Telecom

AT&T America's Center 4th Floor Remodeling

Existing fourth floor has a total approximate area of 50,000 square feet of space. Of the 50,000 square feet, only one quarter of the space is occupied, that area being the “NW” corner of the building. The remaining three quadrants (SW, SE and NE) are presently empty. Under this project, these areas will be totally refurbished to accept personnel from other areas.

The entire fourth floor is cooled by two large chilled water air handling units. Existing AHU04A serves the NW and the SW quadrants while existing AHU 04B serves the NE and SE quadrants. The existing medium pressure supply air distribution systems consists of flat oval mains, (with a double wall section from units to first taps) round branches and terminating in old Carrier “moduline” air terminals (combination VAV box and diffuser) most of which are malfunctioning and/or not functioning at all.

Under this project, existing galvanized steel supply air systems (2) shall be all taken out from quadrants SW, SE, NE and replaced with new medium pressure, galvanized steel supply air ductwork systems (and re-connected to existing air handling units) complete with new variable air volume boxes, galvanized steel ductwork, (downstream of boxes) flexible ductwork, terminating in new air distribution devices, (along with new r/a devices) and controls for new boxes.

With exception of existing rooms 242 and 427, (actually one large room) existing AHU04B serves existing unoccupied SE and NE quadrants and will be able to be de-energized 100% only “after” these two rooms are disconnected from said unit and connected to existing AHU04A thru new s/a ductwork, and a new variable air volume box (with a new thermostat). This work will be done before beginning with any other work and work shall be done after hours.

Also, since existing AHU04A serves existing NW and SW quadrants and NW quadrant “must” remain operational, contractor shall provide/install a new zone damper on main branch which serves the entire SW quadrant.

Said damper shall also be installed at the beginning of the project after hours. NW quadrant will also be provided with several new zone dampers since it has been determined that existing modulines boxes will not be able to handle the new duct pressures. Also, refurbished areas shall be provided with eighteen (18) new carbon dioxide sensors in order to implement demand control ventilation and thus save energy.

The work shall be done in three phases.

Design Completion Date: June 2013

AT&T FT Lauderdale Annex CO New Chiller Plant  

Existing chiller plant presently consists of the following equipment:

1 existing 130 ton air cooled chiller.

2 existing 52 ton air cooled chillers.

2 existing chilled water pumps – 20 HP each – 442 GPM each (one stand-by). Each with a variable frequency drive.

Existing chiller plant has several deficiencies. They are as follows:

Two existing 52 ton air cooled chillers have reached the end of their useful service life and need replacement.

Existing chiller plant no longer has redundancy capacity “and” building equipment heat loads are increasing.

Owner has decided to build a new water cooled chiller plant “inside the building (in basement) with a starting capacity of 159 ton and with enough room for the installation of a “future” second 159 ton water cooled chiller. The two existing 52 ton air cooled chillers and large sections of chilled water piping will be removed. Existing chilled water pumps (and their respective variable frequency drives (2) located inside second floor air handling unit room) shall also be removed and replaced with new larger pumps and VFD’s. Existing air separator and expansion tank in same room shall remain.

The new basement floor chiller plant, at minimum shall consist of the following equipment:

1 new 159 ton water cooled chiller (with space and connection for a 2nd 159 ton water cooled chiller).

2 new dual-arm chilled water pumps – 60 HP each – 765 GPM each (one stand-by) each pump with a new VFD.

2 new dual-arm condenser water pumps – 25 HP each – 900 GPM each (one stand-by) each pump with a new VFD.

1 new 160 ton cooling tower – 7.5 HP motor, a new galvanized steel support structure, (for 2 towers) along with new city water connections, drain piping, emergency well water piping, sunblock algae balls. Ecology cells and connections for future tower.

1 new complete emergency well water pump system.

1 new refrigerant monitor/purge system.

1 new Siemens energy management system for entire new chiller plant.

1 new water leak detection system.

1 new motorized volume damper (with controls) for chiller plant along with r/a transfer opening (each with FD).

1 new water evacuation system (entire chiller room will be diked).

Only one chilled and condenser water pump shall run. The other pump will be 100% redundant.

