SECTION 15712

INDUCED DRAFT COOLING TOWER

PART 1 GENERAL

SECTION INCLUDES

Cooling tower.

Controls.

Ladder and handrails.

RELATED SECTIONS

Section 15170 - Motors.

Section 15242 - Vibration Isolation.

Section 15510 - Hydronic Piping.

Section 15540 - HVAC Pumps.

Section 15681 - Reciprocating Water Chillers.

Section 15684 - Centrifugal Water Chillers.

Section 15686 - Absorption Water Chillers.

Section 15952 - Controls and Instrumentation.

Section 16180 - Equipment Wiring Systems.

REFERENCES

ANSI/AFBMA 9 - Load Rating and Fatigue Life for Ball Bearings.

ANSI/AFBMA 11 - Load Rating and Fatigue Life for Roller Bearings.

ASME PTC-23 - Atmospheric Water-Cooling Equipment.

Cooling Tower Institute (CTI) ATC-105 - Acceptance Test Code for Water Cooling Towers.

Cooling Tower Institute (CTI) - Certification Standard STD-201.

NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum).

SUBMITTALS

Submit shop drawings under provisions of Section [01300.]

[01340.]

Submit shop drawings indicating suggested structural steel supports including dimensions, sizes, and locations for mounting bolt holes.

Submit product data under provisions of Section [01300.] [01340.]

Submit product data indicating rated capacities, dimensions, weights and point loadings, accessories, required clearances, electrical requirements and wiring diagrams, and location and size of field connections. Submit schematic indicating capacity controls.

Certify performance, based on [CTI ATC-105] [CTI STD-201] [or] [ASME PTC-23], and submit performance curve plotting leaving water temperature against wet bulb temperature.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

OPERATION AND MAINTENANCE DATA

Submit operation data under provisions of Section [01700.] [01730.]

Include start-up instructions, maintenance data, parts lists, controls, and accessories.

Submit maintenance data under provisions of Section [01700.] [01730.]

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Factory assemble entire unit. For shipping, disassemble into as large as practical sub-assemblies so that minimum amount of field work is required for re-assembly.

Store and protect products under provisions of Section [01600.] [01620.]

Comply with manufacturer's installation instructions for rigging, unloading, and transporting units.

WARRANTY

Provide [five] [_____] year warranty under provisions of Section [01700.] [01740].

Warranty: Include coverage for [cooling tower package.] [fan drive.] [motor.] [labor.] [and] [materials.] [only].

EXTRA MATERIALS

Submit maintenance materials under provisions of Section [01700.] [01750.]

Provide one set of matched fan belts, three spray nozzles for each cell, one gasket for each access door, one valve seat for each make-up or control valve under provisions of Section [01700.] [01750.]

PART 2 PRODUCTS

MANUFACTURERS

[__________________________________] Product [__________.]

[__________________________________] Product [__________.]

[__________________________________] Product [__________.]

Substitutions: Under provisions of Section [01600.] [01630.]

MANUFACTURED UNITS

Provide units for outdoor use, factory assembled, sectional, crossflow, vertical discharge, induced draft type, with sump, fan, surface sections, drift eliminators, and motor.

Provide [_____] cooling towers having capacity to cool [_____] gpm ([_____] L/sec) of water from [_____] degrees F ([_____] degrees C) to [_____] degrees F ([_____] degrees C), with [_____] degrees F ([______] degrees C) entering air WB temperature. Design to operate against [_____] inch wg ([_____] Pa) external static pressure with [_____] motors at [_____] hp ([_____] W).

COMPONENTS

Framework and Casing: [Pressure treated fir framework with casing of] [0.5 inch (13 mm) thick pressure treated fir plywood.] [corrugated glass reinforced polyester with vertical corrugations and lapped joints and corner rolls.] [or] [Galvanized steel with sheets installed vertically with waterproof flanges.]

Louvers: [Corrugated glass reinforced polyester] [or] [Formed galvanized steel, sight tight] spaced to minimize air resistance and splash out.

Fan: Multi blade, cast aluminum [fixed] [adjustable] pitch, axial type with [geared, right angle drive and drive shaft equipped with non-lubricated flexible couplings] [or] [one piece, multi-grooved neoprene/polyester belt drive], bearings with ANSI/AFBMA 9 or ANSI/AFBMA 11 L-10 life expectancy of 30,000 hours, with extended grease fittings.

Motor: [Single] [Two] speed [(1800/900 rpm)] [totally enclosed air over (TEAO) type with special moisture protection,] mounted on welded steel frame in fan deck. [Refer to Section 15170.]

