Attachment B Scope of Work: Base Bids A and B Scope of Work Base Bids A and B 1.
The drawings and specifications are the contract documents and include the complete scope of work to be provided. The following is a general description of the scope and does not include all scope items.
2.
Relocate and replace any mechanical, life safety, electrical, and plumbing devices or components to accomplish work. This shall include any duct, sprinkler, fire alarm device, light, conduit, pipe, switch, vent, wire, etc. Required for demolition or installation of new work.
3.
Clean the work site each evening.
4.
Chillers C-1, C-2 and C-3 (Base Bid A) and cooling towers CT-1, CT-2 and CT-3 (Base Bid B) have been prepurchased by the owner to facilitate delivery time. Prepurchased equipment will be assigned to the successful contractor so that, once selected, that contractor becomes (1) responsible for coordination of the installation and (2) the single construction and warranty period contact for the project thereafter. Refer to project manual for equipment data, copies of equipment shop drawings and additional information.
5.
Contractor shall provide all taps for controls, chemical treatment, etc. The prime contractor shall coordinate with controls and chemical treatment for all taps required.
6.
Provide testing, adjusting and balancing of water and air flows as specified. Each vendor for the chiller, heat pump, pumps, controls, vibration isolation, and refrigerant monitor system shall visit the site and provide documentation report per 01400.
7.
Provide warranty, O&M manuals, record as-built drawings and all other specified closeout documentation per 01700.
8.
Remove everything from the job site made obsolete or not needed by this work.
9.
Provide equipment and system startup and testing.
10.
Remove everything from the job site made obsolete or not needed by this work.
11.
Davis-Bacon Act requirements and ARRA 2009 apply to both Base Bid A and B.
Base Bid A - Chiller Room Related Work 1.
Provide 600 tons of temporary cooling beginning the week of January 2, 2011. Proposed location for cooling unit(s) is in the loading dock area. Provide temporary power connection and chilled water pipes racked on hallway wall from chiller room to dock area.
2.
During premium time shutdown, provide new isolation valves and valving to isolate plant for temporary cooling operation.
3.
Accept assignment of and install prepurchased centrifugal chillers. Provide manufacturer supervised installation including startup and startup reports. Provide chiller warranty and first year maintenance.
4.
Demolish mechanical and electrical as noted. Dispose of refrigerant in accordance with authority having jurisdiction. Demolish chillers, pumps, power, controls, AHU-31, pipes, insulation, ductwork, refrigeration racks, and all items made obsolete by this work.
5.
Provide chiller heat pump, double wall heat exchangers, pumps, and associated piping for heat recovery system to heat domestic hot water.
6.
Rig new equipment into space. Open walls and ceilings as required and repair.
7.
Provide vibration isolation for chillers, pumps, pipes and fans.
8.
Piping shall include chilled water, condenser water, refrigerant vent, condensate, drain, and domestic water.
9.
Provide insulation for chilled water (Foamglas), condensate (glass fiber pipe insulation), and domestic hot water (glass fiber pipe insulation). Insulate chiller barrel and cold surfaces (Armaflex), chilled water pumps, and any surface that may condense.
10.
Provide chilled water filtration system. Insulate chilled water filter and associated piping and pump (Armaflex).
11.
Provide new cooling system for plant including five fan coil units with chilled water, condensate piping, and supply air ductwork.
12.
Provide refrigeration room safety system to include: A. Provide new exhaust system to serve machinery room only including new exhaust fan EF-24. B. Provide new supply air fan SF-1. Repair and reuse existing ductwork. Provide new diffusers. C. Provide new toilet exhaust fan for the locker rooms and a new supply air fan for outside air to AHU-28 and the electrical room. D. Refrigerant leak monitoring system to include leak detector, strobe lights, audible alarms, and signs. Interlock boiler operation to shut down boilers upon refrigeration leak detection. E. Modify existing machinery room doors so that they open outward, are all self-closing, and tight fitting.
13.
Provide power wiring for the chillers, pumps, filters, controls, fans, refrigerant alarm system, lighting, convenience outlets, etc. Provide life safety devices during construction.
14.
Existing chilled water btu metering shall remain unchanged except to relocate sensors and to monitor flow.
15.
Owner to inspect and reline, if necessary, the domestic hot water storage tank.
16.
Modify guestroom domestic hot water heaters combustion air intakes at the 4th floor.
17.
Provide domestic cold water connections to condenser water loop for ice machines and electric closet heat pump.
18.
