CI ICE in the Data Center Arena
EPA 40CFR, Part 60, Subpart IIII covers CI ICE powered by liquid, gaseous, and solid fuels and built from 2007 forward. This particular article, however, focuses strictly on the compliance needs of diesel-fueled engines. EPA 40CFR, Part 60, Subpart IIII sets up four primary engine characteristics to determine what emission source restrictions must be observed and when. These characteristics are as follows:
1. Classification
2. Model year manufactured (not shipped or delivered)
3. Cylinder displacement
4. Horsepower

These characteristics are part of an elaborate and layered matrix with compliance categories tiers, which was designed to guide the overall industry implementation of these air quality standards from Day One  

 

In turn, these standards included a targeted and continual incremental reduction of allowed emissions of four pollutant groups during engine operation. The lowest and final permitted discharge levels take effect 2020

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Now in its seventh year of implementation, the current  compliance program has evolved so that Tier 4 and 5 Interim and Tier 4 and 5 Final are the only remaining categories. The four targeted pollutant groups are:
1. Nitrogen oxides
2. Particulate matter
3. Carbon monoxide
4. Non-methane hydrocarbons

Both engine manufacturers and end users are responsible for working together to achieve operational compliance. Manufacturers have to build increasingly clean burning engines; end users have to purchase the correct EPA Tier-certified engine to install (either EPA Tier 4 Interim or EPA Tier 4 Final at this point) and the appropriate engine exhaust after treatment (see Figure 1).

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