Refrigeration Maintenance Support

Aberdeen Test Center Refrigeration Maintenance Contract Performance Work Statement Dated: 21 May 2026 Period of Performance: Background: Aberdeen Test Center (ATC) is a testing agency for the Department of the Army and houses various refrigeration systems that may not be comparable to private industry Heating and Air- conditioning Refrigeration (HVACR). The Aberdeen Test Center requires maintenance and repair services on various test chambers located at the Aberdeen Proving Ground (APG). These services require experienced and qualified technicians in the field of industrial ammonia refrigeration. This contract supports our mechanical integrity program through preventive maintenance, repairs and emergency response during a chemical release. It also is required to meet the Occupational Safety and Health Act (OSHA) requirements of the standard Combined Federal Regulation (29 CFR1910) and our Process Safety Management (PSM) program. The main front ammonia plant houses 30,000 pounds of Ammonia (NH3) which feeds three separate test chambers. Because the quantity is over the OSHA CFR-29 threshold of 10,000 pounds, a Risk Management Plan (RMP) and Safety Management Plan (PSM) is enforced and support contractors are required to be familiar with the written plans. These plans are critical to the welfare of the Aberdeen Proving Ground employees and visitors. Fixed Price Preventive Maintenance: Equipment preventive maintenance will be performed annually. All work must be completed within ATC scheduled maintenance shutdown period unless otherwise agreed upon by ATC. Shutdown periods include 2 weeks of maintenance during the Christmas holiday timeframe and again during the July 4 th holiday timeframe. These dates are not guaranteed and the maintenance period can vary in duration and scheduled dates. Equipment listed for maintenance is for general information. Contractor must field verify make, model, type and/or size of all equipment to be maintained. 1. Perform annual vibration diagnostic testing to help identify and prioritize mechanical problems. Testing shall be performed with Original Equipment Manufacturer (OEM) route specific to compressor. Analysis shall be reviewed by a factory trained technician. The results of the analysis shall be listed in the annual maintenance report. a. Bldg. 383C 1) (3) 250 HP FES Screw Compressor Packages 2) (3) 150 HP FES Screw Compressor Packages -- 1 of 5 -- 3) (3) 200 HP FES Screw Compressor Packages b. Bldg. 450 R-507 Plant 1) (2) 235 HP Frick Screw Compressor Package 2) (2) 350 HP Frick Screw Compressor Package 2. Perform annual instrument calibrations on controls and instrumentation. Calibrations must be performed with certified instrumentation. Liquid probes shall be removed and cleaned before calibration. Results of calibrations shall be listed in the annual maintenance report. a. Bldg. 383A Mobility Test Chamber (MTC) 1) (2) Chamber temperature resistance temperature detector (RTD) 2) (2) Makeup air system(s) dew-point sensor 3) (20) Makeup air system(s) temperature RTD 4) (4) Makeup air system(s) relative humidity sensor b. Bldg. 383B Firing Test Chamber (FTC) 1) (1) Chamber temperature RTD 2) (1) Makeup air system dew-point RTD 5) (10) Makeup air system temperature RTD 6) (2) Makeup air system(s) relative humidity sensor c. Bldg. 383C Ammonia Plant 1) (3) Pump Package liquid level probes 2) (1) Transfer vessel liquid level probe 3) (9) Compressor package pressure transducers and temp probes d. Bldg. 450 R-507 Plant 1) (4) Compressor Packages, pressure transducers and temp probes 2) (1) Intercooler pressure sensor 3) (1) Intercooler suction temperature sensor 4) (1) Intercooler high temperature sensor 5) (1) Intercooler subcooled liquid temperature sensor 6) (1) Surge Drum pressure sensor 7) (1) Surge Drum suction temperature sensor 8) (2) Condenser pressure sensor 9) (2) Warm pump pressure sensor 10) (2) Warm pump inlet and outlet temperature sensor 11) (2) Chiller pump pressure sensor 12) (2) Chiller inlet & outlet temperature sensor 13) (1) Outside air temperature sensor 14) (1) Engine room air temperature sensor 15) (1) High stage discharge temperature sensor 16) (4) Evaporator supply air temperature sensor 17) (4) Evaporator return air temperature sensor 18) (1) Chamber A mobile air temperature sensor 19) (1) Chamber B mobile air temperature sensor 20) (24) Valve actuators on the secondary fluid system -- 2 of 5 -- 3. Perform annual system safety checks on compressor safety components and controls. Includes low suction, high discharge, and oil pressure and temperature cutouts. a. Bldg. 383C 1) (3) 250 HP FES Screw Compressor Packages 2) (3) 150 HP FES Screw Compressor Packages 3) (3) 200 HP FES Screw Compressor Packages. 4. Perform annual Non-Destructive Testing (NDT) on a minimum of 20 locations. a. Use Ultrasonic test methods to determine wall thickness b. Supply inspection plugs at all test points c. Provide test results and list potential issues in a report format d. Equipment to be tested includes pressure vessels and system piping. Test locations include the plant and chamber equipment, and outdoor pipe rack 5. Perform annual oil analysis for compressor packages. a. Bldg. 383C 1) (3) 250 HP FES Screw Compressor Packages 2) (3) 150 HP FES Screw Compressor Packages 3) (3) 200 HP FES Screw Compressor Packages. b. Bldg. 450 450 R-507 Plant 1) (2) 235 HP Frick Screw Compressor Package 2) (2) 350 HP Frick Screw Compressor Package 6. Perform annual ammonia purity test on the Bldg. 383C refrigeration system. 7. Provide water treatment for the condensers at buildings 383C, 450, and the altitude chamber. Treatment will include all necessary chemicals to maintain year round operation and prevent scaling caused by water evaporation. T&M Emergency Maintenance: 1. Contractor shall provide emergency maintenance services, maintenance repair supplies, and refrigeration engineering services at the request …