longitudinal partition 30, It may be provided on the surface of the wing tank 32 side.

3 is a perspective sectional view schematically showing a configuration in the vicinity of the arbors 40 provided on the longitudinal partition 30. 3, a plurality of partition wall transverse beams 41 extending substantially vertically in a direction perpendicular to the longitudinal direction of the tanker 1 are provided in the longitudinal partition wall 30. As shown in Fig. Each of the artefacts 40 has a flat plate portion 42b and a drain hole 42a formed to penetrate the flat plate portion 42b. The flat plate portion 42b of each stub 40 is slightly inclined toward the drain hole 42a. In addition, for the arbors 40 arranged parallel to each other in parallel in the vertical direction, the drain holes 42a are formed on the same vertical line. In other words, the drain holes 42a formed in the arbors 40 arranged in parallel to each other in parallel in the vertical direction are arranged so as to be aligned with each other in the vertical direction, that is, the positions of the drain holes 42a As shown in Fig.

Incidentally, in the oil vat 21 of the first embodiment of the present invention, as shown in Fig. 3, among the arborescent materials 40 arranged side by side in the vertical direction, A fluid impingement member 43 in the form of a flat plate is provided at a position immediately below the drain hole 42a. In this embodiment, the fluid impingement member 43 is welded to the longitudinal partition wall 30. As shown in Fig. 4, the fluid impingement member 43 is formed to have an outer shape larger than the diameter of the drain hole 42a. As a result, the fluid impingement member 43 is formed such that the entire drain hole 42a overlaps the fluid impingement member 43 in plan view, As shown in Fig.

According to the oil vat 21 of the present embodiment configured as described above, for example, when crude oil or the like is discharged from the oil vat 21, the crude oil or the like discharged from the drain hole 42a, Collides with the fluid impingement member 43 and is dispersed on the fluid impingement member 43. The dispersed crude oil or the like flows down from the side of the fluid collision member 43 and then reaches the bottom inner plate 11. Therefore, even if crude oil or the like has a high kinetic energy (or speed) because the crude oil or the like flows down a long distance from the drain hole 42a of the upper stiffening material 40, the crude oil or the like, Collides with the fluid collision member 43 without direct collision. As a result, high kinetic energy is absorbed by the fluid collision member 43, and when the crude oil or the like reaches the bottom inner plate 11, the kinetic energy thereof is considerably low. As a result, it is possible to suppress the local corrosion of the bottom bottom plate 11, which is caused by the falling of the oil or the like from the drain hole 42a.

In the present embodiment, the fluid impingement member 43 is formed such that the end portion of the fluid impingement member 43 opposite to the longitudinal partition wall 30 is located closer to the longitudinal partition wall 30 than the end portion of the arbor 40 as seen in plan view Respectively. This prevents the fluid impingement member 43 from giving disturbance to the flow of the crude oil in the oil vessel 21 when loading and dropping crude oil into the oil vessel 21 and the like. In addition, all of the members constituting the above-described tanker 1 are steel plates for ships such as coated steel plates and corrosion resistant steel plates.

In order to prevent the crude oil or the like falling from the drain hole 42a from directly colliding with the upper surface of the bottom bottom plate 11 by using the fluid collision member 43, It is also conceivable to directly couple the fluid impingement member 43a as a sacrificial material to the bottom inner plate 11 at a position immediately below the drain hole 42a. However, it is obligatory to periodically check whether the thickness reduction amount of the bottom bottom board 11 falls within the specified value by the classification rule, so that the fluid collision member 43a as the sacrificial material becomes the obstacle . Therefore, although the practice is limited under the classification rules of the present invention, the form of directly coupling the fluid impact member 43a to the bottom inner plate 11 as a sacrificial material is within the technical scope of the present invention.

