Turbine Combustion Four stage turbine with proven conventionally cast turbine alloys Fuel flexible and proven Ultra Low NOX combustion system Single digit emissions down to 30% load Low firing temperature for long service intervals Rotor Built disc-type rotor with radial Hirth serrations and central tie rod: Light-weight, highly rigid design with excellent start-up performance and high cycling capability Compressor Variable guide vanes for part load efficiency and transient operation Blades and vanes replaceable without rotor lift or rotor de-stacking Flexibility siemens-energy.com/gasturbines Flexible and efficient power generation with low emissions Siemens Energy is a trademark licensed by Siemens AG. External rotor air cooler for constant cooling air temperature across the ambient range