KR20220106201A - fuel tanks, and ships - Google Patents

Abstract

A fuel tank mounted on a ship includes a storage portion in which fuel is stored, a piping portion extending downward from the bottom portion of the storage portion and through which fuel flows, and a piping portion first in a direction in which the piping portion extends from the bottom portion of the storage portion. A valve formed therein is provided, and a barrier portion covering at least the valve from the bottom of the storage portion in an airtight manner is provided, and the barrier portion is lower than the storage portion and is provided in a barrier portion installation portion that is a part of a ship.

Description

fuel tanks, and ships

The present disclosure relates to a fuel tank and a ship on which the fuel tank is mounted.

The storage part for storing liquefied gas, such as liquefied natural gas (LNG) and liquefied propane gas (LPG), may be formed in the fuel tank mounted on a ship. A pipe for injecting liquefied gas into the storage unit or discharging the liquefied gas from the inside of the storage unit is connected to the storage unit. Patent Document 1 discloses a ship provided with a storage unit for storing liquefied gas, and a pipe through which the liquefied gas stored in the storage unit flows toward a main body.

When mounting a fuel tank on a ship, a storage part is mounted on a saddle in consideration of the thermal contraction by low-temperature liquefied gas in many cases. Moreover, in the extension direction of piping, it is necessary to form the barrier which airtightly covers up to the valve (1st valve) formed in the position closest to a storage part on piping. A space called a tank connection space (TCS) is formed in this barrier. Even if liquefied gas leaks from the connection part of a fuel tank and a 1st valve, it is stored in TCS.

Japanese Laid-Open Patent Publication No. 2018-176900

The pipe may extend downward from the bottom of the storage unit. Thereby, it becomes possible to utilize the gravity of liquefied gas at the time of discharge|emission of liquefied gas, and it is known that the number of installations of a pump can be reduced. In this case, in order to hermetically cover up to the first valve with the barrier as described above, the barrier also extends from the bottom of the storage unit, ie, has a suspended structure. The barrier needs to ensure confidentiality. In addition, the barrier is also required to have a structure that prevents significant deformation even when storing the low-temperature/high-pressure liquefied gas leaked from the storage unit. To this end, it is necessary to increase the thickness of the barrier and firmly combine the barriers with each other. In addition, a space for forming the TCS is required below the storage unit, so that the storage unit is placed from the bottom surface where the saddle is fixed, etc. increase in height to As the capacity of the storage unit increases, it is also necessary to increase the capacity of the TCS. Acceleration received by the storage unit or the like accompanying the hull sway becomes larger as the height is higher. Therefore, in order to ensure the soundness of a storage part, piping, etc., it is necessary to make the support structure of a storage part more rigid. That is, the response required in the structure similar to patent document 1 leads to cost increase and weight increase of a fuel tank.

The present disclosure has been made in view of the above-described problems, and in a fuel tank mounted on a ship and having a pipe extending from the bottom of the storage unit, more soundness can be ensured by configuring the storage unit at a lower cost and light weight. An object of the present invention is to provide a fuel tank.

In order to achieve the above object, a fuel tank according to the present disclosure is a fuel tank mounted on a ship, and includes a storage unit in which fuel is stored, a piping unit extending downward from the bottom of the storage unit, and through which the fuel is circulated; , a valve formed in the piping portion first in a direction in which the piping portion extends from the bottom portion of the storage portion, and a barrier portion that airtightly covers at least from the bottom portion of the storage portion to at least the valve, wherein the barrier portion , is lower than the storage unit, and is installed in the barrier part installation part that is a part of the ship.

According to the fuel tank of this indication, since a barrier part is below a storage part, and is provided in the barrier part installation part which is a part of a ship, a barrier part can be supported by a barrier part installation part from below. For this reason, compared with the case where a barrier part is not provided in a barrier part installation part but hangs on a storage part, since a barrier part can be comprised cheaply and lightweight, the soundness of a fuel tank can be ensured more.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which showed the structure of the fuel tank which concerns on 1st Embodiment of this indication.
FIG. 2 is a cross-sectional view taken along line AA of FIG. 1 .
3 is a schematic diagram showing a configuration of a fuel tank according to some embodiments of the present disclosure.
4 is a schematic diagram showing the configuration of a fuel tank according to a first modification of the first embodiment of the present disclosure.
5 is a schematic diagram showing the configuration of a fuel tank according to a second modification of the first embodiment of the present disclosure.
FIG. 6 is a diagram showing the configuration of a barrier part according to a third modified example of the first embodiment of the present disclosure, and is an enlarged view of a part of the configuration of the fuel tank for explanation of the barrier part.
7 is a diagram showing the configuration of a barrier part according to a fourth modification of the first embodiment of the present disclosure, and is an enlarged view of a part of the configuration of the fuel tank for explanation of the barrier part.
FIG. 8 is a diagram showing the configuration of a piping part according to a fifth modification example of the first embodiment of the present disclosure, and is an enlarged view of a part of the configuration of the fuel tank for explanation of the piping part.
9 is a view showing the configuration of the bottom of the storage unit according to the sixth modification of the first embodiment of the present disclosure, and is an enlarged view of a part of the configuration of the fuel tank for explanation of the bottom of the storage unit.
Fig. 10 is a diagram showing the configuration of a bottom portion of a storage unit according to another embodiment of the sixth modification.

