Marley AV single flow cooling tower engineering data and sales
Contents
1. 13 OVERALL OF BASIN OVERALL OF BASIN 1 1 1 ANCHOR ANCHOR 4 ANCHOR ANCHOR BOLT BOLT Cl BOLT a E Meet v A er rrr ete ee eee a 1 10 1 4 E 5 6 pog o IQ r4 HOLES FOR 9 1 2 DIA ANCHOR lt BOLTS 4REQD HOLES FOR l 1 2 DIA ANCHOR py on BOLTS 4 MIN 8 O 1 2 MIN 2 PM 2 im Doa NM 5H 98 1 10 1 4 8 LI EU NE NENNEN 5 C 2 i B TOWER COLLECTION TOWER COLLECTION BASIN AIR INLET FACE BASIN AIR INLET FACE SUPPORTING STEEL SUPPORTING STEEL OPTION THREE OPTION FOUR r MINIMUM BEARING WIDTH MUST BE TOWER PROVIDED BY BEAM FLANGE OR BEARING 31 2 MAX TO CLEAR LARGEST COLLECTION PLATE AT EACH ANCHOR BOLT LOCATION BOTTOM OUTLET FLANGE BASIN TOWER 1 2 WASHER REQD 1 2 WASHER REQ Eon OTON BY OTHERS BY OTHERS po SUPPORT k NORMAL BY OTHERS GAUGE NORMAL SUPPORT B GAUGE BY OTHERS ANCHOR BOLT LOCATION RELATIVE TO BEAM ORIENTATION I5 OPTIONAL VIEW B VIEW C NOTE 1 Use this bulletin for preliminary layouts only Obtain current drawings 6 Anchorage for Supporting Steel Options One and Two are designed from your Marley sales representative for final de2. TRASH SCREEN 13 6 L OUT OF TOWER SECTION SIDE OUTLET SUCTION CONNECTION OUTLET SEE TABLE FOR SIZE Maximum gpm Outlet TOWER COLLECTION dii BASIN FLOOR Bottom Outlet Side Suction Side Suction pump flow REMOVABLE pump flow pump flow 89 ul w anti vortex TRASH SCREEN OUTLET air inlet face cased face plate or CONNECTION Outlet gravity flow Dia 2 he el AV62 Section 7 aves AVES All Models All Models All Models a MEM NOTE BOTTOM OUTLET IS De ave7 ALSO AVAILABLE WITHOUT BASE OF TRASH SCREEN TOWER 4 i 164 BOTTOM OUTLET CONNECTION d _ 1595 1568 287 658 10 2569 453 1038 12 3500 644 1476 14 788 1807 k 32 MAKEUP b 1 MNPT 13 4 3 TOWER OVERFLOW 4 4 FNP 1 imensions Tower Model 7 B DRAIN Lon Laan 3 FNP 1 2 2 7 Va AV61 1 9 3 10 AV62 3 6 5 7 3 5Je AV63 1 9 3 10 AV64 1 9 3 10 BASE OF 2 4 OUT OF TOWER AV65 9 g 4 7 TOWER AIR INLET FACE SECTION AV67 3 6 5 7 OVERFLOW DRAIN AND MAKEUP CONNECTION NOTE 1 For gravity flow situations as to an indoor tank use botto
3. X 0 T T gt 2 QD qe 9 3 Marley AV Cooling Tower Contents Engineering Data Schematic 4 Support 12 Hoisting Info 14 Freeze Prevention 15 Environmental 16 Application 17 Specifications Base Base 18 Thermal Performance 19 Performance Warranty 19 Design Loading 19 Construction 20 Mechanical Equipment 21 Fill Louvers and Drift Eliminators 29 Hot Water Distribution System 23 Casing Fan Deck Fan Cylinder and Fan Guard 23 Access 24 Cold Water Collection Basin 25 Specifications Options Stainless Steel Options All Stainless Steel Cooling Tower 26 Fill Louvers and Drift Eliminators 26 Hot Water Distribution System 26 Casing Fan Deck Fan Cylinder and Fan Guard 27 27 Stainless Steel Collection Basin 28 Control Options Fan Motor Starter Control Panel 28 Terminal Box 28 Vibration Limit Switch 29 Basin Heater 30 Fan Motor Variable Speed Drive 30 Single Point Power Connection 31 Convenience and Safety Options Hot Water Basin Access Platform 32 Ladder Extension 32 Ladder Safety Cage 32 Mechanical Equipment Access Platform 33 Miscellaneous Options Fan Cylinder Extensions 34 Equalizer Flume Weir Gates 34 Marley Control Valve 34 Premium Efficiency Motor 34 FM Approval 34 Quiet Fan 35 Ultra Quiet Fan 35 Variable Water Flow Distribution 35 AV Cooling Tower AW towers are galvanized steel factory assembled general purpose crossflow cooling towers designed to serve
4. 7 5e 8 7 15 11 6 16 817 AV6403L 258 20 11105 6326 3604 AV6404L 279 25 11280 6501 3779 AV6405L 296 30 11360 6581 3859 AV6500L 237 10 12251 6660 3745 AV6501L 265 15 12345 6754 3839 AV6502L 282 20 12651 7060 4019 9 10 16 7 16 10 1 1 2 15 11 6 16 8 he AV6503L 305 25 12821 7230 4189 AV6504L 322 30 12906 7310 4269 AV6505L 338 40 13202 7611 4570 AV6600L 273 15 13473 7169 4216 AV6601L 299 20 13578 7214 4261 AV6602L 316 11 10 15 2 12 1 14 6 e 15 3 e 25 14023 7659 4575 AV6603L 336 30 14103 7739 4655 AV6604L 348 40 14404 8040 4956 AV6700L 287 15 14278 7493 4216 AV6701L 314 20 14323 7538 4261 AV6702L 337 11 10 16 7 1 12 1 15 11 6 16 817 25 14493 7708 4431 AV6703L 358 30 14869 7932 4655 AV6704L 382 40 15171 8234 4957 1 Use this bulletin for preliminary layouts only Obtain current 4 Standard overflow is a 4 dia connection in the collection basin wall drawings from your Marley sales representative All table data is per on the air inlet side of the tower A 3 dia drain connection is located cell below the overflow See page 7 for details 2 Last numeral of model number indicates number of cells Change as 5 Outlet sizes vary according to GPM and arrangement See pages 6 and appropriate for your selection 7 for outlet sizes and details Nominal tons are based upon 95 F HW 85 F CW 78 F WB and 3 6 Makeup water connection may be 1 or 2 dia depending upon tower GPM ton heat load water pressure and desir
5. H 008 Operating Cooling Towers in Freezing Weather describes how to prevent freezing during operation Available at spxcooling com or ask your Marley sales representative for a copy During shutdown water collects in the cold water basin and may freeze solid You can prevent freezing by adding heat to the water left in the tower or you can drain the tower and all exposed pipework at shutdown ELECTRIC BASIN HEATERS An automatic basin water heater system is available con sisting of the following components Stainless steel electric immersion heater s Threaded couplings are provided in the side of the collection basin NEMA 4 enclosure containing Magnetic contactor to energize heater Transformer to convert power supply to 24 volts for control circuit Solid state circuit board for temperature and low water cutoff Enclosure may be mounted on the side of the tower Control probe in the collection basin to monitor water temperature and level Heater components are normally shipped separately for installation by others Note any exposed piping that is still filled with water at shutdown including the makeup water line should be electrically traced and insulated by others AV Cooling Tower Engineering Data Freeze Prevention 15 STEAM JET BASIN HEATER Penberthy Houdaille bronze steam jet heaters to 34 are available for freeze protection installation by others Injec tors install i
6. 2134 mm above the foot of the ladder to the top of the distribution basin access platform handrail E The access doors on competitive towers may be 18 wide or smaller which is unreasonably small for a human being Specifying the size of the door will cause those bidders to take exception alerting you to a potential maintenance headache Two doors are standard on all towers so that access between cells of multicell towers is assured AV Cooling Tower Specifications Base 05 Specifications Specification Value Provide an internal platform approximately 7 2134 mm below the level of the fan for access to the mechanical equipment The platform shall be galvanized steel bar grating supported by galvanized steel framework attached to the tower The platform shall be surrounded by a hand rail and kneerail A permanently attached 1 6 457 2 mm wide aluminum ladder with 3 76 2 mm I beam side rails and 1 25 31 8 mm diameter serrated rungs shall extend from the cold water basin to the top of the handrail Air Inlet Screens The air inlet faces of the tower shall be covered by 1 mesh hot dipped galvanized welded wire screens Screens shall be secured to removable galvanized U edge frames Cold Water Collection Basin The collection basin shall be G 235 galvanized steel and assembled with bolted connections Tap screws shall not be allowed The cold water basin shall be heavy gauge
