JPS5842316Y2 - Moored oil storage tank for Eikai - Google Patents

Description

[Detailed Description of the Invention] The present invention mainly relates to a floating type underwater oil storage tank installed in the icy sea.

Conventionally, most floating oil storage tanks have been ship-shaped or rectangular. However, when floating oil storage tanks are moored at multiple points in icy seas using chains, etc., the conventionally used rectangular In an oil storage tank, when the entire water basin moves after ice forms on the outside of the tank, the ice-breaking resistance is extremely large, and the mooring chain often cannot fully moor the oil storage tank.

In addition, in the case of a ship-shaped oil storage tank, there is little resistance to the movement of ice from the bow direction, but the projected area in the lateral direction is large, and the ice-breaking resistance is extremely large. The problem arises that it is not possible to fully moor the ship.

Therefore, in order to solve the above-mentioned conventional problems, the present invention aims to reduce the ice-breaking resistance to almost the same in the 360-degree direction in a floating oil storage tank moored at multiple points in the sea. The purpose is to reduce the force applied to chenos, etc.

That is, the moored oil storage tank for water and sea of the present invention is an oil storage tank moored on the sea, in which the oil storage tank portion is formed into a truncated cone-shaped disk in which the diameter of the upper surface portion is smaller than the diameter of the lower surface portion. A superstructure is provided on the upper surface of the oil storage tank, and a crane is rotatably installed on the top of the superstructure, and a tanker mooring device and an oil transfer pipe connecting the oil storage tank and the tanker are attached to this crane. It is characterized by the fact that it has been provided.

Embodiments of the present invention will be described below with reference to the drawings.

First, the underwater oil storage tank according to the embodiment of the present invention shown in FIGS. The diameter of the upper surface of the oil storage unit 1 is smaller than the diameter of the lower surface, and therefore has a truncated conical shape.

A plurality of mooring chains 9, one end of which is anchored to the seabed by a sinker 10, are fixed around the lower part of the oil storage tank part 1.
5 is moored.

Reference numeral 12 in the figure indicates an undersea pipeline, through which oil is sent from other production wells to this oil storage tank section 1 and stored therein.

11 is a flexible hose installed underwater, which connects the submarine pipeline 12 and the oil storage tank 1. Even if the moored oil storage tank 1 moves due to external force, this flexible hose 11 allows for tracking.

Note that FIGS. 1 and 2 show examples in which the water depth is shallow, and if the flexible hose 11 is short, the oil storage tank 1
Since it is not possible to follow the movement of the oil storage tank 1, the seabed 15 directly below the oil storage tank 1 is excavated to make the water deeper and the flexible hose 11 longer.

Next, an upper structure part 3 is provided above the oil storage tank part 1, and a living area and machinery are installed therein.

Furthermore, a crane 5 is provided at the top of the center of the oil storage tank part 1 on a rotating member 4 that rotates 360 degrees around the center of the oil storage tank part 1, and the crane 5 communicates with the oil storage tank part 1. A cargo handling hose 6 connected to the oil transfer pipe and a mooring device such as a mooring cable 7 for mooring the transport tanker 2 are provided, and the crane 5 has a rotating structure 16.
When the transportation tanker 2 is moored and the cargo handling hose 6 is connected to the oil transfer pipe from the oil storage tank section 1, even if the transportation tanker 2 rotates around the oil storage tank section 1 due to external force, the rotating member 4
can now be followed.

Normally, the advantage of multi-point mooring using the mooring chain 9 for floating underwater oil storage tanks outside of the ocean is that the momentary wave force caused by waves is dissipated through the catenary of the mooring chain 9, and the external force is the drifting force caused by waves. It is only necessary to take into account tidal current force, wind pressure due to wind, and other values are one order of magnitude smaller than wave force, so this is advantageous compared to a rigid tank such as a bottom-mounted oil storage tank.

In addition, in the present invention, since the rotating member 4 of the oil storage tank section 1 acts as a one-point mooring device, the transport tanker 2 turns in the direction of the minimum external force and the resultant force, so the transport tanker 2
External forces during mooring will also be reduced.

On the other hand, when a floating underwater oil storage tank is installed in an icy sea, it must be taken into consideration that ice floes 13 will come from all directions. A circular shape is better, and furthermore,
According to the results of experiments using actual machines, it has been confirmed that the ice-breaking force between the cylindrical oil storage tank part 1 and the truncated conical oil storage tank part 1 is much smaller.

This is because the cylindrical shape breaks ice by compressive force, but the truncated conical shape breaks ice by bending the ice, and the bending strength of ice is weaker than the compressive strength.

It should be noted that from the above experimental results, when the diameter of the upper surface of the oil storage tank 1 is made smaller than the diameter of the lower surface, the outer plate near the water line of the oil storage tank 1 is vertical to the sea surface 14.
It has been confirmed that slanting inward at 0 degrees or more reduces ice-breaking resistance even in icy seas.

Therefore, according to the oil storage tank of the present invention, since the oil storage tank part 1 is a truncated cone-shaped disk, even if it is moored in the icy sea and is pressed by the water basin from all directions, the ice breaking resistance can be made almost equal, and the ice breaking resistance can be made almost the same at multiple points. The force applied to the cheno 9 etc. during mooring can be reduced.

Moreover, since the oil storage tank part 1 is disc-shaped, the oil storage tank part 1
The outer plate near the waterline begins to slope inward with respect to the sea surface, and as a result, the basin rises along this slope.
The compressive force of the water basin is converted into the bending force of the water basin, and the ice is easily crushed.

Therefore, since the oil storage tank of the present invention is less subject to the compressive force of the water basin, there is no need for the oil storage tank portion 1 to have a heavy structure, and an oil storage tank suitable for use in water and sea can be obtained.

Furthermore, if the underwater oil storage tank of the present invention is adopted, the ice-breaking force will be small even in icy seas, and furthermore, since the waterway will be opened after the ice is broken, it will be easier for transport tankers to approach the underwater oil storage tank. There is an advantage.

Further, since the underwater oil storage tank of the present invention has a single-point mooring device, even if the direction of the water basin changes, the moored transport tanker can easily follow it.

[Brief explanation of drawings]

1 and 2 are a perspective view and a side view, respectively, of an underwater oil storage tank for mooring a transport tanker according to an embodiment of the present invention. 1...Oil storage tank section, 2...Transportation tanker, 3...Superstructure section, 4...Rotating member, 5...Crane , 6... Cargo handling hose, 7... Mooring rope, 14... Sea surface, 16... Rotating structure.

Claims (1)

[Scope of utility model registration request] In an oil storage tank moored on the sea, the oil storage tank part is
It is formed into a truncated cone-shaped disk in which the diameter of the upper part is smaller than the diameter of the lower part, and an upper structure is provided on the upper part of the oil storage tank, and a crane is mounted on the upper part of the upper structure so as to be rotatable. 1. A moored oil storage tank for water and sea, characterized in that the crane is provided with a tanker mooring device, and an oil transfer pipe connecting the oil storage handle and the tanker.