TWI510414B - Oil tanker - Google Patents

Description

Oil tanker Field of invention

The present invention relates to an oil sump of an oil tanker having excellent corrosion resistance.

Background of the invention

In the oil tanker conveying crude oil, when the outer bottom plate or the ship side outer plate of the oil tanker is damaged, in order to prevent the crude oil accumulated in the oil tanker from flowing out to the ship, it is obliged to install a double hull structure.

Fig. 1 is a longitudinal cross-sectional view schematically showing a structure of a tanker having a double hull structure. That is, Fig. 1 is a cross-sectional view in which the oil tanker is cut in a direction perpendicular to the front-rear direction (longitudinal direction) of the oil tanker. As shown in Fig. 1, the bottom of the tanker 1 is composed of a bottom outer panel 10 and a bottom inner panel 11, and the side of the ship is composed of a ship side outer panel 12 and a ship side inner panel 13. Therefore, the tanker 1 has a double hull structure, and is formed of an outer panel composed of the bottom outer panel 10 and the ship side outer panel 12, and is formed of an inner panel composed of the bottom inner panel 11 and the side inner panel 13.

An upper deck 14 is provided at the upper end of the ship side outer panel 12 and the ship side inner panel 13. A space formed between the bottom outer panel 10 and the bottom inner panel 11 and between the side outer panel 12 and the side inner panel 13 is provided with a ballast tank 20. On the other hand, in the space enclosed by the bottom inner panel 11, the ship side inner panel 13, and the upper deck 14, An oil groove 21 is formed.

In the oil groove 21 of the oil tanker 1, for example, two longitudinal bulkheads 30 extending in the front-rear direction of the oil tanker 1 are provided. The oil sump 21 is divided into a center compartment 31 and two wing compartments 32 by the longitudinal bulkheads 30. Further, the oil groove 21 is provided with a partition cross member 41 that protrudes from the inner surface of the vertical bulkhead 30 and the inner surface of the ship side inner panel 13 in a direction perpendicular to the front and rear directions of the oil tanker 1 (see FIG. 2).

Further, on the surface of the ship bottom inner panel 11 and the ship side inner panel 13 on the ballast tank 20 side, a flat plate-shaped plurality of flexible material 40 extending in the front-rear direction of the oil tank 1 is provided at predetermined intervals. Further, the longitudinal bulkhead 30 is provided with a plurality of flexible members 40 in the same manner as the ship-side inner panel 13 even on the surface of the center compartment 31 side. These defensive members 40 are used as a reinforcing material for improving the rigidity of the ship bottom inner panel 11 and the ship side inner panel 13.

In the oil tanker 1 having the double hull structure thus constituted, seawater is accumulated in the ballast tank 20 formed between the bottom outer panel 10 and the bottom inner panel 11 and between the ship side outer panel 12 and the ship side inner panel 13. Further, crude oil is accumulated in the oil groove 21 formed by the ship bottom inner panel 11 and the ship side inner panel 13. Therefore, the steel plates of the structural bottom inner panel 11 and the ship side inner panel 13 are exposed to a corrosive environment composed of seawater and crude oil.

Therefore, it is generally known that local corrosion of a corrosion rate of a few mm/year is generated in the ship bottom inner panel 11 and the ship side inner panel 13. As a countermeasure against the corrosion, in general, the ship bottom inner panel 11 and the ship side inner panel 13 are subjected to anti-corrosion coating. Further, in order to reduce the frequency of maintenance such as recoating, the ship bottom inner panel 11 and the ship side inner panel 13 are formed by using a special steel sheet having high corrosion resistance (for example, Patent Documents 1 to 4).

[Practical Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2001-214236

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2004-204344

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2005-23421

[Patent Document 4] Japanese Patent Laid-Open Publication No. 2007-270196

Summary of invention

However, as shown in FIG. 1, on the surface of the longitudinal bulkhead 30 provided in the oil groove 21, a plurality of flexible members 40 on a flat plate extending in the front-rear direction of the oil tanker 1 are provided. Fig. 2 is a side cross-sectional view schematically showing the structure provided in the vicinity of the flexible material 40 of the vertical bulkhead 30. In FIG. 2, although only four resist members 40 arranged in the vertical direction and parallel to each other are shown, in general, on the longitudinal bulkhead 30, the flexible members 40 are arranged in the vertical direction and are parallel to each other. Way of configuration.