New basement chiller plant shall be connected to existing chilled water system at first floor chiller yard by using valved piping presently connected to existing 52 ton air cooled chillers. New connections to existing 130 ton Trane air cooled chiller will require a “pipe freeze” to replace existing valved connections which are damaged.

Both existing 52 ton air cooled chillers shall run while this work is being done. Under no condition shall the existing chilled water system be de-energized.

Existing 4”ø “rapid deployment chiller connection” PVC piping at first floor level shall be removed entirely and replaced with new 6”ø schedule 80 PVC piping (identical routing – re-use existing supports) all painted and identified.

The work shall be done in three phases.

Design Completion Date: November, 2013

  AT&T Boca Main CO New Chiller Plant. 

Mechanical engineering/design to remove existing roof mounted air cooled chillers and replace with 2-206 ton 0.62KW/ton water cooled chillers to be installed indoors. 2-215 Ton Cooling Towers with factory low sound option will be installed on the roof. Each cooling tower will have a 10 HP fan motor with Variable Frequency Drive (VFD). The two (2) existing chilled water pumps will be replaced with 1 Dual Arm Armstrong chilled water pump set, each of the 2 pumps in the Dual Arm Armstrong pump set will have its own VFD and it will be sized to pump enough chilled water flow to satisfy the 2-206 Ton chillers (1,000 GPM, 130 feet TDH and 60 HP motor) at 60 hertz. The second 1,000 GPM, 130 feet TDH, 60HP pump will be 100% stand-by. New Armstrong condenser water pumps will be installed in the same room as the chillers.Each of the 2 condenser water pumps will have its own VFD and it will be sized to pump enough condenser water flow to satisfy the 2-206 ton chillers (1,290 GPM, 60 feet TDH and 30 HP motor) at 60 hertz.The second 1,290 GPM, 60 feet TDH, 30 HP condenser water pump will be 100% stand-by. There was new condenser water piping and major modifications to existing chilled water piping and major upgrades to existing EMS in addition to Ashrae 15 Refrigerant monitoring and exhaust system in chiller room. 

Design Completion Date: October 2011

Construction Completion Date: December 2012

 

AT&T Palm Beach Gardens CO Chiller Plant Upgrades 

Mechanical engineering/design to add 1 new 175 Ton water cooled screw chiller in a new chiller room on the 2nd floor and 3 new cooling towers on the ground, upgrade EMS and expand it to control all above new equipment, major chilled water and condenser water piping modifications, specify 2 new chilled water pumps with VFD’s and 2 new condenser water pumps. 

Design Completion Date: May 2010

Construction Completion Date: March 2011

AT&T Delray Beach CO New AHU’s and Ductwork. 

Mechanical engineering/design to add 2 new 22,000 CFM each (100% redundancy) stacked VAV chilled water AHU’s in a new 1st floor AHU room. These new AHU’s will cool the entire 1st floor area. New 48” x 36” main supply duct will run from new 1st floor AHU’s to be located in the extreme south end of the 1st floor to the north side of 1st floor where new and future telephone equipment will be installed and existing 1st floor Multizone AHU and associated ductwork and chilled water piping will be removed.

Also, 2 new 15,000 CFM each (100% redundancy) stacked VAV chilled water AHU’s will be added in an existing 2nd floor AHU room. These new AHU’s will cool the North area of the 1st floor.

New chilled water piping was added for all 4 new AHU’s and major upgrades were made to existing EMS.

Design Completion Date: August 2011

Construction Completion Date: December 2012

AT&T Palmetto CO New Chiller Plant 

Mechanical engineering/design of a new 500 ton water cooled chilled water plant consisting of 2 – 250 ton water cooled screw chillers, 2 – 250 ton SS counterflow cooling towers with VFD’s, 2 condenser water pumps with VFD’s (one of which is 100% redundant), 2 chilled water pumps with VFD’s (one of which is 100% redundant), well and well pump for emergency cooling tower make-up water, Lakos condenser water filtration system, cooling tower city water make-up, EMS controls, refrigerant monitoring and exhaust system and major piping work to convert building from existing 250 ton air cooled chiller plant to new 500 ton water cooled chiller plant.

