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ASSESSMENT AND ANALYSIS OF SELECTED MAIN ENGINES CYLINDER LINERS AND PISTON RINGS WEAR PROCESS
Abstract
Assessments conducted by the various failures analytical groups shows that failures of cylinder liners, piston rings and pistons all related to combustion chambers share the highest proportion every year in Marine Main Engines failure statistics by component part, conversely, excessive wear of cylinder liners and piston rings of Main Engines and problems associated with scuffing have frequently occurred. To solve these problems, it is necessary to conduct analytical assessments on a variety of data such as actual engine outputs, engine revolutions, feeding rates of cylinder oil, which differ from ship to ship to identify wear factors and to obtain trend survey and to, Collated and analyzed the wear records of cylinder liners and piston rings of the main engines installed in various selected ships on the basis of the measurements at main engine pistons drawing out measured during Dry DockпїЅs Main Engine overhauls have been presented in the paper. Along with the recent development of innovative cylinder lubrication systems and new generation of Cylinder Lubrication Oils efforts are being made to reduce cylinder oil feeding rates but without paying due regard to inherent differences among various engine types and sizes, the typical operating conditions of various types of engines : piston speeds, output ranges, etc., service lives of cylinder liners and piston rings. Specifically adjusted cylinder oil feed rate for each Main Engine can reduce number of cylinder liners pistons and piston rings failures and reduce total cylinder oil consumption . It is important in a view of Energy Conservation and proper management of marine power plant to minimize vesselпїЅs operation costs.
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