FROM: James D. Herberg, General Manager
Originator: Rob Thompson, Assistant General Manager
SUBJECT:
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MP-275/MP-276 CENTRAL GENERATION ENGINE OVERHAULS AT PLANT NOS. 1 AND 2
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GENERAL MANAGER'S RECOMMENDATION
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RECOMMENDATION:
A. Award a service contract to UPS Midstream Services, Inc. to provide Central Generation Engine Overhauls at Plant Nos. 1 and 2 (for a total of two engines), Specification No. S-2019-1074BD, for a total amount not to exceed $5,636,335; and
B. Approve a contingency of $1,127,268 (20%).
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BACKGROUND
The Orange County Sanitation District (Sanitation District) operates eight Central Generation (Cen Gen) engines manufactured by Cooper Bessemer, now part of General Electric (GE). These engines are no longer in production, but parts are available from GE and other third-party vendors. The engines generate approximately two-thirds of the Sanitation District's electric demand. Additionally, waste heat from the engines is recovered and supplies the majority of the process heat demand used in the solids digestion process and the absorption chiller at Plant No. 1 (which provides cooling for the Administration Building, Laboratory Building, Central Generation Building, and Operations Building). At Plant No. 2, the waste heat generated by the engines is also converted into electrical energy using a steam turbine.
The Cen Gen engines are recommended to have a major bottom-end overhaul at 140,000 run hours, approximately every 20 to 25 years. The engine types installed at the Sanitation District in the mid-1990s are not common. There are few companies in California that supply these heavy rebuild services. There have been three unsuccessful bid attempts by the Sanitation District to accomplish the bottom-end overhauls. Over the past three years, bids were received, but were deemed non-responsive for various commercial reasons and ranged from $2.6 million to $4.8 million, per engine.
RELEVANT S...
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