July 22, 1994

Contract \# TW0592

**SPECIAL SPECIFICATION**

**SECTION 15711**

**[FACTORY-FABRICATED COOLING TOWER]{.underline}**

[Page]{.underline}

**[PART 1 - GENERAL]{.underline}**

1.01 Description. 2

1.02Related Work. 2

1.03Quality Assurance. 2

1.04References. 3

1.05Submittals. 3

1.06 Delivery, Storage, and Handling. 4

**[PART 2 - PRODUCTS]{.underline}**

2.01Acceptable Manufacturers.. 5

2.02 Induced-Draft, Crossflow Cooling Towers. 5

2.03 Motors. 6

**[PART 3 - EXECUTION]{.underline}**

3.01 Inspection. 8

3.02 Installation/Application/Erection. 8

3.03 Field Quality Control.. 9

3.04 Adjusting and Cleaning.. 9

3.05 Commissioning.. 9

3.06 Demonstration. 9

**SPECIAL SPECIFICATION**

**SECTION 15711**

**[FACTORY-FABRICATED COOLING TOWER]{.underline}**

**[PART 1 - GENERAL]{.underline}**

**1.01 [DESCRIPTION]{.underline}**

> A. This Section includes a factory-fabricated, induced-draft,
> crossflow cooling tower.

**1.02 [RELATED WORK]{.underline}**

> A. Section 01300
>
> B. Section 15010
>
> C. Section 15051
>
> D. Section 15200
>
> E. Section 15250
>
> F. Section 15995
>
> G. Condenser Water Treatment System by Sandia National Laboratory
> (SNL)

**1.03 [QUALITY ASSURANCE]{.underline}**

> A. Certify cooling tower\'s thermal performance according to Cooling
> Tower Institute (CTI) Standard 201.
>
> B. Provide electric motors and electrical components required as part
> of factory-fabricated cooling towers that comply with applicable
> National Electrical Manufacturers Association (NEMA) Standards.
>
> C. Install cooling towers according to National Fire Protection
> Association (NFPA) 70 \"National Electrical Code.\"

**1.04 [REFERENCES]{.underline}**

> A. American Society of Heating, Refrigerating, and Air-Conditioning
> Engineers (ASHRAE) 1991 Heating, Ventilating, and Air-Conditioning
> (HVAC) Applications Handbook
>
> B. American Society for Testing and Materials (ASTM) E84
>
> C. ASTM A525
>
> D. Code of Federal Regulations (CFR) Volume 10, Part 1910.23
>
> E. CFR Volume 10, Part 1910.27
>
> F. CTI Standard 201
>
> G. NEMA Standards
>
> H. NEMA MG-1, Motors and Generators
>
> I. NFPA 70, National Electrical Code

**1.05 [SUBMITTALS]{.underline}**

> A. Make submittals according to this Section, Section 15010, and
> Section 01300.
>
> B. Submit product data including rated capacities, pressure drop, fan
> performance data, weights (shipping, installed, and operating),
> installation instructions, startup instructions, and rating curves
> with selected points clearly indicated.
>
> C. Submit shop drawings indicating dimensions, weight loadings, weight
> distribution, and clearances required around and between construction
> elements such as beams, columns, and walls.
>
> D. Submit wiring diagrams for power supply wiring to cooling towers
> and ladder-type wiring diagrams for interlock and control wiring.
> Clearly differentiate between factory-installed and field-installed
> wiring.
>
> E. Submit maintenance data for each cooling tower. Include parts lists
> for tower fill, water distribution system, fans, bearings, fan drives,
> controls, basin heaters, and all accessories.
>
> F. Submit certified performance curves plotting leaving-water
> temperature (LWT) against wet-bulb temperature (WBT).

G. Submit calculations for the anchorage of the support beams to the
slab.

> A. See Section 15010.

**[PART 2 - PRODUCTS]{.underline}**

**2.01 [ACCEPTABLE MANUFACTURERS]{.underline}**

> A. Provide cooling towers manufactured by one of the following:
>
> 1\. Induced-Draft, Crossflow Cooling Towers:
>
> a\. Baltimore Aircoil Company.
>
> b\. The Marley Cooling Tower Company.

