JPS62201794A - One-point mooring arrangement for cargo-handling - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a single-point mooring device used when loading and unloading fluid cargo from the seabed to the hull of a ship.

[Conventional technology]

A single point mooring device for mooring a purge for pumping up crude oil from an oil field on the seabed for storage or primary refining is t.
As shown in Figure tS4.5, a single point mooring device in which a mooring turret 5 is rotatably supported within a well 14 formed in the hull of the purge 3 has been developed.

In such a single point mooring device, a turret 5 is supported in a well 14 via a bearing 15, and the turret 5 is moored by a plurality of anchor chains 4.

In addition, a plurality of fixed riser pipes 2 are arranged in the vertical direction inside the turret 5, and each fixed riser pipe 2
A flexible riser pipe 1 led from the seabed is connected to the lower end of each.

On the hull of the purge 3, the same number of fixed pipes 10 as the fixed riser pipes 2 are arranged, and the fixed pipes 10 are connected to the inboard tank in the part 3. Each fixed riser W2 and fixed arrangement? ? 1
A multi-stage central swivel 11 is provided to connect the

This multi-stage central swivel 11 is fixed f:J1 fixed on the turret 5, as shown in Figure i96.7.
2, and a rotating cylinder 13 that fits around the fixed housing 12 and rotates together with the hull of the purge 3.
The same number of rectangular cambers 16 as the fixed riser pipe 2 are formed over the entire circumference between the rotary cylinder 13 and the fixed riser pipe 2 .

Each of the fixed riser pipes 2 guided from the turret 5 in the fixed cylinder 12 opens one end to the outer peripheral surface of the fixed cylinder 12 and communicates with the square camber 16, respectively.

On the other hand, each fixed pipe 1 led from the hull of part 3
0 is a rectangular camber 1 from the outer periphery of the rotating cylinder 13, respectively.
Connects to 6.

In addition, in the r:tS6 diagram, reference numeral 17 indicates a turret side cable, 18 indicates a cable swivel, 19 indicates a purge side swivel, and 20 indicates a packing.

The hull of the purge 3 described above swings around the turret 5 due to the influence of wind, waves, currents, etc. when moored.

Along with this, the tube 13 rotates around the fixed tube 12 together with the hull of the purge 3, and at that time, the packing 20 slides while being pressed against the outer periphery of the fixed tube 12, so that it is fixed to the fixed riser tube 2. The piping 10 is liquid-tightly connected to the piping 10 by a square camber 16.

[Problem that the invention seeks to solve]

However, in the single point mooring device described above, since the fluid cargo such as crude oil supplied from the seabed through the riser pipe 1 is under high pressure, the sealing of the rectangular camber 16 by the seal 20 is not reliable, and the fixed cylinder 12 and rotating cylinder There is a problem in that liquid often leaks between the tube and the tube.

Also, riser pipe 1. removing the wax contained in the crude oil adhering to the pipe wall of the fluid passage consisting of the fixed riser fF 2 + the square camber 16 and the fixed pipe 10;
When converting the fluid cargo to be transported, a so-called big push operation is required to pass the pig through the fluid passage, but the central swivel 11 does not allow the pig to pass through the rectangular camber 16, and the fluid It is difficult to clean the passageways and replace fluid cargo.

Further, the multi-stage central swivel 11 has a very complicated structure, which is expensive to manufacture, and requires a great deal of effort and expense to maintain.

The present invention aims to solve the problems described in (1). It is possible to reliably transport fluid cargo from the seabed to the ship's hull with a simple structure, and it also allows a pig to be easily passed through the fluid passage. The purpose of this invention is to provide a single-point mooring device for cargo handling, which allows the cargo to be moved.

[Means for solving problems]

For this reason, the cargo handling/personnel mooring device of the present invention is provided with a mooring turret 1 rotatably supported within a well of the hull, and connected to a riser pipe led from the T direction within the turret. A first drum for winding up a flexible tube connected to the piping is fixedly installed on the upper part of the turret, and a first drum for winding the flexible tube connected to the piping is installed on the hull. The seventh drum is characterized by being rotatably provided with a second drum for winding up, and a relay pipe extending from the tube in the second drum to the inboard tank.

[For production]

In the single-point mooring device for cargo handling of the present invention, as the hull rotates around the turret, the flexible tube is unwound from the first drum and the f:tS2 drum. be wound up by
It is wound up by the drum of fjSi and also unwound from the second drum.

〔Example〕

Hereinafter, a single point mooring device for cargo handling as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a schematic side view thereof, and Fig. 2 is a schematic longitudinal cross-sectional view showing an enlarged view of its main parts. , FIG. 3 is a view taken along the arrow I in FIG. 2.

As shown in FIGS. 1 to 3, a turret 5 is supported in a well 14 formed in the hull of the purge 3 via a bearing 15, and the turret 5 is moored by a plurality of anchor chains 4.

Furthermore, fixed risers TF2 as a plurality of cargo handling pipes are connected in the vertical direction inside the turret 5, and flexible riser bones 1 guided from the seabed are connected to the lower ends of each fixed riser pipes 2. be done.

On the turret 5, there are the same number of IFs as the fixed riser pipes 2.
, one drum is stacked on top of another, and the fixed drums 6 are fixed to the turret 5 so as not to rotate.

These fixed drums 6 are arranged so that their central axes coincide with the central axis of the turret 5.

- The same number of winch drums 8 as second drums as the fixed drum 6 are distributed on the hull of the power and purge 3, and these winch drums 8 are rotationally driven by a winch drive mechanism (not shown). I'm working hard to make it happen.

