Auxiliary Turbine System Reliability Upgrades

• Replace gland leakage condenser with nozzle spray chamber
• Replace steam ejector with gland exhaust vacuum pump
• Convert mechanical-hydraulic to pneumatic steam seal operator
• Convert NRVs to pneumatic operation

Brush Seal

• Based on successful GE Aircraft Engines and gas turbine seal evolution, advanced brush seals minimize leakage by as much as 70 percent

Casing Modifications

• Add/modify extraction openings
• Convert condensing to non-condensing
• Add borescope ports for inspection of steam path
• Casing and diaphragm inlays for erosion repair

Condensing End Buckets

• New SCHLICT twisted/tapered Vortex bucket designs for improved section reliability and performance
• Generator drive: Upgrade LP stage and section with new-generation SCHLICT bucket and nozzle forms
• Mechanical drive: Variable speed buckets with harmonically-tuned nozzles, larger setbacks and long bands to reduce low frequency vibration stress
• Replace brazed strips with flame-hardened or solid material tall buckets for improved erosion resistance

Control System Upgrades

• Convert mechanical hydraulic controls or early-generation electrohydraulic controls to modern microprocessor-based type
• Electronic controllers and hydraulic interfaces available for significant performance and reliability benefits
• Convert mechanical bolt overspeed trips to high reliability electronic type

Exhaust End Improvements

• Convert cast iron to fabricated steel
• Temperature-controlled exhaust hood sprays
• Refurbished or new turning gears for controlled startup and shutdown
• Convert gear couplings to modern disk-type couplings
• Upgrade grounding brush and shaft voltage monitors for improved reliability

Head End Buckets

• Advanced SCHLICT cylindrical profiles for performance and reliability improvements
• Flat skirt for more strength; round skirt for more efficiency
• Locking buckets where applicable
• SPE protection Plasma Spray coatings

Leakage Control Improvements

• Improved hi-lo labyrinth shaft packing to reduce leakage
• Improved HP nozzle box packing for higher reliability
• Advanced buckets and spill strips for improved efficiency

Journal Bearings

• Convert to tilt pad design for improved load capacity and rotor stability

Lubricating and Hydraulic Systems

• Refurbished, uprated or new oil hydraulic systems
• High pressure hydraulic unit and valve actuators for faster valve response
• Replace shaft or steam turbine driven oil pumps with motor-driven pumps
• Oil pump rebuilds or capability upgrades
• Add full flow duplex filters, dehydrators, and vapor extractors

Nozzles and Diaphragms

• Modern designs with advanced nozzle profiles and improved structural design for enhanced reliability and performance
• Welded nozzle plate replacements
• Solid particle erosion hard facing nozzle protection

Rebuild Existing Rotor

• Factory inspection and refurbishment
• Wheel dovetail inspection
• Rotor welding: dovetail, wheel, shaft end and fine-line welding
• Shrunk-on wheel refurbishment
• Bucket replacement
• Low-speed and high-speed balance

New Rotor Forging

• Enables new staging with modern buckets
• Solid rotor construction eliminates shrunk-on wheels, thrust collar and coupling hubs for higher reliability
• New forgings with modern materials and NDT standards

Steam Valves (cam-lifted)

• Higher efficiency valve conversions; upgraded designs for valve seats, disks/stems/bushings; cam shaft, sector gear, no-maintenance DU bearing replacements; and improved clevis design

Steam Valves (bar-lifted)

• Conversion from multi-piece to solid valves with split lift beam to reduce wear and vibration
• Valve seat, disk, stem and bushing upgrades

Thrust Bearings

• Tapered land to tilt pad conversions for higher load capability and misalignment tolerance

TSI Monitoring

• Complete range of vibration, temperature and displacement sensors and monitors