DEF Operation Flashcards
The Cummins EPA 2013 ISX12 engine is provided with an Aftertreatment system that provides near ___.
zero emissions
Regeneration is the process of converting soot collected from in the aftertreatment DPF into ___.
carbon dioxide
Passive Regeneration Occurs when the exhaust temperatures are ____ enough to oxidize soot collected in the aftertreatment DPF faster than the soot is being collected.
naturally high
Passive regeneration typically occurs when the vehicle is driven at _____
high speeds (ie, highway speeds) and/or under heavy loads.
Active Regeneration — Required when the duty cycle does not generate enough heat to convert all the ____ being collected in the DPF.
carbon
The exhaust temperature during a normal active regeneration event could reach ____ and possibly ____ under certain conditions.
1100º F / 1500º F
DEF breaks down into ammonia (NH3) during a chemical reaction in the Decomposition Reactor through a process known as ____.
hydrolysis.
The NOx and ammonia (NH3) pass into the SCR element where a catalytic reaction takes place, converting the NOx into _____.
harmless nitrogen gas (N2) and water vapor (H2O
DEF is a solution of ___ automotive grade urea and ___ deionized water.
32.5% / 67.5%
DEF is ___ to handle and store. It is ___, NON-polluting and NON-flammable.
SAFE / NON-toxic
It will freeze at ____.
12 F (-11C).
DEF consumption will be approximately ___ of your fuel consumption.
2%
DEF has a shelf life of approximately ___ if stored in controlled temperatures between____.
two years / 10 and 90 deg F.
If stored outside of these temperatures it will last at least ___.
one year
Every vehicle with a U.S. Environmental Protection Agency (EPA) ___ or later engine has an on-frame storage tank for Diesel Exhaust Fluid (DEF) and a dash lamp that indicates low DEF levels.
2010
During regeneration, exhaust gas temperatures could reach ____, and exhaust system surface temperature could exceed _____.
1500º F / 1300º F
Engine speed will increase and could possibly reach between ____.
1000 to 1500 RPM.
The engine will begin the active regeneration process once the exhaust temperature is hot enough and will continue until the soot in the DPF has been burned off. Expect this process to take between _____.
20 and 40 minutes
If a call comes in before the regeneration process is complete, simply operate the apparatus as you would in any normal call. The regeneration process will be interrupted by tapping the ___or by releasing the ___.
service brake / parking brake
If the DPF lamp is still illuminated when you return from the call, park the apparatus and engage the ____ switch as before. The process will begin again from where it left off.
manual regen
Parked Regen
Be sure there are no items within __ of the exhaust outlet. Items that can burn, melt or explode must be kept at least __. from the exhaust outlet (such as gasoline, paper, plastic, fabrics, compressed gas containers or hydraulic lines).
2 ft. / 5 ft
If bystanders might enter the area, set up barriers to keep people at least ____from the exhaust outlet during the manual regeneration. When indoors, attach an exhaust discharge pipe rated for at least ___
5 ft. / 1500º F.
Once regeneration is complete, exhaust gas and exhaust surface temperatures will
remain elevated for____
three to five minutes.
