FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
title
PLANT NO. 1 PURCHASE OF PROGRESSIVE CAVITY PUMP REPLACEMENT PARTS
end
GENERAL MANAGER'S RECOMMENDATION
recommendation
RECOMMENDATION: Recommend to the Board of Directors to:
A. Approve a Sole Source Purchase Order to Cortech Engineering for the purchase of eight Seepex pump rotors and one stator for the sludge thickening and dewatering facility, for a total amount not to exceed $216,210, plus applicable sales tax and shipping; and
B. Approve a contingency of $21,620 (10%).
body
BACKGROUND
The Orange County Sanitation District (Sanitation District) sludge thickening and dewatering facility at Plant No. 1 uses thickening centrifuges that are critical to the sludge handling process. The thickening facilities handle all sludge from the primary and secondary clarifiers before being transferred to the digesters. Removing extra water from the sludge has the effect of increasing the capacity of the digester complex.
All primary and secondary sludge is collected and mixed in a common wet well. This mixed sludge slurry is sent through one of three thickening trains. Each train has feed pumps, a centrifuge, and two thickened sludge transfer pumps and associated ancillary equipment to move the solids to the digestion complex.
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 gritty nature of primary sludge causes significant wear to the thickened sludge transfer pumps and ancillary equipment. The thickened sludge transfer pumps are experiencing reduced pumping capacity attributed to pump rotor wear.
PROPOSED SOLUTION
Procure replacement Seepex pump rotors and stator parts to restore system capacity to the solids handling process.
TIMIN...
Click here for full text