Ship

Abstract

[Problem] To provide a ship for which the amount of ballast never becomes excessive even under light-load and severe weather conditions. [Solution] A cargo hold (2) is divided into cargo-exclusive spaces (21) to be used solely for carrying cargo and a ballast-exclusive space (22) to be filled only with ballast water. Additionally, the ballast-exclusive space (22) is constructed so as to satisfy a heavy ballast condition, which is sometimes required by ship class rules, under severe weather conditions.

Description

technical field [0001] The present invention relates to a ship, in particular to a ship provided with a plurality of cargo holds. Background technique [0002] A ship with multiple cargo holds, such as a bulk carrier, is a ship that mainly transports bulk cargo such as wheat and other grains, coal, iron ore, and cement. This type of ship is mostly sailing with counterweight under no load in single voyage. Therefore, a bulk carrier or the like generally has a ballast tank as described in Patent Document 1. In Patent Document 1, the hull structure of a bulk carrier having a double bottom, bottom tank, and side top tank is described, and the double bottom, bottom tank, and side top tank are used as ballast tanks, and these ballast tanks are filled with Weighted water (sea water). [0003] Usually, when lightly loaded, only the ballast compartment promises to be filled with water for sailing. However, the volume of the ballast tank is mostly set so that the bow, bottom and p...

AI Technical Summary

Problems solved by technology

[0010] (1) Since it takes a lot of time until the ballast combined cargo tank is filled with ballast water, the power consumption of the ballast pump or ballast water treatment device will also increase

In addition, in the case of sailing when stormy weather is predicted, it is necessary to start filling water in advance

This is because when sailing in a stormy weather without filling the ballast water, the sloshing (sloshing) of the ballast water due to the shaking of the hull will reduce the resilience or damage the ship

[0011] (2) As the hull becomes heavier than necessary, the speed of the ship will decrease, the sailing schedule will be delayed, and additional energy such as fuel will be required, which will reduce efficiency

The larger the counterweight cargo hold, the more manpower and man-hours are required for cleaning, and the longer it takes to load

[0013] (4) Due to the action of an excessive amount of counterweight water, the hull produces a greater bending moment, therefore, more firm reinforcement is required, and the weight of the hull will increase

The increase in the weight of the hull causes the speed of the ship to decrease and the fuel to increase, leading to a deterioration in efficiency

[0014] (5) In general, the airtightness of the cargo compartment is required. Therefore, in the counterweight dual-purpose cargo compartment, the air supply and exhaust ports that are usually installed in the counterweight compartment for air entry and exit are not provided.

Therefore, when filling and draining water, in order to allow air in and out of the counterweight double-purpose cargo compartment, the ventilation door of the hatch cover must be opened, which requires manual operation.

In addition, in case of forgetting this operation, there is a possibility of damage to the hatch cover or the inner wall

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