7. Motor specification accordingly Applications requiring a cable distance between VFD and motor of over 100 feet requires a separate DV DT motor filter to be installed and wired at the drive This filter protects the motor from damaging high voltage spikes on the motor windings inherent with long lead runs a e ws uj D S LI I I AV Cooling Tower Specifications Options 31 Specifications Specification Value receiving the speed reference signal from a building management system the drive must have the capability to receive a 4 20 mA temperature signal from an RTD transmitter The VFD shall have an internal PI regulator to modulate fan speed maintaining set point tempera ture The drive s panel shall display the set point temperature and cold water temperature on two separate lines The bypass shall include a complete mag netic bypass circuit with the capability to isolate the VFD when in the bypass mode Transfer to the bypass mode shall be manual in the event of VFD failure Once the motor is transferred to the bypass circuit the fan motor will run at constant full speed Operator controls shall be mounted on the front of the enclosure and shall consist of Start and Stop control Bypass VFD selection Auto Manual selections and manual speed control To prevent heating prob lems in the cooling tower fan motor the VFD system shall de energize
8. OF 8 INLET PIPING Y BY OTHERS TOWER BY OTHERS e INLET PIPING DETAILS 1 1576 r INLET FACE 11 82 31 2 Log e INLET A BASE OR TOWER HINGED ACCESS DOOR AV Cooling Tower Engineering Data Schematic 1 Shipping Weight Tower Nominal Dimensions Design ib Motor Operating Model Tons te 2 le hp Wiel Heaviest note 8 H A S 16 Weight Cell 5 Section AV6100L 115 3 8232 4382 AV6101L 135 5 8283 4433 AV6102L 154 8 4 12 8354 8 71 11 617 19 3 51 To 8383 4533 AV6103L 164 10 8532 4682 AV6104L 191 15 8653 4803 AV6200L 169 5 10926 5463 AV6201L 189 T2 11027 5564 AV6202L 209 10 11068 5605 11 10 12 3 6 12 1 11 6 Ae 12 3 s AV6203L 224 15 11344 5881 AV6204L 254 20 11412 5949 AV6205L 270 25 11584 6121 AV6300L 186 Th 10157 5685 3330 AV6301L 200 10 10201 5729 3374 AV6302L 227 8 4 15 2 Ag 8 7 14 65 15 371 15 10449 5977 3536 AV6303L 243 20 10517 6045 3604 AV6304L 259 25 10692 6220 3779 AV6400L 197 To 10791 5953 3330 AV6401L 213 10 10815 5997 3374 AV6402L 241 15 11059 6280 3558 8 4 16
9. a competent qualified water treatment supplier A CAUTION The cooling tower must be located at such distance and direction to avoid the possibility of contaminated discharge air being drawn into building fresh air intake ducts The purchaser should obtain the services of a Licensed Professional Engineer or Registered Architect to certify that the location of the cooling tower is in compliance with applicable air pollution fire and clean air codes AV Cooling Tower Engineering Data Application TYPICAL APPLICATIONS The AV cooling tower can be used in normal applications requiring cold water for the dissipation of heat This includes condenser water cooling for air conditioning refrigeration and thermal storage systems as well as their utilization for free cooling in all of those systems They are also used in the cool ing of jacket water for engines and air compressors and are widely applied to dissipate waste heat in a variety of industrial and manufacturing processes Choosing the all stainless steel construction option the AV can be confidently applied in unusually corrosive processes and operating environments However no single product line can answer all problems and selective judgement should be exercised in the following situations APPLICATIONS REQUIRING ALTERNATIVE COOLING TOWER SELECTIONS Certain types of applications are incompatible with any cooling tower with PVC film fill whether an AV or other manuf
10. be driven through an industrial grade system of V belts pulleys and tapered roller bearings Bearings shall be rated at 50 000 hours or greater Motor s shall be 40 Hp maximum Totally Enclosed 1 15 service factor variable torque and specially insulated for cooling tower duty Speed and electrical characteristics shall be 1800 rpm single winding phase Hz volts The fan and fan drive assembly for each cell shall be supported by a rigid welded hot dip galvanized steel structural support that resists misalignment The mechanical equipment assembly shall be warranted against any failure caused by defects in materials and workmanship for no less than five 5 years following the date of tower shipment This warranty is limited to the fan fan shaft bearings and mechani cal equipment support The motor motor components sheaves and belt s are war ranted by their manufacturer Wi Propeller type fans require only half the operating hp of blower type fans However they should be readily adjustable to permit compensation for job site conditions that may tend to overload the motor The fans of one manufacturer require the purchase of special positioners for each incre ment of fan blade pitch Unless otherwise specified motor speed will be 1800 RPM in 60 Hertz areas and 1500 RPM in 50 Hertz areas If you prefer the operating flex ibility of two speed operation please specify the RPM to be 1800 900 1500 750 in 50 Her
11. fill results in a line of towers capable of meeting most noise limitations Where noise at a critical point is likely to exceed an acceptable limit several other options are available listed below in ascending order of cost impact The Marley Ouiet Package includes the affordable Quiet Fan mechanical option optimized to achieve the lowest possible sound levels while maintaining efficiency A Marley Variable Speed Drive automatically minimizes the tower s noise level during periods of reduced load and or reduced ambient temperature without sacrificing the system s ability to maintain a constant cold water temperature This is a relatively inexpensive solution and can pay for itself quickly in reduced energy costs The natural nighttime reduction in wetbulb temperature makes this a very feasible solution in most areas of the world It also eliminates fan cycling In combination with a Marley Quiet Package the Marley Variable Speed Drive is capable of meeting all but the most restrictive noise limitations For more severe cases requiring the lowest possible fan sound levels the Marley Ultra Quiet fan option is now available on most AV models Tower height will increase obtain current sales drawings from your Marley sales representative for accurate dimensions Extreme cases may require inlet and discharge sound attenuator sections however the static pressure loss imposed by attenuators may necessitate an increase in t
