JPH0649295U - Flexible porous sheet laying type tanker - Google Patents

Abstract

(57) [Summary] [Objective] The present invention lays a flexible perforated sheet so that if a breakage occurs at the bottom of a ship due to a grounding or the like, the oil will not flow out through the breakage even under strong tidal current conditions. It provides a tanker. [Structure] The tank space inside the ship is partitioned by an intermediate partition wall 2 into an upper cargo oil tank 3 and a lower cargo oil tank 4, and a flexible porous sheet 6 such as a wire mesh is formed on the bottom surface of the lower cargo oil tank 4.
Was laid. Due to the presence of the intermediate partition wall 2, the hydraulic pressure applied to the bottom plate 5 of the ship is reduced, and even if a breakage occurs in the bottom plate 5, the flexible porous sheet 6 covers the breakage. Will not be transmitted to the oil and the leakage of oil will be suppressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tanker capable of preventing the outflow of freight oil as much as possible when the bottom of a ship is damaged.

[0002]

[Prior art]

 Conventionally, a tanker for transporting crude oil has been developed, as shown in Fig. 3, in which the tank inside the hull 1 is divided into an upper oil tank 3 and a lower oil tank 4 by an intermediate partition wall 2. Since the intermediate partition wall 2 is set to be lower than the sea level 8 in the fully loaded state, when a breakage occurs in the ship bottom skin 5 due to a grounding or the like, the hydraulic pressure is higher than the hydraulic pressure from above at the breakage. The outflow of freight oil is controlled by the seawater pressure from below.

[0003]

[Problems to be solved by the device]

 By the way, even in the conventional tanker as described above, when the surrounding outer tidal current is strong, if a breakage occurs in the bottom plate 5 of the ship, the movement of seawater will be transmitted to the lower cargo oil tank through the breakage. Along with this, the movement of the oil in the lower oil tank causes the oil to leak. In the present invention, when a breakage occurs in the bottom plate of the ship bottom, the flexible perforated sheet prevents the movement of seawater from being transmitted to the lower oil tank through the breakage. An object of the present invention is to provide a flexible porous sheet laying type tanker capable of preventing oil from leaking out.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the flexible perforated sheet laying type tanker of the present invention is a tanker in which the tank space inside the ship is divided into an upper oil tank and a lower oil tank by an intermediate partition wall. A feature is that a flexible porous sheet is laid on the bottom surface of the lower currency oil tank.

[0005]

[Action]

 With the flexible perforated sheet laying tanker of the present invention described above, even if the bottom part of the lower cargo oil tank is damaged and ruptures at the time of grounding, the flexibility such as a wire mesh laid on the bottom of the tank is flexible. The perforated sheet comes to cover the rupture while being deformed to some extent. Therefore, even under strong tide conditions, the motion of seawater flowing around the breach is significantly attenuated by the flexible perforated sheet, so that the motion of seawater is not transmitted to the oil through the breach. This will prevent the oil from leaking out of the breach.

[0006]

【Example】

 A flexible perforated sheet laying type tanker as an embodiment of the present invention will be described below with reference to the drawings. Fig. 1 is a lateral cross-sectional view of the hull, and Fig. 2 is a cross-sectional view showing a ship bottom breakage at the time of grounding. is there.

As shown in FIG. 1, the tank space inside the hull 1 is partitioned by an intermediate partition wall 2 into an upper currency oil tank 3 and a lower currency oil tank 4, and the positions of the intermediate partition walls 2 are as follows. It is set to be slightly lower than the sea level 8 when the cargo oil tanks 3 and 4 are fully loaded with cargo oil. A wire mesh 6 as a flexible porous sheet is laid on the bottom surface of the lower currency oil tank 4. In addition, ballast tanks 1a, 1a capable of injecting and discharging seawater are provided on both sides of this tanker.

With the above configuration, when the obstacle 7 pierces the bottom plate 5 of the bottom of the ship and the breakage port 9 is formed at the bottom of the lower oil tank 4, the lower oil tank 4 moves the upper part to the middle. Since it is partitioned by the partition wall 2, the hydraulic pressure from above in the breach 9 is lower than the seawater pressure from below, which prevents the oil from flowing out through the breach 9 when the tidal current is not strong. be able to. Further, even if a strong tidal current is flowing around, the presence of the wire net 6 prevents the outflow of the freight oil as follows. That is, when the break 9 is formed in the bottom plate 5, the wire net 6 covers the break 9 in a state of being deformed to some extent. Because of the porous shape of the wire net 6, the wire net portion 6a in the vicinity of the breach 9 is not hindered by the head pressure from above and is only pushed up by the obstacle 7 even when the rupture 9 is suddenly formed. Therefore, the wire net 6 itself does not cause a large break.

Therefore, even under a strong tidal current, the movement of the seawater flowing around the breach 9 of the bottom plate 5 of the ship is significantly attenuated by the wire mesh portion 6a covering the breach 9, so that the seawater can be passed through the breach 9. Is not transmitted to the currency oil in the lower currency oil tank 4, and the oil pressure applied to the bottom of the lower currency oil tank 4 by the intermediate partition wall 2 is low. Oil leakage is greatly suppressed. The mesh of the wire net 6 may be about several mm, but may be a mesh of 2 to 3 cm in order to avoid clogging due to impurities in the oil. In addition, a material other than metal may be used as the material.

[0010]

[Effect of device]

 As described above in detail, according to the flexible perforated sheet laying type tanker of the present invention, the tank space inside the ship is divided into the upper and lower freight oil tanks by the intermediate partition wall and the lower freight oil tank. With a simple structure in which a flexible porous sheet is laid on the bottom of the tank, the effect of significantly suppressing the outflow of currency oil even if the tidal current causes strong breakage in the bottom of the ship There is.

[Brief description of drawings]

FIG. 1 is a horizontal cross-sectional view of a hull showing a flexible porous sheet laying type tanker according to an embodiment of the present invention.

2 is a cross-sectional view of the vicinity of the ship bottom breakage when the tanker of FIG. 1 is aground.

FIG. 3 is a cross-sectional view of a hull showing a conventional tanker.

[Explanation of symbols]

 1 Hull 1a Ballast tank 2 Intermediate partition wall 3 Upper cargo oil tank 4 Lower cargo oil tank 5 Ship bottom outer plate 6 Wire mesh as a flexible porous sheet 6a Wire mesh part near the break 7 Obstacle 8 Sea surface 9 Break

Claims (1)

[Scope of utility model registration request] 1. In a tanker in which a tank space in a ship is partitioned into an upper cargo oil tank and a lower cargo oil tank by an intermediate partition wall, a flexible porous sheet is laid on the bottom surface of the lower cargo oil tank. Characteristically, a flexible porous sheet laying tanker.