JPH06312686A - Cargo oil tank supply structure for tanker - Google Patents

Abstract

PURPOSE:To provide an air supply structure for supplying outside air and inert gas into a lower cargo oil tank by providing a ballast tank with an outside air and inert gas introducing means, and disposing a valve for supplying outside air and insert gas to an upper cargo oil tank and a lower cargo oil tank on a longitudinal bulkhead plate for partitioning the ballast tank. CONSTITUTION:A double deck type tanker 1a comprises a cargo oil tank 4 divided into an upper cargo oil tank 4a and a lower cargo oil tank 4b by a horizontal dividing wall 12 which connects longitudinal bulkhead plates 3 to each other at a height near a draft line substantially parallel to an upper deck 2. The tanker 1a includes ballast tanks 6 which are adjacent to both outsides in the side direction of the cargo oil tank 4 and formed between the longitudinal bulkhead plates 3 and the ship side outer plates 5. Further, an outside air and inert gas introducing means 18 for introducing outside air and inert gas into the supply side ballast tank 6a is provided and the longitudinal bulkhead plate 3 is provided with outside air and inert gas supply valves 15a, 15b for supplying outside air and inert gas into the upper cargo oil tank 4a and the lower cargo oil tank 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tanker oil tank tank air supply method, and more particularly to a tanker tank oil tank tank air supply structure having a ballast tank adjacent to the tank oil tank.

[0002]

2. Description of the Related Art As shown in FIG. 4, generally as a tanker 1, a vertical partition plate 3 is provided by connecting a ship outer plate 7 to a ship outer plate 2 at predetermined intervals inside both ship side plate 5 respectively. And the cargo tank 4 partitioned by the vertical bulkhead plate 3, the upper deck 2 and the bottom shell plate 7, and adjacent to both outer sides of the cargo oil tank 4 in the port direction, and the vertical bulkhead plate 3 and the shipboard outer plate. 5
It is known to have a ballast tank 6 formed between each of the two. The ballast tank 6 is filled with seawater in a predetermined amount according to the amount of heavy oil such as heavy oil stored in the oil tank 4, and the ship itself is secured with appropriate weight to ensure the stability of the hull. To do. The upper portions of the currency oil tank 4 and the ballast tank 6 are partitioned by the upper deck 2, and the lower portions thereof are partitioned by the bottom shell plate 7. Further, as shown in FIG. 5, a plurality of horizontal bulkheads 3a that partition the freight oil tank 4 and the ballast tank 6 in the ship axis direction and extend over the port side are provided, whereby the tanker 1 has a plurality of freight oil tanks 4 and ballast tanks. Will have 6. This type of tanker 1 is generally widely known as a single deck type.

[0006] By the way, although the freight oil such as heavy oil is stored in these freight oil tanks 4, when the freight oil is unloaded from the freight oil tank 4, the work of checking the freight oil tank 4 is performed. Therefore, a worker needs to enter the freight oil tank 4, but since the oil gas, which is a gas component of freight oil, remains in the freight oil tank 4, the work cannot be performed as it is.
Therefore, this oil gas is first expelled from the currency oil tank 4 to the outside by inert gas which is an inert gas,
Furthermore, gas-free by replacing with external air is performed.

Due to this gas-free operation, the upper deck 2 on the currency oil tank 4 has an air supply hole 8 for introducing outside air and inert gas, and an exhaust hole 9 for exhausting the internal oil gas to the outside. They are provided respectively. The air supply hole 8 and the exhaust hole 9 are provided with an opening / closing lid 10 when the cargo oil tank 4 is loaded.
Is fixed and closed, and on the other hand, when the gas is free, the opening / closing lid 10 is removed and released, and the air supply fan 11 for sending outside air and inert gas is placed on the air supply hole 8. Therefore, by the air supply fan 11, the oil tank 4
The outside air and the inert gas are sent into the inside, and the oil gas or the inert gas in the inside is extruded into the outside air and discharged to the outside through the exhaust hole 9.

[0005]

SUMMARY OF THE INVENTION By the way, the present applicant has already disclosed in Japanese Patent Application No. 51-113997 that a horizontal partition wall is provided in a freight oil tank substantially parallel to the upper deck and at a height near the water line. Provided is a tanker in which a freight oil tank is divided into upper and lower stages. By forming this horizontal partition to divide the freight oil tank into an upper freight oil tank and a lower freight oil tank, it is possible to keep the outflow of freight oil to a minimum even if the bottom of the ship is damaged due to an accident such as grounding. Due to its advantages, this so-called double-deck type tanker has been embodied in recent years.

