61--Cooling Tower

Furnish one factory-assembled, induced draft, crossflow cooling tower with vertical air discharge, conforming to the following specifications. The cooling tower design should be based on a Baltimore Aircoil Company Model 31132C-MM. Other manufacturer?s equipment will be considered in accordance with these specifications. Thermal Capacity: The cooling tower(s) shall be warranted by the manufacturer to cool 1000 US GPM of water from 90 ?F to 70 ?F at the average summer-time conditions at the proposed location. The location for the unit will be 8 miles south of Midwest, Wyoming. The average wind and snow loads for the area shall be considered in the design according to ASCE standards. The area of usage is in an oil field in a low seismic risk area. Corrosion Resistant Construction: Unless otherwise noted in this specification, all steel basin panels and structural members shall be constructed of heavy-gauge G-235 (Z700 metric) hot-dip galvanized steel with all edges given a protective coating of zincrich compound. The cooling tower shall be constructed with a sturdy structural frame designed to transmit all wind, seismic and mechanical loads to the equipment anchorage. The frame shall be constructed of heavy-gauge steel angles and channels. Panels can be corrosion and UV-resistant fiberglass reinforced polyester (FRP) to minimize maintenance requirements and prolong equipment life. Type 304 stainless steel casing panels may be used in lieu of FRP panels. All water basins shall be constructed of heavy-gauge steel or hot-dip galvanized steel panels as required and structural members. The basins must be accessible from outside the unit and serviceable during tower operation. Basin shall include a depressed center section with drain/clean-out connection. The basin area under the fill shall be sloped toward the depressed center section to facilitate cleaning. The basin volume shall be adequate to prevent starving the pump. The cooling tower cold water basin shall be provided with electric heater(s) to prevent freezing in low ambient conditions. The heater(s) shall be selected to maintain 40?F (4.44?C) basin water temperatures at -20?F (?C) ambient. The heater(s) shall be 480 V/ 3 phase/ 60 Hz electric and shall be provided with low water cutout and thermostat. A hot water coil shall be factory installed in the depressed section of the cold water basin to prevent freezing during cold water shutdown. The steam coil shall be capable of maintaining 40?F (4.44?C) basin water temperature at a -20?F (-28.89?C) ambient temperature given 90?F water temperature at the coil inletconnection. All basins will be fitted with drain valves for complete draining during extended cold-weather shut down. The tower shall be furnished with a single water inlet connection complete with the means to automatically balance flow rates to the hot water basins. The fan shall be heavy-duty, axial flow with aluminum alloy blades selected to provide optimum cooling tower thermal performance with minimal sound levels. Air shall discharge through a fan cylinder designed for streamlined air entry and minimum tip clearance for maximum fan efficiency. The top of the fan cylinder shall be equipped with a conical, non-sagging removable fan guard. Fan(s) and shaft(s) shall be supported by heavy-duty, self-aligning, greasepackedball bearings with moisture proof seals and integral slinger collars. Fan and motor sheave(s) shall be fabricated from corrosion-resistant materials to minimize maintenance and ensure maximum drive and powerband operating life. Fan motor(s) shall be no larger than 30 hp with 20 hp preferred and 240/480 V 3-phase. Fan motor(s) shall be totally enclosed air over (TEAO), reversible, squirrel cage, ball bearing type designed specifically for cooling tower service. The motor shall be furnished with special moisture protection on windings, shafts and bearings and labeled appropriately for cooling tower duty. Fan motors shall be inverter duty type designed per NEMA Standard MG1, Section IV, Part 31. To maintain the quality of the local environment, the sound pressure levels (dB) from the cooling tower operating at design point fan speed shall not exceed the sound levels for 8-hour exposure. Safety and other shut down features common to cooling towers shall be included for safe operation of the system.