Furnish and install as shown on the plans an EVAPCO Model _____ blow-through cooling tower. Each unit shall have the capacity to cool _____ GPM (liters/sec) of water from _____ ºF (ºC) to ______ ºF (ºC) with a _____ ºF (ºC) entering wet bulb temperature. The tower shall operate against _____ w.g. external static pressure. Unit height shall not exceed _____.
Pan and Casing
The pan and casing shall be constructed of G-235 (Z600-Europe)hot-dip galvanized steel for long life and durability. The heat transfer section shall be removable from the pan to provide easy handling and rigging. The pan/fan section shall include fans and drives mounted and aligned at the factory. These items shall be located in the dry entering air stream to provide maximum service life and easy maintenance. Standard pan accessories shall include circular access doors, stainless steel strainers, and brass make-up valve with unsinkable, foam filled plastic float.
Centrifugal Fans/Drives
Fans shall be forwardly curved centrifugal type of hot-dip galvanized construction. The fans shall be factory installed into the fan/pan section, and statically and dynamically balanced for vibration free operation. Fans shall be mounted on either a sold steel shaft or a hollow steel shaft with forged bearing journals. The fan shaft shall be supported be heavy-duty, self-aligning bearings with cast iron housings and lubrication fittings for maintenance. The fan drives shall be V-belt type with taper lock sheaves designed for 150% of the motor nameplate horsepower.
Fan Motor
_____horsepower (kW) T.E.F.C. ball bearing fan motor(s) with 1.15 service factor shall be furnished suitable for outdoor service on _____ volts, _____hertz, and _____phase. Motor(s) shall be mounted on an adjustable base.
Fill
The cooling tower fill shall be PVC (Polyvinyl Chloride) of cross-fluted design for optimum heat transfer and efficiency. The cross-fluted sheets shall be bonded together for strength and durability. The PVC fill shall be self-extinguishing for fire resistance with a flame spread rating of 5 per ASTM E84-81a. It shall also be resistant to rot, decay or biological attack. The fill shall be able to withstand a water temperature of 130ºF (54.4ºC)
Water Distribution System
The spray header and branches shall be constructed of Schedule 40, polyvinyl Chloride (PVC) pipe for corrosion resistance and shall have a steel connection to attach the external piping. The water shall be distributed over the fill by precision molded ABS spray nozzles with large 3/8 by 1 inch (9,5 mm by 25,4 mm) orifice openings and integral sludge ring to eliminate clogging. The internal tower water distribution piping shall be removable for cleaning purposes.
Eliminators
The eliminators shall be constructed entirely of inert polyvinyl chloride (PVC) that has been specially treated to resist ultra violet light. Assembled in easily handled sections, the eliminator blades shall be spaced on 1 inch (25,4 mm) centers and shall incorporate three changes in air direction to assure removal of entrained moisture from the discharge air stream. They shall have a hooked leaving edge to direct the discharge air away from the fans to minimize recirculation.
Finish
All pan and casing materials shall be constructed of G-235 (Z600-Europe) heavy gauge mill hot-dip galvanized steel for maximized protection against corrosion. During fabrication, all panel edges shall be coated with a 95% pure zinc-compound.
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