Error in net cargo quantity from a 1 °C mis-read temperature or 1 kg/m³ density mis-report, at a typical ullage gauge - the drivers of ship-to-shore figure disputes.
Formula
$$ \Delta V = V \cdot \alpha \cdot \Delta T, \quad \Delta m = V \cdot \Delta\rho $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V$ | Cargo volume | m³ | ullage calc |
| $\alpha$ | Volumetric expansion | 1/°C | ASTM D1250 Table 54B |
| $\Delta T$ | Temperature reading error | °C | calibration spec |
| $\Delta\rho$ | Density reading error | kg/m³ | densitometer spec |
Sources
- ISO 4266 / OCIMF closed gauging.