Class 2 (2nd Engineer) MEKG 📅 Jan 2017

Exam Question

With regards to care of lubricating oils onboard, answer the following:

(a) Microbial degradation of lubricating oil and measures to prevent the same

(b) Methods of ensuring correct sampling is done for the purpose of shore-based testing

(c) If the shore-based testing results show abnormal values of water content and TBN for the crankcase lube oil of a slow speed main engine, what will be interpretation and subsequent action.

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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