BRACKET ASSEM. 3A2711 - Caterpillar

The ratings must be reduced to accommodate changes in the altitude. The ratings must be reduced according to the data for derating that is obtained from the test specification for the engine.All the ratings that are defined have a manufacturing tolerance of 3%.Use the following guidelines to determine the applicable engine rating.
Operating an engine at a greater power output than the engine is rated for will reduce the service life of the engine before overhaul.
Oil and Gas (E) Rating - For fire pump, offshore cranes, well fracturing, and cementing/kill pump - the power and speed capability of the engine which can be used to power high-pressure well service equipment. For C32 engines and smaller, the maximum average load factor is 35%. For well fracturing engines, the maximum average load factor is 50%, and the maximum time at rated load and speed is less than 2.5 hours per year. For cementing and kill pump engines, the maximum average load factor is 40%, and the maximum time at rated load and speed is less than 2 hours per year. When used as a fire pump and NFPA certification is required, size the pump power to 90% of the advertised rating.