Class 2 (2nd Engineer) MEKG 📅 Jun 2019

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? What methods are employed to ensure correct sampling for shore based testing?

(b) 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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