FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PLANT NO. 1 CENTRAL GENERATION UPS SYSTEM REPLACEMENT
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Purchase Order Contract for the purchase and installation of a replacement uninterruptible power supply system for Plant No. 1 Central Generation, using the U.S. Communities Master Agreement No. EV2370, to Graybar Electric, for an amount not to exceed $102,325, plus applicable sales tax and freight; and
B. Approve a contingency of $20,465 (20%).
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BACKGROUND
The Orange County Sanitation District's (Sanitation District) Reclamation Plant No. 1 is powered by Southern California Edison and the Plant No. 1 Central Generation (CenGen) operating in parallel. The control and computer systems that manage the engines, power transfer systems, and process systems at CenGen are powered with an uninterrupted power supply (UPS) to prevent short-duration power interruption that cause system instability. Power system instability causes plant wide equipment shutdowns.
RELEVANT STANDARDS
* Protect Orange County Sanitation District assets
* 24/7/365 treatment plant reliability
* Maintain a proactive asset management program
PROBLEM
The existing CenGen UPS system was installed under Project No. J-19-1 in 1993. This UPS system is at the end of its useful life and prone to battery failures. System components are obsolete, so replacement parts are difficult to locate and procure. The system may be down for extended periods when failures occur while parts are located and procured.
PROPOSED SOLUTION
Staff recommends replacing the existing CenGen UPS and batteries with a new turnkey solution from U.S. Communities/Graybar. The new UPS system will reduce operational risk and improve maintainability of the system.
TIMING CONCERNS
The Headworks Rehabilitation and Expansion Project No. P1-105 will replace t...
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