12. galvanized steel and The basins shall include the number and type of suction connections required to accommodate the outflow piping system shown on the Plans Suction connec tions shall be equipped with galvanized debris screens A factory installed float operated mechanical makeup valve shall be included A 3 76 2 mm diameter drain and a 4 101 7 mm diameter overflow shall be provided in each cell of the tower The basin shall include a depressed section into which accumulat ed silt can be flushed to permit cleaning The basin floor adjacent to the depressed section shall slope toward the depressed section to prevent buildup of silt under the fill area Towers of more than one cell shall include flumes for flow and equaliza tion between cells Choose from side suctions and bottom outlets to accommodate a signifi cant variety of piping schemes Unless so specified the tower you may be asked to approve may only be available with one type of suction con nection requiring you to redesign your piping layout If your preference is for a stainless steel tower or if your water or air quality suggests that the use of stainless steel is prudent see stainless steel options on page 26 AV Cooling Tower Specifications Options 26 Specifications Specification Value Stainless Steel Options All Stainless Cooling Tower Replace paragraph 1 1 with the following Provide an induced draft crossflow type factory ass
13. testing after installation can however be inaccurate depending on the environment Another is to conduct a sound test at the factory However both can be cost prohibitive for smaller applications Specifying fan blade tip speed is one way to physically force the tower selection to be quiet Tip speed is easily checked by multiplying the fan RPM by the fan circumference at the blade tip fan dia Over 12 000 ft min is considered high by most people 10 000 12 000 is considered typical and expected 8 000 10 000 would be considered low sound Below 8 000 is difficult to hear above the water noise For more severe cases requiring the lowest possible fan sound levels the Marley Ultra Quiet Fan option is now available on all AV models Tower height may increase slightly obtain current sales drawings from your Marley sales representative for accurate dimensions eOnPXx SPX COOLING TECHNOLOGIES INC 7401 WEST 129 STREET OVERLAND PARK KANSAS 66213 USA P 913 664 7400 F 913 664 7439 spxcooling spx com spxcooling com In the interest of technological progress all products are subject to design and or material change without notice ISSUED 12 2014 AV TS 14A COPYRIGHT 2014 SPX Corporation
14. this bulletin for preliminary layouts only Obtain current 4 Standard overflow is a 4 dia connection in the collection basin wall drawings from your Marley sales representative All table data is per on the air inlet side of the tower A 3 dia drain connection is located cell below the overflow See page 7 for details 2 Last numeral of model number indicates number of cells Change as 5 Outlet sizes vary according to GPM and arrangement See pages 6 and appropriate for your selection 7 for outlet sizes and details Nominal tons are based upon 95 F HW 85 F CW 78 F WB and 3 6 Makeup water connection may be 1 or 2 dia depending upon tower GPM ton heat load water pressure and desired connections See page 6 for additional information AV Cooling Tower Engineering Data Schematic Use this data for preliminary layouts only Obtain current drawing from your Marley sales representative x UPDATE web based selection software available S at spxcooling com update provides AV cooling tower ni qv model recommendations based on customer s specific design requirements Y ANK KD ro Ae SS M EN TUI ARA Wd WSS MARLEY HC VAL INLET r INLET FACE INLET SHORT RADIUS OPTION ELBOW 33 4 BY OTHERS 2 a M S 7 Bi 11 3 V i it I v qos z z P INLET PIPING BASE
15. tower varies directly with the heat load applied In is 40 106 160 addition to evaporation water is normally lost to the blow down bleed off necessary to maintain dissolved solids 50 117 167 concentration at an acceptable level in the circulating water system NOTE The AV tower is equipped with a float operated me 2 ct water pressure exceeds 50 psig use pressure reducer ahead chanical makeup va ves to automatically replenish this lost For flow requirements exceeding the above limitations use multiples of water The following tables calculated for a concentration i heceama size valve of 3 times normal indicate the rate of water loss and the size of valve s required If your installation s cold water basin will drain by gravity to a remote storage tank or if you plan a separate means of controlling makeup water we offer a price reduction for deleting the makeup valve AV Cooling Tower Engineering Data Piping SUCTION CONNECTION WELDING BEVEL SEE TABLE FOR SIZE BASE OF _ TOWER MECHANICAL COUPLING GROOVE SUCTION HOOD REMOVABLE 103 s
16. 0 Outlet piping can be kept below the cold water basin 1090 13 i 5 20 level by choosing a bottom outlet connection in lieu of the legg 1g 22 ee 9n ie side suction Bottom outlet design conform to standard 2000 13 25 38 50 75 100 class 125 ANSI pipe flange specifications All outlet ar 3000 19 38 57 75 113 150 rangements include easily removable debris screens 4000 25 50 75 100 150 200 Multicell towers intended to operate together as a com 5000 32 63 94 125 188 250 mon unit are joined by steel flumes between the collection 6000 38 75 113 150 225 300 basins These flumes equalize the operating water level 8000 50 100 150 200 300 400 between basins and also provide a flow passage from cells not equipped with outlets or makeup valves often eliminat NOTE ing the need to specify an outlet and makeup valve for f circulating water is to be maintained at 2 concentrations instead of 3 each cell on a multicell installation Refer to sales drawings multiply table gpm values by 1 36 before sizing makeup valve to obtain flow values of suctions and bottom outlets for multicell installations The best choice for a tower used with a remote or indoor storage tank see page 1 1 or on a concrete cold Makeup Valve Flow Capacities GPM water basin is usually a bottom outlet with or without Screen while flowing psig Valve Valve 10 56 90 MAKEUP 20 78 120 The amount of water constantly evaporated from a 30 99 143 cooling
17. 0 4540 AV6102C 157 8 4 14 876 8 71 11 617 19 3 51 To 8489 4639 AV6103C 167 10 8662 4812 AV6104C 195 15 8760 4910 AV6200C 172 5 10953 5490 AV6201C 193 Th 1051 5588 AV6202C 213 10 1090 5627 11 10 14 876 12 1 11 6 Ae 12 3 s AV6203C 229 15 1399 5936 AV6204C 259 20 1435 5972 AV6205C 275 25 1609 6146 AV6300C 190 Th 0563 6091 3736 AV6301C 204 10 0609 6137 3782 AV6302C 232 8 4 17 85 8 7 14 65 15 371 15 0882 6410 3969 AV6303C 248 20 0926 6454 4013 AV6304C 264 25 1099 6627 4186 AV6400C 201 71 1196 6358 3735 AV6401C 217 10 1219 6401 3778 AV6402C 246 15 1470 6691 3969 8 4 187 116 8 74 15 1179 16 84 AV6403C 263 20 1510 6731 4009 AV6404C 285 25 1687 6908 4186 AV6405C 302 30 1767 6988 4266 AV6500C 242 10 2619 7028 4113 AV6501C 270 15 2723 7132 4217 AV6502C 288 20 3019 7428 4387 9 10 18 1 10 12 15 11 6 16 8 he AV6503C 311 25 3192 7601 4560 AV6504C 329 30 3277 7681 4640 AV6505C 345 40 3579 7988 4947 AV6600C 279 15 3805 7501 4548 AV6601C 305 20 13902 7538 4585 AV6602C 322 11 10 17 8v 12 1 14 6 e 15 3 e 25 4349 7985 4901 AV6603C 343 30 4429 8065 4981 AV6604C 355 40 4736 8372 5288 AV6700C 293 15 4610 7825 4548 AV6701C 320 20 4647 7862 4585 AV6702C 344 11 10 18 1 e 12 1 15 11 6 16 817 25 14824 8039 4762 AV6703C 365 30 5195 8258 4981 AV6704C 390 40 15502 8565 5288 NOTE 1 Use this bulletin for preliminary layouts only Obtain current 4 Standard overflow is a 4 dia conne
