FROM: James D. Herberg, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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PLANT NO. 2 TRICKLING FILTER "B" ROTARY DISTRIBUTOR MAST REPLACEMENT
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Sole Source Purchase Order Contract to Ovivo USA, LLC (Ovivo) for a direct replacement Center Mast assembly for the Plant No. 2 Trickling Filter B solids contact, Secondary Treatment, in an amount not to exceed $507,272, plus applicable sales tax and shipping; and
B. Approve a contingency of $50,727 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) Trickling Filters at Plant No. 2 consist of three 150-foot diameter rotating assemblies. This trickling filter process provides secondary treatment rated at 60 MGD average during dry weather and approximately 182 MGD during peak wet weather capacities. The trickling filters are engineered to remove the organic content in wastewater utilizing micro-organisms living on the filter media. Each trickling filter is equipped with a motor-operated rotary distributor assembly to uniformly distribute the primary treated flow over the media.
RELEVANT STANDARDS
* Commitment to safety & reducing risk in all operations
* Maintain a proactive asset management program
* Maintain a culture of improving efficiency to reduce the cost to provide the current service level or standard
PROBLEM
During normal operation, Trickling Filter B's 150-foot diameter spinning distributor arms tripped on over-torque. After further investigation, significant damage was found to the Trickling Filter B rotary distributor arm bearing and bearing surface. The failed bearing and upper bearing plate were replaced, and temporary repairs were made to the lower mast bearing surface. The lower mast bearing surface is part of the structure. A permanent solution is needed to maintain the required sec...
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