Section 236500
Cooling Towers
	PART 1 GENERAL
1.01	SECTION INCLUDES
A.	Closed-circuit, forced-draft, counter-flow cooling towers.
1.02	RELATED REQUIREMENTS
A.	Section 220513 - Common Motor Requirements for Plumbing Equipment.
B.	Section 220548 - Vibration and Seismic Controls for Plumbing Piping and Equipment.
C.	Section 221005 - Plumbing Piping.
D.	Section 230513 - Common Motor Requirements for HVAC Equipment.
E.	Section 230548 - Vibration and Seismic Controls for HVAC.
F.	Section 230593 - Testing, Adjusting, and Balancing for HVAC.
G.	Section 232113 - Hydronic Piping.
H.	Section 232123 - Hydronic Pumps.
I.	Section 236433 - Modular Water Chillers.
J.	Section 260583 - Wiring Connections: Electrical characteristics and wiring connections.
1.03	REFERENCE STANDARDS
A.	ABMA STD 9 - Load Ratings and Fatigue Life for Ball Bearings 2015.
B.	ABMA STD 11 - Load Ratings and Fatigue Life for Roller Bearings 2014.
C.	ASME B31.5 - Refrigeration Piping and Heat Transfer Components 2016.
D.	ASME PTC 23 - Atmospheric Water Cooling Equipment 2003, Reaffirmed 2014.
E.	ASTM A123/A123M - Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products 2017.
F.	ASTM A653/A653M - Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process 2018.
G.	ASTM B117 - Standard Practice for Operating Salt Spray (Fog) Apparatus 2018.
H.	ASTM D2794 - Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact) 1993 (Reapproved 2010).
I.	ASTM E84 - Standard Test Method for Surface Burning Characteristics of Building Materials 2018b.
J.	ASTM G21 - Standard Practice for Determining Resistance of Synthetic Polymeric Materials to Fungi 2015.
K.	CTI ATC-105 - Acceptance Test Code 2000.
L.	CTI STD-201 OM - Operations Manual for Thermal Performance Certification of Evaporative Heat Rejection Equipment 2017.
M.	CTI STD-201 RS - Performance Rating of Evaporative Heat Rejection Equipment 2017.
N.	CTI STD-111 - Gear Speed Reducers for Application on Industrial Water Cooling Towers; 2009.
O.	ISO 9001 - Quality management systems -- Requirements 2015.
P.	NEMA MG 1 - Motors and Generators 2017.
1.04	SUBMITTALS
A.	See Section 013000 - Administrative Requirements, for submittal procedures.
B.	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. Submit schematic indicating capacity controls.
C.	Shop Drawings: Indicate suggested structural steel supports including dimensions, sizes, and locations for mounting bolt holes.
D.	Manufacturer's Certificate: Certify that cooling tower performance, based on ASME PTC 23 meets or exceeds specified requirements and submit performance curve plotting leaving water temperature against wet bulb temperature.
E.	Manufacturer's Instructions: Submit manufacturer's complete installation instructions.
F.	Operation and Maintenance Data: Include start-up instructions, maintenance data, parts lists, controls, and accessories.
G.	Warranty: Submit manufacturer's warranty and ensure forms have been filled out in Owner 's name and registered with manufacturer.
H.	Maintenance Materials: Furnish the following for Owner 's use in maintenance of project.
1.	See Section 016000 - Product Requirements, for additional provisions.
2.	Extra Fan Belts: One set, matched, for each unit.
3.	Extra Spray Nozzles: One nozzle kits for each cell.
4.	Extra Access Door Gaskets: One for each door.
5.	Extra Valve Seats: One for each make-up valve and control valve.
1.05	QUALITY ASSURANCE
A.	Manufacturer Qualifications:  Company specializing in manufacturing the type of products specified in this section, with minimum twenty 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 [_____] years of experience and approved by manufacturer.
1.06	REGULATORY REQUIREMENTS
A.	Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated.
1.07	DELIVERY, STORAGE, AND HANDLING
A.	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.
B.	Comply with manufacturer's installation instructions for rigging, unloading, and transporting units.
1.08	WARRANTY
A.	See Section 017800 - Closeout Submittals, for additional warranty requirements.
B.	Provide a one year warranty to include coverage for defects in material and workmanship labor only.
C.	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) if motor space heater is properly wired.

	PART 2 PRODUCTS
2.01	MANUFACTURERS
A.	Basis of Design: Baltimore Aircoil Company
B.	Closed-Circuit, Forced-Draft, Counter-Flow Cooling Towers:
1.	Baltimore Aircoil Company; Series V: www.baltimoreaircoil.com
2.	Substitutions: See Section 016000 - Product Requirements.
2.02	MANUFACTURED UNITS
A.	Provide units for indoor or outdoor use, factory-assembled, sectional, vertical discharge, blow through design, with fan assemblies built into pan and casing.
