Service allowance (or “sea margin”) applied to trial-condition power to reach design contract - covers weather, fouling, and ageing.
Formula
$$ P_{service} = P_{trial} \cdot (1 + s) $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $P_{trial}$ | Trial power at design speed | kW | sea trial |
| $s$ | Service allowance | - | company policy |
Sources
- ISO 19030-2 Performance Monitoring.