January 11, 2022
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Item No. 22-1041
City Council
Item #6: Cianer~ ~en~rating
Station
RTC 22-1041
Jan 11, 2022
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Gianera Power Plant -- -- -- =J
Constructed in ig86
4g,5 IVI`vV Power Flanr
° Two General Electric Frame 5 Gas Turbines
° Pealcer Plant —Each turbine runs
approximately 250-30o hours a year
° Very significant asset to SVP and the entire
area — needed to meet electric load
° Local facility —not affected by transmission
capacity
Provides positive financial benefit
M ust be in place during the hot months to
ensure system reliaUility
Unit 7 Rotor Installation
Background -~~ --
U Tllt 2
• Issues with the generator and accessory gearbox —significant • December i6, 2020 -Resolution authorizing emergency repairs not to exceed $i.o million
• January i2, zo2i -Increased emergency authorization to $2.5 million after discovery of more critical issues
• Unit z returned to service March i2, 2o2i
Unit 1
Several conditions were identified during routine maintenance — Cracked blades in the compressor section that required repair/replacement
— A failed oil seal on a bearing that required replacement — Severely cracked combustion liners that required replacement — Disintegrating Turbine shroud blocks.
• May 4, 2o2i - Resolution to increase authorization to $io million to complete major overhaul
• Unit i returned to service September i4, 2o2i
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Planned Maintenance Outage
Planned Maintenance Outage for Unit 2 (November 2021)
identified significant damage rendering Unit unserviceable (unaUle to run)
• Major Overhaul for Unit 2 planned for spring 2o2z
• Identified repairs required to return to service:
— Damaged combustion and turbine components
— Damaged fuel nozales and combustion liners
— Eroded stage i shroud blocks, nozzles and turbine blades; — Loose and missing components used to secure rotating parts; and
— Liberation of missing parts has impacted turbine blades downstream
Separate from previous repairs
• Add $2.o million to previous authorization
• Complete major overhaul and consider purchase of spare rotor • The spare rotor would be a significant benefit for reliability f"~ '~,,~ SILICON
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Compressor Rotor Exposed for /nspectJon
Rotor As-Found. Forward Casing Removed
Long Term Maintenance Approach
Staff is proceeding with proactive maintenance for
SVP facilities
Master Agreements are a significant part of the
approach
— Gas turbines at DVR
— Scaffolding
— HVAC
— Commission testing and electrical maintenance
— Mechanical contractor (boiler and pressure code and
non-code welding)
— Gas pipeline maintenance and repair
Proceeding with RFP for Master Agreements for
Gianera Turbines
— Will be released in the next month
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Recommendation
1. Adopt a Resolution authorizing the City Manager to negotiate, award and execute agreements, amendments, purchase orders, and change orders with various vendors as required to complete emergency repairs, corrective and preventative maintenance including the purchase of a spare rotor at the Gianera Generating Station increasing previous authorization to an aggregate amount not-to-exceed $12,000,000 and directing staff to provide Council with a report on contracts awarded and work performed once the repairs have been completed; and
2. Approve the following FY 2021/22 budget amendments:
A. In the Electric Utility Capital Fund, recognize a transfer of $6,700,000 from the Electric Utility Operating Fund, and increase the Major Engine Overhaul and Repair capital project by $6,700,000 (five affirmative Council votes required to appropriate additional revenue).
B. In the Electric Utility Operating Fund, increase the transfer to the Electric Utility Capital Fund by $6,700,000 and reduce the unrestricted ending fund balance by $6,700,000 (five affirmative Council votes required for the use of unused balances). s
Compressorinfet/Combustion Can Disassembly
City Council
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Item #6: Gianera Generating
Station
RTC 22-1041
11, 2022