GE’s STF-G220 (GST) geothermal steam turbines offer simple and robust technology for geothermal projects and industrial low pressure expander applications. The STF-G220 custom impulse steam path with modern blade profiles lowers heat rates, reduces risk of corrosion, and ensures high scaling tolerance.
Created with Integration in Mind
The STF-G220 horizontal inlet, hot end drive and axial exhaust supports a low-level installation. A lightweight transport frame simplifies transport and installation, while the panting plate support lowers foundation interface requirements
Geothermal Turbine Configuration Flexibility
Our geothermal steam turbine can be fitted with 5-7 stages to accommodate a wide range of geothermal resource properties. It was engineered for re-staging at a later point in time to compensate for resource deterioration over time.
Durable and Robust to Reduce Corrosion Risk
Surface hardening and coating of critical areas of the STF-G220 mitigates stress corrosion risk and enables longer part life even under the harshest conditions.
STF-G220 (GST) STEAM TURBINES (GEOTHERMAL & LOW PRESSURE EXPANSION)
Key Product Features/Benefits
- Erosion and corrosion resistant materials on the STF-G220 geothermal turbine are specifically selected for their wet steam and aggressive media
- Highly efficient steam path with modern 3D impulse blading and advanced rear stage profiles
- Reduced wear and scaling buildup is in the STF-G220 double spool type governor valve is achieved by employing self-cleaning, non-contact seats made from Stellite
- Compact transport module with light but stable transport frame for simple alignment on the foundation of the turbine
- Cost effective, low-level installation is a result of axial exhaust and auxiliaries piping runs above concrete level along with STF-G220’s simplified foundation design
- Maintenance friendly architecture—the STF-G220 geothermal steam turbine has all pipe connections flanged and in the lower casing, which facilitates on-site alignment
|Main Steam||16bar (230psig) 360°C (680F)|
|Frequency||50 Hz and 60 Hz|
|Output||≤ 50 MW|
|Maximum Backpressure||≤ 300 mbar (8.9 in. Hg)|
|Control Concept||Sliding pressure mode
Fixed pressure mode