4 Gas sampling and transfer system
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - International Codes - NOx Technical Code (2008) - Technical Code on Control of Emission of Nitrogen Oxides from Marine Diesel Engines - Appendix 8 – Implementation of the direct measurement and monitoring method(Refer to 6.4 of the NOx Technical Code 2008) - 4 Gas sampling and transfer system

4 Gas sampling and transfer system

  4.1 The exhaust gas sample shall be representative of the average exhaust emission from all the engine’s cylinders. The gas sampling system shall comply with 5.9.3 of this Code.

  4.2 The exhaust gas sample shall be drawn from a zone within 10% to 90% of the duct diameter.

  4.3 In order to facilitate the installation of the sampling probe, an example of a sample point connection flange is given in section 5.

  4.4 The exhaust gas sample for NOx measurement shall be maintained so as to prevent NO2 loss via water or acid condensation in accordance with analysing equipment manufacturers’ recommendations.

  4.5 The gas sample shall not be dried by chemical driers.

  4.6 The gas sampling system shall be capable of being verified to be free of ingress leakage in accordance with analysing equipment manufacturers’ recommendations.

  4.7 An additional sample point adjacent to that used shall be provided to facilitate quality control checks on the system.

Parent topic: Appendix 8 – Implementation of the direct measurement and monitoring method (Refer to 6.4 of the NOx Technical Code 2008)
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