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GTG_1572TGD_MS6001FA_50Hz.doc

1 x 1997 GE FM 6FA 87.5MW 50Hz Combined Cycle Cogeneration Plant

The asking price is US $7.55 MM as is where is.

Plants are still operating and will be in shutdown mode in about 2-6 months

Download 6FA Maintenance Summary

They are coordinating a plant visitation in about 60 days so potential buyers can meet with GE representatives about LTSA and maintenance issues.

The 90MW GE Frame 6FA plant is still under GE LTSA (Long Term Service Agreement), it’s a complete combine cycle plant.

1 SCOPE OF THE DOCUMENT....................................................... 42 DEFINITIONS AND ABBREVIATIONS ......................................... 43 POWER PLANT GENERAL DESCRIPTION ................................ 54 PERMANCES AND EMISSIONS .................................................. 94.1 HV GRID FEATURES ................................................................ 95 MAIN EQUIPMENT LIST ..............................................................106 GAS TURBINE ............................................................................. 116.1 MAIN FIGURES .........................................................................116.2 AUXILIARIES ...........................................................................,.146.3 MAINTENANCE ACTIVITIES .....................................................186.4 GAS TURBINE CONTROL SYSTEM .........................................187 HEAT RECOVERY STEAM GENERATOR ...................................197.1 WATER - STEAMCYCLE EQUIPMENT .....................................208 STEAM TURBINE ..........................................................................238.1 MAIN FIGURES ..........................................................................238.2 AUXILIARIES ..............................................................................248.3 MAINTENANCE ACTIVITIES .....................................................259 GENERATOR ................................................................................269.1 MAIN FIGURES ..........................................................................269.2 MAIN MAINTENANCE ACTIVITIES: ..........................................2910 GAS COMPRESSION STATION .................................................3011 STEP – UP TRANSFORMER ......................................................3211.1 MAINTENANCE ACTIVITIES ...................................................3412 OTHER MECHANICAL EQUIPMENT .........................................3512.1 AUXILIARY STEAM GENERATOR ..........................................3512.2 STEAM CONDENSER (WATER-TYPE) ...................................3512.3 CONDENSATE SYSTEM .........................................................3612.4 VACUUM SYSTEM ...................................................................3712.5 BY-PASS VALVE ......................................................................3812.6 DEMIWATER PLANT ................................................................3812.7 COOLING SYSTEM ..................................................................3812.8 COMPRESSED AIR SYSTEM ..................................................4012.9 FIRE FIGHTING SYSTEM ........................................................ 4112.9.1 Water system for external areas ............................................ 4112.9.2 Deluge system on HV/MV and MV/MV transformers ............. 4212.9.3 Powder system on gas compressors ..................................... 4312.9.4 CO2 system ........................................................................... 4312.10 CHEMICAL DOSING .............................................................. 4313 OTHER ELECTRICAL EQUIPMENT ........................................... 4413.1 UNIT TRANSFORMERS 11,5/6,3 KV ....................................... 4413.1.1 Maintenance Activities ............................................................ 45

13.2 AUXILIARY TRANSFORMERS 6/0,4 KV .................................. 4513.2.1 Maintenance Activities ............................................................ 4613.3 EMERGENCY TRANSFORMER 15/0,38 KV ............................ 4613.4 DISTRIBUTED CONTROL SYSTEM (DCS) .............................. 4613.5 GENERATOR CIRCUIT BREAKER ........................................... 4713.5.1 Maintenance Activities ............................................................. 4713.6 HV &MVPROTECTION, CONTROL/ PANEL ............................. 4913.7 MVPANEL 6KV ........................................................................... 4913.8 LV PANEL 0.4KV, DC SYSTEM, UPS ........................................ 5013.9 LIGHTING AND EARTHING SYSTEMS ..................................... 5113.10 MEASUREMENT PANELS ....................................................... 5114 ANNEXES ...................................................................................... 52

1 SCOPE OF THE DOCUMENTScope of present document is the supply of technical information about the main figuresof the Power Plant and its main equipment, including operation andmaintenance data, to be handed over to potential purchasers.

2 DEFINITIONS AND ABBREVIATIONSUtilities Partner Means the local Company (paper mill), whose industrial settlement – nearby the subject Power Plant – purchases the steam from the Plant and returns well water, demi water, steam from aux boiler and condensate to the Plant.

3 POWER PLANT GENERAL DESCRIPTIONThe combined cycle power plant is able to produce electric power(exported to the National Grid) and steam (exported to local Partner’s industrialfacilities).

