Oil Boom Equipment

Abstract

To realize quick sinking with short sinking time by securing smooth sinking from a forced sinking portion toward an air supply / exhaust connection portion regardless of an inner diameter size of an air supply / exhaust hose.SOLUTION: A plurality of floating and sinking oil fences 1 are connected to surround a mooring facility 101 in a harbor and a moored tanker T. There are provided two air supply / exhaust connection portions 12 performing air supply / exhaust of floats 7, to make the floating and sinking oil fences 1 float and sink by supplying and exhausting air. There is provided a forced sinking portion buoyancy body 29 whose upper end communicates with the floats 7 of the oil fences 1 and whose lower end opens underwater in a forced sinking portion 21 sinking earliest when sinking at an intermediate position between the air supply / exhaust connection portions 12. A passage cross section of an air supply / exhaust hose 41 provided in the air supply / exhaust connection portions 12 is made to be in a range of 3.4 to 3.8% of a passage cross section of the floats 7.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an oil fence device that surrounds a tanker while the tanker is moored to a mooring facility in a port. [Background technology]

[0002] Conventionally, an oil fence device has been known in which a sink-and-float oil fence surrounds a tanker moored to mooring equipment in a port while the tanker is moored to the mooring equipment in the port (see, for example, Patent Document 1). This type of oil fence device is configured by connecting a plurality of sink-and-float oil fences via a plurality of connectors to surround the tanker moored to the mooring equipment in the port and the mooring equipment. This oil fence has a strip-shaped body with a certain width in the vertical direction (depth direction) of the fence, and a float is integrally provided along the fence longitudinal direction at the middle position of the strip in the vertical direction of the fence, and a number of weights are provided at intervals along the fence longitudinal direction at the bottom.

[0003] Then, two of the connectors are provided with air supply and exhaust hoses to serve as air supply and exhaust connection parts for supplying and exhausting air to and from the float, and the remaining connector is provided with a communication hose to connect the ends of adjacent floats to serve as a communication connection part. The air inside the float is supplied and exhausted through the air supply and exhaust hoses to cause the floating-sinking oil fence to rise and fall. In this case, the intermediate position between the air supply and exhaust connection parts serves as a forced sinking part that sinks the fastest when sinking.

[0004] By the way, with the oil fence device described above, the sinking and floating oil fence needs to be lowered when a tanker departs, but the current situation is that it takes about 25 minutes for the fence to be lowered to a level where a tanker can pass through.

[0005] In recent years, there has been a demand for quickly disconnecting the tanker from the mooring equipment in the event of an emergency such as an earthquake, and for the tanker to be moved as far offshore as possible in order to avoid the effects of the earthquake, etc. Therefore, it is desirable to be able to lower the oil boom as quickly as possible.

[0006] It has also been proposed that in the event of an emergency such as a tsunami, the section corresponding to the bow of a tanker be quickly lowered to allow the tanker to quickly leave port and evacuate (see, for example, Patent Document 2). However, there is a strong demand to be able to quickly lower the entire oil fence by gradually lowering it from the forced submersion section towards the air supply and exhaust connection section, taking into consideration not only emergencies but also normal situations.

[0007] In view of this, it has been proposed to provide an exhaust section near the exhaust connection section that has an exhaust valve and uses the exhaust valve to exhaust the float (see, for example, Patent Document 3), but this creates the need to provide extra structures such as the exhaust section and a platform on which the exhaust section is mounted.

[0008] Therefore, in order to eliminate the need for such extra structures, it is conceivable to increase the inner diameter of the supply and exhaust hose, including the flange attached to the main body (changing the nominal diameter from 50A to 80A), thereby increasing the exhaust capacity from the supply and exhaust connection side. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2001-348854 A [Patent Document 2] JP 2015-22760 A [Patent Document 3] JP 2016-245018 A Summary of the Invention [Problem to be solved by the invention]

[0010] However, if the inner diameter of the supply / exhaust hose is increased, the amount of exhaust air from the supply / exhaust hose increases, but it becomes difficult to control the forced sinking section to sink first, and then to sink sequentially toward the supply / exhaust connection section. In other words, because the amount of exhaust air from the supply / exhaust hose becomes too large, the movement of air inside the float from the forced sinking section toward the supply / exhaust connection section does not keep up with the amount of exhaust air, and air pockets form in any part of the float, causing poor sinking, and preventing the float-and-float function from functioning effectively.

