Dynamic Inspection Intervals for Vintage Steam Turbine Generators Operating in Flexible Dispatch Mode

摘要

Both the LP and the HP dynamic inspection methods are designed to evaluate areas of life expenditure. Based on a unit’s actual operational profile and not assumed duty cycle, more representative inspection intervals can be determined frequently and updated inspection intervals set based on a specific life limiting parameter for a given design. If the unit experiences lower temperature operation than design or has a more base-loaded operating profile than the reinspection interval was set on, then the current reinspection intervals may be too frequent. However, if the unit is operating at higher than design conditions or is cycling much more frequently, then the reinspection intervals may need to be more frequent. A proactive approach to operational based damage mechanism evaluations allows for more realistic reinspection intervals for a given design type.