FROM: Robert Thompson, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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PLANT NO. 2 TRICKLING FILTER A, B, & C FILAMENT-WOUND BUSHINGS
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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 to Ovivo USA, LLC for four filament-wound bushing conversions for Plant No. 2, for an amount not to exceed $370,940, plus applicable sales tax; and
B. Approve a contingency of $37,094 (10%).
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BACKGROUND
The Orange County Sanitation District (OC San) trickling filter at Plant No. 2 consists of three 150-foot-diameter rotating assemblies. This trickling filter process provides secondary treatment at an average capacity of 60 MGD during dry weather and approximately 182 MGD during peak wet weather. The trickling filters are engineered to remove organic content from wastewater, using microorganisms 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.
Stabilizer bushings are critical components of the trickling filter rotary distributor. The existing bronze bushings require manual grease injections every two weeks. Replacing the existing bronze bushings with filament-wound bushings will eliminate the need for routine lubrication, reduce confined-space entry requirements, and help maintain optimal equipment performance.
RELEVANT STANDARDS
Maintain a proactive asset management program.
Meet volume and water quality needs for the GWRS
PROBLEM
The Plant No. 2 trickling filter rotary distributors have experienced repeated equipment failures due to inadequate lubrication of the stabilizer bushing assemblies and harsh working environments. A more reliable stabilizer bushing assembly is needed to reduce maintenance requirements, eliminate the need for frequent routine lubrications, and im...
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