Torres Enfr Evapco

A D VA N C E D T E C H N O L O G Y I NI N D U C E D D R A F T, C O U N T E R F L O W C O O L I N G T O W E R S

3 2 t o 4 1 2 0 N O M I N A L T O N S(139 TO 18,114kW)

TECHNOLOGY FOR THE FUTURE. . .AVAILABLE TODAY!

Bulletin 331A

EVAPCO Power-Band Drive System The AT Cooling Tower features the highly successful, easy

maintenance, heavy duty Power-Band Drive System. Standard heavy-duty pillow block bearings with a minimum

L10 life of 75,000 hours. Extended lube lines. External motor/belt adjustment. Aluminum Alloy Sheaves, Solid-Back Multi-Groove Power-Band

Belts and Totally Enclosed motors are standard. Five (5) Year Motor and Drive Warranty.

Totally Enclosed Fan Motors Motors positioned for external access. Assures long life. Motor location allows for easy accessibility

and serviceability. Five (5) Year motor warranty.

EVAPCOAT Corrosion Protection System G-235 Galvanized Steel Construction and Stainless Steel StrainersEVAPCO set the

standard with 2.35oz. of zinc per square foot of surface area. Another EVAPCO standardthe stainless steel suction strainer eliminates excessive

wear and corrosion. Non-corrosive PVC Water Distribution System, Drift Eliminators and Inlet Louvers. This system provides maximum corrosion protection as standard.

2

Since its founding in 1976,EVAPCO, Inc. has becomea world-wide leader in sup-plying quality cooling equipmentfor thousands of customers inboth the commercial and indus-trial markets.

EVAPCOs success has been the re-sult of a continual commitment toproduct improvement, qualityworkmanship and a dedication toproviding unparalleled service.

Our emphasis on research and de-velopment has led to many prod-uct innovations a hallmark ofEVAPCO through the years.

The ongoing R & D Program en-ables EVAPCO to provide the mostadvanced products in the industry technology for the future, avail-able today.

With 16 facilities in seven coun-tries and over 170 sales offices in42 countries world-wide, EVAPCOis ready to assist in all your equip-ment needs.

2008 EVAPCO, INC.

NEW!

Louver Access Door Hinged access panel with quick

release mechanism Allows easy access to perform

routine maintenance and inspec-tion of the makeup assembly,strainer screen and basin

Available on models with 5 ft.and 6 ft. tall louver sizes

Easy Field Assembly A new field assembly seam design

which ensures easier assembly andreduced potential for field seam leaks

Self-guided channels guide the fancasing section into position improvingthe quality of the field seam

Eliminates up to 66% of fasteners

NEW!

EVAPCO, Inc., continues its dedicationto advancements in induced draft,counterflow cooling tower technologyand easy maintenance with the

Advanced Technology Cooling Tower...The EVAPCO AT!The AT is the result of decades of engineering success basedon easy maintenance, durable construction and a highlyefficient design. The AT brings marquee features that makeit the better choice in cooling towers. These features arepresented in this exclusive AT Marketing brochure.

Mark owned by the Cooling Technology Institute

THE ADVANCED TECHNOLOGY DESI GN PROVIDING E

EVAPCO unequivocallyguarantees the thermalperformance of the ATcooling tower product line.

Exclusive 5 Year Motor& Drive Warranty Covers the complete drive

system, including the motor. Covers all drive components on

belt or gear drive units. Standard on all AT Models. Upgraded 5 year Complete

Product warranty on modelswith optional stainless steelconstruction.

Optional Motor Davit and Working PlatformMotor Davit Motor davit and bracket option for easy motor removal. Also available for Gearbox removal.Platform Platform and ladder arrangement available as an option. Provides additional working surface for the service mechanic.

Quick Connect Piping System All inlet and outlet piping connections are

beveled for welding and grooved to accepta mechanical coupling device as standard.

Facilitates easy pipe connections for quickinstallation.

Flanged connections are available as anoption. (See page 10 Optional Equipment)

Available in 55 Cross Sections and a capacity range of 32 to 4120 NominalTons (139 to 18,114 kW)! The AT has a model for every application.

If there is an application for which the standard catalog product line does not work, EVAPCO will make acooling tower that will fit your requirement! Consult your local EVAPCO Representative or the factory forall your cooling tower needs.

CTI Certified-Standard 201 Independent Certification. Eliminates necessity for costly field

performance tests.

Clean Pan SlopedBasin Design Designed to

completely drain thecold water basin.

Helps prevent buildupof sediment andbiological film.

Eliminates standingwater after draindown.(See details ofdesign on page 6)

Smooth Flow Fan Soft-connect blade to

hub design. VFD-friendly Eliminates critical blade passing

frequencies at any speed.(Not available on 4 ft. wide models)

Water Distribution System Non-corrosive PVC construction with new EvapJet

nozzles. Large orifice nozzles prevent clogging and are

threaded for easy removal and positive positioning. 66% fewer nozzles! System branches have threaded end caps to assist

with debris removal.

NEW! EvapJet Nozzle

3

AT

G EASIER SOLUTIONS AND BETTER CHOICES

E A S Y S O L U T I O N S , B E T T E R C H O I C E S !

4

DE S I G N AD VA N TA G E S

Air Intake

Sunlight

Splashout

Debris

Sunlight

Splashout

Debris

The Advanced Technology DesignThe AT Cooling Tower product line is an Advanced Technology design which utilizes induced draft, counterflow technologythemost efficient in the industry and the best design for operation in a freezing climate. The counterflow design provides the ATCooling Tower with inherently better operational and maintenance features. These features are described below.

Principle of OperationWarm water from the heat source is pumped to the water distribution systemat the top of the tower. The water is distributed over the wet deck fill bymeans of large orifice nozzles. Simultaneously, air is drawn in through the airinlet louvers at the base of the tower and travels upward through the wetdeck fill opposite the water flow. A small portion of the water is evaporatedwhich removes the heat from the remaining water. The warm moist air isdrawn to the top of the cooling tower by the fan and discharged to the at-mosphere. The cooled water drains to the basin at the bottom of the towerand is returned to the heat source.The vertical air discharge of the AT design and the distance between thedischarge air and fresh air intakes, reduces the chance of air recirculation,since the warm humid air is directed up and away from the unit. For detailedlayout information please consult EVAPCOs Equipment Layout Guidelines Bul-letin 311.

Patented* Efficient Drift EliminatorsAn extremely efficient drift eliminator system is standard on the AT CoolingTower. The system removes entrained water droplets from the air stream tolimit the drift rate to less than 0.001% of the recirculating water rate.With a low drift rate, the AT Cooling Tower saves valuable water and watertreatment chemicals. The AT can be located in areas where minimum watercarryover is critical, such as parking lots.The drift eliminators are constructed of an inert polyvinyl chloride (PVC) plasticmaterial which effectively eliminates corrosion of these vital components.They are assembled in sections to facilitate easy removal for inspection of thewater distribution system.

Patented** EVAPAK FillThe patented EVAPAK fill design used in the AT Cooling Tower is specially de-signed to induce highly turbulent mixing of the air and water for superior heattransfer. Special drainage tips allow high water loadings without excessive pres-sure drop. The fill is constructed of inert polyvinyl chloride, (PVC), will not rot ordecay, and is formulated to withstand water temperatures of 130F (55C). Be-cause of the unique way in which the crossfluted sheets are bonded together,and the bottom support of the fill section, the structural integrity of the fill isgreatly enhanced, making the fill usable as a working platform.The fill selected for the AT Cooling Tower has excellent fire resistant qualities.AT Cooling Tower fill has a flame spread rating of 5 per ASTM-E84-81a.A higher temperature fill is available for water temperatures exceeding130F (55C). Consult your EVAPCO representative for further details.

Superior Air Inlet Louver and Screen DesignThe air inlet louver screens on the AT are constructed of corrosion-free PVC.They are a bi-planar design that eliminates splashout and reduces the potentialfor algae formation inside the tower.In uni-planar louver systems used by other manufacturers, circulating waterdroplets tend to splashout, especially when the fans are shut off. With the ex-clusive EVAPCO bi-planar louver system, the water droplets are captured on theinward sloping pass, eliminating splashout and the problems associated with it.EVAPCOs patented louver design completely encloses the basin area. In addi-tion to eliminating splash out, EVAPCOs inlet louver screens are of a SightTight design. Direct sunlight is blocked from the water inside the coolingtower, thereby reducing the potential of algae formation. Water treatmentand maintenance costs are substantially reduced.While effectively containing the recirculating water and blocking sunlight, thelouver design has a low pressure drop. The low pressure drop results in lower fanenergy consumption, which reduces the operating costs of the cooling tower.

Hot Saturated Discharge Air

Hot Water In

CooledWater Out

Cool DryEntering Air

* U.S. Patent No. 631580481 ** U.S. Patent No. 5124087


5

DE S I G N AD VA N TA G E S

Pressurized Water Distribution SystemThe water distribution system is made of schedule 40 PVC pipe andEvapJet ABS plastic water diffusers for corrosion protection in thiskey area. The piping is easily removable for cleaning. The waterdiffusers have a 1 inch diameter (25mm) opening and are practi-cally impossible to clog. They also have an anti-sludge ring extend-

ing into the headers to preventsediment from building up in thediffuser opening. In addition, thespray branches have threaded endcaps to allow easy debris removal.The spray pressure for all AT CoolingTowers is between 1 and 6 psig (7and 42 kPa) at the inlet header. Theactual spray pressure will be shownon the certified drawings which areprepared for each unit.

Reduced Piping CostsEach cell of the AT Cooling Tower is furnished with one inlet andone outlet piping connection. This design reduces the amount ofexternal piping and thereby lowers the installed cost of the coolingtower. The water distribution system is pressurized and self balanc-ing. Since field balancing is not required on the AT, the need forflow balancing valves is eliminated, further reducing the cost oftower installation. The wide orifice nozzles with anti-sludge ringused in the AT water distribution system helps prevent clogging, re-ducing the maintenance costs of the water distribution system.