As shown in FIG. 6, such a tanker 1
In the case a, the horizontal partition wall 12 described above is formed in the freight oil tank 4 of the single-deck type tanker 1 described above, and the freight oil tank 4 is divided into an upper freight oil tank 4a and a lower freight oil tank 4b. It is formed. On the other hand, the ballast tank 6 is formed adjacent to the outer sides of the upper and lower freight oil tanks 4a and 4b in the port direction, but no horizontal partition wall 12 is formed in the ballast tank 6. Only the freight oil tank 4 will be vertically partitioned. Further, as with the single-deck type tanker 1, a plurality of horizontal bulkheads 3a are provided in the axial direction of the ship so as to partition the upper cargo oil tank 4a, the lower cargo oil tank 4b, and the ballast tank 6 and to extend over the shipboard side. It will have a plurality of currency oil tanks 4 and ballast tanks 6.

By the way, in the gas-free operation of the upper currency oil tank 4a and the lower currency oil tank 4b divided by the horizontal partition wall 12, the upper currency oil tank 4a can be gas-free by the method described above. However, a gas-free method of the lower currency oil tank 4b becomes a problem, and a suitable method is desired.

Further, in the plurality of freight oil tanks 4, since the freight oil is loaded and unloaded, the freight oil tanks 4 are divided into the above two upper and lower tiers. It is desirable that the gas-free method can be performed individually for each of the currency oil tanks 4.

Therefore, an object of the present invention is to solve the above problems and to provide a suitable air supply structure for supplying the outside air and the inert gas as an inert gas to the inside of the lower oil tank when the gas tank is free of gas. To provide.

[0010]

In order to achieve the above-mentioned object, the present invention provides a vertical partition wall plate by connecting a ship bottom shell plate to a ship bottom shell plate at a predetermined distance inside each of the ship side shell plates, A tanker formed by forming a cargo oil tank partitioned by a vertical bulkhead plate, an upper deck, and a ship bottom outer plate, and forming ballast tanks between the vertical bulkhead plate and the shipboard side outer plate, respectively. It is positioned substantially parallel to the upper deck and at a height near the waterline, and the two vertical partition plates are connected to each other to provide a horizontal partition wall, which is divided into an upper tank and a lower tank, and one of them is formed. Located on the side of the ship's side of the ship, equipped with an outside air and inert gas introduction means for introducing outside air and inert gas into the ballast tank, and upper freight oil on the vertical partition wall partitioning the ballast tank into which the outside air and inert gas are introduced. Tank and lower cargo oil tank Respectively to the click it is provided with a fresh air and an inert gas supply valve for supplying fresh air and an inert gas.

[0011]

According to the above construction, the horizontal partition wall is provided and the upper and lower oil tanks are separated from each other, so that even if the bottom portion of the lower oil tank is damaged, leakage of oil to the outside is prevented. At the same time, the outside air and the inert gas are introduced into the ballast tank from the outside air and the inert gas introduction means, and the outside air and the inert gas introduced into the ballast tank are transferred to the upper coin through the outside air and the inert gas supply valve. Gas free can be achieved by supplying to the oil tank and the lower currency oil tank respectively.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1, in a double deck type tanker 1a, a vertical partition plate 3 is formed by connecting an upper deck 2 and a bottom outer panel 7 to the insides of both vessel side outer panels 5 at predetermined intervals. Is provided and is partitioned by the vertical bulkhead plate 3, the upper deck 2 and the ship bottom outer plate 7, and is positioned substantially parallel to the upper deck 2 and at a height near the water line and both vertical bulkhead plates 3 are provided.
It has a currency oil tank 4 which is divided into an upper currency oil tank 4a and a lower currency oil tank 4b by a horizontal partition wall 12 provided by connecting them. Since the currency oil tank 4 is divided into an upper currency oil tank 4a and a lower currency oil tank 4b by a horizontal partition 12 provided at a height near the waterline, the bottom of the lower currency oil tank 4b is That is, even if the bottom plate 7 of the ship is damaged, it is possible to prevent the leakage of the oil from the outside.

Further, the tanker 1a has ballast tanks 6 which are adjacent to both outer sides of the freight oil tank 4 in the port side and are respectively formed between the vertical partition plate 3 and the port side outer plate 5. The ballast tank 6 is filled with a predetermined amount of seawater in accordance with the amount of heavy oil such as heavy oil contained in the oil tank 4, and the ship itself is given an appropriate weight to ensure the stability of the hull. It is a thing. The horizontal partition 12 is not formed in the ballast tank 6, and only the currency oil tank 4 is vertically divided. The upper parts of the upper currency oil tank 4a and the ballast tank 6 are partitioned by the upper deck 2, and the lower currency oil tank 4b and the ballast tank 6 are
And their lower parts are partitioned by the bottom shell plate 7.
Further, as shown in FIG. 5, similarly to the single-deck type tanker 1, a plurality of horizontal bulkheads 3a are provided in the vessel axis direction so as to partition the freight oil tank 4 and the ballast tank 6 and to extend over the port side. As a result, the tanker 1a has a plurality of freight oil tanks 4 partitioned in the upper and lower two stages and in the vessel axial direction, and is adjacent to both outer sides in the port direction of the two upper and lower freight oil tanks 4 and in the vessel axial direction. Will have a plurality of ballast tanks 6.

