The GT13E2 is a 50 Hz heavy-duty gas turbine originally developed by ABB and later owned by Alstom, with an installed base spanning Europe, the Middle East, Southeast Asia, and Russia. Below are the most common technical questions we receive from operators and maintenance teams. Where a question involves a part we manufacture or repair, we link to the relevant page. All technical data cited reflects published OEM documentation and our own reverse-engineering measurements.
Where can I buy Alstom GT13E2 spare parts if OEM support is limited?
ZURN Power manufactures Alstom GT13E2 spare parts independently for operators who need faster lead times, smaller minimum order quantities, or parts that the OEM has discontinued. The GT13E2 platform passed from ABB to Alstom and later to Ansaldo; many original part numbers are now obsolete or subject to long factory lead times.
We supply turbine blades and vanes, EV/SEV burners, compressor blades, rotor components, and full spares kits cross-referenced to Alstom/ABB drawing numbers. Each part ships with EN 10204 3.1 material certification, dimensional report, and OEM-spec coating documentation.
Typical lead time: 8–14 weeks for hot-gas-path castings and 4–8 weeks for machined compressor components. For an exact quote, send your Alstom part number or drawing.
What are the basic power and efficiency ratings of the GT13E2?
The GT13E2 base rating in simple-cycle configuration is approximately 164 MW at ISO conditions with a thermal efficiency of 36.5% (LHV). After the MXL turbine upgrade, output increases to roughly 187 MW with efficiency rising to approximately 38%. In combined-cycle configuration (KA13E2-1), the block typically delivers 245-260 MW at efficiency above 55%.
Key parameters:
| Parameter | Base (GT13E2) | MXL Upgrade |
|---|---|---|
| Power Output | 164 MW | 187 MW |
| Efficiency (LHV) | 36.5% | ~38% |
| Pressure Ratio | 15.0:1 | 15.4:1 |
| Exhaust Mass Flow | 525 kg/s | 536 kg/s |
| Turbine Inlet Temp | ~1,100°C | ~1,160°C |
| Exhaust Temp | 538°C | 510°C |
| NOx (DLE) | <25 ppmvd | <25 ppmvd |
For a deeper dive into hot-gas-path components that determine these performance figures, see our GT13E2 blade and vane page.
What is the difference between the GT13E2 base version (2005) and the later (2012) configuration?
The 2005-era GT13E2 and the 2012-updated variant differ primarily in the turbine hot section and control system:
- Turbine stage 1 blade alloy: 2005 uses equiaxed IN738LC with conventional TBC; 2012 uses DS (directionally solidified) or single-crystal (SX) airfoils with advanced MCrAlY+YSZ coating for higher TIT tolerance.
- Compressor discharge casing: Redesigned in the 2012 version to reduce leakage and improve stage matching. The modified casing changes the seal strip geometry and requires different abradable coatings.
- Combustion system: 2005 units typically run EV (environmental) burners; 2012 units adopt the AEV (advanced EV) burner configuration with improved premixing and lower pressure drop.
- Control system: 2005 units use Alstom's legacy controller; 2012 units are typically retrofitted with modern distributed control platforms and updated protection logic.
When ordering spare parts, it is critical to specify your unit's serial number and build date. Many hot-gas-path components (blades, vanes, transition pieces) are not interchangeable between the two versions. We resolve this at quotation stage by cross-referencing your installed configuration against our drawing database. Contact our engineering team with your unit data for a correct match.
What are the typical overhaul intervals for the GT13E2?
The GT13E2 follows a standard heavy-duty gas turbine maintenance schedule, but intervals vary by operating mode:
| Inspection Type | Base Load (hours) | Peaking / Cyclic (hours) |
|---|---|---|
| Borescope (online) | 4,000–8,000 | 2,000–4,000 |
| Hot Gas Path Inspection (HGPI) | 12,000–16,000 | 6,000–8,000 |
| Major (C-level) Overhaul | 24,000–32,000 | 12,000–16,000 |
For MXL-upgraded units operating at higher TIT, the inspection intervals may be reduced by 15–25%. Units firing liquid fuel or high-hydrogen fuel blends require more frequent hot-gas-path inspections due to accelerated hot corrosion and combustion dynamics effects. Our GT13E2 repair and overhaul services include full HGPI scope with TBC assessment, dimensional checks, and life-expansion recommendations.