It was first synchronized in October 1997 and entered commercial operation in February1998.

As a single-shaft line, it is mainly composed by:One General Electric MS6001FA gas turbine (Frame 6FA)One Heat Recovery Steam Generator (HRSG) producing steam at two differentpressure levels (80 and 3 bar)One General Electric steam turbine, with steam extractionsOne General Electric generator, connected both to gas turbine and to steam turbinePower plant is now in stand-by and turning operation, last full load operation was inMarch, 8th, 2011.Original design foresees the predispositions to add a second Steam Turbine with its ownGenerator; for this reason, Step Up transformer is designed with three windings.EPC contractor for the original installation was Italian company Turbotecnica, based inFlorence.General layout and single line diagrams are available in Annexes.Additional information about present site conditions:

Figure 1-Single Line Diagram

Figure 2- Power Plant general layout

4 PERFORMANCES AND EMISSIONSNominal power plant total output: 93 MWPower Plant nominal Gross Output: 93 MWGas Turbine nominal power: 70 MwSteam Turbine nominal power: 23 Mw

On 7th June, 2011 a Witnessed Test Run of the combined cycle was performed under the attendance of an independent inspector from ‘no load’ conditions up to ‘base load’ conditions, main parameters have been recorded.

At the base load condition, power of 67.1MW has been recorded for the Gas Turbine; with Steam Turbine connected to the Turbine train, the performance was 78.2MW.Full test report can be found in Annex.

With reference to 15% O2, Power Plant complies with the following limits:NOx local limit value: 50 mg/Nm3CO local limit value: mg/Nm3

4.1 HV GRID FEATURESFollowing table summarizes the main features for present HV grid, for reference only:

Electric Power costumer: ENELRated voltage, frequency: 132kV ; 50Plant is also connected to the Grid via a secondary emergency line, available 363 days/year (2 maintenance days are scheduled with a 15days advance).Electric Power provider: ENELRated voltage, frequency: 15kV ; 50

5 MAIN EQUIPMENT LISTFollowing table summarizes the key data for main equipment:Equipment OEM Model Running hours (Aug 2010)

Gas TurbineOEM: General ElectricModel: Frame 6FA (MS6001FA) Running Hours: 85097

Steam Turbine: OEM: G.E./Nuovo Pignone Model: HNK 50/90-3Running Hours: N/A

GeneratorOEM: General ElectricModel: 7AGRunning Hours: 85097

Gas Compressors (n.2x100%):OEM; Nuovo Pignone (motors: ABB)Models: 2HM/1 560 kWRunning Hours: 37795; 48791(Dec 2010)

Heat Recovery Steam Generator:OEM: Henry Vogt Model: 49 Running Hours: 85097

Step-up transformer 11,5 – 11,5 - 132 kVOEM: ABBModel: 112 MVA + 29 MVA

MV Transformer (A) 11,5 - 6 kVOEM: ABBModel: 8 MVA

MV Transformer (B) 11,5 - 6 kVOEM: ABBModel: 8 MVA

MV/LV Transformer (A)OEM: VENETA TRASFORMATORIModel: 2 MVA

MV/LV Transformer (B)OEM: VENETA TRASFORMATORIModel: 2 MVA

Emergency Transformer 15 – 0,4 KVModel: 1,25 MVA

Auxiliary steam generator and Demi water production plant are owned by the localindustrial partner, hence they are excluded from the sale.

6 GAS TURBINEGas Turbine is a General Electric MS 6001FA (Frame 6FA).

6.1 MAIN FIGURESGas TurbineManufacturer: General Electric / Nuovo PignoneModel: MS 6001FA (Frame 6FA)Serial: 2968281st synchronizing: October 1997Operating Fire Hours: 85097 at August 2010Fuel: Natural gasPower @ base load, ISO conditions: 75.9 MwHeat rate @ base load, ISO conditions: 9760 kJ/kWhSpeed: 5231 rpmControl system: Speedtronic Mark V

Design temperature:Inlet air: 15°CExhaust flow: 600°CStarting device: Generator drivenMounting: Skid base

Compressor section details:CompressorType: AxialNumber of stages: 18Inlet guide vanes: Regulating I.G.V., hydraulically actuated

Turbine section details:TurbineNumber of stages: 3

Figure 3 - Combustor Figure 4 - Fuel nozzles (during 2008 inspection)

