ENGINE AR 1660273 - Caterpillar

TYPE="LEVEL" DEPTH="1" @@@-->Industrial Rating Definitions
The application examples are listed for reference only. Refer to the specific application information and guidelines within the Technical Marketing Information for exact rating determination.A Rating (Continuous)
* For heavy-duty service when engine is operated at rated load and speed up to 100 percent of the time without interruption or load cycling.* Time at full load up to 100 percent of the duty cycle.* Typical examples are: pipeline pumping, ventilation, and customer specifications.B Rating
* For servicing where power and/or speed are cyclic.* Time at full load not to exceed 80 percent of the duty cycle.* Typical examples are: irrigation where normal pump demand is 85 percent of the duty cycle, oil field mechanical pumping and drilling, and stationary/plant air compressors.C Rating (Intermittent)
* For service where power and/or speed are cyclic* The horsepower and speed capability of the engine can be used for one uninterrupted hour, followed by one hour of operation at or below the A rating.* Time at full load not to exceed 50 percent of the duty cycle.* Typical examples are: agricultural tractors, harvesters and combines, off-highway trucks, fire pump application power, blast hole drills, rock crushers and wood chippers with high torque rise, and oil field hoisting.D Rating
* For service when rated power is required for periodic overloads.* The maximum horsepower and speed capability of the engine can be used for a maximum of 30 uninterrupted minutes, followed by one hour of followed by one hour of C rating operation.* Time at full load not to exceed 10 percent of the duty cycle.* Typical examples are: offshore cranes, runway snow blowers, water well drills, portable