Belt Drive: Designed for minimum 150 percent motor nameplate power.

Fan Cylinder: One piece, [welded steel, hot dipped galvanized] [Glass reinforced polyester] fan assembly.

Fan Guard: One piece, welded steel rod and wire guard, hot dipped galvanized after fabrication.

Access: Large access doors at both ends of tower to eliminators and air plenum.

Safety: Safety railings, and ladder [with safety cage] from [grade] [roof] to fan deck.

Distribution Basin: Open, gravity type distribution basin utilizing weirs and plastic metering orifices[.] [,with flow control valves.].

Fill: Vertical sheets of polyvinyl chloride plastic hung from stainless steel supports or redwood or fir splash bars supported on glass reinforced polyester grid.

Drift Eliminators: Two or three pass polyvinyl chloride plastic, neoprene coated asbestos, or hot dipped galvanized steel to limit drift loss to [0.7] [0.2] percent of total water circulated.

Collection Basin: Self cleaning [pressure treated fir and redwood] [or] [steel] with depressed center section, designed to support tower, with cleanout and drain fitting, 8 gage (_____mm), 1/4 inch (7 mm) mesh strainer, side outlet sump, overflow.

Float Valves: Brass or bronze [balanced piston type] make-up valve with plastic or copper float.

Hardware: Nuts, bolts, and washers shall be galvanized steel. 0.25 inch (7 mm) and larger nuts, bolts, washers, and nails shall be stainless steel. [Assemble with phenolic epoxy coated, cadmium plated washerhead fasteners.]

Finish: Steel components shall be G210 hot dipped galvanized steel with edges protected with zinc rich compound. [Finish with zinc chromatized aluminum paint.] [Finish with electrostatically sprayed, thermosetting, polymer.]

ACCESSORIES

Electric Immmersion Heaters: In collection basin; suitable to maintain temperature of water in basin at 42 degrees F (5 degrees C) when outside temperature is 0 degrees F (-17 degrees C) and wind velocity is 15 mph (25 kph); immersion thermostat and float control to operate heaters on low temperature when basin is filled.

Electric Temperature Controller: In collection basin; with sensor to cycle fans.

Time Delay Relay: Limits fan motor starts to not more than six per hour.

Capacity Control: For stable operation down to 10 percent of rated cooling at specified wet bulb temperature.

Manually Selected Summer/Winter Switch: Time delay relays limit fan motor start-up in reverse rotation during de-ice of inlet louvers; control fan off to allow fan to stop and run (in reverse) for preset time.

Vibration Cut-Out Switch: De-energize fan motors upon excessive vibration.

Control Panel: NEMA 250 [Type 3 - Dripproof] [Type 3R -Weather Resistant], containing:

Unfused disconnect switch.

Combination motor controllers.

Electric alternator.

Interlocks and relays.

Pilot lights and push buttons.

PART 3 EXECUTION

INSTALLATION

Install in accordance with manufacturer's instructions.

Install tower on structural steel beams as instructed by manufacturer.

Elevate tower to maintain maximum positive suction head on condenser water pump.

Install tower on vibration isolators. Refer to Section 15242.

Connect condenser water piping with flanged connections to tower. Pitch condenser water supply to tower and condenser water suction away from tower. Refer to Section 15510.

Connect make-up water piping with flanged or union connections to tower. Pitch to tower. Refer to Section 15410.

Connect overflow, bleed, and drain, to [floor drain.] [storm sewer.] [__________.]

FIELD QUALITY CONTROL

Filed [inspection and] testing will be performed under provisions of Section [01400.] [01410.]

Test under actual operating conditions [in accordance with CTI ATC-105] and verify specified performance.

MANUFACTURER'S FIELD SERVICES

Prepare and start systems under provisions of Section [01600.] [01650.]

Inspect tower after installation and submit report prior to start-up, verifying installation is in accordance with specifications and manufacturer's recommendations.

Supervise rigging, hoisting, and installation; include [_____] eight hour days per tower.

Allow [_____] eight hour days per tower for start-up and instruction of Owners operating personnel.

SCHEDULE

Drawing_Code CT-1 CT-2 CT-3 Location

Manufacturer

Model Number

Cooling Capacity

Water Flow Rate

Entering Water Temperature

Leaving Water Temperature

Entering Air WB Temperature

External Static Pressure

Number of Fan Motors

Motor Size

Heaters No. and Type

END OF SECTION