18. Base 24 Specifications Specification Value operating shroud for the fan The top of the fan cylinder shall be equipped with a conical non sagging removable fan guard fabricated of welded 5 16 and 7 gauge rods and hot dip galvanized after fabrication Access Large galvanized steel access doors 30 762 mm wide and a minimum of 42 1067 mm high shall be located in both endwalls for entry into the cold water basin and fan plenum area Access doors shall be operable from inside as well as outside the tower Provide an external platform near the top of the louver face for access to the hot water distribution system The platform shall be galvanized steel bar grating sup ported by galvanized steel framework attached to the tower The platform shall be surrounded by a handrail kneerail and toeboard A permanently attached 1 6 457 2 mm wide aluminum ladder with 3 76 2 mm I beam side rails and 1 25 31 8 mm diameter serrated rungs shall extend from the base of the tower to the top of the handrail Provide a ladder extension for connection to the foot of the external ladder This extension shall be long enough to rise from the roof grade level The installing contractor shall be responsible for cutting the ladder to length attaching it to the foot of the tower ladder and anchoring it at its base A heavy gauge galvanized steel safety cage shall surround the ladder extending from a point approximately 7 0
19. Hot Water Distribution System Replace paragraph 8 1 with the following An open 301L stainless steel basins one above each bank of fill shall receive hot water piped to each cell of the tower These basin components shall be installed and sealed at the factory E Where water quality falls outside the limits indicated in Paragraph 5 1 an all stainless tower is worthy of your consideration AV Cooling Tower Specifications Options 2 Specifications Specification Value and assembled with bolted connections Tap screws shall not be allowed The basins shall be equipped with removable stainless steel covers to keep out leaves and debris and to retard the growth of algae The water distribution system shall be accessible and maintainable during tower fan and water operation Casing Fan Deck Fan Cylinder and Fan Guard Replace paragraph 9 1 with the following The casing and fan deck shall be heavy gauge 301L stainless steel and shall be capable of withstanding the loads described in paragraph 4 1 Fan cylinder extensions shall be provided to elevate the fan discharge to a height of ft ___ above the top of the standard fan cylinder The fan cylinder shall be molded FRP and shall be through bolted to the fan deck to provide a consistently stable operating shroud for the fan The top of the fan cylinder shall be equipped with a conical non sagging removable fan guard fabricated of welde
20. Ib Weight Cell Section AV6100A 117 3 8098 4248 AV6101A 138 5 8135 4285 AV6102A 157 8 4 12 3 6 8 71 11 617 19 3 51 To 8165 4315 AV6103A 167 10 8356 4506 AV6104A 195 15 8454 4604 AV6200A 172 5 10779 5316 AV6201A 193 T 10809 5346 AV6202A 213 10 10837 5374 11 10 12 3 6 12 1 11 6176 121 316 AV6203A 229 15 11192 5729 AV6204A 259 20 11235 lm e AV6205A 275 25 11335 5872 AV6300A 190 Tb 9939 5467 Silio AV6301A 204 10 9969 5497 3142 AV6302A 239 8 4 15 2 8 7 14 65 15 371 15 10248 5776 3335 AV6303A 248 20 10344 5872 3431 AV6304A 264 25 10442 5970 3529 AV6400A 201 71 10573 5735 3112 AV6401A 217 10 10583 5765 3142 AV6402A 246 15 10836 6057 3335 8 4 16 7948 8 7 2 15 1176 16 817 AV6403A 263 20 10932 6153 3431 AV6404A 285 25 11029 6250 3528 AV6405A 302 30 11069 6290 3568 AV6500A 242 10 12019 6428 3513 AV6501A 270 15 12120 6529 3614 AV6502A 288 20 12468 6877 3836 9 10 16 7 e 10 115 16 8 is AV6503A 311 25 12572 6981 3940 AV6504A 329 30 12615 7019 3978 AV6505A 345 40 12780 7189 4148 AV6600A 279 15 13247 6943 3990 AV6601A 305 20 13400 7036 4083 AV6602A 322 11 10 15 2 12 1 14 6 e 15 3 e 25 13774 7410 4326 AV6603A 343 30 13812 7448 4364 AV6604A 355 40 13982 7618 4534 AV6700A 293 15 14052 7267 3990 AV6701A 320 20 14145 7360 4083 AV6702A 344 11 10 16 7 1 12 14 151098 16 8 is 25 14249 7464 4187 AV6703A 365 30 14578 7641 4364 AV6704A 390 40 14748 7811 4534 NOTE 1 Use
21. acturer s cooling tower of similar design PVC is subject to distortion in high water temperatures and the narrow pas sages typical of film type fill are easily clogged by turbid or debris laden water Some of the applications which call for alternative tower designs are Ethylene glycol content can plug fill passages as slime and algae accumulate to feed on the available organic materials Fatty acid content found in processes such as soap and detergent manufacturing and some food process ing fatty acids pose a serious threat for plugging fill passages Particulate carry over often found in steel mills and cement plants can both cause fill plugging and can build up to potentially damaging levels on tower struc ure Pulp carry over typical of the paper industry and food processing where vacuum pumps or barometric condensers are used Causes fill plugging which may be intensified by algae ALTERNATIVE SELECTIONS In addition to the AV Series we offer a full scope of Marley products in various designs and capacities to meet the special demands of specific applications spxcooling com visit us on the web for a complete list of products services publications and to find your nearest sales representative CORROSION RESISTANCE QuadraFlow fiberglass and stainless steel construc tion assures long service life in virtually any environment Five year full product warranty Efficient PVC film fill Un
22. agraph in the Mechanical Equipment section A single pole double throw vibration limit switch in a NEMA 4 housing shall be installed on the mechanical equipment support for wiring into the owner s control panel The purpose of this switch will be to interrupt power to the motor in the event of exces sive vibration It shall be adjustable for sensitivity and shall require manual reset E The Marley Terminal Box simplifies all electrical connections to the cooling tower motor and optional control accessories Eliminates wiring errors in the field Reduces field wiring labor and materials Provides an external access location to internal cooling tower wiring NEMA 4X fiberglass enclosure suitable for corrosive applications Terminal points are well identified UL 508 assembly E Unless specified otherwise a Marley M 5 vibration switch will be provided The requirement for manual reset assures that the cooling tower will be visited to determine the cause of excessive vibration AV Cooling Tower Specifications Options 30 Specifications Basin Heaters Add the following paragraph in the Cold Water Basin section Provide a system of electric immersion heaters and con trols for each cell of the tower to prevent freezing of water in the collection basin during periods of shutdown The system shall consist of one or more stainless steel electric immersion heaters installed in threaded couplings provided in the