As can be seen from Fig. 2, the flexible material 40 extends from the surface of the longitudinal bulkhead 30 in a nearly horizontal direction. Therefore, even when the crude oil or the like stored in the oil tank 21 is discharged to the outside, there is a crude oil or sludge on the flexible material 40, particularly in the vicinity of the joint portion between the flexible material 40 and the longitudinal bulkhead 30. Residual situation. Here, in order to suppress the residual of such a crude oil or the like, it is considered that the discharge preventing hole 40 is provided in the flexible material 40, and the flexible material 40 is slightly inclined toward the discharge hole 42a. When the crude oil or the like stored in the oil tank 21 is discharged to the outside, the crude oil or the like on the weatherproof material 40 flows toward the discharge hole 42a along the inclination of the flexible material 40, and Since the discharge hole 42a flows down, it is possible to suppress the residual oil or the like from remaining on the flexible material 40.

Further, when the discharge hole 42a is provided in the flexible material 40, as shown in FIG. 2, it is conceivable to arrange the discharge holes 42a on the same lead straight line for the plurality of the flexible members 40 arranged in the vertical direction and arranged in a flat manner. Thereby, the crude oil or the like which has flowed down from the discharge hole 42a of the upper flexible material 40 will flow down to the lower side without colliding with the other flexible material 40. Therefore, it is possible to more reliably suppress the residual of the crude oil or the like on each of the flexible materials 40.

However, the inventors of the present invention have eagerly directed the occurrence of local corrosion by using the oil-coated oil tank shown in FIG. 2 for the coated steel sheet to which the anti-corrosion coating is applied and the special steel sheet (corrosion-resistant steel sheet) having high corrosion resistance. survey. As a result, it was found that the local corrosion was concentrated on the surface on the oil groove side of the inner bottom plate of the ship, that is, the inside of the oil groove was divided into the vicinity of the longitudinal bulkheads of the plurality of partitions.

The present invention has been made in view of the above problems, and an object thereof is to provide an oil groove capable of suppressing corrosion locally generated in an oil groove of a tanker.

The inventors of the present invention conducted further investigations on the surface of the oil groove side concentrated on the inner bottom plate of the ship, that is, the local corrosion in the vicinity of the longitudinal bulkhead in which the oil groove is divided into a plurality of partitions. As a result, it was found that the local corrosion occurred almost exactly at the position immediately below the discharge hole formed on the viscous material provided as the reinforcing material of the longitudinal bulkhead, and was located outside the position immediately below the discharge hole. Almost no localized corrosion occurred.

Next, the inventors have found that the direct collision of the crude oil flowing down from the discharge hole against the inner bottom plate of the ship is the cause of local corrosion in the oil groove. Enter In one step, the inventors of the present invention provided an anti-collision structure in the oil tank, and successfully suppressed corrosion in the oil groove of the oil tank, that is, local corrosion caused by the crude oil flowing down from the discharge hole.

The present invention has been completed based on the above knowledge, and the gist thereof is as follows.

(1) An oil groove of a tanker formed by a bottom plate and a side plate and partitioned into a plurality of grooves by a partition wall; wherein the inner surface of the side plate and at least one surface of the partition wall have a plurality of types of protection The flexible material is arranged in the vertical direction and spaced apart from each other in the horizontal direction, and the flexible material is provided with a flat plate portion and a discharge hole formed through the flat plate portion, and is disposed from the upper portion in the vertical direction. When viewed from above, the discharge holes provided in the respective flexible materials overlap with other members.

(2) The oil groove of the oil tanker according to (1), wherein the other member is a fluid collision member, and is disposed below a discharge hole of the flexible material.

(3) The oil groove of the oil tanker according to (2), wherein the discharge holes provided on the viscous material arranged side by side in the vertical direction are arranged in a row in the vertical direction, and the fluid collision member is disposed in a plan view. It will overlap with the discharge holes arranged in a row in the vertical direction.

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

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

(6) The oil groove of the oil tanker according to any one of (2) to (5), wherein the fluid collision member is disposed at a lowermost position than a viscous material arranged side by side in the vertical direction. In the lower position.

(7) The oil groove of the oil tanker according to any one of (2) to (5), wherein the fluid collision member has the same outer shape as the aforementioned flexible material disposed adjacent to the fluid collision member.

(8) The oil groove of the oil tanker according to (1), wherein the other member is a other flexible material, and the flexible material is disposed such that, when viewed from the upper side in the vertical direction, the discharge holes provided in the respective flexible materials are The flat portions of the other flexible materials are overlapped.

(9) The oil groove of the oil tanker according to (8), wherein the plurality of the defensive members arranged in the vertical direction are arranged in the vertical direction except for the plurality of the defensive materials other than the other defensive materials. The flat plate portions of the other flexible material are arranged so as to overlap the discharge holes arranged in a row in the vertical direction in a plan view from the upper portion in the vertical direction.

