US Army, Sacramento District, Corps of Engineers, 1325 J Street, Sacramento, California 95814-2922

Z -- HANGAR REPAIRS, FIRE PROTECTION UPGRADES, BLDGS 243, 362, 365, 704, MCCLELLAN AFB, CA POC Contact: Send written responses to Contracting Division: Attn: Tom Hart. Questions may be directed to Mr. Hart by phone at (916)557-5208 or by FAX at (916)557-7854. This is neither an RFP nor an IFB, nor does the Government make any commitment that any procurement activity will follow. Solicitations are not available, nor does the Government intend to pay for information sought. The Sacramento District Corps of Engineers is seeking to identify sources that can provide non-developmental, off-the-shelf, commercially available, radiant tube heaters, like those made by Co-Ray-Vac. They must contain these salient characteristics without exception: Salient characteristics of the natural gas fired infrared radiant tube heater: 1. Condensing Type System: A. Shall be designed to operate in a condensing mode at all times. The heat of condensation shall be extracted by the system and added to the heated space in accordance with ANSI Z83.6A-90. The system shall be constructed, installed, and certified in accordance with ANSI Z83.6 and ANSI Z83.6A. 2. Burners: A. Burner assemblies shall consist of cast iron combustion chambers or materials of similar corrosion resistance, high temperature service durability burner heads utilizing surface combustion, pre-wired gas controls with electric ignition, and combustion air filters. AGA seal shall be affixed to each burner nameplate and vacuum pump, thus assuring AGA system approval. Heater design shall be AGA certified as ''Vented Infrared Heater''. Assemblies shall be minimum 85 percent efficient. B. Burners shall be designed to totally premix air and gas required for combustion before combustion actually occurs. Burners shall maintain constant proportion of fuel gas to filtered combustion air. Both fuel gas and air shall be introduced at atmospheric pressure, and flow shall be established by means of a vacuum on the downstream side of the flow metering orifices. If combustion air flow is impeded for any reason, gas flow rate shall decrease in proportion to maintain proper gas air mixture for complete combustion. C. Burners shall be designed to preclude main gas flow if any of the following abnormal conditions occur in the non-firing mode: a. Main valve fails in the open position. b. Vacuum pump motor fails to operate. c. Power fails. D. Individual burners shall not exceed 60,000 BTUs. 3. Vacuum Pumps: A. Vacuum pumps shall have heavy duty cast iron housings, with cast aluminum alloy impellers, dynamically and statically balanced, and mounted on motor shaft for direct drive. Fan shaft shall be sealed for no oxygen intrusion. B. Vacuum pumps shall be acoustically isolated from the system with Manufacturer's flexible connector with temperature rating of 350 degree F minimum. C. Motor shall be secured in vacuum pump with rubber mounts for acoustical isolation. D. Vacuum pump motors shall be provided with a centrifugal switch and/or sealed pressure switch or equivalent device to prevent energizing of the gas valves until pump operation is proven. 4. Radiant Piping (Heat Exchanger) A. Radiant pipe including tailpiece shall be new 4'' diameter black steel pipe Schedule 40 with an emissivity factor of not less than 0.9. Each threaded joint shall be wiped with a high temperature pipe joint compound. 5. Reflectors: A. Reflectors shall be of a highly infrared reflective material with a minimum reflectivity of 0.91 installed over all heat exchangers. Reflector joint pieces shall be provided over heat exchanger fittings such as elbow, crosses, and tees, so reflector covers heat exchanger pipe continuously. In order to maximize radiant output and minimize convection losses, reflectors shall protrude past the bottom of the heat exchanger pipe. Reflectors shall be installed on all radiant pipe, manifold pipe, and tail pipe. B. All reflectors at elbows, tees, crosses, vents, and pipe to vacuum pump shall have end caps to prevent convective heat from escaping. 6. Controls: A. Manufacturer shall provide a factory pre-wired and assembled control panel for each radiant system that provides pre-purge and post-purge controls and connection for up to four 24-volt factory thermostats for zone temperature control. B. The control system shall pre-purge with air for a period of at least 45 seconds (10 air changes minimum) all burners and heat exchanger pipes connected to the vacuum pump prior to the initiation of the firing sequence. C. The control system shall post-purge with air for a period of at least 45 seconds (10 air changes minimum) all burners and heat exchanger pipes connected to the vacuum pump after shutdown of the last burner firing into the vacuum pump. 7. Warranty: A. Electrical components shall warranteed by the Manufacturer for three years from date of final acceptance. B. Combustion chamber, vacuum pump housing, and Schedule 40 radiant pipe (including tailpipe) shall be warranteed by the Manufacturer for fifteen years from date of final acceptance. C. Manufacturer's warranty shall provide for repair or replacement of the above components if they are defective in either material or workmanship. 8. Manufacturer: A. Natural gas fired infrared radiant tube heating system shall be Co-Ray-Vac low intensity condensing type or equal. The Government expects to issue one Firm-Fixed Price Construction contract by sealed bidding procedures at a future date. Firms with the ability to furnish these types of heaters are encouraged to submit descriptive literature which demonstrates full compliance with the salient characteristics listed herein. All submissions should be received not later than 15 May 95. This synopsis is for planning purposes only and is not to be construed as a commitment by the Government. This has been a Sources-Sought market-research synopsis, designed to find suppliers on a brand-name-or-equal basis, either Co-Ray-Vac radiant tube heaters or their functional/physical equivalent. Any future acquisition for radiant tube heaters must meet these criteria. (0123)

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