JPH08113189A - Oil tanker of double hull structure - Google Patents

Abstract

PURPOSE: To let the cargo oil pipes be free from getting wet with oil, and thereby enhance the maintenability by providing a tunnel in the longer direction over the inner circumferential surface of an inner hull at the ship bottom of a double hull structure, and thereby disposing cargo oil pipes in the tunnel. CONSTITUTION: The oil tanker 1 is equipped with a cargo tank 2 provided at the center section in the width direction of a hull, and with cargo tanks 3 and 3 provided for both sides of the hull, and these ship bottom and side panels are formed into each double hull structure. A tunnel 8 is provided in the longer direction of the hull over the inner circumferential surface of the inner hull 9 of the double hull structure of a ship bottom for the cargo tank 2 at the center, and the tunnel 8 is interposed between bulkheads 6 and 6 separating the cargo tank 2 at the center from the cargo tank 3 at both sides. A plurality of cargo oil pipes 5 are then arranged in the tunnel 8 in the longer direction of the tunnel 8. As a result, the inside of the tunnel is turned out a space preventing oil from ingressing, and the cargo oil pipes and their accessories are prevented from getting wet with oil in the cargo tanks, so that maintenability is thereby excellent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil tanker having a double hull structure, and more particularly to a piping structure for a currency oil pipe in the above ship.

[0002]

2. Description of the Related Art In response to an oil spill incident due to a ship accident that occurred in recent years, the revision of the Marine Pollution Treaty concerning the tanker structural requirements for preventing oil spill from an oil tanker (oil tanker) Adopted by the 32nd Marine Environmental Protection Commission (MEPC), July 6, 1993
Oil tankers over 150 GT (Glostone) contracted after the day have a double hull structure (double hul).
l) or mid deck. As for the oil pipes, since it is prohibited to install the ballast water tank in the ballast water tank, when the double bottom of the bottom of the double hull, that is, between the inner shell and the outer shell is used as the ballast water tank. Became unable to adopt a structure in which a coin oil pipe was installed inside the double hull.

In the conventional oil tanker having the double hull structure, as shown in FIG. 4, the inner circumference of the inner hull 9 of the double hull at the bottom of the cargo tank 2 is not in the double hull. It had a structure in which a coin oil pipe 5 was piped on the surface (hereinafter referred to as "prior art 1").

The prior art 1 can satisfy the provisions of the above-mentioned treaty regarding the formation of double hulls and the piping of the oil pipes.

[0005]

However, in the prior art 1, since the cargo oil pipe is piped in the cargo tank 2, inspection and maintenance of the pipe body, valves, etc.
Gas-free (gas removal) after removing the cargo (oil)
It was necessary to carry out after carrying out, and there were too many steps. Moreover, since the cargo tank is in an environment where it is slippery due to residual oil and the like, there is a problem in that the work is difficult.

[0006] Therefore, an object of the present invention is to have a pipe structure of a freight oil pipe capable of complying with the obligation to make a double hull structure due to the amendment of the above-mentioned Marine Pollution Treaty, and a double structure excellent in inspection and maintenance thereof. It is to provide an oil tanker with a hull structure.

[0007]

According to the first aspect of the present invention,
In an oil tanker with a double hull structure, a tunnel is provided in the longitudinal direction of the oil tanker on the inner peripheral surface of the inner shell of the double hull at the bottom of the ship, and a currency oil pipe is provided in the tunnel in the longitudinal direction of the tunnel. It is characterized by being piped.

According to a second aspect of the present invention, in an oil tanker having a double hull structure, the space below the slant portion of the inner shell of the double hull on both sides of the bottom of the hull in the width direction of the hull is utilized to make the oil tanker longitudinal. Is characterized in that a tunnel is provided in and a coin oil pipe is piped in the tunnel in the longitudinal direction of the tunnel.

[0009]

According to the first aspect of the invention, since the tunnel is provided in the cargo tank and the oil pipes are piped in the tunnel, the inside of the tunnel becomes a space where oil does not enter, so that the oil in the cargo tank can It is a dry environment where the attached equipment does not get wet, and it is easy for the operator to maintain.

According to the second aspect of the present invention, a tunnel is formed in the longitudinal direction of the hull utilizing the space under the slant portion (inclined portion) of the inner shell of the double hull on both sides of the bottom of the cargo tank in the width direction of the hull. If the oil pipes are installed in this tunnel and the oil pipes are installed in the void space, it is a dry environment without being wet by the oil in the cargo tank. Excellent in. In addition, when the inside of the double hull is used as a void space, this space can be effectively used.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

