8 Engine changeover/on-off recording requirements
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Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC.1/Circular.795 Rev.6 – Unified Interpretations to MARPOL Annex VI – (10 June 2022) - Annex – Unified Interpretations to MARPOL Annex VI - 8 Engine changeover/on-off recording requirements

8 Engine changeover/on-off recording requirements

Regulation 13

Nitrogen oxides (NOX)

Regulation 13.5.3 reads as follows:

  • "The tier and on/off status of marine diesel engines installed on board a ship to which paragraph 5.1 of this regulation applies which are certified to both Tier II and Tier III or which are certified to Tier II only shall be recorded in such logbook as prescribed by the Administration at entry into and exit from an emission control area designated under paragraph 6 of this regulation, or when the on/off status changes within such an area, together with the date, time and position of the ship."

Interpretation:

8.1 For the application of this regulation:

  • .1 "marine diesel engines installed on board a ship to which paragraph 5.1 of this regulation applies" includes additional or replaced engines;footnote installed on or after the relevant emission control area takes effect;

  • .2 "certified to Tier II only" means a Tier II engine that is installed on board a ship which is constructed on or after the emission control area where the ship is operating takes effect;

  • .3 Tier II engines stipulated under the Tier II requirement of regulation 13.4, i.e. Tier II engines installed on board a ship constructed before the entry into force of the emission control area where the ship is operating, are not considered to be a "Tier II only" engine in the context of record keeping. Such exclusion is extended to Tier II engines replaced after the entry into force of the relevant emission control areas on board ships of this category, if the replacement engines meet resolution MEPC.230(65);

  • .4 if an engine installed on a ship constructed before the entry into force of the emission control area where the ship is operating has undergone a major conversion as described in regulation 13.2.1, those engines are to be Tier III engines; thus the above interpretation in .1 above applies; and

  • .5 recording is required for the Tier II engine operation in a NECA under the exemption according to regulation 13.5.4.

Parent topic: Annex – Unified Interpretations to MARPOL Annex VI
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