Smith Jr High Cooling Tower Replacements, Mesa, AZ

Scope of work: Mechanical Demolition: remove two existing cooling towers, two centrifugal separators, and associated condenser water piping, cold water piping, drain piping, floor sink, concrete pylons, and structural supports from the tower yard. Remove one existing cooling VFD from mechanical room. Mechanical: provide 2 new 356-ton cooling towers, two new centrifugal separators in the Tower Yard and 2 new cooling tower fan VFDs in the Mechanical Room. Provide new 6” diameter condenser water supply and return piping from the new cooling towers in the existing Tower Yard the existing Mechanical Room. Connect new condenser water supply and return piping into existing central plant condenser water piping. Provide 4 new 6” diameter, 120v/1ph motorized valves in the condenser water piping to the cooling towers. Provide new 2" copper water piping from existing Mechanical Room to the new cooling towers in the Tower Yard. Provide new water meter tied into the EMS and new pressure reducing valve. Provide new cooling tower drain piping, centrifugal separator piping, and floor sink. Provide new Allerton EMS Controls, controllers, wiring, conduit (minimum 3/4" diameter), and programming to control the new cooling towers, motorized control valves, centrifugal separators, VFDs, and vibration switches. Integrate the new controls into the existing Allerton EMS Control System. Upgrade the existing Allerton EMS front end as required to accommodate the new cooling towers, motorized condenser water valves, vibration switches, centrifugal separators VFDs, etc. Provide commissioning to ensure proper operation of the new equipment and controls. Electrical Demolition: remove disconnects/starters, corresponding conduit, and wiring back to source from cooling tower, VFD, centrifugal separators, motorized valves, etc. Remove exiting VFD in the Mechanical Room. Electrical: Provide new starters, disconnects, conduit, and wiring to power the new cooling towers, VFDs, motorized valves, sensors, and controls. Tie new cooling tower and centrifugal separators into the existing MMC with new fuses. Structural: provide a two new approximately 15’x11’x3’ tall structural framing stands to support the new cooling towers in the Tower Yard. Provide 12” tall housekeeping pads under each cooling tower. Provide 4” tall housekeeping pads under each centrifugal separator. Fill the entire Tower Yard with 4” thick 2000 psi concrete slab to match the elevation of the existing sidewalks and slope towards the gate. Deadline for questions is August 23, 2021 by 2:00pm. Bonds