Chapter 5.9 - Test Run
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Marine Environment Protection Committee - MEPC/Circular.473 – Approved Unified Interpretations to MARPOL Annex VI and the NOx Technical Code – (29 July 2005) - Annex - Unified Interpretations to MARPOL Annex VI And the NOx Technical Code - Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines (NOx Technical Code) - Chapter 5.9 - Test Run

Chapter 5.9 - Test Run

Parent topic: Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines (NOx Technical Code)

Chapter 5.9.2 - Main exhaust components to be analysed

Chapter 5.9.2.1 reads as follows:

 An analytical system for the determination of the gaseous emissions (CO, CO2, HC, NOx, O2) in the raw exhaust gas shall be based on the use of the following analysers:

  • .1 HFID analyser for the measurement of hydrocarbons;

  • .2 NDIR analyser for the measurement of carbon monoxide and carbon dioxide;

  • .3 HCLD or equivalent analyser for the measurement of nitrogen oxides; and

  • .4 PMD, ECS or ZRDO for the measurement of oxygen.

Interpretation:

 For application of 5.9.2.1.3 the term "equivalent" in this instance should be interpreted as referring to the use of CLD analysers for the dry basis measurement of nitrogen oxides.

Chapter 5.9.7 Analyser response

Chapter 5.9.7 reads as follows:

 The output of the analysers shall be recorded, both during the test and during all response checks (zero and span), on a strip chart recorder or measured with an equivalent data acquisition system with the exhaust gas flowing through the analysers at least during the last ten minutes of each mode.

Interpretation:

 For application of this section it should be interpreted that the response must be of sufficient accuracy and resolution to enable verification of the zero and span response of the analysers in accordance with 5.9.9.

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