JPS59128094A - Sea water supplying device for off-shore working platform - Google Patents

Abstract

PURPOSE:To enable to supply sea water onto an off-shore working platform through a sea water feeding pipe without using any expensive underwater pump, by providing a buoyancy chamber and a watertight pump chamber at a lower end part of a leg member liftably supported by the working platform. CONSTITUTION:The buoyancy chamber 2 is provided at the lower end part of the leg member 4 so provided that it can be lifted while penetrating through the off- shore working platform 1, whereby the weight of the member 4 is borne by the chamber 2. Further, a watertightly partitioned pump chamber 12 is provided at a part of the buoyancy chamber 2 to supply sea water onto the working deck 1 through an intake part 13, a feeding pipe 5 and a flexible pipe 6. Accordingly, the sea water intake level can be easily adjusted by the buoyancy chamber 2, and it is enabled to use an ordinary pump in the watertight pump chamber 12 instead of using an expensive underwater pump.

Description

[Detailed description of the invention] The present invention relates to an apparatus for supplying seawater to an offshore work platform.

In general, with a seawater supply device for an offshore work platform (jack-up rig), height fluctuations occur between the sea level and the rig when the offshore work platform jacks up the rig for fixing the rig and digging. Water can be taken in according to demand.

However, the depth of water varies from place to place, and positioning the seawater supply device is not easy.

Therefore, in conventional seawater supply devices, a submersible pump is attached to the required height of the rig leg corresponding to a preset water level, and the movement of the rig leg is utilized.

In addition, in conventional pond seawater supply systems, the submersible pump is installed using an external force such as a crane to reach the set water level.
A shortcut method has also been adopted.

However, such conventional seawater supply devices for offshore work platforms have the following drawbacks and problems.

(1) Both use submersible pumps, which are expensive and require long delivery times.

(2) The pump must be installed within the range of the legs of the rig or the crane, and there are restrictions on where it can be placed.

(3) Since the submersible pump is fixed to the rig, this amount of load is applied when the rig is jacked up, which is disadvantageous.

The present invention aims to solve these problems.
To provide a seawater supply device to an offshore working platform which enables seawater to be supplied to an offshore working platform using a normal pump without using a special submersible pump, and which is free from restrictions on its placement location. The purpose is to

For this reason, the seawater supply device for an offshore workbench of the present invention includes a columnar member vertically penetrating the offshore workbench and provided so as to be movable up and down, and a lower end of the columnar member to support the weight of the columnar member. a buoyancy chamber provided in the section, a pump chamber watertightly provided in the columnar member, and a seawater feed pipe that is connected to a seawater pump provided in the pump chamber and supplies seawater to the workbench in the groove. It is characterized by having the following.

Hereinafter, a seawater supply system for an offshore workbench as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a side view showing the seawater supply system when the offshore workbench is floating on the sea, and Fig. 2 1 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a side view showing the seawater supply device when jacking up the offshore work platform.

As shown in FIG. 1, a guide hole 11 is opened in the offshore work platform 1 and extends vertically through the guide hole 11, and a columnar part 4 that constitutes the seawater supply device main body A is raised and lowered in the guide hole 11. possible.

The columnar member 4 is composed of four pipe-like vertical members 10 and a frame that connects and reinforces each pipe-like vertical member 10. (See Figure 2) A buoyancy chamber 2 and a seawater pump chamber 12 are provided at the lower end of the columnar member 4. The buoyancy chamber 2 supports the weight of the columnar member 4 by its buoyancy. It has a ballast pump device (not shown) and also functions as a ballast tank.

The seawater pump chamber 12 has a watertight structure, and is provided with a seawater pump P capable of sucking external seawater.

This seawater pump P supplies seawater sucked through a seawater suction pipe 13 to the offshore work platform 1 via a seawater supply pipe 5 and a flexible pipe 6 fixed to a columnar member 4.

In addition, the code|symbol 3 in each l shows the cylinder which comprises a hollow passage, 7 is the fixing hardware of the columnar member 4, 8 and 9 are both support wires, 14 is a wire insertion hole, IS, 16 is All are wire locking members, 17 and 18 are electric wires disposed along the seawater supply pipe 5 and the flexible pipe 6, respectively, and W indicates the seawater level.

