SECTION 23 65 00 - FACTORY-FABRICATED COOLING TOWERS
PART 1 - GENERAL
1.1 RELATED DOCUMENTS
A. Drawings and general provisions of the Contract, including General and
Supplementary Conditions and Division 1 Specification Sections, apply to
this section.
1.2 SUMMARY:
A. This Section includes factory assembled and tested, open circuit, forced draft
counterflow cooling tower.
1.3 SUBMITTALS
A. General. Submit the following:
1. Certified drawings of the cooling tower, sound data, recommended steel support
indicating weight loadings, wiring diagrams, installation instructions, operation
and maintenance instructions, and thermal performance guarantee by the
manufacturer.
1.4 QUALITY ASSURANCE
A. Verification of Performance:
1. Test and certify cooling tower thermal performance according to CTI
Standard 201.
2.Test and certify cooling tower sound performance according to CTI ATC-128.
B. Meet or Exceed energy efficiency per ASHRAE 90.1.
1.5 WARRANTY
A. Motor/Drive System: Five (5) year comprehensive warranty against materials and
workmanship including motor, fan, bearings, mechanical support, sheaves,
bushings and belt.
B. Unit: One (1) year from start-up, not to exceed eighteen (18) months from
shipment on the unit.
PART 2 - PRODUCTS
2.1 MANUFACTURERS
A. Manufactures: Subject to compliance with requirements, provide cooling towers
manufactured by one of the following:
1. EVAPCO, Inc.
2. Approved Substitute
2.2 MATERIALS
A. Galvanized Sheet Steel casing and fan housing complying with ASTM A 653/A
653M and having G-235 designation and Type 304 Stainless Steel basin.
B. Optional Type 304 and/or 316 Stainless Steel as specified.
2.3 FORCED-DRAFT, COUNTERFLOW COOLING TOWERS
A. Description: Factory assembled and tested, forced draft counterflow cooling tower
complete with fill, fan(s), fan screens, accessories, and rigging supports.
B. Cooling Tower Characteristics and Capacities: Refer to the Cooling Tower schedule.
C. Fan(s):
1. Type and Material: forward curved, centrifugal of hot-dipped galvanized
construction. The fans shall be factory installed, and statically and
dynamically balanced for vibration free operation.
2. Fan Housing: The complete drive system, including the electric motor, belts,
bearings, fan, and drives shall be completely enclosed in a protective
housing which covers the drive system and provides sound reduction.
3. Maximum sound pressure level of _____dB(A) measured at 5 feet above the fan
discharge during full speed operation in accordance with CTI Standard ATC-128.
D. Water Distribution System: Non-corrosive materials.
1. Evenly distribute of water over fill material with pressurized spray tree.
a. Pipes: Schedule 40 PVC, Non-corrosive Materials
b. Nozzles: Non-clogging, ABS Plastic, threaded into branch piping.
2. Maximum pressure at inlet shall be ____ psig.
E. IBC Compliance: The unit structure shall be designed, analyzed, and constructed
in accordance with the latest edition of the International Building Code (IBC)
Regulations for seismic loads up to _____ g and wind loads up to __ psf.
F. Collection Basin Material: Type 304 Stainless Steel for long life and durability
(Optional Stainless Steel Water Touch Basin, Water Touch Unit, and
All Stainless Steel Unit):
1. Removable stainless-steel strainer with openings smaller than nozzle orifices.
2. Joints: Bolted and sealed watertight.
3. Overflow, Makeup and Drain connections: Type 304 Stainless Steel (MPT).
4. Outlet Connection: Type 304 Beveled for weld and grooved for mechanical
coupling.
G. Casing: Heavy Gauge G-235 Galvanized Steel or Type 304 Stainless Steel
(Optional):
1. Casing panels shall totally encase the fill media to protect the fill from damage
due to direct atmospheric exposure. All galvanized steel panel edges
shall be coated with a 95% pure zinc compound during fabrication.
2. Fasteners: Corrosion resistance equal to or better than materials being fastened.
3. Joints: Sealed watertight.
4. Welded Connections: Continuous and watertight
H. Fill Media: PVC; resistant to rot, decay and biological attack; formed, crossfluted
bonded together for strength and durability in block format for easy removal and
replacement; suitable for use as a working surface; self extinguishing with flame
spread rating of 5 per ASTM E84-81a; able to withstand continuous operating
temperature of 130°F; and fabricated, formed and installed by the manufacturer
to ensure water breaks up into droplets.
I. Drift Eliminators: Same material as Fill. 0.001% drift rate.
J. Protective Air Inlet Screens: Galvanized Steel
K. Water Level Control: Brass mechanical makeup water valve and plastic float
with an adjustable linkage.
2.4 MOTORS AND DRIVES
A. General requirements for motors are specified in Division 23 Section "Motors".
B. Enclosure Type: TEFC
C. Motor Speed: Single Speed (Option: VFD Duty, 2-speed)
D. Drive: Power Band Belt designed for 150% of the motor nameplate HP.
1. Belt: V-belt type.
2. Sheaves: Aluminum alloy, taper lock design.
3. Bearings: Heavy duty, self-aligning bearings with extended grease lines
and fittings.
4. Fan Shaft: Solid steel shaft with forged bearing journals.
5. Vibration Cutout Switch: Mechanical switch to de- energize fan motors if
excessive vibration in NEMA 4 enclosure.
2.5 MAINTENANCE ACCESS
A. Access Door: A circular access door shall be located above the basin to allow for
easy access to the pan interior.
B. Ladders: Aluminum, vertical complying with 29 CFR 1910.27.
2.6 SOUND ATTENUATION
A. Inlet Attenuation: Self supporting, materials to be same as fan section. Baffled
panels shall change the path of air entry and capture radiated noise.
External belt adjustment and lubrication points shall be provided.
B. Discharge Attenuation: Straight sided discharge hood with insulated baffles to
reduce the overall sound level of the discharge air. A large access
panel to allow access to the water distribution system and drift
eliminators shall be provided.
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