JPH0463789A - Cargo oil outflow prevention type tanker with overflow means - Google Patents

Abstract

PURPOSE:To appropriately deal with overflow oil from a lower tank and prevent abnormal pressure rise in the lower tank by providing a flow passage for overflow oil which is connected to the upper part of the lower tank and extended over a bulkhead between the upper and lower tanks, for absorbing overflow oil from the lower tank. CONSTITUTION:A hull is partitioned with longitudinal bulkheads (a) so as to contact both sides with broadside tanks 9, and a plurality of inboard tanks for loading cargo oil mutually partitioned with transverse bulkheads under an upper deck 10 are respectively partitioned with bulkheads 11 into lower tanks l and upper tanks 2. In this case, for absorbing overflow oil from the lower tank l, an overflow pipe 3 and an overflow trunk 4 are connected to the upper part of the lower tank l and extended over the bulkhead 11. Overflow oil introduced to the overflow pipe 3 is transferred to the upper tank 2 through an overflow transferring pipe 5. Overflow oil introduced to the overflow trunk 4 is also transferred to the upper tank 2 through a valve 6 and the overflow transferring pipe 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tanker capable of preventing the spillage of cargo oil, and particularly to a tanker equipped with overflow means capable of disposing of overflowing oil in the event of an accident.

[Conventional technology]

Conventionally, there has been no oil spill prevention type tanker in which an inboard tank is partitioned into an upper tank and a lower tank by a bulkhead, which is equipped with a means for disposing of overflowing oil from the lower tank.

[Problem to be solved by the invention]

In the event that a hole is created in the bottom of the ship due to a tanker running aground, etc., in order to prevent cargo oil from flowing out from the ship's tank through the hole, it is necessary to divide the ship's tank into an upper tank and a lower tank with a bulkhead. It is said to be effective.

However, damage to the lower tank due to ship sway, deformation of the cargo oil tank, changes in the oil level of the lower tank due to an imbalance between the cargo oil tank volume and the amount of stored cargo oil due to temperature changes, and grounding accidents, collisions, etc. When the oil level changes due to the effects of stagnant water, if the oil overflow from the lower tank is not properly disposed of, the internal pressure of the lower tank may rise abnormally, or cargo oil may leak out from a hole when the ship's bottom is damaged. may lead to

The present invention aims to solve such problems, and aims to provide a cargo oil spill prevention type tanker with an overflow means that can appropriately dispose of oil overflow from the lower tank. shall be.

[Means to solve the problem]

In order to achieve the above-mentioned object, the cargo oil spill prevention type tanker with overflow means of the present invention is a cargo oil spill prevention type tanker in which an inboard tank is partitioned into an upper tank and a lower tank by a partition wall. The present invention is characterized in that an overflow channel is provided which is connected to the upper part of the lower tank and extends above the partition wall to absorb overflowing oil.

[For production]

In the oil spill prevention type tanker with overflow means of the present invention described above, when the oil level in the lower tank rises when the ship shakes due to waves or the lower tank deforms, or when the ship crashes, etc. The overflowing oil passes through the overflow channel and is guided above the partition wall that serves as the top wall of the lower tank.

[Embodiment] Hereinafter, a cargo oil spill prevention type tanker with overflow means as one of the flow sides of the present invention will be explained with reference to the drawings. Fig. 1 is a sectional view of the hull thereof.

As shown in Fig. 1, the lower part of the upper deck 10 is partitioned on both sides by vertical bulkheads a, a so as to be in contact with side tanks 9, 9 serving as left and right water ballast tanks, and is also partitioned from each other by horizontal bulkheads (not shown). A plurality of inboard tanks for loading cargo oil are each partitioned into a lower tank 1 and an upper tank 2 by a bulkhead 11.

And, in order to absorb the overflowing oil from the lower tank 1,
An overflow pipe 3 and an overflow trunk 4 as an overflow channel connected to the upper part of the lower tank 1 extend above the partition wall 11.

The overflowing oil led to the overflow pipe 3 is transferred to the upper tank 2 through the overflow transfer pipe 5, and the overflowing oil led to the overflow trunk 4 is also transferred to the upper tank 2 through the valve 6 and the overflow transfer pipe 5. It is designed to be transferred to tank 2.

With the above configuration, the cargo oil loaded in the lower tank 1 is
When oil overflows due to the movement of the ship, deformation of the lower tank 1 due to external forces, or temperature changes, this overflow will flow through the overflow pipe 3 or the overflow pipe 3 or over 70 - trunk 4 and valve 6.
is transferred to the upper tank 2 via the over 70-transfer pipe 5. Therefore, an abnormal increase in the internal pressure of the lower tank 1 will not occur.

If a hole 8 is formed at the bottom of the lower tank 1 due to a grounding or collision of the ship, the lower tank 1 may be damaged through the hole 8 due to the difference in specific gravity between the cargo oil and seawater or the influence of the stagnant water surface 7.
This causes seawater to flow into the upper tank 1, and the resulting overflow from the tank 1 is transferred to the upper tank 2 through the same route as described above. Therefore, a layer of seawater is formed in the bottom of the lower tank 1, which has flowed into the tank 1 through the hole 8 in response to the overflow of oil, thereby preventing cargo oil from flowing out of the ship.

Note that the overflow pipe 3 can also serve as a vent pipe, and the overflow trunk 4 can also serve as an access trunk.

〔Effect of the invention〕

As described above in detail, the cargo oil spill prevention type tanker with overflow means of the present invention provides the following effects and advantages.

(1) Overflowing oil from the lower tank due to the movement of the ship or the deformation of the lower tank is appropriately handled by the overflow channel, and an abnormal increase in the internal pressure of the lower tank can be prevented.

(2) Even if a hole occurs due to damage to the lower tank, the overflow channel will dispose of the overflowing oil, and a layer of seawater that has flowed in through the hole will form at the bottom of the lower tank. It is possible to prevent cargo oil from flowing out through the hole.

(3) Oil overflow from the lower tank can be automatically performed through the overflow channel.

(4) The overflow channel can also serve as a vent pipe or an access trunk.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a cargo oil spill prevention type tanker with overflow means as an embodiment of the present invention. 1... Lower tank, 2... Upper tank, 3... Overflow pipe, 4... Over 70-trunk, 5
...Overflow transfer pipe, 6...Valve, 7...
・Water surface, 8...Break hole, 9...Side tank, 10・
...Upper deck, 11.. Bulkhead, a... Longitudinal bulkhead. Agent Patent Attorney Yoshihiko Iinuma

Claims (1)

[Claims] In a cargo oil spill prevention type tanker in which the inboard tank is divided into an upper tank and a lower tank by a bulkhead, a tank is connected to the upper part of the lower tank and extends above the bulkhead to absorb oil overflow from the lower tank. A cargo oil spill prevention type tanker with an overflow means, characterized in that it is provided with an overflow channel.