Design Completion Date: September 2012

Construction Completion Date: May 2013

AT&T Hollywood Main CO Major Chiller Plant Upgrades 

Existing three story building has a chiller plant which contains two water cooled chillers; one is a recently installed Trane 125 ton. The second chiller is an old Carrier 80 ton chiller which will be removed and replaced with a new Trane 125 Ton. Chiller plant has two existing chilled water pumps and two existing condenser water pumps. All four existing pumps will be removed and replaced with new larger pumps (along with their associated piping, electrical, VFD’s, drain piping, valves, conc. Pads, and etc).

In addition, the chiller plant will be provided with a new refrigerant monitor/purge system and the plant will be provided with air conditioning (presently being supplied conditioned air thru an existing 12x 6 s/a grille with no way of controlling flow) thru a new variable air volume box.

At the roof, there are two existing cooling towers. One is a Marley 150 ton “quadraflow” which is operational and the second is a 100 ton cooling tower which is damaged beyond repair. This cooling tower will be removed (along with its existing piping, electrical, controls, support structure, and etc) and replaced with a new 132 ton stainless steel cooling tower. New cooling tower will be installed on top of new cooling tower support structure (with a new arch. Screen enclosure) which will be big enough to accommodate a “second” future cooling tower.

Design Completion Date: January, 2013

Construction Completion Date: December, 2013

AT&T Canal CO Chiller Plant Upgrades

Engineer/design/specify the replacement of all existing PVC condenser water piping in chiller plant with new welded steel piping, design phase testing to measure condenser and chilled water flows at each piece of major chiller plant equipment, replacement of existing chilled water pumps with new larger ones for redundancy purposes, air condition chiller plant,  add refrigerant monitoring and exhaust systems in Chiller Room as required by FBC and Ashrae Standard 15, upgrade lighting in chiller room because it is inadequate at the present time, replace existing chiller plant room doors (1 set double door and 3 single doors), add water leak detector(s) and associated controls.

Repair Spaulled Beam East Wall of Chiller Room, Cooling Tower side. Provide a Concrete Step Platform at Door 5 from Chiller Room to Cooling Tower Area, Seal and Paint exterior of Chiller Room Walls (East Wall, South Wall, and West Wall) and remove existing Floor Drains and replace with new Floor Drains including floor drain piping on 2nd floor.  

Design Completion Date: July 2012

AT&T Naranja CO New Sanitary Lift Station and Connection of Building to Miami-Dade County Sanitary Line. 

Civil, Plumbing and Electrical engineering design for removal of existing Septic Tank, add a new lift station and connect building to existing street sanitary main.

Design Completion Date: October 24, 2008

AT&T Miami Beach CO Chiller Replacement Project

Provided Mechanical and Electrical engineering and design services for the removal of two existing 70 ton each roof mounted air cooled chillers and replacement with one (1) new 140 ton roof mounted air cooled dual power source chiller. Two new 600 amp circuit breakers were installed in existing House Service Panel and new wires were run from House Service Panel to new chiller. Most of existing conduits were re-used.

Design Completion Date: October 2014

AT&T Jacaranda CO Chiller Replacement Project

Provided Mechanical and Electrical engineering and design services for the removal of existing approximately 100 ton chiller located in chiller room and its associated remote air cooled condenser located outdoors on a concrete pad. Removed chiller was replaced with a new 120 ton air cooled chiller outdoors on top of a concrete pad where old air cooled condenser was. Existing 300A CB in MCB was re-used but new wires and conduits were run to new chiller.

Design Completion Date: October 2014

AT&T Fort Pierce CO Chiller Replacement

Performed mechanical and electrical engineering/design for the replacement of existing 110 ton water cooled chiller with a new 140 ton water cooled chiller and upgraded/modified chiller room exhaust system to comply with Ashrae Standard 15.

Design Completion Date: September 2016

 

AT&T Port St. Lucie CO Building Addition 

Mechanical engineering/design to add 2 new 140 Ton each air cooled chillers, 2 new chilled water pumps, air separator, expansion tank, major chilled water piping (underground and above ground) expansion, 2 new large 46,000 CFM each custom made VAV Air Handling Units, new ductwork and major expansion of EMS. 