Fast, On-Time ShipmentsThe AT is a completely factory assembled cooling tower manufac-tured by a dedicated professional workforce, expert in buildingcooling towers. Factory trained mechanics and EVAPCOs strictquality control and inspection procedures guarantee the quality ofevery unit shipped.EVAPCOs controlled factory environment ensures fast on-time ship-ments, allowing the AT to be available WHEN THE CUSTOMERWANTS IT!

Optimum Design for Freezing ClimatesThe counterflow fill design used in the AT Cooling Tower is wellsuited for winter operation. The wet deck surface is totally en-cased, and protected from freezing winds thus inhibiting ice for-mation on the fill section.The even temperature gradient of the counterflow fill designmakes the AT Cooling Tower the ideal unit for operation in freez-ing climates.The counterflow design of the AT Cooling Tower fill section re-duces the chance of ice formation and with bottom support, elimi-nates fill collapse should ice form.

New EvapJet nozzle comparedto previous EVAPCO nozzles


6

MA I N T E N A N C E AD VA N TA G E S

Stainless Steel StrainersThe EVAPCO standard for many years, the stainless steel strainer is onecomponent of the cooling tower subject to excessive wear and corrosion.With stainless steel construction, this component will last the life of thecooling tower.

The Advanced Technology Easy Maintenance Basin DesignThe cold water basin is the most important area of a cooling tower to maintain. As a result of the evaporation process in acooling tower, dirt and debris will collect in the basin and must be cleaned out on a regular basis. EVAPCOs AT basin section isdesigned to allow quick and easy accesspromoting maintenance of the cold water basin. The basin features the following:

Easy AccessThe cold water basin section is easily accessible from ground level by simplyloosening the (2) two Quick Release Fasteners on the inlet louver assem-blies surrounding the cooling tower and lifting out the lightweight louver.

The basin can be accessed from all (4) four sides of the cooling tower. Thebottom of the fill section is a minimum of four (4) feet (1.2m) above thebasin floor. This open basin design enables the AT basin to be easily cleaned.

Clean Pan Basin DesignThe AT features a completely sloped basin from the upper to lower pan sec-tion. This Clean Pan design allows the water to be completely drainedfrom the basin. The cooling tower water will drain from the upper sectionto the depressed lower pan section where the dirt and debris can be easilyflushed out through the drain. This design helps prevent buildup of sedi-mentary deposits, biological films and minimizes standing water.Note: on 4' wide units, the pan is sloped without the step

Easy, Removable Air Inlet Louvers with QuickRelease FastenersThe AT features a Quick Release Fastener design consisting of (2) two largethumbscrews and a retaining bracket system. By loosening the thumb-screws, the retaining bracket lifts away from the louver frame, allowingthe louver to be removed while the retaining bracket and thumbscrews stayon the cooling tower. Design allows quick removal of louvers. Louver fastener is large and easy to release. Louver fastener remains on the uniteliminating the possibility of

missing hardware.

Louver Access Door (optional)To aid in basin maintenance, all AT models can be equipped with anoptional louver access door. This feature allows easy access to performroutine maintenance and inspection of the makeup assembly, strainerscreen and basin without removing an entire inlet louver. The louveraccess door is standard on models with 5 and 6 ft. tall louver sizes.


7

MA I N T E N A N C E AD VA N TA G E S

The Advanced Technology Easy Maintenance Drive SystemThe EVAPCO POWER-BAND drive system utilized on the AT Cooling Tower is the easiest drive system to maintain inthe industry. There is no need to stand inside the cold water basin to service the bearings, belts, gear reducers, floatingshafts or electrical equipment. In addition, there is no need for fan deck handrails or safety cages, since all periodic main-tenance can be safely performed from the side of the AT. The most important features of this design are listed below.

Models AT 19-56 through AT 39-942Motor Mount, Power Band Belt Adjustment and Bearing Lubrication

The fan motor and drive assembly are designed to allow easy servicing of the motor and adjustment of the belt tension fromthe exterior of the unit. The T.E.F.C. fan motor is mounted on the outside on these models and is protected from the weatherby a cover which swings away for maintenance.

A large hinged access door is located on the side of the unit for easy access to the fan drive system. The belt can be adjustedby tightening the J-Bolts on the motor base and the tension can be checked easily through the access door, all while standing

at the side of the unit. Thebearings can also be lubri-cated from the side of theunit. The bearing lubricationlines have been extended tothe exterior casing and arelocated by the access door,thus making bearing lubri-cation easy.

Sloped access ladders andworking platforms areavailable as an option tofacilitate maintenance.See page 9 OptionalEquipment for details.

Models AT 110-112 through AT 428-1248Motor Mount, Power Band Belt Adjustment and Bearing Lubrication

The T.E.A.O. fan motor is located inside the fan casing on the large ATCooling Tower, and is mounted on a rugged heavy duty motor base. Themotor base is designed to swing completely to the outside of the unitthrough a very large hinged (14 square feet) (1.3 square meters) accessdoor greatly simplifying motor maintenance.The unique swinging motor mount designed for these models featureseasy belt adjustment from the exterior of the unit. The T.E.A.O. fanmotor is mounted on an adjustable base which is supported by two heavyduty galvanized steel pipes. The belt is adjusted by tightening an all-thread which runs through the motor base.The innovative motor base features a unique locking mechanism for apositive belt adjustment and is also used to adjust the belt tension if awrench is not available.Bearing lubrication fittings are extendedto the side of the unit inside the accessdoor to allow easy application of the bear-ing lubricant. This external location al-lows for easy servicing of the bearings andis another important advantage ofEVAPCO equipment.To facilitate motor removal, an optionalmotor davit is available. See OptionalEquipment page 9 of this brochure.


8

DR I V E SY S T E M DE S I G N

The Advanced Technology POWER-BAND Drive System DesignThe AT Cooling Tower features the highly successful EVAPCO POWER-BAND Belt Drive System engineered for heavy-duty opera-tion. The POWER-BAND Drive System has consistently provided trouble-free operation in the most severe duty cooling tower ap-plications. In addition, the complete drive system including the fan motor is standard with a (5) Five Year Motor & Drive Warranty.

Fan MotorsAll AT Cooling Tower models utilize heavy duty totally enclosed (T.E.F.C. orT.E.A.O.) fan motors designed specifically for cooling tower applications. Inaddition to the standard motors offered on each cooling tower, EVAPCO offersmany optional motors to meet your specific needs, including: Premium Efficiency Motors Multi-Speed Motors Inverter-Duty Motors for VFD ApplicationsModels AT 14-64 through 14-912 have a direct drive fan system. The T.E.A.O.motor is located inside the cooling tower.The T.E.F.C. motors are located on the outside of the unit on Models AT19-56 through AT 39-942 and are protected by a hinged, swing away cover.Models AT 110-112 through 428-1248 have T.E.A.O. motors located inside thefan section on a heavy duty motor base which swings to the outside for repairor removal.

Five Year Motor and Drive WarrantyEVAPCO provides a standard 5 year motor and drive warranty on allPower-Band belt drive and optional gear drive AT Cooling Towers. Thisunique warranty is designed to offer the end user optimum protectionagainst fan drive and motor failure. It is a comprehensive plan whichincludes the fan, fan shaft, belts, sheaves, fan bearings, gear box, flexiblecoupling, driveshaft and the motor.

Power-Band Belt DriveThe Power-Band drive is a solid-back multigroove belt system that hashigh lateral rigidity. The belt is designed for cooling tower service, and isconstructed of neoprene with polyester cords. The drive belt is sized for150 percent of the motor nameplate horsepower ensuring long andtrouble free operation.

Drive System SheavesDrive system sheaves located in the warm, moist atmosphere inside thecooling tower are constructed of an aluminum alloy. Those locatedexternally are protected by a hinged protective cover.

Fan Shaft BearingsThe fan shaft bearings on the AT cooling tower are specially selected toprovide long life, minimizing costly downtime. They are rated for an L-10life of 75,000 to 135,000 hours, making them the heaviest duty pillowblock bearing in the industry used for cooling tower duty.

On Models AT 110-112 through 428-1248On Models AT 19-56 through 39-942On Models AT 14-64 through 14-912


9

OP T I O N A L EQ U I P M E N T

Optional EquipmentThe standard design of the EVAPCO AT provides the customer with the easiest cooling tower to maintain in the industry.There are additional options which can make maintenance easier and extend the life of the cooling tower. These optionsare listed below.

Sloped Access LaddersThe EVAPCO designed access ladder features a sloped ships typeladder arrangement which provides fast and easy access to thewater distribution system and drive components. A handrail is at-tached to the sloped ladder for safe and easy ascent and descent.There is no need for safety cages with this design. The ladder(s)will ship loose and must be field mounted. Meets all applicableOSHA requirements.Note: The sloped access ladder is available on all models AT 19-56through AT 428-1248. A vertical ladder is available on models AT 14-64 through 14-912.

Working Platform & Ladder with DavitAT Cooling Towers are available with an external working platformand ladder to allow easy servicing of the fan motor and water dis-tribution system. Providing a convenient platform to performwork, the heavy duty galvanized steel platform is self-supporting-which eliminates the need for any external support. A less expen-sive alternative to field erected catwalks, the working platformoption uses a straight ladder as standard and ships in sections foreasy installation. (The working platform and ladder meet all appli-cable OSHA requirements.)Note: The Working Platform is not available on models AT 14-64through 14-912.The davit option eliminates crane rentals and facilitates the removalof motors and gear drives. The davit and bracket are constructed ofaluminum and are mounted on the side of the unit. The optionalfan motor and gear davit ships loose and is installed in the field.

Stainless Steel Water Touch BasinThe AT Cooling Tower has a modular design which allows specificareas to be enhanced for increased corrosion protection. The basinarea of the cooling tower experiences turbulent mixing of air andwater, in addition to silt build-up. In conjunction with the EVAP-COAT Corrosion Protection System, EVAPCO offers an optional Stain-less Steel Water Touch Basin. This option provides Type 304 or Type316 stainless steel for the entire basin area including the supportcolumns of the cooling tower and the louver frames.The basin section provides the structural support for the unit and isthe most important part of the cooling tower. The Stainless SteelWater Touch Basin provides maximum corrosion protection.