[0011] The inventor then came up with the idea that by not only increasing the inner diameter of the supply and exhaust hose but also making the forced sinking section sink more quickly, it would be possible to increase the movement (flow) of the air inside the float from the forced sinking section to the supply and exhaust connection section and match the exhaust speed through the supply and exhaust hose, thereby ensuring smooth sinking from the forced sinking section to the supply and exhaust connection section and shortening the sinking time, and thus created the present invention.

[0012] The present invention aims to provide an oil fence device that can achieve rapid subsidence with a short subsidence time by increasing the inner diameter of the supply and exhaust hose, accelerating the subsidence speed of the forced subsidence section, and ensuring smooth subsidence from the forced subsidence section toward the supply and exhaust connection section. [Means for solving the problem]

[0013] The invention of claim 1 is configured such that a plurality of sink-and-float oil fences are connected via a plurality of connectors to surround a mooring facility in a port and a tanker moored to the mooring facility, The oil fence has a band-shaped body having a constant width in the fence up-down direction, a float is integrally provided along the fence longitudinal direction at a middle position of the band-shaped body in the fence up-down direction, and a plurality of weights are provided at intervals along the fence longitudinal direction at a lower portion, In an oil fence device, air supply and exhaust hoses are provided to two of the multiple connectors to form air supply and exhaust connection parts for supplying and exhausting air to and from the float, and the floating and sinking type oil fence is caused to float and sink by supplying and exhausting air through the air supply and exhaust hose, and a forced submersion section which sinks the fastest when sinking and is located at a midpoint between the air supply and exhaust connection parts is provided with a forced submersion section buoyancy body whose upper end is connected to the float of the oil fence and whose lower end is open into the water, and whose lower part has a plurality of weights which balance the buoyancy generated in the forced submersion section buoyancy body, The weights provided at intervals on the lower part of the band-shaped body are arranged so that the first weights provided on both sides of the forced sinking part have a larger weight per unit length than the second weights provided on other parts, The cross-sectional area of ​​the passage of the air supply / exhaust hose is within a range of 3.4 to 3.8% of the cross-sectional area of ​​the passage of the float. and the ratio of air moving to the air supply / exhaust connection part of the float caused by the sinking of the buoyant body of the forced sinking part is balanced with the ratio of air exhausted through the air supply / exhaust hose. The characteristic of this is that it is "balanced." Note that "balanced" also includes cases where the weight is slightly heavy. Furthermore, "the first weights provided on both sides of the forced sinking portion are arranged so that they have a greater weight per unit length than the second weights provided in other portions" means that the arrangement spacing of the first weights is smaller than the arrangement spacing of the second weights, and that the first weights are heavier than the second weights.

[0014] In this way, the forced sinking section is first to sink, and then the sections to the air supply / exhaust connection are sequentially set to sink, shortening the sinking time of the oil fence. In particular, since the forced sinking section buoyant body is provided, the inner diameter of the air supply / exhaust hose is large, and the passage cross-sectional area of ​​the air supply / exhaust hose is set to be in the range of 3.4 to 3.8% of the passage cross-sectional area of ​​the float, the rate of exhaust through the air supply / exhaust hose is balanced with the rate of movement of the air in the float to the air supply / exhaust connection as the forced sinking section buoyant body sinks, and the exhaust operation is performed smoothly. Therefore, even if the amount of exhaust is large, the float will sink smoothly and quickly from the forced sinking section to the air supply / exhaust connection without creating an air pocket in the float. In addition, the first weights provided on both sides of the forced sinking section are arranged so that they have a greater weight per unit length than the second weights provided in other sections, so that the forced sinking section sinks quickly regardless of the inner diameter of the air supply and exhaust hose.

[0015] In this case, the inner diameter of the supply / exhaust hose can be 73.9 to 78.1 mm and the inner diameter of the float can be 400 mm as described in claim 2, and the hose length of the supply / exhaust hose can be 45 to 90 m as described in claim 3. In this way, the amount of exhaust air from the supply / exhaust hose can be increased compared to conventional methods, which is advantageous in shortening the time it takes for the oil fence to sink.

[0018] Claim 4 As described above, it is desirable that the buoyant body of the forced sinking section has a water drainage member that drains seawater from within the float to the outside when the oil fence floats up.

