JPH0469314B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a cargo handling hose line for transporting oil such as crude oil from an oil tanker anchored offshore to an onshore crude oil storage facility, particularly a single anchorage hose line. Single Anchor Leg
The present invention relates to a laying structure for a cargo handling hose line laid on the sea via a one-point mooring buoy (Mooring), and more particularly to a laying structure suitable for floating or sinking the hose line to the water surface or the seabed.

[Prior art]

Conventionally, as shown in Fig. 4A, a catenary-shaped fixing member (anchor chain, etc.) is moored to the seabed Sb by a plurality of catenary-like fixing members (anchor chains, etc.) Ac, Ac.
The cargo handling hose line 1 is laid along the water surface with a one-point mooring buoy Mb (anchor leg mooring), and the other is the cargo handling hose line 1, which is moored to the seabed Sb by a single fixing member Al as described above (SALM type). )
There is a cargo handling hose line 1 laid through a single point mooring buoy Mb. (See FIG. 4B) The present invention provides a solution to the following problem, particularly in the latter case.

[Issue to be solved]

Referring to FIG. 4B, the cargo handling hose line 1 using the SALM-type single-point mooring buoy is connected to the swivel joint Sj of the submarine oil pipeline Sp provided in the middle of the fixing member Al of the buoy Mb. A plurality of unit hoses 3a, 3 connected in a catenary shape
an underwater floating hose section 1a consisting of a,...;
It consists of a water surface floating hose part 1b composed of a plurality of unit hoses 3b, 3b, . . . connected to the end of the underwater floating hose part 1a.

Each of the upper unit hoses 3a, 3b is fitted with a plurality of floats 11, 11, . ... is attached to give appropriate buoyancy, but in particular, the underwater floating hose portion 1a has a gentle catenary shape as a whole by appropriately adjusting the buoyancy of each float 11 and float tank 12. It is laid out so that it exhibits.

On the other hand, the cargo handling hose line 1 is used for oil conveyance work in order not to get in the way of ships sailing nearby, or to prevent each unit hose 3a, 3b from being damaged due to collisions with trees downstream in rough weather. After the hose line is finished, the hose line is filled with underwater water and allowed to sink to the seabed. Note that the purpose of filling the seawater is not only to allow it to sink to the seabed, but also to prevent oil remaining inside from spilling out to sea if part of the hose line were to break due to an unexpected accident during work stoppages. There is also a purpose.

In any case, if the horizontally extending water surface floating hose section 1b sinks to the seabed due to filling with seawater, the plurality of floats 11, 11...
The underwater floating hose section 1a, which is bent into a catenary shape as a whole due to the buoyancy of the float tanks 12, 12, . ..., 3b, 3b... causes an extreme bending phenomenon called "kink phenomenon", and the unit hose 3a or 3b is damaged.

[Purpose of the invention]

The present invention provides a solution to the above-mentioned problems, allows the hose line to form an appropriate catenary shape during operation, and also allows the unit hoses constituting the hose line to be The purpose of the present invention is to provide a cargo handling hose line installation structure that is particularly suitable for SALM-type single-point moored buoys, which can curve gently toward the seabed without causing the "kink phenomenon."

[Means for solving problems]

In order to achieve the above object, the present invention provides “SAL
In a cargo handling hose line consisting of a plurality of unit hoses connected in a catenary shape to a swivel joint of a submarine oil pipeline installed in the middle of a fixing member of a single point mooring buoy called "M. type", A flotation hose line that communicates with an air supply source at one end is laid along the water surface in parallel with the cargo handling hose line, and the flotation and sinking hose line and the cargo handling hose line are arranged at a predetermined distance between the two hose lines. It is characterized in that it is interconnected by a plurality of connecting ropes having lengths corresponding to the intervals.

The unit hose constituting the cargo handling hose line according to the present invention has a required number of reinforcing fabric layers embedded in the pipe body, similar to known cargo handling hoses, and has metal flanges for connection at both end openings. It is composed of a rubber tube (see Figure 2). Furthermore, the unit hoses constituting the flotation hose line are also constructed from rubber tubes similar to those described above. Note that the cargo handling hose line can be supplementarily equipped with a buoyancy member such as a float, as in the conventional case.