Combustion section

Combustion section details:CombustorsNumber of combustion chamber: 6Number of spark-plugs: 2, electrode typeFlame detectors: 4Conventional / DLN: DLN 2NOx reduction systemType: DLN 2Injection stages: 4Inlet gas pressure: 26-29 barValves type: Hydraulically actuatedValves manufacturer: EECC SA Mezzovico (CH)Fuel: Fuel gasType: 26 ÷ 29Pressure: 35 ÷ 100 (no heating devices,

compression heating only)

Figure 5 - External view of the power block enclosures

6.2 AUXILIARIESAir intake system:

Air intakeManufacturer: Donaldson - InsoFlow rate (ISO conditions): 772.000 kg/hPressure loss (filter room): 330 PaAnti-icing: Steam coil fed by LP steam,

activated <7°C. Original design: heated by premixing with hot air from GT compressor (73000kg/h @310°C)

Filtering sectionPrefilter: coalescerHigh efficiency filter class: n. 224 cylindrical + n.224 conical

Self cleaningCompressed air flow: 77 m3/hCompressed air pressure: Min 5,5 – Max 6,7 barStart / stop thresholds: 450 / 750 PaSilencer: YesEvaporative cooler: No

Fogging: NoEntering direction of air into GT compressor: From top

GearboxManufacturer: RENK TAManufacturer: SICMEModel: P200NL4-CNV/VIYear: 1997Number of units: 1 x 100%Type: DC motor driven

Lube oil tank includes heaters to grant a minimum oil temperature; oil cooling is providedby oil – water exchangers (2x100%) with dewatering PALL system, model HNP021-GYF12 .

An additional lube oil tank , 1m3 sized, in installed in high location and acts as anemergency reservoir.

Vapour extraction system is PALL make, 26mm H20 drop, with an additional oil eliminator (installed later).

Rotor cooling system:Rotor cooling

Type: AirCoolers: Water to Air exchangersRegulation: 2 valves, for blades and combustors

Compressor washing system:Compressor washingManufacturer: PROGECOOperation frequencyOnline: NeverOffline: Every 2/3 monthsCleaner: ROCHEM MARINE F1CKEModel: TA73XT

SpeedsGT side: 5500Generator side: 3000Cooling: Oil

Figure 6 – Reducer gearbox – turning gear group

Lube oil systemAn unique system provides oil lubrication to the whole Power Plant (Gas Turbine,Generator, Gear box, Steam Turbine, Clutch).

Lube oil pump (main)

Manufacturer: Aris ChiappaModel: CVTG 100/250Year: 1997Number of units: 1 x 100%Type: AC motor driven (ABB)

Lube oil pump (auxiliary)Manufacturer: Aris ChiappaModel: CVTG 100/315AYear: 1997Number of units: 1 x 100%Type: AC motor driven

Lube oil pump (emergency)Manufacturer: SICMEModel: P200NL4-CNV/VI

Year: 1997Number Of Units: 1 x 100%Type: DC motor driven

Lube oil tank includes heaters to grant a minimum oil temperature; oil cooling is providedby oil – water exchangers (2x100%) with dewatering PALL system, model HNP021 GYF12 .

An additional lube oil tank , 1m3 sized, in installed in high location and acts as anemergency reservoir.

Vapour extraction system is PALL make, 26mmH20 drop, with an additional oil eliminator (installed later).

Rotor cooling system:

Rotor coolingType: AirCoolers: Water to Air exchangersRegulation: 2 valves, for blades and combustors

Compressor washing system:

Compressor washingManufacturer: PROGECOOperation frequencyOnline: NeverOffline: Every 2/3 monthsCleaner: ROCHEM MARINE F1

Tank capacityWater: 3m3Cleaner: n/aCleaning mix (water + cleaner): 1m3

Figure 7 - Fuel gas skid valves Figure 8 - Fuel gas skid panel

Gas turbine is started by the Generator, which acts as a motor during start-up phase.

6.3 MAINTENANCE ACTIVITIESGas Turbine is covered by Long Term Service Agreement (LTSA) by OEM up to 2012.Major Inspection was performed at 48.000 OH , in 2003; next Major Inspection is planned at 96.000 OH.

After a load coupling failure in September 2003, a three months outage was necessary to inspect and replace damaged components of compressor, turbine, gearbox and clutch.

Main maintenance interventions are summarized in the relevant table in Annexes.

6.4 GAS TURBINE CONTROL SYSTEM

Gas turbine control system is GE SPEEDTRONIC™ Mark V , with two (2) operatorstations.

