Of the many impurities commonly found in marine lubricating oil, which of the following CANNOT be removed by a centrifugal purifier at normal operating speeds and temperatures?
⢠Density difference and how a centrifugal purifier separates contaminants based on specific gravity ⢠The relative densities of lube oil, water, fuel, metal particles, and carbon at normal operating temperatures ⢠The effect of particle size and emulsification on what a purifier can and cannot separate
⢠Think about which impurity has a density and behavior in oil that is too similar for a centrifugal purifier to separate efficiently at normal temperature. ⢠Ask yourself: which of these contaminants is usually removed by filters or chemical treatment rather than by a centrifugal purifier? ⢠Consider which contaminants form a distinct heavier or lighter phase compared to lube oil, making them easier to throw out with centrifugal force.
⢠Verify which impurities are heavier than lube oil and tend to move outward in a centrifuge bowl. ⢠Verify which impurity is miscible with lube oil and may not form a separate layer at normal purifier operating conditions. ⢠Check which contaminants are typically listed in engineering texts as being handled by purifiers vs. by strainers/filters.
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