**2.02 [INDUCED-DRAFT, CROSSFLOW COOLING TOWERS]{.underline}**

> A. Description: Induced-draft, crossflow cooling tower that is factory
> fabricated and factory assembled using manufacturer\'s standard
> design, materials, and construction according to published product
> information and these specifications.
>
> B. Fan Description: Propeller fan.
>
> 1\. Fan Blade: Cast aluminum with fixed pitch.
>
> 2\. Fan Drive: Belt drive.
>
> 3\. Fan Bearings: Self-aligning ball bearings or bronze sleeve
> bearings.
>
> 4\. Fan Motor: Totally enclosed, air-over.
>
> 5\. Motor Speed: Single speed.
>
> C. Hot-Water Distribution System: For even distribution of water over
> fill material.
>
> 1\. High density polyethylene basin, gravity-feed nozzles, and basin
> cover.
>
> 2\. Single water inlet connection complete with a pre-strainer
> assembly and means to balance flow rates to the distribution basins.
>
> D. Hot-Water Basin Control Valves: For balancing flow to each
> distribution basin and for shutting off during servicing.
>
> 1\. Valve Type: Butterfly or globe valves.
>
> E. Casing: Hot-dipped galvanized steel with polymer coating or
> galvanized steel conforming to ASTM A 525 with Coating Designation
> G 210.
>
> F. Collecting Basin: Galvanized steel conforming to ASTM A 525, with
> Coating Designation G 210, or hot-dipped galvanized steel with polymer
> coating.
>
> G. Fill Material: Formed PVC, resistant to rot, decay, and biological
> attack with a maximum flame-spread rating of 5 per ASTM E 84 and
> fabricated, formed, and installed by the manufacturer to ensure that
> water breaks up into droplets.
>
> H. Drift Eliminator Material: Formed PVC resistant to rot, decay, and
> biological attack with a maximum flame-spread rating of 5 per ASTM
> E 84.
>
> I. Louver Material: Fiber-glass-reinforced plastic.
>
> J. Water Level Control: Manufacturer\'s standard mechanical make-up
> water valve, and a plastic or bronze float with an adjustable linkage.
>
> K. Basin Heaters: Of sufficient size to maintain basin water
> temperature at 40 degrees (deg.) Fahrenheit (F) (4 deg. Celsius \[C\])
> when ambient temperature is 0 deg. F (minus 18 deg. C) and wind
> velocity is 10 mph.
>
> L. Heater Type: Electric immersion heaters.
>
> 1\. Thermostat and Low-Water Cutout Switch: Enclosed in weatherproof
> housing suitable for field wiring.
>
> M. Handrails: Galvanized-steel pipe rails that comply with
> requirements of 29 CFR 1910.23 (OSHA).
>
> N. Ladders or Internal Walkways: Galvanized-steel pipe rails that
> comply with requirements of 29 CFR 1910.27 (OSHA).
>
> O. Safety Cage: Galvanized-steel pipe rails that comply with
> requirements of 29 CFR 1910.27 (OSHA).
>
> P. Lifting Devices: Provide lifting devices at the base for rigging.
>
> Q. See the Drawing Schedule for additional information.

**2.03 [MOTORS]{.underline}**

> A. General
>
> 1\. Apply requirements below to motors covered by this Section except
> as otherwise indicated.
>
> 2\. Motors 1 horsepower (hp) and Larger: Polyphase.
>
> 3\. Frequency Rating: 60 Hz.
>
> 4\. Voltage Rating: Determined by voltage of circuit to which motor is
> connected for the following motor voltage ratings (utilization
> voltages):
>
> a\. Motors 1 hp and larger: 480 V circuit, 460 V - motor rating.
>
> 5\. Service factors indicated for motors are minimum values and apply
> at frequency and utilization voltage at which motor is connected.
> Provide motors which will not operate in service factor range when
> supply voltage is within 10 percent of motor voltage rating.
>
> 6\. Capacity: Minimum size as indicated. If not indicated, sufficient
> to start and operate connected loads at designated speeds in indicated
> environment, and with indicated operating sequence, without exceeding
> nameplate ratings. Provide motors rated for continuous duty at 100
> percent of rated capacity.
>
> 7\. Temperature Rise: Based on 40 degrees centigrade ambient except as
> otherwise indicated.
>
> 8\. Motor Speed: Single.
>
> B. Polyphase Motors
>
> 1\. Squirrel-cage, induction-type, general-purpose conforming to the
> following requirements except as otherwise indicated.
>
> 2\. NEMA Design Letter Designation: \"B,\" unless specifically
> designated \"C\" for high starting torque.
>
> 3\. Energy Efficient Motors: Nominal efficiency equal to or greater
> than that stated in NEMA MG 1, table 12-6C for that type and rating of
> motor.
>
> 4\. Internal Thermal Overload Protection For Motors: Protection
> automatically opens control circuit arranged for external connection.
> Protection operates when winding temperature exceeds safe value
> calibrated to the temperature rating of the motor insulation.
>
> 5\. Bearings: Double-shielded, pre-lubricated ball bearings suitable
> for radial and thrust loading of the application, unless noted
> otherwise.

