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Justification of Ballast Tank Parameters of a Mоbile Berth for Timber Transshipment

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S.V. Posypanov, V.O. Chuprakov

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The use of a mobile small-sized berth, the design of which was proposed by the authors in the previous paper, significantly increases capacity and reduces the cost of timber transshipment. When towing the berth over large distances, its ballast tanks are empty, which ensures that draft and water resistance to movement are minimized. At the point of operation the leveling ballast tank is filled with water until the top surface of the berth is leveled. In this position, the berth is moved locally in case of significant changes of the water level in the reservoir. Due to manufacturability and minimization of the volume of the leveling tank, it is designed as a part of the inner space at the berth stern, separated by a vertical wall. The permutation ballast tank is filled with water to submerge the berth until it leans on the leveled coastal slope. Water is pumped out of the tank to make the berth float during its local permutations. In this case, a significant trim should not be allowed. The lower point of the longitudinal section of the permutation tank was provided at the intersection of the berth bottom and the vertical, which bisects the waterline upon completion of the alignment. Algorithms have been developed for determining the position of the vertical wall of the leveling tank and the position and shape of the walls of the permutation tank. The distance of the vertical wall from the lower point of the berth and the coordinates of the points of the profiles of the left curved and right walls of the permutation tank were determined for a conditional berth of unit height and width. The coordinates were used to derive empirical dependencies. The values of the calculated metacentric heights verified the longitudinal and transverse stability of the berth in all positions. Experimental validation on a physical model of the berth confirmed the correctness of the results. Transition to the correct dimensions of the longitudinal profile from the conditional is assumed with the proportions retained.
This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) license • The authors declare that there is no conflict of interest


Sergey V. Posypanov, Doctor of Engineering, Prof.; ResearcherID:ABF-6542-2021, ORCID:
Vyacheslav O. Chuprakov, Postgraduate Student; ResearcherID: ABF-4113-2021, ORCID:


Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; e-mail:


round timber, mobile berth, shipping, timber loading, ballast tanks

For citation

Posypanov S.V., Chuprakov V.O. Justification of Ballast Tank Parameters of a Mobile Berth for Timber Transshipment. Lesnoy Zhurnal [Russian Forestry Journal], 2022, no. 1, pp. 143–154. DOI: 10.37482/0536-1036-2022-1-143-154


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