EMBODIMENT OF THE INVENTION Hereinafter, the fuel tank which concerns on embodiment of this indication, and the ship on which this fuel tank is mounted are demonstrated based on drawing. These embodiments show one aspect of the present disclosure, do not limit the present disclosure, and can be arbitrarily changed within the scope of the technical idea of the present disclosure.

<First embodiment>

With reference to FIG. 1 and FIG. 2, the structure of the fuel tank 1 which concerns on 1st Embodiment of this indication is demonstrated. As shown in FIG. 1 , the fuel tank 1 is mounted on the ship 100 . This fuel tank 1 is equipped with the storage part 2, the piping part 4, the 1st valve 6, and the barrier part 8. As shown in FIG. In this indication, let the direction which goes to a bow from the stern of the ship 100 forward, and let the direction which goes to a stern from the bow of the ship 100 be rearward.

The storage unit 2 has a storage space 3 formed therein, and the fuel F is stored in the storage space 3 (see FIG. 2 ). Such a storage part 2 has a cylindrical shape extended in the front-back direction, and is comprised with single-layer shell structure. The storage unit 2 is mounted on two saddles 10A, 10B arranged in a row along the front-rear direction. Between the reservoir 2 and the two saddles 10A, 10B, an insulating material 14 is arranged. The saddles 10A and 10B are provided on the upper deck 12 (barrier part installation part) of the hull 7 of the ship 100 . Here, the upper deck 12 is the uppermost traditional deck constituting the main part of the hull. The fuel F stored in the storage part 2 is usable for navigation of the ship 100, and the liquefied gas of LNG or LPG is illustrated.

The storage portion 2 is fixed to a rear saddle 10A (fixed saddle) located on the rear side. This fixing means takes, for example, a structure in which a convex portion is formed in the lower portion of the storage portion 2 and sandwiched from the front and rear of the rear saddle 10A, a structure in which both are fixed with bolts, and the like. Moreover, the storage part 2 abuts with the front saddle 10B (abutting saddle) located on the front side. In addition, the saddle which fixes the storage part 2 is not limited to the rear saddle 10A, It may be the front saddle 10B. The stationary saddle considers the influence of the stress generated in the piping portion 4 accompanying the displacement of the storage portion 2 in the front-rear direction accompanying thermal contraction, the storage portion of the piping portion 4 rather than the abutment saddle. (2) is preferably a saddle close to the point extending from below.

The pipe part 4 extends downward from the bottom part 5 (lower wall surface) of the storage part 2 . The piping part 4 is able to connect the storage part 2 (bottom part 5 of the storage part 2), and the fuel adjustment part 20. After the fuel adjustment unit 20 processes the fuel F supplied from the storage unit 2 (fuel tank 1), such as compression, vaporization, and pressure regulation, it is supplied to an engine (not shown).

The 1st valve 6 stores the most in the extension direction D in which the piping part 4 extends from the bottom part 5 of the storage part 2 among one or more valves formed in the piping part 4 . It is close to part (2). The 1st valve 6 can adjust the flow amount of the fuel F which flows through the piping part 4 .

The barrier part 8 is formed in box shape by the barrier, and forms the storage space 9 (tank connection space) in the inside. The barrier part 8 has covered from the bottom part 5 of the storage part 2 to the 1st valve 6 at least so that airtightness is possible. The barrier part 8 is below the storage part 2, and is provided in the upper deck 12 (barrier part installation part) which is a part of ship 100. That is, in 1st Embodiment, the barrier part 8 has covered the 1st valve 6 and the part located above the upper deck 12 among the piping parts 4 so that airtightness is possible. In the first embodiment, a part of the upper deck 12 can also function as a barrier of the barrier portion 8 . Specifically, the upper surface (installation surface) of the upper deck 12 facing the bottom portion 5 of the storage portion 2 at the point where the barrier portion 8 is installed can function as one surface of the box body. . Moreover, this barrier part 8 is comprised from the suitable material according to the temperature of the fuel F stored in the storage part 2 . For example, when the fuel F is LNG, it is composed of, for example, stainless steel, 9% nickel steel, or the like which is particularly excellent in low-temperature toughness. Moreover, when the fuel F is LPG, it is comprised from comparatively low-cost low-temperature steel materials, etc. In addition, as shown in FIG. 3, in some embodiment, the barrier part 8 may be provided in the barrier part installation body 13 (barrier part installation part) which arrange|positioned at least the part in the upper deck 12. none. This barrier part installation body 13 is a stand provided on the upper deck 12, for example. At this time, a part of the barrier part installation body 13 can also be made to function as a barrier of the barrier part 8. As shown in FIG.

