Section 236500
Cooling Towers
	PART 1 GENERAL
1.01	SECTION INCLUDES
A.	Open circuit, induced draft, counterflow cooling towers.
1.02	REFERENCE STANDARDS
A.	ASHRAE 90.1-2019 – Energy Standard for Buildings Except Low-Rise Residential Buildings.
B.	ASTM A123/A123M - Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products 2017.
C.	ASTM A653/A653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process 2018.
D.	ASTM B117 - Standard Practice for Operating Salt Spray (Fog) Apparatus 2018.
E.	ASTM E84 - Standard Test Method for Surface Burning Characteristics of Building Materials 2018b.
F.	ASTM D2794 - Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact).
G.	ABMA STD 9 - Load Ratings and Fatigue Life for Ball Bearings 2015.
H.	ABMA STD 11 - Load Ratings and Fatigue Life for Roller Bearings 2014.
I.	CTI STD-201 OM - Operations Manual for Thermal Performance Certification of Evaporative Heat Rejection Equipment 2017.
J.	CTI STD-201 RS - Performance Rating of Evaporative Heat Rejection Equipment 2017.
K.	ISO 9001 - Quality management systems -- Requirements 2015.
L.	NEMA MG 1 - Motors and Generators 2017.
M.	ASCE/SEI 7 - Minimum Design Loads and Associated Criteria for Buildings and Other Structures.
1.03	SUBMITTALS
A.	Product Data: Provide rated capacities, dimensions, weights and point loadings, accessories, required clearances, electrical requirements and wiring diagrams, and location and size of field connections. 
B.	Shop Drawings: Indicate suggested structural steel supports including dimensions, sizes, and locations for mounting bolt holes.
C.	Manufacturer's Certificate: Certify that cooling tower performance, based on CTI STD-201 meets or exceeds specified requirements and submit performance curve plotting leaving water temperature against wet bulb temperature.
D.	Manufacturer's Instructions: Submit manufacturer's complete installation instructions.
E.	Operation and Maintenance Data: Include start-up instructions, maintenance data, controls, and accessories.
F.	Warranty: Submit manufacturer's warranty and ensure forms have been filled out in Owner's name and registered with manufacturer.
1.04	QUALITY ASSURANCE
A.	Manufacturer Qualifications:  Company specializing in manufacturing the type of products specified in this section, with minimum 20 years of documented experience and ISO 9001 certification.
B.	Installer Qualifications: Company specializing in performing the type of work specified in this section with minimum 20 years of experience and approved by manufacturer.
C.	Product Performance: 
1.	Cooling tower must have a minimum energy rating of [_____] per ASHRAE 90.1, 189 and CA Title 24.
2.	Structural and Seismic Performance: The structure will be designed, tested and certified in accordance with IBC 2009 regulations to meet a minimum unrestricted seismic design SDS = ___ g with an Importance Factor of ___ and wind load of __ psf.  Units not provided with a certificate of IBC 2009 compliance will not be an acceptable alternative.
1.05	DELIVERY, STORAGE, AND HANDLING
A.	Equipment will be factory-assembled, including a cold water basin, heat transfer section, water distribution, fan drive system, and casing panels. For shipping, disassemble into as large as practical sub-assemblies to minimize field work for re-assembly. 
B.	Comply with manufacturer's installation instructions for rigging, unloading, and transporting units.
1.06	WARRANTY
A.	One-year warranty after start-up, or eighteen months from date of shipment, whichever occurs first. Warranty to include coverage for defects in material and workmanship.
B.	Fans, fan shafts, bearings, sheaves, gearboxes, drive shafts, couplings, and mechanical equipment support must be warranted against defects in materials and workmanship for a period of five (5) years or seven (7) years, if motor space heater is properly wired.
	PART 2 PRODUCTS
2.01	MANUFACTURERS
A.	Open Circuit, Induced Draft, Counterflow Cooling Towers:
1.	Basis of Design: Baltimore Aircoil Company; PT2: www.baltimoreaircoil.com #BAC
2.02	MANUFACTURED UNITS
A.	Provide units for outdoor use, factory-assembled, induced draft with vertical discharge, and multi-blade axial fan(s). 
