FROM: James D. Herberg, General Manager
Originator: Kathy Millea, Director of Engineering
SUBJECT:
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PLANT NO. 2 CENTRAL GENERATION STEAM TURBINE REHABILITATION, PROJECT NO. MP-105
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Approve a Change Order to the Sole Source Purchase Order with Dresser-Rand for the Central Generation Steam Turbine Rehabilitation at Plant No. 2, for an additional amount not to exceed $238,796 plus applicable taxes and shipping, for a total amount not to exceed $484,220 plus applicable taxes and shipping; and
B. Decrease contingency from $49,085 (20%) to $12,271 (5%).
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BACKGROUND
The Orange County Sanitation District (Sanitation District) operates eight Central Generation engines between both treatment plants. The engines generate approximately two-thirds of the power demand and the majority of the process heat used in the solids digestion process. The Plant No. 2 facility also includes a steam turbine to make up to 1 MW of additional electrical energy from waste engine exhaust heat.
RELEVANT STANDARDS
* Maintain a proactive asset management program
* Use all practical and effective means for recovering energy
PROBLEM
In March 2018, the Board of Directors approved a sole source purchase order with Dresser-Rand, the successor company to the original steam turbine manufacturer, to complete an assessment and standard overhaul. Staff had anticipated that if the turbine's rotor was in poor condition, a spare rotor in the Sanitation District warehouse could be used to complete the rebuild. After removal and disassembly of the steam turbine, Dresser-Rand's assessment found the rotor in the turbine could not be reliably refurbished. Also, it was subsequently determined that the Sanitation District's spare rotor in its warehouse had already been used and could also not be reliably refurbished. To provide a functional steam turbine system, a new rotor is needed, along with ad...
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