Some features of the system follow:

Triple-redundant microprocessor controllers, two-out-of-three voting

Control of liquid, gas or both fuels in accordance with the requirements of the speed, loadcontrol under part-load conditions

Temperature control under maximum capability conditions or during startup conditions.Sequencing of the auxiliariesFully automated startup, shutdown and cool down

Turbine protection against adverse operating situations and annunciation of abnormalconditions

Operator interface consists of a color graphic monitor, keyboard, cursor positioning device to provide feedback regarding current operating conditions.In the first period, Gas turbine was online monitored by General Electric for severalmonths.

OSM hardware (owner: General Electric) in installed in Control Room and providesremote online monitoring of the fuel gas pressure fluctuations after each start-up, by GEheadquarters.

Mark V Specialist (by G.E.) tunes the settings on the control systems using the parameters set by G.E.

Vibration monitoring system BENTLY NEVADA 3300 controls vibrations on mainequipment.

7 HEAT RECOVERY STEAM GENERATORHeat Recovery Steam Generator is HENRY VOGT make; installed downstream of theexhaust duct of the Gas Turbine, it receives the hot flue gas from the Gas Turbine itself and produces steam at two different pressure levels.

HRSGManufacturer: License: HENRY VOGT (USA)Designer: MIRManufacturer: COMEFSerial: 49Year: 1997Type: Water tubes type horizontal gas flow

natural circulationSectionsHP: Economizer/Evaporator/SuperheaterLP: Economizer/Deareator/Evaporator/Superheater

High Pressure (HP) Steam:Steam pressure: 83 bargSteam temperature: 523°CSteam flow: 106,7 ton/h

Low Pressure (LP) SteamSteam pressure: 3 bargSteam temperature: 191°C

Steam flow: 18,6 ton/h

PostfiringManufacturer: De Jong – CoenFuel: Natural gas (3bar)Fresh air intake: NoSteel Stack: dia 3,5 - h 50m

BMSManufacturer: Hartmann & BraunModel: Contronic S

Figure 9 - Heat recovery steam generator

7.1 WATER - STEAM CYCLE EQUIPMENT

Condensate is pumped by Condensate Extraction Pumps to a 250 m3 storage tank where it is mixed with condensate coming from paper mill (Condensate Extraction pumps data sheet is shown in section “Condensate system”).

From storage tank, condensate is pumped by LP feedwater pumps to HRSG Low Pressure system (LP Economizer, LP Evaporator, LP drum with deareator).

LP Feedwater pumps: P930 A/B/C

Manufacturer: Nuovo PignoneModel: F-4x13 DSTHF/2STGYear: 1996Number of units: 3 x 50%Water flow: 87 m3/hPressure (inlet ; outlet): 0,7 ; 27,1 bar gTemperature: 90°CSpeed: 2980rpm

Electrical motorManufacturer: MarelliAdsorbed power: 119KwFeeder: 380V / 3ph / 50Hz

Steam in LP drum is sent to the LP superheater and then to LP section of the ST.

From the LP drum, bottom side, water is sucted by HP Feedwater Pumps and sent to HP section (HP Economizer, HP Evaporator, HP Superheater). HP Feedwater pumps

Manufacturer: Nuovo PignoneModel: 4x12 MSND/9STYear: 1996Number of units: 2 x 100%Water flow: 163 m3/hPressure (inlet ; outlet): 6,5 ; 122,6 bar gTemperature: 150°CSpeed: 2950rpm

Electrical motorManufacturer: StorchAdsorbed power: 706kWFeeder: 6000v/ 3ph / 50Hz

During winter season, it is often necessary to recirculate water in LP economizer section to overcome low ambient temperatures effect. The purpose is satisfied by EconomizerRecirculation Pumps.

Economizer recirculation pumpsManufacturer: Nuovo PignoneModel: F- 4x13 – DSTHF / 2 STYear: 1997Number of units: 2 x 100%Water flow: 87 m3/hHead: 27,6 barSpeed: 2980 rpm

Electrical motorManufacturer: MarelliModel: A4 315 MC / 2Adsorbed power: 112vKwVoltage lever: 380v

8 STEAM TURBINE

8.1 MAIN FIGURESSteam TurbineManufacturer: General Electric / Nuovo PignoneModel: HNK 50/90-3Power: 23,05 Mw1st synchronizing: 1997Condenser fluid: Water

Weights (approx.)Total: 85000 kgRotor: 10000kgMax for maintenance: 41000kgSkid: 16000 kgSpeed [rpm]: 3000

Inlet Steam ConditionsPressure (HP/LP): 82 / 2.2 [bar a]Temperature (HP/LP): 515 / 191 [°C]Condensing pressure: 0,06 bar

Figure 10-Steam turbine Nuovo Pignone NK-HNK

8.2 AUXILIARIESClutch allows connection / disconnection between Gas Turbine and Steam Turbine.Clutch

Manufacturer: SSS GearsModel: 200FT

Turning Gear System:Turning gear Manufacturer: NUOVO PIGNONEMotor Type: Electrohydraulic + manualMax torque (at 50kg/cm2): 575 kg

Figure 11 - Steam Turbine main valve

8.3 MAINTENANCE ACTIVITIESIn August – October 2009 a Major Inspection was performed by Ansaldo EGS, togetherwith some additional repairs and replacements. Report is available in Annexes.