2. On the outer periphery of each fixed drum 6, there is a fixed riser Ir! guided from the turret 5. 2 is open at one end, and a flexible tube 7 is connected to each fixed riser pipe 2.

These flexible tubes 7 are partially attached to a fixed drum 6.
from the fixed drum 6 to the winch drum 8.
At the same time, a part of it is also attached to winch 1.
/ram is wound 81 times.

One end of the flexible chain 7 on the winch drum 8 side is connected to an internal drum pipe 10' that opens at the outer periphery of the winch drum 8.

Further, the drum recording wio' is connected to the fixed piping 10 on the hull of the part 3 via the swivel 9, and these drum recording ff1O', the swivel 9 and the fixed amount wio''I:
h A relay pipe is constructed from the flexible tube 7 to the inboard tank of part 3.

Furthermore, the winch drum 8 is provided with a tension detection mechanism (not shown) for detecting the tension of the flexible chain 7, and the opening force detection plate groove is connected to the winch drive 8! connected to the system controller.

Since the one-point mooring device for cargo handling of the present invention is configured as described above, when the hull of the part 3 swings around the turret 5 due to wind, waves, tides, etc., the tension detection 1
fi4N detects a change in the tension of the flexible tube 7, and this detection signal is sent to the controller of the winch drive mechanism, and the winch drum 8 is activated to drive the winch so that the tension of the flexible tube 7 is constant. When the hull of the purge 3, which is rotationally driven by the rock bucket, swings counterclockwise around the turret 5 as shown in FIG. The drum 8 is rotated in the clockwise direction shown in FIG.

On the other hand, the hull of Purge 3 is rjS centered around turret 5:
+ When swinging clockwise as shown in the figure, the flexible tube 7
is wound up by the fixed drum 6, and the winch drum 8 is moved against the hull of the part 3 by the winch drive +91 mechanism as shown in FIG.
1, and a part of the flexible tube 7 is let out from the winch drum 8.

In this way, in the single point mooring device for cargo handling of the present invention described above, even if the hull of the purge 3 swings around the turret 5, the tension of the flexible tube 7 is kept constant. The cable 7 will not sag and get tangled with any member on the hull or be torn off.

As a result, the connection between the fixed riser pipe 2 led from the seabed and the fixed pipe 10 on the hull of the purge 3 is maintained securely, so fluid cargo such as crude oil supplied from the seabed can be easily transported inside the ship of part 3. is fed to the tank.

In addition, sufficient sealing performance is ensured at the connection between the fixed riser pipe 2 and the flexible tube 7, the connection between the flexible tube 7 and the drum internal piping 10', and the swivel 9. Fluid leakage is prevented.

Furthermore, riser pipe 1. Fixed user F2. Flexible tube 7, drum record 'i? The fluid passage consisting of 10'+ swivel 9 and fixed piping 10 allows the pig to easily pass through, so it is possible to remove waste, etc. attached to the pipe wall of the fluid passage, or to convert the fluid cargo to be transported. It is also easy to push the pig when doing so.

Moreover, the single-point mooring device for cargo handling has a simple VI structure, which not only reduces the manufacturing cost, but also significantly reduces the one-hour labor and V cost required for its maintenance.

〔Effect of the invention〕

As described in detail above, according to the single point mooring device δ for cargo handling of the present invention, a mooring turret rotatably supported in the well of the hull is provided, and a A first drum is provided with cargo handling piping connected to the led riser pipe, and a first drum that takes 8 flexible tubes connected to the piping is fixedly installed on the upper part of the turret. , with a simple configuration in which a Pt52 drum is rotatably provided for winding the tube across from the fjSl drum, and a relay pipe is provided from the tube in the second drum to the inboard tank, Fluid cargo from the seabed can be reliably transported to the above-mentioned inboard tank, and the work of pushing the fluid inside the fluid passage can be carried out easily and efficiently.

In addition, the single-point mooring device for cargo handling mentioned above has a simple structure, so
Not only is the cost of manufacturing reduced, but the labor and expense required for its maintenance are also significantly reduced.

[Brief explanation of drawings]

Figures 1 to 3 show one-point mooring for cargo handling as an embodiment of the present invention. Figure 1 is a schematic side view of
Figure 12 is a schematic vertical cross-sectional view showing an enlarged view of the main part, Figure 3 is a view taken in the direction of the ■ arrow in Figure 2, and Figures 1fi4 to 7 show a conventional single-point mooring device for cargo handling. Fig. fmA is a schematic vertical cross-sectional view of the same, Fig. 5 is a schematic side view showing the turret and central swivel, flB611 is a vertical cross-sectional view showing the central swivel in detail, and Fig. 7 is the same as that shown in Fig. 6. −■ It is a sectional view taken along the arrow. 1. Flexible riser pipe, 2. Fixed riser pipe as cargo handling piping, 3. Purge, 4. 7-car chain, 5. Turret (, 6. Fixed drum as first drum) ,7...Flexible tube,)3...? Winch drum as the drum of tS2, 9... Swivel that makes up the middle a pipe, 10... Fixed piping that makes up the middle Jll pipe,
10'... Piping inside the drum that constitutes the relay pipe, 14...
Well, No. 15 bearing. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 2 ↓■ Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A rotatably supported mooring turret is provided in the well of the hull, and cargo handling piping is provided within the turret to be connected to a riser pipe led from below.
A first drum for winding up a flexible tube connected to the piping is fixedly installed on the upper part of the turret, and a first drum for winding up the flexible tube by extending it from the first drum onto the hull is fixed. A one-point mooring device for cargo handling, characterized in that a second drum is rotatably provided, and a relay pipe is provided from the tube in the second drum to an inboard tank.