23. al platform near the top of the louver face for access to the hot water distribution system The platform shall be galvanized steel bar grating supported by galvanized steel framework attached to the tower The platform shall be surrounded by a handrail kneerail and toeboard A per manently attached 1 6 wide aluminum ladder with 3 l beam side rails and 1 25 diameter serrated rungs shall extend from the base of the tower to the top of the handrail Ladder Extension Add the following to the end of the Hot Water Basin Access Platform paragraph Provide a ladder extension for connection to the foot of the external ladder This extension shall be long enough to rise from the roof grade level The installing contractor shall be responsible for cutting the ladder to length attaching it to the foot of the tower ladder and anchoring it at its base Ladder Safety Cage Add the following to the end of the Hot Water Basin Access Platform paragraph A heavy gauge galvanized steel safety cage shall surround the ladder extending from a point 7 O to 8 0 above the foot of the ladder to the top of the distribution basin access platform handrail Specification Value Periodic inspection and maintenance of a cooling tower distribution system is fundamental to preserving maximum cooling system efficiency All cooling towers crossflow or counterflow are subject to clogging to varying degrees by waterborne contam
24. ation switch overload trip alarms and remote temperature control devices The Specification Value E The cold water basin is the only part of the tower that is subject to periods of stagnant water concentrated with treatment chemicals and customary contaminants It is also the most expensive and difficult part of any tower to repair or replace For these reasons many customers par ticularly those who are replacing older towers choose to specify stain less steel cold water basins Also see the notes on page 25 regarding the standard Cold Water Collection Basin They apply equally well to the stainless steel basin gt gt W If it is your opinion that the control system for the cooling tower be part of the tower manufacturer s responsibility we are in wholehearted agreement with you Who better to determine the most efficient mode and manner of a cooling tower s operation and to apply a system most compatible with it than the designer and manufacturer of the cooling tower Marley variable speed drives are also available for enhanced temperature control energy management and mechanical equipment longevity See specifications on page 21 AV Cooling Tower Specifications Base 29 Specifications Specification Value temperature controller shall be adjustable for the required cold water temperature If a thermostatic controller is used it shall be mounted on the side of the tower with the temperature se
25. blies and V belts shall be war ranted for 18 months FM Approval Available only on multi cell towers Add the following paragraph in the Construction section For applications of two or more cells the tower shall be listed in the current FM Approval Guide E Marley flow control valves have been a E Extensions are available 11 increments to a maximum extension height of 6 10 4 Such extensions may be considered necessary in order to elevate the discharge beyond the bounds of an enclosure Discuss applicability with your local Marley sales representative E Where it is your intention to be able to operate other cells of the tower while the flume cover plate is installed separate outlet connections float valves and overflows must be provided for each cell Likewise this would require separate sensors and controls for basin heater systems if installed favorite of users since the 1950s They remain serviceable for the life of the tower and provide a continuing means of flow regulation between hot water basins and between cells of multi cell towers as well E NEMA premium efficiency motor with a five year warranty enhances the standard five year mechanical equipment warranty of the AV cooling tower E This could have a very beneficial effect upon your fire insurance premi ums Towers not able to meet FM requirements may require the inclusion of a fire protection sprinkler system to achieve a comparable
26. ction in the collection basin wall drawings from your Marley sales representative All table data is per on the air inlet side of the tower A 3 dia drain connection is located cell below the overflow See page 7 for details 2 Last numeral of model number indicates number of cells Change as 5 Outlet sizes vary according to GPM and arrangement See pages 6 and appropriate for your selection 7 for outlet sizes and details Nominal tons are based upon 95 F HW 85 F CW 78 F WB and 3 6 Makeup water connection may be 1 or 2 dia depending upon tower GPM ton heat load water pressure and desired connections See page 6 for additional information AV Cooling Tower Engineering Data Piping 10 OUTLET AND MAKEUP PIPING DETAILS Makeup Water Flow Required gpm to maintain three 3 concentrations Unless otherwise specified single cell towers normally Tower Cooling Range hot water minus cold water have a side outlet suction appropriate for the design water gpm 10 F 15 F 20 F 30 F 40 F flow rate see page 7 This usually assures the lowest 200 2 3 4 5 8 10 possible installed tower elevation Side suction connection pipes extend roughly 3 outside the basin and are beveled 200 3 z 9 19 20 for weld connection and also grooved for a mechanical i 12 19 23 20 coupling 800 5 10 15 20 30 4
27. d 5 16 and 7 gauge rods and hot dip galvanized after fabrication Access Replace paragraph 10 1 with the follow ing Large 301L stainless steel access doors 30 762 mm wide and a minimum of 42 1067 mm high shall be located in both endwalls for entry into the cold water basin and fan plenum area Access doors shall be operable from inside as well as outside the tower Replace paragraph 10 5 with the follow ing Provide an internal platform approxi mately 7 2134 mm below the level of the fan for access to the mechanical equipment The platform shall be gal vanized steel bar grating supported by stainless steel framework attached to the tower The platform shall be surrounded by a handrail and kneerail A permanently attached 1 6 457 2 mm wide alumi num ladder with 3 76 2 mm I beam side rails and 1 25 31 8 mm diameter serrated rungs shall extend from the cold water basin to the top of the handrail AV Cooling Tower Specifications Base T Stainless Steel Collection Basin Replace paragraph 11 1 with the follow ing The collection basin shall be 301L stainless steel construction assembled with bolted connections Tap screws shall not be allowed Only low carbon stainless steel alloys will be accepted in order to minimize the risk of intergranular corrosion in the weld zones The basin shall include the number and type of suction connections required to accom modate the outflow piping system sh
28. ed connections See page 6 for additional information AV Cooling Tower Engineering Data Schematic MARLEY HC VAL OFTION Use this data for preliminary layouts only Obtain current drawing from your Marley sales representative UPDATE web based selection software available at spxcooling com update provides AV cooling tower model recommendations based on customer s specific design requirements INLET PIPING INLET FACE INLET SHORT RADIUS ELBOW BY OTHERS 8 INLET 3 11 812 y TOWER G8 INLET K 1 15 e r INLET FACE x INSTALLED HEIGHT BASE OF 2 8 INLET PIPING BY OTHERS INLET PIPING DETAILS LF BY OTHERS BASE OF 8 INLET PIPING T TOWER 351 2 HINGED ACCESS DOOR AV Cooling Tower Engineering Data Schematic g Shipping Weight Tower Nominal Dimensions Design ib Motor Operating Model Tons le 2 le hp Wt Cell Heaviest noie 18 H A S Ib Weight Cell 5 Section AV6100C 117 3 8358 4508 AV6101C 138 5 839
