A. COLD & HOT WATER BASINS: 1. Type 304 welded stainless steel panels and structural members. A removable anti-vortexing hood will be provided to prevent air entrainment. Large area lift out strainers will be provided with perforated openings sized smaller than the water distribution system nozzles. Sloped with depressed section with drain/clean-out connection. Basins with bolted seams or constructed of 301 stainless steel are not acceptable. Hot water basins will be constructed of type 304 welded stainless steel. Polypropylene metering orifices are provided to assure even distribution of water over the wet deck surface. Heavy gauge, Type 304 stainless steel covers are furnished to prevent the accumulation of debris and algae in the hot water distribution basins. 2. Equalizer Connection: An equalizer connection will be built into the cold water basin on the bottom with a pipe diameter appropriate for the design flowrate of the tower. See drawings for connection type. 3. Bypass Connection: A bypass connection will be built into the cold water basin on Face A with a pipe diameter appropriate for the design flowrate of the tower. See drawings for connection type. B. Water Distribution System 1. The hot water distribution basins will be gravity-fed and accessible from the outside of the unit for service or inspection while unit is in operation. Included weir dams will accommodate a flow range of 50% to 100% of the design flow rate. Lift-off distribution covers will be constructed of steel and designed to withstand a 50 psf (244 kg/m2) live load or 200 pound (90.7 kg) concentrated load. C. Casing Panels and Framework: 1. Casing panels and framework will be constructed of G235 galvanized steel. D. Air Inlet Louvers 1. Fiberglass Reinforced Polyester (FRP): Air Inlet louvers will be separate from the fill and removable to provide easy access for inspection of the air/water interface at the louver face. Louvers will prevent water splash out during fan cycling and be constructed of maintenance free, corrosion and UV resistant FRP.