**[PART 3 - EXECUTION]{.underline}**

**3.01 [INSPECTION]{.underline}**

> A. Inspect proposed route of moving cooling towers into place and
> verify that it is free of interferences.
>
> B. Inspect elements and surfaces intended to support cooling tower.
>
> C. Verify piping rough-in locations.
>
> D. Verify suitability of branch circuit wiring.
>
> E. Verify that each cooling tower conforms to regulatory and
> specification requirements.
>
> F. Do not proceed until any unsatisfactory conditions have been
> corrected.

**3.02 [INSTALLATION/APPLICATION/ERECTION]{.underline}**

> A. Install cooling towers according to equipment manufacturer\'s
> written instructions.
>
> B. Install cooling towers plumb, level, and anchor.
>
> C. Maintain manufacturer\'s recommended clearances for servicing and
> maintenance.
>
> D. Piping Connections: Maintain clearances for cooling tower service
> and maintenance.
>
> E. Install flanged or union connections to cooling tower.
>
> F. Pitch piping down to drain into sump.
>
> G. Install shutoff/balancing valves at cooling tower inlet connections
> when not provided as part of the cooling tower assembly.
>
> H. Provide shutoff valves at cooling tower outlets.
>
> I. Connect overflow drain and bleed lines to sanitary sewage system.
>
> J. Electrical Wiring: Install electrical devices furnished by
> manufacturer but not specified to be factory mounted, such as remote
> electronic water level controller, tower control panel, and remote
> basin water-heater control panel. Furnish copy of manufacturer\'s
> wiring diagram submittal to Electrical Installer.
>
> K. Cooling tower vendor shall provide W12 support beams and anchors to
> attach the cooling tower to the beams and the beams to a concrete
> slab. The anchorage shall be designed for lateral and overturning
> seismic loads. The lateral seismic load shall be equal to the weight
> of the cooling tower multiplied by 0.41. Adhesive anchors shall be
> used to anchor the support beams to the slab. Expansion anchors shall
> not be used.

**3.03 [FIELD QUALITY CONTROL]{.underline}**

> A. If CTI certification is unavailable then cooling towers shall be
> field tested according to CTI\'s standard field-testing method.
>
> B. Manufacturer\'s Field Service: Provide services of a
> factory-authorized service representative to supervise component field
> assembly and cooling tower installation, including piping and
> electrical connections. Report results in writing.

**3.04 [ADJUSTING AND CLEANING]{.underline}**

> A. Balance condenser water flow to each tower inlet.
>
> B. Adjust water level control for proper operating level.
>
> C. Clean towers using materials and methods recommended by
> manufacturers.
>
> D. Clean finishes to remove dust and dirt.
>
> E. Touch up scratches in unfinished surfaces to restore corrosion
> resistance.
>
> F. Touch up scratches in finished surfaces to restore finish.

**3.05 [COMMISSIONING]{.underline}**

> A. Provide labor, material, equipment, etc., required to facilitate
> the commissioning process. Perform form tests and verification
> procedures required by the commissioning process when requested by the
> Commissioning Authority and directed by the General Contractor. See
> Section 15995.

**3.06 [DEMONSTRATION]{.underline}**

> A. See Section 15995.
>
> END OF SECTION