29. embled film fill industrial duty stainless steel cooling tower situated as shown on the plans The limiting overall dimensions of the tower shall be ft wide ft long and ft high to the top of the fan guard Total operating power of all fans shall not exceed Hp consisting of Hpmotor s Tower shall be similar and equal in all respects to Marley Model Replace paragraph 5 1 with the follow ing Except where otherwise specified all components of the cooling tower shall be fabricated of 301L stainless steel The ower shall be capable of withstanding water having a chloride content NaCl up o 750 ppm a sulfate content SO4 up 1200 ppm a calcium content up to 800 ppm and silica SiOo up to 150 ppm The circulating water shall con ain no oil grease fatty acids or organic solvents Fiberglass casing polyurethane barriers and thermosetting hybrids and he components that are adhered to the sheet metal surface shall be considered non recyclable and not allowed Fill Louvers and Drift Eliminators Replace paragraph 7 1 with the following Fill shall be film type thermoformed of PVC with louvers and eliminators formed as part of each fill sheet Fill shall be suspended from stainless steel structural tubing supported from the tower structure and shall be elevated above the floor of the cold water basin to facilitate cleaning The air inlet face of the tower shall be free of water splash out
30. eration if VFD has failed The VFD system shall receive a speed reference signal from the building man agement system monitoring the tower cold water temperature As an option to Specification Value E The Marley basin heater components described at left represent our recommendation for a reliable automatic system for the prevention of basin freezing They are normally shipped separately for installation at the jobsite by the installing contractor When purchased in conjunction with the enhanced Control System option however they are customarily factory mounted and tested When zinc ions are present in basin water copper immersion heaters must not be used Insist upon stainless steel The ambient air temperature that you insert in the specifications should be the lowest 1 level of winter temperature prevalent at site E Marley Variable Speed Drive systems are designed to combine absolute temperature control with ideal energy management The cooling tower user selects a cold water temperature and the drive system will vary the fan speed to maintain that temperature Precise temperature control is accomplished with far less stress to the mechanical equipment compo nents The improved energy management provides energy savings to the user Motors operated on a VFD shall carry a service factor of 1 0 When operating on a VFD the drive parameters should be programmed to limit the current to motor nameplate hp Adjust the
31. f their materials of manufacture The tower shall include all design and material modifications necessary to meet the requirements of Factory Mutual The product proposed shall be listed in the FM Approval Guide latest edition E In the history of cooling towers no other coating for carbon steel has exhibited the success and longevity of galvanization in exposure to the normal cooling tower water quality defined at left No paints or electro statically applied coatings however exotic they may be can approach galvanization s history of success Except for those unusual operating situations where the circulating water may be so laden with suspended solids algae fatty acids product fibers active organisms reflected in BOD and the like that plugging of the fill is a probability reasonable attention to the construction materials and or their coatings is all that is normally required If your preference is for a stainless steel tower or if your water or air quality suggests that the use of stainless steel is prudent see stainless steel options on page 26 AV Cooling Tower Specifications Base 21 Specifications Specification Value Mechanical Equipment Fan s shall be propeller type incorporating heavy duty aluminum alloy blades attached to galvanized hubs with stainless steel U bolts and hardware Blades shall be attached to hubs with stainless steel hardware and shall be individually adjustable Fan s shall
32. he following after the first sen tence Fan cylinder extensions shall be provided to elevate the fan discharge to a height of ft above the top of the standard fan cylinder Equalizer Flume Weir Gates Add the following paragraph under Cold Water Collection Basin The intercon necting flume between cells shall be equipped with a removable cover plate to permit the shutdown of one cell for maintenance purposes or to permit inde pendent cell operation Marley Control Valve Add the following paragraph under Hot Water Distribution System A heavy duty industrial grade flow control valve shall be provided at the inlet to the hot water basin The valve shall permit both flow balancing on multicell towers and tempo rary shut off for maintenance of selected cells Valve shall have a machined cast iron body with stainless steel operating stem and heavy duty locking handle Premium Efficiency Motor Replace paragraph 6 3 with the follow ing The fan and fan drive assembly for each cell shall be supported by a rigid welded hot dip galvanized steel structural support that resists misalignment The mechanical equipment assembly shall be warranted against any failure caused by defects in materials and workmanship for no less than five 5 years following the date of tower shipment This war ranty shall cover the fan speed reducer motor drive shaft and couplings and the mechanical equipment support The bear ing assem
33. ification means that the tower has been tested under operating condi tions and found to perform as rated by the manufacturer under those circum stances It assures the buyer that the tower is not intentionally or inadvertently undersized by the manufacturer E However CTI certification alone is not sufficient to assure you that the tower will perform satisfactorily in your situation Certification is estab lished under relatively controlled conditions and towers seldom operate under such ideal circumstances They are affected by nearby structures machinery enclosures effluent from other towers etc Responsible and knowledgeable bidders will take such site specific effects into consider ation in selecting the tower but the specifier must insist by the written specification that the designer manufacturer guarantee this real world performance Any reluctance on the part of the bidder should cause you some concern 95Y 90Y eo a eo 4 5 F RANGE lt gt 10 RANGE A 15 F RANGE xi COLD WATER TEMP E g 2 T 2 E 8 50 55Y 60Y 65Y 70Y 75Y 80Y WET BULB TEMP F E The design wind and seismic loads at the left are the minimum allow ables for any model in the line under accepted design standards Some models can withstand greater loads as listed below Model Wind Seismic AV61 and AV62 30 psf 7g AV63 thru AV65 20 psf 3g AV66 and AV67 20 psf 46g If y
