DEF Supplies

One year after the Environmental Protection Agency (EPA) 2010 heavy duty truck emission standards mandating near-zero levels of NOx (nitrogen oxide) and PM (particulate matter) went into effect, auto parts retail shelves, private fleet terminals and truck...



Packaging and placement of the aftertreatment system and size requirements for air intake systems to meet the need for increased airflow and cooling most likely required redesign of engine compartments to manage the new emissions technologies. Some equipment manufacturers will place the systems inside a reworked sheet metal skin while others will place systems in traditional locations with additional shielding and mounting hardware.

With so many different applications, Tier 4 engines and equipment have a variety of differences depending on manufacturer. These include horsepower ratings, smaller engine displacement, differing power and torque performance, higher fuel economy and other factors.

Depending on its size, Tier 4 machinery equipped with SCR will require an extra storage tank to hold up to 15 gallons of liquid DEF. DEF consumption will be dependent on equipment utilization, load factors and idle time and, like on-highway, indicator lights will warn the operator when DEF supply is running low.

Different than previous equipment in many cases, Tier 4 engines will be electronically controlled by computers that will monitor and adjust the fuel and air mixture for optimized emissions and engine performance.



Growing pressure on government and private industry to “go green” will mean that equipment owners will increasingly encounter contract specifications, job bids, project riders and contingencies that consider the emissions profile of their equipment in the award evaluation. Public projects such as transportation, facilities and infrastructure will expect use of either new or retrofitted low emissions equipment.

According to a report from the Diesel Technology Forum, “outside of California there are presently no state laws requiring the mandatory retrofitting of existing, privately owned diesel engines or equipment. However, there are a growing number of states, including Illinois, New Jersey, New York and Rhode Island, that require the retrofitting of state-owned equipment or that which is under contract to the state.”

Since some of the oldest engines and machines have 20 to 40 times the emissions levels of a new Tier 4 engine, it is projected that state and regional officials will be looking for cost-effective ways to accelerate the upgrade to new and retrofitted lower emissions technology.



Going forward beyond 2014, the industry’s focus will be on increasing fuel economy and its corresponding reduction of carbon dioxide (CO2). This focus may lead to further exploration of hybridization and more integrated use of hydrogen injection technologies, electronic motors, batteries and storage systems.

Long-term, the goal to increase fuel economy, reduce CO2 and decrease use of fossil fuels supports continued adoption and adaptation of SCR technology, increasing exponential demand for DEF supplies to serve both on-highway and off-road systems.



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