Annex - Amendments to the 2014 Guidelines on Survey and Certification of the Energy Efficiency Design Index (EEDI) (Resolution MEPC.254(67))
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Statutory Documents - IMO Publications and Documents - Resolutions - Marine Environment Protection Committee - Resolution MEPC.261(68) - Amendments to the 2014 Guidelines on Survey and Certification of the Energy Efficiency Design Index (EEDI) (Resolution MEPC.254(67)) – (Adopted on 15 May 2015) - Annex - Amendments to the 2014 Guidelines on Survey and Certification of the Energy Efficiency Design Index (EEDI) (Resolution MEPC.254(67))

Annex - Amendments to the 2014 Guidelines on Survey and Certification of the Energy Efficiency Design Index (EEDI) (Resolution MEPC.254(67))

 This document has been consolidated into resolution MEPC.254(67)

1 Paragraphs 4.3.5 and 4.3.6 are replaced with the following:

  • "4.3.5 Sea conditions should be measured in accordance with ITTC Recommended Procedure 7.5-04-01-01.1 Speed and Power Trials Part 1; 2014 or ISO 15016:2015.”

  • 4.3.6 Ship speed should be measured in accordance with ITTC Recommended Procedure 7.5-04-01-01.1 Speed and Power Trials Part 1; 2014 or ISO 15016:2015, and at more than two points of which range includes the power of the main engine as specified in paragraph 2.5 of the EEDI Calculation Guidelines."

 2 Paragraphs 4.3.8 and 4.3.9 are replaced with the following:

  • "4.3.8 The submitter should develop power curves based on the measured ship speed and the measured output of the main engine at sea trial. For the development of the power curves, the submitter should calibrate the measured ship speed, if necessary, by taking into account the effects of wind, current, waves, shallow water, displacement, water temperature and water density in accordance with ITTC Recommended Procedure 7.5-04-01-01.2 Speed and Power Trials Part 2; 2014 or ISO 15016:2015. Upon agreement with the shipowner, the submitter should submit a report on the speed trials including details of the power curve development to the verifier for verification.

  • 4.3.9 The submitter should compare the power curves obtained as a result of the sea trial and the estimated power curves at the design stage. In case differences are observed, the attained EEDI should be recalculated, as necessary, in accordance with the following:

    • .1 for ships for which sea trial is conducted under the condition as specified in paragraph 2.2 of the EEDI Calculation Guidelines: the attained EEDI should be recalculated using the measured ship speed at sea trial at the power of the main engine as specified in paragraph 2.5 of the EEDI Calculation Guidelines; and

    • .2 for ships for which sea trial cannot be conducted under the condition as specified in paragraph 2.2 of the EEDI Calculation Guidelines: if the measured ship speed at the power of the main engine as specified in paragraph 2.5 of the EEDI Calculation Guidelines at the sea trial conditions is different from the expected ship speed on the power curve at the corresponding condition, the shipbuilder should recalculate the attained EEDI by adjusting ship speed under the condition as specified in paragraph 2.2 of the EEDI Calculation Guidelines by an appropriate correction method that is agreed by the verifier.

  • An example of scheme of conversion from trial condition to EEDI condition at EEDI power is given as follows:

  • Vref is obtained from the results of the sea trials at trial condition using the speed-power curves predicted by the tank tests. The tank tests shall be carried out at both draughts: trial condition corresponding to that of the S/P trials and EEDI condition. For trial conditions the power ratio ɑP between model test prediction and sea trial result is calculated for constant ship speed. Ship speed from model test prediction for EEDI condition at EEDI power multiplied with ɑP is Vref.

    • where:
    • PTrial,P : power at trial condition predicted by the tank tests
    • PTrial,S : power at trial condition obtained by the S/P trials
    • ɑP: power ratio

  • Figure 2 shows an example of scheme of the conversion to derive the resulting ship speed at EEDI condition ( Vref ) at EEDI power.

  • Figure 2: An example of scheme of conversion from trial condition to EEDI condition at EEDI power

  • Note: Further consideration would be necessary for speed adjustment methodology in paragraph 4.3.9.2 of these guidelines. One of the concerns relates to a possible situation where the power curve for sea trial condition is estimated in an excessively conservative manner (i.e. power curve is shifted in a leftward direction) with the intention to get an upward adjustment of the ship speed by making the measured ship speed at sea trial easily exceed the lower-estimated speed for sea trial condition at design stage."
Parent topic: Resolution MEPC.261(68) - Amendments to the 2014 Guidelines on Survey and Certification of the Energy Efficiency Design Index (EEDI) (Resolution MEPC.254(67)) – (Adopted on 15 May 2015)
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