Proposed Reciprocating Internal Combustion Engine RICE Rules

Update:  January 2013 - EPA Released Final RICE NESHAP

On March 5, 2009, EPA published new proposed 40 CFR Part 63 rules for reciprocating internal combustion engines (RICE). The rules would affect:

• Engines at facilities classified as "Area Sources" with hazardous air pollutant (HAP) emissions less than 10/25 TPY.
• Engines with horsepower rating less than 500 at major source facilities and constructed/reconstructed before June 12. 2006.
• Engines with horsepower rating greater than 500 at major source facilities and constructed/reconstructed before December 12, 2002.

EPA expects that the new emissions limits would be met by installing "after-treatment" controls such as:

• Existing rich-burn engines would install non-selective catalytic reduction (NSCR).
• Existing diesel engines would install oxidation catalysts and/or catalyzed diesel particulate filters (CDFP).
• Non-emergency engines with greater than 300 horsepower would burn ultra-low sulfur fuel.

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