Abstract: In this article, there are presented problems of tribological wear occurring in slow speed diesel engines elements such as piston – piston rings – cylinder liner assembly and fuel injection pumps caused by use of poor quality fuels. There are defined specific quality standards for bunkered marine residual and distillate fuels with accordance to ISO Standard 8217:2010 and recommended by engine maker’s fuel quality at engine inlet. Moreover, there are characterized common contaminants in this fuels with special attention to the most harmful the residual fuel catalytic particles so-called Cat-Fines, specified the maximum limits and described their influence on engine’s tribological pairs. Furthermore, this paper considers the operational precautions and treatment of poor quality fuels with elaboration of specific procedures to prevent and reduce the influence of Cat-fines to tribological wear in engine elements containing issues of fuel oil storage and distribution on board, fuel oil treatment, usage of poor quality fuels and condition monitoring of engine elements.
Abstract: On the grounds of the inspections performed and the results of metallographic tests, the causes of pitting corrosion of combined, auxiliary oil-fired boiler were described in this paper. The boiler generated saturated steam. The methodology and the scope of the carried out tests are indicated, photographs are included as well as the description of damages and documentation regarding the metallographic tests. Conclusions which arose from the abovementioned tests and operational recommendations for engine crew were developed.
Abstract: The role of powdery fractions of rapeseed meal in the development of wear and destruction of cargo handling systems was showed. The physicochemical characteristic of rapeseed meal was studied. The results of research on the participation of powdery fractions in the wear of tribological nodes were presented. It has been found that the presence of the fraction containing the pieces of seed coat accelerates erosion processes. The smallest fractions < 75 μm stabilized the oil film and can reduce the intensity of wear of the friction. The role of powdery fractions in the initiation of dust – air mixtures explosion was presented.
Abstract: The article addresses issues of wear selected port facilities in the conditions of the occurrence of dusty fraction of bulk cargoes on examples of coal and iron ore. Presented in the article results basis on simulation studies on the laboratory stand "pin-on-roll" for the conditions of pollution of lubricants dust loads, taking into account the impact of the simulated marine environment containing corrosive saline mist.
Abstract: The article presents results of long years operational research of the real object localized in the maritime port. The aim of research was the identification of phenomena occurring between grain cargoes and handling equipment. The properties of grains and related products make, that in devices for internal transport systems take place the phenomena of intense erosive wear. The corrosive phenomena, typical for moist environment in the port; additionally speed up the destruction of the steel elements of internal transport system inside the grain silos. There has been discussed the main mechanisms of wear, indicating the fundamental role of the corrosive - mechanical processes. The results of studies of selected properties of grain products, affecting the intensity of the wear of materials of the handling facilities in the port grain elevator have been presented in the article, as well.
Abstract: Copper alloys due to their very good corrosion properties are often used to a fabrication of components that are subjected to both a cavitational destruction and a corrosive action of an environment, e.g.. ships’ propellers, sliding elements, pump parts etc. The course of cavitational destruction depends mainly on a material’s structure (a grain size, a type of inclusions, morphology and phase distribution, etc.) but also on the load distribution, and a possible activity of chemical, electrochemical and thermal processes near cavitation bubbles. Properties of a material that is subjected to the cavitational damage are strongly affected by its structure formed upon manufacturing or applied processing. In the present paper, results of the cavitational resistance analysis of CuZn10 alloy in the as cast state (the grain size of 200 μm) and after thermomechanical processing (the grain size of 10 or 200 μm) evaluated on vibrational laboratory stand in accordance with ASTM G-32 standard, are shown.
Abstract: Evaluation of cavitation erosion resistance of is carried out by using various testing stands, that differ by the way of cavitation excitation and its intensity. These various testing conditions have led to a standardization of some part of laboratory stands, that in turn allows a direct comparison of results obtained in different laboratories. The aim of this study was to determine the course of cavitational destruction of MgAl2Si alloy samples tested on three different laboratory stands. The research was conducted on a vibration stand according to ASTM G32, where cavitation is forced by the vibrating element; in the cavitation tunnel reflecting actual flow conditions, and on a jet impact stand- simulating the impact microjet in the final phase of the cavitational bubbles implosion. Each laboratory stand has given a different course of cavitational destruction.
Abstract: A method for quantitative determination of wear and tear of machines’ elements in the scope of endoscopic tests using artificial and reference bases as point of machine parts are presented in this paper. The proposed method allows also for determining the shape and form of the operated parts, since locating artificial bases in a few points on the circumference, in one plane, allows the form of the tested part to be determined. To use artificial base in which relevant reference bases, demonstrating that a certain dimension has been reached, are included.
Abstract: Currently, guidelines for safely loading shipping containers with heavy cargo in the gooseneck tunnel region do not exist. This work investigates the influence of the construction type of the gooseneck tunnel on the strength of the floor of the shipping container. The main objective is to develop guidelines for loading shipping containers with heavy cargo in the gooseneck tunnel region. This paper investigates strength of the floor using finite element method. The finite element analysis shows how the container's floor responds in the given loading scenarios.
Abstract: In this article indicated the need to include additional hoisting and lowering phases of containers in the ship’s hold between cell guides. This necessity comes from literature studies and long years observations of real container handling processes in seaports. This gave the basis to discussions on the necessity of introducing models in additional phase describing the processes of container handling, what will have the impact on much more precisely way to describe a real object. In addition, this paper presents issues concerning the identification of hoisting and lowering processes on the base of handling of containers into the ship’s hold from the point of view of correlation hoisting speed in relation to the security of the hold, crane and cargo placed inside the container.