Section 145.112. Definitions

The following words and terms, when used in this subchapter, have the following meanings, unless the context clearly indicates otherwise:

CEMS—Continuous Emission Monitoring System—The equipment required under this subchapter or Chapter 139 (relating to sampling and testing) to sample, analyze, measure and provide, by readings taken at least every 15 minutes of the measured parameters, a permanent record of NO_x emissions.

Diesel stationary internal combustion engine—A compression-ignited two- or four-stroke engine in which liquid fuel injected into the combustion chamber ignites when the air charge has been compressed to a temperature sufficiently high for auto-ignition.

Dual-fuel stationary internal combustion engine—A compression-ignited stationary internal combustion engine that is burning liquid fuel and gaseous fuel simultaneously.

Engine rating—The output of an engine as determined by the engine manufacturer and listed on the nameplate of the unit, regardless of any derating.

Lean-burn stationary internal combustion engine—Any two- or four-stroke spark-ignited engine that is not a rich-burn stationary internal combustion engine.

Rich-burn stationary internal combustion engine—A two- or four-stroke spark-ignited engine where the manufacturer’s original recommended operating air/fuel ratio divided by the stoichiometric air/fuel ratio is less than or equal to 1.1.

Stationary internal combustion engine—For the purposes of this subchapter, an internal combustion engine of the reciprocating type that is either attached to a foundation at a facility or is designed to be capable of being carried or moved from one location to another and is not a mobile air contamination source.

Stoichiometric air/fuel ratio—The air/fuel ratio where all fuel and all oxygen in the air/fuel mixture will be consumed.

Unit—An engine subject to this subchapter.