Efficiency UpgradesEfficiency upgrades involve rebuilding the turbine with modern high-efficiency components, usually nozzles, buckets, valves, and seals. On older units, performance losses are primarily caused by changes in nozzle and bucket throat areas, blade profiles, and deterioration of finishes and increased clearances. New efficiency features not only recover the degradation, but can also improve efficiency levels by four to six percent above the original unit performance. An efficiency upgrade on a unit running over thirty years can recover 10 percent degradation and increase performance 5 percent beyond its original level. Reliability UpgradesReliability upgrades are achieved by rebuilding the turbine with higher reliability components to provide extended turbine life. The upgrades usually involve steam path replacement using new-generation nozzle, bucket and rotor components or other engineered systems. History has shown steam turbine reliability decreases beyond 20 years of service. Under typical conditions, a unit’s forced outage rate can increase three to four percent every ten years. A GE reliability upgrade arrests this trend and modernizes your unit for significant life extension and operational reliability into the future. Plant or Process ChangesYour turbine may need to be redesigned or re-rated to accommodate changes in plant or process parameters, such as new throttle, extraction, admission and exhaust conditions. We evaluate the new requirements to determine the modifications required for optimal operation at the new conditions. Specific conversions include:
Reapplication or Change of UseWe can determine whether an existing turbine can be reapplied at a different site or to a different plant application and identify any changes required. |
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