THE FORMATION OF THE CONTAINER VESSEL LOADING PLAN

Abstract

The paper considers the location of containers when loading the ship taking into account the sequence of ports of unloading to provide access to the required consignments, as well as the fact that the intermediate states of loading the ship when passing between ports must meet the requirements of its maritime safety. Therefore, a method of forming a plan for loading a container ship, which provides for the placement of containers in the cargo space, which meets the requirements for landing, stability and overall longitudinal strength of the vessel. Expressions have been given to calculate the increments of static moments relative to the axes of the vessel, which arise as a result of receiving batches of containers for loading the vessel. It is noted that as a result of containers loading, the trim of the vessel should be in the range from 0 to -2,0 m. From the specified interval the trim which corresponds to placement of containers satisfying requirements of longitudinal durability has been chosen. Therefore, for loading the vessel, procedures for determining the limit values of the moments that provide the ship's trim from 0 to -2.0 m have been considered. To do this, the formulas for calculating the average weight of the batch of containers located in each of the cargo spaces designated for loading batch containers have been obtained, and expressions for determining the weight of cargo in each cargo space depending on its location along the length and height of the vessel. The procedure of joint consideration of the containers placement of different batches of loading the vessel on the parameters of landing, stability and overall longitudinal strength of the vessel has been considered. To do this, the component of the required static moment has been determined depending on the share of the weight of the party in the total weight of the vessel. To confirm the correctness of the suggested method with the help of a computer program, it was calculated to load the ship "Sky Jameni", which can accept containers in eight holds and on their hatches. The vessel is characterized by a maximum average draught of 13.0 m and a maximum displacement of 68,318 tons. The loading plan of the above-mentioned vessel has been formed with the help of the developed program by three container parties. The first container party includes 1900 containers weighing 28800 tons and it has been loaded in 10 cargo holds; the second one consists of 600 containers weighing 9000 tons, has been located in four holds, and the third one weighing 7200 tons and consists of 552 containers has been located in three holds. The considered loading satisfies the requirements to maintain the seaworthiness of the container carrier.