What is an In-Service Sea Trial for EEXI?
An In-Service Sea Trial is a practical measurement at sea used to accurately determine the reference speed and performance power of a vessel. This data is essential for calculating the Energy Efficiency Existing Ship Index (EEXI).
After the introduction of the EEXI regulations, many shipowners are looking for ways to comply with the requirements without unnecessary operational limitations. By conducting an In-Service Sea Trial, a realistic speed-power curve can be established. In some cases, this can lead to less strict Overridable Power Limitation (OPL) requirements, allowing operational flexibility to be maintained.
Normec Verifavia supports shipowners in planning, executing, and analysing these measurements, ensuring the results are reliable and suitable for EEXI calculations and class acceptance.
Important technical considerations
For a reliable In-Service Sea Trial, several technical conditions must be respected.
Trial conditions
The sea trial must be conducted under controlled conditions in accordance with ISO 15016:2015. This includes, among others:
- Calm sea
- Minimal wind
- Predefined draft
Data collection
During the sea trial, accurately calibrated instruments are used to measure, among other things:
- Vessel speed
- Engine power
- Fuel consumption
- Operational parameters
Data analysis
Our specialists analyse the collected data to develop a reliable speed-power curve that is recognized by classification societies.
EEXI calculations
The validated curve is then integrated into the EEXI calculations, which may lead to reduced OPL requirements.
Our approach
At Normec Verifavia, we combine technical expertise with practical experience to organize a reliable and efficient sea trial.
Our approach includes:
- Preparation of a customized test plan
- Execution of the sea trial according to international standards
- Accurate data collection and monitoring of performance parameters
- Analysis of the results and development of a speed-power curve
The results are then used in the EEXI calculations and can be verified by classification societies.
An In-Service Sea Trial offers several benefits for shipowners and operators:
- You obtain an accurate speed-power curve for EEXI calculations
- You may be able to reduce stricter OPL limitations
- You gain better insight into the actual performance of your vessel
- You support more efficient operational planning and fuel strategy
- You demonstrably comply with international measurement standards
Normec Verifavia's expertise
Normec Verifavia has extensive experience in maritime emissions regulations and energy efficiency analysis. Our team has already supported more than 500 vessels with EEXI compliance.
In addition to In-Service Sea Trials, we also provide support with:
- EEXI calculations
- CFD simulations
- OPL solutions (EPL and ShaPoLi)
- EU MRV and EU ETS verification
- IMO DCS and CII compliance
Thanks to our technical expertise and international presence, we can organize efficient and reliable sea trials.
Would you like to know more about an In-Service Sea Trial for EEXI compliance?
Frequently asked questions
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A sea trial can be useful when a vessel wants to achieve EEXI compliance with fewer operational constraints, for example by establishing a more accurate speed to power ratio.
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Trial runs are generally performed according to ISO 15016:2015, the international standard for measuring ship performance.
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The parameters measured during the sea trial include the following:
- Speed of the vessel
- Engine power
- Fuel consumption
- Operating conditions
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Yes. By establishing a more accurate speed-power curve, it may be possible to apply less stringent OPL settings in some cases.
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The sea trial itself usually lasts from one to several days, depending on the availability of suitable weather conditions and the vessel's operational schedule.
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The lead time depends on several factors such as vessel availability, weather conditions, and the complexity of the test plan. Normec Verifavia works closely with you to plan and execute the sea trial as efficiently as possible.
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External factors such as weather and sea conditions can affect data collection. Thanks to Normec Verifavia's technical expertise, these effects are minimized through careful planning, accurate measurements and thorough data analysis.
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CFD analysis can provide valuable insights but is not suitable for vessels with a retrofit of Low Friction Hull Coatings. In such cases, speed-power curves obtained from Sea Trials are the only valid solution for accurate performance analysis.
Costs vary depending on several factors, such as:
What are the costs of an In-Service Sea Trial?
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1.
The scope of the sea trial
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2.
The vessel type
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3.
The location of the Sea Trial
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4.
The required level of detail of the analysis
Normec Verifavia offers transparent pricing and tailor-made solutions that match your operational needs and budget.