Considering the results of an investigation by the inventors that local corrosion is hardly recognized at locations other than immediately below the drain holes 42a, the inventors of the present invention have found that the end portions of the arbor 40 on the opposite side to the longitudinal barrier ribs 30 It can be said that local corrosion does not occur depending on the flow F of crude oil or the like flowing down (see FIG. 2). Therefore, in the above-described embodiment, the respective stiffeners 40 are inclined toward the drain holes 42a, but the entire stiffeners 40 may not necessarily be inclined toward the drain holes 42a. For example, the arbor 40 may be configured to be inclined toward the end of the arbor 40 opposite to the longitudinal barriers 30, in the vicinity of the end opposite to the longitudinal barriers 30 .

Next, a first modification of the first embodiment of the present invention will be described with reference to Figs. 5 and 6. Fig. In the first embodiment, the fluid collision members 43 are disposed below the drain holes 42a of the yarn restraint 40 disposed at the lowermost among the yarn restraints 40 arranged in parallel in the vertical direction . 5, in this modification, the fluid impingement member 44 is disposed between the bottommost stiffener member 40 disposed at the lowest position and the second stiffener member 40 positioned from the bottom position. The fluid impingement member 44 is formed such that the entire drain hole 42a of the second arcuate material 40 from the bottom (that is, the arbor 40 disposed immediately above the fluid impingement member 44) The fluid impingement member 44 is disposed so as to overlap with the fluid impingement member 44 as seen in FIG. In other words, the fluid impingement member 44 is disposed so that the entire drain hole 42a of the second arcuate material 40 from the bottom is located inside the fluid impingement member 44 when viewed in plan view.

5, the fluid impingement member 44 is disposed immediately below the second stiffening member 40 from the bottom. However, the fluid impingement member 44 may be provided on the third stiffening member 40, Or may be disposed directly below the other stamper 40. However, the fluid impingement member 44 is disposed at a position where the distance from the bottom bottom plate 11 in the vertical direction is 15 m or less, preferably 8 m or less, more preferably 2 m or less.

6 is a diagram showing the relationship between the height of the drain holes existing on the same vertical line continuously from the bottom plate and the occurrence probability of local corrosion. In other words, Fig. 6 shows the relationship between the height of the arbor 40 positioned at the uppermost position among the arbor 40 on which the drain holes are located on the same straight line continuously from the bottom plate, and the occurrence probability of local corrosion. As can be seen from the figure, when the height of the drain holes continuously existing from the bottom plate is higher than 15 m, the occurrence probability of local corrosion is 100%. On the other hand, when the height of the drain holes continuously existing from the bottom plate is 15 m or less, the incidence of local corrosion is lowered.

As can be seen from FIG. 6, when the height of the drain holes continuously existing from the middle plate is about 10 m, the probability of occurrence of local corrosion is about 80%, about 50% when the distance is about 8 m, about 40% 25%, 20% from 4m, and 10% from 3m. When the height of the drain hole is 2 m or less, the occurrence probability of local corrosion is approximately 0%. Therefore, when the position at which the fluid impingement member 44 is disposed is set to a position where the distance in the vertical direction from the bottom bottom plate 11 is 15 m or less, the probability of occurrence of local corrosion Can be reduced. The position where the fluid impingement member 44 is disposed is set to a position where the distance in the vertical direction from the bottom bottom plate 11 is 8 m or less as compared with the case where the fluid impact member 44 is not provided, Or less. If the position where the fluid impingement member 44 is disposed is set to a position where the distance in the vertical direction from the bottom bottom board 11 is 2 m or less, the occurrence probability of local corrosion can be made approximately 0%.

By increasing the position of the fluid impingement member 44 in comparison with the first embodiment, the kinetic energy (speed) of the fluid or the like colliding with the fluid impingement member 44 can be lowered. As a result, local corrosion can be prevented from occurring in the fluid impingement member (44).

