Featured Projects: Federal

US Federal Bureau of Prisons: Atlanta, GA

Peachtree Mechanical Inc. was contracted under a firm fixed price to construct a brand new 15,000 square foot inmate service building. This building included the following but not limited to: site utilities, grading, concrete curb and gutter, slab on grade, security fencing, block, brick CMU building construction, structural steel frame, metal seam roofing, drywall, special floor systems, epoxy floor finishes, shelving, security glass and window systems, security door systems, automated roll up doors, electrical high voltage power service, duct banks, electrical gear and building service, Lighting, mechanical utility services, central Chiller Plant with 2000 tons of chilled water, air handlers, pumps, duct work, under slab plumbing systems drain, waste, vent service, exhaust systems, laundry systems, complete DDC Controls system, fire life safety systems, sprinklers, test and balance and commissioning.

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Postal Facility: Crown Rd. Atlanta, GA

Peachtree Mechanical Inc. was contracted under a firm fixed price to perform a total Energy Optimization HVAC and Electrical system upgrade. Our scope included the following: Furnishing and installing (20) new large roof top units DX system in excess of 400,000CFM while maintaining temporary heating and cooling for the facility. These DX units were gas fired for heat and required the routing of over a 1000 feet of new gas line along the existing roof. This new DX system was to replace an existing old and failing chiller plant complete with cooling towers, chillers, pumps, boilers, storage tanks and other hydronic specialties which will be completely demolished. Peachtree Mechanical was required to provide a complete and comprehensive design and installation of the new structural steel systems required for these new DX roof top units. These new units weighed in over 14,000+ lbs. each. We are continuing to demolish the existing (20) chilled water coil Air Handling Units that are located below the roof line and just above an 24/7 fully operational and active postal operation daily. Our scope also included demolishing over 120,000 square feet of acoustical ceilings in active office areas. We provided wall and floor protection to the postmaster generals offices and other critical administrative office areas disturbed during this phase of the project. The requirement also included the installation of all new HVAC ductwork and conduit were installed with vav boxes in these occupied office areas that covered 2 floors of postal administrators. New sheet rock wall systems, fire rated wall systems, acoustical ceilings and painting were required to be installed after duct work installation. New overhead raceways, conduits and electrical rough ins were completed in the spaces as well. With active offices and critical environments, Peachtree had to provide temporary cooling measures and continually monitor these critical areas while activities we performed. Planning and monitoring were required to mitigate dust and debris from affecting union postal workers in an active construction area. While upgrading the HVAC system the electrical system also required the following; increased the rating of 4 existing double ended switch gear by replacing 8 750 KVA transformers with 1250 KVA transformers, replaced existing 350 MCM 4160 primary feeds with new 500 MCM 4160 feeders, replaced existing 400 amp draw out breakers with new 600 amp draw out breakers, and modified existing bus with new 600 amp sub panels to feed new Roof Top Units. Other scopes of this project required all new DDC Controls system, fire alarm system upgrades and monitoring. Replaced existing 8-750 KVA 4160-480volt transformers in the existing double ended switchgear with 8 new 1250 kva 4160-480-volt transformer. Project required replacement of existing 250 mcm 5kv cable with new 500 mcm 5kv 4160 cable. There was approximately 90000 ft of new 5kv cable installed, tested, and terminated.

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Postal Facility: West Columbia, SC

Peachtree Mechanical Inc. was contracted under a firm fixed price to perform a total HVAC replacement and controls upgrade. The facility was experiencing several cooling issues with their process equipment as well as conditioned office spaces. The existing Trane chillers were not properly functioning. Peachtree provided temporary cooling measures during the initial equipment changeout processes. Shutdowns and pipe taps had to be coordinated in order not to impact mail processing equipment. Any shutdown of process equipment would have had major impacts to the facility financially as well, as providing customers with overnight packages and services for surrounding geographical areas. Peachtree replaced the existing chiller plant system with 3 new 650-ton magnetic bearing centrifugal chillers, 3 cooling towers, 3 chilled water pumps, 3 condenser water pumps, and all associated appurtenances, trim and accessories. Peachtree also replaced the existing air separator, filtration, and water treatment equipment associated with the condenser water system. The controls system associated with all the above equipment was upgraded to match the more recent energy upgrade carried out in the rest of the facility. Several installations had to be coordinated and scheduled for this one holiday in order not to impact facility operations. Peachtree also built and installed the structural steel platform system that held the 3 new cooling towers and filtration systems. In similarity Peachtree mechanical installed new concrete infrastructure for cooling towers. This project included upgrade to primary electrical systems

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Postal Facility: Columbia, SC.

Peachtree Mechanical partnered with the postal facility in Columbia, SC to provide a solution to upgrade their aging central plant while providing a more energy efficient chilled water distribution system. The scope of work was as follows:
  • Replaced the existing chiller plant system with (3) new 650-ton magnetic bearing centrifugal chillers, (3) cooling towers, (3) chilled water pumps, (3) condenser water pumps, and all associated appurtenances, trim, and accessories.
  • The project also replaced the existing air separator, filtration, and water treatment equipment associated with the condenser water system.
  • The control systems associated with all the above equipment was upgraded to match the more recent energy upgrade carried out in the rest of the facility.
  • Replaced existing wiring and conduit from each piece of equipment to their associated Motor Control Center.
  • Test and Balance and Commissioning of all new equipment and systems.

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