Basin Level PlatformAT Cooling Towers are available on some box sizes with a basin levelplatform and ladder to allow easy servicing of the cold water basin. Facilitates Maintenance

- Adjust Float Assembly- Clean Basin and Suction Strainer

Self Supporting and Easy Installation- Platform Supported from Unit- Ladder Requires Field Support- Ships in Modules for Easy Installation

*Louver frame and support not in photo


10

OP T I O N A L EQ U I P M E N T

Electric HeatersElectric immersion heaters are available as an option and are located in thebasin of the tower. They are sized to maintain a +40 F (4.5C) pan watertemperature at 0F (-18C) ambient with the fans off*. They are furnishedwith a combination thermostat/low water protection device to cycle theheater on when required and to prevent the heater elements from energiz-ing unless they are completely submerged. All components are enclosed inrugged, weather proof enclosures for outdoor use. Heater control packagesthat include contactor, transformer or disconnects are available, consult yourlocal EVAPCO representative.(*) - Electric heater selection based on 0F (-18C) ambient temperature.For alternate low ambient heater selections, consult factory. Refer to thefactory certified heater drawing for quantity and sizing of heaters.

Electric Water Level ControlEVAPCO cooling towers are available with an optional electric water levelcontrol system in place of the standard mechanical makeup valve and floatassembly. This package provides very accurate control for the basin waterlevel and does not require field adjustment, even under varying operatingconditions.The control was designed by EVAPCO and is manufactured exclusively forEVAPCO. It consists of multiple heavy duty stainless steel electrodes. Theseelectrodes are mounted external to the unit in a vertical stand pipe. Forwinter operation, the stand pipe must be wrapped with electric heatingcable and insulated to protect it from freezing.The weather protected slow closing solenoid valve(s) for the makeup waterconnection is factory supplied and is ready for piping to a water supply witha pressure between 25 and 50 psig (172 and 345 kPa).

Other Options Heater Control Packages Hot Water or Steam Coils Steam Injectors Bottom Suction Connections Vibration Isolators (single cell only) Vibration Switches Remote Sump Connections MotorsEnergy Efficient / Inverter Duty /

2S/1W and 2S/2W / Mill and Chem DutyAutomotive Duty and Many More,Consult the Factory

Flanged Connections Bypass Connections withDiffuser Hood

Equalizers andFlume Plates

iES the internet Equipment SolutioniES is a Web based computer selection program which allowsthe design engineer to choose EVAPCO models and optimizeunit selections. The program allows the engineer to evaluatethe equipments thermal performance, space and energy re-quirements. Once the model is selected and optional equip-ment features are inserted, the engineer may output acomplete specification AND a unit drawing from this pro-gram. The software is designed to provide the user with max-imum flexibility in analyzing the various selection parameterswhile in a friendly and familiar Windows format.The iES Equipment Selection Software program may be ac-cessed using Microsoft Internet Explorer after contacting yourlocal EVAPCO sales representative. Users may make Requestsfor Quotations through the website or by e-mailing EVAPCOat this address [email protected]

Technical Support Services

EVAPCOs WebsiteLog on to EVAPCOs new and improved websitehttp://www.evapco.com. for expanded product informa-tion. Users can view and download unit certified and steelsupport drawings in a .pdf format readable using AdobeAcrobat. In addition, scaled isometric views of our equip-ment in CAD (.dwg format) are also available. Product liter-ature, Rigging and Maintenance Instructions and EVAPCOlogo apparel and merchandise are all accessible online fromyour computer.

With the internet Equipment Solution program, equipment se-lections, written specifications, unit drawing files and EVAPCOon-line information are readily available from the comfort ofyour own office!


11

LOW SOUND SOLUTIONS

Water SilencerReduces Water Noise in the Cold Water Basin up to 7dB(A)!The water silencer option is available for all induced draft models and is located in thefalling water area of the cold water basin. The water silencer will reduce the high fre-quency noise associated with the falling water and is capable of reducing overall soundlevels 4 dB(A) to 7 dB(A) measured at 5 ft. from the side or end of the unit. The watersilencers reduce overall sound levels 9 dB(A) to 12 dB(A) (depending on water loadingand louver height) measured 5 ft. from the side or end of the unit when water is circu-lated with fans off.

The water silencers are constructed of lightweight PVC sections and can be easily removedfor access to the basin area. The water silencer will have no impact on unit thermal per-formance.

The Expanded Family of the EVAPCO Super Low Sound Fans!

Low Sound Fan* 4 7 dB(A) Reduction!The NEW Low Sound Fan offered by EVAPCO is a wide chord blade design for sound sensi-tive applications where low sound levels are desired. The Low Sound Fan shall utilize aunique soft-connect blade-to-hub design that is compatible with Variable Speed Drives.Since the blades are not rigidly connected to the fan hub, no vertical vibration forces aretransmitted to the unit structure which totally eliminates sound pressure levels 4 dB(A) to7 dB(A), depending on specific unit selection and measurement location. The fans arehigh efficiency axial propeller type and are CTI Certified on the AT line of Cooling Towers.

The Low Sound Fan is NOT available on the UT Cooling Tower.

* The CTI Certified Low Sound Fan will have a thermal performance derate up to 3.5%.Consult the factory or iES Program for actual thermal performance.

Fan Discharge Sound Attenuation Up to 10 dB(A) Reduction!The discharge attenuator is a factory assembled straight sided discharge hood designedto reduce overall discharge sound levels at full fan speed 5 dB(A) to 10 dB(A), depend-ing on specific unit selection and measurement location. It is constructed of G-235 galva-nized steel as standard (options available for Type 304 stainless steel) and includesinsulated walls and a low pressure drop baffling system that is acoustically lined withhigh density fiberglass. The discharge attenuator is supported entirely by the unit and isshipped as an assembled section for easy mounting in the field. The discharge attenua-tor is covered by a heavy gauge hot-dip galvanized steel fan guard to prevent debrisfrom entering the attenuator.

The discharge attenuator will have a minimal impact on unit thermal performance (0%-2% derate depending on specific unit selection).

The discharge attenuator is available on 10 ft., 12 ft., 14 ft., 20 ft., 24 ft. and 28 ft. wideAT Models with the Low Sound Fan option.

(Note: The Fan Discharge Attenuator Option is NOT available on UT or USS Modelsprovided with the Super Low Sound Fan.)

Note: These items are not available for the AT/USS 14-64 through 14-912 cooling towers.

Super Low Sound Fan 9 15 dB(A) Reduction!The Super Low Sound Fan offered by EVAPCO utilizes an extremely wide chord bladedesign available for sound sensitive applications where the lowest sound levels aredesired. The fan is one-piece molded heavy duty FRP construction utilizing a forwardswept blade design. The Super Low Sound fan is capable of reducing the unit soundpressure levels 9 dB(A) to 15 dB(A), depending on specific unit selection and meas-urement location compared to the original AT fan.


12

Notes:

T E C H N O L O G Y F O R T H E F U T U R E , AV A I L A B L E T O D AY !

13

IBC CO M P L I A N C E

IBC

CO

MPLIA

NC

E

We Stand Tall Through it All!

Wind, Rain, Earthquake

and Hurricane

EVAPCO Cooling Towersdesigned to withstand seismic or wind load forces.

The International

Building Code (IBC) is a

comprehensive set of

regulations addressing

the structural design

and installation

requirements for

building systems

including HVAC

and industrial

refrigeration

equipment.

With the advent

of the IBC,

EVAPCO is

proud to

introduce the new and

improved line of AT, UT and USS

Cooling Towers with IBC 2006

compliance standard.

tional

de (IBC) is a

sive set of

addressing

ral design

tion

nts for

stems

VACind

rial

on

.

dvent

the new andddd

ine of AT, UT and USS

owers with IBC 2006

e standard.



What is IBC?International Building CodeThe International Building Code (IBC) is a comprehensiveset of regulations addressing both the structural designand the installation requirements for building systems including HVAC and industrial refrigeration equipment.The IBC is intended to replace BOCAs The National Build-ing Code, ICBOs Uniform Building Code and SBCCIs Stan-dard Building Code.

Compared to previous building codes that consideredonly the building structure and component anchorage,the requirements contained within the IBC address an-chorage, structural integrity, and the operational capabil-ity of a component following either a seismic or windload event. Simply stated, the IBC code provisions re-quire that evaporative cooling equipment, and allother components permanently installed on astructure, must be designed to meet the same seis-mic or wind load forces as the building to whichthey are attached.

How Does IBC 2006 Apply to CoolingTowers?Based on the project zip code and site design factors, cal-culations are made to determine the equivalent seismicg force and wind load (in pounds per square foot psf)on the unit. The cooling tower must be designed to with-stand the greater of either the seismic or wind load.

All locations with design criteria resulting in a seismicdesign force of up to 1.0g or a wind load of 60 psf orbelow will be provided with the standard AT structuraldesign. An upgraded structural design is available forinstallations with design criteria resulting in g forcesgreater than 1.0g. The highest g force location inNorth America is 5.12g. The highest wind load shownon the maps is 170 mph, which is approximately equal to

145 psf velocity pressure. Therefore, the upgradedstructural design package option for the New AT isdesigned for 5.12 g and 145 psf making it applica-ble to ALL building locations in North America.

Seismic DesignThe chart shown below, from the US Geological SurveyWebsite http://www.usgs.gov/ shows the potential seis-mic activity in the United States. Buildings constructed inthe red, orange and yellow areas of the map are mostlikely to require the upgraded AT construction designbased on the site seismic design factors. Critical use facil-ities, such as hospitals, are also more likely to require theupgraded design.

The project architect or civil engineer is responsible fordetermining the seismic design factors to be used for thebuilding design. A mechanical consulting engineer and/ordesign build contractor will then apply these factors to aseries of charts and graphs to determine the appropriateseismic design factors based on the location of the instal-lation and ultimately the importance of the facility.The specific factors necessary for seismic design as well asa sample seismic calculation are shown on the next page.

