FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PLANT NO. 2 MAIN SEWAGE PUMPS, VARIABLE FREQUENCY DRIVE, 10 YEAR PREVENTATIVE MAINTENANCE
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GENERAL MANAGER'S RECOMMENDATION
RECOMMENDATION: Recommend to the Board of Directors to:
recommendation
A. Approve Sole Source Purchase Order Contract with OneSource Distributors for performing the 10-year manufacturer recommended Preventative Maintenance (PM) on all seven of Plant No. 2 Main Sewage Pump Variable Frequency Drives for an amount not to exceed $438,751, which includes the purchase of the full scope of supply, freight, and taxes; and
B. Approve a contingency of $43,876 (10%).
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BACKGROUND
The Orange County Sanitation District (Sanitation District) has seven Main Sewage Pumps (MSP) at Plant No. 2 Headworks to pump all influent wastewater entering the plant for further treatment. These MSPs are each driven by an Allen Bradley PowerFlex 7000 Medium Voltage Variable Frequency Drive (VFD) for speed control. The VFDs were installed during the construction of P2-66 Headworks Improvements at Plant No. 2, which lasted from 2005 to 2013.
RELEVANT STANDARDS
* Maintain a proactive asset management program
* Meet volume and water quality needs for the GWRS
PROBLEM
The drives have reached their 10-year asset life cycle in which major preventative maintenance is critical to internal components and to maintain reliability per the manufacture's recommendation. Critical electronic and electrolytic components have reached their end of life cycle. Considering the number of years that have passed since the VFDs were manufactured and process criticality, it is essential that the electronics be maintained in optimum condition to ensure reliability, rather than waiting for failures to occur.
Additionally, Project No. P2-122, Headworks Modification, is designed to segregate reclaimable and non-reclaimable flows to support the Groundw...
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