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Submerged Flight & Dry Flight Conveyor Installations

Day & Zimmermann provided supervision, craft labor, and construction services to install a United Conveyor-supplied Submerged Flight Conveyor (SFC) system and Dry Flight Conveyors (DFC) at MidAmerican’s Neal Energy Center Unit 3 during the spring 2018 outage. After the dry ash conversion project began, MidAmerican tasked D&Z with completing repairs on Unit 3’s fly ash silo fluidization system.

Work scopes for both projects included the following.

  • Demolished the existing bottom ash equipment, clinker grinders and foundations.
  • Major modifications to pyrites, service water, and economizer ash recovery piping systems.
  • Removed all electrical associated with the bottom ash system.
  • Installed SFC, incline, transition hopper, and seal trough with all associated water and pyrite piping and pumps.
  • Installed new electrical systems and controls, including the addition of a new motor control center, transformers, and control panel.
  • Installed DFC and supports under the economizer hoppers and transfer conveyor to SFC chute.
  • Erected new ash bunker enclosure complete with roofing, siding and doors.
  • Self-performed all civil, mechanical, and structural scopes, including concrete foundations, insulation, painting, piping interferences, and lead paint abatement.
  • Detailed, fabricated, and installed new structural steel and modifications to existing vertical supports and platforms
  • Removed and replaced the existing stone tray assemblies in the ash silo.
  • Cleaned ash from the air injection piping.
  • Removed and replaced all check and isolation valve assemblies in the room below the silo.

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