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

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

(12) The oil groove of the oil tanker according to any one of (8), wherein the remaining one of the plurality of flexible materials is disposed at a lowermost portion of the plurality of the flexible materials arranged in the vertical direction. Protective material.

(13) The oil groove of the oil tanker according to (8), wherein the plurality of eccentric materials arranged in the vertical direction are arranged to be spaced apart from each other in the vertical direction, and are disposed at a position at a distance of 15 m or less from the bottom plate in the vertical direction. At least one of the flexible materials is disposed in such a manner that the discharge holes of the flexible material disposed adjacent to each other in the vertical direction do not overlap each other in plan view.

(14) The oil groove of the oil tanker according to (8), wherein the plurality of eccentric materials arranged in the vertical direction are arranged to be spaced apart from each other in the vertical direction, and are disposed at a position at a distance of 2 m or less from the bottom plate in the vertical direction. At least one of the flexible materials is disposed in such a manner that the discharge holes of the flexible material disposed adjacent to each other in the vertical direction do not overlap each other in plan view.

According to the present invention, corrosion locally generated in the oil groove of the oil tank can be suppressed.

1‧‧‧tanker

10‧‧‧Bottom outer plating

11‧‧‧Bottom plate

12‧‧‧ ship side outer panel

13‧‧‧Ship side inner panel

14‧‧‧Upper deck

20‧‧‧ ballast tank

21‧‧‧ oil tank

30‧‧‧ vertical bulkhead

31‧‧‧Centre

32‧‧‧wing compartment

40‧‧‧Flaws

41‧‧‧ partition wall

42a‧‧‧Exhaust hole

42b‧‧‧ Flat section

43, 43a, 44, 45, 46, 50‧‧‧ fluid impact members

61‧‧‧犠物物

F‧‧‧ flowing

IV-IV‧‧‧ section

Fig. 1 is a longitudinal sectional view showing a schematic structure of a tanker having a double hull structure.

Fig. 2 is a side cross-sectional view schematically showing a structure provided in the vicinity of a longitudinal member of a longitudinal bulkhead.

Fig. 3 is a side cross-sectional view schematically showing a structure in the vicinity of a tamper resistant material according to a first embodiment of the present invention.

Fig. 4 is a cross-sectional plan view taken along line IV-IV of Fig. 3, and schematically shows a structure in the vicinity of the tamper-evident material.

Fig. 5 is a side cross-sectional view schematically showing a structure in the vicinity of a tamper resistant material according to a first modification of the first embodiment.

Fig. 6 is a graph showing the relationship between the height of the discharge holes continuously existing from the bottom of the ship and the probability of occurrence of local corrosion.

Fig. 7 is a side cross-sectional view schematically showing a configuration in the vicinity of a tamper resistant material according to a second modification of the first embodiment.

Fig. 8 is a side cross-sectional view schematically showing a configuration in the vicinity of a tamper resistant material according to a third modification of the first embodiment.

Fig. 9 is a side cross-sectional view schematically showing a structure in the vicinity of a tamper resistant material according to a second embodiment of the present invention.

Fig. 10 is a side cross-sectional view schematically showing a configuration in the vicinity of a tamper resistant material according to a modification of the second embodiment.

Fig. 11 is a side cross-sectional view schematically showing a structure in the vicinity of a tamper resistant material according to a third embodiment of the present invention.

Form for implementing the invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Further, the oil tanker 1 having the oil groove of the present invention basically has the same structure as the oil tanker shown in Fig. 1.

That is, the tanker 1 has a double hull structure, and the double hull structure has an outer panel having a bottom outer panel 10 and a ship side outer panel 12; the inner panel has a bottom inner panel 11 and a ship side inner panel 13 By. An upper deck 14 is attached to the upper ends of the ship side outer panel 12 and the ship side inner panel 13. A ballast tank 20 is formed between the outer panel (the bottom outer panel 10 and the side outer panel 12) and the inner panel (the bottom inner panel 11 and the side inner panel 13). Further, an oil groove 21 is formed in a space surrounded by the ship bottom inner panel 11, the ship side inner panel 13, and the upper deck 14. Furthermore, in Figure 1 In the illustrated example, the tanker 1 has a double hull structure. However, the oil tanker 1 may have another structure such as a three-layer hull structure as long as it has the bottom plate and the side plates forming the oil groove 21.

