JPH04103482A - Oil-unloading device for tanker having horizontal bulkhead - Google Patents

Abstract

PURPOSE:To apply an oil-submerged type unloading pump to a large size tanker by providing a pressure means, transferring a cargo oil in a lower tank to an upper tank by the pressure of an inactive gas, in the lower tank in a tanker where a cargo oil tank is partitioned with a horizontal bulkhead. CONSTITUTION:A tanker has upper and lower tanks 1 and 2, partitioned with a horizontal bulkhead 4, and both sides ballast tanks 3, and an oil-submerged type oil-unloading pump 5 is provided in the upper tank 1. Also an oil-unloading pipe 7, its lower end is opened in the vicinity of the tank bottom of the lower tank 2 and its upper end is opened in the upper tank 1, and a hatch 9, on which an inert gas pipe 8 is appendantly provided, are provided. A cargo oil in the upper tank 1 is directly unloaded with the oil-unloading pump 5 via a shore tank oil-unloading pipe 6, also a cargo oil in the lower tank 2 is transferred to the upper tank 1 via the oil-unloading pipe 7 for the lower tank by an inactive gas, supplied with the inert gas pipe 8 and having pressure, and then is transferred to the shore tank with the oil-unloading pump 5 for the upper tank.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an oil lifting device for a tanker with horizontal bulkheads.

[Conventional technology]

Conventionally, when tankers are equipped with submerged cargo pumps, each pump has sufficient pump lift to transfer the cargo oil in the cargo oil tank to the onshore tank; Since this requires a large-capacity, large-head pump, its application is limited to tankers of 150,000 DWT or less.

In addition, all pumps on small and medium-sized tankers have a lifting height that allows them to be transported on land.

By the way, recently, in order to prevent a large amount of cargo oil from spilling out in the event of a marine accident, an oil spill prevention type tanker is being planned, in which the cargo oil tank is divided into an upper tank and a lower tank by a horizontal bulkhead. Various methods of lifting oil applied to tankers have been studied.

[The problem that the invention aims to solve]

The present invention has been proposed in view of the above circumstances, and is an economical horizontal bulkhead that enables the application of oil-submerged cargo pumps to large tankers, which were conventionally difficult to apply to large tankers. Its purpose is to provide oil lifting equipment for tankers.

[Means to resolve issues]

To this end, the present invention provides a tanker with an upper and lower double tank structure in which a cargo oil tank is divided into an upper tank and a lower tank by a horizontal bulkhead, in which a submerged cargo pump is provided in the upper tank, and a submerged cargo pump is installed in the lower tank. The present invention is characterized in that a pressurizing means for transferring the cargo oil in the lower tank to the upper tank by the pressure of an inert gas is provided in place of the cargo pump, and the oil is lifted using the cargo pump in the upper tank.

[Effect]

According to this configuration, the upper tank is equipped with a submerged cargo pump, and the lower tank is equipped with inert gas supply equipment with a pressure capable of transferring cargo oil to the upper tank. Compared to an integrated tank type pump, the pump head can be reduced by the depth of the lower tank. Therefore, the pump lifting height is reduced for small and medium-sized tankers (7).It is expected that the existing submerged cargo pump technology can be applied to large tankers as well.

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view thereof.

In the above figure, 1.2 is an upper tank and a lower tank separated by a horizontal bulkhead 4, 3 is a ballast tank on both sides, and 5 is a submerged type or deep well type oil immersion pump attached to the upper tank 1. A land tank oil lifting pipe 6 is connected to the oil lifting pump 5.

7 is an opening at the lower end or near the tank bottom of the lower tank 2 (2, an oil lift pipe for the lower tank whose upper end opens into the upper tank 1; 9 is a hatch with an inert gas pipe attached).

In such a device, the cargo oil in the upper tank 1 is directly lifted by the oil pump 5 through the land tank oil lifting pipe 6,
The cargo oil in the lower tank 2 is lifted to the upper tank l via the lower tank oil pipe 7 by pressurized inert gas supplied through the inert gas pipe 8 connected to the hatch 9, and then lifted to the upper tank l. Cargo pump 5 and land tank oil lift pipe 6
After that, it is transferred to a tank on land.

〔Effect of the invention〕

According to such a device, the lifting head of the upper tank cargo pump is reduced by approximately half the tank depth,
It is now possible to equip large tankers with oil-submerged cargo pumps, which was not previously possible, and it is now possible to use inexpensive pumps with a lower head than conventional pumps for small and medium-sized tankers. becomes possible.

In short, according to the present invention, in a tanker having an upper and lower double tank structure in which a cargo oil tank is partitioned into an upper tank and a lower tank by a horizontal partition, a submerged type cargo pump is provided in the upper tank, and the lower tank is provided with a submerged cargo pump. Conventionally, by providing a pressurizing means to transfer the cargo oil in the lower tank to the upper tank by the pressure of inert gas instead of the cargo pump, and lifting the oil using the cargo pump in the upper tank, The present invention is industrially extremely useful because it provides an economical oil lifting device for tankers with horizontal bulkheads that makes it possible to apply submerged cargo pumps to large tankers, which have been difficult to apply to large tankers. be.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a tanker with horizontal bulkheads showing an embodiment of the present invention. 1... Upper tank, 2... Lower tank, 3... Ballast tank, 4... Horizontal bulkhead, 5... Lifting pump, 6... Land tank lifting pipe, 7... Lower part Lifting oil pipe for tank, 8... Inert gas pipe, 9... Hatsuchi, agent Masafumi Tsukamoto, patent attorney

Claims (1)

[Claims] In a tanker having an upper and lower double tank structure in which the cargo oil tank is divided into an upper tank and a lower tank by a horizontal bulkhead, a submerged type cargo pump is installed in the upper tank, and
The lower tank is equipped with a pressurizing means for transferring the cargo oil in the lower tank to the upper tank by the pressure of inert gas instead of the cargo pump, and the oil is lifted using the cargo pump in the upper tank. Oil lifting equipment for tankers with horizontal bulkheads.