| Furnish and install as shown on the plans an EVAPCO Model __________ induced draft counterflow cooling tower. Each unit shall have the capacity to cool __________ GPM (liters/sec) of water from __________ °F (ºC) to __________ °F (ºC) with a __________ °F (ºC) entering wet bulb temperature.
Pan and Casing
The pan and casing shall be constructed of heavy gauge G-235 (Z600-Europe) hot-dip galvanized steel for long life and durability. Standard pan accessories shall include overflow, drain, anti-vortexing hood, Type 304 stainless steel strainers, and brass make-up valve with plastic float.
Fan Motor(s)
_________ HP (kW) totally enclosed motors with 1.15 service factor shall be furnished suitable for service on __________ volts, __________ hertz, and __________ phase.
Drive
The fan drive shall be mounted on the motor in a direct drive configuration.
Axial Propeller Fans
Fans shall be heavy duty axial propeller type statically balanced. The fans shall be constructed of aluminum alloy blades installed in a closely fitted cowl with venturi air inlet. Fan cowl shall be covered with a galvanized steel fan guard.
Fan Drive Warranty
Cooling tower fan drive components shall be covered by a three year manufacturer’s warranty plan. Drive components protected by this warranty shall include the fan and fan motors.
Fill
The cooling tower fill shall be PVC of cross-fluted design for optimum heat transfer 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 and biological attack. The fill shall be able to withstand a water temperature of 130ºF (54,4 ºC)
Louvers
The louvers shall be constructed of PVC and shall be easily removable for access to the basin for maintenance. The louvers shall have a minimum of two changes in air direction to prevent splashout and block direct sunlight.
Water Distribution System
The spray header shall be constructed of Schedule 40 PVC pipe for corrosion resistance and shall have a threaded connection to attach the external piping. The spray header shall be removable for cleaning purposes. 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 to eliminate clogging. The nozzles shall be threaded into the distribution piping to assure positive positioning.
Eliminators
The eliminators shall be constructed entirely of inert PVC in easily handled sections. The eliminator design shall incorporate three changes in air direction to assure complete removal of all entrained moisture from the discharge air stream. Maximum drift rate shall be 0.001% or less of the circulating water rate.
Finish
All pan and casing materials shall be constructed of G-235 heavy gauge mill hot-dip galvanized steel. During fabrication, all panel edges shall be coated with a 95% pure zinc-rich compound.
Optional Materials of Construction
• Type 304 Stainless Steel Cold Water Basin
Available on Models ICT 3-63 to 4-912
The entire cold water basin area shall be constructed of Type 304 stainless steel. Pan accessories shall include overflow, drain, Type 304 stainless steel anti-vortexing hood and strainer assembly, and brass make-up valve with plastic float.
• Stainless Steel Basin with Fiberglass Casing
Available on Models ICT 4-54 to 4-912
Fan support, interior steel components, and pan shall be Type 304 stainless steel. The casing shall be constructed of UV resistant non-corrosive Fiberglass-Reinforced Polyester (FRP). The fan cowl shall also be constructed of FRP. All FRP components shall be of high grade isophthalic polyester resin and gel coated. FRP shall also be UV resistant and color impregnated.
|