Even in the oil groove 21 of the present invention, similarly to the oil groove shown in Fig. 1, a longitudinal bulkhead wall 30 extending in the front-rear direction of the oil tanker 1 is provided. The oil sump 21 is divided by the longitudinal bulkhead 30 into a center compartment 31 and a wing bay 32.

Further, in the oil groove 21 of the present invention, similarly to the oil groove shown in Fig. 1, a plurality of flat plates are provided on the surface of the ship bottom inner panel 11 and the ship side inner panel 13 on the ballast tank 20 side. The flexible material 40 serves as a reinforcing material for improving the rigidity of the ship bottom inner panel 11 and the ship side inner panel 13. The defensive member 40 extends horizontally in the front and rear direction of the tanker 1 (further, in reality, the defensive member 40 may not be completely level due to manufacturing errors, and thus, in reality, it also includes Fully horizontal extension of ±10° or ±5° range). The defensive members 40 provided on the bottom plate 11 of the ship extend almost vertically in the front and rear directions of the tanker 1, and are disposed at predetermined intervals in the lateral direction (the direction perpendicular to the front and rear directions of the tanker 1). The defensive members 40 provided on the ship side inner panel 13 extend almost vertically in the front and rear directions of the oil tanker 1, and are disposed at predetermined intervals in the up and down direction. Further, even on the surface of the longitudinal bulkhead 30 on the side of the center compartment 31, for example, a plurality of flexible members 40 are provided in the same manner as the ship-side inner panel 13.

Further, in the example shown in Fig. 1, the flexible material 40 is provided on the surface of the ship bottom inner panel 11 and the ship side inner panel 13 on the side of the ballast tank 20, and the surface of the longitudinal bulkhead 30 on the center compartment 31 side. on. However, the position of the defensive material 40 is set and The position on the side of the oil groove 21 of the ship bottom inner panel 11 and the ship side inner panel 13 or the surface of the longitudinal bulkhead 30 on the wing deck 32 side may be provided, for example, on the bottom side of the ship bottom inner panel 11 and the ship side inner panel 13.

FIG. 3 is a side cross-sectional view schematically showing a structure provided in the vicinity of the flexible material 40 of the vertical bulkhead 30. As shown in Fig. 3, the longitudinal bulkhead 30 is provided with a plurality of partition beams 41 which extend almost vertically in a direction perpendicular to the front and rear directions of the oil tank 1. Each of the flexible materials 40 includes a flat plate portion 42b and a discharge hole 42a formed to penetrate the flat plate portion 42b. The flat plate portion 42b of each of the flexible sheets 40 is slightly inclined toward the discharge hole 42a. Further, the tamper-evident material 40 which is arranged in parallel in the vertical direction and arranged in parallel is provided with the discharge holes 42a on the same lead line. In other words, the discharge holes 42a provided in the plurality of the flexible materials 40 arranged in parallel in the vertical direction are arranged in a line in the vertical direction, that is, when viewed from the upper portion in the vertical direction, The positions of the discharge holes 42a are set to be the same.

Further, in the oil groove 21 according to the first embodiment of the present invention, as shown in FIG. 3, the plurality of the flexible materials 40 arranged in the vertical direction are disposed in the discharge holes of the flexible material 40 disposed at the lowermost portion. A flat fluid collision member 43 is provided at a position directly below the 42a. In the present embodiment, the fluid collision member 43 is joined to the longitudinal bulkhead 30 by welding. The fluid collision member 43 is formed to have a larger outer diameter than the discharge hole 42a as shown in FIG. Therefore, the fluid collision member 43 is disposed such that the entire discharge hole 42a overlaps the fluid collision member 43 in a plan view, that is, the discharge hole 42a as a whole is disposed inside the fluid collision member 43 in plan view.

When the oil sump 21 of the present embodiment configured as described above is discharged from the oil sump 21, for example, the crude oil or the like flowing down from the discharge hole 42a is as shown by the arrow in Fig. 3, and the collision of the fluid collision member 43 is caused by the fluid collision. The member 43 is dispersed. The dispersed crude oil or the like flows down from the side of the fluid collision member 43, and then reaches the bottom plating plate 11. Therefore, the crude oil or the like flows down a long distance from the discharge hole 42a of the upper flexible material 40, whereby even if the crude oil or the like has high kinetic energy (or speed), the crude oil or the like can directly collide with the ship bottom inner panel 11 without being directly collided. Colliding with the fluid collision member 43. Therefore, the high kinetic energy will be absorbed by the fluid collision member 43, and when the crude oil or the like reaches the bottom plate 11, the kinetic energy will become quite low. As a result, local corrosion of the ship bottom inner panel 11 caused by the crude oil or the like flowing down from the discharge hole 42a can be suppressed.