B.	The heat transfer section will be joined to the lower section without the use of a gasket or sealer. The field joint will be self-aligning and require a minimum number of fasteners.
----- ALTERNATE for Knockdown Shipping -----
C.	Provide units suited for outdoor use, induced draft with vertical discharge of air. Units will be shipped disassembled in protective crates. Crates and components must be clearly labeled with part numbers. Assembly of units will be completed onsite. Cold water basins will not have welded seams when shipped knocked down.  
2.03	COMPONENTS
A.	Cold Water Basin:
1.	Heavy-gage galvanized steel:  The cold water basin will be constructed of heavy-gauge G-235 (Z700 metric) hot-dip galvanized steel panels and structural members. Basin will include removable anti-vortexing device to prevent air entrainment, and large area lift out strainers and drain/clean-out connection.
----- ALTERNATE for TriArmor -----
2.	Tri-layer protection system consisting of G-235 galvanized steel, a thermosetting hybrid polymer, and a polyurethane liner factory applied to all submerged surfaces. The polyurethane barrier must seal all factory seams in the basin to ensure a corrosion resistant and watertight construction and will be warranted against leaks and corrosion for five (5) years. Basin will include removable anti-vortexing device to prevent air entrainment, and large-area lift out strainers. A welded Type 316 stainless steel basin is an acceptable alternative. Field applied polyurethane or polyurethane applied directly to galvanized steel will not be accepted. 
----- ALTERNATE for 304 Stainless Steel -----
3.	The cold water basin will be constructed of heavy-gauge 304 stainless steel panels and structural members. All factory seams in the cold water basin will be welded to ensure watertight assembly and welded seams will be warranted against leaks for five (5) years. Basin will include removable anti-vortexing device to prevent air entrainment, and large-area lift out strainers. Basins with bolted seams or constructed of 301 stainless steel are not acceptable.
----- ALTERNATE for 316 Stainless Steel-----
4.	The cold water basin will be constructed of heavy-gauge 316 stainless steel panels and structural members. All factory seams in the cold water basin will be welded to ensure watertight assembly and welded seams will be warranted against leaks for five (5) years. Basin will include removable anti-vortexing device to prevent air entrainment, and large-area lift out strainers. Basins with bolted seams or constructed of 301 or 304 stainless steel are not acceptable.
5.	(Optional) Flume Box: Unit will be equalized with adjacent cell(s) through a factory-supplied flume box connection built into the cold water basin. Hardware, gaskets, and flume will be supplied. Size will be appropriate for the design flowrate of the tower. 
6.	(Optional) Equalizer Connection: An equalizer connection will be built into the cold water basin on the [bottom, side] with a pipe diameter appropriate for the design flowrate of the tower. 
7.	(Optional) Bypass Connection: An bypass connection will be built into the cold water basin on the [bottom, side] with a pipe diameter appropriate for the design flowrate of the tower. 
B.	Casing Panels and Framework:
----- Thermosetting Hybrid Polymer Panels-----
1.	Galvanized steel protected by a thermosetting hybrid polymer. The polymer to consist of G-235 (Z700 metric) hot-dip galvanized steel prepared in a four-step (clean, pre-treat, rinse, and dry) process with an electrostatically applied, thermosetting, hybrid polymer fuse-bonded to the substrate during a thermally activated curing stage and monitored by a 23-step quality assurance program. Other coatings must be submitted to the engineer for pre-approval. Approved equals must have undergone testing, resulting in the following results as a minimum:
a.	When X-scribed to the steel substrate, unit to withstand 6000 hours of 5 percent salt spray per ASTM B117 without blistering, chipping, or loss of adhesion.
b.	When X-scribed to the steel substrate, unit to withstand 6000 hours of exposure to acidic (pH=4.0) and alkaline (pH=11.0) water solutions at 95 degrees F (35 degrees C) without signs of chemical attack.
c.	Unit to withstand impact of 160 in-lbs per ASTM D2794 without fracture or delamination of the polymer layer.
d.	Unit to withstand 6000 hours of ultraviolet radiation equivalent to 120,000 hours of noontime sun exposure without loss of functional properties.
e.	Unit to withstand 200 thermal shock cycles between minus 25 degrees F and 180 degrees F (minus 32 degrees C and 82 degrees C) without loss of adhesion or other deterioration.
f.	Unit to withstand 6000 hours of exposure to 60 psi (42,184 kg/m^2) water jet without signs of wear or erosion.
g.	Type 304 stainless steel may be supplied as an equal to eliminate the need for passivation, minimize maintenance requirements, and prolong equipment life.
