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Marley MD 5000COUNTERFLOW COOLING TOWER

ENGINEERING DATA

AND SPECIFICATIONS

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MD towers are galvanized steel, actory assembled,

counterlow cooling towers, designed to serve airconditioning and rerigeration systems as well as lightto medium industrial process loads on clean water. TheMarley MD evolved rom a actory-assembled concepto towers pioneered by Marley some 75 years ago, andincorporate all o the design advancements that ourcustomers have ound valuable. MD towers represent thecurrent state o the art in this cooling tower category.

The speciications portion o this publication not onlyrelates the language to use in describing an appropriateMD cooling towerbut also denes why certain items andeatures are important enough to speciy with the intention

o insisting upon compliance by all bidders. The let handcolumn o pages 36 thru 49 provides appropriate text orthe various specication paragraphs, whereas the righthand column comments on the meaning o the subjectmatter and explains its value.

Pages 36 through 40 indicate those paragraphs which will

result in the purchase o a basic cooling towerone thataccomplishes the specied thermal perormance, but whichwill lack many operationand maintenance-enhancingaccessories and eatures that are usually desired by thosepersons who are responsible or the continuing operationo the system o which the cooling tower is part. It will alsoincorporate those standard materials which testing andexperience has proven to provide acceptable longevity innormal operating conditions.

Pages 41 through 49 provide paragraphs intended toadd those eatures, components, and materials thatwill customize the cooling tower to meet the users

requirements.

MD Steel Cooling Tower 2

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WATER DISTRIBUTION SYSTEM

Pressurized spray system distributes water evenly over the ll

Low-clog polypropylene nozzlesdeliver precise distribution o water over the ll area

Marley MC thermoormed PVC lm ll assembled into packs or ease o removal and cleaning

Marley XCEL drit eliminatorslimit drit losses to no more than .001% o the design fow rate

STRUCTURE

Induced-drat, counterfow design may require less plan area than crossfow towers typically use

Series 300 stainless steel, 316 stainless steel or heavy mill galvanized steel construction

Factory assembledensures nal eld installation will be hassle-ree

Triple-pass PVC inlet louverslimit splash-out and eliminate sunlight rom entering the collection basin

AIR MOVEMENT PACKAGE

High eciency anwide-chord design or maximum eciency at low an tip speeds

Eased inlet an cylinderensures ull area, low turbulent airfow through the cylinder

Spherical roller bearings are rated at an L10 lie o 100,000 hours

TEFC Fan Motor1.15 service actor, variable torque, and specially insulated or cooling tower duty

The MD Series air movement package including the structural supportguaranteed against ailure or a

period o ve ull years.

MD Steel Cooling Tower 3

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Engineering Data

Schematic 6Support 30Outlet Connection 32Hoisting Ino 33Freeze Prevention 34Water Quality 35

Speciications / Base

Base 36Thermal Perormance 36Perormance Warranty 36Design Loading 37Construction 37Mechanical Equipment 38Fill, Louvers and Drit Eliminators 39Hot Water Distribution System 39Casing and Fan Guard 40Access 40Collection Basin 40Warranty 40

Speciications / Options

Stainless Steel OptionsStainless Steel Collection Basin 41All Stainless Steel Cooling Tower 41

Convenience and Saety OptionsMechanical Access Platorm 42Ladder Extension 42Ladder Saety Cage 42Motor Davit 42Motor and Fan Davit 43

Control OptionsFan Motor Starter Control Panel 43Vibration Limit Switch 44Basin Heater 44Water Level Control 44Fan Motor All Weather Variable Speed Drive 45Fan Motor Premium Variable Speed Drive 46

Miscellaneous OptionsEqualizer Flume Weir Gates 47Sound Control 48Splash Attenuation 48

Outlet Sound Attenuation 48Ultra Quiet Fan 49

MD Steel Cooling Tower Table o Contents 4

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MD Steel Cooling Tower Operational and Environmental Awareness 5

C A U T I O NThe cooling tower must be located at such distance

and direction to avoid the possibility o contaminated

discharge air being drawn into building resh air

intake ducts. The purchaser should obtain the

services o a Licensed Proessional Engineer or

Registered Architect to certiy that the location o

the cooling tower is in compliance with applicable air

pollution, ire and clean air codes.

SYSTEM CLEANLINESS

Cooling towers are very eective air washers. Atmospheric dustable to pass through the relatively small louver openings will enterthe circulating water system. Increased concentrations can intensiysystem maintenance by clogging screens and strainersand smallerparticulates can coat system heat transer suraces. In areas o lowlow velocitysuch as the cold water basinsedimentary depositscan provide a breeding ground or bacteria.

In areas prone to dust and sedimentation, you should considerinstalling some means or keeping the cold water basin clean. Typicaldevices include side stream ilters and a variety o iltration media.

WATER TREATMENT

To control the buildup o dissolved solids resulting rom waterevaporation, as well as airborne impurities and biological contaminantsincluding Legionella, an eective consistent water treatment programis required. Simple blowdown may be adequate to control corrosionand scale, but biological contamination can only be controlled withbiocides.

An acceptable water treatment program must be compatible withthe variety o materials incorporated in a cooling towerideally thepH o the circulating water should all between 6.5 and 9.0. Batcheeding o chemicals directly into the cooling tower is not a goodpractice since localized damage to the tower is possible. Speciicstartup instructions and additional water quality recommendationscan be ound in the MD User Manual which accompanies the towerand also is available rom your local Marley sales representative. Forcomplete water treatment recommendations, consult a competent,qualiied water treatment supplier.

TYPICAL APPLICATIONS

The MD tower is an excellent choice or normal applicationsrequiring cold water or the dissipation o heat. This includescondenser water cooling or air conditioning, rerigeration, andthermal storage systems, as well as their utilization or ree-coolingin all o those systems. The MD can also be used in the coolingo jacket water or engines and air compressors, and are widelyapplied to dissipate waste heat in a variety o industrial, power andmanuacturing processes.

Choosing the all stainless steel construction option, the MDcan be conidently applied in unusually corrosive processes andoperating environments. However, no single product line can answerall problems, and selective judgement should be exercised in theollowing situations

APPLICATIONS REqUIRING ALTERNATIVE COOLINGTOWER SELECTIONS

Certain types o applications are incompatible with anycooling tower with ilm illwhether MD or a competitive tower osimilar manuacture. Film ill is subject to distortion in high watertemperatures, and the narrow passages are easily clogged by turbidor debris-laden water. Some o the applications, which call oralternative tower designs are:

Water temperatures exceeding 52Cadversely aects theservice lie and perormance o normal counterlow PVC ill.Higher temperature ill materials are available.

Ethylene glycol contentcan plug ill passages as slime andalgae accumulate to eed on the available organic materials.

Fatty acid contentound in processes such as soap anddetergent manuacturing and some ood processingatty acidspose a serious threat or plugging ill passages.

Particulate carry overoten ound in steel mills and cementplantscan both cause ill plugging, and can build up topotentially damaging levels on tower structure.

Pulp carry overtypical o the paper industry and oodprocessing where vacuum pumps or barometric condensers areused. Causes ill plugging which may be intensiied by algae.

ALTERNATIVE SELECTIONS

In addition to the MD, SPX Cooling Technologies oers a ullscope o products in various designs and capacities to meet thespecial demands o speciic applications.

spxcooling.comvisit us on the web or a complete list oproducts, services, publications and to ind your nearest salesrepresentative.

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MD Steel Cooling Tower Engineering Data: Schematic 6

H

A

569

140

2578

2731 35

8" INLET MOTOR

CL

PLAN

SIDE ELEVATION END ELEVATION

Use this data or preliminary layouts only. Obtain

current drawing rom your Marley sales representative.

UPDATE web-based selection sotware, available

at spxcooling.com/update provides MD model

recommendations based on customer's speciicdesign requirements.

