Usage:
All Caterpillar Spark-Ignited Engines
The following graph can be used as a quick reference to determine the site emissions [Oxides of Nitrogen (NOx)] produced by any Caterpillar Spark-Ignited Engine. The graph shows emissions (Tons per Year) versus engine horsepower (bhp) at various emissions levels (grams per horsepower-hour). The graph can be used to determine changes in site emissions at a certain horsepower, when the NOx emission level is changed. Note that changes to the engine settings and/or components may be required to achieve lower NOx emission levels.
Several examples of information obtained from the graph follow.
1. If you have an engine that is rated at 1000 hp, and it is producing NOx emissions at a rate of two grams per horsepower-hour (2 g/hp-hr), the total NOx emissions produced in a year is about 20 tons.
2. If you have a 1500 hp engine that is required to produce no more than 25 tons of NOx per year, the emissions level must be about 1.5 g/hp-hr to be within specifications.
3. If you have a site limit of 25 tons per year and an engine that is capable of producing 1 g/hp-hr, this engine could run up to 2500 hp without exceeding the site limit.