Next, a second modification of the first embodiment of the present invention will be described with reference to Fig. In the above embodiment, only one fluid impingement member is disposed for a plurality of drain holes 42a aligned in a row. In contrast to this, in the present modified example, in addition to the fluid impingement member 43 provided below the lowermost stiffener 40, the third stiffener 40 from the bottom and the second stiffener 40 from the bottom The fluid impingement member 45 is disposed.

When a plurality of fluid impingement members 43 and 45 are provided for a plurality of drain holes 42a aligned in a row in this manner, kinetic energy (velocity ) Can be lowered. Incidentally, the kinetic energy (velocity) of the crude oil or the like colliding with the bottom bottom inner plate 11 is also lowered by disposing the fluid impingement member 43 disposed at the lowermost one of the plurality of fluid impingement members 43, . As a result, local corrosion can be reduced in both of the fluid collision members 43 and 45 and the bottom bottom plate 11. [

Next, a third modification of the first embodiment of the present invention will be described with reference to Fig. In the above-described embodiment, the collision-avoiding structure is formed by using the flat-plate-shaped fluid impact member 43. However, the shape of the fluid impingement member 43 is not limited to the flat plate shape. The fluid impingement member may have any shape as long as the entire drain hole 42a overlaps with the fluid impingement member 43 in plan view. In this modification example, a pyramidal fluid collision member 46 as shown in Fig. 8 is used as an example.

Next, a second embodiment of the present invention will be described with reference to Fig. The configuration of the oil vat in the second embodiment is basically the same as the configuration of the oil vat in the first embodiment. Here, in the first embodiment, the arbor 40 is formed so that the drain hole 42a is formed on the same vertical line. The reason for this configuration is that it is possible to more reliably suppress the residual of the crude oil or the like on each of the stiffeners 40 and to manufacture a plurality of stiffeners 40 of the same shape as described above, 40 to the longitudinal barrier ribs 30 in the vertical direction, thereby suppressing the drying cost. Therefore, the arbor 40 is not necessarily configured so that the drain hole 42a is formed on the same vertical line.

Therefore, in the second embodiment, for example, as shown in Fig. 9, a drain hole 42a formed in the arbor 41a disposed at the lowermost one of the arborescent materials 40 arranged in parallel to each other in the vertical direction And is arranged so as not to overlap with the drain hole 42a of the arbor 40 positioned above the plate 40 in a plan view. In other words, the drain hole 42a formed in the lowermost arrays 40a is disposed so as to overlap with the flat plate portion 42b of the arbor 40 positioned above it in plan view. Particularly, in the present embodiment, the arbor 40 except the arbors 40a disposed at the lowest position is arranged such that the drain holes 42a thereof are aligned with each other in the vertical direction. Therefore, only the position of the drain hole 42a is different from that of the other stiffeners 40 only in the lowest stiffener 40a. Incidentally, in the second embodiment, the fluid impingement member as in the first embodiment is not provided.

The oil or the like that flows into the drain hole 42a of the arboreous material 40a located at the lowermost position in the oil vat 21 of the second embodiment structured as described above is discharged to the drain of the arbor 40, After flowing down from the hole 42a, it collides with the upper surface of the temporary stub 40a and the kinetic energy (speed) is lowered. As a result, the kinetic energy (descending speed) of the crude oil or the like flowing down from the drain hole 42a of the arboreous material 40a located at the lowest position can be lowered. 9, the same effects as those obtained when the fluid collision member 43 is provided can be obtained without providing the fluid collision member 43 by arranging the arbor 40, 40a.

9, the fluid collision member 43 becomes unnecessary when the stiffeners 40 and 40a are disposed. As a result, the welding operation and the work at a high place accompanied by the welding operation are also unnecessary, so that the operation cost and the safety at the drying site are improved as compared with the case where the fluid collision member 43 is provided.