Further, in the present embodiment, the fluid collision member 43 is formed at an end portion on the side opposite to the side of the vertical bulkhead 30, and is closer to the side of the vertical bulkhead 30 than the end portion of the flexible material 40 in plan view. position. By forming in this manner, it is possible to suppress the fluid collision member 43 from interfering with the flow of the crude oil in the oil groove 21 when the oil tank 21 is loaded and unloaded with the crude oil. Further, any of the members constituting the oil tanker 1 is a steel plate for ships such as a coated steel plate or a corrosion-resistant steel plate.

Further, the fluid collision member 43 is used to prevent the crude oil or the like flowing down from the discharge hole 42a from directly colliding with the upper surface of the ship bottom inner panel 11, and is also considered to be, for example, directly below the discharge hole 42a shown by a broken line in Fig. 3. In position, the fluid collision member 43a is directly coupled to the bottom plating 11 of the ship as a material. However, the status quo is subject to the rules of the class and is obliged to periodically confirm the bottom of the ship. Whether or not the thickness reduction of the inner panel 11 is limited to a predetermined value range, the fluid collision member 43a as a sturdy material may become an obstacle in the measurement of the sheet thickness. Therefore, under the current classification of the ship's class, although the implementation is limited, it is within the technical scope of the present invention to attach the fluid collision member 43a as a shovel directly to the bottom plate 11 of the ship.

In addition, in consideration of the fact that the inventors of the case where the local corrosion is hardly found, except for the position immediately below the discharge hole 42a, the result of the investigation from the side opposite to the vertical bulkhead 30 side of the flexible material 40 is considered. The flow F (see Fig. 2) of the crude oil or the like flowing down at the end can be said to be free from local corrosion. Therefore, in the above-described embodiment, each of the flexible material 40 is inclined toward the discharge hole 42a, but the entire flexible material 40 may not be inclined toward the discharge hole 42a. For example, the flexible material 40 may be inclined toward the end portion on the side opposite to the side of the vertical bulkhead 30 in the vicinity of the end portion of the flexible material 40 opposite to the side of the inner longitudinal bulkhead 30.

Next, a first modification of the first embodiment of the present invention will be described with reference to Figs. 5 and 6 . In the above-described first embodiment, the fluid collision member 43 is disposed in the plurality of the deflection preventing members 40 arranged in the vertical direction, and is disposed below the discharge hole 42a of the lowermost flexible material 40. On the other hand, as is clear from FIG. 5, in the present modification, the fluid collision member 44 is disposed between the distalmost protective material 40 and the second flexible material 40 from below. Further, the fluid collision member 44 is disposed so as to be the entire discharge hole 42a of the second flexible material 40 (that is, the flexible material 40 disposed directly above the fluid collision member 44) from the bottom. The medium overlaps with the fluid collision member 44. In other words, the fluid collision member 44 is configured The discharge hole 42a of the second flexible material 40 is entirely located inside the fluid collision member 44 in plan view.

In the example shown in FIG. 5, the fluid collision member 44 is disposed directly below the second flexible material 40 from the bottom, but may be disposed in the third and the third from the bottom. The four flexible materials 40 and the like are directly below the other flexible material 40. However, the fluid collision member 44 is disposed at a distance of 15 m or less from the vertical direction of the ship bottom inner panel 11, and is preferably 8 m or less, and more preferably 2 m or less.

Fig. 6 is a view showing the relationship between the height of the discharge holes which are continuous on the same lead line from the bottom plate and the probability of occurrence of local corrosion. In other words, Fig. 6 shows the relationship between the height of the uppermost compliant material 40 and the probability of occurrence of local corrosion in the viscous material 40 which is continuous from the bottom plate and whose discharge holes are on the same straight line. As can be seen from the figure, when the height of the discharge hole continuously existing from the bottom plate is higher than 15 m, the probability of occurrence of local corrosion is 100%. On the other hand, when the height of the discharge hole continuously existing from the bottom plate becomes 15 m or less, the generation rate of local corrosion will fall.

