1. GT13E2 Overview
The GT13E2 is a 50 Hz heavy-duty gas turbine originally developed by ABB (Asea Brown Boveri) in the late 1980s as part of the GT13 family. It has since passed through Alstom and is now part of the GE Vernova portfolio following GE's 2015 acquisition of Alstom's power and grid businesses. With more than 400 units sold and over 10 million operating hours accumulated worldwide, the GT13E2 is one of the most successful F-class turbines in the 50 Hz market, serving utilities, independent power producers, and industrial users across Europe, the Middle East, Asia, and Latin America.
The turbine is a single-shaft design with a 15-stage axial compressor, an annular EV (Environmental) dry-low-NOx combustion system, and a 3-stage turbine section. Its modular architecture makes it well-suited for both simple-cycle peaking duty and combined-cycle baseload operation. The GT13E2 has been progressively upgraded through three main variants — the original V96, the MXL, and the MXL2 — each improving output and efficiency while maintaining the same fundamental architecture and footprint. ZURN Power supplies spare parts and repair services for all three variants, with reverse-engineering capability for obsolete components. For component-specific information, see our pages on GT13E2 blades, nozzle guide vanes, EV burners, rotor components, and compressor parts.
2. Key Performance Specifications
The following table consolidates the published technical data for the GT13E2 across its three production variants. All values are at ISO conditions (15°C, 1013 mbar, 60% relative humidity) unless otherwise noted. Actual site performance varies with ambient temperature, altitude, humidity, inlet/outlet losses, and fuel composition.
| Overall Performance (Simple Cycle, ISO) | ||
| Parameter | V96 (Baseline) | MXL / MXL2 |
|---|---|---|
| Net power output | 172 MW | 183 / 190 MW |
| Net electrical efficiency | 37.5% | 38.2% / 38.5% |
| Heat rate (LHV) | 9,610 kJ/kWh | 9,420 / 9,350 kJ/kWh |
| Exhaust mass flow | 529 kg/s | 535 / 540 kg/s |
| Exhaust temperature | 540°C | 545 / 548°C |
| Pressure ratio | 15.8 : 1 | 16.2 / 16.6 : 1 |
| Turbine inlet temperature (TIT) | ~1,100°C | ~1,140°C |
| Rotational speed | 3,000 rpm (50 Hz) | |
| Combined Cycle Performance (1+1 Configuration, KA13E2) | ||
| Combined cycle output | ~260 MW | |
| Combined cycle efficiency | ~58% | |
| Steam turbine output | ~88 MW | |
| Emissions | ||
| NOx (at 15% O2) | < 25 ppm (natural gas) | |
| CO (at 15% O2) | < 10 ppm | |
| Physical Dimensions | ||
| Overall length | ~11 m | |
| Overall width | ~4.5 m | |
| Overall height | ~4.5 m | |
| Turbine weight (complete) | ~430 tons | |
| Rotor weight | ~100 tons | |
3. Variant Comparison: V96 vs MXL vs MXL2
The GT13E2 has been upgraded twice since its introduction. Both upgrades — MXL and MXL2 — are backward-compatible drop-in upgrades, meaning they use the same footprint and can be installed during a scheduled major overhaul without modifying the foundation or auxiliary systems.
Key Upgrade Features
- MXL upgrade: Improved compressor aerodynamics through re-profiled blading, upgraded Stage 1 turbine blade cooling design, and increased mass flow. Delivers +11 MW output and +0.7 percentage points efficiency.
- MXL2 upgrade: Introduces additive-manufactured (3D-printed) burner components for improved fuel-air mixing, further compressor blade optimization, and enhanced TBC coatings on hot-gas-path components. Delivers +7 MW additional output over MXL and reduced NOx emissions. The MXL2 also extends component inspection intervals, reducing lifecycle maintenance costs.
- Commonality: All three variants share the same rotor configuration, casing interface, and foundation footprint. A V96 unit can be upgraded to MXL2 during a major overhaul by replacing compressor blades, turbine blades/vanes, and burner components — the rotor disc forgings and casings remain in service.
4. Compressor Architecture
The GT13E2 compressor is a 15-stage axial flow design with a pressure ratio of 15.8:1 (V96) to 16.6:1 (MXL2) and an inlet mass flow of approximately 529–540 kg/s. It features variable inlet guide vanes (IGV) and variable stator vanes on the first stages, which allow efficient operation across a wide load range (down to approximately 40% load) while maintaining stable compressor aerodynamics.
Single-shaft design with progressive area reduction. Stages 1–3 have variable stator vanes for part-load stability. Inlet guide vanes (IGV) modulate mass flow for load control and exhaust temperature management in combined-cycle operation.
- Pressure ratio: 15.8–16.6:1
- Mass flow: 529–540 kg/s
- Variable stages: IGV + S1–S2
- Blade material: 12Cr steel (R1–R8), 17-4PH (R9–R15)
The annular combustor uses ABB's proprietary EV (Environmental) burner technology — a dry low-NOx premix system that achieves sub-25 ppm NOx without water or steam injection. The annular design eliminates individual flame tubes and transition pieces, reducing pressure drop and improving durability.
- Burner count: ~30 EV burners (annular ring)
- NOx: <25 ppm (@ 15% O2, natural gas)
- CO: <10 ppm
- Fuels: natural gas, light distillate, dual-fuel
- MXL2: additive-manufactured burner heads
Three axial stages expand the gas from TIT (~1,100–1,140°C) to the exhaust temperature of 540–548°C. Stage 1 blades are the most critical hot-gas-path component, using nickel superalloys with internal air cooling and thermal barrier coatings (TBC).