Since the seawater supply device for the offshore work platform of the present invention is configured as described above, as shown in FIG.
When being towed or before being polished, the offshore work platform 1 floats on the water surface due to its own buoyancy.

The seawater supply device main body A is in a floating state due to the buoyancy of the buoyancy chamber 2 so as not to apply its own weight directly to the offshore work platform 1.
Fixed hardware 7 and support wire 8 to prevent shaking and vibration
It is fixed to the offshore work platform 1. At this time, the water level of the seawater supply device main body A is adjusted to rA by the ballast pump device provided in the buoyancy chamber 2.

Next, water is sucked in by the seawater pump P installed in the seawater pump room 12 and sent into the offshore workbench 1 through the seawater supply pipe 5 and the flexible pipe 6.

Here, since the flexible pipe 6 is used,
Regardless of the relative sliding between the offshore work platform 1 and the columnar member 4, water can flow without interruption.

Furthermore, as shown in FIG. 3, in order to jack up the offshore work platform 1 and make it ready for work, the support wire 8 shown in FIG. 1 is removed and the ballast pump device installed in the buoyancy chamber 2 is While adjusting, remove the fixing hardware 7 and float the seawater supply device body A to the required water level.

Next, as shown in FIG. 3, the offshore workbench 1 is jacked up to a predetermined position, and the seawater supply device main body A is fixed to the offshore workbench 1 using the fixing hardware 7 and the support wire 9.

Here, the support wire 9 is attached to the seawater supply device main body A by a work boat when necessary. Water is fed by this seawater supply device main body A.

Also, in order to transition from the state shown in Figure 3 to the state shown in Figure 1,
The procedure described above is reversed.

If the equipment in the buoyancy chamber 2 is operated remotely from the offshore workbench 1, there is no need for people to go to the seawater pump room 12 for operation, but if the equipment in the buoyancy chamber 2 is operated remotely, If it enters, it can enter from the cylinder 3.

As described in detail above, according to the seawater supply device for an offshore workbench of the present invention, there is a columnar member that vertically penetrates the offshore workbench and is movable up and down, and a columnar member that supports the weight of the columnar member. A buoyancy chamber provided at the lower end of the columnar member, a pump chamber watertightly provided in the columnar member, and a seawater pump provided in the pump chamber are connected to supply seawater to the offshore work platform. It has a simple configuration consisting of a seawater feed pipe and has the following effects and advantages.

(1) An inexpensive general pump can be used without using an expensive submersible pump, contributing to cost reduction.

(2) Since the seawater intake level is adjusted using buoyancy, the set water level can be easily adjusted.

(3) The installation location of the seawater supply device body does not have to be limited to the legs of the rig or within the range of the crane, unlike conventional devices, and the installation range can be expanded.

[Brief explanation of the drawing]

The figures show a seawater supply system for an offshore work platform as an embodiment of the present invention. Figure 1 is a side view of the seawater supply system when the offshore work platform is floating on the sea, and Figure 2 is a side view of the seawater supply system when the offshore work platform is floating on the sea. FIG. 1 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 13 is a side view showing the seawater supply device when jacking up the offshore work platform. 1. Marine work platform, 2. Buoyancy chamber, 3. Cylinder, 4.
Column member, 5...Seawater feed pipe, 6...7 Lexiful pipe, 7...Fixing hardware, 8, 9...Support wire, 10...
Pipe-shaped vertical part shrine, 11... Guide hole part, 12... Seawater pump chamber, 13... Seawater suction pipe, 14... Wire insertion hole,
15.16... Wire locking member, 17118... Electric wire,
A...Seawater supply device body, P...Seawater pump, W...Sea surface. Sub-Agent Patent Attorney Yoshihiko Iinuma Figure 2

Claims (1)

[Claims] A columnar member that vertically penetrates the offshore work platform and is vertically movable; a buoyancy chamber provided at the lower end of the columnar member to support the weight of the columnar member; A pump room provided in the seawater workbench, and a seawater supply pipe connected to a seawater pump provided in the pump room to supply seawater to the seawater workbench. Seawater supply equipment.