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Lube TBN - Depletion Rate

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Cylinder-oil TBN depletion rate based on fuel sulphur content and feed rate - the basis for selecting 40/70/100/140 BN grades.

Formula

$$ BN_{req} = \frac{m_S \cdot 2 \cdot M_{KOH}}{M_S \cdot \dot m_{oil}} $$

Symbol legend

SymbolMeaningUnitSource
$m_S$Sulphur mass per kWhg/kWhfuel analysis × SFC
$\dot m_{oil}$Cylinder-oil feed rateg/kWhengine setting

Sources

  • ExxonMobil Mobilgard Bulletin - TBN.