Marine diesel engines with SCR: practical experiences of from the perspective of a classification society

Abstract

On its 62nd session the Maritime Environmental Protection Committee (MEPC) of the International Maritime Organisation (IMO) adopted guidelines addressing additional aspects to the NOx Technical Code 2008 with regard to particular requirements related to marine Diesel Engines fitted with Selective Catalytic Reduction (SCR) systems. Following these guidelines a combined engine and SCR can be tested separately in cases where the combined system can neither be tested on a test bed due to their size, construction and other restrictions nor an on board test can be performed fully complying with the requirements of the NOx Technical Code. This certification procedure has been referred to as the “Scheme B approach”.