9 GENERATOR

9.1 MAIN FIGURESGeneratorManufacturer: General ElectricModel: 7AGDate: 1997Power output: 110 MVAOperating hours: 85.097Cooling system: Air cooled by air/water coolers

Speed: 3.000 rpm – 2 polesFrequency: 50HzInsulation class: FPower factor: 0.85Rated Voltage: 11500vRated Current: 5522 AmpsTotal Mas: 150.000kg

Excitation systemManufacturer: General ElectricModel: EX2000Type: StaticRated Power: 293KwRated voltage levels:Output: 305v DCInput: 360v 3-phases

Rated current:Output: 962A DCInput: 699A 3-phasesRated frequency 60Hz

Static starterManufacturer: General ElectricModel: DIRECTO-MATIC 2000Type: StaticRated Power: 2075KwRated output voltage: 4160vRated output current: 320AInstallation: Indoor, inside enclosure

No jacking pumps for rotor lifting.

Generator is provided with:1 control panel 1PG-1 with synchronizing system (ABB Synchrotac 4) and electricmeasurements (ABB Muratori)1 protection panel 1PG-2 (ABB Muratori)1 excitation panel (GE EX2000)1 static starter panel (GE DIRECTO-MATIC 2000)

Figure 12- General Capability Diagram

9.2 MAIN MAINTENANCE ACTIVITIES:

A generator inspection, consisting on visual inspection to core, stator and winding, was

performed In August 2007.

On 19/05/2008 a rotor earth fault occurred, requiring a three month-long recovery activity during which rotor was completely rewound

A deep inspection of the stator windings and frame was performed and the followingmaintenance activities were carried out:

Stator winding cleaning;Measurement of stator winding resistance;Measurement of polarization index;Insulating resistance test;DC windings leakage test;Tan delta test and partial discharge test;Bearing inspection;Air/water heat exchanger rust removal;Gaskets change.

In September 2009 the last inspection was performed, including: visual and boroscopeinspection, polarization index, insulating resistance test and stator winding resistance.

Figure 13- Generator Polarization Index

Figure 14 - generator polarization index

10 GAS COMPRESSION STATIONNatural gas is supplied by national network (SNAM Rete Gas) via underground network.

Gas compressorsManufacturer: Nuovo Pignone

Model: 2HM/1Number of units: 2 (1 duty, 1 stand-by)Type: ReciprocatingFlow rate: 22.750 Nm3/h

Pressure, TemperatureSuction: 16 , 20 bar g, °CDelivery: 29 , 65 bar g, °CMechanical power: 500KwRotating speed: 740rpmRegulation steps: -50-75-100% +continuous regulation via

bypass valve

Electric motorManufacturer: ABBElectric data: 3 ph – 8 poles – 50 Hz – 6300VAdsorbed power: 560KwCooling: IC411

Cooling system: Water 35.5m3/h]Lubrication system: Upgraded to oil-free

Gas compressors went under revision in 2010.

Figure 14 - Gas compressor

It is available a gas chromatograph, DANIEL make, now out of service (to be refurbished).

11 STEP – UP TRANSFORMERGenerator is connected, via an air-insulated bus duct, to a three windings Step-Uptransformer, ABB make.

Third winding (MV2) is available for a future expansion, to be connected to the generatorof a second steam turbine.