Provide testing, adjusting, and balancing for air and water systems and testing/startup of all new systems and equipment including the chillers, pumps, VFDs, controls, refrigeration room safety system, fans, and filtration system.
19.
Phasing notes A. The intent of the project phasing is to keep the required existing pumps, piping, and electrical on-line for mechanical cooling of the chilled water loop using the temporary chiller(s). B. One premium time shutdown for the installation of new isolation valves and new connections to pipe mains will be required. Except for the premium time shutdown, chilled water will be available at all times. C. The contractor shall coordinate and schedule equipment/system shutdowns and drain downs in advance with the hotel's director of engineering to accommodate the project phasing. Shutdown times and durations will be based on building occupancy and expected weather. The date, time and length of shutdowns shall be approved in advance by the hotel's director of engineering. D. The following outlines the general project phasing. The contractor shall coordinate the phasing with all sub-contractors and with the owner. The contractor can modify the project phasing with prior approval of the hotel's director of engineering. i.
ii.
iii.
Phase 1: 1.
Install temporary chiller(s) in loading dock area. Install temporary chilled water pipes and electrical as much as possible and make ready for connection to existing systems.
2.
Demolition can start for one existing chiller, including associated chilled and condenser water pump, prior to the temporary chiller being available.
3.
Premium time shutdowns - see phasing notes on drawings.
4.
After shutdown work is complete, fill the system and place the temporary chiller on-line.
Phase 2 1.
Provide demolition of existing equipment, including associated piping and electrical, to allow for installation of new work.
2.
Existing pumps P-7 and P-8 can be demolished only after new pump P-9 is installed and operational.
3.
Install new equipment, piping, electrical, etc. And make ready for new connections to existing.
4.
New pumps P-7 and P-8 can be installed only after existing pumps P-7 and P-8 are demolished.
Phase 3
1.
Complete startup and testing of at least one new chiller. When complete, the temporary chiller and associated piping, electrical, etc. Shall be removed.
2.
Complete the installation, startup, testing and balancing of the equipment.
iv. Domestic water system shutdown: a separate premium time shutdown for the domestic water system will be required - see phasing notes on the drawings. 20.
All other work required by the construction documents not specifically indicated as being provided in a project phase shall be coordinated, scheduled and provided by the contractor.
Base Bid B - Cooling Tower Related Work 1.
Demolish mechanical and electrical as noted. Demolish cooling tower, pumps, power, controls, pipes, ductwork, and all items made obsolete by this work.
2.
Demolish existing cooling tower well. "Hyatt" sign to be removed, stored, and reinstalled on new sign support.
3.
Accept assignment of and install prepurchased cooling towers. Provide manufacturer supervised installation including startup and startup reports.
4.
Lift cooling tower and other new equipment to roof.
5.
Provide new louvered cooling tower enclosure as shown on structural drawings. Structure shall meet all Miami-Dade requirements for hurricane construction.
6.
Piping shall include condenser water, condensate, drain, and overflow. Provide condensate pumps and piping from AHU-29 and AHU-30 to cooling tower basin.
7.
Provide power wiring for the cooling tower, filters, controls, lighting, convenience outlets, etc. Provide life safety devices during construction.
8.
Replace ductwork where noted.
9.
Provide condenser water filtration unit. Provide concrete pad for unit.
10.
Provide vibration isolation for cooling tower and condenser water filtration unit. Cooling towers are Miami-Dade rated for hurricane construction. Mount cooling towers are roof per the structural drawings and Miami-Dade requirements.
11.
Provide control system for plant. Controls shall be by the Trane Company. Demolish all items made obsolete by this work. Automatic valves and dampers may be provided by the prime contractor. Provide sensors and devices interfaced with the existing system and color graphics. All wiring shall be in conduit. Trane contact: Jose Perez,
[email protected] ,
12.
Provide testing, adjusting and balancing for air and water systems and testing/startup of all new systems and equipment including the cooling tower, exhaust fans, and filtration systems.
13.
Chemical treatment for the new equipment shall be by Nalco, Inc. or Ecolab, Inc.
a.
Cleaning and pre-treatment of new equipment.
b.
Flushing of new condenser water and chilled water piping systems
c.
Provide chemical treatment for the following systems per the attachment to 15545: i.
Cooling tower and condenser loop
ii.
Chilled water loop
iii.
Heating water loop
iv.
Steam boiler
d.
Provide coupon racks and pot feeders for closed loop systems.
e.
See 15545 for additional details.