In the example shown in Fig. 9, the position of the drain hole 42a of the arbor 41a disposed at the lowest position is different from the position of the drain hole 42a of the other arbor 40. [ However, the stiffener for changing the position of the drain hole 42a does not necessarily have to be the stiffener 40a disposed at the lowest position, and it is also possible to use other stiffeners such as a second stiffener from the bottom or a third stiffener from the bottom do. In addition, the position of the drain hole 42a may be changed not only with respect to one of the floors arranged side by side in the vertical direction, but also with respect to the plurality of floors.

However, the stiffener for changing the position of the drain hole 42a is disposed at a position where the distance in the vertical direction from the bottom bottom board 11 is 15 m or less, preferably 8 m or less, more preferably 2 m or less. In other words, of the stiffeners 40 arranged in parallel to each other in the vertical direction at a distance from each other, the distance in the vertical direction from the bottom inner plate 11 is 15 m or less, preferably 8 m or less, more preferably 2 m or less At least one of the umbrellas arranged in the vertical direction is arranged such that the drain holes 42a of the arbor 40 arranged adjacent to the vertical direction do not overlap each other when viewed in plan. As described above with reference to Fig. 6, the occurrence probability of local corrosion can be reduced by bringing the position of the stiffener 40, which changes the position of the drain hole 42a, close to the bottom inner plate 11. [

9, when the position of the drain hole 42a is changed with respect to a part of the arbor 40a, on the upper surface of the arbor 40a, Crude oil or the like falling from the drain hole 42a collides. In this case, local corrosion may occur in the stiffener 40, which is a structural member, and it is necessary to replace the stiffener 40 when corrosion occurs. 10, the sacrificial material 61 is formed on the upper surface of the arbor 40 and immediately below the drain hole 42a of the arbor 40 installed above, for example, To prevent corrosion of the arbors (40).

Next, a third embodiment of the present invention will be described with reference to Fig. The oil reservoir configuration of the third embodiment is basically the same as that of the oil reservoir of the first embodiment. However, in the oil vat according to the third embodiment, as the fluid impingement member, the member 50 having the same shape and external appearance as those of the arboreal material 40 and without a drain hole is provided.

As can be seen from Fig. 11, in the oil vat of the present embodiment, the fluid impingement member 50 is provided below the arteriess 40 positioned at the lowest position. The fluid impingement member 50 has the same outer shape as the arbor 40 and does not have a drain hole. The fluid impingement member 50 may be provided with a clogging member for clogging the drain hole 42a at a position corresponding to the drain hole 42a of the arbor 40. [ Even when such a member 50 is used as the fluid collision member, the same effect as that of the fluid collision member 43 of the first embodiment can be obtained.

Incidentally, as the fluid impingement member 50, the yarn material 40 before the punching process for forming the drain hole 42a can be used. As a result, it is unnecessary to separately manufacture a press mold for the fluid impingement member 50, and as a result, the manufacturing cost can be reduced.

11, the fluid impingement member 50 is disposed below the arterioscleral material 40 disposed at the lowermost position. However, the fluid impingement member 50 may be provided on the other side, such as the second and third arcs 40, Or may be disposed directly below the stub 40. In this case, however, the fluid impingement member 50 is disposed at a position where the distance from the bottom bottom plate 11 in the vertical direction is 15 m or less, preferably 8 m or less, more preferably 2 m or less.

In the example shown in Fig. 11, the stiffeners 40 arranged side by side in the vertical direction are all formed to have the same outer shape. However, the stiffener 40 does not necessarily have the same outer shape, but may have a different width (length in the direction perpendicular to the longitudinal direction) for each stiffener 40, for example. In such a case, the fluid impingement member 50 has the same outline as at least one of the plurality of arbor 40 arranged side by side in the vertical direction. For example, the fluid impingement member 50 has the same appearance as the armband 40 disposed adjacent to the fluid impingement member 50. [

In addition, in the present invention, the styrofoam member has a drain hole formed so as to penetrate the flat plate portion and the flat plate portion, respectively, It can be said that the drain holes formed in the respective arrays are arranged so as to overlap with the other members.