Further, the ballast tanks 6 adjacent to both sides of the freight oil tank 4 on the port side are provided with a supply for the ballast tank 6 located on one of the port sides to supply outside air and inert gas as an inert gas. It is used as the air side ballast tank 6a. This air supply side ballast tank 6
The outside air and the inert gas introducing means 18 for introducing the outside air and the inert gas are provided in a, and the outside air and the inert gas introducing means 18 include the outside air and the inert gas provided on the upper deck 2 above the air supply side ballast tank 6a. And an air supply fan 11 for sending outside air and inert gas into the air supply side ballast tank 6a. Further, the vertical partition wall plate 3 for partitioning the air supply side ballast tank 6a into which the outside air and the inert gas are introduced has an outside air and an inert gas for supplying the outside air and the inert gas to the upper and lower currency oil tanks 4a and 4b, respectively. Gas supply valves 15a and 15b are provided. Further, the air supply pipes 14a and 14b which are passages for substantially the outside air and the inert gas to the upper oil tank 4a or the lower oil tank 4b.
Are provided so as to penetrate the vertical partition plate 3, and the outside air and inert gas supply valves 15a and 15b are provided near the inlets of the air supply pipes 14a and 14b in the air supply side ballast tank 6a. Open and close. When the air supply side ballast tank 6a is filled with seawater, the air supply hole 8 is closed by the opening / closing lid 10.

On the other hand, an exhaust pipe 16b for exhausting the oil gas in the lower currency oil tank 4b to the outside is vertically inserted into the remaining one tank of the ballast tank 6, and the exhaust pipe 16 has one end portion. In the ballast tank 6, the bent vertical partition plate 3 is penetrated, and the lower end of the oil tank 4b is provided. Further, an exhaust valve 17b for opening and closing the exhaust pipe 16 is provided at a portion of the exhaust pipe 16 which projects into the lower currency oil tank 4b. Further, an exhaust hole 9 for exhausting the oil gas in the upper currency oil tank 4a is provided in the upper deck 2 above the upper currency oil tank 4a.

The air supply hole 8 and the air exhaust hole 9 are provided with an opening / closing lid 10 when the air supply side ballast tank 6a is filled with seawater as a ballast or when the upper freight oil tank 4a is loaded with freight oil. Is fixed and closed, and on the other hand, when the gas is free, the opening / closing lid 10 is removed and released, and the air supply fan 11 for sending outside air and inert gas is placed on the air supply hole 8.

Next, the operation of this embodiment will be described.

When the freight oil is unloaded from the freight oil tank 4, the freight oil tank 4 is gas-free. At this time, the tanker 1a is in a ship-stop state and the ballast tank 6 All seawater is discharged to the outside, and the ballast tank 6 is empty.

Therefore, when the lower currency oil tank 4b is gas-free, the opening / closing lid 10 fixed to the air supply hole 8 is removed to release the air supply hole 8, and the air supply fan 11 is placed on it. Further, the outside air and inert gas supply valve 15b and the exhaust valve 17b are opened and the air supply fan 11 is started. Then, outside air or inert gas is introduced into the air supply side ballast tank 6b by the air supply fan 11 and circulates,
The air gas is sent from the air supply pipe 14b into the lower currency oil tank 4b, the oil gas in the lower currency oil tank 4b is extruded by the outside air or the inert gas, and is exhausted to the outside through the exhaust pipe 16b.

Further, when the upper currency oil tank 4a is gas-free, the outside air and the inert gas supply valve 14a are opened,
Remove the opening / closing lid 10 to release the exhaust hole 9, and open the air supply fan 1
When the outside air or the inert gas is sent to the air supply side ballast tank 6a by 1, the oil gas or the inert gas in the upper currency oil tank 4a is discharged to the outside similarly to the above.

As described above, since one ballast tank 6 is used as a distribution route for the outside air as fresh air and the inert gas, the lower freight oil tank 4b can be gas-free and the lower freight oil tank 4b There is no need to install a new air supply route to the tanker 1
It can contribute to the reduction of the manufacturing cost of a. Further, with the above configuration, it is possible to perform gas-free operation for each of the freight oil tanks 4 which are divided into upper and lower stages.

The outside air and inert gas supply valves 15a, 1
5b are located on the bottom wall 20 of the upper and lower cargo oil tanks 4a and 4b, respectively, and provided on the vertical partition plate 3, outside air and inert gas are supplied along the bottom surface 20. The circulation of the oil gas and the inert gas in the oil tank 4a and the lower freight oil tank 4b is strengthened, and gas free can be performed in a short time.

