B451 Cooling Tower Repairs PWS.docx

Performance Work Statement Project Title: Replace B451 Cooling Tower Repairs NextGen Work Task #: 10223421

1. Objectives:

This scope of work is to perform repairs as specified on the cooling tower at B451. The cooling tower fan bearings require replacement, as does the fan shaft and fan motor. All associated mounting, alignment, and fan adjustment repairs and work shall be included in the scope. The tower spray nozzles must be replaced. The exterior media panels and drift eliminator media must be replaced as well.

2. Existing Conditions:

The existing tower is an Evapco model AT 114-0724, rated at 947 nominal tons and 190,900 cfm (capacity of 2700 gpm from 95 F to 85 F at 78 F WB). The tower serial number is S/N M035174. The fan motor is 2-speed, 40 hp, 1780 rpm, 460 V / 3 ph / 60 Hz motor rated at SF 53 amps. The motor is a totally enclosed frame type 326T, continuous duty, insulation class F and the motor has a SF rating of 1.15. The cooling tower fan bearings are broken and it is presumed that the fan shaft, mounting and alignment also require correction. The fan motor is old and at its useful lifespan and requires replacement as well. The tower spray nozzles are badly corroded and plugged and require replacement. The drift eliminator media and exterior media panels are badly degraded and must be replaced.

2. Requirements

The contractor shall furnish all materials, labor, transportation, equipment, special tools, expertise, supervision, and services requested to fulfill the requirements of this contract. All task specifications of this Performance Work Statement will herein be referred to as “requirements”. No alterations, additions, or deletions shall be made unless by prior approval of the government Project Manager and the government Procuring Contract Officer (PCO). The work shall conform to the most current applicable NFPA, ASME, ASHRAE, EPA, IMC, IPC, and AFI, ETL, and Unified Facility Criteria Standards. Work shall be completed in a neat, substantial, and competent manner. All personnel shall abide by all industry safety standards, such as OSHA, and the Contractor shall provide all required PPE.

· The Contractor shall perform a site visit prior to providing a bid and starting work.

· The Contractor shall perform repairs to regain performance and operability of the tower fan. These repairs shall include replacement of the fan shaft and bearings, the fan motor, including and mounting adjustments and alignment of the motor and propeller that are needed, a new drive belt, any machining and repairs to the tower #2 fan propeller space that are noted to be needed to accommodate operational rotation, and any needed repairs to the tower #2 fan gearbox. The motor replacement shall be like-for-like in function and performance parameters. Any required electrical and control repairs and replacements found during the work shall be brought to the attention of the Government for inclusion via modification.

· The work on the tower shall include a basic cleaning of the tower and tower basin during the course of the media replacement. The cleaning shall be to industry and manufacturers recommended standards to remove algae and other organic growths, all manner of dirt and debris, loose corrosion, and scale buildup. Outer media panels shall be replaced. The drift eliminator media shall be entirely replaced. All replacement media shall be per manufacturer’s recommendations and specifications.

· The Contractor shall replace all spray nozzles in the tower with like-for-like capacity and fit nozzles per manufacturers specification.

· All waste material and equipment removed for replacement must be removed and properly disposed of off Base by the Contractor.

· On-site CE shop personnel will provide coordination for needed system operation to allow the replacements. The Contractor shall provide all lock-out-tag-outs as needed.

· The Contractor shall provide start-up and operational testing of cooling tower to prove capacity and operability capability and to return the system to service.