Welding of small-diameter pipelines made of carbon and low-alloy steels is highly demanded in various industries. However, there is practically no scientific literature covering all methods of welding of such pipelines. This article analyzes the available literature, as well as the authors' own developments. The survey showed the most common non-consumable electrode welding technology in inert gases. The main points of non-consumable electrode welding technology in inert gases, as well as the development of welding of small-diameter pipelines from carbon and low-alloy steels, are presented and structured.
The article discusses the use of polymer composite materials in the manufacture of ship ventilation pipelines. In this article, the author gives the features of manufacturing technology of ship pipeline production with different designs from composite materials.
The article presented the use of composite polymeric materials to increase the effectiveness of ship ventilation systems in the process of its machining. As the result of the research, the author considered that, it is important to evaluate and anticipate all possible factors (technical, technological, ergonomic, environmental) associated with the negative impact of excessive production waste generation (chips and dust) in the workplace at the design stages of technological processes for machining parts made of composite materials. The research results determined the possibility of using composite polymer materials for manufacturing the structures of ship ventilation systems, as well as other ship systems.
In the article, the authors examine the problem of enhancing the technological features of ship’s pipeline systems at the designing stage. Moreover, it introduces the solutions for questions of ship pipeline’s manufacturing and assembling without measuring the actual size of the ship. The possibility of using the rotating method for paralleling pipe sections simultaneously with technical operation of removing the technical allowances of the pipelines is taken into consideration to fully compensate the total deviations of pipelines routes, which was arisen not only in process of pipes’ manufacturing but also in hull, mechanisms, and equipment’s assembling. An algorithm for determining the compensation level of the pipeline route is established. Based on the results of the researching process, the method to determine the compensation possibilities of pipeline routes and values of technical allowances is established, which was appointed on fitting pipes for expansion in the compensation field in possible directions. The author presents the method of pipeline displacement by using the rotation method to rotate the parallel sections of the pipelines for compensating total deviations, and the technology of assembling the pipeline systems from prepared pipes, which was produced by designing information without measuring the actual size of the ship.
In this paper, the solutions for problems related to increase in manufacturability of pipelines at a design stage were stated. The authors considered conditions and possibilities for compensating deviations of the pipeline route and adjacent structures during pipe installation. The task was set to produce a fitting pipe according to the design information without specifying dimensions and configuration in place on the ship. The fitting pipe was manufactured according to the design information with the assignment of technical allowances at the end sections in certain directions, if necessary. Moreover, the authors presented a method for compensating deviations in the routes of ship pipelines using rotations of pipe parallel section pairs, and developed the procedure for compensation and installation of pipelines from prefabricated pipes manufactured according to design information without specifying dimensions on the ship. Mathematical and graphic modeling of deviation compensation in pipelines during their installation was performed.
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