The Efficient BASicity (EBAS):a method to assess the performance durability of marine cylinder lubricants
As a result of the drastic lowering of sulphur content in HFO or the introduction of LNG fuel, the basicity of future generation Marine Cylinder Lubricants should be decreased provided a high level of neutralization efficiency can be maintained. The efficiency of the neutralization reaction will be a key parameter if specific engine operating modes and future engine designs are more likely to produce acids and therefore more sensitive to corrosive wear. Such protection can be delivered by using innovative ashfree neutralising chemistries to replace the traditional CaCO3 which has been shown to be a poor neutralising agent and prone to generate hard deposits during oil degradation. With the objective to differentiate and quantify this basicity efficient and further to the publication of the Efficient BASicity (EBAS) concept (ISME 2011, paper 528) , we have developed an analytical method, derived from ASTM D4739. The chemical background to this method is described, as well as experimental details, such as repeatability, reproducibility, selectivity and discriminating ability. EBAS is complementary to BN (ASTM D-2896), therefore the two values should qualify the neutralization capability of a finished lubricant. We also report on our in service experience with such methods and our efforts to correlate them with engine reliability. Monitoring 2-stroke engines in service is the way to correlate and couple EBAS/BN with Fe content of drain oils, or to other indicators of engine condition such as the position in the viscosity-basicity diagram (ISME 2011, paper 529) .
Catherine AMBLARD Serge ESSON
TOTAL Marketing-Services,FRANCE
国际会议
上海
英文
1-12
2013-05-13（万方平台首次上网日期，不代表论文的发表时间）