2.03	COMPONENTS
A.	Cold Water Basin:
1.	Heavy-gage galvanized steel. Provide sloped basin with drain/clean-out connection.
----- Alternate for 304 Stainless Steel -----
2.	Sloped with depressed section with drain/clean-out connection. Type 304 bolted stainless steel panels and structural members. Basins constructed of 301 stainless steel are not acceptable.
----- Alternate for 316 Stainless Steel -----
3.	Sloped with depressed section with drain/clean-out connection. Type 316 bolted stainless steel panels and structural members. Basins constructed of 301 stainless steel are not acceptable.
B.	Casing Panels and Framework:
1.	Casing panels: 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 -----
C.	Casing panels and framework will be constructed of G235 galvanized steel.
----- ALTERNATE for 304 Stainless Steel -----
D.	Casing panels, framework, and fasteners will be constructed of Type 304 stainless steel. Type 301 stainless steel is not an acceptable alternative.
E.	Fans:  Forward curved centrifugal type mounted on steel shaft, with belt drive, bearings with ABMA STD 9 or ABMA STD 11 L-10 life at 80,000 hours, with extended grease fittings.
F.	Motors and Drives:
1.	Single speed (1800 rpm) mounted on adjustable steel base. Refer to Section 23 0513.
2.	Fan Drive System:
a.	Belt Drive: Designed for minimum 150 percent motor nameplate power.
G.	Fan Guard: Welded steel rod and wire guard, hot dipped galvanized after fabrication.
H.	Heat Transfer Coils:
1.	Wet Coil:
a.	Galvanized Steel: The coil shall be constructed of continuous serpentine all prime surface steel, be pneumatically tested at 375 psig (2,685 kPa), and be hot-dip galvanized after fabrication. The coil shall be designed for free drainage of fluid and shall be ASME B31.5 compliant. Maximum allowable working pressure shall be 300 psig (280 psig for coils supplied with a CRN).
----- Alternate for Half Coil Finning -----
b.	Optional Extended Surface Coil for Half the Rows: The coil shall be constructed of continuous serpentine all prime surface steel with half the rows finned at 5 fins per inch for seasonal wet/dry operation. The coils shall be pneumatically tested at 375 psig (2,685 kPa) and be hot-dip galvanized after fabrication. ASME B31.5 compliant and sloped for complete draining. Maximum allowable working pressure shall be 300 psig (280 psig for coils supplied with a CRN).
----- Alternate for Full Coil Finning -----
c.	Optional Extended Surface Coil for All the Rows: The coil shall be constructed of continuous serpentine all prime surface steel with all the rows finned at 5 fins per inch for seasonal wet/dry operation. The coils shall be pneumatically tested at 375 psig (2,685 kPa), and be hot-dip galvanized after fabrication. ASME B31.5 compliant and sloped for complete draining. Maximum allowable working pressure shall be 300 psig (280 psig for coils supplied with a CRN).
----- Alternate for 304 Stainless Steel Coil -----
304 Stainless Steel: Coil(s) shall be constructed of type 304 stainless steel serpentine tube. Tubes shall be sloped for free drainage and coil assembly shall be pneumatically tested at 375 psig (2,685 kPa). Coil(s) shall be ASME B31.5 compliant.
----- Alternate for ASME Coil-----
d.	ASME Coils:
1)	Coil(s) shall be designed and constructed to meet the requirements of ASME Boiler and Pressure Vessel Code, Section VIII, Division 1, and bear the U stamp.
I.	Distribution Section: Polyvinyl chloride piping header and branches with ABS plastic spray nozzles.
J.	Drift Eliminators: Three pass PVC, drift loss limited to 0.005 percent of total water circulated.
K.	Basin Water Level Control: PVC, balanced piston type make-up valve with plastic float.
----- ALTERNATE for Electric Water Level Controller-----
L.	Electronic water level control with NEMA 4 enclosure, solid state controls, stainless steel water level sensing electrodes. Stainless steel mounting hardware.