According to 1st Embodiment, since the barrier part 8 is below the storage part 2, and is provided in the upper deck 12 or the barrier part installation body 13 of the ship 100, the barrier part 8 It can be supported from below. Moreover, a part of the upper deck 12 and the barrier part installation body 13 can also be used as the barrier part 8. As shown in FIG. For this reason, it becomes possible to provide the fuel tank 1 which can ensure the soundness of the storage part 2 cheaply and lightweight rather than the case where the barrier part 8 hangs on the storage part 2 .

In addition, in 1st Embodiment, although the piping part 4 was piping for discharging the fuel F from the storage part 2, this indication is not limited to this embodiment. The pipe part 4 may be a pipe for injecting the fuel F into the storage part 2 , or may be a pipe configured to allow both injection and discharge of the fuel F into the storage part 2 . . Moreover, although it was said that the two saddles 10A, 10B are provided on the upper deck 12 of the hull 7 of the ship 100 in 1st Embodiment, this indication is not limited to this embodiment. The same holds true even when at least one of the two saddles 10A and 10B is formed on the structure formed on the upper deck 12 . In addition, although the case where there are 2 saddles 10A, 10B was shown in 1st Embodiment, this indication is not limited to this embodiment. According to the front-back direction dimension of the storage part 2, you may form arbitrary raw water. Further, in the first embodiment, the barrier portion 8 is positioned between the rear saddle 10A and the front saddle 10B in the front-rear direction, but the present disclosure is not limited to this embodiment. The barrier portion 8 may be positioned other than between the two saddles 10A, 10B. In addition, in 1st Embodiment, although the barrier part 8 was comprised so that the single piping part 4 might be covered, this indication is not limited to this embodiment. The barrier part 8 may be comprised so that the some piping part 4 may be covered.

(1st modification)

With reference to FIG. 4, the fuel tank 1 which concerns on the 1st modification of 1st Embodiment of this indication is demonstrated. In 1st Embodiment, although the barrier part 8 was provided on the upper deck 12, this indication is not limited to 1st Embodiment. In the first modification, the same elements as those of the first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted.

As shown in FIG. 4, the barrier part 8 is provided on the lower deck 22 (barrier part installation part) of the hull 7 of the ship 100. As shown in FIG. Here, the lower deck 22 is a deck located lower than the upper deck 12 . For convenience, the upper deck 12 and the lower deck 22 are collectively referred to as a deck. That is, a part of the barrier part 8 is inserted in the inside of the ship body 7 . The capacity of the storage unit 2 is preferably made as large as possible, for example, in order to secure the navigation distance of the ship 100 . At this time, the piping diameter of the 1st valve 6 and the piping part 4, etc. will also enlarge. In this case, the volume requested|required of the storage space 9 also becomes large, and it is necessary to form the large-sized barrier part 8. As shown in FIG. Moreover, the volume requested|required of the storage space 9 changes also with the pressure resistance and temperature resistance which the storage part 2 has. In particular, when the storage unit 2 has high pressure resistance, the amount of leakage when the fuel F leaks may increase. Therefore, it is necessary to further increase the volume of the storage space 9 .

If the height (dimension in the vertical direction) of the two saddles 10A, 10B is increased in order to enlarge the storage portion 2 or the barrier portion 8, eventually the storage portion 2 becomes bulky, for example, , the acceleration in the line width direction of the storage unit 2 when the hull 7 is shaken increases. For this reason, conventionally, in addition to the two saddles 10A, 10B, another support member for supporting the storage unit 2 is formed, or the two saddles 10A, 10B are reinforced in some cases. However, according to the configuration of the first modification, even if the storage portion 2 or the barrier portion 8 is enlarged, a part of the barrier portion 8 is inserted into the inside of the hull 7, so the storage portion 2 is Since it is not bulky, it is not necessary to install the support member as described above or to reinforce the two saddles 10A, 10B. In addition, the height of the two saddles 10A, 10B can be made small. For this reason, in this embodiment, even when the storage part 2 is made to have a large capacity, it becomes possible to provide the fuel tank 1 which can ensure the soundness of the storage part 2 at low cost and light weight.