[0019] In this way, even if seawater enters the float due to damage or the like, when the oil fence is floated up, the seawater is collected within the buoyancy body of the forced sinking section and discharged through the water drainage member.

[0020] In these cases, Claim 5 As described above, it is desirable that the mooring equipment includes a platform on which an oil fence operating device is placed, one hose end of the supply and exhaust hose is connected to the oil fence operating device and the other hose end is connected to the float via an supply and exhaust hose connecting pipe, and that the oil fence operating device controls the supply and exhaust of the float through the supply and exhaust hose and the supply and exhaust hose connecting pipe. Effect of the Invention

[0021] The present invention ensures smooth sinking from the forced sinking section toward the air supply and exhaust connection section, and realizes rapid sinking with a short sinking time. In other words, since a buoyant body is provided for the forced sinking section and the passage cross-sectional area of ​​the air supply and exhaust hose is set in the range of 3.4 to 3.8% of the passage cross-sectional area of ​​the float, the ratio of air in the float moving to the air supply and exhaust connection section due to the sinking of the buoyant body for the forced sinking section and the ratio of air exhausted through the air supply and exhaust hose are balanced, and the exhaust operation is performed smoothly. Therefore, even if the inner diameter of the air supply and exhaust hose is increased to increase the amount of exhaust, the float will sink smoothly and quickly in order from the forced sinking section toward the air supply and exhaust connection section, allowing the tanker to depart early. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is a schematic plan view of an oil boom device of the present invention showing a tanker moored to a mooring facility; [Diagram 2] 2(a) is a front view, FIG. 2(b) is a plan view, FIG. 2(c) is a side view, and FIG. 2(d) is a cross-sectional view taken along line AA in FIG. 2(a). [Diagram 3] 3A, 3B, and 3C show the forced sinking portion of the oil fence device, in which (a) is a front view, (b) is a plan view, and (c) is a side view. [Figure 4] FIG. 2 is a front view showing the general part (communicating connection part) of the oil fence device. [Diagram 5] 3A to 3C show the supply and exhaust hoses of the oil fence device, in which (a) is a front view, (b) is a left side view, and (c) is a view showing the connection portion. [Figure 6] This figure shows the relationship between the piping size of the supply and exhaust hose and the sinking time when the float diameter is 400 mm. [Figure 7] This is a diagram showing the relationship between hose length and sinking time when the float diameter is 400 mm and the supply and exhaust hose piping size is 80A. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0024] FIG. 1 is a schematic plan view of an oil boom device of the present invention, showing a tanker moored to mooring equipment.

[0025] As shown in Fig. 1, a tanker T is moored to a mooring facility 101, and oil loading and unloading operations are carried out. The mooring facility 101 is composed of a large platform 102 at the center and small platforms 103 spaced apart, with the platforms 102, 103 connected by a pier 104. Although not specifically shown, oil supply and discharge piping from an oil storage facility such as an oil tank installed on land is connected to the oil discharge port of the tanker T through the large platform 102. In this way, oil is supplied and discharged between the tanker T and the oil storage facility.

[0026] An oil fence device 3 that surrounds the tanker T and mooring equipment 101 is formed by connecting multiple types of sink-and-float oil fences 1 with different fence lengths (all are shown as 1 even if the lengths are different) via connectors 2. Each oil fence 1 is tensioned with ropes 5 with numerous anchors 4 to prevent it from moving.

[0027] Adjacent oil fences 1 are connected by a connector 2. As shown in FIG. 2, the connector 2 is configured as an intake and exhaust connection section 12, 12 provided with an intake and exhaust hose connection pipe 11, 11 to which an intake and exhaust hose 41 for intake and exhaust of the float 7 is connected, as shown in FIG. 3, as a forced sinking section 21, 21 provided at an intermediate position between two intake and exhaust connection sections 12, 12 and sinking the earliest when the oil fence 1 sinks, or as shown in FIG. 4, as a communication connection section 52 provided with a communication hose 51 for connecting adjacent floats 7 to each other and connecting adjacent floats 7 to each other. The upper end of each intake and exhaust hose connection pipe 11 is connected to the end of the float 7, and the lower end is connected to a hose end of an intake and exhaust hose 41 extending from an oil fence operation device arranged on a platform 103, for example, though not specifically shown, and the intake and exhaust control of the float 7 is performed through each intake and exhaust hose 41 and the intake and exhaust hose connection pipe 11 by the oil fence operation device. In addition, it is not necessary to provide two supply / exhaust hose connection pipes 11 (supply / exhaust hose 41) in the supply / exhaust connection portion 12, and it is also possible to provide only one.

