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1. EEXI Calculation

Check whether a ship has attained EEDI or not.
Attained EEDI was calculated for a ship for which the building contract is placed on or after 1st January 2013 or the delivery of which is on or after 1st July 2015.*

Assessment of options for a ship to comply with EEXI:

  • Engine Power Limitation (EPL)
  • Shaft power limitation (SHAPOLI)
  • Energy Saving Devices (ESDs)
  • Alternative Fuels
  • Hydrodynamics (propeller optimization):
  • Comparison of different improvement solutions
  • Calculation of speed loss (new Vref)

*In the case of LNG carrier ship and cruise passenger ship, the building contract is placed on or after 1st September 2015, or the delivery of which is on or after 1st September 2019.

2. Computational Fluid Dynamis (CFD)

For the calculation of the Energy Efficiency Existing Ship Index (EEXI), it is necessary to determine the reference speed (Vref) at the scantling draft of the vessel. For many existing vessels subjected to EEXI, speed power curves at scantling draft are not available. Therefore, the EEXI calculation guidelines introduce the option to calculate the reference speed using an approximate formula for the ship type and installed power. This approach includes a margin factor of 5% and consequently, this approximated reference speed is conservative.
The EEXI rating can be improved by determining the Vref from model tests or new sea trials. However, building a new model to scale and conducting towing tank tests only for the purpose of evaluating the effect of improving the Vref is unreasonably expensive and time-consuming. Thus, virtual tank tests, with Computational Fluid Dynamics can provide results at the same level of reliability as model tests.

3. CII Calculation

  • A description of the methodology that will be used to calculate CII
  • Required annual operational CII for the next 3 years
  • Implementation plan documenting how the required annual operational CII will be achieved
  • A procedure of self-evaluation and improvement
  • Introduction of a rating mechanism linked to the operational carbon intensity indicators (CII)

4. SEEMP I, II, III

A Ship Energy Efficiency Management Plan (SEEMP) is a ship-specific plan to improve the energy efficiency of a ship. All ships 400 gross tonnage (GT) and above engaged in international voyages must develop and keep on board a SEEMP, as set out in the guidelines adopted by the IMO. The SEEMP may form part of the ship’s safety management system and is subject to audit and verification.Each SEEMP is ship-specific and provides a practical approach for ship owners and operators to manage operations and improve efficiency performance over time. For companies with multiple ships, a comprehensive energy management policy for the company’s fleet can act as a base to form individual SEEMPs for each ship.Platforms, including floating production storage and offloading units (FPSOs) and floating storage units (FSUs), and drilling rigs are not required to have a SEEMP. 

SEEMP Part I – ship management plan to improve energy efficiency

SEEMP Part II – fuel oil consumption data

SEEMP Part III – ship operational carbon intensity plan (in development)

5. EEXI Technical File

The International Maritime Organisation (IMO) introduced new regulatory standards for ship energy efficiency – the Energy Efficiency Existing Ship Index (EEXI) and Carbon Intensity Indicator (CII) – which are to take effect in January 2023. Despite the imminence of the implementation of the measures, vessel owners have the opportunity to quickly prepare their assets for compliance by following the below necessary actions:

Step 1 – Calculation of Attained and Required EEXI, as well as EPL power (if necessary)

Step 2 – Development of EEXI Technical File and Onboard Management Manual(OMM)

Step 3 – EEXI TF and OMM submission to class for approval

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