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, induced 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 (AT & UT): One (1) year from start-up, not to exceed eighteen (18) months from
        shipment on the unit.
    C. Unit (USS): Five (5) year comprehensive warranty against materials and
        workmanship for complete 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 complying with ASTM A 653/A 653M and having
        G-235 designation.
    B. Optional Type 304 and/or 316 Stainless Steel as specified.
2.3 INDUCED-DRAFT, COUNTERFLOW COOLING TOWERS
    A. Description: Factory assembled and tested, induced draft counterflow cooling tower
        complete with fill, fan, louvers, accessories, and rigging supports.
    B. Cooling Tower Characteristics and Capacities: Refer to the Cooling Tower schedule.
    C. Fan(s):
        1. Type and Material (AT & USS): Axial propeller, individually adjustable wide chord
            blade extruded aluminum installed in a closely fitted cowl with venturi air inlet for
            maximum efficiency, covered with a heavy gauge hot dipped Galvanized (AT) or
            Stainless Steel (USS) fan guard.
        2. Type and Material(UT): Axial propeller, one piece heavy duty FRP hub and blade
            construction. Galvanized steel closely fitted fan cowl with venturi air inlet for
            maximum
            fan efficiency, covered with a heavy gauge hot dip galvanized steel fan guard.
            (Optional Type 304 stainless steel)
        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: Galvanized Steel (AT/UT - Type 304 Stainless Steel
        Optional) or Type 316 Stainless Steel (USS):
        1. Removable stainless-steel strainer with openings smaller than nozzle orifices.
        2. Joints: Bolted and sealed watertight or welded.
        3. Overflow, makeup and side drain connections
        4. Flume plate between cells (for multiple-cell units) or Equalizer connection
            (for multiple-cooling-tower system).
    G. Casing: Galvanized Steel (AT/UT) or Type 304 Stainless Steel (USS -
        Type 316 Stainless Steel Optional):
        1. Casing panels shall totally encase the fill media to protect the fill from damage
            due to direct atmospheric contact.
        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 130ºF; 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. Air Inlet Louver Screens: Formed PVC mounted in G-235 galvanized (or Type
        316 stainless) steel frames for easy removal; designed "Sight Tight" to completely
        block direct sunlight from entering and water from splashing out of the cooling tower.
    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 15 Section "Motors".
    B. Enclosure Type: TEAO or TEFC
    C. Motor Speed: Single Speed (Option: VFD Duty, 2-speed)
    D. Direct Drive (AT/USS 14-64 through 14-912 ONLY): The fan drive shall be mounted
        on the motor in a direct drive configuration.
    E. Drive: Power Band Belt designed for 150% of the motor nameplate HP.
        1. Belt: Mutli-groove, solid back V-belt type neoprene reinforced with polyester cord.
        2. Sheaves: Aluminum alloy if located inside the airstream.
        3. Bearings: Heavy duty, self-aligning pillow block bearings with lubrication lines
            extended to side access door. Minimum L10 life for bearings shall be 75,000
            hours. Provide extended grease lines and fittings.
        4. Vibration Cutout Switch: Mechanical switch to de- energize fan motors if
            excessive vibration in NEMA 4 enclosure.
2.5 MAINTENANCE ACCESS
    A. Internal Working / Service Platforms: Provide a complete internal working platform
        and ladder system for service of all drive components. A suitable working platform
        may be constructed of the fill media for counterflow cooling towers. If a crossflow
        tower is used, provide an internal walkway with ladder and elevated working platform
        to allow for service and maintenance to motor and drive assembly.
    B. Handrails/Grabrails: Galvanized steel pipe complying with 29 CFR 1910.23. If
        access to fan deck is required, supply a perimeter handrail with ladder from
        grade to fan deck.
    C. Ladders: Aluminum, sloped "ships type" with grabrail or vertical complying
        with 29 CFR 1910.27.