As can be seen from Fig. 6, in the case where the height of the discharge hole continuously existing from the bottom plate is about 10 m, the probability of occurrence of local corrosion is about 80%, and about 50% for about 8 m and 40% for about 7 m. It is 25% for about 5m, 20% for about 4m, and 10% for about 3m. Then, if the height of the discharge hole is 2 m or less, the probability of occurrence of local corrosion is 0%. Therefore, if the position at which the fluid collision member 44 is disposed is set to a position at a distance of 15 m or less from the vertical direction of the ship bottom inner panel 11, the local corrosion can be reduced as compared with the case where the fluid collision member 44 is not provided. Generate probability. If it will match The position of the fluid-collecting member 44 is set to a position at a distance of 8 m or less from the vertical direction of the ship bottom inner panel 11, and the probability of occurrence of local corrosion can be reduced as compared with the case where the fluid collision member 44 is not provided. Less than half. When the position at which the fluid collision member 44 is disposed is set to a position at a distance of 2 m or less from the vertical direction of the ship bottom inner panel 11, the probability of occurrence of local corrosion is made close to 0%.

By setting the position at which the fluid collision member 44 is disposed in this manner to be higher than that of the first embodiment, the kinetic energy (speed) of the crude oil or the like that collides with the fluid collision member 44 can be lowered. Thereby, local corrosion on the fluid collision member 44 can be suppressed.

Next, a second modification of the first embodiment of the present invention will be described with reference to Fig. 7 . In the above embodiment, only one fluid collision member is disposed in the plurality of discharge holes 42a arranged in a line. On the other hand, in the present modification, in addition to the fluid collision member 43 disposed below the lowermost deflection preventing material 40, the third flexible material 40 is counted from below and the second from the bottom. A fluid collision member 45 is also disposed between the deflection preventing members 40.

As described above, when a plurality of fluid collision members 43 and 45 are provided in a plurality of discharge holes 42a arranged in a line, the kinetic energy (speed) of the crude oil or the like that collides with each of the fluid collision members 43 and 45 can be lowered. Further, the fluid collision member 43 disposed at the lowest position among the plurality of fluid collision members 43 and 45 is disposed below, and the kinetic energy (speed) of the crude oil or the like that collides with the ship bottom inner panel 11 can be lowered. Thereby, the local corrosion of any of the fluid collision members 43 and 45 and the bottom plating plate 11 can be reduced.

Next, a third modification of the first embodiment of the present invention will be described with reference to Fig. 8 . In the above embodiment, the plate-shaped fluid collision member 43 is used to form the collision prevention structure. However, the shape of the fluid collision member 43 is not limited to the flat shape. The fluid collision member may have any shape as long as it overlaps with the fluid collision member 43 in plan view. In the present modification, for example, a pyramid-shaped fluid collision member 46 as shown in Fig. 8 is used.

Next, a second embodiment of the present invention will be described with reference to Fig. 9 . The structure of the oil groove of the second embodiment is basically the same as that of the oil groove of the first embodiment. Here, in the first embodiment described above, the flexible material 40 is configured such that the discharge holes 42a are provided on the same lead line. The above-described structure is provided so as to reliably suppress the presence of crude oil or the like on each of the respective flexible materials 40 as described above, and to form the plurality of the flexible members 40 having the same shape and to straddle the flexible material 40 thereof. The upper and lower longitudinal bulkheads 30 are welded together to suppress construction costs. Therefore, the flexible material 40 is not necessarily required to have the discharge holes 42a provided on the same lead line.

Here, in the second embodiment, as shown in FIG. 9, for example, the discharge holes 42a of the distalmost protective material 40a disposed in the plurality of the flexible materials 40 arranged in parallel in the vertical direction are provided in a plan view. The middle is not disposed so as to overlap the discharge holes 42a of the flexible material 40 located above it. In other words, the discharge hole 42a provided in the lowermost flexible material 40a is disposed so as to overlap the flat plate portion 42b of the flexible material 40 located above it in plan view. In particular, in the present embodiment, the flexible material 40 other than the lowermost flexible material 40a is provided with the discharge hole 42a in the lead. Configure them in a straight line in a row. Therefore, only the position where the discharge hole 42a is disposed in the lowermost flexible material 40a is different from the other flexible material 40. Further, in the second embodiment, the fluid collision member of the first embodiment is not provided.

In the oil groove 21 of the second embodiment configured as described above, the crude oil or the like that has flowed into the discharge hole 42a of the lowermost flexible material 40a flows down from the discharge hole 42a disposed above the higher-prevention material 40. The kinetic energy (speed) is lowered when it collides with the upper surface of the flexible material 40a. Therefore, the kinetic energy (downflow speed) of the crude oil or the like flowing down from the discharge hole 42a of the lowermost flexible material 40a can be lowered. Therefore, the defensive members 40 and 40a are disposed as shown in FIG. 9, whereby the same effect as in the case where the fluid collision member 43 is provided can be obtained without providing the fluid collision member 43.

