SCR system and relevant certification procedure for marine application is defined by IMO.
According to resolution MEPC.198(62), SCR system is considered as an engine component.
Therefore, instead of separate certification of SCR system, IMO NOx verification in combination
with engine is required according to Scheme A and Scheme B.
NoNOx SCR system can be verified and receive IMO NOx Tier III certification at HHI-EMD testbed
according to Scheme A.