Marine vessel

Abstract

A marine vessel according to one embodiment of the present disclosure comprises a hull and all-around lighting equipment provided to the hull. The all-around lighting equipment includes: a front lamp positioned farther to the front side than the center in the front-rear direction of the hull; and a rear lamp positioned farther to the rear side than the center in the front-rear direction of the hull and at the same height as the front lamp.

Description

ship

[0001] The present disclosure relates to marine vessels.

[0002] The liquefied gas carrier described in Patent Document 1 below is equipped with a signal light installed at a position higher than the liquefied gas tank.

[0003] Japanese Patent Application Laid-Open No. 2021-194986

[0004] The signal light described in Patent Document 1 is an all-round light that can be seen horizontally over 360 degrees. Generally, all-round lights are attached to the highest point on a ship. Therefore, if the height of the equipment included in the ship is high, it will block the visibility range of the all-round light, and the all-round light will also be installed at a high position, which may cause operational problems such as the ship being unable to pass under a bridge.

[0005] Therefore, an object of the present disclosure is to provide a vessel that can keep the installation position of an all-around light low.

[0006] A vessel according to one aspect of the present disclosure comprises a hull and an all-around light provided on the hull, the all-around light including a forward light located forward of the center of the hull in the fore-and-aft direction, and a rear light located rearward of the center of the hull in the fore-and-aft direction and at the same height as the forward light.

[0007] According to a vessel according to one aspect of the present disclosure, the installation position of the all-round light can be kept low.

[0008] Fig. 1 is a side view of a ship. Fig. 2 is a plan view of the ship. Fig. 3(a) is a side view of a funnel, and Fig. 3(b) is a rear view of the funnel. Fig. 4 is a diagram showing the horizontal light range of an all-around light.

[0009] A ship 100 according to an embodiment will be described below. Fig. 1 is a side view of the ship 100 according to the embodiment. Fig. 2 is a plan view of the ship 100 according to the embodiment. The ship 100 according to the embodiment is a liquefied gas carrier that transports liquefied gas such as liquefied hydrogen or liquefied natural gas. However, the ship 100 is not limited to a liquefied gas carrier.

[0010] As shown in Figure 1, the watercraft 100 according to this embodiment includes a hull 10 and an all-round light 40 provided on the hull 10. The configuration of the hull 10, the arrangement of the all-round light 40, and the horizontal light range of the all-round light 40 will be described below. Note that, hereinafter, the propulsion direction of the watercraft 100 (to the right on the paper in Figure 1) will be referred to as "forward," and the direction opposite to the propulsion direction of the watercraft 100 (to the left on the paper in Figure 1) will be referred to as "rear." Furthermore, the "forward-backward direction" referred to below refers to a direction along the front and rear.

[0011] <Configuration of the hull> First, the configuration of the hull 10 will be described. As shown in Fig. 1 , the hull 10 is divided into a cargo area 11, a bow area 12, and a stern area 13. The cargo area 11 is located in an area including the center of the hull 10 in the fore-and-aft direction, and is an area for storing liquefied gas as cargo. The bow area 12 is an area forward of the cargo area 11. The stern area 13 is an area aft of the cargo area 11.

[0012] As shown in FIG. 1 , the hull 10 includes a cargo tank 21 , a tank top scaffold 22 , a propulsion engine 23 , a funnel 24 , and a bow mast 25 .

[0013] The cargo tanks 21 are tanks that store liquefied gas as cargo. The cargo tanks 21 are located in the cargo area 11. The hull 10 of this embodiment includes four spherical cargo tanks 21. However, the number and shape of the cargo tanks 21 included in the hull 10 are not limited. Depending on the cargo transported by the ship 100, the hull 10 may not include cargo tanks 21. Furthermore, depending on the type of ship 100, the hull 10 may not include a cargo area 11 in the first place.

[0014] The tank top scaffolding 22 is a scaffolding located on the top of the cargo tank 21. Piping for transferring liquefied gas and measuring instruments for understanding the conditions inside the cargo tank 21 are located at the top of the cargo tank 21. The tank top scaffolding 22 is used as a scaffolding when workers perform maintenance on these pipes, etc. Note that a tank top scaffolding 22 is installed corresponding to each cargo tank 21, and each has a flat top surface suitable for passage and work, and is provided with a passage 26 necessary for use as a scaffolding.