Moreover, if the flexible material 40, 40a is arrange|positioned, as shown in FIG. 9, the fluid collision member 43 is not required. Therefore, the welding work and the accompanying work at a high place are no longer required, and the work cost and safety at the construction 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 discharge hole 42a of the flexible material 40a disposed at the lowermost portion is different from the position of the discharge hole 42a of the other flexible material 40. However, the flexible material that changes the position of the discharge hole 42a is not necessarily the lowermost flexible material 40a, but may be the second flexible material from the bottom or the third one from the bottom. Other materials such as materials. In addition, the position of the discharge hole 42a can be changed for a plurality of the flexible material only by changing the position of the discharge hole 42a only to one of the control materials arranged in the vertical direction.

However, the distance between the deflection preventing material and the position of the discharge hole 42a in the vertical direction is 15 m or less, preferably 8 m or less, and preferably 2 m or less. In other words, the distance between the yokes 40 which are arranged in parallel in the vertical direction and which are disposed in parallel in the vertical direction is 15 m or less, preferably 8 m or less, preferably 2 m or less. At least one of the defensive members at the position is disposed so as not to overlap the discharge holes 42a of the defensive members 40 disposed adjacent to each other in the vertical direction in plan view. By positioning the position of the flexible material 40 at the position of the discharge hole 42a in this manner close to the bottom inner panel 11, as will be explained using FIG. 6, the probability of occurrence of local corrosion can be reduced.

Further, as shown in FIG. 9, when a portion of the squeezing member 40a is changed to the position of the discharge hole 42a, the crude oil or the like which flows down from the discharge hole 42a of the viscous material 40 provided above will collide with it. The upper surface of the flexible material 40a. In this case, there is a possibility that local corrosion occurs in the flexible material 40 of the structural member, and it is necessary to replace the flexible material 40 when corrosion occurs. Therefore, as shown in FIG. 10, for example, the sacrificial material 61 may be provided on the upper surface of the flexible material 40 and directly below the discharge hole 42a of the upper flexible material 40 to prevent corrosion of the flexible material 40. .

Next, a third embodiment of the present invention will be described with reference to Fig. 11 . The structure of the oil groove of the third embodiment is basically the same as that of the oil groove of the first embodiment. However, in the oil groove of the third embodiment, the member 50 is provided as a fluid collision member, and the member 50 basically has the same shape and outer shape as the protection member 40, and is not provided with a discharge hole.

As can be seen from Fig. 11, in the oil groove of the present embodiment, it is located A fluid collision member 50 is provided below the lowermost flexible material 40. The fluid collision member 50 has the same outer shape as the flexible material 40 and is not provided with a discharge hole. If the viewpoint is changed, it can be said that the fluid collision member 50 is provided at a position corresponding to the discharge hole 42a of the flexible material 40, and a closing member that closes the discharge hole 42a is provided. Even when the fluid impact member is used, the same effect as the fluid collision member 43 of the first embodiment described above can be obtained.

Further, as the fluid collision member 50, the defensive member 40 before the boring process for forming the discharge hole 42a can be used. Therefore, it is no longer necessary to separately produce a die-casting mold or the like for the fluid collision member 50, and as a result, the manufacturing cost can be reduced.

Further, in the example shown in FIG. 11, the fluid collision member 50 is disposed below the distal end of the flexible material 40 disposed at the lowermost position, but may be disposed at the second and third degrees of deflection from the bottom. The material 40 and the like are directly below the other flexible material 40. However, even in such a case, the fluid collision member 50 is disposed at a distance of 15 m or less from the vertical direction of the ship bottom inner panel 11, and is preferably 8 m or less, and more preferably 2 m or less.

Moreover, in the example shown in FIG. 11, the flexible material 40 arrange|positioned by the perpendicular direction in the perpendicular direction is formed in the same outer shape. However, the flexible material 40 does not have to have the same outer shape, and for example, the width of each of the flexible materials 40 (the length in the direction perpendicular to the front-rear direction) may be different. In this case, the fluid collision member 50 has the same outer shape as at least any of the plurality of the flexible materials 40 arranged side by side in the vertical direction. For example, the fluid collision member 50 has the same outer shape as the flexible material 40 disposed adjacent to the fluid collision member 50.

In addition, in the first embodiment, the second embodiment, and the third embodiment, it is understood that the flexible material includes the discharge formed so as to penetrate the flat plate portion and the flat plate portion. The holes are arranged such that, when viewed from the upper side in the vertical direction, the discharge holes provided in the respective flexible materials overlap with other members.

The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited by the examples. It is to be understood that, as long as it is a practitioner, it is obvious that various modifications and corrections are available within the scope of the idea described in the patent application, and it is of course within the technical scope of the present invention.