What OEM part number ranges are interchangeable with your manufactured parts?
Our replacement parts are manufactured to OEM specifications and are cross-referenced against the Alstom/ABB part numbering system. Common GT13E2 part number prefixes we cover include:
| Component | OEM Part Prefix | Material |
|---|---|---|
| Stage 1 Turbine Blade | GT13E2-1-xxx, A100xxx | IN738LC / René 80 |
| Stage 1 NGV | GT13E2-2-xxx, A200xxx | IN738 / X45 |
| EV/SEV Burner | GT13E2-3-xxx, A300xxx | Hastelloy X / 304SS |
| Compressor Blade Row 1–6 | GT13E2-C-xxx | 12Cr Steel (X20Cr13) |
| Compressor Blade Row 7–15 | GT13E2-C-xxx | 17-4PH / Custom 450 |
| Combustor Liner | GT13E2-4-xxx | Hastelloy X / 310SS |
| Transition Piece | GT13E2-5-xxx | IN617 / Haynes 230 |
We also manufacture to obsolete drawing numbers that the OEM no longer stocks. Send your part number or drawing to sales@zurnpower.com and we will confirm interchangeability within one business day. For detailed specifications on turbine blades specifically, see our GT13E2 blade page.
What materials are used in GT13E2 hot-gas-path components?
The GT13E2 uses a graded material system across its hot section, reflecting the decreasing temperature gradient from the combustor exit to the exhaust:
| Component | Base Alloy | Coating | Max Metal Temp |
|---|---|---|---|
| Stage 1 Blade | IN738LC / René 80 (equiaxed, DS, or SX) | MCrAlY bond + YSZ TBC | ~980°C (base metal) |
| Stage 1 NGV | X45 / FSX-414 (cobalt-base) or IN738 | MCrAlY + TBC | ~1,050°C |
| Stage 2 Blade | IN738LC | MCrAlY or aluminide | ~870°C |
| Stage 3 Blade | IN738LC or IN792 | Aluminide (optional) | ~760°C |
| Combustor Liner | Hastelloy X | TBC on hot side | ~900°C |
| Transition Piece | IN617 / Haynes 230 | TBC on gas-washed surface | ~950°C |
Our manufacturing process begins with certified ingot material (EN 10204 3.1), followed by investment casting, HIP (hot isostatic pressing), solution and aging heat treatment, precision CNC machining, and coating application. Material certificates with full chemical and mechanical data are provided with every shipment. See our download center for material data sheets.
What is the difference between MXL and MXL2 upgrades?
The MXL (Maximum eXpansion & Load) and MXL2 are sequential turbine upgrade programs developed by Alstom for the GT13E2 fleet:
MXL Upgrade (introduced ~2005): Focused on replacing the original 3-stage turbine with redesigned airfoils for increased flow capacity and efficiency. Key changes include redesigned stage 1–3 blades and vanes with improved cooling geometry, a modified rotor cooling scheme, and an updated exhaust diffuser. Power increase: ~164 MW → ~187 MW.
MXL2 Upgrade (introduced ~2012): A further evolution with advanced aerodynamic profiling on all three stages, improved platform cooling, and updated TBC systems. The MXL2 package also includes a redesigned combustor transition piece for reduced pressure loss and improved exit temperature profile. Power output can reach ~195 MW under favorable ambient conditions.
Critical difference for spare parts: MXL and MXL2 blades, vanes, and transition pieces are not interchangeable. Each upgrade level uses unique airfoil geometry and cooling hole patterns. When ordering spares for an MXL2-equipped unit, verify the upgrade serial number. We supply parts for both configurations and can advise on the correct match from your unit data.
What fuels can the GT13E2 burn?
The GT13E2 was designed as a dual-fuel platform with the following fuel capabilities:
- Natural gas: Primary fuel. The EV/SEV combustion system achieves <25 ppmvd NOx (at 15% O₂) in premix mode without SCR for most pipeline-quality gases.
- Liquid fuel (diesel / light crude): Backup or secondary fuel. Operation on liquid fuel increases hot-gas-path inspection frequency and accelerates TBC degradation. Burner nozzles, fuel injectors, and transition pieces experience higher thermal gradients.