32+

Highest Hazard

Lowest Hazard

%g

24-3216-248-164-82-40-2

Map courtesy US Geological Survey website

In its continuing commitment to be the leader in evaporative cooling equipment design andservices, EVAPCO AT Cooling Towers are now Independently Certified to withstand Seismic and

Wind Loads in ALL Geographic Locations and Installations in accordance with IBC 2006.

The New AT is offered with a choice of TWO structuraldesign packages:

Standard Structural Design For projects with1.0g seismic or 60 psf wind loads

Upgraded Structural Design Required forprojects with 1.0 g seismic or 60 psf wind loads>


15


Wind DesignThe IBC 2006 code book includes a map of basic windspeed (3-second gust) by contour lines. However, localregulations may be more stringent than these publishedspeeds. The specific factors necessary for wind load aswell as a sample wind load calculation are shown onPage 16.

Whichever design force - seismic or wind - is more severefor the building, governs the design of the building andall attached equipment.

Design ImplementationEVAPCO applies the seismic design and wind load infor-mation provided for the project to determine the equip-ment design necessary to meet IBC requirements. Thisprocess ensures that the mechanical equipment and itscomponents are compliant per the provisions of the IBCas given in the plans and specifications for the project.

Independent CertificationAlthough the IBC references and is based on the struc-tural building code ASCE 7, many chapters and para-graphs of ASCE 7 are superceded by the IBC, independentcertification and methods of analysis are such paragraphs.Per the most recent edition of the code, the EVAPCOcompliance process included an intensive analysis by anindependent approval agency. As required by the Inter-national Building Code, EVAPCO supplies a certificate ofcompliance as part of its submittal documents. The certifi-cate of compliance demonstrates that the equipment hasbeen independently tested and analyzed in accordancewith the IBC seismic and wind load requirements. Evapcohas worked closely with the independent approvalagency, The VMC Group, to complete the independentequipment testing and analysis.

If the seismic g force or wind load psf requirements forthe project site are known, EVAPCOs online equipmentselection software, iES, will allow you to choose the re-quired structural design package either standard con-struction or upgraded construction.

If the project requirements are unknown, the followingcalculations must be completed.

For further questions regarding IBC compliance, pleasecontact your local EVAPCO Representative or visitwww.evapco.com.

Seismic Load CalculationsThe data required to calculate the seismic load are:

Occupancy Category I, II, III or IV depending on thenature of the building occupancy. Table 1604.5 in the IBC2006 Code Book defines each of the four categories in de-tail. In summary the four categories are:

Category I - structures that represent a low hazard tohuman life in the event of a failure.

Category III - structures that represent a substantialhazard to human life in the event of a failure.

Category IV - structures designated as essentialfacilities.

Category II - any structures not listed in I, III or IV.

Site Classification A, B, C, D, E or F based on the typesof soil and their engineering properties. Table 1613.5.2 inthe IBC 2006 Code Book defines each of the categories indetail. IBC specifies site class D when soil properties areunknown.

ecnailpmoCfoetacifitreCsrewoTgnilooCTU,TAU,SSU,TA

srelooCtiucriCdesolCWTAsresnednoCevitaropavEE-CTAHTC,

snoisivorPdaoLdniWdnacimsieSehtdeecxeroteemotdeifitrecerA.tcejorpsihtrofsedocgnidliubelbacilppaehtnihtroftes

llagniwollofderutcafunamneebevahstcudorpesehT.smargorpecnarussaytilauqelbacilppa

:sedoCgnidliuBelbacilppA6002CBI7-ECSA

0005APFN

:tropeRdecnerefeR78334-AMV

:ycnegAlavorppApuorGgnitlusnoCcimsieSCMV

.secivreSdnastcudorPrefsnarTtaeHnistsilaicepS...OCPAVE 100COCCBIDI

When using the EVAPCO selection software to make aselection, these calculations are already incorporatedinto the selection process. Simply enter the requiredfactors and the Seismic Design Force and Wind Loadwill be calculated automatically!!

Wind Load Map Courtesy IBC 2006 Text See full-sized map for location specific values


16


Maximum Spectral Response Acceleration (Ss) Nu-merical value found using the U.S. Geological (USGS) databased on the Zip Code of the project. This data point canbe determined using the Ground Motion Parameter Cal-culator at http://www.usgs.gov/. Note the calculator as-sumes a site classification of B for the 0.2 secondmaximum Ss. The site coefficient (Fa), defined below, willcorrect for the actual site classification.

Site Coefficient (Fa) Values ranging from 0.8 to 2.5 de-termined based on the Ss and the Site Classification. Table1613.5.3(1) in the IBC 2006 Code Book defines these values.

Design Spectral Response Acceleration (SDS) A cal-culated value using the values for Ss and Fa.

Amplification Factor (ap) 2.5 for flexible componentsor flexibly attached components. Due to its low inherentnatural frequencies, most evaporative cooling equipmentfalls under the definition of flexible. Therefore the de-fault for Cooling Towers is 2.5. See Table 13.6-1 in theAmerican Society of Civil Engineers (ASCE) Standard 7-05,to which IBC often references, for more information.

Response Modification Factor (Rp) 2.5 for non-iso-lated evaporative cooling equipment. 2.0 for vibrationisolated evaporative cooling equipment. Table 13-6.1 ofASCE 7-05 provides additional information.

Component Operating Weight (Wp) This weightterm has been removed from the equation below, be-cause EVAPCO is expressing the force in terms of gs andnot lbs.

Importance Factor (Ip) 1.5 for Occupancy Category IV,life safety components required to function after a seis-mic event or component containing hazardous content.1.0 for all other components. ASCE 7-05 Section 13.1.3provides additional detail on importance factors.

Installation Location (Z/h) 0 for units installed atground level. 1.0 for units installed on a rooftop. PerASCE 7-05 Section 13.3, z = the height of the point of at-tachment of the component and h = the relative roofheight.

Seismic Design Force, (Fp) G-force that the unitmust be able to withstand. This number is calculatedusing the factors described above. The New AT is offeredwith a choice of two structural design packages, consist-ing of:

Standard Structural Design 1.0g Upgraded Structural Design up to 5.12g (the

maximum value for North America)

Seismic Load Sample Calculation

The following example demonstrates the procedure fordetermining which structural design package a Commu-nity Hospital located in Charleston, SC (zip code 29401)would require under the latest version of IBC. In this ex-ample, the cooling tower will be installed on a roof, ap-proximately 60 feet above grade. The unit will also beinstalled with a vibration isolation system.

Step 1: Calculate the Design Spectral Response Accelera-

tion (SDS)

Where:

SS = 1.495; using the USGS Ground Motion ParameterCalculator

Fa = 1.0; from Table 1613.5.3(1) in the IBC 2006 CodeBook assuming a Site Classification of D

Step 2: Calculate the Seismic Design Force (Fp )

Where:

ap = 2.5; the default for cooling towers and closedcircuit coolers

SDS = 0.9966; as calculated in Step 1

Wp = 1.0; the default for cooling towers and closedcircuit coolers

Rp = 2.0; the default for isolated equipment

Ip = 1.5; the default for life safety components

z/h = 1.0; the default for units on a rooftop

In order to meet Code requirements, the unit and its an-chorage must be constructed to withstand 2.24 g. Thiswill require that the upgraded structure option be chosento meet the seismic requirements of this project. Becausethe seismic load requires the upgraded structural design,the wind load calculation results will not change the de-sign and are not required for this analysis.

Wind Load Calculations

The data required to calculate the wind load are:

SDS (Fa)(Ss)= 23 (1.0)(1.495)=0.9966=23

FP 1+2zh

= =0.4 (aP)(SDS)(WP) (1+2(1))=2.24g

RPIP( )

0.4 (2.5)(0.9966)(1)2.0

1.5( )( )

SDS (Fa)(Ss)= 23


17

Basic Wind Speed (V) Numerical value, in miles perhour (mph) found in ASCE 7-05 Figures 6-1 (A,B,C).

Wind Directionality Factor (Kd) 0.85 for buildingcomponents and cladding. Table 6-4 of ASCE 7-05 pro-vides additional information.

Occupancy Category I, II, III or IV depending on thenature of the building occupancy. Table 1604.5 in the IBC2006 Code Book defines each of the categories in detail.This is the same Occupancy Category used in Seismic cal-culations.

Importance Factor (I) Numerical value between 0.77and 1.15 based on the Basic Wind Speed and the Occu-pancy Category. These values are found in Table 6-1 ofASCE 7-05.

Exposure Category B, C or D as defined in Section6.5.6.3 of ASCE 7-05.

Component Elevation (z) The anchorage height ofthe unit in feet.

Nominal Height of the Atmospheric Boundary Layer(zg) - Numerical value based on Exposure Category. Thesevalues are found in Table 6-2 of ASCE 7-05.

3 second Gust-Speed power Law Exponent () - Nu-merical value based on Exposure Category. These valuesare found in Table 6-2 of ASCE 7-05.

Velocity Pressure Exposure Coefficient (Kz) A calcu-lated value using the values for zg and .Topographic Factor (Kzt) 1.0 default when topo-graphic effects are not a factor. ASCE 7-05 Section 6.5.7provides additional detail on topographic factors.

Velocity Pressure (qz) This number in pounds persquare foot (psf) is calculated using the factors describedabove. The New AT is offered with a choice of two struc-tural design packages, consisting of:

Standard Structural Design - up to 60 psf Upgraded Structural Design - up to 145 psf (the

maximum value for North America)

Wind Load Sample Calculation

The following example demonstrates the procedure todetermine which structural design package a Condo-minium Building located in Miami, FL (zip code 33101)would require under the latest version of IBC. In this ex-

ample, the cooling tower will be installed on the top of

the 60 foot tall building.

Step 1: Calculate the Exposure Category Coefficient (Kz)

Where:

z = 60; Installation Height

zg = 700; from ASCE 7-05 Table 2 using an ExposureCategory of D.