[0028] As shown in Figure 4, each oil fence 1 comprises a band 6 having a constant width in the vertical direction (depth direction) of the fence, and a float 7 is provided integrally along the longitudinal direction of the fence at the midpoint of the band 6 in the vertical direction. The band 6 is, for example, a rubber sheet containing a reinforcing fabric core, and a number of weights 8 are provided at intervals along the lower part of the band 6 in the longitudinal direction of the fence to increase floating stability.

[0029] As shown in Fig. 2, the supply and exhaust connection part 12 has flanged nipple holders 13 provided at the opposing ends of adjacent floats 7, and is joined by upper and lower supply and exhaust connection fittings 14A, 14B. The supply and exhaust connection part 12 is made to float by an auxiliary float 15. A flanged nipple 16 communicating with the end of an adjacent float 7 is supported by the flanged nipple holder 13, and the supply and exhaust hose connection pipes 11, 11 are connected to the flanged nipple 16 via an elbow 17 and a flexible joint 18. As a result, the supply and exhaust hose 41 is connected to the float 7 via the supply and exhaust hose connection pipes 11, 11, the flexible joint 18, the elbow 17, and the nipple 16.

[0030] In the forced sinking parts 21, 21, as shown in Fig. 3, flanged nipple holding metal fittings 22, 22 are provided at the opposing ends of the adjacent floats 7, and are connected by forced sinking part connecting metal fittings 23A, 23B arranged vertically apart. A flanged nipple 24 is provided at the vertical middle of the holding metal fittings 22, 22, and they are connected by a main pipe 26 having a safety valve 25. A rubber cover 27 is provided between the nipple holding metal fittings 22, 22. A forced sinking part buoyant body 29 is provided below the forced sinking parts 21, 21, with flanged nipple holding metal fittings 28, 28 provided above and below. The upper end of the forced sinking part buoyant body 29 is connected to the float 7 of the oil fence 1, the lower end is open to the water, and a plurality of weights 30 that are slightly heavier or that balance the buoyancy generated in the forced sinking part buoyant body 29 are stacked on the lower part.

[0031] The upper forced sinking part connecting fitting 23A is provided with a drain pipe 32 having a valve 31 at its upper end and connected at its lower end to the main pipe 26. At the same time, the forced sinking part buoyant body 29 is provided with an interior drain hose 34 extending in the vertical direction and connected at its upper end to the main pipe 26 via a flexible joint 33.

[0032] On both sides of the forced sinking portion 21, a plurality of forced sinking portion weights 35 (26.5 kg / set) heavier than the weight 8 are provided at regular intervals along the longitudinal direction of the fence on the lower part of the band-shaped body 6.

[0033] That is, the weights 8 are mostly arranged regularly at regular intervals, but on both sides of the forced sinking section 21, forced sinking weights 35 heavier than the weights 8 are provided at regular intervals. Therefore, when the air inside the float 7 is exhausted, the forced sinking section 21 where the forced sinking weights 35 are provided will sink faster than other parts where the weights 8 are provided.

[0034] The supply / exhaust hose 41 connected to the supply / exhaust hose connecting pipes 11, 11 has a nominal diameter of 80A, and is provided with nipples 43 with flanges 42 at both ends, as shown in Fig. 5(a). On the outside of the inner rubber 44, a reinforcing cord 45, a reinforcing wire 46, an intermediate rubber 47, a reinforcing cord 48, and an outer rubber 49 are provided in this order.