[0015] The propulsion engine 23 is an engine that generates power to propel the hull 10 and onboard electricity. The propulsion engine 23 is located below the upper deck 27 in the stern area 13. In other words, the propulsion engine 23 is located inside the hull 10. The propulsion engine 23 burns fuel in a boiler to generate steam, and uses the generated steam to drive a steam turbine connected to the screw propeller 28. This fuel may be boil-off gas generated in the cargo tank 21, heavy oil, or other liquid fuel. However, the propulsion engine 23 may also be an internal combustion engine that generates power to drive the screw propeller 28. In either case, the propulsion engine 23 of this embodiment generates exhaust gas when generating power and onboard electricity.

[0016] The funnel 24 is a facility that discharges exhaust gas generated by the propulsion engine 23 to the outside of the hull 10. The funnel 24 is located above the upper deck 27 of the stern area 13. Fig. 3(a) is a side view of the funnel 24, and Fig. 3(b) is a rear view of the funnel 24. As shown in Fig. 3(a), a rear light 42 of the all-around light 40 is attached to the rear surface of the funnel 24. The rear light 42 will be described later.

[0017] The chimney 24 is provided with a space through which workers can pass, and as shown in FIG. 3( b), the chimney 24 has an opening 29 through which the rear light 42 can be accessed from inside the chimney 24. That is, a worker can move from inside the chimney 24 through the opening 29 to the rear light 42, or can extend his or her arm from inside the chimney 24 through the opening 29 to work on the rear light 42. Therefore, the size of the opening 29 may be large enough for a worker to pass through, or may be large enough for the worker's arm to pass through. The shape of the opening 29 is also not limited.

[0018] Furthermore, the chimney 24 has an opening / closing window 30 that can open and close the opening 29. The type of opening / closing window 30 is not limited, and the opening / closing window 30 may be a window that is attached to the periphery of the opening 29 via a hinge, or may be a window that is detachable from the opening 29. Since the chimney 24 of the present embodiment has the opening 29 and the opening / closing window 30, when the propulsion engine 23 is stopped, an operator can open the opening / closing window 30 and access the rear light 42 from inside the chimney 24 through the opening 29. This allows an operator to easily perform work such as maintenance on the rear light 42.

[0019] The bow mast 25 is a mast located in the bow area 12. In this embodiment, the bow mast 25 is provided on the upper surface of a bow structure 31 located in the bow area 12. Therefore, the vertical dimension of the bow mast 25 in this embodiment can be made smaller than when the bow mast 25 is provided directly on the upper deck 27. The bow mast 25 may also be equipped with other equipment such as a radar, or may be dedicated to the forward light 41. The bow structure 31 on which the bow mast 25 is installed includes the bridge. However, in addition to the bridge, the bow structure 31 may also include accommodation areas where passengers work and live.

[0020] <Layout of All-Round Light> Next, the layout of the all-round light 40 will be described. The all-round light 40 is a signal light that can be seen horizontally 360 degrees. Typically, the all-round light 40 is installed at a high position on the hull 10 so that it can be seen horizontally 360 degrees. However, when the hull 10 is high because it has cargo tanks 21, as in the hull 10 of this embodiment, installing the all-round light 40 may cause operational problems, such as making it impossible to pass under bridges. Therefore, in this embodiment, the all-round light 40 is divided into a forward light 41 and a rear light 42, and the all-round light 40 is installed at a low position. This will be described in detail below.

[0021] As shown in FIG. 1, the vessel 100 according to this embodiment is equipped with three all-round lights 40 arranged vertically (see FIG. 3). Each all-round light 40 is, for example, an indicator light for a vessel with restricted navigation or a vessel with a limited draft, and the light color differs depending on the purpose and regulations. However, the number and types of all-round lights 40 equipped on the vessel 100 are not limited. For example, the vessel 100 may be equipped with only one all-round light 40.

[0022] As described above, each all-around light 40 includes a forward light 41 and a rear light 42. The forward light 41 and the rear light 42 are located at the same height. That is, each rear light 42 is located at the same height as the corresponding forward light 41. Furthermore, the installation position of each forward light 41 and each rear light 42 is lower than the tank top. That is, in this embodiment, the installation position of the all-around light 40 is kept low. Note that the above-mentioned "tank top" refers to the top of the cargo tank 21 when no equipment associated with the cargo tank 21 (such as piping or the tank top scaffolding 22) is installed on the top of the cargo tank 21, or refers to the highest-positioned equipment among the equipment associated with the cargo tank 21 when equipment associated with the cargo tank 21 is installed on the top of the cargo tank 21.