MD5008 SINGLE CELL

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A Sound dBA Approach

Various low sound options are available or up to

16 dB reduction rom the standard dBA options

in the schematic data table. Consult UPDATE

selection sotware or perormance, sound levels and

dimensions.

NOTE

1 Use this bulletin for preliminary layouts only.Obtain currentdrawings rom your Marley sales representative. All table data is percell.

2 Last two characters o the model number indicate number o cellsand cell conguration.

3 Nominal tons are based upon 35C HW, 29.5C CW, 25.5C WBand .68 m3/hr per ton. The Marley UPDATE web-based selectionsotware provides MD model recommendations based on specicdesign requirements.

4 Standard overfow is a 3"dia. FPT connection located on theside o the collection basin. Makeup water connection is 2"dia.MPT connection located on the side o the tower. A 3" FPT drainconnection is located on the side o the collection basin.

5 Models with an Ultra Quiet Fan option require a taller an cylinder,add 597mm to this dimension or correct height.

Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg

H note 5 A Weight/CellHeaviest

Section

MD5008KLC1L 149 3.7 79 76

3294 2181 3051 1702 891

MD5008MAC1L 165 5.5 80 80

MD5008NAC1L 179 7.5 81 81

MD5008PAC1L 202 11 81 84

MD5008QAC1L 216 15 81 85

MD5008KLD1L 161 3.7 79 76

3599 2486 3177 1828 936

MD5008MAD1L 180 5.5 80 80

MD5008NAD1L 197 7.5 81 81

MD5008PAD1L 223 11 81 84

MD5008QAD1L 239 15 81 85

MD5008KLF1L 166 3.7 79 76

3904 2791 3302 1953 1062

MD5008MAF1L 189 5.5 80 80

MD5008NAF1L 207 7.5 81 81

MD5008PAF1L 234 11 81 84

MD5008QAF1L 255 15 81 85

MD5008 SINGLE CELL

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H

A

35

MOTOR

CL

PLAN


8" INLET

CL

569

2578

2371

2794140

MD5008 MULTICELL






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MD5008 MULTICELL

Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5008KLC2L 149 3.7 79 76

3526 2413 3072 1723 891

MD5008MAC2L 165 5.5 80 80

MD5008NAC2L 179 7.5 81 81

MD5008PAC2L 202 11 81 84

MD5008QAC2L 216 15 81 85

MD5008KLD2L 161 3.7 79 76

3831 2718 3197 1848 957

MD5008MAD2L 180 5.5 80 80

MD5008NAD2L 197 7.5 81 81

MD5008PAD2L 223 11 81 84

MD5008QAD2L 239 15 81 85

MD5008KLF2L 166 3.7 79 76

4135 3023 3323 1974 1083

MD5008MAF2L 189 5.5 80 80

MD5008NAF2L 207 7.5 81 81

MD5008PAF2L 234 11 81 84

MD5008QAF2L 255 15 81 85






dimensions.

NOTE






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H

A

35

8" INLET MOTOR

CL

PLAN


569

2578

3651

140

MD5010 SINGLE CELL






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dimensions.

NOTE






MD5010 SINGLE CELL

Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5010NLC1L 220 7.5 80 80

3412 2299 3883 2079 1052MD5010PAC1L 248 11 81 84

MD5010QAC1L 269 15 81 85

MD5010RAC1L 286 18.5 81 86

MD5010NLD1L 240 7.5 80 80

3716 8'-6 12" 4046 2242 1190MD5010PAD1L 279 11 81 84

MD5010QAD1L 304 15 81 85

MD5010RAD1L 325 18.5 81 86

MD5010NLF1L 251 7.5 80 80

4021 2908 4234 2430 1353

MD5010PAF1L 293 11 81 84

MD5010QAF1L 317 15 81 85

MD5010RAF1L 341 18.5 81 86

MD5010SAF1L 360 22 81 87

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H

A

35

8" INLET MOTOR

CLCL

PLAN


569

2578

3651

3715

140

MD5010 MULTICELL






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MD5010 MULTICELL

Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5010NLC2L 220 7.5 80 80

3627 2210 3906 2102 1052MD5010PAC2L 248 11 81 84

MD5010QAC2L 269 15 81 85

MD5010RAC2L 286 18.5 81 86

MD5010NLD2L 240 7.5 80 80

3932 2515 4069 2265 1213MD5010PAD2L 279 11 81 84

MD5010QAD2L 304 15 81 85

MD5010RAD2L 325 18.5 81 86

MD5010NLF2L 251 7.5 80 80

4237 2819 4257 2453 1376

MD5010PAF2L 293 11 81 84

MD5010QAF2L 317 15 81 85

MD5010RAF2L 341 18.5 81 86

MD5010SAF2L 360 22 81 87






dimensions.

NOTE






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H

A

3607

3651

35

8" INLET

ACCESS

CL

PLAN


15






MD5016 SINGLE CELL

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selection sotware or perormance, sound levels anddimensions.