34. iliently mounted to fan hub and individually adjustable Fan blades shall be open cavity with suitable drainage to avoid accumulation of moisture Foam filled blades are not allowed due to potential moisture contamination of the foam core causing an imbalance of the fan leading to vibration issues Fan s shall be driven through an industrial grade system of V belts pulleys and tapered roller bearings Bearings shall be rated at 50 000 hours or greater Variable Water Flow Distribution Add the following to the end of this paragraph The water distribution system shall be equipped with a method to operate under variable flow conditions while maintaining a uniform air side pressure drop through the fill to maximize cooling efficiency and minimize the risk of ice and scale formation in the fill System must accommodate flow rates down to of design flow E The Marley Quiet Package includes the affordable Quiet Fan mechanical option optimized to achieve the lowest possible sound levels while maintaining efficiency In combination with a Marley Variable Speed Drive this package is capable of meeting all but the most restrictive sound limitations Tip Speed unlike thermal performance no certification program exists for sound While Marley conducts actual sound tests on all its configurations there are a few ways for the client to ensure they get a quiet tower One is to conduct a field sound test after installation On site
35. inants such as pipe scale and sedi ment Therefore safe and easy access to these compo nents is of significant value to the operator Access can be provided in a number of ways including portable ladders or scaffolding but for maximum safety and convenience a fac tory installed Marley access platform with guardrails makes this task as safe and user friendly as possible Further its location on the side of the tower does not add to the height of the unit preserving architectural integrity See graphic Page 14 It also saves the owner time and money in that maintenance personnel may devote their time to inspection rather than searching for ladders or erection of portable scaffolding E Many towers are installed such that the base of the tower is 2 0 or more above the roof or grade level This makes it difficult to get up to the foot of the attached ladder The ladder extension alleviates this problem Marley ladder extensions are available in standard 5 0 and 11 0 lengths To meet OSHA guidelines towers whose distribution basin access plat forms are 20 0 or more above roof or grade and which are equipped with external ladders should have safety cages surrounding the ladders AV Cooling Tower Specifications Options 33 Specifications Specification Value Mechanical Equipment Access Platform Available only on AV63000 models and larger Add the following paragraph in the Access section Provide an internal platfo
36. ipped with a method to operate under variable flow conditions while maintaining a uniform air side pressure drop through the fill to maximize cooling efficiency and minimize the risk of ice and scale forma tion in the fill System must accommodate flow rates down to of design flow Casing Fan Deck Fan Cylinder and Fan Guard The casing and fan deck shall be heavy gauge galvanized steel and shall be capable of withstanding the loads described in paragraph 4 1 Fan cylinder extensions shall be provided to elevate the fan discharge to a height of ____ ft ___ above the top of the standard fan cylinder The fan cylinder shall be molded FRP and shall be through bolted to the fan deck to provide a consistently stable E Gravity flow distribution basins are a feature of crossflow type towers resulting in operating pump heads of from 10 to 20 feet less than that encountered in counterflow towers with pressurized spray systems Also these basins are out where they can be easily inspected even main tained while the tower is in operation Spray systems of counterflow towers sandwiched between the top of the fill and the drift eliminators are extremely awkward to access and maintain If your preference is for a stainless steel tower or if your water or air quality suggests that the use of stainless steel is prudent see stainless steel options on page 26 IND EM eo AV Cooling Tower Specifications
37. iquely different and architecturally attractive Sigma available in wood fiberglass HDG steel or stainless steel structure Field erected for medium to large projects Available in a wide range of sizes Efficient PVC film fill SPLASH FILL NC alpha available in galvanized steel and stainless steel with splash type fill Excellent in dirty water ap plications AV Cooling Tower Specifications Base 18 Specifications Specification Value Base Provide an induced draft crossflow type factory assembled film fill industrial duty galvanized steel cooling tower situated as shown on the plans The limiting overall dimensions of the tower shall be ft wide ft long and ft high to the top of the fan guard Total operating power of all fans shall not exceed hp consisting of ___ hp motor s Tower shall be similar and equal in all respects to Marley Model The cooling tower shall be designed for quiet operation and shall pro duce an overall level of sound not higher than dB A mea sured at ft from the location Sound levels shall be measured with a Type 1 preci sion system and in full conformance with ATC 128 test code published by the Cooling Technology Institute CTI The measurement system shall have a real time frequency analyzer and separate microphones with an overall tolerance 3 dB All low sound options shall be CTI Certified for thermal performance Wi You
38. l changes A drift rate of 0 001 is readily available on many stan dard models If a lower rate is required please discuss with your Marley sales representa tive Drift Eliminators AV Cooling Tower Specifications Base 23 Specifications Specification Value Hot Water Distribution System An open basin above the bank of fill shall receive hot water piped to each cell of the tower These distribution basins shall be installed and sealed at the factory with bolted connections Tap screws shall not be allowed The basin shall and shall be equipped with removable galvanized steel covers to keep out leaves and debris and to retard the growth of algae The water distribution system shall be accessible and maintainable during tower fan and water operation Each basin shall include an inlet hole and bolt circle to accept a 1254 flange connection per ANSI B16 1 Removable interchangeable polypropylene nozzles installed in the floor of these basins shall provide full coverage of the fill by gravity flow Heavy duty flow regulator valves shall be provided at the hot water inlet con nections These valves shall be disc type with cast iron bodies and stainless steel operating stems There shall be a locking handle to maintain the valve setting in any position Valves shall be right angle configuration precluding the need for inlet elbows Variable Water Flow Distribution The water distribution system shall be equ