Step-up transformer: 1ETMManufacturer: ABBYear: 1996Serial: 5I6110Number of units” 1Type (indoor/outdoor): OutdoorWindings: 3 phases (1 primary HV and 2 secondary MV)Frequency: 50HZVolt levels (HV/MV1/MV2): 139.8±8x1.25% / 11,5 /11,5[kV]Rating Power (HV/MV/MV2): 141.5 / 112 / 29.5 [MVA]Current (HV/MV1/MV2): 584.4 / 5623 / 1481[A]Connection groups: YN-d11-d11Insulation levels : IA 750 FI 325 [kV]

IA 125 FI 50325 [kV]IA 125 FI 50325 [kV]

Cooling type: ONAFTap-changer: Yes, on-loadShort circuit v at 75°C HV/LV1 [%]: n/aShort circuit v at 75°C HV/LV2 [%] n/aWeight (oil; with drawable part; total: 48000; 112000; 196000kg

Figure 15 - Step Up transformer

Step-up transformer is provided with the following main protections:Max. currentDifferential protectionResidual overvoltage protectionRestricted earth fault protectionTank Buchholtz relayOLTC Buchholtz relayTank Pressure relief relayMin. oil transformer tank level alarmMin. oil transformer OLTC level alarmOil temperature relay

11.1 MAINTENANCE ACTIVITIESIn August 2009 the tap changer was checked by ABB, in detail a visual inspection wasperformed, the transmission system was lubricated and insulating oil replaced.

In August 2009 a visual inspection was performed by ABB, some electrical test and aspecific one called “Frequency Response Analysis” on the windings were performed. Inthe same year ABB removed some leak by re-welding.

On August 2010 oil selective depolarization was performed by Sea Marconi specialists.

On 24/03/2011 oil inspection was latest performed by Sea Marconi specialists.

12 OTHER MECHANICAL EQUIPMENT

12.1 AUXILIARY STEAM GENERATORAuxiliary steam generator is owned by the local Utility Partner and is not located inside the Power Plant boundary; it is not included in the present sale. Starting procedure does not require auxiliary steam generator.

12.2 STEAM CONDENSER (WATER-TYPE)Downside the steam turbine, steam is condensed by a water-cooled steam condenser.

Steam condenser: E 500Type: Surface condenserManufacturer: Wellman Graham Ltd (GB)Model” E-500

Design dataCode: ASME VII div. 1 (1994)Temp (tubes; for shell): 80 ; 200°C

Water tubesNumber: 5864Material: Stainless steel ASME A249 TP 304L

Condensing system is provided with a vacuum system.

Figure 16 - Steam condenser Figure 17 - Condensate extraction pumps

12.3 CONDENSATE SYSTEMAfter Steam Turbine, exhaust steam and condensate from Utility Partner are sent toCondenser, from which it is drained by the Condensate Extraction pumps and forwarded to HRSG.

On the suction of the CEPs, an idrazine injection is provided.

Condensate Extraction pumps: P500 A/BManufacturer: NUOVO PIGNONEModel: 6” – VDA / 3STYear: 1996Number of units: 2 x 100%Number of stages: 3Flow rate: 161 m3/hHead: 6,7barNPSH: 0,1barSpeed: 1480rpm

Electric motorManufacturer: MarelliModel: A4C 280 S437Adsorbed / rated power: 3 ; 55KsVoltage level: 380v

12.4 VACUUM SYSTEM

Vacuum level in the condenser is granted by a dedicated redundant system, ejectors-type.

Main vacuum system: EJ-501B / EJ502BType: Ejectors-typeManufacturer: AB PROGETTINumber of stages: 2, with intercooler and aftercoolerSteam for ejectorsSupply: From HRSGPressure (min ; max); 3,5 ; 4Bar a Temperature: 190°C

EjectorsNumber of ejectors, first stage: 2 x 100%Number of ejectors, second stage: 2 x 100%Cond. pressure (min; max): 0,034 to 0,4 Bara aCondensate temp. (min; max): 22 to 72°CExtracted flow (air; steam): 15,5 ; 34 kg/h

Intercooler condensing fluidNumber: 2 (inter- & after-cooler)Fluid: WaterDesign flow: 100.000 Kg//h

During start-up, when steam from HRSG is not available, vacuum system is on stand-byand vacuum is granted by a separate system, using liquid-ring pump.

Start-up vacuum system: P502A/BType: Liquid-ring pumpManufacturer: ROBUSCHIModel of pumps: RPA-40Number of pumps: 2Pressure: 0,300 barElectric motor size: 45Kw

12.5 BY-PASS VALVEBy-pass valvesManufacturer: BTGNumber: 1 for HP, 1 for LP

12.6 DEMI WATER PLANT

Demi water for the thermal cycle reintegration is supplied by the local Utility Partner, soDemi Water Production Plant is not included in the Power Plant assets.

12.7 COOLING SYSTEM

Heat from Power Plant main equipment (GT, gas compressors, HRSG auxiliaries, …) is

removed by a water cooling system and finally dissipated by Evaporative towers, whichdischarge the water into a collection pit, from which it is then drained and sent back tousers.

Circuit is fed by well / raw water, filtered, softened and injected with corrosion inhibitorsand biocides.

