GB/T 30007-2022 in English
VALIDShips and marine technology—Guidelines for the assessment of speed and power performance by analysis of speed trial data
- Issued on:2022-10-12
- Implemented on:2022-10-12
- File Format:PDF
- Delivery:Via email within 10 business days
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《GB/T 30007-2022船舶和海上技术 通过分析测速试航数据以确定速度和功率性能的评估导则》由TC12（全国海洋船标准化技术委员会）归口，TC12SC7（全国海洋船标准化技术委员会船舶理论与实验分会）执行，主管部门为国家标准化管理委员会。
Introduction
Interpretation of the core content of the standard
Scope of application and definition of terms
This standard applies to the speed/power trial of displacement ships and specifies the complete process from trial preparation to result reporting. Key terms include:
- Contract speed: ship speed specified in the new construction/construction contract
- EEDI speed: load state under the energy efficiency design index verification conditions specified by IMO
- Round trip: consecutive voyages with the same power in opposite headings
Sea trial boundary condition requirements
| Environmental factors | Limitations | Correction method |
|---|---|---|
| Wind speed | ≤ Beaufort 6 (ship length>100m) | Appendix C Wind resistance correction |
| Wave height | H1/3≤2.25LPP/100 | Appendix D Wave resistance increase |
| Water depth | h≥max(3B·TM,2.75VS2/g) | Appendix G Shallow water correction |
Key correction method
Direct power method process
- Measured speed (VG) corrected by iteration method/average method
- Calculate the total resistance increase ΔR=RAA+RAW+RAS
- Correct the propulsion efficiency using load factors (ξP,ξn,ξV)
- Convert to contractual status through power ratio αP
Example: The shaft power of a bulk carrier was measured to be 14,500kW during sea trial. After wind and wave correction, the ideal power is 13,820kW. The speed correction value ΔV=0.12kn.
Implementation points
- DGPS positioning accuracy needs to reach differential mode
- torque measurement system deviation needs to be <1%
- hull/propeller cleaning inspection is required before sea trial
- sister ship can be simplified to 3 round trips
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