In addition, although it was said that the barrier part 8 is provided on the lower deck 22 in a 1st modification, this indication is not limited to this embodiment. The same holds true even in a case where it is provided on the lower deck 22 and is provided on a non-illustrated barrier part installation body (barrier part installation part). An installation table etc. are illustrated as a barrier part installation body. In addition, a part of the barrier of the barrier part 8 holds similarly, also when using the lower deck 22 or a barrier part installation body.

(Second Modification)

With reference to FIG. 5, the fuel tank 1 which concerns on the 2nd modified example of 1st Embodiment of this indication is demonstrated. Although the second modification further limited the configuration of the barrier portion 8 described in the first modification, the configuration other than that is the same as the configuration described in the first modification. In the second modification, the same elements as those of the first modification are given the same reference numerals, and the detailed description thereof is omitted. In addition, the 2nd modification may further limit the structure of the barrier part 8 demonstrated in 1st Embodiment.

As shown in FIG. 5 , the barrier portion 8 has an area of a cross section perpendicular to the vertical direction (hereinafter referred to as a cross section S) is a connecting portion ( 24) is the smallest. In this embodiment, the barrier part 8 is comprised from the small diameter part 8a and the large diameter part 8b. The small-diameter portion 8a is connected to the bottom portion 5 of the storage portion 2 and maintains the shape of the cross-section S of the small-diameter portion 8a downward from the bottom portion 5 of the storage portion 2 . part that extends to The large-diameter portion 8b is a portion extending downward from the tip of the small-diameter portion 8a while enlarging the area of the cross-section S of the small-diameter portion 8a.

According to the configuration of the second modification, when the bottom portion 5 of the storage portion 2 is displaced due to thermal contraction or hull fluctuation, the stress generated at the connection point between the storage portion 2 and the barrier portion 8 is reduced. can be reduced. Further, the present disclosure is not limited to the second modification as long as the area of the cross section S is the smallest at the connecting portion 24 . For example, the small diameter part 8a may be comprised so that the area of the cross section S becomes large as it goes downward, such as a taper shape.

(3rd modification)

With reference to FIG. 6, the fuel tank 1 which concerns on the 3rd modified example of 1st Embodiment of this indication is demonstrated. Although the 3rd modification further limited the structure of the barrier part 8 demonstrated in the 2nd modification, the structure other than that is the same as the structure demonstrated in the 2nd modification. In addition, the 3rd modification may further limit the structure of the barrier part 8 demonstrated in 1st Embodiment or 1st modification.

As shown in FIG. 6 , the barrier part 8 is divided into two into an upper barrier part 26 and a lower barrier part 28 located below the upper barrier part 26 . In the present embodiment, the small-diameter portion 8a is divided into an upper portion 8c and a lower portion 8d, and the upper portion 8c of the small-diameter portion 8a serves as the upper barrier portion 26, and the small-diameter portion 8a The lower portion 8d and the large-diameter portion 8b are constituted as the lower barrier portion 28 . In other words, the upper barrier portion 26 (the upper portion 8c of the small-diameter portion 8a) has a smaller cross-sectional area orthogonal to the vertical direction than a part of the lower barrier portion 28 (the large-diameter portion 8b). Moreover, in the piping part 4, it is located in the barrier part 8, and the flange part 27 for 1st valves for attaching the 1st valve 6 mentioned above is formed. Here, the 1st flange part 27 for valves of the piping part 4 can be located below the 2nd flange part 32. In this embodiment, the 1st flange part 27 for valves of the piping part 4 is located in the large-diameter part 8b of the barrier part 8. As shown in FIG. Below, let the upstream part of the extension direction D rather than the flange part 27 for 1st valves among the piping parts 4 be the upstream piping part 4a. In the present embodiment, the small-diameter portion 8a maintains the shape of the cross-section S, however, the upper portion 8c and the lower portion 8d of the small-diameter portion 8a may have different cross-sectional shapes. In this case, the upper barrier part 26 may be smaller than the area of the smallest cross section among the cross sections orthogonal to the up-down direction of the lower wall part 28. As shown in FIG. Moreover, although illustration was abbreviate|omitted in some embodiment, the outer diameter of the flange part 27 for 1st valves may be more than the inner diameter of the lower part 8d of the small-diameter part 8a of the barrier part 8 or more.

