GE Energy. February 13,14 New Delhi, India

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1 GE Energy Steam Turbine Retrofits/Upgrades February 13,14 New Delhi, India

2 Agenda GE Retrofit and Upgrade Solutions Overview Design Philosophy / Steampath Features Testing and Validation Experience 2 02/14/2012

3 Steam Turbine Retrofits/Upgrades Conversions, Modifications, and Uprates Efficiency Reliability Process Change Change of Use HR Improvement Modernization Uprating Reapplied Units Optimization Life Extension Obsolescence Derating Re-Design Conversions Advanced Seals Bucket Technology Materials Advanced Aero Coatings Enabling Technology for Multiple Solutions 3 02/14/2012

4 Steampath Retrofit Solutions Product options HP section, IP section Densepack ADSP Advanced Design Steampath LP Section Upgrade LSB replacements and Rotor Replacements Larger LSB buckets for increased exhaust annulus Replacing LP Buckets Combined Cycle Retrofits SCC 4 02/14/2012

5 Benefits of GE Steampath Upgrades Upgrades Maintain high reliability with maximum performance Improved efficiency & output Advanced steam path technology Recover Degraded losses Sustained performance Minimize effect of steampath deposits Robust clearance controls Reliability / Availability Improved components/materials Advanced design/construction Enhanced asset utilization Extend time between major overhauls Maximize operability & reliability 5 02/14/2012

6 GE Design Philosophy & Steampath Features GE Proprietary Information

7 Design philosophy Develop optimal steampath configuration Drum Rotor/Carrier (HEAT TM ) and Wheel and Diaphragm Construction Optimized stage reaction Optimized stage energy Increased active lengths Increased stage count Decreased root diameter Reduced airfoil counts Advanced airfoil design Single admission or multiple admission flexibility 7 02/13/2012

8 Design philosophy Retain Interfaces same as Original 8 02/13/2012

9 Typical Features Advanced aerodynamic designs with optimized vane profiles Optimized inlet nozzle plate or box 2 nd generation integral cover buckets with new SPE coating Singlet s Diapgragms Advanced spring-backed seals, including brush seals & abradables Reduced exhaust loss (section replacement) Optimized Clearances Steam balance hole optimization Wheel space re-entry flow control SPE prevention measures Simplified assembly and installation (Boltless Support bars.) Optimized starting and loading 9 02/13/2012

10 Testing and Validation Rigorous Six Sigma Design of Experiment used in Testing Fully instrumented Test Facilities Low Pressure Development Turbine (LPDT) High Pressure Test Vehicle (STTV) Wheelbox Test Facility Schenectady, NY Aero mechanical & aero performance validation LSB technology advancement Lynn, MA Aero performance validation HP/IP technology advancement Sensor advancement Schenectady, NY Aero mechanical validation HP/IP/LP technology development 10 02/13/2012

11 Experience GE Proprietary Information

12 HP/IP Steampath Retrofits/Upgrades ADSP* Dense Pack TM (high flow applications) HEAT TM* (low flow applications) Conventional Impulse Fleet Experience 130+ upgrades MW range ~1650 turbine years of operation 2 to 4 pts nominal section efficiency Sustained performance fleet leader validation * ADSP = Advanced Design Steam Path * HEAT = High Efficiency Advanced Turbine 12 02/13/2012

13 LP Steampath Retrofits/Upgrades SCC Exhaust Loss (Btu/lb) Decrease in velocity due to increase in annulus area Decrease in Exhaust loss Fleet Experience 75+ retrofits MW range ~2000 turbine years operation Annulus Velocity (ft/sec) Increase in Backpressure 13 02/14/2012

14 Non-GE OEM Experience 14 02/13/2012

15 Non-GE OEM Experience.. Customer Manufacturer Scope A LMZ Controls Upgrade B LMZ Controls Upgrade C LMZ Controls Upgrade D LMZ Controls Upgrade E LMZ Controls Upgrade F LMZ Controls Upgrade 15 02/13/2012

16 Thank You! 16 02/13/2012

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