EPA issues final rule revising performance standards for new stationary compression ignition and spark ignition internal combustion engines
On June 28, 2011, EPA published a final rule revising the standards of performance for new stationary compression ignition (CI) and spark ignition (SI) internal combustion engines (ICE) under section 111(b) of the Clean Air Act, located at 40 CFR Part 60, Subparts IIII and JJJJ. The final rule requires more stringent standards for stationary compression ignition engines with displacement greater than or equal to 10 liters per cylinder and less than 30 liters per cylinder. The final rule also revises the requirements for CI engines with displacement at or above 30 liters per cylinder. Minor revisions were also made to the performance standards for new stationary SI ICE to correct minor errors and mirror certain revisions finalized for CI engines to provide consistency in the regulation of both types of engines.
As in the proposed rule, EPA incorporated in the final rule the standards for new marine engines for new stationary CI ICE with a displacement greater than 10 liters per cylinder and less than 30 liters per cylinder. The final standards will not take effect until 2013 at the earliest. For CI ICE with a displacement of 30 liters per cylinder or greater, owners and operators are required by the final rule to meet a standard based upon the maximum engine speed measured by revolutions per minute for engines installed prior to January 1, 2012. The final standard is more stringent for engines installed after January 1, 2012 and becomes more stringent for engines installed after January 1, 2016 when the standard presumes the use of after-treatment.
The prior 2006 new source performance standards required owners and operators to operate and maintain their engines according to the written instructions of the manufacturer or according to procedures approved by the manufacturer. The final rule allows owners and operators the flexibility to develop their own operation and maintenance plans as an alternative to following manufacturer operation and maintenance procedures. However, owners and operators using this approach will be subject to performance testing and will be required to keep maintenance plans and records.
The proposed rule would have required owners and operators of stationary CI ICE to use diesel fuel that meets the requirements for nonroad diesel fuel beginning on October 1, 2010. After receiving comments to extend that deadline, EPA revised the final rule to specify that owners and operators must merely purchase fuel that meets the nonroad diesel standards beginning on October 1, 2010. EPA also finalized a different deadline than proposed for engines with a displacement of 30 liters per cylinder or greater to transition to fuel with a sulfur content of 1,000 parts per million (ppm). The final rule requires use of fuel that meets a maximum per-gallon sulfur content of 1,000 ppm beginning June 1, 2012, while the proposed rule had set the date at January 1, 2014.
For emergency engines, the proposed rule had treated emergency engines and the allowances for maintenance and testing and non-emergency use consistently with the recent revisions to 40 CFR Part 63, Subpart ZZZZ. The final rule allows for 50 hours of non-emergency use but does not include 15 hours of operation allowed in Part 63, Subpart ZZZZ for participation in a demand response program. EPA is reconsidering the allowance for demand response operation in Part 63, Subpart ZZZZ and consequently did not finalize that allowance in this final rule.
To view a complete PDF of the Second Quarter 2011 issue of the Air Quality Letter, click HERE.