A first flange portion 30 is formed at a lower end of the upper barrier portion 26 , and a second flange portion 32 is formed at an upper end of the lower barrier portion 28 . And by fastening the 1st flange part 30 and the 2nd flange part 32 with fastening members, such as the bolt 33, the 2nd flange part 32 is being fixed to the 1st flange part 30. . In addition, the position where the 1st flange part 30 is formed is not limited to the lower end part of the upper side wall part 26. As shown in FIG. The first flange portion 30 is formed at an arbitrary position of the upper barrier portion 26 . Similarly, the position where the second flange portion 32 is formed is not limited to the upper end portion of the lower barrier portion 28 . The 2nd flange part 32 is formed in the arbitrary position of the lower side wall part 28. As shown in FIG.

According to the configuration of the third modification, the upper barrier portion 26 and the lower barrier portion 28 can be easily separated. For this reason, the working efficiency at the time of the initial assembly and maintenance of the piping part 4 with respect to the storage part 2, the 1st valve 6, and the barrier part 8 can be made high. In particular, by locating the flange part 27 for 1st valves of the piping part 4 below the 2nd flange part 32, it becomes possible to make the maintenance efficiency of the 1st valve 6 high. Moreover, since the cross section S in the upper part 8c of the small diameter part 8a can be made small to the end surface vicinity of the piping part 4, at the connection point of the storage part 2 and the barrier part 8, It becomes possible to reduce the generated stress as much as possible.

(4th modification)

With reference to FIG. 7, the fuel tank 1 which concerns on the 4th modification of 1st Embodiment of this indication is demonstrated. Although the 4th modification further limited the structure of the barrier part 8 demonstrated in the 3rd modification, the structure other than that is the same as the structure demonstrated in the 3rd modification.

As shown in FIG. 7, between the 1st flange part 30 and the 2nd flange part 32, the joint 34 which can expand-contract freely in an up-down direction is formed. The seam 34 is, for example, a bellows, and has a pleated shape in which a plurality of mountain folds 35 and valley folds 36 are alternately formed. Moreover, the upper end of the joint 34 is fastened with the 1st flange part 30 by fastening members, such as the bolt 38. Similarly, the lower end of the joint 34 is fastened with the second flange portion 32 by fastening members such as the bolt 40 . The joint 34 is made of a metal or an organic material (eg, rubber, resin) or the like.

According to the configuration of the fourth modification, the displacement generated in the lower barrier portion 28 due to hull oscillation or the like is absorbed by the seam 34 . For this reason, the stress which generate|occur|produces in the connection point of the storage part 2 and the barrier part 8 can be reduced more. Moreover, the working efficiency at the time of the initial assembly and maintenance of the piping part 4 with respect to the storage part 2, the 1st valve 6, and the barrier part 8 can also be made high. Also, the seam 34 is not limited to the bellows structure. For example, other means may be sufficient as long as it is a joint which can expand and contract freely, such as a sleeve-type expansion-contraction pipe joint.

(5th modification)

With reference to FIG. 8, the fuel tank 1 which concerns on the 5th modified example of 1st Embodiment of this indication is demonstrated. Although the 5th modification further limited the structure of the piping part 4 demonstrated in the 4th modification, the structure other than that is the same as the structure demonstrated in the 4th modification. In addition, the 5th modification may further limit the structure of the piping part 4 demonstrated by 1st Embodiment or 1st modification - 3rd modification.

As shown in FIG. 8, the one end 42 of the storage part 2 side of the piping part 4 is located in the storage part 2 (inside the storage space 3). The flange part 44 for airtightness formed in the one end 42 of the piping part 4 is comprised so that the flange (not shown) for airtightness testing which can make the storage space 3 airtight is detachable. Moreover, this flange part 44 for airtightness is comprised so that the 1st strainer 45 comprised so that the foreign material mixed into the fuel F by circulation|circulation of the fuel F can be removed may be attached. In this embodiment, the 1st strainer 45 is fastening with the flange part 44 for airtightness by fastening members, such as the bolt 47. In addition, the 1st strainer 45 may be directly attached to the end 42 of the piping part 4 .

According to the configuration of the fifth modified example, since one end 42 of the pipe part 4 is located in the storage part 2, even if a particulate foreign material is mixed in the fuel F, it is inserted into the storage part 2 and A part of the piping portion 4 with the presence of the storage portion 2 blocks the movement of the foreign matter, it is possible to suppress the foreign matter from being discharged from the storage portion (2).

