FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PURCHASE OF INVENTORY CENTRIFUGE REPLACEMENT PARTS
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Sole Source Purchase Order to GEA Mechanical Equipment US Inc. for the Purchase and Replenishment of Inventory Replacement Parts for Thickening and Dewatering Centrifuges, for the period beginning December 1, 2021 through November 30, 2022, to maintain equipment warranty, for a total amount not to exceed $1,116,000; and
B. Approve a contingency of $111,600 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) operates six centrifuge process trains at Plant No. 1, including three GEA-Westfalia Separator Co-Thickening Centrifuges and three GEA-Westfalia Dewatering Centrifuges. The Co-Thickening Centrifuges thicken the sludge feed to the digestion process by increasing solids density. As a result, greater amounts of solids are treated within each digester resulting in highly efficient use of digesters. Dewatering centrifuges remove water from biosolids to make the material suitable for truck transportation, resulting in fewer truckloads of biosolids being hauled offsite. The sludge co-thickening and biosolids dewatering processes are central to the energy recovery and biosolids recycling programs and for complying with OC San operating permits.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
* Maintain a proactive asset management program
* Operate and maintain facilities to minimize impacts on surrounding communities, including odor, noise, and lighting
PROBLEM
The six centrifuge machines require periodic overhaul to replace wear and tear parts. Staff has identified critical Original Equipment Manufacturer (OEM) spare parts that are necessary for these periodic overhauls. The spare parts are fabricated on an as-needed basis and have long manufacturing lead times ...
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