NOTE






Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5016NLC1L 284 7.5 78 76

4239 2529 5805 3225 1710

MD5016PAC1L 317 11 79 81

MD5016QAC1L 345 15 80 83

MD5016RAC1L 369 18.5 80 85

MD5016SAC1L 390 22 81 88

MD5016NLD1L 310 7.5 78 76

4543 2986 6089 3508 1763

MD5016PAD1L 350 11 79 81

MD5016QAD1L 383 15 80 83

MD5016RAD1L 410 18.5 80 85

MD5016SAD1L 436 22 81 88

MD5016TAD1L 475 30 82 90

MD5016NLF1L 324 7.5 78 76

4848 3138 6320 3739 1977

MD5016PAF1L 368 11 79 81

MD5016QAF1L 403 15 80 83

MD5016RAF1L 431 18.5 80 85

MD5016SAF1L 460 22 81 88

MD5016TAF1L 500 30 82 90

MD5016 SINGLE CELL

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H

A

3607

3651

371535

8" INLET

ACCESS

CLCL

PLAN


153






MD5016 TWO OR THREE CELL

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NOTE






Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5016NLC2L 284 7.5 78 76

4546 2837 5860 3279 1710

MD5016PAC2L 317 11 79 81

MD5016QAC2L 345 15 80 83

MD5016RAC2L 369 18.5 80 85

MD5016SAC2L 390 22 81 88

MD5016NLD2L 310 7.5 78 76

4851 3142 6143 3563 1800

MD5016PAD2L 350 11 79 81

MD5016QAD2L 383 15 80 83

MD5016RAD2L 410 18.5 80 85

MD5016SAD2L 436 22 81 88

MD5016TAD2L 475 30 82 90

MD5016NLF2L 324 7.5 78 76

5156 3446 6375 3794 2032

MD5016PAF2L 368 11 79 81

MD5016QAF2L 403 15 80 83

MD5016RAF2L 431 18.5 80 85

MD5016SAF2L 460 22 81 88

MD5016TAF2L 500 30 82 90


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H

A

3607

3651

371535

8" INLET

ACCESS

CLCL

PLAN


153






MD5016 FOUR OR MORE CELLS

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NOTE






Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5016NLC4L 284 7.5 78 76

4801 3091 5933 3353 1710

MD5016PAC4L 317 11 79 81

MD5016QAC4L 345 15 80 83

MD5016RAC4L 369 18.5 80 85

MD5016SAC4L 390 22 81 88

MD5016NLD4L 310 7.5 78 76

5105 3396 6217 3636 1874

MD5016PAD4L 350 11 79 81

MD5016QAD4L 383 15 80 83

MD5016RAD4L 410 18.5 80 85

MD5016SAD4L 436 22 81 88

MD5016TAD4L 475 30 82 90

MD5016NLF4L 324 7.5 78 76

5410 3700 6448 3868 2105

MD5016PAF4L 368 11 79 81

MD5016QAF4L 403 15 80 83

MD5016RAF4L 431 18.5 80 85

MD5016SAF4L 460 22 81 88

MD5016TAF4L 500 30 82 90


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A

H

7366

7312

3705

35

8" INLET

ACCESS

CLCL

PLAN


153






MD5016 FOUR CELL QUAD

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NOTE






Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5016NLC4B 284 7.5 78 76

4801 3091 5933 3353 1710

MD5016PAC4B 317 11 79 81

MD5016QAC4B 345 15 80 83

MD5016RAC4B 369 18.5 80 85

MD5016SAC4B 390 22 81 88

MD5016NLD4B 310 7.5 78 76

5105 3396 6217 3636 1874

MD5016PAD4B 350 11 79 81

MD5016QAD4B 383 15 80 83

MD5016RAD4B 410 18.5 80 85

MD5016SAD4B 436 22 81 88

MD5016TAD4B 475 30 82 90

MD5016NLF4B 324 7.5 78 76

5410 3700 6448 3868 2105

MD5016PAF4B 368 11 79 81

MD5016QAF4B 403 15 80 83

MD5016RAF4B 431 18.5 80 85

MD5016SAF4B 460 22 81 88

MD5016TAF4B 500 30 82 90


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MD5018 SINGLE CELL

H

A

35

CL

PLAN


3607

5480

153"

10" OR 12"INLET






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NOTE






6 Dimension shown is or a 10" inlet diameter, add 44mm to thisdimension or a 12" diameter inlet.

Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg

H note 5 A note 6 Weight/CellHeaviest

Section

MD5018NLC1L 376 7.5 79 73

4636 2853 8666 4776 3103

MD5018PLC1L 428 11 79 76

MD5018QAC1L 470 15 79 79

MD5018RAC1L 500 18.5 80 81

MD5018SAC1L 528 22 81 84

MD5018TAC1L 580 30 82 86

MD5018NLD1L 406 7.5 79 73

4940 3158 9043 5153 3479

MD5018PLD1L 466 11 79 76

MD5018QAD1L 516 15 79 79

MD5018RAD1L 552 18.5 80 81

MD5018SAD1L 586 22 81 84

MD5018TAD1L 644 30 82 86

MD5018UAD1L 690 37 82 86

MD5018NLF1L 422 7.5 79 73

5245 3462 9496 5605 3932

MD5018PLF1L 485 11 79 76MD5018QAF1L 540 15 79 79

MD5018RAF1L 575 18.5 80 81

MD5018SAF1L 615 22 81 84

MD5018TAF1L 676 30 82 86

MD5018UAF1L 725 37 82 86

MD5018VAF1L 756 45 82 87

MD5018 SINGLE CELL

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H

A

35

CLCL

PLAN


3607

5480

5545

153

10" OR 12"

INLET






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Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5018NLC2L 376 7.5 79 73

4930 3158 8738 4848 3103

MD5018PLC2L 428 11 79 76

MD5018QAC2L 470 15 79 79

MD5018RAC2L 500 18.5 80 81

MD5018SAC2L 528 22 81 84

MD5018TAC2L 580 30 82 86

MD5018NLD2L 406 7.5 79 73

5245 3462 9115 5225 3479

MD5018PLD2L 466 11 79 76

MD5018QAD2L 516 15 79 79

MD5018RAD2L 552 18.5 80 81

MD5018SAD2L 586 22 81 84

MD5018TAD2L 644 30 82 86

MD5018UAD2L 690 37 82 86

MD5018NLF2L 422 7.5 79 73

5550 3767 9568 5678 3932

MD5018PLF2L 485 11 79 76MD5018QAF2L 540 15 79 79

MD5018RAF2L 575 18.5 80 81

MD5018SAF2L 615 22 81 84

MD5018TAF2L 676 30 82 86

MD5018UAF2L 725 37 82 86

MD5018VAF2L 756 45 82 87







NOTE







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H

A

35

CLCL

PLAN


3607

5480

5545

153

10" OR 12"

INLET







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Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5018NLC4L 376 7.5 79 73

5245 3462 8802 4912 3103

MD5018PLC4L 428 11 79 76

MD5018QAC4L 470 15 79 79

MD5018RAC4L 500 18.5 80 81

MD5018SAC4L 528 22 81 84

MD5018TAC4L 580 30 82 86

MD5018NLD4L 406 7.5 79 73

5550 3767 9178 5288 3479

MD5018PLD4L 466 11 79 76

MD5018QAD4L 516 15 79 79

MD5018RAD4L 552 18.5 80 81

MD5018SAD4L 586 22 81 84

MD5018TAD4L 644 30 82 86

MD5018UAD4L 690 37 82 86

MD5018NLF4L 422 7.5 79 73

5728 4072 9631 5741 3932

MD5018PLF4L 485 11 79 76MD5018QAF4L 540 15 79 79

MD5018RAF4L 575 18.5 80 81

MD5018SAF4L 615 22 81 84

MD5018TAF4L 676 30 82 86

MD5018UAF4L 725 37 82 86

MD5018VAF4L 756 45 82 87







NOTE







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H

A

35

10" OR 12"

INLET

CLCL

CL CL

PLAN


7312

11024

55443705

153






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NOTE







Model

note 2

Nominal Tons

note 3

Motor

kW

dBA

1.5m rom air

inlet ace

dBA

1.5m above

an outlet

Dimensions Design

Operating

Weight

kg

Shipping Weight

kg


Section

MD5018NLC4B 376 7.5 79 73

5245 3462 88023 4912 3103

MD5018PLC4B 428 11 79 76

MD5018QAC4B 470 15 79 79

MD5018RAC4B 500 18.5 80 81

MD5018SAC4B 528 22 81 84

MD5018TAC4B 580 30 82 86

MD5018NLD4B 406 7.5 79 73

5550 3767 9178 5288 3479

MD5018PLD4B 466 11 79 76

MD5018QAD4B 516 15 79 79

MD5018RAD4B 552 18.5 80 81

MD5018SAD4B 586 22 81 84

MD5018TAD4B 644 30 82 86

MD5018UAD4B 690 37 82 86

MD5018NLF4B 422 7.5 79 73

5855 4072 9631 5741 3932

MD5018PLF4B 485 11 79 76MD5018QAF4B 540 15 79 79

MD5018RAF4B 575 18.5 80 81

MD5018SAF4B 615 22 81 84

MD5018TAF4B 676 30 82 86

MD5018UAF4B 725 37 82 86

MD5018VAF4B 756 45 82 87


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MD Steel Cooling Tower Engineering Data: Support 30

DE E

CL ANCHOR

BOLT

CLANCHOR

BOLT

OVERALL OF BASIN

L

C

CLANCHOR

BOLT

CL

ANCHOR

BOLT

WOVERALLWIDTHOFBASIN

HOLES FOR

M16 ANCHOR

BOLTS 4 REQD

21

21

TOWER COLLECTION

BASIN

A

SUPPORTING STEEL

SINGLE CELL

NORMAL

GAUGE

21

SUPPORT

BY OTHERS

TOWER

COLLECTION

BASIN

VIEW A

Model

Dimensions DesignOperating

Weightper cell kg

Design OperatingLoad

at support beamkg/m

W L C D E F

MD5008_C 2578 2731 2537 2629 51 165 3072 563

MD5008_D 2578 2731 2537 2629 51 165 3197 587

MD5008_F 2578 2731 2537 2629 51 165 3323 609

MD5010_C 2578 3651 2537 3550 51 165 3906 550

MD5010_D 2578 3651 2537 3550 51 165 4069 569

MD5010_F 2578 3651 2537 3550 51 165 4257 593

MD5016_C 3607 3651 3566 3550 127 318 5860 909

MD5016_D 3607 3651 3566 3397 127 318 6143 952

MD5016_F 3607 3651 3566 3397" 127 318 6375 983

MD5018_C 3607 5480 3566 5226 127 318 8802 931

MD5018_D 3607 5480 3566 5226 127 318 9178 969

MD5018_F 3607 5480 3566 5226 127 318 9631 1012

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MD Steel Cooling Tower Engineering Data: Support 31

D F EE

CL ANCHOR

BOLT

CLANCHOR

BOLT21

21

OVERALL LENGTH OF BASIN

CL ANCHOR

BOLT

CLANCHOR

BOLT

C

CLANCHOR

BOLT

CL

ANCHOR

BOL

T

WOVERALLWIDTHOFBASIN

TOWER COLLECTION

BASIN

A

HOLES FOR

M16 ANCHOR

BOLTS 4/CELL

SUPPORTING STEEL

MULTICELL

1 Use this bulletin for preliminary layouts only.Obtain currentdrawings rom your Marley sales representative or nal design.