By the way, when mounting the fuel tank 1 on the ship 100, the 1st valve 6 is attached to the flange part 27 for 1st valves in many cases. Then, after the first valve 6 is mounted, the airtightness of the upstream piping portion 4a is tested. This airtight test is carried out by pressurizing the inside of the upstream piping portion 4a with gas pressure fed by a pump or the like. Since the upstream piping portion 4a communicates with the storage space 3, conventional airtightness In the test, it was necessary to inject gas into the entire storage space 3, which required a lot of time. However, according to the fifth modification, by attaching the airtight flange portion 44 to the airtight flange portion 44 during the airtight test, gas is not injected into the storage space 3 and the airtightness of the upstream piping portion 4a can be tested. For this reason, the time required for implementing an airtight test can be reduced significantly.

Moreover, according to the structure of a 5th modification, since the 1st strainer 45 is attached to the flange part 44 for airtightness, when discharging the fuel F from the storage part 2, it is fuel from the storage part 2 It is possible to suppress the discharge of foreign substances together with (F).

(6th modification)

With reference to FIG. 9, the fuel tank 1 which concerns on the 6th modified example of 1st Embodiment of this indication is demonstrated. The sixth modification further limits the configuration of the bottom part 5 of the storage unit 2 described in the fifth modification, but the configuration other than that is the same as the configuration described in the fifth modification. In addition, the 6th modification may further limit the structure of the bottom part 5 of the storage part 2 demonstrated in 1st Embodiment or 1st modification - 4th modification.

As shown in FIG. 9 , in the bottom part 5 of the storage part 2 , a recessed space 48 is formed by being recessed from a part 46a of the inner surface 46 of the bottom part 5 of the storage part 2 . The recessed part 50 to partition is formed, and the end 42 of the piping part 4 is located in the recessed space 48. As shown in FIG. In embodiment shown in FIG. 9, the flange part 44 for airtightness and the 1st strainer 45 are also located in the recessed space 48. As shown in FIG.

The depression 50 includes a lower wall portion 52 that surrounds the depression space 48 from below, and extends upward from the peripheral edge of the lower wall portion 52 and intersects the depression space 48 in the vertical direction. It is provided with the side wall part 54 which surrounds from the direction which The lower wall part 52 is penetrated by the piping part 4 . The upper barrier part 26 is connected to the side wall part 54, and the 1st flange part 30 is formed in the outer peripheral edge of this upper wall part 26. As shown in FIG.

When the one end 42 of the piping portion 4 is configured to be located in the storage portion 2 , the water level of the fuel F capable of discharging the fuel F from the storage portion 2 rises. For this reason, all the fuel F cannot be discharged|emitted from the storage part 2, but there exists a possibility that a part of fuel F may remain in the storage part 2. On the other hand, according to the configuration of the sixth modification, the one end 42 of the pipe part 4 is recessed from a part 46a of the inner surface 46 of the bottom part 5, so that the recessed space 48 is partitioned. Since it is located inside, most of the fuel F can be discharged|emitted from the storage part 2, and the quantity of the fuel F remaining in the storage part 2 can be made very small.

As shown in FIG. 10, in another embodiment of the 6th modification, the 2nd strainer comprised so that the recessed space 48 was covered from upper direction, and the foreign material mixed into the fuel F by flow|circulation of the fuel F was removable. (56) may be further included. In this embodiment, the 2nd flange part 58 for strainers is formed in the inner surface of the side wall part 54. As shown in FIG. And, by fastening the second strainer 56 and the second strainer flange portion 58 with a fastening member such as the bolt 60, the second strainer 56 is formed on the second strainer flange portion 58. It is fixed.

According to this configuration, since the second strainer 56 covers the recessed space 48 from above, when discharging the fuel F from the storage 2 , it prevents foreign substances from moving into the recessed space 48 . It can be prevented, and it can suppress that a foreign material is discharged|emitted from the storage part 2 together with the fuel F. Moreover, if the depression 50 which partitions the depression space 48 is formed in the bottom part 5 of the storage part 2, the 2nd strainer 56 is formed so that the depression space 48 may be covered from above. Since it is possible to do so, the present disclosure is not limited to other embodiments of the sixth modification. That is, the flange part 44 for airtightness and the 1st strainer 45 are not made into the essential structure for forming the 2nd strainer 56. As shown in FIG.

The contents described in each of the above embodiments are grasped as follows, for example.

(1) A fuel tank 1 according to the present disclosure is a fuel tank mounted on a ship 100 , and includes a storage unit 2 in which fuel F is stored, and a bottom portion 5 of the storage unit downwardly. a pipe part 4 extending and flowing through the fuel; a valve 6 formed in the pipe part first in a direction in which the pipe part extends from the bottom part of the storage part; and a bottom part 5 of the storage part. ) and at least a barrier portion (8) covering at least the valve in an airtight manner, and the barrier portion is lower than the storage portion and is installed in the barrier portion installation portions (12, 13, 22) which are a part of the vessel.

