In the mid 1990's new highly rated Two Stroke Cross-Head engines became available that produced levels of thermal stresses never experienced before by Marine Diesel Cylinder Lubricants (MDCL). This affected some oils more than others and failures occurred with well-known MDCL that had previously provided excellent levels of performance. The main modes of failure were build-up of deposit and scuffing in a very short time. A new series of over-based detergent chemistries has been created that is able to withstand high stress levels and can be used with greater efficiency. To understand the cause of the problems, bench and rig tests have been developed that could been convincingly shown to correlate with the most severe engine operation. The mechanism of failures was thought to be due to breakdown of the detergent micelle when the oil was exposed to extreme conditions for an extended period causing oil film breakdown and adhesive wear. The High Temperature High Frequency Reciprocating Rig was selected to test resistance to these conditions as oils could be exposed to high temperatures and the onset of adhesive wear readily measured. Optimum performance in all areas could not be established with existing chemistries hence new molecules were developed. This development advanced from the test-tube stage through pilot plant eventually to full scale commercial production. Combining these new chemistries with minor components selected to supplement performance led to a range of experimental formulations. In all aspects of the project concern was given to the environmental effects of the new components and the final formulations. Eventually, three candidate formulations were selected and exposed to a raft of engine and rig tests covering all facets of performance required by a MDCL. The overall successful candidate was tested in MAN B&W K 90 and MAN B&W K98 engines and it was shown that the new molecules were able to control wear and cleanliness at a lower oil feed-rate than normal.


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    Title :

    Development of marine diesel cylinder oils


    Additional title:

    Entwicklung von Schmierölen für Schiffsdieselmotoren


    Contributors:
    Garner, Terry (author) / Voss, Lars (author) / Marek, Klaus (author) / Aabo, Kjeld (author)


    Publication date :

    2004


    Size :

    13 Seiten, 15 Bilder, 6 Tabellen, 12 Quellen


    Type of media :

    Conference paper


    Type of material :

    Storage medium


    Language :

    English




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