7 The quantity of pollution in exhaust gases
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Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC/Circular.729 – Design Guidelines and Operational Recommendations for Ventilation Systems in Ro-Ro Cargo Spaces – (Adopted on 4 July 1996) - Part 1 - Design Guidelines and Operational Recommendations for Ventilation Systems in Ro-Ro Cargo Spaces - Appendix 1 - Ventilation of ro-ro cargo spaces - Requirements and basic calculations - 7 The quantity of pollution in exhaust gases

7 The quantity of pollution in exhaust gases

 The quantity shown below of carbon monoxide (CO), nitric oxide (NOx), hydrocarbons (HC) and nitrogen dioxide (NO2) in exhaust gases generated by petrol and diesel engines, applies to engines without exhaust gas purifier. Stated values are average values and are to be considered representative of a large group of vehicles.

Parent topic: Appendix 1 - Ventilation of ro-ro cargo spaces - Requirements and basic calculations

7.1 Petrol engines, cylinder volume 1000 - 2000 cm3

 Example of vehicle: Passenger cars

  Pollution in mg/sfootnote
Operating cycles CO NOx HC
Idling (600 - 1000 r/min) 100 - 150 1 - 2 10 - 15
Constant speed, 15 km/h 200 - 250 3,3 - 3,5 15 - 20
Constant speed, 30 km/h 250 - 300 7 - 8,5 15 - 20
Acceleration, 0,6 m/s2, (0 - 15 km/h) 250 - 300 5 - 6,5 15 - 20
Motor breaking 0,6 m/s2, (15-0 km/h) 110 - 140 1 28 -33

7.2 Diesel engines

  7.2.1 Turbo-charged diesel engine, approximately 150 kW

Examples of vehicles: Larger lorries, loaders and larger trucks.

  Pollution in mg/sfootnote
Operating cycles CO NOx HC NO2
Idling 20 - 30 17 - 25 15 - 25 5 - 8
Lift 2500 r/min 170 10 - 100 100 5 - 50
Transport 2260 r/min 150 600 - 700 130 25 - 30

  7.2.2 Suction fed diesel engine, with air storage chamber, approximately 150 kW

  Pollution in mg/sfootnote
Operating cycles CO NOx HC NO2
Idling 20 - 25 25 - 30 2 - 4 8 - 9
Lift 2150 r/min 50 - 60 10 - 130 10 - 15 5 - 65
Transport 2000 r/min 130 - 150 100 - 225 15 - 35 4 - 9

  7.2.3 Suction fed diesel engine without air storage chamber, approximately 130 kW

Examples of vehicles: Lorries, loaders and buses

  Pollution in mg/sfootnote
Operating cycles CO NOx HC NO2
Idling 20 - 25 15 - 20 10 - 15 5 - 6
Lift 2200 r/min 50 - 60 22 - 26 40 - 60 10 - 15
Transport 2200 r/min 170 - 200 136 - 150 10 - 15 5 - 6

  7.2.4 Suction fed diesel engine without air storage chamber, approximately 74 kW

Examples of vehicles: Fork lift trucks and passenger cars

  Pollution in mg/sfootnote
Operating cycles CO NOx HC NO2
Idling 3 - 5 2 -5 1 0,5 - 1,5
Lift 3000 r/min 50 - 60 5 -10 30 - 40 2,5 - 5
Transport 3000 r/min 60 - 70 40 - 50 10 - 20 1,5 - 2,5
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