FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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PURCHASE OF BAR SCREEN DRIVE SHAFT ASSEMBLY FOR PLANT NO. 2
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Sole Source Purchase Order with Infilco Degremont Inc. for the purchase of one spare drive shaft assembly for Plant No. 2 Bar Screening Facility, Model 316SS, for a total amount not to exceed $96,771 plus applicable sales tax & freight charges; and
B. Approve a contingency of $4,839 (5%).
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BACKGROUND
The Orange County Sanitation District (OC San) Headworks at Plant No. 2 uses six bar screen assemblies to provide screening removal of solids and other non-biodegradables from influent wastewater. The bar screens are designed for protection of downstream equipment and efficient treatment. As unfiltered wastewater passes through a bar screen, debris collects on the steel bars. A mechanical rake removes large objects such as rags, trash, wood, and other debris from the bars and allows the influent wastewater to enter the Headworks for further treatment.
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
Bar screens are critical assets to the wastewater treatment process. Due to the nature of the equipment, bar screen failures can be unpredictable. The lead time for purchasing a new main drive gear assembly exceeds 12 weeks as it is not an off-the-shelf item.
PROPOSED SOLUTION
Procure a spare drive shaft assembly from the Original Equipment Manufacturer (OEM), Infilco Degremont Inc., which is compatible with all six Plant No. 2 bar screens. In the event of catastrophic failure of a gearbox, adding a spare unit to OC San's inventory will reduce the risk of significant downtime and equipment unavail...
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