2 Purchaser to provide tower support complete with holes andanchor bolts. Do not use studs! Anchor points must be ramed fushand level at top.

NOTE

3 Design operating weight occurs with collection basin ull tooverfow level. Actual operating weight varies with m3/hr andpiping scheme.

4 Tower may be placed on a fat concrete slab. Side outlet andoptional side drain and overfow must be specied.

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MD Steel Cooling Tower Engineering Data: Outlet Connection 32

A

B

C

D

CL TOWER PUMP

SUCTION

MAKEUP

2" NPTM

MAKEUP

ALTERNATE LOCATION

OVERFLOW

3" NPTF

89

SUCTION HOODWELDING

BEVEL

MECHANICAL

COUPLING GROOVE

REMOVABLE

TRASH SCREEN

23

DRAIN

3" NPTF

SIDE-OUTLET SUCTION CONNECTION

END-OUTLET SUCTION CONNECTION

SIDE-OUTLET SUMP CONNECTION

SUCTION SECTION

SUMP SECTION

BOTTOM OUTLET

CONNECTION

B

CL TOWER

CL SUMP

SUMP FACE MAY

BE ROTATED 90 OR 180

MAKEUP

2" NPTM

MAKEUP

ALTERNATE LOCATION

OVERFLOW

3" NPTF

153

502

ANTI-VOTEX PLATE

WITH SCREEN OR

REMOVABLE

TRASH SCREEN

DRAIN

3" NPTF

DRAIN

11/2" NPTF

OUTLET PIPING

BY OTHERS

CL OUTLETC

D

89

A

C

D

PUMP

SUCTION

MAKEUP

2" NPTM

OVERFLOW

3" NPTF89 496

878

SLOPINGBASIN FLOOR

DRAIN

3" NPTF

Model

Dimensions

Suction

DiameterA B C D

MD5008

6" 492 587 305

8" 191 492 587 305

10" 492 587 305

MD5010

6" 476 587 305

8" 191 476 587 305

10" 476 587 305

MD5016

6" 476 638 330

8" 191 476 638 330

10" 216 476 638 330

12" 476 638 330

MD5018

6" 476 638 330

8" 191 476 638 330

10" 216 476 638 330

12" 231 476 638 330

14" 476 638 330

Maximum m3/hr per Outlet

OutletDiameter

Side or End Suctionpump low

Sumppump low

withoutanti-vortex plate

Sumppump low

with anti-vortex plate orgravity low

with or withoutanti-vortex plate

Bottom Outletpump low

withoutanti-vortex plate

Bottom Outletpump low

with anti-vortex plate orgravity low

with or withoutanti-vortex plate

MD5008 MD5010 MD5016 MD5018 MD5008 MD5010 MD5016 MD5018 MD5008 MD5010 MD5016 MD5018 MD5008 MD5010 MD5016 MD5018 MD5008 MD5010 MD5016 MD5018

6" 143 143 204 204 204 204

8" 267 311 354 354 248 248 248 248 267 311 354 354 136 136

10" 533 558 267 311 391 391 267 311 533 558 100 100 214 214 214 214

12" 684 533 555 533 684 143 143 267 304 304 304

14" 671 173 173 173 267 311 367 367

16" 684 225 225 225 225 267 311 480 480

18" 267 285 285 285 267 311 533 599

20" 311 354 354 311 533 667

24" 513 513 533 3012

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MD Steel Cooling Tower Engineering Data: Hoisting 33

1 Hoisting operations can be dangerous and suitable saetyprecautions should be taken to protect personnel and theequipment being hoisted.

2 All hoisting equipment should be certied and comply with localand national saety regulations.

NOTE

3 Ensure that slings are o sucient length so not to impose bendingloads onto the casinguse of spreader bars is essential.

4 For overhead lits or where additional saety is required, add slingsbeneath the tower unit

OFFSET MAY BE REQUIRED

FOR BALANCED LIFT

CENTER OF

TOWER

CENTER OF

TOWER

WIDTH WIDTH

LIFTING

SLING

LIFTING

SLING

70 MAX

BOTH MODULES

OFFSET MAY BE REQUIRED

FOR BALANCED LIFT

Model

Base Module Top Module

WidthSling Length

Minimum

Weight

kgWidth

Sling Length

Minimum

Weight

kg

MD5008 2.6m 3.0m 1100 2.7m 2.5m 900

MD5010 2.6m 3.5m 1400 2.6m 3.0m 1100

MD5016 3.7m 3.5m 1800 3.7m 3.0m 2100

MD5018 3.7m 4.5m 4000 3.7m 4.5m 1800

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MD Steel Cooling Tower Engineering Data: Freeze Prevention 34

When the ambient air temperature alls below 0C, thewater in a cooling tower can reeze. Marley Technical Report#H-003Operating Cooling Towers in Freezing Weatherdescribes how to prevent reezing during operation. Availableat spxcooling.com or ask your Marley sales representative ora copy.

During shutdown, water collects in the cold water basinand may reeze solid. You can prevent reezing by adding heatto the water let in the toweror, you can drain the tower andall exposed pipework at shutdown.

ELECTRIC BASIN HEATERSAn automatic basin water heater system is available

consisting o the ollowing components:

Standard weatherproo (IP55) enclosure, rating dependingon model and minimum expected winter temperature.

Ratings are in kW or speciied ambient temperature. Forlower ambient temperatures reer to SPX engineering oradvice.

Standard electircal supply is 380/415 V 3ph (220/240V 1ph available as extra cost option).

Heater has an integral thermostat, set point nominally 3Cbut adjustable to suit operating requirements.

Heater components are normally shipped separately or

installation by others.

Note: any exposed piping that is still illed with waterat shutdownincluding the makeup water lineshould beelectrically traced and insulated (by others).

INDOOR STORAGE TANK

With this type o system, water lows rom an indoor tank,through the load system, and back to the tower, where it iscooled. The cooled water lows by gravity rom the tower tothe tank located in a heated space. At shutdown, all exposedwater drains into the tank, where it is sae rom reezing.

The amount o water needed to successully operatethe system depends on the tower size and lowrate and onthe volume o water contained in the piping system to androm the tower. You must select a tank large enough tocontain those combined volumesplus a level suicient to

maintain a looded suction on your pump. Control makeupwater according to the level where the tank stabilizes duringoperation.

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MD Steel Cooling Tower Engineering Data: Water Quality 35

The MD cooling tower can be a very eective air washer.Atmospheric dust able to pass through the relatively smalllouver openings will enter the recirculating water system.Increased concentrations can intensiy systems maintenanceby clogging screens and strainersand smaller particulatescan coat system heat transer suraces. In areas o low lowvelocitysuch as the collection basinsedimentary depositscan provide a breeding ground or bacteria.

In areas prone to dust and sedimentation, you shouldconsider installing some means or keeping the collectionbasin clean. Typical devices include side stream ilters and a

variety o iltration media.

BLOWDOWN

Blowdown or Bleedo is the continuous removal o asmall portion o the water rom the open recirculating system.Blowdown is used to prevent the dissolved solids romconcentrating to the point where they will orm scale. Theamount o blowdown required depends on the cooling rangethe dierence between the hot and cold water temperatureso the closed circuit and the composition o the makeupwater.