- Hydrogen blends (H₂ up to 30% vol): Several GT13E2 units have been validated for hydrogen co-firing in the 10–30% range by volume. Higher H₂ content increases flame speed and combustion dynamics, requiring burner modifications and updated control logic. For H₂-ready operation, the SEV burner line and fuel-gas skid typically need upgrades.
- Naphtha / LPG / propane: Occasional alternative fuels for specific project applications. Each requires a fuel-system audit and burner validation.
Fuel-switching affects hot-gas-path component life and replacement intervals. If you are planning a fuel change or hydrogen retrofit, contact our engineering team for a compatibility assessment on your existing blade, vane, and burner inventory.
What are the most common failure modes in GT13E2 hot-gas-path components?
Based on field inspections of GT13E2 units across more than 50 sites, the dominant failure modes for hot-gas-path components are:
| Failure Mode | Most Affected Components | Primary Driver | Detection Method |
|---|---|---|---|
| Creep elongation | Stage 1–2 blades, transition pieces | Sustained TIT above design limit | Dimensional measurement, metallographic replication |
| Low-cycle fatigue (LCF) | Compressor discs, rotor, blade roots | Start-stop cycles, load rejections | FPI (fluorescent penetrant inspection), eddy current |
| High-cycle fatigue (HCF) | Compressor blades, turbine airfoils | Flow-induced vibration, combustor dynamics | Modal analysis, frequency scan, post-FPI |
| Hot corrosion (Type I & II) | Stage 1–2 blades and vanes | Contaminants in fuel/air (Na, K, S, V) | TBC spallation mapping, coating thickness check |
| TBC spallation | Stage 1 blades, combustor liners | Thermal cycling, coating age, bond coat degradation | Visual inspection, thermography |
| Burner flashback / auto-ignition | EV/SEV burner tips, fuel nozzles | Fuel composition change, flame instability | Borescope inspection, pressure fluctuation monitoring |
Our repair services address all these failure modes. For TBC spallation and hot corrosion, we offer full strip/rec coating with MCrAlY+YSZ to OEM thickness specs. For creep-damaged blades, we assess remaining life and recommend repair-or-replace with documented metallurgical justification.
What is the compressor configuration and bleed air system on the GT13E2?
The GT13E2 compressor is a 15-stage axial flow design with:
- Variable inlet guide vanes (VIGVs): Rows 0 (IGV) with variable geometry for part-load optimization and starting.
- Blade materials: Rows 1–6 in hardened 12Cr stainless steel (X20Cr13); Rows 7–15 in precipitation-hardened stainless (17-4PH or Custom 450).
- Bleed air extraction: Two bleed points — one at the 6th stage (for turbine cavity sealing and anti-icing) and one at the 12th stage (for cooling air supply to the turbine hot section).
- Pressure ratio: 15.0:1 (base) to 15.4:1 (MXL), providing an outlet air temperature of approximately 385°C at full load.
Compressor blade replacement is common during major overhauls, particularly for Rows 1–3 which are subject to FOD and erosion. We manufacture complete compressor blade sets with certified material traceability and matched-weight balancing for smooth rotor assembly. See our GT13E2 spares catalog for available compressor components.
Can I get replacement parts for a GT13E2 turbine that is no longer supported by the OEM?
Yes. ZURN Power specializes in precisely this scenario. The GT13E2 product line has passed through ABB, Alstom, and Ansaldo transitions, and many part numbers have been discontinued or declared obsolescent by the current IP holder. We maintain a drawing bank covering:
- Legacy ABB drawings: Pre-2000 part numbers that Alstom no longer publishes.
- Superceded revisions: Parts updated through MXL/MXL2 programs where the original geometry differs from current production.
- Discontinued components: Items the OEM does not list yet remain in service on older units.
- Reverse-engineered parts: For components where no drawing exists, we can reverse-engineer from a sample (contact measurement or 3D scanning) with full dimensional certification.
This capability is especially valuable for operators of early-production GT13E2 units, where OEM support is limited or requires minimum-order quantities that exceed a single-outage demand. Send us your obsolete part number and we will provide a manufacturability assessment and lead time.