= 11.5; from ASCE 7-05 Table 2 using an Exposure

Category of D.

Step 2: Calculate the Velocity Pressure (qp)

Where:

Kz = 1.31; as calculated above.

Kzt = 1.0; default when topographic effects are not afactor.

Kd = 0.85; default for building components andcladding.

V = 145; wind speed from ASCE 7-05 Figure 6-1.

I = 1.0; Based on an Occupancy Category of II.

In order to meet Code requirements, the unit and its at-tachments must be designed and constructed to with-stand 59.93 psf. This means that the standard ATconstruction design will meet the wind load requirementsof this project. Because the wind load does not requirethe upgraded structural design, the seismic load calcula-tion must also be completed to determine if the resultswill change the unit design.

( )KZ = 2.01 a2z

zg( )

( )( )KZ = 2.01 a2 2

11.5zzg( ) = 2.01 = 1.3160700( )

qp = 0.00256(Kz)(Kzt)(Kd)(V2)(I) =

0.00256(1.31)(1.0)(0.85)(1452)(1.0) = 59.93psf



18


Notes:

19 Mark owned by the Cooling Technology Institute

TECHNOLOGY FOR THE FUTURE, AVAILABLE TODAY!

UT


20

SU P E R LO W SO U N D FA N

Solutions for Sound Sensitive ApplicationsThe ULTRA-QUIET Cooling Tower comes standard with Super Low Sound Fan that reduces the overall sound generatedfrom the top of the cooling tower. The ULTRA-QUIET cooling tower provides deep sound reductions and can be used incombination with Water Silencers to produce the lowest sound levels commercially available. Consult EVAPCO's iESselection software for unit sound levels. If a detailed analysis or full octave band datasheet is required for your applica-tion, please consult your EVAPCO Sales Representative.

The Super Low Sound FanReduced Sound Levels versus Model AT Standard FanEVAPCO's Super Low Sound Fan on the ULTRA-QUIET cooling tower utilizes an extremely wide chord blade designavailable for sound sensitive applications where the lowest sound levels are desired. The fan is one piece molded heavyduty FRP construction utilizing a forward swept blade design. The Super Low Sound Fan reduces sound levels 9 to 15dB(A) compared to the Model AT standard fan.

Narrow Band Spectrum Analysis

Frequency (Hz)

Sou

nd

Pre

ssu

re L

evel

(d

B)

Standard Axial Fan

Super Low Sound Fan

Blade Passing FrequenciesBlade Passing FrequenciesBlade Passing FrequenciesImproved Sound Quality versusModel AT Standard Fan

The SUPER Low Sound Fan on the ULTRA-QUIET cooling towerreduces sound levels 9-15 dB(A) and eliminates audible bladepassing frequencies indicative of straight bladed axial type fans.

Refer to the Narrow Band Spectrum graph which shows howstraight bladed axial fans produce blade passing frequencies the same phenomena that produce the signature pulsatinghelicopter noise.

The blade passing frequencies are audible spikes in soundpressure levels, but are not apparent in the octave bandsound spectrum.

Family of Super Low Sound Fans

10 dB(A) decrease is half as loud! The ULTRA-QUIET tower reduces noise pollution by more than 50%.(Refer to Sound Basics on Page 21)

The Super Low Sound Fan on the ULTRA-QUIET Cooling Tower reduces sound levels and betters the sound quality!


21

SO U N D BA S I C S

SoundSound is the alteration in pressure, stress, particle displace-ment and particle velocity, which is propagated in an elasticmaterial. Audible sound is the sensation produced at the earby very small pressure fluctuations in the air.

Sound PressureSound pressure is the intensity of sound. Sound pressure, Lpin decibels is the ratio of measured pressure, P in the air to areference sound pressure, PO = 2x105 Pascal following thefollowing formula:

Lp (dB) = 10 log10 ( P2/ PO2)

The most important point to understand about soundpressure level is that sound pressure level is what isactually being measured when sound data isrecorded. Microphones that measure sound are pressuresensitive devices that are calibrated to convert the soundpressure waves into decibels.

Sound PowerSound Power is the energy of sound. Sound power, Lw indecibels is the ratio of the calculated sound power, W toa reference power, Wo =1 picowatt, according to thefollowing formula:

Lw (dB) = 10 log10 (W/Wo)

The most important point to remember about soundpower level is that sound power level is not a meas-ured value, but is calculated based on the measuredsound pressure.

Adding Multiple Sound SourcesSince the decibel is a logarithmic function, the numbers arenot added linearly. Therefore, two 73 dB sound sourcesadded together do not equal 146 dB. The resultant soundwould actually be 76 dB. The following table shows how toadd decibels from two sound sources.

Difference in Add to the higherdB Level dB Level

0 to 1 32 to 3 24 to 8 1

9 or greater 0

25Ft. Candles

50

100 ft. 100 ft.25 ft.0

25 ft.50 ft. 50 ft.

Ft. Candles100

Ft. Candles

SOUND PRESSURE

76 dB(A)

73 dB(A) 73 dB(A)

100W

SOUND POWER

Similar to the wattage of a light bulb that does notchange the farther one is away from the light bulb,sound power does not vary with distance.

Similar to the intensity coming from a light bulbwhich gets dimmer as one gets further and furtheraway, sound pressure decreases in decibels as yourear gets further from the sound source.

Background in Sound Basics


22

SO U N D BA S I C S

Sound Science and Cooling Towers

dB(A) Formula and Conversions:

f=8000

dB(A) =10 log10 10 ((dB+Cf) /10)

f=63

Typical Sound Pressure Levels ofWell Known Noises:

Jet Airplane, 150 feet away 140 dB(A)Painful 130 dB(A)Very Uncomfortable 120 dB(A)Circular Saw 110 dB(A)Nightclub 100 dB(A)Semi Truck 90 dB(A)Sidewalk of a Busy Road 80 dB(A)Household Vacuum, 3 feet away 70 dB(A)Normal Conversation 60 dB(A)Inside Average Home 50 dB(A)Quiet Library 40 dB(A)Bedroom at Night 30 dB(A)

WaterNoise

Fan Noise

High FrequencySelf Attenuating

Low-Mid FrequenciesTravel through andaround Obstructions

Sound Frequency

Fan Noise Low / Mid frequencies that travel long distances,

through walls, and around obstructions.

Very difficult to attenuate. Reduce fan noise by usingLow Sound Fans.

Dominates what is measured and heard at thecooling tower and at the sound sensitive location.

Water Noise High frequencies that attenuate naturally with

distance. Attenuated easily by walls, trees orother obstructions.

Totally masked and drowned out by fan noise at ashort distance away from the cooling tower.

Notable Facts about Sound:

+/- 1 dB(A) is inaudible to the human ear Decreasing a noise source by 10 dB(A) sounds half as

loud to the human ear

Sound Pressure The A-Weighted ScaleThe A-weighted scale, dB(A) is a means to translate what a sound meter microphone

measures to how the human ear perceives the sound.

where: Cf = correction factor per banddB = measured sound pressure

let: Zf = (dB + Cf)/10

Band Center Frequency Sample Cf ZfFreq. (Hz) Range (Hz) Data (dB) (dB)

1 63 44-88 68 -26.2 4.18

2 125 89-175 76 -16.1 5.99

3 250 176-350 77 -8.6 6.84

4 500 351-700 73 -3.2 6.98

5 1000 701-1400 70 0 7.00

6 2000 1401-2800 68 +1.2 6.92

7 4000 2801-5600 71 +1.0 7.20

8 8000 5601-11200 73 -1.1 7.19

Example calculation of the dB(A) formula using the Sample Data above.

dB(A) = 10 log10 10(Z1) + 10(Z2) + 10(Z3) + 10(Z4) + 10(Z5) + 10(Z6) + 10(Z7) + 10(Z8)

= 10 log10 (67114245.2) = 78.3 dB(A)


23

SP E C I F Y I N G SO U N D

Specifying SoundA Performance Specification

Specify sound pressure in dB(A) measured 5 feet above the fandischarge during full speed operation. All manufacturers can meet a performance specification with Low Sound Options Fan noise is what matters. 5 feet above the fan is where it matters.

Measurement LocationPer Cooling Technology Institute Standard ATC-128

Sound Microphone location 5 feet above the cooling tower fan cowl edge at a45 angle.

This position assures accurate sound measurements by eliminating a source ofuncertainty by taking the microphone out of the high velocity fan discharge air.

Easy VerificationAt 5 feet from the cooling tower, a sound meter records only cooling tower noise. Interested parties can easily verify theactual noise coming from the cooling tower against the specified sound data with good certainty.

If sound were specified at 50 feet or some greater distance from thesound sensitive location, there is increased uncertainty in the measureddata due to other possible sound sources within the 50 foot radius of thesound microphone.

Sound QualitySound coming from the top of the cooling tower is comprised of low-and mid-frequency fan noise. Low- and mid-frequency fan rumble isvery difficult to attenuate. Fan rumble travels through everything andaround everything and what is audible at any sound sensitive location.

Sound coming from the sides of the cooling tower is comprised of highfrequency water noise, which is much less objectionable than fan noiseand attenuates naturally with distance.

Acoustical Shadow*Subjective reactions to the overall noise generated by coolingtowers indicate that as one walks away from a tower intake, apoint is reached where the water noise is masked by the fan noise.The point coincides with the point at which one emerges from theacoustical shadow of the tower structure, which shields intakewater noise from discharge fan noise.*Seelbach & Oran, What To Do About Cooling Tower Noise,Industrial Acoustics Company.

Sound measured at the side of a cooling tower is inside theacoustical shadow of the noise emitted from the top. Outsidethe acoustical shadow, the low- and mid-frequency fan noisecompletely masks the high frequency water noise.

