JPH0490985A - Two-stage pumping-up type tanker - Google Patents

Abstract

PURPOSE:To feed oil with the aid of a low-cost submerged type pumping-up pump by respectively mounting pumping-up pumps to upper and lower oil tanks, and pumping up oil in the lower oil tank in two stages through the upper oil tank. CONSTITUTION:A horizontal partition wall 4 to divide a tank in a ship into upper and lower oil tanks 1 and 2 is provided. A submerged type pumping-up pump 5 capable of feeding oil through a tank pumping-up pipe 8 on a ground to a tank on a ground is located to the tank 1, and a submerged type pumping-up pump 6 capable of feeding oil through a pumping-up pipe 7 to the tank 1 is mounted on the tank 2. Thus, the pump 6 may be a pump having a pump lift enough for pumping up oil to the tank 1 and regarding the pump 5, a lift being lower compared with a case where there is no horizontal partition wall 4 suffices for operation of the pump, and equipping with a low-cost submerged type pumping-up pump is practicable.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a cargo oil spill prevention type tanker l in which an inboard tank is partitioned into an upper cargo oil tank and a lower cargo oil tank by a horizontal bulkhead.
In particular, the present invention relates to a two-stage cargo tanker with improved cargo loading means for the lower cargo oil tank.

[Conventional technology]

Recently, in order to prevent oil from spilling out when the hull is damaged due to grounding, etc., the inboard tank is divided into an upper cargo oil tank and a lower cargo oil tank by a horizontal bulkhead, or from an environmental protection point of view. In order to unload cargo, it is necessary to equip each of the upper cargo oil tank and the lower cargo oil tank with a cargo pump.

[Invention or problem to be solved]

By the way, in large tankers, when lifting cargo from the lower cargo oil tank mentioned above to a tank on land, a pump with a large capacity and a large lift is required, so an inexpensive submerged cargo pump (submerged pump or deep well pump) is used. type pump)
The problem is that it cannot be used.

The present invention aims to solve these problems, and includes a submersible cargo pump having a pump lift capable of lifting cargo oil from a lower cargo oil tank to an upper cargo oil tank, and It has a two-stage configuration with a submersible cargo pump that can lift cargo oil from tanks to onshore tanks, making it possible to use an inexpensive submersible cargo pump to lift cargo from oil spill-preventing tankers. The purpose of this project is to provide a two-stage cargo tanker.

[Means to solve the problem]

In order to achieve the above-mentioned object, the two-stage lifting tanker of the present invention is a tanker having an upper cargo oil tank and a lower cargo oil tank in two stages, upper and lower. Each is equipped with a submersible cargo pump, and the cargo pump in the upper cargo oil tank has a pump lift that can send oil to the onshore tank, or the cargo pump in the lower cargo oil tank has a pump lift that can send oil to the onshore tank. It has a pump lift that is sufficient to lift the cargo oil to the upper cargo tank, and is characterized in that the cargo oil in the lower cargo tank is lifted in two stages via the upper cargo tank.

[For production]

In the above-mentioned two-stage lifting tanker of the present invention, the cargo oil in the upper cargo tank is lifted by the upper cargo pump which has a pump lift that can send the oil to the onshore tank, and the cargo oil in the lower cargo tank is lifted from the lower cargo tank. The oil is first sent to the upper cargo tank by a lower cargo pump having a pump lift capable of sending the oil to the upper cargo tank, and then lifted by the upper cargo tank.

C Embodiment] Hereinafter, a two-stage cargo tanker as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a cross-sectional view of the hull thereof. As shown in Figure 1, a two-stage cargo tanker as a cargo oil spill prevention type tanker has an inboard tank installed at the center in the transverse direction, an upper cargo oil tank 1 and a lower cargo tank 1. In order to prevent cargo oil from leaking outward from the cargo oil tank 1.2, there are horizontal bulkheads 4 dividing the cargo oil tank 1.2 into two. It has a double hull structure with 3 tanks or voids.

The upper cargo oil tank l is provided with a submersible cargo pump 5 for the upper cargo oil tank, which has a pump lift capable of sending oil to a land tank (not shown) via a land tank lift pipe 8. The oil tank 2 is provided with a submerged cargo pump 6 for the lower cargo oil tank, which has a pump lift capable of sending oil to the upper cargo oil tank 1 via the lower cargo oil tank pump v7.

With the above-described configuration, when cargo oil is unloaded, the cargo oil in the upper cargo oil tank 1 is lifted to the onshore tank by the upper cargo oil tank lift pump 5 via the onshore tank lift pipe 8. The cargo oil in the lower cargo oil tank 2 is lifted up by the lower cargo oil tank lifting pump 6 via the lower cargo oil tank lifting pipe 7, and is further transferred to the upper cargo oil tank 1. It is unloaded into onshore tanks in the same way as cargo oil.

Therefore, the cargo pump 6 for the lower cargo oil tank may have a pump lift sufficient to lift cargo to the upper cargo oil tank 1, and the cargo pump 5 for the upper cargo oil tank may also have a pump lift that is sufficient to lift cargo to the upper cargo oil tank 1. Since the depth of the tank is almost halved compared to the case without it, a small lift pump is sufficient, and this makes it possible to equip inexpensive submerged cargo pumps, which were previously not applicable to large tankers. This has the effect of significantly reducing costs.

Additionally, the above configuration is limited to cargo oil spill prevention type tankers.
Similar effects can be obtained even when applied to a liquid storage device having two or more layers of tanks in the depth direction.

〔Effect of the invention〕

As described in detail above, according to the two-stage cargo oil tanker of the present invention, the cargo pump for the lower cargo oil tank only needs to have a small lift to lift cargo to the upper cargo oil tank. A water-type cargo pump is used, and the tank depth of the cargo pump for the upper cargo oil tank is reduced by the amount of the lower cargo oil tank, so only a small lifting capacity is required. In this way, both the lower cargo oil tank and the upper cargo oil tank are equipped with inexpensive submerged cargo pumps, which has the effect of significantly reducing costs.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the hull of a two-stage cargo tanker as an embodiment of the present invention. 1. Upper cargo oil tank, 2. Lower cargo oil tank, 3.
Ballast tank, 4.Horizontal bulkhead, 5.Submerged cargo lift pump for upper cargo oil tank, 6.Submerged cargo pump for lower cargo oil tank, 7.Lower cargo tank for lower cargo oil tank. Pipe, 8...
・Land” Nitank cargo pipe. Agent Patent Attorney Yoshihiko Iinuma Figure 7, 7 a *i, f 2 9-2

Claims (1)

[Claims] In a tanker having upper and lower cargo oil tanks in two stages, each of the upper cargo oil tank and the lower cargo oil tank is equipped with a submerged cargo pump, and the upper cargo oil tank lifts cargo. The pump has a pump lift that can send oil to the onshore tank, but the lift pump for the lower cargo oil tank has a pump lift that can only lift the cargo oil in the lower cargo oil tank to the upper cargo oil tank. The unloading of cargo oil from the cargo oil tank is
A two-stage cargo oil tanker that is characterized by carrying out cargo oil in two stages via the upper cargo oil tank.