JPH0485192A - Cargo oil transferring structure for cargo oil spillage preventing type tanker - Google Patents

Abstract

PURPOSE:To secure such a cargo oil transferring structure as excellent in safety, labor savability and economical efficiency by making a stop valve additionally installed in a side wall upper part of a lower cargo oil tank, partitioned from an upper cargo oil tank by a horizontal bulkhead, possible to be opened or closed by means of remote control from the outside of the lower cargo oil tank. CONSTITUTION:Each double ship side structure 02 is installed at both sides of a cargo oil tank 01, while there is provided a horizontal bulkhead 04 which partitions off the cargo oil tank 01 into an upper cargo oil tank 02 and a lower cargo oil tank 03, and in the shallowest draft state at time of operating a tanker after loading cargo oil in the tank 01, the horizontal bulkhead 04 is set up more downward than a cargo oil level where pressure acting on a ship bottom 05 and pressure in sea-water acting on this bottom 5 becomes equalized. A through piece 1 is installed in a side wall 06 of the lower cargo oil tank 03, and a stop valve 2 capable of doing remote control from the outside of the lower cargo oil tank 03 is installed in the one end of the piece 1. If the stop valve 2 is opened when a broken hole 3 has occurred in the bottom 05 of the lower cargo oil tank 03, the cargo oil in the lower cargo oil tank 03 is automatically transferred into a ship side noncargo oil tank of the double ship side structure 02 as shown in an arrow 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cargo oil transfer structure from a lower cargo oil tank of a cargo oil spill prevention type tanker having a horizontal bulkhead.

[Conventional technology]

(1) Conventionally, in order to limit the spillage of oil from cargo tanks in the event of a grounding or collision, in tankers, non-cargo oil tanks have been installed in areas specified by the Oil Pollution Prevention Act on the ship's side and bottom shells. However, with such a structure, it is difficult to sufficiently prevent oil from spilling overboard from cargo oil tanks.

(2) Therefore, the present applicant first applied for patent application No. 0213
No. 3611 proposed a ``cargo oil spill prevention type tanker''. That is, as shown in the cross-sectional view of FIG.
A horizontal bulkhead 04 that divides the cargo oil tank 01 into an upper cargo oil tank 02 and a lower cargo oil tank 03. is provided so that the horizontal bulkhead 04 can reduce the pressure of cargo oil acting on the bottom 05 of the ship and the seawater acting on the bottom 05 in the shallowest stagnant state when the cargo oil tank 01 is loaded with cargo oil and sailing. It is characterized by being set below the cargo oil level where the pressure is equal to the oil level. Here, 06 is a side wall.

However, with such a structure, if a hole occurs in the bottom 05 of the lower cargo oil tank 03 due to grounding, etc., it is necessary to transfer cargo oil from the lower cargo oil tank 03 to another compartment in order to repair it. However, the following drawbacks are expected.

+i) Pump communicating with lower cargo oil tank 03.

Because the suction pipes are installed on the ship's bottom 05 due to their characteristics, there is a strong possibility that the pump and suction pipes will be damaged as well as the lower cargo oil tank 03 and become unusable. Further, it is difficult to efficiently transfer the cargo oil in the upper part of the lower cargo oil tank 03.

A possible solution to the above problem (1) is to use a portable pump, but it is expensive and difficult to transport into the lower cargo oil tank 03.

[Problem to be solved by the invention]

The present invention was proposed in view of these circumstances, and
Even if the bottom of the ship is damaged due to grounding, etc., it is possible to transfer cargo oil from the lower cargo oil tank to the non-cargo oil tank on the ship's side, and it is easy to operate, and the equipment cost is low.
The object of the present invention is to provide a cargo oil transfer structure for a cargo oil spill prevention tanker that is labor-saving and economical.

[Means to solve the problem]

To this end, the present invention has been designed so that a central cargo oil tank having a ship side non-cargo oil tank adjacent to the ship through a side wall acts on the bottom of the ship in the shallowest stagnant state when the central cargo oil tank is loaded with cargo oil and is operated. A cargo oil spill prevention type tanker that is partitioned into an upper cargo oil tank and a lower cargo oil tank by a horizontal bulkhead installed below the level at which the pressure of the cargo oil acting on the bottom of the ship is equal to the pressure of seawater acting on the bottom of the ship. The stop valve attached to the upper part of the side wall of the lower cargo oil tank can be opened and closed by remote control from outside the lower cargo oil tank.