45

MicrophoneLocation

5

WaterNoise

Fan Noise

High FrequencySelf Attenuating

Low-Mid FrequenciesTravel through andaround Obstructions

AcousticalShadow

Microphone

NewCoolingTower

RooftopAir

Handler

ExistingCoolingTower

RoadTraffic

50 Feet

50 Feet

50 Feet

50 Feet

50 Feet

50 Feet50 Fe

et

50 Fe

et

50 Fe

et

50 Fe

et

50 Fe

et

50 Fe

et

Specify fan noise because it matters! Specify fan noise where it matters!


24

Notes:

25

MADE IN USA

USS


26

A 100% CORROSION-RESISTANT DESIGN

EVAPCO, Inc., continues to set the standard in the cooling towerindustry with the Ultra-SST. The Ultra-SST is the finest factoryassembled cooling tower ever offered. It is the ONLY ALL StainlessSteel cooling tower offered with a Type 316 SS basin ASSTANDARD! Constructed of the highest quality materials, theUltra-SST provides the Ultimate in corrosion protection.

Type 304 Stainless Steel Upper casing and structure Mechanical equipment support Fan Cowl and Fan Guard

PVC Patented EVAPAK Fill Water distribution system Air inlet louvers Drift eliminators

Type 316 Stainless Steel Cold water basin Vertical support columns Air inlet louver frames

EVAPCO offers the Ultra-SST cooling tower with a standard Type 316 stainlesssteel cold water basin. Since the cold water basin provides the structural supportfor the unit and is the area most susceptible to corrosion, it is constructed withthe highest quality materials. The Ultra-SST is the ONLY cooling tower in theindustry that offers this protection as standard.

The chemical compositions of Type 304 and 316 stainless steel are similar.However, there are several differences in their makeup that allow Type 316 SS tohave better corrosion resistance than Type 304 SS. Type 316 SS containsmolybdenum (304 SS does not) and has a greater percentage of nickel than Type304 SS. The molybdenumbearing Type 316 SS provides superior corrosionresistance to a wide variety of environments. Also, resistance of stainless steels topitting and/or crevice corrosion in the presence of chloride or other halide ions isenhanced by molybdenum content. A measure of pitting resistance is expressedby the PREN (Pitting Resistance Equivalent, including Nitrogen) calculation. TheType 316 SS PREN of 24 is considerably higher than the Type 304 SS PREN of 19,reflecting the better pitting resistance provided by Type 316 SS due to itsmolybdenum content.

It is generally accepted that Mo-bearing Type 316 SS material can accommodatewater with chloride content ten times greater than Type 304 SS. Furthermore,Type 316 SS eliminates the aesthetic degradation associated with staining of Type304 SS. Dont settle for lesser Series 300 stainless steel! Type 316 SS materialoffers the best protection against corrosion.

Once again, EVAPCO raises the quality standard in the cooling tower industrywith the Ultra-SST!

The Ultra-SST is a 100% corrosion-resistant coolingtower constructed of stainless steel. The premiumcomponents include:

Complete 316 SS Construction Available

For a small price addition, the Ultra-SST can be upgraded tocomplete Type 316 SS construction.

Certified-Standard 201 Independent Certification. No costly field performance

tests required.

Smooth Flow Fan Soft-connect blade to hub design. VFD-friendly. Eliminates critical blade passing

frequencies at any speed.


27

Exclusive 5 Year Complete Product Warranty Covers the complete drive system, including the motor,

on belt or gear drive units. Covers the complete cooling tower from the cold water

basin to the fan discharge screen. Standard on all Ultra-SST Models.

Optional Motor Davit and Working PlatformMotor Davit Motor davit and bracket option for easy motor removal. Also available for Gearbox removal.Platform Platform and ladder arrangement available as an option. Provides additional working surface for the service mechanic.

COMPLETE STAINLESS STEEL CONSTRUCTION

Available in 55 Cross Sections and a capacity range of 32 to 4120 NominalTons (139 to 18,114kW)! The Ultra-SST has a model for every application.

Consult the iES EquipmentSelection Program for Selectionsand Technical Assistance includingApplications, Layout, andStructural Steel Support.

If there is an application for whichthe standard catalog product linedoes not work, EVAPCO will makea cooling tower that will fit yourrequirement!

EEXXCCLLUUSSIIVVEE

304

SS C

asin

g

EVAPCO unequivocallyguarantees the thermalperformance of theUltra-SST cooling towerproduct line.

316

SS B

asin

Quick Release Louver Fasteners New design allows quick removal of louvers. Louver fastener is large and easy to release. Louver fastener remains on the uniteliminating

the possibility of missing hardware.

Water Distribution System Non-corrosive PVC construction with new EvapJet

nozzles. Large 1 wide orifice nozzles prevent clogging and are

threaded for easy removal and positive positioning. 66% fewer nozzles! System branches have threaded end caps to assist

with debris removal.

NEW! EvapJet Nozzle


28

ME C H A N I C A LSP E C I F I C AT I O N S

SECTION 23 65 00 FACTORY-FABRICATED COOLING TOWERSPART 1 GENERAL1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, includ-ing General and Supplementary Conditions and Division1 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 andmaintenance instructions, and thermal performanceguarantee by the manufacturer.

1.4 QUALITY ASSURANCEA. Verification of Performance:

1. Test and certify cooling tower thermal performance ac-cording to CTI Standard 201.2.Test and certify cooling tower sound performance ac-cording 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 war-ranty against materials and workmanship includingmotor, fan, bearings, mechanical support, sheaves, bush-ings and belt.

B. Unit (AT & UT): One (1) year from start-up, not to exceedeighteen (18) months from shipment on the unit.

C. Unit (USS): Five (5) year comprehensive warranty againstmaterials and workmanship for complete unit.

PART 2 - PRODUCTS2.1 MANUFACTURERS

A. Manufactures: Subject to compliance with requirements,provide cooling towers manufactured by one of the fol-lowing:1. EVAPCO, Inc.2. Approved Substitute

2.2 MATERIALSA. 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 TOWERSA. Description: Factory assembled and tested, induced draft

counterflow cooling tower complete with fill, fan, lou-vers, accessories, and rigging supports.

B. Cooling Tower Characteristics and Capacities: Refer to theCooling Tower schedule.

C. Fan(s):1. Type and Material (AT & USS): Axial propeller, individ-ually adjustable wide chord blade extruded aluminuminstalled in a closely fitted cowl with venturi air inlet formaximum efficiency, covered with a heavy gauge hotdipped Galvanized (AT) or Stainless Steel (USS) fanguard.2. Type and Material(UT): Axial propeller, one piece heavyduty FRP hub and blade construction. Galvanized steelclosely fitted fan cowl with venturi air inlet for maximumfan efficiency, covered with a heavy gauge hot dip galva-nized steel fan guard. (Optional Type 304 stainless steel)3. Maximum sound pressure level of _____dB(A) meas-ured at 5 feet above the fan discharge during full speedoperation in accordance with CTI Standard ATC-128.

D. Water Distribution System: Non-corrosive materials.1. Evenly distribute of water over fill material with pres-surized spray tree.

a. Pipes: Schedule 40 PVC, Non-corrosive Materialsb. Nozzles: Non-clogging, ABS Plastic, threaded intobranch 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 latestedition of the International Building Code (IBC) Regula-tions for seismic loads up to _____ g or wind loads up to__ psf.

F. Collection Basin Material: Galvanized Steel (AT/UT Type304 Stainless Steel Optional) or Type 316 Stainless Steel(USS):1. Removable stainless-steel strainer with openingssmaller than nozzle orifices.2. Joints: Bolted and sealed watertight or welded.3. Overflow, makeup and side drain connections4. Flume plate between cells (for multiple-cell units) orEqualizer connection (for multiple-cooling-tower system).

G. Casing: Galvanized Steel (AT/UT) or Type 304 StainlessSteel (USS Type 316 Stainless Steel Optional):1. Casing panels shall totally encase the fill media toprotect the fill from damage due to direct atmosphericcontact.2. Fasteners: Corrosion resistance equal to or better thanmaterials being fastened.3. Joints: Sealed watertight.4. Welded Connections: Continuous and watertight

H. Fill Media: PVC; resistant to rot, decay and biological at-tack; formed, crossfluted bonded together for strengthand durability in block format for easy removal and re-placement; suitable for use as a working surface; self extin-guishing with flame spread rating of 5 per ASTM E84-81a;able to withstand continuous operating temperature of130F; and fabricated, formed and installed by the manu-facturer 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 re-moval; designed Sight Tight to completely block directsunlight from entering and water from splashing out ofthe cooling tower.

K. Water Level Control: Brass mechanical makeup watervalve and plastic float with an adjustable linkage.

2.4 MOTORS AND DRIVESA. General requirements for motors are specified in Division

15 Section Motors.B. Enclosure Type: TEAO or TEFCC. 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 driveconfiguration.

E. Drive: Power Band Belt designed for 150% of the motornameplate HP.1. Belt: Mutli-groove, solid back V-belt type neoprene re-inforced with polyester cord.2. Sheaves: Aluminum alloy if located inside theairstream.3. Bearings: Heavy duty, self-aligning pillow block bear-ings with lubrication lines extended to side access door.Minimum L10 life for bearings shall be 75,000 hours. Pro-vide extended grease lines and fittings.4. Vibration Cutout Switch: Mechanical switch to de- ener-gize fan motors if excessive vibration in NEMA 4 enclosure.

2.5 MAINTENANCE ACCESSA. Internal Working / Service Platforms: Provide a complete

internal working platform and ladder system for serviceof all drive components. A suitable working platformmay be constructed of the fill media for counterflowcooling towers. If a crossflow tower is used, provide aninternal walkway with ladder and elevated working plat-form to allow for service and maintenance to motor anddrive assembly.

B. Handrails/Grabrails: Galvanized steel pipe complying with29 CFR 1910.23. If access to fan deck is required, supply aperimeter handrail with ladder from grade to fan deck.