According to the structure as described in said (1), since a barrier part is below a storage part, and is provided in the barrier part installation part which is a part of a ship, a barrier part can be supported from below. For this reason, compared with the case where a barrier part is not provided in a barrier part installation part but hangs on a storage part, since a barrier part can be comprised cheaply and lightweight, the soundness of a fuel tank can be ensured more.

(2) In some embodiments, in the configuration described in (1) above, the barrier portion installation portion includes an installation surface facing the bottom portion of the storage portion, and a part of the barrier portion is the installation surface. is composed

According to the structure described in said (2), a part of a barrier part installation part can be made to function as a barrier part.

(3) In some embodiment, in the structure as described in said (1) or (2), the said barrier part installation part is the deck 12, 22.

According to the structure described in the above (3), since it is relatively easy to provide the barrier portion on the deck, it is possible to easily implement the barrier portion at low cost and light weight.

(4) In some embodiments, in the structure described in any one of (1) to (3) above, the storage unit is mounted on a plurality of saddles (10A, 10B) provided in the barrier unit installation unit, , The plurality of saddles include a fixed saddle (10A) fixed to the storage unit and abutment saddles (10B) in contact with the storage unit, and the pipe unit is closer to the fixed saddle than the abutment saddle. It extends downwardly from the bottom of the section.

According to the configuration described in (4) above, since the displacement of the bottom portion of the storage portion is smaller toward the fixed saddle than the abutting saddle, the stress generated in the piping portion can be reduced.

(5) In some embodiments, in the configuration according to any one of (1) to (4) above, the barrier portion has an area of a cross section orthogonal to the vertical direction, and the barrier portion and the storage portion are connected. It is configured to be smallest in the portion 24 .

According to the structure described in said (5), when the bottom part of a storage part is displaced by thermal contraction or hull shaking, the stress which generate|occur|produces at the connection point of a storage part and a barrier part can be reduced.

(6) In some embodiments, in the configuration according to any one of (1) to (5), the barrier portion includes the upper barrier portion 26 and the lower barrier portion located below the upper barrier portion. 28, a first flange portion 30 is formed on the upper barrier portion, a second flange portion 32 is formed on the lower barrier portion, and the first flange portion is the second flange portion It is configured to be fixed to the

According to the configuration described in (6) above, the upper barrier portion and the lower barrier portion can be easily separated. For this reason, the work efficiency at the time of the initial assembly of a barrier part and the time of maintenance can be made high.

(7) In some embodiments, in the structure described in (6) above, the upper barrier portion has a smaller area of a cross section perpendicular to the vertical direction than the lower barrier portion.

According to the configuration described in (7) above, since the cross section of the upper barrier portion can be made small to the vicinity of the end surface of the pipe portion, it becomes possible to reduce the stress generated at the connection point between the storage portion and the barrier portion as much as possible.

(8) In some embodiments, in the structure described in (6) or (7) above, a freely expandable joint 34 is formed between the first flange portion and the second flange portion. .

According to the configuration described in (8) above, since displacement occurring in the lower barrier portion due to hull oscillation or the like is absorbed at the seam, the stress generated at the connection point between the storage portion and the barrier portion can be further reduced.

(9) In some embodiments, in the configuration according to any one of (1) to (8), one end 42 of the piping part on the storage part side is located in the storage part.

According to the configuration described in (9) above, since one end of the piping portion is located in the storage portion, even if particulate foreign substances are mixed in the fuel, when the fuel is discharged from the storage portion, a part of the piping portion inserted into the storage portion is By preventing the movement of foreign substances, it is possible to suppress the discharge of foreign substances from the storage unit.

(10) In some embodiments, in the configuration described in (9) above, the agent is mounted on one end of the piping portion on the side of the storage portion, and is configured to be capable of removing foreign substances mixed into the fuel by the flow of the fuel. One strainer (45) is included.

According to the configuration described in (10) above, since the first strainer is attached to one end of the piping portion, when the fuel is discharged from the storage portion, it is possible to suppress the discharge of foreign substances together with the fuel from the storage portion. Alternatively, when fuel is injected into the storage unit, it is possible to suppress the injection of foreign substances into the storage unit together with the fuel from the piping unit.

(11) In some embodiments, in the structure described in (9) or (10) above, in the bottom part of the storage part, a recessed space ( 48) is formed, and one end of the storage part side of the pipe part is located in the depression space.

