Attachment 1 - PWS for B304 Chiller Overhaul.docx

Performance Work Statement Project Title: Overhaul of Chiller 1 at B304

1. Objectives:

This scope of work is to provide a mechanical overhaul of Chiller #1 at B304. The chiller is past its recommended timeframe for a mechanical overhaul. This is one of three chillers in use for the system, all of which are past recommended overhaul timeframes. The HVAC is critical maintaining the health, safety, and comfort of the airmen, as well as critical missions in several buildings. The chiller is a 770 ton centrifugal Trane CenTraVac model CVHF770 (CVHF770FA1HO3UV2917W1B8T1A), S/N L99K04163M, utilizing R-123. It is 460 V/60 Hz/3 phIt was installed in XXX. Troubleshooting and recent operation indicates standard wear.

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.

2. Requirements

1. The Contractor shall provide full recommended mechanical refurbishment of the entire B304 chiller including:

· Internal cleaning, including tube cleaning (evaporator and condenser)

· Inspection of waterbox and tubesheet protective coatings

· Replacement of seals & gaskets as required for disassembly and inspection

· Examination of gears, journals, and thrust bearings, and recommendation of needed replacements based on noted wear. Lubricate as needed. Replacement of major bearings shall be included as an option for replacement by modification to the contract.

· ECT services and report

· Inspection of orifices

· Leak testing and vacuum testing, as needed

· Check purge pumpout rate to verify no leaks, drain contents of rupture disk and purge vent line drip

· Plugging of tubes as needed

· Oil/refrigerant separation, oil analysis, refrigerant recharging, & oil change

· Oil & refrigerant changes, oil reclamation, chilled water filter changes and strainer cleanings

· Oil laboratory test to determine compressor condition

· Checking guide vane linkage and vane operation, as well as valve actuator operation. Lubricate as needed.

· Relief valve & piping inspection; relief valve repair or replacement as needed

· Inspection and cleaning of flow devices

· Calibration of pressure transducers and temperature sensors, including ice-bath for refrigerant temperature sensor

· Inspection of oil pump system

· Full electrical system check per manufacturers recommendations, including compressor current draw, pump and fan motor amp checks, oil heater operation check, safety control and pump interlock and flow switch checks, motor starter contact check and cleaning, terminal connection tightening, phase checks, & compressor motor resistance to ground check.

· Inspection of sacrificial anodes and replacement if > 50% loss

· Full control systems check

· Replacement of any insulation removed for the performance of the work

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

3. The Contractor shall provide testing of chiller to prove full capacity and operation capability and return the unit to service.

4. The Contractor shall provide a full parts list required for the Chiller overhaul as well as a full written overhaul report, including the work performed, parts replaced, deficiencies noted, corrective actions taken, refrigerant disposed of and charged, and corrective actions recommended for future work if noted.

APPENDICIES:

1. Pictures (below)

PWS Appendix 1 – Pictures (17 in total) image3.jpeg image4.jpeg image5.jpeg image6.jpeg image7.jpeg image8.jpeg image9.jpeg image10.jpeg image11.jpeg image12.jpeg image13.jpeg image14.jpeg image15.jpeg image1.jpeg image2.jpeg