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The Truth About Diesel Exhaust Fluid

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THE TRUTH ABOUT DIESEL EXHAUST FLUID (DEF)

<!-- End Blog Entry Title --><!-- Begin Blog Sub Head --><ACRONYM class=BlogPublished title="9/1/2010 9:14 AM">Sep 1 </ACRONYM>
Written by: Freightliner Custom Chassis Corporation
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By Tony Sippel, RV product manager at Freightliner Custom Chassis Corporation<?XML:NAMESPACE PREFIX = O /><O:p></O:p>
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As vehicles meeting 2010 EPA emissions requirements are hitting the market, Freightliner Custom Chassis Corporation (FCCC) has begun to receive feedback from our motorhome dealerships and potential customers. We've noticed that people are often confused about what exactly diesel exhaust fluid (DEF) is, how it works and how it fits into the Selective Catalytic Reduction (SCR) technology. <O:p></O:p>
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DEF is a solution stored in a tank, which is injected into the exhaust stream, reacting with the Nitrous Oxide (NOx) in the SCR catalyst, forming harmless nitrogen and water. Let's take a moment, though to further dispel the myths and fully answer questions regarding DEF. <O:p></O:p>
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MYTH: SCR technology does not meet EPA 2010 emissions regulations. <O:p></O:p>

FACT: The EPA has approved SCR technology for 2010 emissions regulations. SCR technology is a long-term solution, working to reduce fuel consumption directly tied to carbon-dioxide emissions and significantly decreasing the amount of noxious gasses in the exhaust. <O:p></O:p>
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MYTH: DEF is corrosive, hazardous and unsafe to handle. <O:p></O:p>

FACT: DEF is two-thirds water. It is an organic, nontoxic compound made of 32. 5 percent urea and 67. 5 percent de-ionized water. DEF is carefully regulated by the American Petroleum Institute. Also, urea solution is not flammable and is not deemed “hazardous” by any <?XML:NAMESPACE PREFIX = ST1 /><ST1:pLACE w:st="on"><ST1:COUNTRY-REGION w:st="on">United States</ST1:COUNTRY-REGION></ST1:pLACE> or Canadian transportation authority. <O:p></O:p>
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MYTH: Urea becomes toxic at 118 degrees Fahrenheit. <O:p></O:p>

FACT: According to James Spooner, vice president and general manager at Colonial Chemical Company, urea does not become toxic at any temperature. At 122 degrees Fahrenheit, DEF will still meet ISO specifications of less than 0. 2 percent ammonia for at least 35 days. At that rate, it would take more than two years to reach the ammonia level of household ammonia, which obviously is not classified as toxic. <O:p></O:p>
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MYTH: DEF solution is a significant added expense for vehicle owners. <O:p></O:p>

FACT: The industry is expecting the cost of DEF solution to be parallel with the price of fuel, fluctuating between $2. 50 and $3. 50 per gallon. Just 2. 5 gallons of DEF will yield more than 800 miles of travel. FCCC uses 10 and 13 gallon tanks. Drivers should expect to refill their DEF tank three times a year. Also, through extensive testing, Cummins Engine realized a 5 percent to 9 percent fuel economy advantage with SCR over the alternative in-cylinder EGR solution, which amounts to significant savings over time. <O:p></O:p>
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MYTH: Refilling the DEF tank is a hassle for vehicle owners. <O:p></O:p>

FACT: The DEF tank is as easily accessible to drivers as the gasoline tank. Think of it this way: Refilling your DEF tank is like refilling your windshield wiper fluid. It's something that is completed a few times a year, taking no more than five or 10 minutes. <O:p></O:p>
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With so many myths out there, it's easy to see why motorhome dealers and drivers have questions about DEF and SCR technology. We hope this has helped clear up any confusion on the topic you may have experienced. If you do have questions or would like more information about DEF and SCR technology, please visit Facts About SCR or post your questions here, and I'll be sure to follow up with you. <O:p></O:p>
 
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So if it is 2/3rds water, I guess it still will not freeze? What happens if the tank runs out, can you still drive? What happens if you don't use it?