C. Ladders: Aluminum, sloped ships type with grabrail orvertical complying with 29 CFR 1910.27.

29

EN

GIN

EER

ING

DA

TA

THERMAL PERFORMANCE

MODELS: AT/USS 14-64 to 14-96Thermal performance certified by the Cooling TechnologyInstitute (CTI) in accordance with CTI Standard STD-201

TOWER CAPABILITY IN USGPM AT THE FOLLOWING TEMPERATURE CONDITIONS (F)EWT 90 95 90 95 90 95 90 95 95 100

Motor LWT 80 80 80 80 80 80 80 80 85 85Model No. Hp WB 66 66 68 68 70 70 72 72 75 75AT 14-64 2 131 101 121 92 106 81 91 70 122 94AT 14-74 2 145 114 134 105 119 94 104 83 136 107AT 14-84 3 154 120 142 110 125 98 108 85 144 112AT 14-94 3 167 133 155 123 139 111 122 99 157 126AT 14-66 3 226 175 208 160 183 142 158 124 211 164AT 14-76 3 245 195 228 181 204 162 179 144 230 184AT 14-86 5 264 208 244 191 217 171 189 151 247 195AT 14-96 5 282 227 263 211 236 191 208 171 266 215


Motor LWT 85 85 85 87 85 85 85 86 85 85Model No. Hp WB 76 76 78 78 78 78 80 80 80 80AT 14-64 2 115 89 98 122 76 95 78 103 61 81AT 14-74 2 128 102 111 135 89 108 90 117 74 94AT 14-84 3 135 106 116 143 92 113 94 123 75 97AT 14-94 3 148 119 130 156 105 126 107 136 88 111AT 14-66 3 198 155 170 210 134 165 137 179 109 142AT 14-76 3 218 175 191 230 154 185 157 200 129 162AT 14-86 5 233 185 202 246 162 196 165 213 134 171AT 14-96 5 252 205 222 265 181 216 184 232 153 190

To Make a Selection:Locate the column with the desired operating temperature conditions. Read down the column until you find the GPM equal to or greater than the flowrequired. Read horizontally to the left to find the model number of the unit that will perform the duty. For selections and conditions other than thosestated, consult your iES Selection Program or local EVAPCO representative.


ENGINEERING DATA & DIMENSIONS

31

NOTE: (1) An adequately sized bleed line must be installed in the cooling tower system to prevent build-up of impurities in the recirculated water.(2) Do not use catalog drawings for certified prints. Dimensions are subject to change.(3) Connections larger than 3 are Beveled for Welding (BFW) and grooved for a mechanical coupling.(4) Adequate spacing must be allowed for access to the cooling tower.

Height includes fan guard which ships factory mounted. Outlet connection extends 3 beyond bottom flange.

Weights (LBS) DimensionsFan Air

Model Heaviest Motor FlowNo. Shipping Operating Section (HP) (CFM) H T B P L F

AT 14-64 1080 1760 L 560 2 9,583 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 3' 11-3/4" 12-7/8"AT 14-74 1160 1840 L 640 2 9,419 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 3' 11-3/4" 12-7/8"AT 14-84 1130 1810 U 570 3 10,886 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 3' 11-3/4" 12-7/8"AT 14-94 1210 1890 L 640 3 10,682 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 3' 11-3/4" 12-7/8"AT 14-66 1390 2460 L 730 3 15,295 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 5' 11-3/4" 12-7/8"AT 14-76 1490 2560 L 830 3 15,013 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 5' 11-3/4" 12-7/8"AT 14-86 1410 2480 L 730 5 17,978 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 5' 11-3/4" 12-7/8"AT 14-96 1510 2580 L 830 5 17,647 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 5' 11-3/4" 12-7/8"

F

T

B

H

48 1/4 L

38 1/8

19 3/4

24 1/8

4" MPTINLET

4" MPTOUTLET

ACCESSDOOR

2" DRAIN

2"OVERFLOW

1"MAKE-UP

24 1/8

P

ACCESSDOOR

3

L = Lower SectionU = Upper Section

MODELS: AT/USS 14-64 to 14-96One-Cell Cooling Towers

THERMAL PERFORMANCE

MODELS: AT/USS 14-69 to 14-912Thermal performance certified by the Cooling TechnologyInstitute (CTI) in accordance with CTI Standard STD-201


Motor LWT 80 80 80 80 80 80 80 80 85 85Model No. Hp WB 66 66 68 68 70 70 72 72 75 75AT 14-69 (2) 2 304 233 279 213 245 187 210 163 283 218AT 14-79 (2) 2 335 264 310 243 276 217 240 192 314 249AT 14-89 (2) 3 356 277 329 254 290 226 251 198 333 260AT 14-99 (2) 3 386 308 359 285 321 257 282 228 362 291AT 14-612 (2) 3 459 356 423 326 373 289 322 253 429 333AT 14-712 (2) 3 499 397 464 367 414 330 363 293 469 375AT 14-812 (2) 5 536 422 497 389 442 347 384 307 503 397AT 14-912 (2) 5 574 461 535 429 481 388 424 347 540 437


Motor LWT 85 85 85 87 85 85 85 86 85 85Model No. Hp WB 76 76 78 78 78 78 80 80 80 80AT 14-69 (2) 2 265 205 227 282 176 219 180 239 141 187AT 14-79 (2) 2 296 235 258 313 206 250 209 270 170 217AT 14-89 (2) 3 313 245 269 332 213 261 217 284 174 226AT 14-99 (2) 3 343 276 300 362 244 292 248 315 204 256AT 14-612 (2) 3 403 315 346 427 272 335 278 364 222 288AT 14-712 (2) 3 444 356 388 468 313 377 319 406 262 330AT 14-812 (2) 5 475 376 412 501 329 399 335 433 272 347AT 14-912 (2) 5 513 416 451 539 369 439 375 471 312 387




33


Height includes fan guard which ships factory mounted. Outlet connection extends 3 beyond bottom flange.

Weights (LBS) Dimensions ConnectionsFan Air AT/USS

Model Heaviest Motor Flow Water WaterNo. Shipping Operating Section (HP) (CFM) H T B P L Inlet Outlet

AT 14-69 2000 3600 L 1010 (2) 2 21,130 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 8' 11-3/4" 12-7/8" 4" 4"AT 14-79 2160 3760 L 1170 (2) 2 20,767 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 8' 11-3/4" 12-7/8" 4" 4"AT 14-89 2100 3700 U 1090 (2) 3 24,003 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 8' 11-3/4" 12-7/8" 4" 4"AT 14-99 2260 3860 L 1170 (2) 3 23,552 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 8' 11-3/4" 12-7/8" 4" 4"AT 14-612 2530 4700 U 1270 (2) 3 30,937 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 11' 11-3/4" 12-7/8" 6" 6"AT 14-712 2730 4900 L 1460 (2) 3 30,366 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 11' 11-3/4" 12-7/8" 6" 6"AT 14-812 2570 4740 U 1310 (2) 5 36,364 101-5/8" 32-3/8" 5' 9-1/4" 6' 3" 11' 11-3/4" 12-7/8" 6" 6"AT 14-912 2770 4940 L 1460 (2) 5 35,694 113-5/8" 32-3/8" 6' 9-1/4" 7' 3" 11' 11-3/4" 12-7/8" 6" 6"

12 7/8

3

19 3/4

H

24 1/8

4 1/45

24 1/8

48 1/4

B

T

F

P

L

MPT INLET*

MPT OUTLET*

ACCESSDOOR

2" DRAIN

2"OVERFLOW1"

MAKE-UP

ACCESSDOOR

ACCESSDOOR

ACCESSDOOR

3

38 1/8

MODELS: AT/USS 14-69 to 14-912One-Cell Cooling Towers


F

THERMAL PERFORMANCE

MODELS: AT/UT/USS 19-56 to 19-98Thermal performance certified by the Cooling TechnologyInstitute (CTI) in accordance with CTI Standard STD-201


Motor LWT 80 80 80 80 80 80 80 80 85 85Model No. Hp WB 66 66 68 68 70 70 72 72 75 75AT 19-56 5 424 324 389 295 340 259 291 223 394 302AT 19-66 7.5 491 380 452 347 398 308 343 269 458 356AT 19-76 7.5 534 425 496 393 443 352 388 312 502 401AT 19-86 10 578 462 538 428 482 386 424 344 543 437AT 19-96 15 650 525 606 490 546 447 485 404 612 499AT 19-28 5 551 422 506 385 443 339 379 294 512 394AT 19-38 7.5 594 457 546 419 480 370 413 322 553 428AT 19-48 10 634 491 585 450 515 400 444 350 592 461AT 19-58 7.5 642 508 596 469 531 421 464 371 602 479AT 19-68 10 690 549 641 508 573 457 503 406 648 519AT 19-78 10 709 572 661 533 595 485 528 438 668 543AT 19-88 15 752 603 700 560 628 505 553 451 708 571AT 19-98 15 784 633 731 591 658 539 585 487 739 602


Motor LWT 85 85 85 87 85 85 85 86 85 85Model No. Hp WB 76 76 78 78 78 78 80 80 80 80AT 19-56 5 369 284 314 393 243 304 248 332 194 258AT 19-66 7.5 430 336 369 456 290 358 296 389 237 307AT 19-76 7.5 475 381 414 500 335 403 341 434 279 352AT 19-86 10 515 415 451 542 367 439 374 473 308 386AT 19-96 15 581 477 514 611 427 501 434 536 369 446AT 19-28 5 480 371 410 511 318 397 325 433 254 338AT 19-38 7.5 519 403 445 551 348 431 356 469 281 369AT 19-48 10 556 435 478 590 377 463 384 503 308 399AT 19-58 7.5 569 454 496 601 398 482 406 520 330 420AT 19-68 10 614 493 537 647 434 522 442 562 362 457AT 19-78 10 634 518 560 666 464 545 471 584 397 485AT 19-88 15 671 543 590 706 481 574 489 616 405 504AT 19-98 15 701 575 620 737 515 605 523 646 444 538




35


Height includes fan guard which ships factory mounted. Outlet connection extends 3/8 beyond bottom flange.