[0023] Of the forward light 41 and rear light 42 included in the all-around light 40, the forward light 41 is located forward of the center of the hull 10 in the fore-and-aft direction. Specifically, the forward light 41 is located in the bow area 12 of the hull 10. Furthermore, the forward light 41 in this embodiment is provided on the front side of the bow mast 25 via a support member 43. However, the installation position of the forward light 41 is not limited to this. For example, the forward light 41 may be provided on the front side of the bow structure 31.

[0024] On the other hand, the rear light 42 is located rearward of the center of the hull 10 in the fore-and-aft direction. Specifically, the rear light 42 is located in the stern area 13 of the hull 10. Furthermore, in this embodiment, the rear light 42 is provided on the rear surface of the funnel 24 via a support member 44 (see FIG. 3(a)). However, the installation position of the rear light 42 is not limited to this. For example, a stern mast may be installed in the stern area 13, and the rear light 42 may be provided on the rear surface of the stern mast.

[0025] <Horizontal Light Emission Range of All-Around Light> Next, the horizontal light emission range of the all-around light 40, that is, the light emission range of the all-around light 40 in the horizontal direction, will be described. Note that in this embodiment, all three all-around lights 40 have the same horizontal light emission range. The hatched areas in FIG. 2 indicate the horizontal light emission ranges of the front light 41 and the rear light 42. As shown in FIG. 2, the front light 41 does not emit light in all directions, but rather limits light emission toward the rear. For example, by providing a partition behind the light source of the front light 41, the light emission toward the rear of the front light 41 can be limited. On the other hand, in contrast to the front light 41, the rear light 42 limits light emission toward the front.

[0026] The horizontal light irradiation range of the front lamp 41, in a plan view, includes the front and is a range between an angular position more than 90 degrees clockwise from the front and an angular position more than 90 degrees counterclockwise from the front. In other words, the horizontal light irradiation range of the front lamp 41, in a plan view, is an angular range wider than 180 degrees. On the other hand, the horizontal light irradiation range of the rear lamp 42, in a plan view, includes the rear and is a range between an angular position less than 90 degrees clockwise from the rear and an angular position less than 90 degrees counterclockwise from the rear. In other words, the horizontal light irradiation range of the rear lamp 42, in a plan view, is an angular range narrower than 180 degrees. Note that it is desirable to set the horizontal light irradiation range of the front lamp 41 and the horizontal light irradiation range of the rear lamp 42 so that the area not included in either horizontal light irradiation range (blind zone) is as small as possible.

[0027] Figure 4 is a diagram showing the horizontal light irradiation range of the all-round light 40. Figure 4 shows a wider area of ​​the horizontal light irradiation range of the all-round light 40 than that shown in Figure 2. The hatched areas in Figure 4 indicate the horizontal light irradiation ranges of the front light 41 and the rear light 42. The circle X drawn with a dashed line in Figure 4 is a circle with a radius Y centered at the center of the hull 10. As shown in Figure 4, the horizontal light irradiation range of the front light 41 and the horizontal light irradiation range of the rear light 42 overlap at a position at least a predetermined distance Y (radius Y) away from the hull 10.

[0028] Therefore, at a point a predetermined distance Y away from the hull 10, that is, at any point on the circle X, the light of either the forward light 41 or the rear light 42 can be seen. In other words, at any point a predetermined distance Y away from the hull 10, the all-around light 40 can be seen, and the all-around light 40 does not appear double. Note that the predetermined distance Y is, for example, 1 nautical mile (1,852 m). As described above, the forward light 41 and the rear light 42 are located at the same height. Therefore, if a ship other than the ship 100 according to this embodiment moves on the circle X, the height position of the all-around light 40 as seen from that ship will not change.

[0029] As described above, in this embodiment, the all-around light 40 is divided into the front light 41 and the rear light 42, but the all-around light 40 is visible horizontally over 360 degrees. In other words, the light of the front light 41 is visible from the front and sides of the hull 10, and the light of the rear light 42 is visible from the rear of the hull 10. Therefore, the all-around light 40 of this embodiment can be installed low while still functioning as an all-around light.