One end of the flotation hose line may be directly connected to a single-point mooring buoy, but as will be described later, it should be ensured that the flotation hose line does not become unreasonably curved when it sinks to the seabed together with the cargo handling hose line. In order to achieve this, it is preferable that the mooring buoy be separated from the one-point mooring buoy and moored to the mooring buoy by a flexible connecting member such as a rope. Also,
In this case, the one end of the flotation hose line is connected to the connection port of the supply and exhaust piping on the single point moored buoy via the supply and exhaust hose. Furthermore, in order to facilitate the floating and sinking work of the cargo handling hose line, it is preferable to equip the other end of the floating and sinking hose line with a water supply and drainage valve whose opening and closing operations are remotely controlled by electric signals.

[Action/Effect]

As described above, the cargo handling hose line of the present invention has the following features:
During operation, the flotation hose line, which is laid approximately horizontally along the water surface, and the cargo handling hose line, which is to have a predetermined catenary shape, are connected to each other by a connecting cable having a length corresponding to the predetermined spacing between the two lines. Since they are connected to each other, the water supply and drainage valve of the flotation hose line is opened by remote control, preferably using an electric signal, and air is fed into the hose line from an air supply source through the supply and exhaust hose. When the valve is closed, the flotation hose line floats to the water surface, and as a result, the cargo handling hose line, particularly the underwater floating hose section, assumes a desired catenary shape and is suspended from the flotation hose line. That will happen.

On the other hand, if the cargo handling hose line is to sink to the seabed, the water supply and drainage valve of the floating and sinking hose line can be opened by remote control as before, and the air in the hose line can be discharged, preventing seawater from entering. The hose line loses its buoyancy and sinks to the seabed together with the cargo handling hose line, but in this case, the cargo handling hose line is connected to a buoyant member such as a float tank, as in the case of the conventional SALM type cargo handling hose line. Since it is not forced to curve into a catenary shape, when the suspension force from the floating hose line is released, it can freely curve in all directions using the connection with the swivel joint of the submarine oil pipeline as a fulcrum. Therefore, unlike conventional cargo handling hose lines, the hose line can sink to the sea floor without the "kink phenomenon" associated with deformation from a catenary shape to an inverted catenary shape. (See FIG. 3) [Examples] Examples of the present invention will be described below.

FIG. 1 is a schematic diagram of a construction for laying a cargo handling hose line according to an embodiment of the present invention. The cargo handling hose line 1 of this example has a plurality of reinforcing layers 4, 4 embedded therein as shown in FIG. As shown in Figure 1, the required number of wires are connected in series. One end of this cargo handling hose line 1 is connected to a submarine oil transmission pipe Sp installed in the middle of the anchoring member Al of the SALM type single point mooring buoy Mb.
The other end of the hose line 1 is removably connected to a swivel joint Sj, and the other end of the hose line 1 is removably connected to an oil feed port (not shown) of an oil tanker.

In this example, a floating hose line 2 separate from the cargo handling hose line 1 is laid in parallel with the former 1. This flotation hose line 2 is constructed by connecting in series the required number of rubber unit hoses 3 as shown in FIG. In this case, one end of the hose line 2 is moored to the buoy Mb by a long rope 6 that is moored at one point to the buoy Mb, and the supply and exhaust piping on the buoy Mb is connected. It is connected to the port 8 via a supply/exhaust hose 7. moreover,
The other end of the flotation hose line 2 in this example is equipped with a water supply and drainage valve 9 whose opening and closing operations are remotely controlled by electric signals. (omitted), the water surface rises as shown in the figure.
It levitates in a roughly straight line along WL.

As shown in Fig. 1, the upper floating hose line 2 and the preceding cargo handling hose line 1 are laid in the manner they should be during operation, that is, the former 2 has a straight line shape, and the latter 1 has a catenary shape. A plurality of chains 10a, 10b, .
They are interconnected by h.

The cargo handling hose line 1 of this example having the above configuration has a third
As will be described later with reference to the figure, when the water supply and drainage valve 9 of the flotation hose line 2, which has settled on the seabed Sb together with the hose line 1, is opened, air is pumped into the hose line 2 via the supply and exhaust hose 7. When the hose line 2 is filled with air by closing the valve 9, the hose line 8 begins to float, and eventually drops to the water surface.
It floats to WL, but along with this, the cargo handling hose line 1 also rises, and finally, each chain 10a, 10b...1
It is suspended in a predetermined catenary shape by 0h.