While the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to these examples. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

INDUSTRIAL APPLICABILITY The present invention is useful in suppressing corrosion in a tank of a tanker that transports crude oil or other liquid.

1: tanker
10: bottom shell
11: bottom plate
12: Side shell
13: side inner plate
14: Upper deck
20: Ballast tank
21: Oyster
30: longitudinal bulkhead
31: Center tank
32: Wing tank
40:
41: Bulkhead transverse beam
42a: drain hole
42b:
43, 44, 45, 46, 50: fluid impingement member
61: Sacrifice
F: Flow

Claims (14)

1. An oil tanker oil tank formed by a bottom plate and a side plate and divided into a plurality of tanks by partition walls,
And at least one of the inner surface of the side plate and the surface of the partition wall is provided with a plurality of arrays extending in the horizontal direction,
Wherein the stiffener has a drain hole formed so as to penetrate through the flat plate and the flat plate, respectively, the drain hole formed in each of the stamens when viewed from above in the vertical direction is arranged to overlap with the other member, , And a fluid impingement member provided below the drain hole of one of the stiffeners. The fluid collision member according to claim 1, wherein the drain holes formed in the arrays arranged in parallel to the vertical direction are arranged in a vertical direction, and the fluid collision members are arranged to overlap with the drain holes aligned in the vertical direction in a plan view The oil tanker oil tank. The oil tanker of claim 1 or 2, wherein the fluid impingement member is disposed at a position where the distance in the vertical direction from the bottom plate is 15 m or less. The oil tanker according to claim 1 or 2, wherein the fluid impingement member is disposed at a position where the distance in the vertical direction from the bottom plate is 2 m or less. The oil tanker according to any one of claims 1 to 3, wherein the fluid impingement members are disposed below the lowermost one of the plurality of side floats arranged in parallel to each other in the vertical direction. The oil tanker of claim 1 or 2, wherein the fluid impingement member has the same outer shape as the armlink disposed adjacent to the fluid impingement member. 1. An oil tanker oil tank formed by a bottom plate and a side plate and divided into a plurality of tanks by partition walls,
And at least one of the inner surface of the side plate and the surface of the partition wall is provided with a plurality of arrays extending in the horizontal direction,
The stiffener has a drain hole formed to penetrate the flat plate and the flat plate, respectively. The drain hole formed in each stiffener when viewed from the top in the vertical direction overlaps the other member,
Wherein the other member is another umbrella member,
Wherein the stiffener has a drain hole formed in each of the stamper elements so as to overlap the flat plate portion of the other stiffener member when viewed from the top in the vertical direction,
Wherein a plurality of stiffeners other than the other stiffeners among the plurality of stiffeners arranged in the vertical direction are arranged so that the drain holes are aligned in the vertical direction and the flat plate portion of the stiffener And are arranged to overlap the drain holes arranged in the vertical direction. The oil tanker according to claim 7, wherein the other stiffener is disposed at a position where the distance in the vertical direction from the bottom plate is 15 m or less. The oil tanker according to claim 7, wherein the other stiffener is disposed at a position where the distance in the vertical direction from the bottom plate is 2 m or less. 10. The oil tanker according to any one of claims 7 to 9, wherein the other stiffener is a stiffener disposed at the bottom of the plurality of stiffeners disposed in parallel in the vertical direction. 8. The apparatus according to claim 7, wherein at least one of the umbrellas arranged at a distance of not more than 15 m in the vertical direction from the bottom plate among the plurality of the umbrellas spaced apart from each other by a distance in the vertical direction, And the drain holes of the stiffener are arranged so as not to overlap each other when viewed in a plan view. 8. The apparatus according to claim 7, wherein at least one of the stiffeners arranged at a distance of 2 m or less in the vertical direction from the bottom plate among the stiffeners arranged at a distance from each other in the vertical direction, And the drain holes of the stiffener are arranged so as not to overlap each other when viewed in a plan view. delete delete

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