[Embodiment 1] FIG. 1 is a vertical sectional view of an oil tanker having a double hull structure showing Embodiment 1 according to the present invention. As shown in FIG. 1, the oil tanker 1
Is provided with a cargo tank (oil tank) 2 provided in the center portion in the width direction of the hull, and cargo tanks 3 and 3 provided on both sides of the central cargo tank 2. The bottom of the cargo tank 2 at the center and the bottoms and sides of the cargo tanks 3 and 3 have a double hull structure. Reference numeral 4 denotes a void space or a ballast water tank at the bottom of the double hull structure, and 7 denotes a void space or a ballast water tank at the side of the double hull structure. A tunnel 8 is provided in the longitudinal direction of the hull on the inner peripheral surface of the inner shell 9 of the double hull at the bottom of the cargo tank 2 at the center. The tunnel 8 is provided between the bulkheads 6 that separate the cargo tank 2 in the center and the cargo tanks 3 on both sides. In the tunnel 8, a plurality of oil pipes 5 are arranged in the longitudinal direction of the tunnel 8. The tunnel 8 of this embodiment is made of a steel plate, but the material of the tunnel is not limited to these.

[Second Embodiment] FIG. 2 is a vertical sectional view of an oil tanker having a double hull structure showing a second embodiment according to the present invention. As shown in FIG. 2, the oil tanker 1
Is provided with cargo tanks 2 and 3 separated by a partition wall 6 provided at the center of the hull in the width direction. The bottoms and sides of the cargo tanks 2 and 3 have a double hull structure. Reference numeral 4 is a bottom space or ballast water tank of the double hull structure, and 7 is a space or ballast water tank of the double hull structure side of the ship. On the inner peripheral surface of the inner shell 9 of the double hull at the bottom of the cargo tank 3, a tunnel 8 is provided in contact with the partition wall 6 in the longitudinal direction of the hull. In the tunnel 8, a plurality of oil pipes 5 are arranged in the longitudinal direction of the tunnel 8. The tunnel 8 of this embodiment is made of a steel plate, but the material of the tunnel is not limited to these. The inventions described in Embodiments 1 and 2 can of course be applied to a double hull tanker having a tank arrangement of the structure (L-0 structure) shown in FIG.

[Embodiment 3] FIG. 3 is a vertical sectional view of an oil tanker having a double hull structure showing an embodiment 3 of the present invention. As shown in FIG. 3, the oil tanker 1
Is equipped with a cargo tank 2. The bottom and the side of the cargo tank 2 have a double hull structure. 4 is a double-hulled space at the bottom of the ship or a ballast water tank,
7 is a space or ballast water tank on the side of the ship with a double hull structure. The slant portions 9c of the inner shell 9 of the double hull on both sides of the bottom of the cargo tank 2 in the width direction of the hull, and between the inner shell 9 and the outer shell 10 in the double hull, A tunnel 8 having a triangular cross section is provided on the outer peripheral surface of the slant portion 9c in the longitudinal direction of the hull. The tunnel 8 is provided so as not to project downward from the bottom 9a of the inner shell 9 and to project outward from the side 9b of the inner shell 9. A coin oil pipe 5 is provided in the tunnel 8 in the longitudinal direction of the tunnel 8. The tunnel 8 may be provided only on one side of the inner shell slant portion 9c on both sides of the bottom of the cargo tank 2 in the width direction of the ship, if necessary. In addition, the invention described in Example 3 has the structure (L-
Of course, the present invention can also be applied to a double hull tanker having a tank arrangement of (1, L-2 structure).

[0015]

As described above, according to the present invention, the tunnel is provided in the cargo tank and the oil pipe is laid in the tunnel, so that the oil pipe does not get wet by the oil and the work is performed in a dry environment. It is possible and the maintainability is improved, and thus an industrially useful effect is brought about.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of an oil tanker having a double hull structure of the present invention.

FIG. 2 is a vertical sectional view showing a second embodiment of the oil tanker having a double hull structure of the present invention.

FIG. 3 is a vertical sectional view showing Embodiment 3 of the oil tanker having the double hull structure of the present invention.

FIG. 4 is a vertical sectional view showing an example of a conventional oil tanker having a double hull structure.

[Explanation of symbols]

 1: Oil tanker 2: Cargo tank 3: Cargo tank 4: Vessel bottom space or ballast water tank 5: Coin oil pipe 6: Bulkhead 7: Vessel side space or ballast water tank 8: Tunnel 9: Inner shell 9a: Ship bottom 9b: Ship side part 9c: Slant part 10: Outer shell 11: Ore and oil tanker ship 12: Combined ship barge 13: Oil tank

Claims (2)

[Claims] 1. In an oil tanker having a double hull structure, a tunnel is provided in the longitudinal direction of the oil tanker on the inner peripheral surface of the inner shell of the double hull at the bottom of the ship, and the longitudinal direction of the tunnel is provided in the tunnel. An oil tanker with a double hull structure, in which a coin oil pipe is installed in the direction. 2. An oil tanker having a double hull structure, wherein a tunnel is provided in a longitudinal direction of the oil tanker by utilizing a space below a slant portion of an inner shell of the double hull on both sides of a ship bottom in a width direction of the hull. An oil tanker having a double hull structure, wherein a coin oil pipe is provided in the tunnel in the longitudinal direction of the tunnel.