5.5 Determination of exhaust gas flow
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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 - Chapter 5 - Procedures for NOx emission measurements on a test bed - 5.5 Determination of exhaust gas flow

5.5 Determination of exhaust gas flow

  5.5.1 The exhaust gas flow shall be determined by one of the methods specified in 5.5.2, 5.5.3 or 5.5.4.

 5.5.2 Direct measurement method

  5.5.2.1 This method involves the direct measurement of the exhaust flow by flow nozzle or equivalent metering system and shall be in accordance with a recognized international standard.

  Note: Direct gaseous flow measurement is a difficult task. Precautions shall be taken to avoid measurement errors which result in emission value errors.

 5.5.3 Air and fuel measurement method

  5.5.3.1 The method for determining exhaust emission flow using the air and fuel measurement method shall be conducted in accordance with a recognized international standard.

  5.5.3.2 This involves measurement of the air flow and the fuel flow. Air flow-meters and fuel flow-meters with an accuracy defined in 1.3.1 of appendix 4 of this Code shall be used.

  5.5.3.3 The exhaust gas flow shall be calculated as follows:

  5.5.3.4 The air flow-meter shall meet the accuracy specifications of appendix 4 of this Code, the CO2 analyser used shall meet the specifications of appendix 3 of this Code, and the total system shall meet the accuracy specifications for the exhaust gas flow as given in appendix 4 of this Code.

 5.5.4 Fuel flow and carbon balance method

  5.5.4.1 This involves exhaust mass flow rate calculation from fuel consumption, fuel composition and exhaust gas concentrations using the carbon balance method, as specified in appendix 6 of this Code.

Parent topic: Chapter 5 - Procedures for NOx emission measurements on a test bed
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