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The total base number is especially needed for cylinder liner lubrication of engines that run on poor quality fuel with high sulphur content. The base additive is used to reduce corrosive effects of sulphuric acid fumes on cylinder.
With large diesel engine installations, lubricating oils are continuously filtered and purified to reduce insoluble particles in oil. Special strainers containing magnets are used to trap particles of carbon or iron particles. In large diesel engines, carbon particles are byproducts of combustion while iron particles comes from rubbing of gears, cams or other parts where wear down still occur.
The presence of these particles interferes with lubrication of bearings, most of which contain soft white-metal coating. The particles can become embedded into soft metal and cause abrasion of metal parts.
The contents of this page are part of a page from my e-book "General Engineering Knowledge Notes" that will help candidates prepare for Marine Certificate of Competency Examinations. This e-book is available for FREE downloading at Engineering Ebooks
Until next time...
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