Technical Field Advisor to provide owner representation for the outage as described below.

- - Work in parallel with the contractor lead to maintain clear communication with HPU.
- - Provide technical review/witness of critical data points and inspections.
- - Provide daily reports of outage progress/issues.
- - Provide a final report at outage completion.
- Plant Information:
- Saavi, La Rosita 1 Steam Turbine
- Baja California/Mexicali, Mexico
- Unit Information:
- Alstom 292MW ZZ3 o SNGM01171
- GEN Alstom 60WT21H-102 hydrogen cooled. Proposed Schedule:

• 08 JAN 27 – 19 FEB 27 Work Scope: 1. Turbine

1. Disassembly of lagging, casings, shells, blades, vanes, etc.
2. Inspection and NDT of turbine casing, rotor, blades, diaphragms, guide vanes, bearings,
3. coupling and sealing on turbine. Ensure all opening and closing measurements are taken and
4. recorded properly.
5. Blast clean turbine rotors, visually inspect, record conditions, mag particle NDE, low speed rotor
6. balance, reinstall rotors, perform rotor alignment checks and record rotor clearances
7. Inspection and NDT of inlet steam valves, extraction valves, Non-Return Valves
8. Disassemble steam side for inspection
9. Visually inspect disc, seat and strainer (NDE seal weld)
10. Perform contact check on seats and discs
11. Record clearance and run out of stem
12. Clean stems and bushings and record clearances; reassemble
13. Visually inspect disc, seat and strainer (NDE seal weld)
14. Inspection of valves, actuators, strainers for gland- and leak-off system
15. inspection of valves, pumps, motors, filters, coolers, servomotors, for lube and hydraulic oil
16. system.
17. Inspection of heat exchangers and condensers in turbine auxiliary system
18. Reassembly
19. Supply and install all STG Soft-parts

2. Turbine Controls

1. Steam Valves Hydraulic Actuators
2. External, visual inspection of operating actuators
3. Replace rod seals and wipers if necessary
4. Inspect and change servo strainers
5. Hydraulic Pumping System
6. (Owner will drain and refill tank.)
7. Inspect and charge accumulators.
8. Check pump operations and motor alignment.
9. Clean compensators.
10. Check and adjust relief valves as required.
11. Change filters, clean screens, reset indicators.
12. Clean and leak check EHC coolers
13. Inspect air dryer, recharge if necessary.
14. Turbine Control Components

i. Visually inspect linkage and adjust.
1. Check and adjust oil trip nozzle.
2. Clean and set gap on speed pickups.
3. Clean and inspect thrust bearing wear detector.
4. Stroke and check calibration of turbine stop and control valves.



(In conjunction with customer I & C)
5. Inspect and clean low bearing pressure trip relay.

d. Supply and install all STG Soft-parts
1. Lube Oil System
2. Owner will drain and refill oil tank
3. Clean and inspect oil tank
4. Main oil pump: Disassemble, clean, inspect, record clearances and conditions and reassemble
5. Remove cooler heads, clean tube sheets and tubes with brushes, inspect and reassemble
6. Auxiliary oil pumps: Disassemble pumps, clean, visually inspect, record clearance and conditions
7. and reassemble (motor inspection not included)
8. Supply and install all STG Soft-parts
9. Turning Gear
10. Examine gears for wear and condition, clean and check operation (motor inspection not included)
11. Supply and install all STG Soft-parts
12. Steam Seal System (Responsibility of owner)

a. TFA will provide technical support for the following:
1. Steam Seal Regulator Valves
2. Disassemble and visually inspect pilot steam side of valve, piston and cylinder
3. Disassemble bellows and pivot rod and inspect
4. Disassemble feed and dump valves and inspect
5. Reassemble and check adjust as required
6. Spray Chamber (Hood spray)
7. Disassemble, clean and inspect inlet water nozzle and strainer
8. Adjust butterfly valves (customer scope)
9. Gland Exhauster
10. Disassemble blower, clean, inspect, record clearances and conditions and reassemble (motor inspection not included)
11. Remove gland condenser head
12. Clean tubes by wire brush
13. Supply and install of all steam seal system parts
14. Turbine Supervisory Instrumentation

a. Visually inspect and check calibration and functionality calibrate devices. 9. Pre—Start And Operational Checks a. Startup support will include 24 hours of support on two shifts for 24 hours after the release of

LOTO.

10. Steam Turbine Generator Major Inspection (Hydrogen Cooled Generator)

a. Pre—shutdown Checks

1. The following Will be checked and recorded prior to shut down (TO be performed by
2. CSM if additional Contractor personnel is not on site):
3. Visually check insulated bearings.
4. Recurring problems and discrepancies review
5. Present annunciator drops
6. Operating data
7. Review active customer information letters

vii. Test the reverse power relay trip function

Options:

viii.



Coast down measurement according to current test procedure

1. Mobilize
2. Marshal tools and equipment adjacent to the unit.
3. Establish work crews.
4. Prepare site for work.
5. Conduct site safety meeting.
6. Remove Lagging
7. Upper end shield lagging
8. Upper cooler dome lagging
9. Disassemble Generator
10. Disassemble journal bearings, visually inspect, record clearances and condition,
11. including ball seat contact and pinch checks.
12. Disassemble oil deflectors and hydrogen seals.
13. Disassemble end shield piping.
14. Disassemble/remove collector brush holder rigging.
15. Remove end shields and generator field.
16. Remove stator cooler heads.
17. Inspection
18. All results will be recorded on standard inspection forms.
19. Visually Inspect/Clean the following:
20. Bearings
21. Oil deflectors
22. Hydrogen seals
23. Hydrogen Coolers (brush cleaning of inside of the tubes only)
24. Generator field
25. Stator cooling air seal
26. Air chamber seals inspection
27. End winding support & insulation
28. Phase rings, leads and overhang insulation
29. Generator Housing
30. Tangential spacers
31. Brush Bridge Insulation resistances

Note: Any repairs or replacement of the components above will be performed as Additional f. Assemble Generator
1. Install stator cooler heads.
2. Generator field
3. bearings
4. Oil deflectors
5. End shields
6. Collector brush rigging
7. Supply and install all STG Soft-parts
8. Assemble Lagging

1. Upper end shield lagging
- Stator cooler dome lagging and Operational Checks g. Pre—Start i. Check slow roll operation.

ii. Record start-up and operational data.
1. Demobilize
2. Clean up the work area to a condition similar to that in which it was found.
3. Remove tools.
4. Report

i. A final report of the inspection, including; conditions found, work performed, inspection data, clearance data, operational data, recommendations, and spare and renewal program parts, will be prepared and submitted in accordance with the Appendix 9.
- Machine #4 bearing journal to restore the surface finish. o ProvidethisasanoptionalT&Mestimate.;
- Notes:
- Unless otherwise noted insulation, scaffold, office space, break rooms and ablution facilities will be provided by the client.
- A Quality Plan with identified witness and/or hold points must be submitted for approval 30 days previous to the outage start by PSG.
- A detailed outage scheduled shall be provided by PSG 30 days previous to the outage.
- Final written outage report will be submitted to PSM within 30 days of outage completion.

📌 Steam Turbine Technical Field Advisor (Mexicali)
🏢 ON GRID INFRASTRUCTURE SERVICES
📍 Mexicali