Grayson Power Plant
Unit 9 Chiller Overhaul and a Five-Year
Service Agreement with Trane U.S. Inc.
October 22, 2024
Scott K. Mellon, Assistant General Manager – Power Management Glendale Water & Power
Item 8.c
Unit 9 Chiller
2 • Trane CenTerVac water-cooled duplex
centrifugal chiller
• Over 20 years old
• Maximizes power generation during
high ambient temperatures
• Serviced by various non-OEM vendors
• Need for Sole-Source
Representative image of a simplex (single compressor) Trane CenTraVac chiller
Current Issues with the Unit 9 Chiller
3 • Chiller out-of-service
o 13 MW derate during high ambient
temperatures
• Circuit 1 compressor
o Very dark oil and high acid content
• Circuit 2 compressor
o High vibration and erratic amperage
fluctuations
• Refrigerant monitor (leak detector) not
working
Photos of the circuit 1 very dark oil and oil sample analysis results Photo of circuit 2 testing showing erratic amperage fluctuations Recommendation
4 • Overhaul the chiller, add a refrigerant clean-up kit, and replace the refrigerant monitor o Trane CenTraVac R’newal Service Program
o Trane U.S. Inc. is the only authorized vendor
• Dispense with competitive bidding and authorize:
o Service Agreement with Trane U.S. Inc.
o Overhaul work, and 5 years of preventative maintenance and service o Not to exceed contract amount of $930,790, which includes a 25% contingency #MyGlendale
Questions?