Correct observed ullage reading for cargo-to-tank temperature difference using ASTM D1250 volume-correction factor - the fundamental step in ship-to-shore ullage reconciliation.
Formula
$$ U_{15} = \frac{U_{obs}}{\text{VCF}(\rho_{15}, T_{obs})} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $U_{obs}$ | Observed ullage | m | UTI tape |
| $\rho_{15}$ | Density at 15 °C | kg/m³ | density meter |
| $T_{obs}$ | Observed temperature | °C | portable PT100 |
Sources
- ASTM D1250-19.