Design Completion Date: July 2010

AT&T Alhambra CO AT&T Alhambra CO Chiller, Pump, and Cooling Tower Replacement

Mechanical engineering/design to replace existing CHL01B chiller with a new larger capacity 150 ton chiller, replace existing pumps with new larger ones as follows: 2 New chilled water pumps each sized to pump thru 2 – 150 ton chillers (720 GPM) at 60 hertz. Second chilled water pump will be 100% redundant. And 2 new condenser water pumps each sized to pump thru 2 – 150 ton chillers (900 GPM) at 60 hertz. Second condenser water pump will be 100% redundant and add 4 new VFD’s one for each pump. Replace 250 ton Cooling Tower with a new 200 ton Stainless Steel Cooling Tower. As a result of existing Code Violations outside air intakes to all AHU’s in Building had to be sealed and a new outside air supply fan, ductwork and motorized dampers had to be included in the design in order to keep outside air intakes at least 25 feet from the Cooling Tower.

Design Completion Date: October 2016

AT&T Building Power Studies 

Comprehensive and detailed Power Studies consisting of short Circuit, Coordination and Arc Flash Power studies for the following nineteen (19) different large AT&T Buildings in South Florida:

 

Hollywood West CO, Hollywood Main CO, Hallandale Beach CO, FTLD Annex CO, Coral Ridge CO, Cypress CO, Plantation CO, Delray Beach CO, Pompano Beach CO, FTLD POP, Lake Worth CO, Fort Myers POP, Palmetto CO, Indian Creek CO, Miami Beach CO, Allapattah CO, Miami, Metro CO, Kendall CO, Headquarters Building (Miami)

AT&T Biscayne CO Chiller Replacement

Performed mechanical and electrical engineering/design for the replacement of existing 80 ton air cooled chiller with new 100 ton air cooled chiller.

Design Completion Date: September 2016

FTLD POP POI Room Expansion Project 

Performed Mechanical and Electrical Engineering/Design for the replacement of existing 10 ton up flow CRAC unit to a new 40 ton down flow chilled water Liebert CRAC unit. Old 10 ton up flow Liebert CRAC unit and its associated supply air duct and chilled water piping were removed. New CRAC unit was connected to new 4ӯ chilled water piping on roof that was connected to existing 6ӯ main pipes on the roof via new wet taps. Existing branch duct from adjacent AC-2, 3 and 4 supplying POI room, was capped. New condensate drain pipe, drywell and new BFMS controls were also included as part of this project. Electrical power to new CRAC unit was provided from 480v panel located inside Chiller Room. New VESDA system was provided in return air intake of new CRAC unit. Fifteen lay-in light fixtures in old Guard office and Lounge were also removed and replaced with new ones to match existing ones. New duct smoke detector was also installed in new CRAC unit supply.

Design Completion Date: April 2016

AT&T Pembroke Pines Major chiller plant expansion and major 2nd floor duct modifications

Existing two story building is presently being cooled by two existing air cooled chillers. One is a York 120 ton air cooled chiller which is approximately 20 Years old and the second is a Trane 80 ton air cooled chiller which is approximately 20 years old (both located on east side of building). Both chillers will be removed and replaced with two new York 200 ton air cooled chillers (full redundancy) which will be installed on the roof of the second floor. Existing 15 HP chilled water pumps (located on first floor inside east air handling unit room each with an existing variable frequency drive) have no redundancy and will be replaced with two new chilled water pumps (and new variable frequency drives) to attain full redundancy.

In order to do the work mentioned above, it will be necessary for the contractor to install “temporary” equipment consisting of one Owner provided 145 ton air cooled chiller and two owner provided chilled water pumps along with “temporary” chilled water piping consisting of PVC piping along with hot-taps and “pipe freezing”. With the exception of the existing RDC PVC piping at first floor level, all existing chilled water piping will be removed and replaced/routed new.

Also, at second floor, northeast quadrant of building, there is a large existing telephone switch array which is not being provided with the required amount of cold air and presently, some of the bays are running somewhat hot (depending on location). Existing supply air ductwork system serving said area comes from existing “stacked” air handling units (AHU02A and AHU02B – along with other small areas).

Each of these two units has a 20 Hp motor (each with an existing variable frequency drive). These two motors will be removed and each will be replaced with a new 40 HP motor (Baldor super e) and sheaves as required.

All new work shall be done without having to shut down the existing chilled water system. All new work shall be done in four phases.

Design Completion Date: May 2013

Print Print | Sitemap
Copyright© 2017 ProCon Engineering, Inc.