Data sheets of main equipment follow:

Evaporative towers: EH900/901/902Manufacturer: HAMON CIFAType: Wet dry, forced draft, counterflowNumber of units (cells): 3 x 50%Design Air Temperature (Wet / Dry): 22,8 / 35,0°CWater temperature (Cold / Hot): 27,0 / 35,2°CFlow rate (design, max): 5450 m3/h

Electrical motorNumber, each unit: 1x100%Power: 110Lw

Condenser cooling water pumps: P900 A/B/CManufacturer: Nuovo PignoneModel: 20” H VSA/1STYear: 1996Number of units: 3 x 50%Flow rate: 2500 m3/hHead: 2,6 barSpeed: 985rpmAdsorbed power: 215Kw

Circulating cooling water pumps for aux; P901 A/BNumber of units: 2 x 100%Design flow rate: 430 m3/h] (each pump)Head: 5.1bar

Figure 18 - Condenser cooling water pumps

12.8 COMPRESSED AIR SYSTEM

Compression station provides compressed air to service air users and instrumental air users.

Air compressors: K 870 A/BManufacturer: ATLAS COPCOModel: ZT 75Number of units: 2 x 100%Type: Screw – double stageMotor speed: 2970rpmAdsorbed power: 81,7KwFlow rate: 600 m3/hPressure: 5 - 8 bargTemperature: 28°CCooling system: Air

Service air and Fire fighting lines are taken directly from the accumulator (3 m3 / 12 bar).

Instrument air is filtered, dried (double-column type), final filtered and accumulated in asecond vessel (3 m3 / 12 bar).

12.9 FIRE FIGHTING SYSTEM

Fire fighting system provides protection to the CCPP , its equipment and personnel in case of fire event.

12.9.1 Water system for external areas

An underground water system serves hydrants and hoses all around the plant.Pressurization of the water network is granted by an electric jockey pump; in case of fireevent, with the activation of protection devices, main electric pump is called to start.

A diesel pump acts as a backup in case of main pump failure.

Main FF electric pump: P886Manufacturer: NUOVO PIGNONEModel: 2000X500DVENumber of units: 1 x 100%Flow rate: 300 m3/hHead: 7 bar gNPSHR: 0,24 bar gDesign temperature: 35°C

Electric motorManufacturer: MarelliModel: B4C-315 MA479,1Power: 79.1Kw

Jockey FF electric pump: P887Manufacturer: NUOVO PIGNONEModel: C-2 X 11-VPNumber of units: 1 x 100%Flow rate: 15 m3/hHead: 7,7 bar gNPSHR: 0,55 bar gDesign temperature: 30°CElectric motor

Manufacturer: MarelliModel: A4C-160 MB2Power: 8,7Kw

Backup FF diesel pump: P885Manufacturer: NUOVO PIGNONEModel: 2000X500DVENumber of units: 1 x 100%Flow rate: 300 m3/hHead: 7 bar gNPSHR: 0,55 bar gDesign temperature: 35°C

Diesel motor

Manufacturer: DEUTZModel: BF6M 1013EType: 4 strokes, 6 cylinders, direct injectionCapacity: 7146 cm3

12.9.2 Deluge system on HV/MV and MV/MV transformers

As per original installation (by SANCO), n.1 HV/MV electrical transformer and n.2MV/MV electrical transformers are protected by

Fire detection system (cable detector)Water deluge system (dry type)Additional similar systems have been installed later (by CIODUE SUD) also on theMV/LV transformers.

12.9.3 Powder system on gas compressors

Two independent fire detection (cable detectors) and powder systems provide fireprotection and extinguishing on the gas compressors.

12.9.4 CO2 system

Smoke detection system and automatic CO2 extinguishing system insteam turbine and auxiliaries enclosure

Gas turbine enclosure - bearing n.2

Electrical & control room building, rooms and under floor for MV room, LV room, controlroom, technical room

Smoke detection system in warehouse.

12.10 CHEMICAL DOSINGA chemical dosing system provides the injections of chemicals to cooling water and steam circuits

13 OTHER ELECTRICAL EQUIPMENT

Figure 19 - Unit transformer Generator-side Figure 20 - Unit transformer Step-up

transformer-side

13.1 UNIT TRANSFORMERS 11,5/6,3 KV

Unit transformers: 1ETU-2ETUManufacturer: ABBNumber of units: 2 (1 upstream GCB 1 downstream GCB)Rated voltage; 11,5±5% / 6,3KvRating: 8 MVACooling: ONANTap-changer : Yes, off-loadConnection groups: Dyn11Short circuit voltage at 75°C: 4,9%Weight (oil; withdrawable part; total): 2950; 9100; 16500kg

13.1.1 Maintenance ActivitiesIn August 2009 was performed by ABB visual inspection and some electrical test.On 24/03/2011 oil inspection was latest performed by Sea Marconi specialists.