WATER TREATMENT

To control the buildup o dissolved solids resulting romwater evaporation, as well as airborne impurities and biologicalcontaminants including Legionella, an eective consistentwater treatment program is required. Simple blowdown maybe adequate to control corrosion and scale, but biologicalcontamination can only be controlled with biocides.

An acceptable water treatment program must becompatible with the variety o materials incorporated in acooling towerideally the pH o the recirculating watershould all between 6.5 and 9.0. Batch eeding o the

chemicals directly into the cooling tower is not a good practicesince localized damage to the cooling tower is possible.Speciic startup instructions and additional water qualityrecommendations can be ound in the MD Cooling TowerUser Manualwhich accompanies the cooling tower and alsois available at spxcooling.com.

C A U T I O N

The cooling tower must be located at such distance

and direction to avoid the possibility o contaminated

discharge air being drawn into building resh air

intake ducts. The purchaser should obtain the

services o a Licensed Proessional Engineer or

Registered Architect to certiy that the location o

the cooling tower is in compliance with applicable air

pollution, ire and clean air codes.

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MD Steel Cooling Tower Speciications: Base 36

Specifications Specification Value

1.0 Base:

1.1 Furnish and install an induced-drat,counterlow-type, actory assembled, ilmill, industrial duty, cooling tower. Unitshall consist o _____ cell(s), as shownon plans. The limiting overall dimen-sions o the tower shall be _____ wide,

_____ long, and _____ high. Total operat-ing power o all ans shall not exceed

_____ kW, consisting o_____ @ _____kW motor(s). Tower shall be similar andequal in all aspects to Marley Model

_____________________.

2.0 Thermal Performance:

2.1 The tower shall be capable o cooling_____ m3/hr o water rom ____ C to_____ C at a design entering air wet-bulbtemperature o _____ C. The thermalperormance rating shall be Certiied bythe Cooling Technology Institute.

2.2 The tower shall be capable o mini-mum _____ m3/hr per kW eiciencyat 35C-29.5C-23.8C, per ASHRAEStandard 90.1.

3.0 Performance Warranty:

3.1 CTI Certiication notwithstanding, thecooling tower manuacturer shall guar-antee that the cooling tower suppliedwill meet the speciied perormanceconditions when the tower is installed asshown on the plans. I, because o a sus-pected thermal perormance deiciency,

the owner chooses to conduct an on-site thermal perormance test under thesupervision o a qualiied, disinterestedthird party in accordance with CTI orASME standards during the irst year ooperation; and i the tower ails to perormwithin the limits o test tolerance; then thecooling tower manuacturer will pay orthe cost o the test and will make suchcorrections as are appropriate and agree-able to the owner to compensate or theperormance deiciency.

Your specification base establishes the type, configuration, base material, andphysical limitations of the cooling tower to be quoted. During the planning andlayout stages of your project, you will have focused your attention on a cool-ing tower selection that fits your space allotment, and whose power usageis acceptable. Limitations on physical size and total operating horsepoweravoid the introduction of unforeseen operational and site-related influences.Specifying the number of cells, and the maximum fan hp/cell will work to youradvantage.You are specifying a counterflow tower, which is a type notedand often speci-fiedfor its economical use of plan area. It effectively replaces most makes ofolder towersboth forced-draft and induced-draftusually without major rede-sign of the existing site.

CTI Certification means that the cooling tower has been tested under operat-

ing conditions and found to perform as rated by the manufacturer under thosecircumstances. It assures the buyer that thetower is not intentionally or inadvertentlyundersized by the manufacturer. A list of CTIcertified cooling towers can be found at cti.org.

The minimum efficiency per ASHRAEStandard 90.1 for induced draft open cool-ing towers applied to comfort cooling is8.68 m3/hr/kW @ 35/29.5/23.8. There are no efficiency requirements for non-comfort cooling applications. If you want greater efficiency you can require it byspecifying a higher ASHRAE Standard 90.1 8.68 m3/hr/kW.

Each model's ASHRAE Standard 90.1 rating can be viewed in ouronline sizing and selection software at spxcooling.com/update.

CTI certification alone is not sufficient to assure you that the cooling towerwill perform satisfactorily in your situation. Certification is established underrelatively controlled conditions, and cooling towers seldom operate under suchideal circumstances. They are affected by nearby structures, machinery, enclo-sures, effluent from other sources, etc. Responsible and knowledgeable bidderswill take such site-specific effects into consideration in selecting the coolingtowerbut the specifier must insist by the written specification that the design-

er/manufacturer guarantee this real world performance. Any reluctance on thepart of the bidder should cause you some concern.

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4.0 Design Loading:

4.1 The tower structure, anchorage and allits components shall be designed bylicensed proessional engineers, employedby the manuacturer, per the InternationalBuilding Code to withstand a wind loado 146.5 kg/m2, as well as a .3g seismicload. Maintenance platorms and guard-rails, where speciied shall be capableo withstanding a 890N concentratedlive load in any direction and shall bedesigned in accordance with OSHAguidelines.

5.0 Construction:

5.1 Except where otherwise speciied, allcomponents o the cooling tower shall beabricated o heavy-gauge steel, protectedagainst corrosion by EN10142:2000grade G600 galvanizing. Ater passivationo the galvanized steel (8 weeks at pH7-8, and calcium hardness and alkalin-ity at 100-300 mg/L each), the coolingtower shall be capable o withstandingwater having a pH o 6.5 to 9.0; a chloridecontent up to 500 mg/L as NaCl (300mg/L as Cl-); a sulate content (as SO4)up to 250 mg/L; a calcium content (asCaCO3) up to 500 mg/L; silica (as SiO2)up to 150 mg/L; and design hot watertemperatures up to 55C. The circulating

water shall contain no oil, grease, attyacids, or organic solvents.Fiberglass casing, polyurethane barriers,and thermosetting hybrids and the com-ponents they are adhered to shall be con-sidered non-recyclable and not allowed.

5.2 The speciications, as written, are intend-ed to indicate those materials that willbe capable o withstanding the abovewater quality in continuing service, aswell as the loads described in paragraph4.1. They are to be regarded as minimumrequirements. Where component materialsunique to individual tower designs are not

speciied, the manuacturers shall takethe above water quality and load carryingcapabilities into account in the selectiono their materials o manuacture.

It is important to understand the distinction betweenstructure and anchor-age. Specifying that only the anchorage meet these requirements means thetower can become non-functional, even fall down, yet remain attached to thefoundation. Specifyingstructure will require the tower to remain operational.The indicated design values are the minimums allowed under accepted designstandards. They give you assurance that the tower can be shipped, handled,hoistedand ultimately operated in a normal cooling tower environment. MostMD models will withstand significantly higher wind and seismic loads. If yourgeographic location dictates higher wind load or seismic load values, pleasemake the appropriate changes, after discussion with your Marley sales repre-sentative.

Some countries and states, like Florida, require structure andanchorage to meet a given loading. Check with your local officials.

146.5 kg/m2 windload, .3g seismic loadapplicable for most applicationsbut consult the local code official for actual requirements.2.9kPa live load live load, 890N concentrated loadensures the towercan be safely accessed for routine maintenance when a guardrail is installed aswell ensuring the end user complies with government safety laws.

In the history of cooling towers, no other coating for carbon steel has exhibitedthe success and longevity of galvanization in exposure to the normal coolingtower water quality defined at left. No paints or electrostatically-applied coat-ings, however exotic they may be, can approach galvanization's history of suc-cess.

If extended longevity of the cooling tower is requiredor unusually harsh oper-ating conditions are expectedconsider specifying stainless steel as either thebase construction material, or the material utilized for specific components ofyour choice. See Stainless Steel Options on page 41.