Industrial utilization possibility

The present invention is directed to the suppression of corrosion of oil grooves of oil tankers that transport crude oil or other liquids.

11‧‧‧Bottom plate

30‧‧‧ vertical bulkhead

40‧‧‧Flaws

41‧‧‧ partition wall

42a‧‧‧Exhaust hole

42b‧‧‧ Flat section

43, 43a‧‧‧fluid collision components

IV-IV‧‧‧ section

Claims (14)

An oil groove of a tanker is formed by a bottom plate and a side plate, and is partitioned into a plurality of grooves by a partition wall, and is characterized in that: a plurality of flexible materials are provided on at least one side of the inner surface of the side plate and the surface of the partition wall And the other members are disposed on at least one of the inner surface of the side plate and the surface of the partition wall; the anti-fracture materials are respectively disposed at intervals of each other and arranged in the vertical direction and extending in the horizontal direction; When the flat plate portion and the discharge hole formed to penetrate the flat plate portion are provided and arranged in a plan view from the upper portion in the vertical direction, the discharge holes provided in the respective flexible members overlap with the other members. The oil tank of the oil tanker according to claim 1, wherein the other member is a fluid collision member, and is disposed below a discharge hole of the flexible material and is collided by a fluid flowing from the discharge hole. The oil groove of the oil tanker according to the second aspect of the patent application, wherein the discharge holes provided on the anti-scratch material arranged side by side in the vertical direction are arranged in a row in the vertical direction, and the fluid collision member is disposed in a plan view. It overlaps with the discharge holes arranged in a row in the vertical direction. The oil groove of the oil tanker according to claim 2 or 3, wherein the fluid collision member is disposed at a position in the vertical direction from the bottom plate at a position of 15 m or less. The oil groove of the oil tanker according to claim 2 or 3, wherein the fluid collision member is disposed at a distance from the bottom plate in a vertical direction Below 2m. The oil groove of the oil tanker according to the second or third aspect of the invention, wherein the fluid collision member is disposed at a position lower than a lowermost one of the fluid-impregnated members arranged side by side in the vertical direction. The oil groove of the oil tanker according to claim 2 or 3, wherein the fluid collision member has the same outer shape as the aforementioned flexible material disposed adjacent to the fluid collision member. An oil groove of a tanker is formed by a bottom plate and a side plate, and is partitioned into a plurality of grooves by a partition wall, and is characterized in that: a plurality of flexible materials are provided on at least one side of the inner surface of the side plate and the surface of the partition wall And a plurality of other flexible materials different from the plurality of the plurality of the flexible materials are disposed on the inner surface of the side plate and the surface of the partition wall, which are arranged in the vertical direction and spaced apart from each other in the horizontal direction; Each of the plurality of flexible materials is provided with a flat plate portion and a discharge hole formed to penetrate the flat plate portion, and the plurality of the plurality of flexible materials are disposed in a vertical direction from the upper portion, and are provided in each of the plurality of flexible materials The discharge hole overlaps with the flat plate portion of the other flexible material mentioned above. The oil groove of the oil tanker according to the eighth aspect of the invention, wherein the plurality of the flexible material discharge holes arranged in the vertical direction are arranged in a row in the vertical direction; the flat portion of the other flexible material is The discharge holes are arranged in a row in the vertical direction in a plan view from the upper portion in the vertical direction. Such as the oil tank of the tanker of claim 8 or 9 of which the aforementioned other The flexible material is disposed at a position where the distance from the bottom plate in the vertical direction is 15 m or less. The oil groove of the oil tanker according to the eighth or ninth aspect of the invention, wherein the other flexible material is disposed at a position of 2 m or less from the bottom plate in the vertical direction. The oil tank of the oil tanker according to claim 8 or 9, wherein the other flexible material is disposed below the plurality of the flexible materials. The oil groove of the oil tanker according to the eighth aspect of the patent application, wherein the plurality of eccentric materials arranged in the vertical direction are arranged to be spaced apart from each other by a distance of 15 m or less from the bottom plate in the vertical direction. At least one of the flexible materials is disposed in such a manner that the discharge holes of the flexible material disposed adjacent to each other in the vertical direction do not overlap each other in plan view. The oil groove of the oil tanker according to the eighth aspect of the patent application, wherein the plurality of eccentric materials arranged in the vertical direction are arranged to be spaced apart from each other by a distance of 2 m or less from the bottom plate in the vertical direction. At least one of the flexible materials is disposed in such a manner that the discharge holes of the flexible material disposed adjacent to each other in the vertical direction do not overlap each other in plan view.