Nick
 
I guess it depends on the computer programming of the particular truck and engine but I think I've read the ECM will put the engine in the limp home mode, perhaps even refuse to start if the driver tries to continue. Big brother is watching.
 
Good info Harvey. One of the local ford mechanics has been to the school for the new ford diesel and at the school they said that the ford would go into idle only mode. Couldn't shut the motor completely off in case you were in a freezing situation.
 
DEF freezes at +12 degrees F. This is good info, but I believe some of the consumption figures apply to OTR tractors, not pickups. Hopefully, Cummins and Ram will realize its FE benefits and use this system on future trucks.
 
We here in Coldville are a little concerned with the freezing aspect of the DEF. We have been told that a Class 8 truck will allow approximately 70 miles of operation with no DEF flow (ie-tank frozen solid) to allow it to thaw with the aid of the in-tank heater. After 70 miles with no DEF flow they will derate, to what point I am not sure.
 
my dad was talking to a neighbor last week that was at a local tractor dealer for an open house type of thing. anyway he was told that a couple of the big tractor companies will be going to using def on there engines as well. if you run out of fluid the implement goes into limp mode till it is refilled. talk around the dealer was the price of older stuff was gonna go up because guys weren't gonna wanna deal with it. which i can understand. i dont think it is something i would wanna have to worry about when i was busy in the field.

didnt know if anyone else in the ag. industry had heard anything bout this.
 
I would think it would only be required for on highway use, AG and construction would be exempt?



If it is simular to say... ... a water meth system, as in the fluid is burned by combustion, might it not be a good thing?



Nick
 
I would think it would only be required for on highway use, AG and construction would be exempt?



If it is simular to say... ... a water meth system, as in the fluid is burned by combustion, might it not be a good thing?



Nick



well the only reason i figured it was a similar to trucks was the implement going in to limp mode. however as you said they could be burning def in a completly different way than they do on trucks. dont know this is just what they heard at a dealer. i sure would think that the regulations on ag and construction would not be as strick as on highway.
 
I think the current politicians in DC will soon attack all engines with their ridiculous and heavy handed regulations. I would expect agricultural, road construction, marine, probably aviation also will be overregulated soon if they can get away with it.
 
I won't go into a discussion of the underlying politics since this is not the political forum but I am hearing reports each day in the news that tell me a major change in political philosophy and focus is going to occur in just two months. Some of the threats and heavy handed regulation currently planned and being implemented will soon be thrown in the trash heap.
 
I think the current politicians in DC will soon attack all engines with their ridiculous and heavy handed regulations. I would expect agricultural, road construction, marine, probably aviation also will be overregulated soon if they can get away with it.



i agree only a matter of time before the epa comes after off highway motors as well. but lets be honest these are "highly educated" politicians, they know best.
 
I can only imagine how entertaining it will be when the EPA decides it is going to "inspect" some farmer's SCR equipped AG tractor or some construction site equipment for compliance. Maybe the government can go add some emissions control devices on a few volcanoes too.
 
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Freebore, you raise a good point about the volcanoes. IMO, NOX aftertreatment is a long way off on construction and AG equipment. In the not-too-distant future, there will be some restrictions on PM that will require the use of a DPF, but that should be relatively easy, as most of the problems were solved with on road engines. The one thing I fear is a wholesale switch to NG with its questionable benefits, and you, I and Harvey paying for the required infrastructure.
 
Exhaust aftertreatment in off-highway, agriculture, and stationary diesel is already underway. Testing began approx. 18 months ago, and I am currently involved in information gathering/testing. From what I gather, the initial implementation of emissions regulations will begin in 2012. Several "end users" of said equipment have been purchasing extra inventory of 2010 and 2011 model engines so that they will be able to skip the first build year of off-highway regen.

Coming? No, its already here!
 
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