Statutory Documents - IMO Publications and Documents - Resolutions - Marine Environment Protection Committee - Resolution MEPC.198(62) – 2011 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 – (Adopted on 15 July 2011) - Annex – 2011 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 - 7 On Board Confirmation Test for Scheme B
7 On Board Confirmation Test for Scheme B
7.1 After installation on board of an engine system fitted with SCR and before entry into service an initial confirmation test should be performed on board.
7.2 The engine system fitted with the SCR should be verified as corresponding to the description given in the Technical File.
7.3 The confirmation test should be undertaken as close as possible to 25%, 50% and 75% of rated power, independent of test cycle.
7.4 At each mode point of the confirmation test the operating values as given in the Technical File should be verified.
7.5 NOx emission concentrations should be measured at the inlet and outlet of the SCR chamber. The NOx reduction rate should be calculated. Both values should either be dry or wet. The value obtained for NOx reduction rate should be compared to the initial confirmation test required value at each mode point as given in the Technical File. Reduction efficiency values obtained at each of the test points should not be less than the corresponding values as given in the Technical File by more than 5%.
7.6 The NOx analyser should meet the requirements of chapter 5 of the NTC 2008.
7.7 When an engine system fitted with SCR is in a group defined in chapter 4 of these guidelines, the confirmation test should be conducted only for the parent engine system of the group.
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