[0030] <Summary> The first item disclosed in this specification is a vessel comprising a hull and an all-around light provided on the hull, the all-around light including a forward light located forward of the center of the hull in the fore-and-aft direction, and a rear light located aft of the center of the hull in the fore-and-aft direction and at the same height as the forward light.

[0031] With this configuration, the light from the front lights is visible from the front of the hull, and the light from the rear lights is visible from the rear of the hull, regardless of the height positions of the front lights and rear lights. Therefore, with the above configuration, the installation position of the all-around light can be kept low.

[0032] A second item disclosed in this specification is the watercraft described in the first item, in which the front light limits the light emitted rearward, the rear light limits the light emitted forward, and the horizontal light emission range of the front light and the horizontal light emission range of the rear light overlap at a position that is more than the specified distance away from the hull.

[0033] With this configuration, the light from either the front light or the rear light can be seen at a point a predetermined distance from the hull. In other words, the all-around light can be seen at a point a predetermined distance from the hull regardless of the angle position at that point, and the all-around light will not be seen double.

[0034] A third item disclosed in this specification is the watercraft described in the first or second item, wherein the forward light is located in a bow area forward of a cargo area of ​​the hull that accommodates cargo, and the rear light is located in a stern area aft of the cargo area.

[0035] With this configuration, even if tall equipment such as cargo tanks is located in the cargo area, the all-around light can be seen from all directions.

[0036] A fourth item disclosed in this specification is the vessel described in the third item, wherein the hull includes a cargo tank located in the cargo area and storing the cargo, and the installation positions of the forward light and the rear light are lower than the tank tops of the cargo tanks.

[0037] With this configuration, the all-round light is installed lower than the top of the cargo tank, so the installation of the all-round light does not increase the height of the hull, thereby preventing operational problems such as the inability of the ship to pass under the bridge due to an increase in the hull height.

[0038] A fifth item disclosed in this specification is the vessel described in the third item, wherein the hull includes a propulsion engine located in the stern area that generates power to propel the hull, and a funnel located in the stern area that discharges exhaust gas generated by the propulsion engine, and the rear light is provided on the rear surface of the funnel.

[0039] With this configuration, there is no need to provide a mast on the hull for mounting the rear light, which reduces the manufacturing costs of the vessel.

[0040] A sixth item disclosed in this specification is the marine vessel according to the fifth item, wherein the funnel has an opening through which the rear light can be accessed from inside the funnel, and an opening / closing window through which the opening can be opened and closed.

[0041] This configuration allows workers to easily perform maintenance of the rear lights and other tasks.

[0042] 10 Hull 11 Cargo area 12 Bow area 13 Stern area 21 Cargo tank 22 Tank top scaffolding 23 Propulsion engine 24 Funnel 29 Opening 30 Openable window 40 All-around light 41 Forward light 42 Rear light 100 Ship

Claims

1. A vessel comprising: a hull; and an all-around light provided on the hull, the all-around light including a forward light located forward of the center of the hull in the fore-and-aft direction; and a rear light located aft of the center of the hull in the fore-and-aft direction and at the same height as the forward light.

2. A vessel as described in claim 1, wherein the forward light limits the light emitted rearward, the rear light limits the light emitted forward, and the horizontal light emission range of the forward light and the horizontal light emission range of the rear light overlap at a position that is a predetermined distance or more away from the hull.

3. A vessel according to claim 1 or 2, wherein the forward light is located in a bow area forward of a cargo area of ​​the hull that accommodates cargo, and the rear light is located in a stern area aft of the cargo area.

4. A vessel according to claim 3, wherein the hull includes a cargo tank located in the cargo area for storing the cargo, and the installation positions of the forward light and the rear light are lower than the tank tops of the cargo tanks.

5. A vessel according to claim 3, wherein the hull includes a propulsion engine located in the stern area and generating power to propel the hull, and a funnel located in the stern area and discharging exhaust gas generated by the propulsion engine, and the rear light is located on the rear surface of the funnel.

6. A vessel according to claim 5, wherein the funnel has an opening through which the rear light can be accessed from inside the funnel, and an opening / closing window that can open and close the opening.

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