Repair and reliability of river service ships

Baryshnikov, Sergey; Karklina, T.O.; Chistov, Valentin B.

doi:10.54068/00394580_2021_1_10

Cited by 3 publications

(1 citation statement)

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“…В результате выполненных расчетов с применением новой Инструкции доказано, что число измерений остаточных толщин элементов путем проведения предварительного этапа дефектации корпуса можно существенно сократить. В работах [1]- [3] доказано, что использование вероятностного подхода, предусмотренного новой Инструкцией, гарантирует 95 %-ю достоверность прогнозирования уровня общей и местной прочности.…”

Section: обсуждение результатов (Results and Discussion)unclassified

Forecasting the volume of defect detection works on a river fleet vessel hull

Krasiuk

2024

jour

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The issue of using the new Instruction for defect detection of hulls of vessels for river and mixed (riversea) navigation to predict the number of measurements of hull structures during the subsequent regular survey is discussed in the paper. The electronic version of the defect detection report tables provided for in the Instruction allowing the necessary calculations to be performed is taken into account. At the moment, defect detection of a ship hull is the examination, measurement and assessment of defects in each element of the ship's hull in order to establish method and volumes of repairs that ensure its reliable operation until the next regular survey under specified operating conditions. However, the application of the new Instruction will not allow us to measure every element of the ship's hull, but only those elements whose measurement is necessary. An algorithm for filling out the defect detection report tables in their electronic version is provided in the paper, and the need for a preliminary (calculation) stage of defect detection, which is essentially an analogue of the concept of the zero stage in ship repair, is substantiated. The preliminary stage of defect detection is based on a probabilistic approach to predicting the residual thicknesses of individual ship's hull elements using known wear rates and data from ship's hull defects detection performed previously. The results of calculations of a test example for a representative vessel, for which detailed information both on the hull constructions and on the results of measurements during the previous survey and repair is available, are presented. Using the test example, it is proven that introduction of the preliminary stage of defect detection process will reduce number of measurements of hull structures by 78 % compared to the traditional approach to performing the detection work. The necessity of development at the preliminary stage not only electronic table, but illustrating maps of measurements of the main hull structures, examples of which are given, is substantiated.

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Section: обсуждение результатов (Results and Discussion)unclassified

Forecasting the volume of defect detection works on a river fleet vessel hull

Krasiuk

2024

jour

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Optimal Fault Detection of River Ship Hulls

Baryshnikov

Krasiuk

Chistov

2022

jour

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The issue of determining the reliability of the hulls of inland and river-sea-going vessels after a known number of years of operation under given condition is considered. It is accepted that fault detection of a ship’s hull is a survey, measurement and evaluation of defects in each element of the ship’s hull in order to establish the methods and scope of repairs that ensure its reliable operation until the next regular survey under specified operating conditions. It is shown that the volume of residual thicknesses can be significantly reduced using the statistical data on wear rates presented in the Rules of the Russian River Register. At the same time, the reduction in the scope of measuring the parameters of defects retains the probability of detecting all defects of the hull elements to the level of 0.95, and the probability of failure-free operation of the hull until the next survey, after the elimination of the identified defects will be at least 0.95. A form of table for processing the values of the residual thicknesses of all elements in the inspection report and instructions for filling it out are given. Explanations for using the results of measurements and calculations at determining the technical condition of certain elements in the group and the ship’s hull as a whole are given. The last column of the table indicates the method of eliminating the defect of an element and groups of elements, and in the conclusion of the inspection report, the method of repair and its scope for the entire hull of the ship providing a suitable assessment of the condition after repair are indicated. The main advantage of this paper, in difference from the previous studies of the authors in this area, is that user-friendly (the designer of the defect report tables) nomograms, which allow you to reduce the number of measurements of the residual thicknesses of hull structure elements in the online mode, have been created. The performed study, allowing you to reduce the number of measurements while guaranteeing the reliable operation of the ship’s hull, will let the shipowner to reduce the cost of repair work by reducing the number of days of ship standing on the slipway (in the dock). In addition, the ship repair company will be able to free up its production facilities for the purpose of their subsequent loading with other ship repair or shipbuilding orders, which will increase the efficiency of their activities.

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Reliability of river fleet vessels hull elements

Krasiuk,

Chistov,

Nikifirov

2024

jour

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Improving the process of fault detection of metal ship hull elements by using a probabilistic approach is considered in the paper. The most labor-intensive part of the defect detection report, namely, measurement and assessment of hull structures individual elements wear, accounting for more than 90 % of the total measurements, is reviewed. Defect detection of a ship hull means the examination, measurement and assessment of defects in each element of the ship hull in order to establish method and volumes of repairs that ensure its reliable operation until the next survey under specified operating conditions. The necessity of carrying out a preliminary calculation stage for defect detection is substantiated. It allows you to significantly reduce the number of measurements of hull structures elements, which will have a positive effect on reducing the cost of repair both due to a smaller number of measurements and the duration of repairs. It has been proved that using the probability approach to predict the residual thickness of individual elements also takes into account the effect on the total strength, which guarantees the reliability of the ship hull in operation. Tables to assess the technical condition of individual hull elements based on their level of wear have been developed, and a method for filling them has improved. The tables are made in two versions, namely, paper and electronic, the most convenient for a specific user — the designer of the defect detection report tables. A test example of using the electronic tables for assessing technical condition by wear level, which proves that the predicted residual thicknesses obtained by calculation will in all cases, be less, than similar ones obtained from measurements results, is carried out using a representative vessel. This proves the reliability and feasibility of using the preliminary defect detection stage, which is essentially an analogue of the concept of the zero stage in ship repair. Using the probability approach to determine the residual thicknesses will allow you not only to reduce the costs of defect detection of the hull itself, but also at early stages (before placing the ship on a slip or dock) to reduce the volume of hull structures repairs, and to choose the most appropriate and effective method of repair.

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Repair and reliability of river service ships

Cited by 3 publications

References 0 publications

Forecasting the volume of defect detection works on a river fleet vessel hull

Forecasting the volume of defect detection works on a river fleet vessel hull

Optimal Fault Detection of River Ship Hulls

Reliability of river fleet vessels hull elements

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