Extended Maintenance

Thanks to more than 12,000,000 cumulative EOHs and an intensive analysis of site data on component life consumption, Ansaldo Energia’s R&D department has introduced a new formula of Weighted Operating Hours (WEOH). This formula takes into account the real damage accumulation rate due to fatigue and creep effects on GT components - especially during partial loads, high load gradients and a high number of start-ups - which characterize typical operating profiles.More accurately describing actual degradation rates based on plant load profile, the WEOH formula can lead to a factual load-oriented definition of maintenance major outage intervals. In case of partial load predominance, the operating days between major outages can be substantially increased (up to + 20%).

WEOH=EC(start type,loading and thermal cycles)+EFH(operation type,fuel,water/ steam inj.)

The WEOH formula is based on two different elements: the Equivalent Cycle (EC) taking into account the fatigue, and the Equivalent Firing Hours (EFH) taking into account the creep.The coefficients for the new formula have been defined on the basis of Finite Elements thermo-structural calculation, crossed with evidence from real components.

The WEOH formula introduction allows an increase of the maintenance interval with respect to the EOH calculation, by means of weightings each start and each firing hours on the basis of their real life consumption of Turbine B&Vs.

Operation increase from EOH to WEOH

WEOH

N° o

f Sta

rts/

Ec

EOH/WEOH

EOH

How You BenefitThis upgrade allows the customer to extend the maintenance cycles of all AE/V94.2/SGT5-2000E and or AE/V94.3A/SGT5-4000F Gas Turbine Models.

Based on the technical features to be installed, the required upgrade may require advanced planning prior to a scheduled Major Overhaul inspection.

*See the AE94.2 MXL brochure**See the AE94.2 MXL2 brochure***See the AE94.3A MXL brochure****See the AE94.3A MXL2 brochure

Customer benefits• Significant reduction of maintenance costs (more than 25%)

• Improved and extended cash flow

• Increased average availability factor (up to + 0.6 points)

• Global reduction of Gas Turbine Life Cycle Cost

teChniCal features• Introduction of new Weighted Operating Hours counter

• Hot gas path air cooling optimization

• Installation of the Improved HGP components

Old HGP Components configuration 33 KEOH 25 KEOH

HGP as per AE94.2MXL* 41 KEOH / 900 starts50 KWEOH / 1200 EC

33 KEOH / 900 starts41 KWEOH / 1200 EC

33 KEOH / 900 starts41 KWEOH / 1200 EC

HGP as per AE94.2MXL2**41 KEOH / 1200 starts 50 KWEOH / 1500 EC

Power modemaintenance modeae94.2 Configurations

Old HGP Components configuration

41 KEOH / 900 starts50 KWEOH / 1200 EC

HGP as per AE94.3A MXL*** 33 KEOH / 900 starts41 KWEOH / 900 EC

25 KEOH / 900 starts33 KWEOH / 900 EC

HGP as per AE94.3A MXL2****

25 KEOH / 500 starts

Power modemaintenance modeae94.3a configurations

Legend:eoh: Equivalent Operating HoursWeoh: Weighted Operating HourseC: Equivalent cycle

Extended Maintenance Cycles can be achieved as per the table below:

Technical SpecificationsSee the following technical leaflet: 1. AE94.2 MXL2. AE94.2 MXL23. AE94.3A MXL4. AE94.3A MXL2

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