What Are Aero-Derivative Gas Turbines?
Aero-derivative gas turbines are one of the most important classes of power generation and mechanical drive equipment in the world. Derived from commercial and military jet aircraft engines, they combine the high performance of aviation technology with the reliability requirements of continuous industrial service.
How Aero-Derivative Turbines Work
An aero-derivative gas turbine starts with a gas generator — the core of an aircraft engine — and adapts it for industrial use. The gas generator compresses air, mixes it with fuel, and combusts the mixture to produce a high-energy exhaust stream. A separate industrial power turbine then extracts shaft power from that exhaust stream to drive a generator or compressor.
The key advantage of this architecture: the gas generator can be removed and replaced as a module, enabling rapid maintenance and overhaul without a full plant shutdown. This "hot section swap" capability is a major operational advantage for applications requiring high availability.
Aero-Derivative vs. Heavy-Frame Gas Turbines
There are two main classes of industrial gas turbine:
Aero-Derivative Gas Turbines
- Derived from aircraft jet engines
- Output range: approximately 5–65 MW
- High efficiency at part load
- Fast start (2–10 minutes to full load)
- Lightweight and compact — can be shipped and installed on skids or trailers
- Modular hot section for rapid overhaul
- Best for: peaking power, offshore, mobile, pipeline, and CHP applications
Heavy-Frame (Industrial) Gas Turbines
- Purpose-built for industrial service from the ground up
- Output range: 30–500+ MW
- Optimized for base-load, continuous operation
- Slower start times
- Much larger and heavier — requires permanent foundation
- Best for: large base-load power plants and combined-cycle plants
Most assets traded on Turbine-Trader.com are aero-derivative turbines in the 10–65 MW range — the most active segment of the used gas turbine market.
Major Aero-Derivative Turbine Families
GE Aero-Derivatives (LM Series)
General Electric's LM series are among the most widely deployed aero-derivatives in the world. Derived from GE's commercial and military aircraft engines:
- GE LM1600 — 13–14 MW, derived from the F404 military engine
- GE LM2500 — 22–34 MW, derived from the TF39/CF6. The world's most widely deployed aero-derivative.
- GE LM6000 — 40–58 MW, derived from the CF6-80C2. Highest efficiency in its class.
Rolls-Royce Aero-Derivatives
Rolls-Royce's industrial gas turbines are derived from the RB211 and Trent aircraft engine families:
- RB211 — 24–37 MW, three-shaft design. Large installed base in pipeline and offshore.
- Trent 60 — 51–64 MW, derived from the Trent 800. Targets LNG and large power applications.
Pratt & Whitney Aero-Derivatives
- FT4 — 25–28 MW, derived from the JT4. Large North American peaking and pipeline fleet.
- FT8 — 25–30 MW, derived from the PW2037. Higher efficiency than FT4, available as MOBILEPAC trailer unit.
Siemens Industrial Gas Turbines
Siemens' SGT series spans both aero-derivative and industrial designs. The SGT-A35 (formerly the RB211) is a pure aero-derivative; others like the SGT-800 are purpose-built industrial designs with aero-derivative influence:
- SGT-400 — 12–13 MW, oil & gas service
- SGT-500 — 17–19 MW, three-shaft, large Scandinavian fleet
- SGT-700 — 32–33 MW, DLE combustion
- SGT-800 — 47–57 MW, high availability base-load turbine
Solar Turbines
Solar Turbines (a Caterpillar company) manufactures the Titan series — rugged industrial turbines in the 15–22 MW range favored for upstream oil and gas and pipeline compression.
Common Applications
Peaking Power Generation
Aero-derivatives excel in peaking power — generating electricity during periods of peak grid demand. Their fast-start capability (2–10 minutes vs. 30+ minutes for heavy-frames) means they can respond rapidly to grid signals. The GE LM2500 and Pratt & Whitney FT8 are particularly common in this application.
Offshore Oil & Gas
Weight and footprint are critical on offshore platforms. Aero-derivatives are significantly lighter than comparable-output heavy-frames, making them the default choice for offshore power generation and gas compression. The Rolls-Royce RB211 and GE LM2500 dominate North Sea and Gulf of Mexico installations.
Pipeline Gas Compression
Natural gas pipelines require compression stations every 50–100 miles to maintain pressure. Aero-derivatives — particularly the RB211, FT4, and Solar Titan — power many of these stations globally, providing reliable mechanical drive for pipeline compressors.
LNG Processing
LNG liquefaction requires massive compressor drives. The Rolls-Royce Trent 60 and GE LM6000 are deployed at LNG projects worldwide, providing the high output and efficiency required for economical liquefaction.
Mobile & Deployable Power
Trailer-mounted aero-derivative packages — like the Pratt & Whitney FT8 MOBILEPAC — can be transported to a site and generating power within hours. This makes them valuable for disaster response, military applications, and temporary power needs.
The Used Aero-Derivative Market
Aero-derivative gas turbines have long service lives — 25+ years with proper maintenance — and retain significant value on the secondary market. When utilities decommission plants, or oil companies sell assets, the turbines enter the used market through specialized brokers.
The used market offers substantial cost savings versus new equipment (typically 30–70% less), with delivery timelines often faster than new orders, which can have multi-year lead times from OEMs.
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