Optimum drain intervals for gas engine oils
ADDINOL, the German expert for high-performance lubricants, offers an additional service for the application of their tried and tested gas engine oils in biogas plants. Based on lubricant analyses and a special matrix the ADDINOL engineers determine the optimum drain interval of the oil applied in biogas engines.
The operator just provides the necessary data of his engine and cogeneration unit and sends oil samples with the current values to the laboratory. Based on this ADDINOL determines the most efficient, individual oil drain interval. The laboratory reports provide all information on the condition of the lubricant.
They state whether the operating life can be extended or needs to be shortened or if an oil change is necessary. Oil changes are carried out depending on the condition of the oil and the costs are under the control of the operator. In addition, the engines are monitored carefully and safely by the help of substantiated analyses.
Acid products resulting from the combustion process are absorbed by the engine oil and must be neutralised. If they are not neutralised, they attack the gas engine. Therefore it is important to check the gas engine oil regularly. The TAN (Total Acid Number or neutralisation number) indicates the acidification of the oil. The TBN (Total Base Number) shows the content of alkaline components in the oil and gives information on how many acid components can be neutralised. The TBN must always be higher than the TAN. For gas engines operated with gases of varying quality, the i-pH value provides additional information on a possible acidification of the lubricant.
German article published in Biogas Journal 2/2009 (view German article here)