Latest SGT-800 Gas Turbines Deliver 3.5 Percent More Efficiency than Simple Cycle Gas Turbines

Press Release Summary:

Siemen offers SGT-800 gas turbines with performance enhancement. This enhancement is applied on turbines with 43-47.5-MW ratings. The new upgrade enables owners to reduce fuel usage and CO₂ emissions. Units are now offered with improved compressor blade design for increasing aerodynamic performance, optimized gas path mass flow and component cooling in the turbine section. SGT-800 turbines deliver an output of up to 53 MW and 3.5 percent lower heat rate.

Original Press Release:

Siemens Launches Performance Enhancement for Select SGT-800 Gas Turbines

Siemens has introduced a new SGT-800 performance enhancement that is applicable to all existing SGT-800 units with 43-47.5-MW ratings. The new upgrade is designed to provide owners and operators with significant fuel savings and CO₂ emissions reduction for improved sustainable energy production.

The upgrade offers up to a 3.5 percent increase of simple cycle gas turbine efficiency and up to an additional 10 megawatt (MW) output, enhancing the power of 43-47.5 MW units up to 53 MW. For combined cycle applications, the enhancement could result in a power increase of more than 20 MW and a 3.5 percent lower heat rate, based on a combined cycle 2xSGT-800 and one steam turbine. The heat rate improvement contributes to both fuel savings and CO₂ emission reductions. 

Siemens evolutionary upgrades are based on operating experience and OEM optimized design. This upgrade is infusing the components included in the later versions of the SGT-800 (50.5-54 MW). In this case, an improved compressor blade design is included for increased aerodynamic performance. Optimized gas path mass flow and component cooling in the turbine section are also included. The combined upgrades are designed to produce only a moderate increase in combustion chamber firing temperature. The upgrade is preferably installed in conjunction with a scheduled major overhaul. As it uses features from existing and proven SGT-800s with higher ratings, upgrade customers benefit from a proven and reliable technology. 

With its robust portfolio of digital service solutions, Siemens is also recommending a move from the more traditional fixed-interval maintenance based on Equivalent Operating Hours (EOH) to tailored maintenance plans in conjunction with this upgrade. A FlexLTP with a tailored maintenance plan gives users access to specific OEM knowledge and advanced optimization technologies that can also support extended time between overhauls. 

To date, more than 350 SGT-800 turbines have been sold worldwide. Over the last six years the SGT-800 has been the market-leading gas turbine for combined cycle applications in its power range. The installed SGT-800 fleet has currently reached more than six million operating hours and the fleet average reliability for 2017 was 99.7 percent (GT package). In 2017, the latest upgrade to the new unit SGT-800 was announced offering an output of 57 MW and an electrical efficiency of more than 40 percent in simple cycle application. In a combined cycle configuration, with 2xSGT-800 and one steam turbine, the power output of the new unit is 163 MW at a net efficiency of 58.6 percent. The turbine, which was originally known under the product name GTX100, began development in 1994 and was introduced to the market in 1998. 


Ms. Amy Pempel
Power Generation Services Division

Tel: +1 (407) 408-1932

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