----- ALTERNATE for Galvanized Steel Panels-----
2.	Casing panels and framework will be constructed of G235 galvanized steel. All edges given a protective coating of zinc-rich compound. 
----- ALTERNATE for 304 Stainless Steel Panels-----
3.	Casing panels, framework, and fasteners will be constructed of Type 304 stainless steel. Type 301 stainless steel is not an acceptable alternative.
----- ALTERNATE for 316 Stainless Steel Panels-----
4.	Casing panels, framework, and fasteners will be constructed of Type 316 stainless steel. Type 301 or 304 stainless steel is not an acceptable alternative.
C.	Fans:  Multi blade, axial type, with belt drive, bearings with ABMA STD 9 or ABMA STD 11 L-10 life at 80,000 hours.
D.	Motors and Drives:
1.	Motors: Single speed (1800 rpm), premium efficiency, cooling tower duty, and mounted on an interior adjustable base which allows the motor to slide to the exterior of the unit for servicing or removal. Fan motor(s) will be designed per NEMA Standard MG1, Section IV Part 31, Section IV, and Part 31. 
----ALTERNATE for PT2-0412 models only. Delete Belt Drive section-------
2.	Motors: Fan motors will be premium efficient/VFD duty, enclosed air over (TEAO), direct drive, reversible, squirrel cage, ball bearing type designed specifically for cooling tower service. Fan motor(s) will be designed per NEMA Standard MG1, Section IV Part 31, Section IV, and Part 31.
3.	Belt Drive: Designed for minimum 150 percent motor nameplate power. Fan and motor sheave(s) will be fabricated from corrosion-resistant materials to minimize maintenance and ensure maximum drive and powerband operating life. Bearings must have a minimum L-10 life of 80,000 hours per ABMA STD 11. Belt tension must be easily adjusted in the field. 
4.	 (Optional) Extended Grease Fittings: Extended grease lines are supplied that reach from the bearing to fittings on the exterior casing near the access doors. This facilitates easy periodic bearing maintenance without entering the tower. 
E.	Fan Guard: 
1.	Welded steel rod and wire guard, hot dipped galvanized after fabrication.
-----ALTERNATE for Stainless Steel Fan Guard-----
2.	Welded stainless steel rod and wire guard, placed over fan discharge. 
F.	Distribution Section: Polyvinyl chloride piping header and branches with Polypropylene spray nozzles. The headers will have a removable cap facilitating quick header cleanout without removal. The spray nozzles will be held in place by snap-in rubber grommets and the branches should be removable without tools or removal of branch supports, allowing quick removal of individual nozzles or complete branches for cleaning or flushing. Branches that require tools for removal or removal of branch supports will not be accepted.
G.	Fill:  Polyvinyl chloride plastic with flame spread index of 25 or less, when tested in accordance with ASTM E84. The fill will be suitable for use as a working platform and will be provided and performance tested by the cooling tower manufacturer to assure single source responsibility and control of the final product. The fill will be able to withstand a water temperature of 140°F (60.0º C).
H.	Drift Eliminators: Three-pass design made of PVC material.  
I.	Air Inlet Louvers: Louver sections will be individually removable sections. The combined inlet shields will be UV resistant PVC, installed on the air inlet face to minimize air resistance, prevent water splash out, and minimize sunlight exposure to reduce the potential for algae growth in the cold water basin. 
J.	Basin Water Level Control: 
1.	Corrosion resistant PVC make-up valve with plastic float for easy adjustment of operating water level.
----- ALTERNATE for Electric Water Level Controller-----
2.	Electric water level control with NEMA 4 enclosure, solid state controls, LED status light, and stainless steel water level sensing electrodes. Number and position of probes provided to sense the following: high water level, low water level, high water alarm level, low water alarm level, heater safety cutout, and automatic solenoid valve. Include all necessary mounting hardware. 
