COLUMBUS, Ind (March 21, 2011) -

Cummins Inc. (NYSE: CMI), a clean power leader in the Oil and Gas market, today announced that it has received EPA certification for the G8.3E, QSL9G, G855E and GTA855E stationary natural gas engines. These durable natural gas engines, serving the market since 2008, are certified to EPA Spark Ignition New Source Performance Standard (SI NSPS) 40CFR60, Subpart JJJJ standards, and are capable of meeting more stringent emissions regulations, such as the Texas Commission on Environmental Quality Chapter 117 requirements for ozone nonattainment areas.

To meet these stringent standards, Cummins is again employing the use of the robust Three-Way Catalyst to reduce all of the regulated emissions constituents. The use of the catalyst allows the engines to meet the Jan. 1, 2011, EPA SI NSPS requirement of 1.0-g/hp-hr NOx, 2.0-g/hp-hr CO and 0.7-g/hp-hr VOC for engines 100 hp to 499 hp (75-372 kW). The use of this sophisticated engine control and aftertreatment system gives the owner/operator the flexibility to operate in most all-gas plays, including the Dallas/Fort Worth area of the Barnett Shale.

Another technological advantage delivered with the newly certified G8.3E, QSL9G, G855E and GTA855E engines is the employment of the Cummins proprietary air-fuel ratio (AFR) control system. The Cummins AFR system, paired with the factory-matched Three-Way Catalyst, allows for optimal emissions reduction and compensates for switching sensor degradation, improving the catalyst oxygen storage and giving the unit a prolonged service life.

The AFR control system utilizes a dithering control algorithm with dual- loop for added control and responsiveness. This heightened responsiveness allows the system to better respond to changing environmental conditions such as temperature, humidity and fuel quality, in addition to operational changes such as speed, load and air intrusion. The addition of multiple sensors on the catalyst, including pre- and post-catalyst oxygen and temperature sensors, ensures that the catalyst is functioning properly and protects the engine.

The Cummins ED-3 electronic panel is standard equipment on every certified engine, providing a real-time human-machine interface. This panel eliminates the need for a technician to use a laptop computer to conduct normal system maintenance, engine adjustments and troubleshooting, saving the operator time and money.

"Cummins recognizes the industry's need for clean, durable engines. These EPA certifications emphasize our effort to meet the most stringent emissions standards and service the growing need for ultra-clean engines in developing nonattainment areas," said Rusty Downey, Cummins Gas Compression Segment Leader. "Cummins emissions control system has been in use on engines in the field since 2008. Our EPA certification is the culmination of countless hours of operating in the test cell and in the field. It allows owners and operators to forgo EPA site testing and put their Cummins engines into service right away."

About Cummins Inc.
Cummins Inc., a global power leader, is a corporation of complementary business units that design, manufacture, distribute and service engines and related technologies, including fuel systems, controls, air handling, filtration, emission solutions and electrical power generation systems. Headquartered in Columbus, Indiana (USA), Cummins employs approximately 40,000 people worldwide and serves customers in approximately 190 countries and territories through a network of more than 600 company-owned and independent distributor locations and approximately 6,000 dealer locations. Cummins earned $1.0 billion on sales of $13.2 billion in 2010. Press releases can be found on the Web at or Follow Cummins on Twitter at and YouTube at