[0035] Table 1 shows the inner diameter (mm) of the supply and exhaust hose, and Table 2 shows the cross-sectional area (m 2 ) are shown according to the pipe size. [Table 1] [Table 2] The inner diameter of the supply and exhaust hose 41 (piping size 80A) is 73.9 to 78.1 mm, which is larger than the conventional one. The cross-sectional area of ​​the supply and exhaust hose is 0.004289 to 0.004790 m 2 It is. [Table 3]

[0036] Since the inner diameter of the float 7 is 400 mm, as shown in Table 3, the ratio of the passage cross-sectional area of ​​the supply and exhaust hose 41 to the float 7 is 0.0341 to 0.0381, and the passage cross-sectional area of ​​the supply and exhaust hose 41 is in the range of 3.4 to 3.8% of the passage cross-sectional area of ​​the float 7. If the passage cross-sectional area of ​​the supply and exhaust hose 41 is in the range of 3.4 to 3.8% of the passage cross-sectional area of ​​the float 7, in the case where the forced submersion support 29 as described above is provided, the proportion of the air in the float 7 that moves to the supply and exhaust connection part 12 as the forced submersion buoyancy body 29 sinks and the proportion of the air that is exhausted through the supply and exhaust hose 41 are balanced, so that the generation of air accumulation in the float 7 of the oil fence 1 when the forced submersion buoyancy body 19 sinks is suppressed, and smooth and quick exhaust is achieved. As shown in FIG. 6, it can be seen that the sinking time (the time required for the portion indicated by the dashed dotted line in FIG. 1 (length 278 m) to sink) is significantly reduced compared to the conventional case (50A).

[0037] 7, the longer the hose length of the supply / exhaust hose 41, the longer the sinking time, so it is desirable that the length be in the range of 45 to 90 m. The length of the supply / exhaust hoses 41 is adjusted by fastening flanges 42 together using bolts 50 and nuts 51.

[0038] In this way, the weights of the weights 30, 35 of the forced sinking section 21 are determined by calculation and experiment so that the proportion of the air inside the float 7 that moves to the air supply / exhaust connection section 41 as the forced sinking section buoyancy body 29 sinks is balanced with the proportion of the air that is exhausted through the air supply / exhaust hose 41.

[0039] According to the oil fence device 3, the oil fence 1 sinks to the seabed before the tanker T enters the port and is moored to the mooring equipment 101. Then, when the tanker T enters the port and is moored to the mooring equipment 101, an oil fence operating device (not shown) is operated to introduce air into the floats 7 of each oil fence 1 through the air supply and exhaust hose 41 and the communication hose 51 at the air supply and exhaust connection part 12. This causes the oil fence 1 to rise to the sea surface due to the buoyancy of the floats 7 into which air has been introduced.

[0040] Even if seawater has entered the float 7 due to damage or the like, the seawater is collected in the forced sinking section buoyant body 22 by introducing air. Then, when the float 7 rises up, the seawater is discharged through the water drainage pipe 32 and the internal water drainage hose 34.

[0041] Since the oil fence 1 is connected in advance to ropes 5 with a number of anchors 4, when it rises to the surface of the sea it is placed in a fixed position in a floating state, and is prevented from drifting.

[0042] At this time, the mooring equipment 101 is also surrounded by the oil fence 1 together with the tanker T. As a result, even if oil loading and unloading work is started and oil leaks from an oil discharge port or the like, the oil fence 1 prevents the oil from spreading to the surrounding area.

[0043] Then, when the oil loading work is completed, or when the work is completed and the tanker T is ready to depart, the oil fence operating device is operated to exhaust the air from within the floats 7 of the oil fence 1 through the supply and exhaust hoses 41, 41 at each supply and exhaust connection 12. Since the floats 7 are interconnected by the communication hose 51, air is exhausted from all of the floats 7. This causes the oil fence 1 to sink below the sea surface.

[0044] At this time, the forced sinking parts 21, 21 where the oil fence will sink first will be located at the center position between the supply and exhaust connections 12. In other words, the forced sinking buoyancy body 29, which is under higher water pressure than the float 7, will collapse first, and because the forced sinking weight 35 is provided, the balance of buoyancy will be lost and the forced sinking parts 21, 21 will start to sink, and the oil fence 1 will sink gradually towards the supply and exhaust connections 12.

[0045] At this time, the inner diameter of the supply / exhaust hose connecting pipe 11 and the supply / exhaust hose 41,41 is larger than that of the conventional one, and the amount of exhaust air per hour through the supply / exhaust hose connecting pipe 11 and the supply / exhaust hose 41,41 is larger than that of the conventional one. However, since the forced sinking buoyant body 29 is provided and the passage cross-sectional area of ​​the supply / exhaust hose is set to be in the range of 3.4 to 3.8% of the passage cross-sectional area of ​​the float, the rate of exhaust air through the supply / exhaust hose 41,41 is balanced with the rate of decrease in the amount of air in the float 7 due to the sinking of the forced sinking part 21. Therefore, when the forced sinking part 21,21 starts to sink, the oil fence 1 sinks in order toward each supply / exhaust connection part 12 without air remaining in the float 7. Since the amount of exhaust air through the supply / exhaust hose 41,41 is larger than that of the conventional one, the time required for the oil fence 1 to sink is shorter than that of the conventional one. In addition, since each oil fence 1 is connected to a rope 5 with a large number of anchors 4, drifting is prevented.

