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Charchalis Adam and Krefft Jerzy

Economizer Selection Method with Reference to its Reliability at Preliminary Design Stage of Seagoing Vessels

The economizers are used for production of steam heating on en route ships. The economizers are producing steam in a heat exchange process from the ship's main engine exhaust gas. Products of the incomplete combustion of the heavy fuel oil remaining in engines, passing the boiler, collect on the heat exchange surface of the economizer. When the incorrect assumptions are made for the boiler operation conditions, the boiler steam capacity drops and fire and burning of the incomplete combustion products can occur in the economizer. To minimize combustion product quantity that collects on the boiler surface, the allowable exhaust gas pressure drop in the boiler should be taken into consideration, as well as the results from recommended exhaust gas flow velocity that is determined by main engine service load determined in the preliminary design phase of the ship. The remaining operating conditions are made in such a way to obtain high steam capacity of the boiler. It is essential at the design stage to take into consideration the future operating parameters of the combustion-steam-water installation, since these parameters depend on the choice of boiler and determined at the design stage production of steam. On the basis of operation parameters of contemporary container ships, an attempt was made to select economizer capacity in the preliminary design stage taking into consideration operation conditions of the propulsion system-steam installations unit in aspect of economizer reliability.

Open access

Adam Charchalis and Rafał Pawletko

The Use of Expert System for Marine Diesel Engine Diagnosis

The paper presents a diagnostic system for marine diesel engine based on an expert system model. The research relevant to knowledge acquisition for this system was done, knowledge data set was built and general structures of the expert system was proposed. Basic sources of knowledge which can be used for construction of knowledge data set are also identified. The basic knowledge related to the diesel diagnostic was undertaken from experts and diagnostic data base. The paper questionnaire was used to the knowledge acquisition from experts. The basic knowledge related to the marine diesel exploitation was undertaken. The rule induction algorithms was used to knowledge acquisition from data base. During the experiment efficiency of LEM induction algorithms was compared to new MODLEM and EXPLORE algorithms. Training and test data were acquired from experiment on marine engine Sulzer 3AL 25/30.

Open access

Adam Charchalis, Robert Starosta and Wojciech Labuda

The Influence of Burnishing Parameters on the Roughness, Plastic Strain and Shape Deviations of Marine Pumps Crankshaft Pins in Fresh Water Installations

Angular momentum pumps are frequently applied in marine installations. Due to hard working conditions of these pumps, special corrosion wear resistant materials as well as the ones resistant to electrochemical corrosion caused by sea water are used for their production. In case of pump shafts the most frequent inefficiency is the pin wear (corrosive wear, friction wear and contact wear) in place of sealings assembly (throttle). Burnishing as finish plastic tooling method enables obtaining machine elements of proper technological quality. Bearing in mind numerous advantages of using burnishing, it is suggested to apply it instead of machining (finish turning, grinding, polishing) to the shafts of marine angular momentum pumps.

The burnishing process was carried out by SRMD single roll burnishing tool by Yamato. The object of the paper was to determine the influence of burnishing parameters and the number of burnishing tool passes on the improvement of roughness, plastic deformation and the shape deviation of marine pumps crank pins.