[Effect]

With the above-mentioned configuration, even if the bottom of the ship is damaged due to grounding, etc., it is possible to transfer cargo oil from the lower cargo oil tank to the ship's side non-cargo oil tank, the operation is easy, and the equipment cost is low. safety.

It is possible to obtain a cargo oil transfer structure for a cargo oil spill prevention tanker that is labor-saving and economical.

〔Example〕

One embodiment of the present invention will be explained with reference to the drawings. The same reference numerals as in FIG. 3 indicate the same members as in the same figure, and first,
In the cross-sectional view of FIG. 1, reference numeral 1 indicates a penetration piece that is installed through the side wall 06 of the lower cargo oil tank 03, and 2 indicates a stop valve that is attached to one end of the penetration piece 1 and can be remotely operated from the outside of the lower cargo oil tank 03. It is.

In such a structure, as shown in the cross-sectional view of FIG. 2, if a hole 3 occurs in the bottom 05 of the lower cargo oil tank 03, the cargo oil will not leak into the external seawater and the stop valve 2 will be opened. Then, due to the pressure difference with the external seawater, the cargo oil in the lower cargo oil tank 03 in the hole 3 passes through the stop valve 21 through piece l and automatically flows into the ship side non-cargo oil tank of the double ship side structure 02 as indicated by arrow 4. Transported as shown.

In addition, it is optimal that the penetration piece 1 and the stop valve 2 are provided at the upper part of the transfer efficiency upper side wall 06. Moreover, it is also possible to arrange multiple sets of penetrating pieces 1 and stop valves 2 in parallel.

According to such a structure, the following effects can be achieved.

+11 Since the transfer structure is mainly formed of a through piece and a stop valve, the structure is simple and the construction cost is low.

(2) Since the transfer structure can be remotely controlled, less manpower is required, thus improving labor savings.

(3) Since the transfer structure is relatively far from the bottom of the ship, it will not be affected in the event of damage to the bottom of the ship, thus improving safety.

〔Effect of the invention〕

In short, according to the present invention, the central cargo oil tank, which has the ship side non-cargo oil tank adjacent to the ship through the side wall, reaches the bottom of the ship in the shallowest stagnant state when the central cargo oil tank is loaded with cargo oil and is operated. A cargo oil spill prevention type that is partitioned into an upper cargo oil tank and a lower cargo oil tank by a horizontal bulkhead installed below the level where the pressure of the cargo oil acting on the vessel is equal to the pressure of seawater acting on the bottom of the ship. In a tanker, the stop valve attached to the upper side wall of the lower cargo oil tank can be opened and closed by remote control from outside the lower cargo oil tank, so that even if the bottom of the ship is damaged due to grounding, etc., the lower cargo oil tank can be closed. A cargo oil spill prevention type tanker that is capable of transferring cargo oil from a tank to a non-cargo oil tank on the ship's side, is easy to operate, has low equipment costs, and is therefore highly safe, labor-saving, and economical. Since the cargo oil transfer structure is obtained, the present invention is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a cargo oil storage state according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the same embodiment as shown in FIG. 1, showing a cargo oil transfer state. FIG. 3 is a cross-sectional view showing the ``cargo oil spill prevention type tanker'' proposed earlier by the present applicant. 1... Penetration piece, 2... Stop valve, 3... Broken hole, 4
...Arrow, 01...Cargo oil tank, 02...Upper cargo oil tank, 0
3...Lower cargo oil tank, 04...Horizontal bulkhead, 05.
...bottom, 06...side wall, WL...water surface, agent Masafumi Tsukamoto, patent attorney

Claims (1)

[Claims] The pressure of the cargo oil acting on the bottom of the ship in the shallowest stagnant state when the central cargo oil tank, which has a ship side non-cargo oil tank adjacent to it through the side wall, is operated with cargo oil loaded in the center cargo oil tank. In the cargo oil spill prevention type tanker, which is partitioned into an upper cargo oil tank and a lower cargo oil tank by a horizontal bulkhead installed below a level at which the pressure of seawater acting on the bottom of the ship is equal to the pressure of the seawater acting on the bottom of the ship, A cargo oil transfer structure for a cargo oil spill prevention type tanker, characterized in that a stop valve attached to the upper part of the side wall of the tank can be opened and closed by remote control from outside the lower cargo oil tank.