SGT-500 Gas Turbine

Introduced to the market in the 1950s, the Siemens Energy SGT-500 (formerly known as GT35) is an industrial gas turbine, with applications in power generation/cogeneration, and the mechanical drive of compressors and pumps. It is a reliable turbine which can operate on a wide range of gaseous and liquid fuels. SGT-500 fleet consists of several variants with an output of 11 to over 19MW. Later Version can be equipped with a Dry Low Emissions (DLE) combustion system, providing extremely low NOx levels for gas fuels.


Contact us

Why Siemens Energy as your service provider?

  • Original Equipment Manufacturer (OEM) and expert in this technology
  • Over 70 years of gas turbine experience
  • Operational presence in 90+ countries
  • A global service operation centre with emergency stock
  • Expert technical support
  • Availability of OEM spare parts
  • Availability of Engine exchange pool

Our services offerings for the SGT-500

As the Original Equipment Manufacturer (OEM), Siemens Energy benefits from a global network of expertise and designs, manufactures, sells, and offers service support products for gas turbines and their associated equipment,  to suit the specific service requirements of each operator.

Highlights of the SGT-500 gas turbine

The Siemens SGT-500 industrial gas turbine is a highly dependable gas turbine with excellent fuel flexibility. It combines the reliability and robustness of an industrial design and low emission levels of the latest turbine technology for a wide variety of fuels and applications at low operational costs.

  • Over 180 turbines have been installed worldwide
  • More than 10 million Equivalent Operating Hours (EOH)
  • More than 225,000 Starts

  • Robust design – long engine life
  • High availability/reliability
  • Low fuel-gas pressure requirement
  • No advanced sealings, resulting in minimal deterioration and maintained efficiency
  • Dry Low Emissions (DLE) system option
  • Low starting power (<160 kW)
  • Fast start capability (~3 minutes)
  • Dual fuel
  • Competitive with dual-fuel reciprocating technology
  • Marine classified
  • No methane slip


  • Power generation: 19.1 MW(e)
  • Electrical efficiency: 34.8 % (MD) / 33.6 % (PG)
  • Heat rate: 10,651 kJ/kWh (10,095 Btu/kWh)
  • Power turbine speed: 3,600 rpm
  • Compressor pressure ratio: 13:1
  • Exhaust gas flow: 97.9 kg/s (215.9 lb/s)
  • Exhaust temperature: 376° C (709° F)
  • NOx emissions (with DLE corrected to 15 % O2 dry) Natural gas: ≤42 ppmV


  • 4-pole design
  • Rated voltage: 10.5 kV/11.0 kV/13.8 kV
  • 50 Hz or 60 Hz
  • Protection IP54
  • PMG for excitation power supply
  • Complies with IEC/EN 60034-1 Standard Axial Compressor
  • Two multi-stage (10 + 8 LP/HP) axial flow compressors
  • Compressor rotors of bolted design
  • Corrosion-coating available Combustion
  • 7 can-annular combustion chambers
  • Conventional combustion system
        - Steam or water injection for emissions control and power augmentation
  • Dry Low Emissions (DLE) combustion system option (gas only)


  • Two compressor turbines (1 + 2 HP/LP)
  • Free power turbine of axial-flow design
  • 3-stage 3,600 rpm turbine

Fuel System

  • Natural gas - Liquid fuel - Dual fuel - Heavy fuel
  • Other fuel capability available on request
  • Fuel-changeover capability at any load
  • Load-rejection capability


  • Hydrodynamic radial- and thrust bearings of tilting pad type
  • Vibration Fuel-supply pressure requirement: 18.0 bar(a) ± }0.5 bar (261 ± }7 psi(a))


  • Parallel-shaft gear of double helical design
  • High-speed shaft 3,600 rpm (nominal speed for PG)
  • Low-speed shaft 1,500 rpm (50 Hz) or 1,800 rpm (60Hz)
  • 4 radial bearings of sleeve type


  • Start and barring motor connected to the LP rotor via a ratchet coupling

Control System

  • Siemens Simatic control system
  • Distributed inputs/outputs

  • Extremely low and predictable maintenance costs
  • Easy on-site maintenance possible - complete modules can be swiftly exchanged
  • Direct exchange of gas generator possible - Core can be air-freighted
  • First overhaul after 40,000 hours (80,000 hours between major overhauls)
  • Lease-engine availability for planned overhauls
  • Online wash available
  • Standardized concepts for time-based and cycle-based maintenance
  • Staff training in operation and maintenance

Contact us