M.	Hardware: Galvanized steel nuts, bolts, washers, and tappers; assembled with phenolic epoxy coated, corrosion resistant washer head fasteners.
N.	Galvanized Steel Sheet Components: Hot-dipped galvanized, ASTM A653/A653M, with G235/Z700 coating, and finished with zinc chromatized aluminum paint.
2.04	PERFORMANCE REQUIREMENTS
A.	This section is based on specific selections of equipment, and these selections relate to selection of related equipment, Section 232123 - Hydronic Pumps and Section 236433 - Modular Water Chillers. In substituting equipment, ensure that performance selection criteria matches that specified or that the selection of related equipment is acceptable or is revised to suit.
B.	Capacity:
1.	Water Flow: [_____] gpm ([_____] L/sec).
2.	Entering Water Temperature: [_____] degrees F ([_____] degrees C).
3.	Leaving Water Temperature: [_____] degrees F ([_____] degrees C).
4.	Entering Air WB Temperature: [_____] degrees F (______ degrees C).
5.	Ambient Air DB Temperature/Switchpoint: [_____] degrees F (______ degrees C).
C.	External Static Pressure: [_____] inch wg ([_____] Pa).
D.	Electrical Characteristics:
1.	[____] hp ([____] kW).
2.	[____] volts, single phase, 60 Hz.
3.	Refer to Section 260583.
E.	Motor: Refer to Section 23 0513.
F.	Disconnect Switch: Factory mount disconnect switch in control panel.
2.05	ACCESSORIES
A.	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.	Basin Sweeper Piping: The cold water basin of the cooling tower shall be equipped with PVC sump sweeper piping with plastic eductor nozzles.
C.	Electric Temperature Controller: In pan; with sensor to cycle fans. Coordinate with other disciplines.
D.	Time Delay Relay: Limits fan motor starts to not more than six per hour. Coordinate with other disciplines.
E.	Vibration Switch:  Provide a mechanical local reset vibration switch. The mechanical vibration cutout switch will be guaranteed to trip at a point so as not to cause damage to the cooling tower. To ensure this, the trip point will be set in a frequency range of 0 to 3,600 RPM and a trip point of 0.2 to 2.0 g’s.
1.	(ALTERNATE) Provide an electronic remote reset vibration switch with contact for BAS monitoring. Wiring shall be by the installing contractor. The electronic vibration cutout switch shall be set to trip at a point so as not to cause damage to the cooling tower. To ensure this, the trip point will be set in a frequency range of 2 to 1000 Hertz and a trip point of 0.45 in/sec (0.0114 m/sec).
F.	Access Packages: See submittal documents for access package requirements. Platforms and ladders must ship assembled from cooling tower manufacturer.
1.	Exterior Ladder with Handrails: An aluminum ladder with galvanized steel safety cage and safety gate shall be provided for access to the top of the unit. 1-1/4 inch (32 mm) galvanized steel pipe handrail shall be provided around the perimeter of the cooling tower cells. The handrails shall be provided with knee and toe rails and shall conform to OSHA requirements applicable at the time of shipment. Galvanized steel drift eliminators will be supplied to provide dependable walking surface.
G.	Intake Sound Attenuation: The unit shall be equipped with intake sound attenuators consisting of fiberglass acoustical baffles encased in steel to further reduce sound levels.
H.	Discharge Options: The unit shall be equipped with a tapered hood lined with sound absorbing fiberglass acoustical baffles to reduce sound levels from the top of the unit.
1.	(Alternate without sound attenuation) The unit shall be equipped with a tapered hood to increase discharge velocity or to raise the discharge to the top of an enclosure.
	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.	Install tower on vibration isolators. Refer to Section 230548.
E.	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 232113.
F.	Connect make-up water piping with flanged or union connections to tower. Pitch to tower. Refer to Section 221005.
G.	Connect overflow, bleed, and drain, to floor drain.
3.02	FIELD QUALITY CONTROL
A.	See Section 014000 - 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.
C.	Test for capacity under actual operating conditions in accordance with CTI ATC-105 and verify specified performance.
1.	Refer to Section 230593.
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.	External Static Pressure:
8.	Number of Fan Motors:
9.	Motor Size:
10.	Heaters No. and Type:
	END OF SECTION