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6.0 Mechanical Equipment:

6.1 Fan(s) shall be propeller-type, incorporat-ing aluminum alloy blades attached togalvanized hubs with U-bolts. Blades shallbe individually adjustable Fan(s) shall bedriven through a one-piece multi-groove,solid back V-type belt, sheaves (pulleys),and tapered roller bearings. Bearingsshall be rated at an L10A lie o 100,000hours, or greater. Both motor and ansheaves (pulleys) shall be all cast alumi-num to prevent premature corrosion.

6.1 (alternate)* Fan(s) shall be propeller-type, incorporating aluminum alloy bladesattached to galvanized hubs with U-bolts.Blades shall be individually adjustable.Maximum an tip speed shall be 66m/s.Fan(s) shall be driven through a rightangle, industrial duty, oil lubricated,geared speed reducer that requires nooil changes or the irst ive (5) years ooperation. All gearbox bearings shall berated at an L10A service lie o 100,000hours or greater and the gear sets shallhave AGMA Quality Class o 9 or greater.The gearbox shall include any modiica-tions to enable operation down to 10% oull speed.*Currently available on MD5016 and MD5018

models only.

6.2 Motor(s) shall be ____ kW maximum,

TEFC, 1.15 service actor, variable torque,inverter duty and insulated or coolingtower duty. Speed and electrical char-acteristics shall be ______ RPM, single-winding, 3 phase, ____ hertz, ____ volts.Motor shall operate shat-down position

or belt drive towers and in the shat-horizontal position or geardrive towers.Nameplate power shall not be exceededat design operation. TEAO motors are notacceptable.

6.3 The complete mechanical equipmentassembly or each cell shall be supportedby a rigid, hot-dip galvanized steel struc-tural support that resists misalignmentbetween the motor and sheaves (pul-leys). For belt-drive towers with motorsmounted outside the airstream, a pro-tective cover shall be mounted over themotor and sheave to protect it rom the

weather and prevent inadvertent contact.The mechanical equipment assembly shallbe warranted against any ailure causedby deects in materials and workmanship

Propeller-type fans require only half the operating hp of blower-type fans.However, they should be readily adjustable to permit compensation for jobsiteconditions.

The Marley Power Belt drive system features all-aluminum sheaves, power bandbelts and long-life bearings for dependable service.

TEFC motors offer additional benefits over TEAO motors whose only sourceof cooling is the flow of air produced by the cooling tower fan. This air rate isnot always ideal due to motor position, blockage, variable speed operation, etc.TEFC ensures the motor will always be cooled properly.

Unless otherwise specified, motor speed will be 1800 RPM in 60 Hertz areasand 1500 RPM in 50 Hertz areas on standard models. Low sound models willuse motor speeds appropriate for the specific model.

The value of a 5 year mechanical equipment warranty speaks for itself. Exceptfor the motor, virtually all of the mechanical equipment on a Marley tower isdesigned and manufactured by SPX Cooling Technologies. Cooling tower ven-dors who purchase commercial fans, driveshafts, etc. may require that you dealdirectly with those commercial suppliers for warranty satisfaction.

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or no less than ive (5) years ollowingthe date o tower shipment. This warrantyshall cover the an(s), premium eiciencymotor(s), speed reducer(s), drive shat(s)and coupling(s), and the mechanicalequipment support. The bearing assem-blies and V-belts shall be warranted or18 months.

7.0 Fill, Louvers and Drift Eliminators:

7.1 Fill shall be cross-corrugated, counterlowilm type, thermoormed rom 15 mil thickPVC. Fill shall be supported on channelsections supported rom the tower struc-ture and have a lame spread rating lessthan 25.

7.2 Drit eliminators shall be 17 mil thick PVCwith a minimum o three changes in airdirection, and shall limit drit losses to0.005% or less o the design water lowrate.

7.3 Air inlet louvers shall be a minimum o 5"air travel, triple pass PVC to limit watersplashout and prevent direct sunlight romentering the collection basin. For easeo service and long lie o louvers, PVClouvers shall be enclosed in a removablerame that attaches to the air inlet withouttools. Louvers with less than three chang-es in air direction are unacceptable.

8.0 Hot Water Distribution System:

8.1 A pressured spray system shall distributewater evenly over the ill. The branch armsshall be corrosion resistant PVC with poly-propylene spray nozzles attached to thebranch arms with a rubber socket con-nection or ease o removal and cleaning.To ensure proper spray system operation,nozzles shall seat in branch arms withoutregard or direction or alignment.

Fill modules can be removed for inspection and cleaning in accordance withlocal anti legioinella guidelines.

Drift rate varies with design water loading and air rate, as well as drift eliminatordepth and number of directional changes. A drift rate of 0.001% is readily avail-able on many standard models. If a lower rate is required, please discuss withyour Marley sales representative.

Triple-pass inlet louvers

The combination of PVC piping and polypropylene nozzles is very resistant tothe build-up of scale and slime.

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MD Steel Cooling Tower Speciications: Options 41

Stainless Steel Options

Stainless Steel Collection Basin:

11.1 Replace paragraph 11.1 with the follow-ing:The collection basin shall be welded301L stainless steel construction. Onlylow-carbon stainless steel alloys will beaccepted in order to minimize the risk ointergranular corrosion in the weld zones.The basin shall include the number andtype o suction connections required toaccommodate the out-low piping systemshown on the plans. Basin suction con-nections shall be equipped with debrisscreens. A actory installed, loat oper-ated, mechanical make-up valve shall beincluded. An overlow and drain connec-tion shall be provided in each cell o thetower. The basin loor shall slope towardthe drain to allow complete lush out odebris and silt which may accumulate.

All Stainless Cooling Tower:

5.1 Replace paragraph 5.1 with the follow-ing:Except where otherwise speciied, allcomponents o the cooling tower shall beabricated o heavy-gauge, series 301Lstainless steel. Only low-carbon stainlesssteel alloys will be accepted in order tominimize the risk o intergranular corro-sion in the weld zones. The tower shall becapable o withstanding water having achloride content (NaCl) up to 750 mg/L;a sulate content (SO4) up to 1200mg/L; a calcium content (CaCO3) up to800 mg/L; silica (SiO2) up to 150 mg/L;and design hot water temperatures up to

57C. The circulating water shall containno oil, grease, atty acids, or organic sol-vents.

The cold water basin is the only part of the tower that is subject to periods ofstagnant water, concentrated with treatment chemicals and customary contami-nants. It is also the most expensive and difficult part of any tower to repair orreplace. For these reasons, many customersparticularly those who are replac-ing older towerschoose to specify stainless steel cold water basins.

The 316 alloy was designed to increase resistance to chlorides. Generally,cooling towers in HVAC service utilize water sources, which do not approach

the limits of 300 series stainless, even up to several cycles of concentration.Industrial cooling towers, generally circulating more aggressive water, use 300series stainless as standard metallurgy, upgrading to 316 for situations suchas estuary water or other significant source of chlorides. The vast majority ofcooling tower water sources result in an acceptable environment for 300 seriesstainless steel, with HVAC systems typically being on the mild end of the spec-trum. If you have one of the rare instances where water quality exceeds900 mg/l Cl, talk to you Marley sales representative about 316SS.

Where water quality falls outside the limits indicated in Paragraph 5.1, anall-stainless tower is worthy of your consideration. For pure resistance to cor-rosioncoupled with the capability to meet stringent fire and building codesthere is no substitute for stainless steel. No paints or electostatically-appliedcoatings, however exotic they may be, can match stainless steel's ability to with-stand adverse operating conditions.

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Convenience and Safety Options

Mechanical Access Platform:

10.2 Add the following paragraph in theAccess section:There shall be amechanical access platorm at themechanical access door allowing accessto the mechanical system, drit elimina-tors, distribution system and ill. The plat-orm shall be galvanized steel bar grating,supported by galvanized steel rameworkattached to the tower. The platorm shallbe surrounded by a guardrail, kneerail,and toeboard designed according toOSHA guidelines and shall be capable owithstanding a 890N concentrated liveload in any direction. A ladder shall bepermanently attached to the platorm andto the casing o the tower, rising rom thebase o the tower to the top o the hand-rail.

