NorthShore Glenbrook Hospital, Central Plant Emergency Generator

Glenview, IL

NorthShore Glenbrook Hospital, mechanical room


The expansion of the hospital’s emergency and radiology departments prompted adding an additional 1,600 kW of emergency generator capacity, which required an addition to the emergency generator room. GBA provided engineering design services.

Engineering Design

The 424,000-square-foot hospital already had two 800-kW emergency generators with fuel supplied from a 3,000-gallon underground storage tank. Since there was no room to add emergency generators within the existing central plant building, an addition was constructed.

  • Two additional 800-kW emergency generators were added, with room for a future fifth emergency generator.
  • Paralleling switchgear was included in the design to allow all four generators to operate as a system.
  • The central plant building addition needed to extend over the existing underground storage tank, so the tank was replaced with a larger 8,000-gallon double-wall version, including a new tank-monitoring system with leak detection.
  • A new duplex fuel oil transfer pump and new day tanks were also added.
  • Because the central plant building is located next to a residential neighborhood, the design gave special attention to sound attenuation. The intake ductwork and radiator exhaust ductwork were fitted with sound attenuators. The exhaust louvers also needed to be a sound-attenuating type.
  • Engine exhaust management was another focus of the design.
  • Project phasing included the need for temporary fuel oil piping to allow the existing generators to be operational during construction.

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