On the other hand, when the oil feeding work is completed, the water supply and drainage valve 9 of the flotation hose line 2 is opened, and at the same time, air is discharged from the hose line 2 via the supply and exhaust hose 7, thereby causing the air to flow into the hose line 2. When filled with seawater, the hose line 2 will be filled with seawater Sb.
As shown in Figure 3, the cargo handling hose line 1 begins to sink and eventually reaches the seabed Sb, but along with this, the cargo handling hose line 1 loses its buoyancy, or more precisely, the suspension action of the floating hose line 2 In order to release from the Sb, it similarly sinks onto the seafloor Sb. In this case,
The cargo handling hose line 1 of this example is different from the conventional cargo handling hose line which has a catenary shape using a floating member such as a float, and has a catenary shape with the swivel joint Sj of the submarine oil transmission pipe Sp as a fulcrum. Since the hose line 1 can be freely bent into a reverse catenary shape, a "kink phenomenon" does not occur in some rubber unit hoses 3, and the hose line 1 can be bent freely.
The entire body curves gently toward the seabed Sb, and the seabed Sb
It can be sunk above.

〔Effect of the invention〕

As detailed above, the present invention provides a cargo handling hose consisting of a plurality of unit hoses connected in a catenary shape to a rotary joint of a submarine oil pipeline provided in the middle of an anchor cable member of a single point moored buoy. In the line, a flotation hose line whose one end communicates with an air supply source is laid along the water surface in parallel with the cargo handling hose line, and the flotation and sinking hose line and the cargo handling hose line are connected to both hoses. Since the lines are interconnected by a plurality of connecting cables having lengths corresponding to predetermined intervals between the lines, an appropriate catenary shape can be formed for the cargo handling hose line during operation, and the Even when the entire hose line is submerged to the seabed, the unit hoses that make up the hose line can curve gently toward the seabed without causing a "kink phenomenon," especially when using SA.
It is possible to provide a cargo handling hose line installation structure suitable for LM type single point mooring buoys.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the laying structure during operation of a cargo handling hose line according to an embodiment of the present invention;
Figure 2 is a partial sectional view of the rubber unit hose that constitutes the hose line in Figure 1, Figure 3 is a schematic diagram showing the submerged state of the cargo handling hose line in Figure 1, and Figures 4 A and B are conventional hoses. It is an explanatory view of two types of mooring modes in a single point mooring buoy. In each figure, the meanings of the symbols are as follows; 1...Hose line for cargo handling, 1a...Hose part floating in water, 1b...Hose part floating on water surface, 2...Hose line for floating and sinking, 3, 3a, 3b... Rubber unit hose, 4... Reinforcement layer, 5... Metal flange,
6... Rope, 7... Supply/exhaust hose, 8... Connection port for supply/exhaust piping, 9... Supply/drainage valve, 1
0a to 10h... Connection chain, 11... Float, 12... Float tank, Ac... Anchor chain, Al... Fixing member, Mb... Single point mooring buoy, Sb... Seabed, Sp... Seabed oil pipeline,
Sj...Swivel joint, WL...Water surface, l...Length of 10a, etc.

Claims (1)

[Scope of Claims] 1. A cargo handling hose line consisting of a plurality of unit hoses connected in a catenary shape to a rotary joint of a submarine oil pipeline provided in the middle of a member for fixing a single point mooring buoy, A flotation hose line whose one end communicates with an air supply source is laid along the water surface in parallel with the cargo handling hose line, and the flotation and sinking hose line and the cargo handling hose line are connected between the two hose lines. 1. A cargo handling hose line installation structure, characterized in that the hose line is interconnected by a plurality of connecting ropes having lengths corresponding to predetermined intervals. 2. The cargo handling hose line installation structure according to claim 1, wherein one end of the flotation hose line is separated from a one-point mooring buoy and is moored to the mooring buoy by a connecting member such as a rope. 3. The structure for laying a cargo handling hose line according to claim 1 or 2, wherein a water supply and drainage valve remotely controlled by an electric signal is provided at the other end of the floating hose line.