Application of "Approved Method" to existing diesel engines under the provisions of Revised MARPOL ANNEX VI - Certification of an Approved Method for WARTSILA RTA engines

As already advised by ClassNK Technical Information No.TEC-0771 dated 13 May 2009, marine diesel engines with a power output of more than 5,000 kW and a per cylinder displacement at or above 90 litres installed on ships constructed on or after 1 January 1990 but prior to 1 January 2000 are to comply with Tier I emission limits using an Approved Method, provided that an Approved Method for that engine has been certified by an Administration (Reg. 13.7.1 of ANNEX VI). On 4 February 2011, the Administration of Germany notified the IMO that they had certified an Approved Method for the WARTSILA RTA engines listed in the table below.

As a result, on 17 February 2011, the IMO published the related information in MEPC.1/Circ.743 as shown in Attachment 1. (This is the second case in which an Approved Method was certified by an Administration. The first case was the Approved Method for the MAN B&W S70MC engine whose relevant information was described in ClassNK Technical Information No.TEC-0836). The Approved Method for the WARTSILA RTA engines is applicable to the individual diesel engines only as listed in the MEPC Circular.