JPH088958Y2 - Horizontal bulkhead tanker - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is a ballast tank in which the ship side is doubled and a cargo oil tank provided between the ballast tanks is divided into an upper tank and a lower tank by a horizontal partition wall. It relates to a horizontal bulkhead tanker.

[Prior Art] If a hull is damaged by an accident such as a tanker that transports cargo oil colliding with another ship or runs aground while navigating, if cargo oil leaks out of the hull, the problem of marine pollution occurs. Becomes Therefore, measures have been taken to prevent the problem of marine pollution by suppressing the outflow of cargo oil from the cargo oil tank even if the hull is damaged by grounding, etc.
As an example, as shown in FIG. 2, the ship side is doubled to form a ballast tank 1, and the cargo oil tank 2 provided between the ballast tanks 1 is used as a minimum when loading cargo (cargo oil 4 or the like). The upper and lower tanks 2a and 2b are divided into upper and lower parts by a horizontal partition wall 3 at a height position below the waterline, and the lower part of the cargo oil tank 2 is divided into an upper tank 2a and a lower tank 2b. A trunk 6 is installed so as to reach the upper deck 5 from the tank 2a, and the trunk 6 of the upper deck 5 is
A horizontal partition tanker having a structure in which a vent pipe 9 and an inert gas pipe 10 for the lower tank 2b are separately connected to the vent pipe 7 and the inert gas pipe 8 on the upper tank 2a side at a position corresponding to .

According to such a horizontal partition tanker, the packing oil 4 is loaded in the lower tank 2b so that the packing oil level is in a state where a small space is generated in the lower part of the horizontal partition 3 even if a breakage occurs in the bottom of the ship. If so, seawater enters the lower tank 2b through the rupture and pushes the cargo oil 4 up, so that it is possible to prevent the cargo oil 4 from flowing out of the lower tank 2b, while the lower tank 2b is blocked.
When the cargo oil 4 inside is loaded up to the upper part of the trunk 6 that is installed up to the upper deck 5, the cargo oil 4 flows out to the outside of the ship to a level where the pressure at the bottom of the ship is balanced. Since the amount is limited to the cargo oil 4 in the trunk 6, it can be kept minute.

[Problems to be solved by the invention] However, in the case of the horizontal bulkhead tanker, since the cargo oil tank 2 is divided into the upper tank 2a and the lower tank 2b, the vent pipe and the inert gas pipe are connected to the upper tank 2a and the lower tank.
Since it is necessary to equip each of the lower tanks 2b with each other, there is a problem that the cost becomes high. Moreover, when the cargo oil 4 is piled up above the position of the horizontal partition wall 3 in the lower tank 2b, the upper space of the lower tank 2b is increased. Since it is regulated by the volume of the trunk 6 and becomes extremely small, the pressure fluctuation due to temperature change and swaying of the hull becomes very large. Therefore, it is necessary to frequently discharge gas or inject inert gas, There is a problem that these operations become complicated.

Therefore, the present invention makes it possible to use the vent pipe and the inert gas pipe for both the upper tank and the lower tank.
It is intended to mitigate pressure fluctuations in the upper space of the lower tank due to temperature changes and hull motions.

[Means for Solving the Problems] In order to solve the above problems, the present invention uses a ballast tank on the ship side, and a cargo oil tank provided between them is divided into an upper tank and a lower tank by a horizontal partition. In a horizontal partition tanker having a compartment formed and a trunk extending from the lower tank to the upper deck, an opening for communicating the inside of the upper tank with the inside of the lower tank is provided in the upper portion of the trunk, and A vent pipe and an inert gas pipe, which are shared by the upper tank and the lower tank, are connected to the upper deck at a position corresponding to the upper tank.

