The Merchant Shipping (Prevention of Air Pollution from Ships) Regulations 2008

Nitrogen oxides

21.—(1) Subject to paragraph (2), this regulation applies to—

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

(b)every diesel engine with a power output of more than 130 kW which is installed on a ship and which undergoes or has undergone a major conversion on or after 1st January 2000.

(2) This regulation does not apply to any engine referred to in Schedule 2.

(3) Where a diesel engine is installed on a United Kingdom ship engaged solely in voyages to ports or offshore terminals within United Kingdom waters, and—

(a)that ship was constructed; or

(b)the engine underwent a major conversion,

before 19th May 2005, the Secretary of State may on application by the owner of the ship direct that this regulation does not apply to that engine.

(4) Subject to paragraph (7), the operation of a diesel engine is prohibited, except where the emission of nitrogen oxide (calculated as the total weighted emission of NO₂) from the engine is no more than—

(a)17.0 g/kWh when n is less than 130 rpm;

(b)45.0 x n ^-0.2 g/kWh when n is 130 or more but less than 2000 rpm;

(c)9.8 g/kWh when n is 2000 rpm or more,

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

(5) When assessing under paragraph (4) the emission of nitrogen oxide from a diesel engine using fuel composed of blends of hydrocarbons derived from petroleum refining, the test procedure and measurement methods must be in accordance with the NO_x Technical Code.

(6) The owner of a ship must ensure that the emission of nitrogen oxide from a diesel engine that is installed on that ship and that has undergone a major conversion is recorded in accordance with the NO_x Technical Code and approved by the Certifying Authority.

(7) Notwithstanding paragraph (4), the operation of a diesel engine is permitted when either an exhaust gas cleaning system or any other equivalent method, approved in accordance with Merchant Shipping Notice 1734 (M+F) or Merchant Shipping Notice 1735 (M+F) as appropriate, is applied to the engine to meet the emission standards in paragraph (4).

(8) In this regulation “major conversion” means a modification of an engine where—

(a)the engine is replaced by a new engine built on or after 1st January 2000; or

(b)any substantial modification, as defined in the NO_x Technical Code, is made to the engine; or

(c)the maximum continuous rating of the engine is increased by more than 10 per cent.