- Stage 1 blades: IN738LC / DS René 80, TBC coated
- Stage 2–3 blades: IN738LC equiaxed
- NGV material: IN939 / IN738LC
- Cooling: convection + impingement + film cooling
- Rotor: welded drum design
For spare parts related to each architecture section, see our compressor components, EV burner parts, turbine blades, nozzle guide vanes, and rotor components pages.
5. Design History & Heritage
The GT13E2's design lineage spans three major OEMs over 35 years, which is why operators frequently encounter parts marked "ABB," "Alstom," or "GE" for the same machine. ZURN Power's reverse-engineering capability is particularly valuable for older V96 units where original ABB documentation may be incomplete or unavailable.
6. Applications & Use Cases
The GT13E2 serves a broad range of power generation applications across 50 Hz markets. Its flexibility — from baseload combined-cycle to fast-start peaking — makes it a versatile asset for utilities and industrial users.
7. Maintenance Intervals & Lifecycle
The GT13E2 follows a structured inspection regime based on equivalent operating hours (EOH), which factors in starts, trips, and load variations. The two primary maintenance events are the Hot Gas Path Inspection (HGPI) and the Major Overhaul.
| Maintenance Event | Interval (EOH) | Scope |
|---|---|---|
| Combustion Inspection (CI) | 8,000–12,000 | Burner inspection, combustion liner check, fuel nozzle cleaning |
| Hot Gas Path Inspection (HGPI) | 24,000 | Blades, vanes, TBC inspection, cooling passage inspection, rotor inspection |
| Major Overhaul (C-Inspection) | 48,000 | Full rotor removal, disc NDT, bearing inspection, casing inspection, complete re-blading as needed |
| Borescope Inspection | 4,000–6,000 | Non-intrusive internal inspection via borescope ports |
Critical Spare Parts to Hold in Stock
For operators managing GT13E2 assets, the following components have the longest procurement lead times and should be pre-stocked or on a framework supply agreement to avoid outage delays:
- Stage 1 turbine blades — longest lead item (new manufacture 8–14 weeks via independent supplier; 12–18 months via OEM). See GT13E2 blade page.
- Stage 1 nozzle guide vanes — second-longest lead, often requires re-casting. See GT13E2 vane page.
- EV burner heads — MXL2 additive-manufactured variants are OEM-only; standard EV burners available from independent suppliers. See GT13E2 burner page.
- Compressor blades (R1–R3) — front-stage blades subject to FOD and erosion. See GT13E2 compressor page.
- Rotor discs — long-lead forgings, typically planned 12+ months ahead. See GT13E2 rotor page.
- Combustion liners / transition pieces — consumable items replaced or refurbished at each HGPI.
- Seals and gaskets — full HGPI gasket kit should be pre-stocked.
ZURN Power holds stock of frequently needed GT13E2 components at our Hong Kong logistics hub, with same-day dispatch for outage-critical requests. Contact us for availability and lead times.
8. Operational Reliability & Installed Base
The GT13E2 has a proven operational track record across diverse environments and duty cycles:
- Installed base: 400+ units across 40+ countries
- Operating hours: 10+ million accumulated hours
- Start reliability: >97%
- Availability: >95% (typical fleet average)
- Start cycle: Normal start to full load in ~10 minutes (simple cycle); ~30 minutes (combined cycle with warm HRSG)
- Ramp rate: Up to 10 MW/minute
- Fuel flexibility: Natural gas (primary), light distillate oil (backup), dual-fuel capability with automatic switchover
- Load range: Stable operation from ~40% to 100% load with IGV modulation
The large installed base means that spare parts are in continuous demand, and independent suppliers like ZURN Power can provide faster lead times than the OEM for many components — particularly for V96 variant parts that GE may no longer actively stock.
9. Key Differences from Other F-Class Turbines
Engineers evaluating the GT13E2 against comparable F-class machines should note several distinctive design features:
- Annular combustor vs. can-annular: The GT13E2 uses an annular combustion chamber with EV burners, while many GE-designed F-class turbines (e.g., 7FA, 9FA) use can-annular combustion systems with individual flame tubes. This affects the spare parts inventory — the GT13E2 needs burner heads and liner segments rather than complete combustion cans.
- 3-stage turbine vs. 4-stage: The GT13E2's 3-stage turbine has fewer stages than some competitors' 4-stage designs, resulting in higher per-stage loading but a shorter rotor. This means each stage carries more work and the Stage 1 blades see particularly severe duty.
- Welded drum rotor: Unlike bolted disc rotors used in some Siemens turbines, the GT13E2 uses a welded drum rotor design. This eliminates disc-to-disc bolted joints but makes rotor disassembly more complex — individual discs cannot be replaced without cutting welds.
- 50 Hz only: The GT13E2 is designed exclusively for 50 Hz markets (3,000 rpm). GE's 60 Hz equivalent in the same output class is the 7FA series. Operators in 60 Hz markets (North America, parts of Japan, Saudi Arabia) cannot use the GT13E2 without a frequency converter.
- OEM heritage complexity: Parts may be documented under ABB, Alstom, or GE part numbering systems. ZURN Power maintains cross-reference databases covering all three naming conventions to ensure correct part identification.