Government Center - Hydronic Piping, Chiller and Water Pump Replacement

ESTIMATED COST: $6,076,200.00 - $6,396,000.00. This project consists of the Government Central Plant's replacement of existing hydronic piping system chillers and pumps. 1. Remove and replace existing hydronic piping including the underground hydronic piping between central plant and the Government Center and RTC building. 2. Provide a temporary system to maintain cooling and heating operations until system is successfully operational and can be turned over to Government Center and RTC buildings. Refer to sheet M0.6 for capacity. a. Include self-contained temporary air- cooled chiller with required pumps and appurtenances to maintain operating systems during replacement. Pumps shall be connected to building DP sensor to adjust VFD. 3. Chiller Replacement a. Remove and replace three (3) 500-ton chillers. b. Remove and replace all isolation valves of condenser and chilled water loops for each chiller. c. Remove and replace actuated valve and actuators on condenser and chilled water loops. d. Modify existing chilled water pipes for new chiller configuration. 4. Chilled Water Pump Replacement a. Remove and replace (3) chilled water pumps with bell and gossett pumps. b. Remove and replace chilled water pump variable frequency drives (VFD's). c. Remove and replace all isolation valves, flow control/check valves and install temperature gauges at each chiller on condenser and chilled water loops. 5. Condenser Water Pump Replacement a. Three (3) 500-ton cooling towers and one (1) 650-ton cooling tower to remain. Existing VFD's for each shall be removed and replaced. b. Remove and replace all existing condenser water piping, isolation valves, three (3) condenser water pumps, common header piping, and associated branch piping and all pressure and temperature devices. Four (4) existing sand separators to remain. c. Remove and replace existing VFD's for existing pumps 'VP-01,' 'VP-02,' and 'VP-03.' 6. Abandon in place all unused existing site hydronic piping and backfill with lightweight concrete slurry. 7. Remove and replace existing refrigerant monitoring system with new. 8. Provide associated electrical and mechanical demolition and modifications for new equipment as shown in drawings. 9. Structural: Government Center Parking Lot canopy shall be structurally modified based on new routing of hydronic piping. Chiller pads to be extended to accommodate size of new chillers. 10. Provide power from existing main switchboard to temporary portable air-cooled chiller. 11. Provide interface with associated BMS controls. 12. Provide test and balance services and report and a part of commissioning. 13. Modify existing water treatment system for new equipment configuration. Contractor work in phases to accommodate Owner's occupancy requirements during the construction period, Coordinate construction schedule and operations with Owner. Question Cuttoff Date & Time 6/5/2023 08:00:00 PM (ET)

Division 23 -

Heating, Ventilating, and Air Conditioning (HVAC), Instrumentation and Control for HVAC, HVAC Air Distribution, Central HVAC Equipment.