FROM: James D. Herberg, General Manager
Originator: Riaz Moinuddin, Director of Operations & Maintenance
SUBJECT:
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PLANT NO. 2 OXYGEN REACTOR PURGE VALVE AND ACTUATOR ASSEMBLIES 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 to Integrated Process Technologies for the purchase of four DeZurik 20" 316 SST Oxygen Cleaned Purge Air Control Valves and Limitorque Actuator assemblies for the Plant No. 2 Activated Sludge Plant in an amount not to exceed $200,597; and
B. Approve a contingency of $20,059 (10%).
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BACKGROUND
Orange County Sanitation District (OC San) Plant No. 2 operates an Activated Sludge Plant that uses high-purity oxygen. High-purity oxygen is introduced to the sealed vapor space above the biological reactors and mixed into the water and biomass. Combustible gases are created in the biological reactor and can accumulate in the vapor space above the mixed liquid. Safety purge systems are used to prevent an unsafe mixture of gases. The purge systems consist of combustible gas analyzers, valves, and purge fans. When the analyzers detect a high level of combustible gases, the oxygen feed system is stopped, the purge valves open, and the fans are started to purge the vapor space above the biological reactor with air. There are purge air systems to serve both the East and West biological reactors. Each purge air system includes two purge fans and two purge air control valves.
RELEVANT STANDARDS
* 24/7/365 treatment plant reliability
* 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
The Plant No. 2 Activated Sludge Plant utilizes four Dezurik/Limitorque purge valve and actuator sets. The purge valves and actuators were installed ...
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