2.04	ACCESSORIES
A.	(Optional) Electric Immersion Heaters: In pan suitable to maintain temperature of water in pan at 40 degrees F (4.4 degrees C) when outside temperature is 0 degrees F (-17.7 degrees C) [OR -20 degrees F (-28.9 degress C)] and wind velocity is 15 mph (25 kph); immersion thermostat and float control operate heaters on low temperature when the pan is filled. Heaters will be constructed of copper.
B.	(Optional) Basin Sweeper Piping: The cold water basin of the cooling tower will be equipped with PVC sump sweeper piping with plastic eductor nozzles. The piping must be designed specifically for the size and shape of the basin to ensure full agitation. 
C.	(Optional) Fan Cylinder Extension: To extend the height of the tower equal to the surrounding enclosure, the cooling tower will be provided with _____inches (mm) of fan cylinder extension. The fan cylinder extension will match the construction of the fan deck.
D.	(Optional) Mechanical Equipment Removal Davit: The unit will be equipped with a mechanical equipment removal davit. The motor will lower from the mechanical equipment supports down to grade. Davit will attach to the unit without the need for tools. If tools are required for davit installation or removal, provide (1) davit for each motor provided. 
E.	(Optional) Access Packages: See submittal documents for access package requirements. Platforms and ladders must ship assembled from cooling tower manufacturer.
1.	Access Platform: An external steel access platform at the access door of the unit(s) provides access to the spray distribution system or internal plenum. An aluminum ladder and 1-1/4 inch (32 mm) galvanized steel pipe safety railing is included with the platform. This option meets pertinent OSHA standards. Platforms and ladders must ship assembled from cooling tower manufacturer.
2.	External Access – Inclined Ladder:  An inclined ladder will be provided for access to the mechanical plenum.  The ladder will be at a 75° angle extended from the base of the unit to the access door.  All components are designed to meet OSHA standards.
3.	Fill Inspection Panel: The unit will be equipped with a removable access panel in the upper casing to easily inspect and remove the fill bundles. Contractor will be responsible for installing an access panel if one is not provided from the manufacturer.
F.	(Optional) Sound Attenuation: 
1.	Water Silencers: The unit will be equipped with PVC water silencers in the cold water basin to reduce falling water sound emissions.
2.	Discharge Sound Attenuation: The unit will be equipped with straight discharge attenuation with sound absorbing fiberglass acoustical baffles to reduce sound levels from the top of the unit.
	PART 3 EXECUTION
3.01	INSTALLATION
A.	Install in accordance with manufacturer's instructions.
B.	Provide the services of the manufacturer's field representative to supervise rigging, hoisting, and installation, allowing for minimum of one eight-hour day per tower.
C.	Install tower on structural steel beams as instructed by manufacturer.
D.	Connect condenser water piping with flanged connections to tower. Pitch condenser water supply to tower and condenser water suction away from tower. 
E.	Connect make-up water piping to tower. Pitch to tower. 
F.	Connect overflow and drain to floor drain.
3.02	FIELD QUALITY CONTROL
A.	See Section Quality Requirements, for additional requirements 
B.	Provide the services of the manufacturer's field representative to inspect tower after installation and submit report prior to start-up, verifying installation is in accordance with specifications and manufacturer's recommendations.
3.03	SYSTEM STARTUP
A.	Start-up tower in presence of and instruct Owner 's operating personnel.
3.04	SCHEDULES
A.	Cooling Towers
1.	Drawing Code:
2.	Location:
3.	Manufacturer:
4.	Model Number:
5.	Cooling Capacity
a.	Water Flow Rate:
b.	Entering Water Temperature:
c.	Leaving Water Temperature:
6.	Entering Air WB Temperature:
7.	Number of Fan Motors:
8.	Motor Size:
9.	Motor Electrical Characteristics: [_____] Volts, Three-Phase, 60 Hz.
10.	Basin Heaters No. and Type:
a.	END OF SECTION