FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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THICKENING AND DEWATERING CENTRIFUGE GEAR UNIT REPLACEMENTS AND SERVICE
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a General Services Contract to GEA Mechanical Equipment US, Inc. for the thickening and dewatering centrifuge gear unit replacements and service, for a total amount not to exceed $2,912,178 including freight and taxes; and
B. Approve a contingency of $582,436 (20%).
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BACKGROUND
The Orange County Sanitation District (OC San) operates three GEA-Westfalia Separator Thickening Centrifuges and three GEA-Westfalia Dewatering Centrifuges at Plant No. 1. Thickening centrifuges thicken the sludge feed for the digestion process. Dewatering centrifuges increase solid density to efficiently ship biosolids offsite. The sludge thickening and the biosolids dewatering centrifuges are critical assets used in OC San's biosolids recycling program and are needed to comply with OC San's 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 original equipment manufacturer (OEM), GEA, has identified critical equipment that requires 5-year service. The Thickening Cyclo gear units need to be replaced. The OEM parts are sourced out of Germany with a lead time of about a year.
PROPOSED SOLUTION
Approve a General Services Contract with GEA Mechanical Equipment US, Inc. (the OEM's US based service company) to purchase four new Desch gear units for the Thickening centrifuges and to rebuild four existing Desch Dewatering gear units with associated technical services. Using the Desch gears sourced out of Texas will save 24 weeks in delivery time compared to the GEA parts sourced out ...
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