[Operation] Since the inside of the upper tank and the inside of the lower tank communicate with each other through the opening provided in the upper part of the trunk, the vent pipe connected to the upper tank side can be used for the gas release and inert gas injection work on the lower tank side. It can be performed using an inert gas pipe. Further, since the gas in the upper space of the upper tank can flow between the upper space of the upper tank and the upper space of the tank by the opening, fluctuations in pressure are reduced.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. As in the horizontal bulkhead tanker shown in FIG.
And a cargo oil tank 2 provided between the ballast tanks 1 is divided into an upper tank 2a and a lower tank 2b by a horizontal partition wall 3 and divided into upper and lower tanks 2a and 2b, and a trunk from the lower tank 2b to the upper deck 5 is formed. In the structure where 6 is installed,
The upper part of the trunk 6 is provided with an opening 13 for communicating the inside of the upper tank 2a with the inside of the lower tank 2b. Further, the upper tank 2a side and the lower tank 2a are provided at positions corresponding to the upper tank 2a of the upper deck 5. A configuration is provided in which a vent pipe 11 and an inert gas pipe 12 that are commonly used on the 2b side are connected and equipped.

When injecting inert gas into the cargo oil tank 2,
The inert gas is injected through the inert gas pipe 12 connected to the upper tank 2a. In this case, the inert gas supplied from the inert gas pipe 12 is
2a is filled, but at this time, since the opening 13 is provided in the upper part of the trunk 6, the excess inert gas will pass through the opening 13 and be supplied into the lower tank 2b. As a result, the lower tank 2b is also filled with inert gas. Further, when the gas in the upper tank 2a is released to the atmosphere, the gas is released through the vent pipe 11, but the gas in the lower tank 2b also once flows into the upper tank 2a through the opening 13. After that, it is similarly released to the atmosphere through the vent pipe 11. Therefore, the vent pipe 11 and the inert gas pipe 12 can be shared by the upper tank 2a and the lower tank 2b, whereby the vent pipe and the inert gas pipe conventionally equipped on the lower tank 2b side can be omitted. .

In the above, when the temperature changes or the hull sways, the upper space of the upper tank 2a, that is, the inside of the trunk 6 receives a compressive force or an expansive force. Are communicated with each other through the opening 13, and the gas in the trunk 6 can freely flow between the upper tank 2a and the opening 13 so that the pressure fluctuation can be reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the horizontal bulkhead tanker of the present invention, the upper part of the trunk that is installed from the lower tank to the upper deck is provided with the opening for communicating the inside of the upper tank with the inside of the lower tank. Moreover, since the vent pipe and the inert gas pipe are connected only to the upper tank side, the vent gas and the inert gas pipe on the upper tank side are also used for the gas release and the inert gas injection work on the lower tank side through the opening. Therefore, the vent pipe and the inert gas pipe dedicated to the lower tank side can be omitted, and the cost can be reduced, and even if the temperature changes or the hull sways, the lower tank Since the gas in the upper space of the tank can freely flow to the upper tank through the opening, it is possible to reduce the pressure fluctuation in the upper space of the upper tank, and It is possible to reduce the amount of gas released by the heating tube and the operation of injecting the inert gas through the inert gas tube.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a horizontal partition tanker of the present invention, and FIG. 2 is a schematic sectional view showing an example of a recently proposed horizontal partition tanker. 1 ... Ballast tank, 2 ... Cargo oil tank, 2a ... Upper tank, 2b ... Lower tank, 3 ... Horizontal bulkhead, 5 ... Upper deck, 6 ... Trunk, 11 ... Vent pipe, 12 ... … Inert gas pipe, 13… Open hole.

Claims (1)

[Scope of utility model registration request] 1. A ballast tank is provided on the ship side, and a cargo oil tank provided therebetween is divided into an upper tank and a lower tank by a horizontal partition wall to form an upper tank and a lower tank, and a trunk is installed from the lower tank to the upper deck. In the horizontal bulkhead tanker provided, an opening is provided in the upper part of the trunk for communicating the inside of the upper tank with the inside of the lower tank, and further, the upper tank and the lower tank are provided at a position corresponding to the upper tank of the upper deck. A horizontal partition tanker characterized by connecting a vent pipe and an inert gas pipe which are also used for and.