Page 93: of Maritime Reporter Magazine (September 1999)

Marine Diesel Engines: Entering A New Certification Era 0Continued from page 74) )le matter of verification rather than urning the ship into a seagoing emis- ;ions measurement laboratory.

Vew Engines

All engine builders who supply engines that will fall within the scope of the Annex VI requirements for installa- tion on ships built on or after January 1, 2000 will therefore generally be expect- ed to supply engines that are either pre- certified or, in those few cases where engines cannot be accommodated on test beds, tested to the required extent onboard following installation. When the Annex enters into force, pre-certifi- cation will result in the issue of an

Engine International Air Pollution Pre- vention (EIAPP) Certificate; however, in the interim period it will be a State- ment of Compliance with the NOx

Technical Code which will be issued instead.

The actual engine certification process depends on the principles that NOx emissions do not increase over the ser- vice life of an engine and that, under standardized conditions, do not differ between engines of the same design, adjustment and usage. Consequently, the basis of the whole NOx certification program is to measure once but rigor- ously, as per the NOx Technical Code, for the Parent Engine and thereafter to ensure by means of the conformity of production that all subsequent engines, to be covered by that test, will have

NOx emission rates no higher than that of the Parent Engine.

The approval process for a Parent

Engine divides into a number of stages: • Categorization into either Engine

Family or Engine Group depending on the potential range of adjustment and the possibility of modifications • Selection of the Parent Engine - The

Parent Engine is to have the highest

NOx emission rate of all those engines within the Engine Family or Engine

Group which are to be represented by that Parent Engine. • Adjustment and fit of the Parent

Engine as tested. Again these are to such as to give the highest NOx emission rate for the selected Parent Engine. • Parent Engine test in accordance with the NOx Technical Code. • Preparation of the Technical File - this is to give the engine's rated perfor- mance, any designation and restrictions and identify the components, settings, operating values and adjustment ranges of those items which can affect the NOx emissions. The specification of spare parts is also to be included. In the case of Engine Group members, the Onboard

NOx Verification procedures must also be given.

Since these aspects tend to be very specific to the engines under considera- tion, it is for the engine builders to pre- pare their proposals in respect of each of these five stages and to submit these for approval to the relevant administration or delegated organization. In order to support the proposed Parent Engine selection, adjustment and fit, it may be necessary for the engine builder to have undertaken a number of emission trials to determine the actual effects of the various factors that influence NOx for- mation during the combustion process with the Parent Engine test therefore being the final verification of perfor- mance. In addition, for series produced engines, the engine manufacturer would need to show that adequate arrange- ments will be in place to ensure effec- tive control of the conformity of pro- duction.

Major Conversions

For those engines within the scope of the Annex VI requirements, a major conversion is defined in the NOx Tech- nical Code as where the engine is replaced by a new engine built on or after January 1, 2000, where the maxi- mum continuous rating of an engine is increased by more than 10 percent or where it is subject to a 'substantial mod- scription information

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