Ladder Extension:

10.2 Add the following to the end of para-graph 10.2:Provide a ladder extensionor connection to the oot o the ladder.This extension shall be long enough torise rom the roo (grade) level to thebase o the cooling tower. The installingcontractor shall be responsible or cut-ting the ladder to length; attaching it tothe oot o the cooling tower ladder; andanchoring it at its base.

Ladder Safety Cage:

10.2 Add the following to the end of para-

graph 10.2:A welded aluminum saetycage shall surround the ladder, extendingrom a point approximately 2m above theoot o the ladder to the top o the hand-rail. Maximum weight o welded subas-semblies shall not exceed 10 kg or easeo installation.

Ladder Safety Gate:

10.2 Add the following to the end of para-graph 10.2: A steel, sel-closing gateshall be provided at the guardrail level othe ladder.

Periodic inspection and maintenance of a cooling tower distribution system isfundamental to preserving maximum cooling system efficiency. All cooling tow-erscrossflow or counterfloware subject to clogging to varying degrees bywaterborne contaminants such as pipe scale and sediment. Therefore, safe andeasy access to these components is of significant value to the operator.

Access can be provided in a number of ways, including portable ladders orscaffolding, but for maximum safety and convenience, a field installed Marleyaccess platform with guardrails is available to make this task as safe and user-friendly as possible. Further, its location on the side of the tower does not addto the height of the unit, preserving architectural integrity. It also saves theowner time and money, in that maintenance personnel may devote their time toinspection rather than searching for ladders or erection of portable scaffolding.

Many cooling towers are installed such that the base of the unit is 2'-0" or moreabove the roof or grade level. This makes it difficult to get up to the foot of theattached ladder. The ladder extension alleviates this problem. Marley ladderextensions are available in standard 5'-0" and 11'-0" lengths.

A galvanized steel self-closing gate located at the guardrail level of the fandeck, exterior motor access platform and access door platform. Stainless steelis available with the stainless guardrail option.

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Motor Davit:

10.4 Add the following paragraph in theAccess section:A powder coated davitcrane with hot dipped galvanized mount-ing base shall be ield installed on themotor ace o the cooling tower and shallhave a maximum capacity o 230 kg.

Motor and Fan Davit:

10.4 Add the following paragraph in theAccess section:A powder coated davitcrane with hot dipped galvanized mount-ing base shall be ield installed on themotor ace o the cooling tower. The davitshall have maximum capacity o 230 kgat a 1.7m boom extension and 500kg ata 1m boom extension.

Control Options

Fan Motor Starter Control Panel:

6.4 Add the following paragraph in theMechanical Equipment section:Each cello the cooling tower shall be equippedwith a UL / CUL 508 listed control panelin a IEC IP14 or IP56 outdoor enclo-sure capable o controlling single-speedor two-speed motors as required, anddesigned speciically or cooling towerapplications. The panel shall include amain circuit breaker or main used discon-nect with an external operating handle,lockable in the o position or saety. Fullvoltage non-reversing magnetic startershall be controlled with a thermostaticor solid-state temperature controller.Door mounted selector switches shall be

provided to enable automatic or manualcontrol and wired or 230VAC control.Control circuit to be wired out to terminalblocks or ield connection to a remotevibration switch, overload trip alarms andremote temperature control devices. Thetemperature controller shall be adjustableor the required cold-water temperature.I a thermostatic controller is used it shallbe mounted on the side o the tower withthe temperature sensing bulb installed inthe cold water basin using a suspensionmounting bracket. I a solid-state tem-perature controller is used the controllerwill be door mounted on the control panel.

The solid-state temperature controller willdisplay two temperatures, one or outgo-ing water and the other or set point.Water temperature input shall be obtained

Simplify the removal of the fan motor when required. If you would prefer stain-less steel construction change powder coated and hot dipped galvanized tostainless steel in the description. Available with this option is a zinc plated handcrank winch with 14m of 3/16" diameter galvanized aircraft cable with swivelhook with swaged ball fitting.

Simplify the removal of the fan motor or fan assemble when required.If youwould prefer stainless steel construction change powder coated and hotdipped galvanized to stainless steel in the description. Available with this optionis a zinc plated hand crank winch with 18m of 1/4" diameter galvanized aircraftcable with swivel hook and swaged ball fitting.

Also available with this options is an electric winch with a 1.8m pendant control.Includes 18m of 1/4" diameter galvanized aircraft cable with swivel hook withswaged ball fitting.

If it is your opinion that the control system for the cooling tower be part of thecooling tower manufacturers responsibility, we are in wholehearted agreementwith you. Who better to determine the most efficient mode and manner of acooling towers operationand to apply a system most compatible with itthanthe designer and manufacturer of the cooling tower?

Marley variable speed drives are also available for the ultimate in temperaturecontrol, energy management, and mechanical equipment longevity.

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using a three-wire RTD with dry well inthe outlet water piping and wired back tothe solid-state temperature controller inthe control panel.

Vibration Limit Switch:

6.5 Add the following paragraph in theMechanical Equipment section:A vibra-tion limit switch in a IP 56 housing shallbe installed on the mechanical equipmentsupport and wired to the shutdown cir-cuit o the an motor starter or VFD. Thepurpose o this switch will be to interruptcontrol power voltage to a saety circuit inthe event o excessive vibration causingthe starter or VFD equipment to de-ener-gize the motor. It shall be adjustable orsensitivity, and include a means to resetthe switch.

Basin Heater:

11.2 Add the following paragraph in the ColdWater Basin section:Provide a systemo electric immersion heaters and con-trols or each cell o the tower to preventreezing o water in the collection basinduring periods o shutdown. The systemshall consist o one or more stainlesssteel electric immersion heaters installedin threaded couplings provided in theside o the basin. A IP 56 enclosure shallhouse a magnetic contactor to energizeheaters; a transormer to provide 24-voltcontrol circuit power; and a solid-state cir-cuit board or temperature and low watercut-o. A control probe shall be located inthe basin to monitor water level and tem-perature. The system shall be capable o

maintaining 5C water temperature at anambient air temperature o _____ C.

Water Level Control System:

11.2 Add the following paragraph to the ColdWater Basin section:Provide a waterlevel control system including a IP56 con-trol panel, water level probes and probestilling chamber. The control system shallmonitor the water level in the cold-waterbasin to determine level events used orcold-water make-up, high and low alarmsor pump shut down. The control panelshall use electromechanical relays provid-

ing power or the make-up solenoid andelectrical contacts or alarm and pumpshutdown control circuits. Probes shall becontained in a vertical stilling chamber to

Unless specified otherwise, a Marley M-5 vibration switch will be provided. Therequirement for manual reset assures that the cooling tower will be visited todetermine the cause of excessive vibration.

The Marley basin heater components described at left represent our recom-mendation for a reliable automatic system for the prevention of basin freezing.They are normally shipped separately for installation at the jobsite by the installingcontractor. When purchased in conjunction with the enhanced Control Systemoption, however, they are customarily factory-mounted and tested.

Submerged in basin water, in which zinc ions arepresent, copper immersion heaters mustnot be used. Insist upon stainless steel.

The ambient air temperature that youinsert in the specifications shouldbe the lowest 1% level of wintertemperature prevalent at site.

Solid-state liquid level controls provide you with state of the art systems to con-trol and monitor the water level in your cooling tower collection basin. Relaysoperating in conjunction with suspended stainless steel electrode probesmonitor basin water levels, providing simple solenoid-valve water makeup ordiscrete on/off signals to more sophisticated automation controls. Optional con-figurations might include makeup along with high and low water level alarm andcutoff, or pump cutoff. Packaged systems including any of these variations areavailable. Consult you Marley sales representative or download a copy of ACC-NC-9 from spxcooling.com for additional information.

