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The CC722 is the largest Dynapac asphalt roller, offering great compaction performance. It is also the first Dynapac roller to have the Tier4i / Stage IIIB engine, using Cummins as the engine supplier. The CC722 is equipped with the Cummins QSB 6.7 engine with 164 kW/ 220 hp. For this power rating the Tier 4i/ stage IIIB was valid from 1:st of January 2011 within EU and North-America.
Using diesel particle filter technique
The Cummins engine in the CC722 uses the Diesel Particle Filter Technique (DPF) to get the Particulate Matter (PM) down from 0,2 to 0,025 g/kWh which is a substantial decrease in percent (88%). The Tier 4i/ Stage IIIB will also have substantial lower values for nitrogen oxides and hydrocarbons.
Emission legislations
What's emission legislations all about? And what does it mean? Below, we try to give you some answers.
 What are Stage IIIB and Tier 4 all about?
“Stage IIIB” is EU legislation and “Tier 4 Interim” is US legislation, that together require diesel engines to reduce the effects on the environment of exhaust emissions. All engines greater than 130 kW manufactured on and after 1 January 2011 will have to comply by law. They require the reduction of particulate matter (PM) and nitrogen oxides (NOx). They also regulate emission levels of hydrocarbons (HC) and carbon monoxide (CO). For smooth transition into these stages it is permissable to place a limited number of previous Stage/Tier compliant engines on the market.
How much is the emission reduced?
PM has to be reduced around 90% and HC+NOx 50% compared to the limit from the previous stage.
What about emission legislation in other regions in the world?
Japan is closely following the EU/US. China, India and Korea have limits equal to earlier EU/US stages. Countries like Brazil, Chile and Australia have legislation in the pipeline. EU candidate and potential candidate countries will sooner or later adopt the EU legislation. The EU emission regulation is also valid in the EEA countries of Norway, Iceland and Liechtenstein as well as in Switzerland.
Are there any special requirements for these new engines?
Yes, it is very important that you use ultra low sulphur fuel (< 15 ppm S). This fuel is fully available in the EU/US but could be hard to find in other areas of the world. Fuel with higher sulphur content will damage your engine.
For further details please contact:
Lotta Bynke, Dynapac AB
 lotta.bynke@se.atlascopco.com
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Dynapac is part of the Atlas Copco Group within the Atlas Copco Road Construction Equipment division. We are experts on asphalt, soil and concrete applications, committed to customer performance worldwide. Products and solutions are marketed under the Dynapac brand and complementary brands. Headquartered in Stockholm, Sweden, the division has production facilities in Europe, USA, South America and Asia. |