When one end of the pipe portion is configured to be located in the storage portion, the level of fuel capable of discharging the fuel from the storage portion rises. For this reason, all fuel cannot be discharged|emitted from a storage part, but there exists a possibility that a part of fuel may remain in a storage part. However, according to the configuration described in (11) above, since one end of the pipe portion is located in the depression space partitioned by being depressed from a part of the inner surface of the bottom portion, most of the fuel can be discharged from the storage portion and the fuel remaining in the storage portion can be made smaller.

(12) In some embodiments, in the configuration described in (11) above, the second strainer 56 covering the recessed space from above and capable of removing foreign substances mixed into the fuel by the flow of the fuel ) is included.

According to the configuration described in (12) above, since the second strainer covers the recessed space from above, when discharging fuel from the storage unit, foreign substances are prevented from moving into the recessed space, and foreign substances are removed from the storage unit together with the fuel. emissions can be suppressed. Alternatively, when fuel is injected into the storage unit, it is possible to suppress the intrusion of foreign substances into spaces other than the recessed space in the storage unit.

(13) In some embodiments, the ship 100 is equipped with the fuel tank according to any one of (1) to (12) above.

According to the structure described in (13) above, in the fuel tank in which the pipe extends from the bottom of the storage portion, it is possible to provide a ship that can secure more soundness by configuring the storage portion at a lower cost and light weight.

1: fuel tank
2: storage
3: storage space
4: piping
4a: upstream side piping
5: the bottom of the storage unit
6: 1st valve (valve)
7: hull
8: barrier
9: containment space
10A : Rear Saddle (Fixed Saddle)
10B: front saddles (abutting saddles)
12: upper deck (barrier installation part)
14: insulation
20: fuel adjustment unit
22: lower deck (barrier installation part)
26: upper barrier part
27: flange portion for the first valve
28: lower barrier part
30: first flange portion
32: second flange portion
34 : seam
35: mountain fold
36: bone fold
44: Flange for airtightness
45: first strainer
46: the inner surface of the bottom of the storage unit
48: recessed space
50: depression
56: second strainer
100 : ship
D: direction of extension
F : fuel

Claims (13)

A fuel tank mounted on a ship, comprising:
a storage unit for storing fuel;
a pipe part extending downward from the bottom of the storage part and through which the fuel flows;
a valve formed in the pipe portion first in a direction in which the pipe portion extends from the bottom portion of the storage portion;
and a barrier part for sealingly covering at least the valve from the bottom part of the storage part;
The barrier part is lower than the storage part, and the fuel tank, characterized in that it is installed in the barrier part installation part that is a part of the ship. The method of claim 1,
The barrier part installation part includes an installation surface facing the bottom part of the storage part,
A part of the barrier portion is a fuel tank, characterized in that constituted by the installation surface. 3. The method according to claim 1 or 2,
The fuel tank, characterized in that the barrier installation part is a deck. 4. The method according to any one of claims 1 to 3,
The storage unit is mounted on a plurality of saddles installed in the barrier unit installation unit,
The plurality of saddles include a fixed saddle fixed to the storage unit and abutment saddles in contact with the storage unit,
wherein the pipe portion extends downward from the bottom portion of the storage portion closer to the fixed saddle than to the abutment saddle. 5. The method according to any one of claims 1 to 4,
The barrier portion is configured such that an area of a cross section orthogonal to the vertical direction is smallest at a connection portion where the barrier portion and the storage portion are connected. 6. The method according to any one of claims 1 to 5,
The barrier portion is divided into two, an upper barrier portion and a lower barrier portion located below the upper barrier portion,
A first flange portion is formed on the upper barrier portion,
A second flange portion is formed on the lower barrier portion,
The fuel tank according to claim 1, wherein the first flange portion is configured to be fixed to the second flange portion. 7. The method of claim 6,
The upper barrier portion has a smaller area of a cross-section perpendicular to the vertical direction than the lower barrier portion. 8. The method according to claim 6 or 7,
A freely expandable joint is formed between the first flange portion and the second flange portion. 9. The method according to any one of claims 1 to 8,
The fuel tank, characterized in that the one end of the pipe part on the side of the storage part is located in the storage part. 10. The method of claim 9,
and a first strainer mounted on one end of the pipe part on the side of the storage part, and configured to be able to remove foreign substances mixed into the fuel by the flow of the fuel. 11. The method according to claim 9 or 10,
A depression is formed in the bottom portion of the storage unit by being depressed from a portion of the inner surface of the bottom portion to partition a depression space,
One end of the pipe part on the side of the storage part is located in the recessed space. 12. The method of claim 11,
and a second strainer covering the recessed space from above and capable of removing foreign substances mixed into the fuel by the flow of the fuel. A ship equipped with the fuel tank according to any one of claims 1 to 12.

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