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What is the difference between DPF and DEF

October 22, 2018 by industrialquip

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There are 2 primary exhaust components to the new Tier 4 diesel engine. One is DPF, a Diesel Particulate filter, and the other is the addition of DEF, Diesel Exhaust Fluid.
DEF is the clear fluid (Urea) added to a tank attached to your diesel engine. The Urea is sprayed into the exhaust port and chemically bonds with the exhaust converting it to nitrogen and water vapor.
The Diesel Particulate Filter is a filter used to catch soot (unspent diesel burn) before it is released into the exhaust system. I know you have all seen the big cloud of black smoke that would come out of a diesel exhaust pipe when the driver steps on the accelerator. The DPF is designed to capture the soot and not release it into the atmosphere. This is a self-cleaning filter that automatically goes into cleaning or “regen” mode when it is full. Similar to a self cleaning oven that uses intense heat to incinerate any solids spilled in the oven, the regen mode uses a higher RPM to create heat to incinerate any solids caught in the DPF.
The Regen mode automatically starts when the DPF is full. If you are operating any piece of equipment that has a direct drive to the engine driveshaft, your piece of machinery will automatically without warning increase its performance.
In the pump industry, this is a problem. If you are transferring fluids at a metered rate or utilizing a hose at a certain operating pressure, the regen will start and can create major problems. As the RPM’s of the engine increase, your flow and pressures increase creating a potential safety hazard on the job. The safety hazards could include a hose blowout or overflowing a tank and causing a spill.
IndustrialQUIP has your regen solution. We meet the tier 4 efficiency regulations without the use of a DPF filter. Our engines only utilize the DEF to neutralize the exhaust gasses to Nitrogen and water. When operating at lower RPM’s, our engines will use more DEF and not risk “wet stacking” the engine. Please reach out to me to further discuss your pump solutions david@industrialquip.com

Filed Under: Equipment Insight

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