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 - 5 Test Procedures for Scheme A - 5.2 Calculation of gaseous emissions
5.2 Calculation of gaseous emissions
5.2.1 The calculation method in section 5.12 of the NTC 2008 is also applied to engine systems fitted with SCR. No allowance is made for the reductant solution injected into the exhaust gas stream in respect of its effect on exhaust gas mass flow rate calculation (appendix VI) or dry/wet correction factor (equation (11), paragraph 5.12.3.2.2 of the NTC 2008). The NOx correction factor for humidity and temperature (equations (16) or (17), paragraphs 5.12.4.5 and 5.12.4.6, respectively, of the NTC 2008) should not be applied.
5.2.2 For an engine system fitted with SCR, the following parameters should be measured and recorded in the engine test report in accordance with section 5.10 of the NTC 2008:
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.1 injection rate of reductant at each load point (kg/h);
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.2 exhaust gas temperature at the inlet and outlet of the SCR chamber (°C);
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.3 pressure loss (kPa): it is necessary to measure the pressure at inlet and at outlet of the SCR chamber and to calculate pressure loss Δp. If the manufacturer sets an allowable limit of Δp, it should be confirmed; and
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.4 other parameter(s) as specified by the Administration.
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