13.2 AUXILIARY TRANSFORMERS 6/0,4KVAuxiliary transformer: 1ETD – 2ETDManufacturer: VENETA

TRASFORMATORINumber of units: 2Voltage levels: 6±2x2.5% / 0,4KvRating: 2MVA

Cooling: ONANTap-changer: Yes, off-loadConnection groups: Dyn11Short circuit voltage: 6,47%Weight (oil; withdrawable part; total): 930; 3100; 4800kg

Figure 21 - Auxiliary MV/LV transformer

13.2.1 Maintenance Activities

In August 2009 a visual inspection and some electrical test were performed by ABB.On 24/03/2011 oil inspection was latest performed by Sea Marconi specialists.

13.3 EMERGENCY TRANSFORMER 15/0,38KV

Emergency transformerNumber of units: 1Voltage levels 15 / 0,380Kv

13.4 DISTRIBUTED CONTROL SYSTEM (DCS)

Distributed Control System (DCS), manufactured by HARTMANN & BRAUN, collectsinformation from dedicated control systems for main equipment and allows an overalloverview of the main data of the power plant as well as the possibility to control andmanage its operation.

Main dedicate control systems:Gas Turbine control system (GE, Mark V)Steam Turbine and Generator control systemBoiler Monitoring System (HARTMANN & BRAUN)Continuous Emission control system (HARTMANN & BRAUN)

Figure 22 - Control system monitors

13.5 GENERATOR CIRCUIT BREAKERGenerator (MV) Circuit breakerManufacturer: SIEMENSModel: 8FG10Year: 1996Number of units: 1Type: VacuumRated current, voltage: 6300A ; 17,5Aux voltage for operating device: 110 dc V

13.5.1 Maintenance ActivitiesIn August 2009 a revision to the earthing switch, a minor inspection to the components and a synchronization test on the tree poles of the breaker during opening and closingoperations was performed by Siemens.

Figure 23 - Generator Circuit breaker

Figure 24 - Unit transformers, GCB, bus duct

13.6 HV & MVPROTECTION, CONTROL ANDMEASUREMENT PANELControl & Protection panelManufacturer: ABB MuratoriProtection devices manufacturer : ABBProtection devices type: Some “REG” type

Figure 25 - Electric Control & Protection panels

1PT-1 Transformer Measurement and Control Panel1PT-2 Transformer Protection Panel (HV-MV)1PG-1 Generator Measurement, Control and Synchronizing Panel1PG-2 Generator Protection Panel (MV)PH Change Over Panel

13.7 MVPANEL 6KV

Figure 26 - MV switchboard Figure 27 - LV switchboard

MV Panel is provided with 2 separate sections connected by a bus tie and automaticchange-over.Manufacturer: ABB.

13.8 LV PANEL 0.4KV, DC SYSTEM, UPS

LV Panel is provided with 2 separate bus bars, fed by the two auxiliary transformers,connected by a bus tie with automatic change-over device.

Manufacturer: General Electric

UPS system is manufactured by BORRI and refurbished in 2010.Batteries have been replaced on December 2010.

13.9 LIGHTING AND EARTHING SYSTEMSExternal lighting system is made up by:Fluorescent lamps installed on the buildings;Lighting columns around the motorized roads.

The earthing system of the power station is connected with the one of Steam Client’sfacilities. Maximum current of earth fault is 16000A; step max voltage permitted is 639Vand the contact max permitted voltage is 213V.

13.10 MEASUREMENT PANELS

One panel for gas fiscal measuresOne panel for electrical fiscal measures.

14 ANNEXESAnnex 01 - Witnessed Test Run reportAnnex 02 – Power Plant LayoutsAnnex 03 – Single line diagramsAnnex 04 – Balance of Plant P&IDs

Annex 05 – Gas Turbine maintenance reports (2004-2010)Annex 06 – Steam Turbine maintenance reportsAnnex 07 – Generator data and maintenance reports (2007-2009)Annex 08 – Transformers maintenance reportsAnnex 09 – Generator Circuit Breaker maintenance reportsAnnex 10 – Operation data (daily operation data 2010; monthly gas consumption andenergy production 1999-2006; design H&M balance; Steam Turbine design operatingconditions)