[0046] As described above, not only are the inner diameters of the supply and exhaust hose connecting pipe 11 and the supply and exhaust hoses 41, 41 made larger than before, but the passage cross-sectional area of ​​the supply and exhaust hose is set in the range of 3.4 to 3.8% of the passage cross-sectional area of ​​the float, and a forced subsidence buoyancy body 29 is provided below the forced subsidence section 21.This makes it possible to balance the rate of exhaust through the supply and exhaust hoses 41, 41 with the rate of decrease in the amount of air in the float 7 due to the subsidence of the forced subsidence section 21, and allows the oil fence 1 to be lowered in sequence from the forced subsidence section 21 toward each supply and exhaust connection section 12 without air being trapped in the float 7.

[0047] As described above, the preferred embodiments of the present invention have been described with reference to the drawings, but various additions, modifications, and deletions can be made without departing from the spirit of the present invention. [Explanation of symbols]

[0048] 1. Floating oil boom 2 Connector 3. Oil Boom Device 4. Anchor 5. Rope 6. Band 7. Float 8 Weight 11 Intake and exhaust hose connection pipe 12 Intake and exhaust connection 14A, 14B Intake and exhaust fittings 21 Forced subsidence 29 Forced sinking buoyancy body 30 Weight 32 Water drainage pipe 34 Interior drain hose 35 Forced sinking weight 41 Intake and exhaust hose 101 Mooring Equipment T Tanker

Claims

1. A plurality of sinking and floating oil fences are connected via a plurality of connectors to surround a mooring facility in a port and a tanker moored to the mooring facility, The oil fence has a band-shaped body having a constant width in the fence up-down direction, a float is integrally provided along the fence longitudinal direction at a middle position of the band-shaped body in the fence up-down direction, and a plurality of weights are provided at intervals along the fence longitudinal direction at a lower portion, An oil fence device in which an air supply and exhaust hose is provided to two of the multiple connectors to serve as an air supply and exhaust connection section for supplying and exhausting air to and from the float, and the floating-sink type oil fence is caused to float or sink by supplying and exhausting air through the air supply and exhaust hose, A forced sinking section that sinks the fastest at an intermediate position between the air intake and exhaust connection sections is provided with a forced sinking section buoyancy body whose upper end is connected to the float of the oil fence and whose lower end is open to the water and whose lower part has a plurality of weights that balance the buoyancy generated in the forced sinking section buoyancy body; The weights provided at intervals on the lower part of the band-shaped body are arranged so that first weights provided on both sides of the forced sinking part have a weight per unit length greater than that of second weights provided on other parts; The passage cross-sectional area of ​​the air supply / exhaust hose is in the range of 3.4 to 3.8% of the passage cross-sectional area of ​​the float, and the proportion of air exhausted through the air supply / exhaust hose is balanced with the proportion of air moving to the air supply / exhaust connection part of the float accompanying the sinking of the buoyant body of the forced sinking part. An oil boom device characterized by:

2. 2. The oil fence device according to claim 1, wherein the inner diameter of the air supply and exhaust hose is 73.9 to 78.1 mm, and the inner diameter of the float is 400 mm.

3. An oil fence device as described in claim 1 or 2, wherein the hose length of the supply and exhaust hose is 45 to 90 m.

4. An oil fence device as described in any one of claims 1 to 3, wherein the forced sinking buoyancy body has a water drainage member that discharges seawater from within the float to the outside when the oil fence floats up.

5. the mooring arrangement includes a platform on which an oil boom operating device is located; The air supply and exhaust hose has one hose end connected to the oil fence operation device and the other hose end connected to the float via an air supply and exhaust hose connection pipe, An oil fence device as described in any one of claims 1 to 4, wherein the oil fence operating device controls the supply and exhaust of the float through the supply and exhaust hose and the supply and exhaust hose connecting pipe.

Images