Commercial and Fleet Fuel Dispensers - Atlas DEF Dispenser
Atlas® DEF Dispenser - COMING SOON!
What is DEF?
DEF is an acronym for Diesel Exhaust Fluid. On diesel vehicles outfitted with Selective Catalytic Reduction (SCR) technology, DEF will be an integral fluid required for vehicle operation. It will be installed on 85% of all large trucks manufactured, beginning in January 2010.
Is DEF the same thing as urea? Does it freeze and at what temperature?
DEF contains 32.5% Urea and 67.5% water. The freeze point of DEF is 12 degrees F.
What are the benefits of DEF or SCR technology on diesel engines?
SCR technology has been the only proven technology that meets the stringent Environmental Protection Agency (EPA) guidelines for reduced emissions of Nitrogen Oxides (NOx). Other technologies such as Cooled Engine Gas Recirculation (EGR) have not proven to meet the guidelines. The secondary benefit is improved mileage efficiency by 3-5% over standard engines.
How does SCR use DEF to reduce emissions?
To reduce NOx, a small amount of DEF is injected directly into the exhaust upstream of a catalyst. The DEF vaporizes and decomposes to form ammonia, which in conjunction with the SCR catalyst, reacts with NOx to convert the pollutant into nitrogen and water. This means that trucks will have to carry a sufficient quantity of DEF on board. Depending on the capacity of the DEF tank, the SCR system is expected to add 300 – 400 pounds to the weight of a Class 8 truck.
What installation materials (piping / hoses / containment information) are compatible with DEF?
For a full explanation of DEF and how it works to protect you and the environment, see our accompanying whitepaper, SP-3335.
When is DEF going to be required? Who will be affected?
SCR systems will be installed on 85% of new diesel vehicles beginning January 1, 2010. All new engines purchased after January 1, 2010 will need to meet the EPA standard for NOx emissions. Those engines manufactured before December 31, 2009 are not subject to the regulation.
Why not 100% of large trucks?
There are two different ways to meet the 2010 environmental regulation. SCR, which utilizes DEF, and EGR are the two approaches. 85% of the truck manufacturer’s have chosen (SCR) as their way of complying with the new regulation. A more detailed explanation of the two systems can found in the whitepaper SP-3335A.
What is the size of the DEF tank and what is the burn rate to diesel fuel?
The DEF tank on diesel engines will be sized between 10 and 25 gallons. The burn rate or consumption of DEF in a diesel engine will be between 3% - 5% of the diesel fuel.
