Class 2 (2nd Engineer) MEKG 📅 Jul 2018

Exam Question

With regard to care of lubricating oils onboard. answer the following:

(a) What is microbial degradation of lubricating oil and how is it prevented?

(b) What methods are employed to ensure correct sampling for shore-based testing? What action will you take if the testing results show abnormal values of water content and TBN for the crank-case lub oil of a slow speed main engine?

Reference Answer

(a) Microbial degradation of lubricating oil occurs when microorganisms, such as bacteria, yeast, molds, and sulfate-reducing bacteria (SRB), proliferate and decompose the lubricant, making it unsuitable for use. These microorganisms can be either aerobic or anaerobic.
Conditions that Promote Microbial Growth:
Presence of water
Availability of nutrients

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