Clean School Bus USAClean School Bus USA and and Ultra Low Sulfur Diesel Ultra Low Sulfur Diesel

Dale Aspy, EPA Region 4Dale Aspy, EPA Region 4February 10, 2006February 10, 2006

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ULTRA LOW SULFUR DIESEL:WHY?

• ULSD is needed to reduce emissions from existing engines and enable new diesel emission control technologies

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ULTRA LOW SULFUR DIESEL: WHEN?

• ULSD will be commercially available by October 15, 2006 or earlier. All 2007 and newer diesels must be fueled by ULSD. It will be produced by refiners by June 1, 2006 and in terminals by September 1, 2006.

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ULTRA LOW SULFUR DIESEL: WHAT?

• ULSD has less than 15 ppm sulfur

• Lubricity specification < 520 HFRR by D 6079 from ASTM D 975

• Aromatics: Now about 15-40% but can drop by 3-4% in ULSD. Extreme cases below 10%.

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ULTRA LOW SULFUR DIESEL: WHERE?

• ULSD is required nationally. Refiners have indicated they will be able to supply. Contact your fuel supplier. All 2007 and newer vehicles must use it.

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ULTRA LOW SULFUR DIESEL: WHO?

• All 2007 and newer diesels must use ULSD

• Pumps must be labeled with type of diesel

• DPF equipped buses

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ULTRA LOW SULFUR DIESEL:HOW?

• Planning and preparation will critical.

• Discuss issues with fuel suppliers

• Prepare tanks, pumps, pipes

• Consult engine suppliers

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Maintenance Practices

• Good maintenance is necessary to maintain low emissions and proper engine performance.

• Exhaust leaks should be sealed.• Before installing aftertreatment

technologies, oil consumption should be monitored and should not exceed engine manufacturer specifications.

• Crankcase oil burning systems may not be used with aftertreatment technologies.

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Maintenance Practices

• Fuel Filters may need replacement when introducing new fuels– Biodiesel typically requires tank cleaning and filter

replacement– ULSD – filter replacement may be advisable

• New engine technologies may require periodic maintenance

• crankcase emission control systems may have filter change intervals

• diesel particulate filters may need periodic cleaning

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Proactive Vehicle Maintenance Practices

• Experience indicates be proactive

• Check maintenance records for seal replacement at recommended intervals with recommended materials-specify materials

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Infrastructure Considerations

• Tank cleaning or preparation• Manifolds and valve

considerations• Power take offs • Hoses

• Consult Fuel provider!

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Guidance from Manufacturers, Fuel Providers

• Cummins

• http://www.blueridgediesel.com/CUMMINS%20TSB_082905%5B1%5D.pdf

• Chevron

• http://www.chevron.com/products/prodserv/fuels/diesel/documents/elastomer_chevron_tb_2005Aug.pdf

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Bottom Line

• Consult

Consult

Consult

Talk with Engine Manufacturers and Fuel Providers

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For more information...

• Dale Aspy 404-562-9041

• Rachel White 404-562-9044

• Alan Powell 404-562-9045