IMO says ship engines should comply with NOx code from 1 January 2000


 

IMO says ship engines should comply with NOx code from 1 January 2000

 

Engines installed on ships constructed on or after 1 January 2000 or engines which undergo a major conversion on or after 1 January 2000 should meet the requirements of the Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines (NOx Technical Code.

The NOx Technical Code was adopted at a conference held in September 1997 under the auspices of the International Maritime Organization (IMO), the United Nations agency concerned with the safety of shipping and the prevention of marine pollution.

The Code was adopted at the same time as a new Annex VI on the Prevention of Air Pollution from Ships was added to the International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 (MARPOL 73/78)

Annex VI, when it comes into force, will set limits on sulphur oxide and nitrogen oxide emissions from ship exhausts and prohibit deliberate emissions of ozone depleting substances.

Regulation 13 of Annex VI sets limits for emission values of NOx and the aim of the NOx Code is to establish mandatory procedures for the testing, survey and certification of marine diesel engines, in order to enable engine manufacturers, shipowners and Administrations to ensure that all applicable marine diesel engines comply with the regulation.

Although the Regulation will not enter into force until Annex VI of MARPOL 73/78 enters into force, Administrations are encouraged to issue interim certificates confirming conformity with the NOx Technical Code for engines installed on ships on or after 1 January 2000, or for engines undergoing a major conversion on or after 1 January 2000. The aim is to ensure that new or modified engines will already be compliant with the NOx Code once it enters into force.

IMO issued an MEPC Circular in November 1998 on Interim Guidelines for the application of the NOx technical Code which recommends that "Each engine which will become, retrospectively, subject to the provisions of regulation 13 of Annex VI of MARPOL 73/78 upon its entry into force, should be certified in accordance with the requirements of the NOx Technical Code."

Annex VI of MARPOL 73/78 will enter into force twelve months after the date on which not less than fifteen States, the combined tonnage of which shall be not less than 50% of the gross tonnage of the world's merchant shipping fleet, have become parties to the Protocol to MARPOL which contains the Annex VI.

To date, two countries have become Parties to Annex VI: Norway and Sweden.

 

Background:

MEPC/Circ.344 issued 19 November 1998

 

INTERIM GUIDELINES FOR THE APPLICATION OF THE NOx TECHNICAL CODE

  1. The Conference of Parties to the International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 relating thereto, held from 15 to 26 September 1997 in conjunction with the Marine Environment Protection Committee's fortieth session, adopted, in Conference Resolution 2, the Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines (The NOx Technical Code).

  2. The purpose of the NOx Technical Code is to establish mandatory procedures for the testing, survey and certification of marine diesel engines which will enable engine manufacturers, shipowners and Administrations to ensure that all applicable marine diesel engines comply with the relevant limits for emission values of NOx as specified in regulation 13 of Annex VI to MARPOL 73/78.

  3. It is noted that regulation 13 of MARPOL Annex VI is intended to be applied to diesel engines installed on ships constructed on or after 1 January 2000. While the requirements of the regulation could not be enforced before the entry into force of the Protocol of 1997, it should be clearly understood that engines installed on ships constructed on or after 1 January 2000 or engines which undergo a major conversion on or after 1 January 2000 will have to meet these requirements once the Protocol enters into force.

  4. To allow uniform application of the Code, and to assist Administrations in certifying engines in accordance with it, prior to the date of entry into force of Annex VI, the guidelines attached at annex to this Circular are recommended to be used.

ANNEX

INTERIM GUIDELINES FOR THE APPLICATION OF THE NOx TECHNICAL CODE

 

  1. Each engine which will become, retrospectively, subject to the provisions of regulation 13 of Annex VI of MARPOL 73/78 upon its entry into force, should be certified in accordance with the requirements of the NOx Technical Code.

  2. Pending entry into force of Annex VI and upon satisfactory compliance with the Code requirements, a "Statement of Compliance" with the NOx Technical Code should be issued by the flag State Administration, or an organization acting on behalf of that Administration. Such a Statement of Compliance should contain as a minimum the information as required by appendix 1 of the NOx Technical Code.

  3. The Statement of Compliance is intended as an interim measure pending issuance of the Engine International Air Pollution Prevention (EIAPP) and/or International Air Pollution Prevention (IAPP) Certificate upon entry into force of Annex VI.

  4. Administrations are urged to take into consideration the Statement of Compliance when issuing certificates in accordance with Annex VI, whether or not the Statement of Compliance was issued by their Administration, or organizations acting on their behalf, or by other Governments.


Regulation 13 of Annex VI of MARPOL 73/78

 

REGULATION 13

Nitrogen Oxides (NOx)

 

    1. This regulation shall apply to:

      1. each diesel engine with a power output of more than 130 kW which is installed on a ship constructed on or after 1 January 2000; and

      2. each diesel engine with a power output of more than 130 kW which undergoes a major conversion on or after 1 January 2000.

    2. This regulation does not apply to:

      1. emergency diesel engines, engines installed in lifeboats and any device or equipment intended to be used solely in case of emergency; and

      2. engines installed on ships solely engaged in voyages within waters subject to the sovereignty or jurisdiction of the State the flag of which the ship is entitled to fly, provided that such engines are subject to an alternative NOx control measure established by the Administration.

    3. Notwithstanding the provisions of sub-paragraph (a) of this paragraph, the Administration may allow exclusion from the application of this regulation to any diesel engine which is installed on a ship constructed, or on a ship which undergoes a major conversion, before the date of entry into force of the present Protocol, provided that the ship is solely engaged in voyages to ports or offshore terminals within the State the flag of which the ship is entitled to fly.

    1. For the purpose of this regulation, "major conversion" means a modification of an engine where:

      1. the engine is replaced by a new engine built on or after 1 January 2000, or
      2. any substantial modification, as defined in the NOx Technical Code, is made to the engine, or
      3. the maximum continuous rating of the engine is increased by more than 10%.

    2. The NOx emission resulting from modifications referred to in the sub-paragraph (a) of this paragraph shall be documented in accordance with the NOx Technical Code for approval by the Administration.

    1. Subject to the provision of regulation 3 of this Annex, the operation of each diesel engine to which this regulation applies is prohibited, except when the emission of nitrogen oxides (calculated as the total weighted emission of NO2) from the engine is within the following limits:

      1. 17.0g/kWh when n is less than 130 rpm
      2. 45.0*n(-0.2) g/kWh when n is 130 or more but less than 2000 rpm
      3. 9.8 g/kWh when n is 2000 rpm or more

        where n = rated engine speed (crankshaft revolutions per minute).

       

      When using fuel composed of blends from hydrocarbons derived from petroleum refining, test procedure and measurement methods shall be in accordance with the NOx Technical Code, taking into consideration the Test Cycles and Weighting Factors outlined in appendix II to this Annex.

    2. Notwithstanding the provisions of sub-paragraph (a) of this paragraph, the operation of a diesel engine is permitted when:

      1. an exhaust gas cleaning system, approved by the Administration in accordance with the NOx Technical Code, is applied to the engine to reduce onboard NOx emissions at least to the limits specified in sub-paragraph (a), or

      2. any other equivalent method, approved by the Administration taking into account relevant guidelines to be developed by the Organization, is applied to reduce onboard NOx emissions at least to the limit specified in sub-paragraph (a) of this paragraph.