Weights (LBS) DimensionsFan Air AT/USS UT

Model Heaviest Motor FlowNo. Shipping Operating Section (HP) (CFM) H T B P L

AT 19-56 3060 5100 U 2010 5 26,500 9' 7-3/8" 5' 7-1/8" 4' 1/4" 7' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 19-66 3100 5140 U 2050 7.5 30,200 9' 7-3/8" 5' 7-1/8" 4' 1/4" 7' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 19-76 3300 5340 U 2250 7.5 29,700 10' 7-3/8" 6' 7-1/8" 4' 1/4" 8' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 19-86 3330 5370 U 2280 10 32,500 10' 7-3/8" 6' 7-1/8" 4' 1/4" 8' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 19-96 3620 5660 U 2570 15 36,300 11' 7-3/8" 7' 7-1/8" 4' 1/4" 9' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 19-28 3450 5870 U 2280 5 31,300 9' 7-3/8" 5' 7-1/8" 4' 1/4" 7' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"AT 19-38 3490 5910 U 2320 7.5 35,700 9' 7-3/8" 5' 7-1/8" 4' 1/4" 7' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"AT 19-48 3520 5940 U 2350 10 39,200 9' 7-3/8" 5' 7-1/8" 4' 1/4" 7' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"AT 19-58 3720 6140 U 2550 7.5 35,100 10' 7-3/8" 6' 7-1/8" 4' 1/4" 8' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"AT 19-68 3750 6170 U 2580 10 37,800 10' 7-3/8" 6' 7-1/8" 4' 1/4" 8' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"AT 19-78 4020 6440 U 2850 10 37,800 11' 7-3/8" 7' 7-1/8" 4' 1/4" 9' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"AT 19-88 3810 6230 U 2640 15 43,700 10' 7-3/8" 6' 7-1/8" 4' 1/4" 8' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"AT 19-98 4080 6500 U 2910 15 43,000 11' 7-3/8" 7' 7-1/8" 4' 1/4" 9' 2-1/2" 5' 11-7/8" 1' 7/8" 2' 5-7/8"

L

H

B

T

8' 5-1/2"

9

5 3/8

P

6 BFW/GVDOUTLET

6 BFW/GVDINLET

3 FPTOVERFLOW

3 FPTDRAIN

2 MPTMAKE-UP

50 3/4

3/8

2

23 1/8

14 7/8

6 1/2

3 7/8

50 3/4

21 3/8

ACCESS DOOR

F

30 5/8

Swing Out Radius of Motor Cover

ACCESSDOOR

MODELS: AT/UT/USS 19-56 to 19-98One-Cell Cooling Towers


F

THERMAL PERFORMANCE



Motor LWT 80 80 80 80 80 80 80 80 85 85Model No. Hp WB 66 66 68 68 70 70 72 72 75 75AT 26-517 (2) 5 904 693 830 633 728 559 624 485 841 649AT 26-617 (2) 7.5 985 762 907 698 799 618 689 540 919 714AT 26-717 (2) 7.5 1072 853 996 788 890 708 779 627 1007 805AT 26-817 (2) 10 1160 928 1080 860 968 776 851 691 1091 878AT 26-917 (2) 15 1305 1054 1216 984 1096 897 974 812 1229 1002AT 28-217 (2) 5 1103 845 1013 770 888 678 759 588 1026 789AT 28-317 (2) 7.5 1189 915 1093 838 961 740 827 644 1107 858AT 28-417 (2) 10 1269 983 1170 901 1031 800 890 700 1185 923AT 28-517 (2) 7.5 1285 1017 1193 940 1063 842 928 743 1206 960AT 28-617 (2) 10 1381 1100 1284 1018 1148 915 1006 813 1298 1039AT 28-717 (2) 10 1419 1145 1323 1067 1191 972 1056 876 1336 1087AT 28-817 (2) 15 1505 1208 1402 1120 1258 1011 1108 902 1417 1143AT 28-917 (2) 15 1570 1268 1464 1183 1318 1078 1171 976 1479 1205


Motor LWT 85 85 85 87 85 85 85 86 85 85Model No. Hp WB 76 76 78 78 78 78 80 80 80 80AT 26-517 (2) 5 788 610 674 838 524 653 536 711 421 558AT 26-617 (2) 7.5 863 674 741 916 583 718 594 781 475 617AT 26-717 (2) 7.5 953 764 832 1005 672 809 684 872 559 707AT 26-817 (2) 10 1034 834 906 1089 737 882 750 949 618 774AT 26-917 (2) 15 1167 957 1032 1226 858 1006 871 1075 741 896AT 28-217 (2) 5 962 742 821 1023 636 794 650 867 509 677AT 28-317 (2) 7.5 1039 808 890 1103 697 862 713 939 563 739AT 28-417 (2) 10 1113 870 958 1182 754 928 769 1008 616 799AT 28-517 (2) 7.5 1139 909 992 1203 797 965 812 1041 661 841AT 28-617 (2) 10 1228 987 1074 1295 869 1044 884 1125 726 914AT 28-717 (2) 10 1268 1038 1120 1333 929 1092 943 1169 795 971AT 28-817 (2) 15 1343 1087 1180 1414 963 1148 979 1234 810 1010AT 28-917 (2) 15 1404 1151 1241 1475 1032 1210 1047 1294 888 1077




37

NOTE: (1) An adequately sized bleed line must be installed in the cooling tower system to prevent build-up of impurities in the recirculated water.(2) Do not use catalog drawings for certified prints. Dimensions are subject to change.(3) Connections larger than 3 are Beveled for Welding (BFW) and grooved for a mechanical coupling.(4) Adequate spacing must be allowed for access to the cooling tower.(5) These models are available as (2) independent operating cells with the addition of a flume plate. Consult the factory for details.

Height includes fan guard which ships factory mounted. Outlet connection extends 3/8 beyond bottom flange.

P

17'-1 1/2"

5 3/8

92 1/2

50 3/4

W 3/8

H

B

T

(2) 2 MPT MAKE-UP

(2) 3 FPTOVERFLOW

(2) 3 FPT DRAIN

(2) 6 BFW/GVDOUTLET

(2) 6 BFW/GVDINLET

23 1/8

14 7/8

6 1/2

3 7/8

2 50 3/4

101 1/2 2 1/2

21 3/8

ACCESS DOORACCESS DOOR

F

30 5/8 30 5/8

Swing Out Radius of Motor Cover

ACCESSDOOR

ACCESSDOOR

MODELS: AT/UT/USS 26-517 to 28-917Two-Cell Cooling Towers

Weights (LBS) DimensionsFan Air AT/USS UT

Model Heaviest Motor FlowNo. Shipping Operating Section (HP) (CFM) H T B P W

AT 26-517 6120 10200 U 2010 (2) 5 53,100 9' 11" 5' 7-1/8" 4' 3-7/8" 7' 6-1/8" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 26-617 6200 10280 U 2050 (2) 7.5 60,500 9' 11" 5' 7-1/8" 4' 3-7/8" 7' 6-1/8" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 26-717 6600 10680 U 2250 (2) 7.5 59,400 10' 11" 6' 7-1/8" 4' 3-7/8" 8' 6-1/8" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 26-817 6660 10740 U 2280 (2) 10 65,100 10' 11" 6' 7-1/8" 4' 3-7/8" 8' 6-1/8" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 26-917 7240 11320 U 2570 (2) 15 72,800 11' 11" 7' 7-1/8" 4' 3-7/8" 9' 6-1/8" 5' 11-7/8" 1' 7/8" 2' 1-7/8"AT 28-217 6900 11740 U 2280 (2) 5 62,600 10' 3-3/8" 5' 7-1/8" 4' 8-1/4" 7' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"AT 28-317 6980 11820 U 2320 (2) 7.5 71,400 10' 3-3/8" 5' 7-1/8" 4' 8-1/4" 7' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"AT 28-417 7040 11880 U 2350 (2) 10 78,300 10' 3-3/8" 5' 7-1/8" 4' 8-1/4" 7' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"AT 28-517 7440 12280 U 2550 (2) 7.5 70,200 11' 3-3/8" 6' 7-1/8" 4' 8-1/4" 8' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"AT 28-617 7500 12340 U 2580 (2) 10 76,900 11' 3-3/8" 6' 7-1/8" 4' 8-1/4" 8' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"AT 28-717 8040 12880 U 2850 (2) 10 75,700 12' 3-3/8" 7' 7-1/8" 4' 8-1/4" 9' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"AT 28-817 7620 12460 U 2640 (2) 15 87,500 11' 3-3/8" 6' 7-1/8" 4' 8-1/4" 8' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"AT 28-917 8160 13000 U 2910 (2) 15 86,000 12' 3-3/8" 7' 7-1/8" 4' 8-1/4" 9' 10-1/2" 8' 5-7/8" 1' 7/8" 2' 5-7/8"

F


THERMAL PERFORMANCE



Motor LWT 80 80 80 80 80 80 80 80 85 85Model No. Hp WB 66 66 68 68 70 70 72 72 75 75AT 212-59 (2) 5 904 693 830 633 728 559 624 485 841 649AT 212-69 (2) 7.5 985 762 907 698 799 618 689 540 919 714AT 212-79 (2) 7.5 1072 853 996 788 890 708 779 627 1007 805AT 212-89 (2) 10 1160 928 1080 860 968 776 851 691 1091 878AT 212-99 (2) 15 1305 1054 1216 984 1096 897 974 812 1229 1002


Motor LWT 85 85 85 87 85 85 85 86 85 85Model No. Hp WB 76 76 78 78 78 78 80 80 80 80AT 212-59 (2) 5 788 610 674 838 524 653 536 711 421 558AT 212-69 (2) 7.5 863 674 741 916 583 718 594 781 475 617AT 212-79 (2) 7.5 953 764 832 1005 672 809 684 872 559 707AT 212-89 (2) 10 1034 834 906 1089 737 882 750 949 618 774AT 212-99 (2) 15 1167 957 1032 1226 858 1006 871 1075 741 896

To Make a Selection:Locate the column with the desired operating temperature conditions. Read down the column until you find the GPM equal to or greater than the flowrequired. Read horizontally to the left to find the model number of the unit that will perform the duty. For selections and conditions other than thosestated, consult your iES Sele

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