National IDIQ Task Order Contract
Under national IDIQ Multiple Award Task Order Contract for Design-Build Services at En Route Facilities, TMG was awarded the first task order to perform major mechanical/electrical upgrades at the Air Route Traffic Control Center in Miami, Florida. The scope involved mechanical system and equipment replacements and upgrades in the control wing basement and chiller/cooling tower modernizations with associated asbestos abatement, HVAC, mechanical controls, electrical power system, fire protection, structural, and architectural upgrades and support.
TMG performed the work in a fully operational 100,000 SF facility to provide n+1 redundant cooling, power, and infrastructure to support the facility’s computing and communication equipment. The scope included the demolition of four cooling towers and the installation of four new cooling towers, five CRAC units, three 60HP vertical turbine condenser water pumps, three 60HP condenser water pumps, and all piping and appliances simultaneously. Eleven new variable frequency drives were installed in the control wing basement to power the new cooling tower fans and vertical turbine condenser water pumps in the remote cooling tower yard, as well as the new chilled water pumps and pump motors in the control wing basement.
All four 300-ton cooling towers were replaced with four new 350-ton counter-flow cooling towers. A new Schneider Electric Andover StruxureWare BACnet DDCS BMS control system of approximately 200 points was installed for the new work and integrated to run parallel with the existing Inet 1500 point controls. In addition, the Control Wing Basement was modernized in selected areas, including Room B120 with four computer room replacement units and two modular air unit replacements, B119 with one computer room replacement unit, and B134 all with new finishes and raised access flooring. Replacement motor control center and switch board upgrades were required, and replacement lighting and power circuiting were included.
The existing chilled water system was sectionalized after hours to facilitate the modernization work. This extra out-of-scope work included fabricating custom devices to drain and sectionalize the existing chilled water system to allow separation into two parts so one section could be shut down without affecting the operation of the facility. Project management skills included recognition of the requirement to perform extra work at no cost to the client to facilitate subsequent activities, as well as communications, planning, scheduling, after-hours supervision, and support of the mechanical work. This work allowed subsequent chiller removal and replacement to take place without affecting or endangering the operating systems. Noisy work was performed after hours to isolate the air traffic controllers from distracting or disturbing noise.
Detailed rigging plans and pre-activity conferences, including the crane supplier, mechanical contractor, mechanical equipment manufacturer, and general contractor were scheduled and conducted to ensure that a safe, efficient, and expedited lift in a confined space was executed. Detailed pre-activity studies also were conducted to ensure abatement containments provided personnel access and egress to emergency exits.
Additional planning was required to schedule, install, operate, and remove containment ventilation to not affect operating personnel during large-scale asbestos abatement. Structural design was implemented at no additional cost to the client to ensure the structural foundations for the temporary cooling towers, pumps, and piping exceeded South Florida Building Code requirements without affecting the schedule. Managing multiple revised submittals required constant management of the mechanical and electrical subcontractors via meetings at their facilities and a detailed active-submittal register as well as a web-based document control program.