Driver Power Rating

1. The motor power rating for electric motor-driven units, including service factor (if any), must be a

minimum 110% of the greatest power required for any specified operating conditions. Operating

conditions include start-up, off-design process variations, and peak loading conditions. Consider

potential excessive horsepower due to external gear and coupling losses along with process gas

vessel, piping, and/or orifice losses. See specific electric motor application requirements under

"Torsional Analysis" below.

2. Size internal combustion engine rated power for the greatest power required for any of the compressor

operating conditions plus accessory power for the specific location. Do not exceed the

engine manufacturer's rating criteria for continuous duty service. This criteria specifies the

amount of load and speed to apply without interruption after considering site altitude, temperature,

and fuel gas composition.