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
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $m_S$ | Sulphur mass per kWh | g/kWh | fuel analysis × SFC |
| $\dot m_{oil}$ | Cylinder-oil feed rate | g/kWh | engine setting |
Sources
- ExxonMobil Mobilgard Bulletin - TBN.