Large Diameter Flex Duct Bellows

The Department of Defense, through the Arnold Engineering Development Complex at Arnold AFB, Tennessee, has issued a Sources Sought Notice to identify capable businesses for the procurement of two new, fully functional Large Diameter Flex Duct Bellows Assemblies. These assemblies must feature a 45.315-inch internal diameter and be fabricated from silicone-coated 1523 fiberglass with a 6-ply body and a nominal thickness of 0.12 inches. The technical requirements specify a working pressure of 30 psid internal and 15 psid external, with an operational temperature range from -60°F to +450°F. Fabrication must adhere to EJMA Standards, ASME Boiler and Pressure Vessel Code, and Drawing RJ632279.18, with welds inspected per AWS D1.1. Refurbished or remanufactured parts are strictly prohibited. The contractor is responsible for all materials, labor, equipment, and transportation, including the provision of supports, cribbing, tie downs, and weather protection to ensure safe delivery to Arnold AFB. Required deliverables include a comprehensive documentation package consisting of visual, weld, and pressure test inspection reports, axial spring rate calculations, and a standard manufacturer warranty. Assemblies must undergo hydrostatic testing to 45 psig at 70°F. Interested respondents must submit their company information, SAM Unique Entity Identifier, Cage Code, business size, and a tailored capability statement to the designated points of contact by November 19, 2026.