Hydro-Turbine Thrust Bearing Oil Coolers

US Army Corps of Engineers, Portland District is soliciting for the purchase of twelve (12) hydro-turbine thrust bearing oil coolers for use at The Dalles Lock and Dam Project. On or about 01 December 2017 a formal request for proposal with detailed specifications will be attached to this announcement. The vertical loads in a hydro turbine-generator are supported by the thrust bearing. The oil film bearing assembly and the heat exchangers (cooler) are submerged in an oil bath (thrust tub) for lubrication and heat transfer. Cooling water (river water) is supplied through gravity flow through the coolers. Two unique types of coolers will be purchased. Nine (9) main unit coolers consist of two semicircular sections where cooling water flows through rows of finned tubes that are supported by a steel frame. The government does not have any detailed drawings for these coolers. As such, the new coolers will have to be reverse engineered, and a drawings generated and approved by the government. The finned tubes are a double tube design. The outer tube will be made from copper and will have integral, helical fins that are extruded. The inner tube will be made from 90/10 copper nickel and will be mechanically expanded into the outer tube. The tube dimensions including inner diameter, wall thickness, fin density, fin thickness, and fin outer diameter will all be identical to the existing coolers. The coolers are capped on the ends with water boxes. The water boxes act as a plenum, or header, to distribute water to the finned tubes. The supply and return piping is attached to the water boxes. The tube sheets are a plate that holds the finned tube array in place. The ends of the finned tubes are expanded into the tube sheets for a secure, mechanical connection. The tube sheets also provide a means to connect the finned tubes to the water boxes. The tube sheets will be made from naval brass. The cooler frames support the finned tube array as well as secure the coolers to the thrust tub. The frames will be made from carbon steel. Three (3) station service unit coolers will have informational drawings provided, from which shop drawing will be generated and approved by the government. The station service unit thrust bearing oil coolers consist of two sections of coiled 90/10 copper/nickel tubes that meet the requirements of ASME B16.15, ASME B16.18, ASME B16.22, and/or ASME B16.29. The coil will have to be fabricated from more than one piece of copper due to the length, but the fabrication would be such to minimize the number of joints. The cooler fittings will also be copper, and the cooler frames will be steel that meets the requirements of ASTM A36/A36M. This solicitation will result in a single firm fixed priced contract. The delivery schedule is defined in the solicitation with final closeout anticipated 275 days following Notice to Proceed. One contract will be awarded to a single contractor. This is a Total Small Business Set Aside, using commercial item evaluation criteria. The following is the list of all items to be purchased: Nine (9) main unit thrust bearing oil coolers Three (3) station service unit thrust bearing oil coolers The NAICS code for this work is 332410 with a size standard of 750 employees. The PSC code is 4420. Should you have any questions, feel free to contact the buyer listed on this announcement. For firms who have questions regarding the Small Business Program, The Small Business Deputy for Portland District is Carol McIntyre. Carol is available by calling (503) 808-4602 or via email at carol.a.mcintyre@usace.army.mil.