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stabilize the water in the cold-water basin.Probes shall have replaceable stainlesssteel tips and level height shall be ieldadjustable.

Fan Motor Variable Speed Drive:

Marley All Weather ACH550 System

6.4 Add the following paragraph in theMechanical Equipment section whenVFD is used with customers BuildingManagement System:A complete ULlisted Variable Speed Drive system in a IP10 indoor, IP 52 indoor or IP 14 outdoorenclosure shall be provided. The VFDshall use PWM technology with IGBTswitching and integrated bypass design.The VFD shall catch a an spinning in thereverse direction without tripping. Thepanel shall include a main disconnectwith short circuit protection and exter-nal operating handle, lockable in the oposition or saety. The VFD system shallreceive a speed reerence signal rom theBuilding Management System monitoringthe tower cold-water temperature. As anoption to receiving the speed reerencesignal rom a building management sys-tem, the drive must have the capabilityto receive a 4-20 ma temperature signalrom an RTD transmitter. The VFD shallhave an internal PI regulator to modulatean speed maintaining set point tem-perature. The drive's panel display shallbe able to display the set-point tempera-ture and cold-water temperature on twoseparate lines. The bypass shall includea complete magnetic bypass circuit andwith capability to isolate the VFD when in

the bypass mode. Transer to the bypassmode shall be manual in the event o VFDailure. Once the motor is transerred tothe by-pass circuit the an motor will runat constant ull speed. The bypass circuitwill not modulate ON and OFF based oncold-water temperature. The applicationmust be able to handle very cold waterwhile VFD is in a by-pass mode. Operatorcontrols shall be mounted on the ront othe enclosure and shall consist o startand stop control, bypass/VFD selection,Auto/Manual selections, manual speedcontrol. To prevent heating problems inthe cooling tower an motor, the VFD

system shall de energize the motor once25% motor speed is reached and coolingis no longer required. The cooling towermanuacturer shall supply VFD start-

Marley VFD drive systems are designed to combine absolute temperaturecontrol with ideal energy management. The cooling tower user selects acold water temperature and the drive system will vary the fan speed tomaintain that temperature. Precise temperature control is accomplishedwith far less stress to the mechanical equipment components. Theimproved energy management provides fast payback.

Motors operated on a VFD shall carry a service factor of 1.0. When oper-ating on a VFD, the drive parameters should be programmed to limit thecurrent to motor nameplate hp. Adjust the Motor specification accord-ingly.

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up assistance. Tower vibration testingthroughout the speed range is required toidentiy and lockout any natural requencyvibration levels which may exceed CTIguidelines.

Marley Premium VFD System:

6.4 Add the following paragraph in theMechanical Equipment section whenVFD is used as a stand alone system:Acomplete UL listed Variable Speed Drivesystem in a IP 52 indoor or IP 14 outdoorenclosure shall be provided. The VFDshall use PWM technology with IGBTswitching and integrated bypass design.The VFD shall catch a an spinning in thereverse direction without tripping. Thepanel shall include a main disconnect withshort circuit protection and external oper-ating handle, lockable in the o positionor saety. The system shall include a solidstate, PI temperature controller to adjustrequency output o the drive in responseto the tower cold-water temperature. Thetemperature o the cold water and setpoint shall be displayed on the door o thecontrol panel. The bypass shall includea complete magnetic bypass circuit withcapability to isolate the VFD when inthe bypass mode. Transer to the bypassmode shall be automatic in the event oVFD ailure or or speciic trip conditionsallowing sae transer o utility voltageto the motor. Automatic bypass with anearth ground condition is not allowed. Thebypass contactor shall be cycled on ando while operating in bypass, to maintainthe set-point temperature o the coldwater. The drive design shall be operated

as a stand- alone system without theneed or a BMS system. Operator con-trols shall be mounted on the ront o theenclosure and shall consist o start andstop control, bypass/VFD selector switch,Auto/Manual selector switch, manualspeed control, and solid-state temperaturecontroller. An emergency bypass selec-tor switch internal to the panel allowingthe cooling tower an motor to be run atull speed shall be urnished. To preventheating problems in the cooling tower anmotor, the VFD system shall de energizethe motor once 25% motor speed isreached and cooling is no longer required.

The VFD shall include de-icing logic withauto canceling and adjustable time. Speedin De-Ice mode shall not exceed 50 %motor speed. The cooling tower manuac-

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Where it is your intention to be able to operate both cells of the tower whilethe flume cover plate is installed, separate outlet connections, float valves andoverflows must be provided for each cell. Likewise, this would require separatesensors and controls for basin heater systems, if installed.

Extensions are available in nominal 30cm increments to a maximum height thatvaries by model. Such extensions may be considered necessary in order toelevate the discharge beyond the bounds of an enclosure. Discuss applicabilitywith your local Marley sales representative.

turer shall supply VFD start-up assistance.Tower vibration testing throughout thespeed range is required to identiy andlockout any natural requency vibrationlevels which may exceed CTI guidelines.

Miscellaneous Options

Equalizer Flume Weir Gates:

11.2 Add the following paragraph under ColdWater Collection Basin:The intercon-necting lume between cells shall beequipped with a removable cover plate topermit the shutdown o one cell or main-tenance purposes, or to permit indepen-dent cell operation.

Fan Cylinder Extensions:

9.1 Insert the following before the last sen-tence:Fan cylinder extensions shall beprovided to elevate the an discharge toa height o ___ mm above the an deck

level.

Basin Sweeper Piping:

11.2 Add the following paragraph to the ColdWater Collection Basin section:The coldwater basin shall be equipped with factoryinstalled corrosion resistant PVC sweeperpiping with plastic nozzles. The sweeperpiping system shall be designed to forcedirt and debris towards a dedicated drainin the depressed section of the collectionbasin.

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Sound Control:

1.2 Add the following paragraph to theBase section:The cooling tower shallbe designed or quiet operation, andshall produce an overall level o soundnot higher than _______ dB(A) mea-sured at _______ t rom the locationsin the ollowing table. Sound levels shallbe measured with a Type 1 (precision)system and in ull conormance withATC-128 test code published by theCooling Technology Institute (CTI). Themeasurement system shall have a real-time requency analyzer and separatemicrophones with an overall tolerance +/-3 dB. All low sound options shall be CTICertiied or thermal perormance.

Splash Attenuation:

1.3 Insert the following paragraph in theBase section:The cooling tower shallbe equipped with polypropylene splashattenuation media actory installed in thecollection basin to reduce alling waternoise.

Outlet Sound Attenuation:

1.3 Add the following paragraph to theBase section:The cooling tower shall beequipped with outlet sound attenuationbales positioned and spaced horizontallyacross the entire an opening. The balesshall be constructed o perorated sheetmetal illed with sound absorbing material,and contained within a steel box that issel-supporting.

Sound produced by a standard MD tower operating in an unobstructed environ-ment will meet all but the most restrictive noise limitationsand will react favor-ably to natural attenuation. Where the tower has been sized to operate within anenclosure, the enclosure itself will have a damping effect on sound. Sound alsodeclines with distanceby about 5 or 6 dB(A) each time the distance doubles.Where noise at a critical point is likely to exceed an acceptable limit, you haveseveral optionslisted below in ascending order of cost impact:

In many cases, noise concerns are limited to night time, when ambient noiselevels are lower and neighbors are trying to sleep. You can usually resolvethese situations by using variable speed drives, and operating the fans atreduced speed after hours. The natural night time reduction in wet-bulbtemperature makes this a very feasible solution in most areas of the world.Variable speed drives automatically minimize the tower's noise level duringperiods of reduced load and/or reduced ambient without sacrificing the sys-tem's ability to maintain a constant cold water temperature. This is a relativelyinexpensive solution, and can pay for itself qu

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