Optimal bunker-stem size given ROB, differential price between the current and next port, and safety margin - the basic lift/leave split that underpins bunker-economics routing.
Formula
$$ L = \max(c \cdot (d + s) - \text{ROB},\ 0) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $c$ | Daily fuel consumption | t/day | previous voyage average |
| $d$ | Voyage duration | days | passage plan |
| $s$ | Safety margin | days | company policy |
| $ROB$ | Remain on board | t | tank soundings |
Sources
- BIMCO Bunker Terms.