The outside air and inert gas supply valves 15a, 1
Even if a plurality of 5b's are provided, respectively, the supply amounts of the outside air and the inert gas are increased, and the gas can be similarly freed in a short time.

Further, as in the air supply method, a method in which oil gas is circulated in the other ballast tank 6 and exhausted is also conceivable. However, if this oil gas is circulated in the ballast tank 6, there is a problem that the inside of the ballast tank 6 is contaminated. Therefore, in the present embodiment, the exhaust pipe 16b is provided in one of the ballast tanks 6. Has been inserted.

Next, a modified embodiment of the present invention will be described.

As shown in FIG. 2, in the first modified embodiment, the exhaust pipe 16b rises straight above the lower oil tank 4b, penetrates the horizontal partition wall 12 and is located in the upper oil tank 4a. It is provided so as to project over the upper deck 2 after passing through. As for the method of supplying the outside air and the inert gas, one ballast tank 6 is used as in the above embodiment. In the first modified embodiment, the same effect as the above embodiment can be expected.

Further, as shown in FIG. 3, in the second modified embodiment, the horizontal partition wall 12 is provided with a communicating means 19 for communicating the upper currency oil tank 4a and the lower currency oil tank 4b. The communication means 19 may be one that opens and closes using a valve or a hole that is opened or closed by an opening / closing lid as appropriate. By forming the communication means 19 (a valve is used in the illustrated example), the oil gas and the inert gas in the lower currency oil tank 4b pass through the upper currency oil tank 4a and are exhausted to the outside from the exhaust hole 9. It will be. In the case of the second modified example, when the gas free of the upper currency oil tank 4a is completed and then the gas free of the lower currency oil tank 4b is performed, the inside of the upper currency oil tank 4a which has been completely gas-free will be contaminated again. Therefore, the upper freight oil tank 4a and the lower freight oil tank 4b are gas-free at the same time.

As described above, since the ballast tank 6 on one side is used as a distribution route for the outside air as fresh air and the inert gas, the lower oil tank 4
In addition to enabling the gas-free in b, it is possible to perform the gas-free for each of the coin oil tanks 4 which are divided into upper and lower stages. Further, it is not necessary to newly provide an air supply route into the lower currency oil tank 4b, which can contribute to the reduction of the manufacturing cost of the tanker 1a. Furthermore, a horizontal bulkhead is provided in the oil tank 4 of the existing single-deck type tanker 1,
Even when the tanker 1a of the double-deck type is modified, it also has the advantage that it is not necessary to make a particularly large modification for performing gas-free.

[0030]

The present invention exhibits the following excellent effects.

(1) When the gas oil tank is free of gas, it is possible to simplify the device for supplying the outside air and the inert gas as the inert gas into the upper and lower oil tanks by using the ballast tank. Can be achieved.

(2) Gas free can be performed for each of the oil tanks.

(3) It can contribute to the reduction of tanker manufacturing costs.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a tanker oil tank air supply structure according to the present invention.

FIG. 2 is a side sectional view showing a modified example of a tanker tank oil tank air supply structure according to the present invention.

FIG. 3 is a side sectional view showing a modified embodiment of the tanker oil tank tank air supply structure according to the present invention.

FIG. 4 is a side sectional view showing a conventional example.

FIG. 5 is a side sectional view showing a conventional example.

FIG. 6 is a side sectional view showing a double-deck type tanker.

[Explanation of symbols]

 1a Tanker 2 Upper deck 3 Vertical bulkhead plate 4 Cargo oil tank 4a Upper cargo oil tank 4b Lower cargo oil tank 5 Shipboard side outer plate 6 Ballast tank 12 Horizontal bulkhead 15a, 15b Outside air and inert gas supply valve 18 Outside air and inert gas Introduction means

Claims (1)

[Claims] 1. A vertical partition wall plate is provided by connecting a ship bottom shell plate from an upper deck at a predetermined distance inside each of the shipboard side shell plates, and is partitioned by the vertical partition wall plate, the upper deck and the ship bottom shell plate. A tanker which is formed by forming a cargo oil tank and a ballast tank between the vertical bulkhead plate and the shipboard side plate, respectively, in the above-mentioned cargo oil tank substantially parallel to the upper deck and near the water line. The vertical bulkhead plates are connected to each other to form a horizontal bulkhead to partition the upper and lower cargo oil tanks into compartments. In addition to providing outside air and inert gas introduction means for introducing active gas, the vertical partition wall partitioning the ballast tank into which the outside air and inert gas are introduced has an upper atmosphere and a lower currency oil tank, respectively. Gas supply A tanker tank oil tank air supply structure characterized by being provided with an outside air and an inert gas supply valve for use in the tanker.