FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PLANT NO. 2 EFFLUENT PUMP STATION ANNEX, VARIABLE FREQUENCY DRIVE MODERNIZATION, AND MANUFACTURER SERVICE AGREEMENT
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve Sole Source Purchase Order to the Original Equipment Manufacturer, Siemens Industry, Inc., to modernize three Effluent Pump Station Annex (EPSA) Variable Frequency Drives (VFDs) for a fixed amount not to exceed $368,879, plus applicable tax and shipping;
B. Approve Sole Source Purchase Order for SIEPRO(r) Technical Service Agreement with Siemens Industry, Inc. to perform annual preventative maintenance, for a three-year period, for an amount not to exceed $68,805, plus applicable tax and shipping; and
C. Approve contingency funds of 20% for each contract, for a combined total not to exceed $87,537.
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BACKGROUND
The Orange County Sanitation District (Sanitation District) operates three 3,000 horsepower EPSA pumps at Plant No. 2, each rated for 120 million gallons per day (mgd), designed to pump secondary effluent through the ocean outfall system to the Pacific Ocean. These pumps are driven by a Siemens Sinamics Perfect Harmony Medium Voltage VFD with the NXGI digital control system. They were installed in 2008 through Project No. J-77, Effluent Pump Station Annex, that replaced Foster Booster Pump Station.
RELEVANT STANDARDS
* Maintain a proactive asset management program
* Meet volume and water quality needs for the GWRS
* 24/7/365 treatment plant reliability
PROBLEM
The manufacturer has announced the obsolescence of critical components within the NXGI digital control system of the VFD. Should any of the obsolete components fail, replacement parts are no longer available from the manufacturer which could result in considerable downtime. In addition, the drives are halfway through their anticipated life cycle. An inc...
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