39. level of insur ance premium cost Even if you are not insured by FM this requirement ensures that each cell will contain any fire that may occur without losing the ability of limited operations and capacity AV Cooling Tower Specifications Options 35 Specifications Specification Value approvalguide com and conform to the FM Approval Standard for Cooling Towers Class Number 4930 that is approved for use without sprinkler systems The tower shall have successfully passed full scale fire testing static and cyclic wind pressure testing large missile impact testing for Zone HM and structural design evaluation as administered by FM Approvals A copy of the FM Approval Certificate of Compliance dated November 2013 or later shall be available upon request Quiet Fan Replace paragraph 6 1 with the following Quiet Fan s shall be propeller type incorporating a minimum of seven heavy duty aluminum alloy blades attached to galvanized hubs with stainless steel U bolts and hardware and shall be individually adjustable Fan s shall be driven through an industrial grade system of V belts pulleys and tapered roller bearings Bearings shall be rated at 50 000 hours or greater Ultra Quiet Fan Replace paragraph 6 1 with the following Ultra Quiet Fan s shall be propeller type incorporating wide chord acoustic geometry corrosion and fire resistant marine grade aluminum blades and aluminum hubs Blades shall be res
40. m outlet Side outlet suction is not recommended for gravity flow 2 GPM limits are based on single cell or multicell towers with a single outlet per cell For multicell towers connected with collection basin flumes and less than one outlet per tower cell consult your Marley sales representative for more specific information AV Cooling Tower Engineering Data Support OVERALL OF BASIN OVERALL OF BASIN 18 1 4 ANCHOR ANCHOR 4 BOLT BOLT T 58 2 o 2 HOLES FOR HOLES FOR 1 2 DIA ANCHOR V2 DIA ANCHOR l BOLTS 4 REQD BOLTS 4 REGD 11 8 1 4 1 2 11 8 12 11 4 1 2 IP 1 i 28 id ze 2 v o ES Lo TOWER COLLECTION BASIN AIR INLET FACE TOWER COLLECTION BASIN AIR INLET FACE OPTION ONE OPTION TWO TOWER COLLECTION Dimensions Design Operating Design Operating BASIN Tower Model Weight Cell Load at Anchor 7 E 1 D Ib Ib To SUPPORT 1 2 WASHER REQD AV6100 8 4 8 2 8435 2815 BY OTHERS BY OTHERS AV6200 11 10 EON 11314 3824 k NORMAL GAUGE AV6300 8 4 8 2 10370 3436 AV6400 8 4 627 11024 3636 SECTION A AV6500 9 10 9 8 12709 4203 AV6600 iP is 18912 4709 AV6700 11 10 11 8 14791 4939 AV Cooling Tower Engineering Data Support
41. n a coupling provided in the side of the collection basin Live steam as required is injected directly into the wa ter Condensed steam adds water to the basin and the excess will exit the overflow of the tower INDOOR STORAGE TANK With this type of system water flows from an indoor tank hrough the load system and back to the tower where it is cooled The cooled water flows by gravity from the tower to he tank located in a heated space At shutdown all exposed water drains into the tank where it is safe from freezing The amount of water needed to successfully operate he system depends on the tower size and GPM and on the volume of water contained in the piping system to and from he tower You must select a tank large enough to contain hose combined volumes plus a level sufficient to maintain a flooded suction on your pump Control makeup water accord ing to the level where the tank stabilizes during operation SOUND CONTROL Sound produced by an AV Series tower operating in an unobstructed environment will meet all but the most restrictive noise limitations and will react favorably to natural attenuation Where the tower has been sized to operate within an enclosure the enclosure itself will have a damping effect on sound Sound also declines with distance by about 6 dBA each time the distance doubles All standard AV cooling towers are equipped with low sound fans This in combination with zero splash crossflow film
42. normal air conditioning and refrigeration systems as well as light industrial loads They evolve from a singleflow concept of towers pioneered by Marley in the 1950s and incorporate all of the design advancements that our customers have found valuable They represent the current state of the art in this cooling tower category This booklet not only relates the language to use in describing an appropriate AV cooling tower but also defines why certain items and features are important enough to specify with the intention of insisting upon compliance by all bidders The left hand column of pages 18 thru 35 provides appropriate text for the various specification paragraphs whereas the right hand column comments on the meaning of the subject matter and explains its value Pages 18 thru 25 indicate those paragraphs which will result in the purchase of a basic cooling tower one that accomplishes the specified thermal performance but which will lack many operation and maintenance enhancing accessories and features that are usually desired by those people who are responsible for the continued and continuing operation of the system of which the tower is part It will also incorporate those standard materials which testing and experience has proven to provide acceptable longevity in normal operating conditions Pages 26 thru 35 provide paragraphs intended to add those features components and materials that will cust
43. nsing bulb installed in the cold water basin using a suspension mounting bracket If a solid state temperature controller is used the controller will be door mounted on the control panel The solid state temperature controller will display two temperatures one for outgoing water and the other for set point Water temperature input shall be obtained using a three wire RTD with dry well in the outlet water piping and wired back to the solid state temperature controller in the control panel Terminal Box Add the following paragraph in the Mechanical Equipment section A factory installed terminal box shall be furnished and mounted to the outside of the tower where applicable The fan motor and optional com ponents including the vibration switch and water level probes shall be factory wired to terminal points inside the terminal box Optional tower components which ship loose including the oil level switch and immersion heaters shall be field wired to the terminal box Enclosure shall be NEMA 3R or NEMA 4X with hinged and lockable door meeting UL and CSA standards Terminal box shal include lockable stainless steel snap latch door fasteners terminal blocks marked with wire numbers sub pan and a wiring dia gram Complete assembly shall be built to UL 508A standards Conduit entry and exit points shall be the bottom of the enclosure preventing water collection in the enclosure Vibration Limit Switch Add the following par
44. omize the tower to meet the user s requirements AV Cooling Tower Engineering Data Schematic 4 Use this data for preliminary layouts only Obtain current drawing from your Marley sales representative UPDATE web based selection software available a SW 7 at spxcooling com update provides AV cooling ot N x tower model recommendations based on customer s ro Ae SS M EN TUI specific design requirements WSS MARLEY HC VAL INLET r INLET FACE INLET SHORT RADIUS OPTION ELBOW 33 4 BY OTHERS Z EEN a M S 7 Bi 11 3 N i m 1 l A d f 2 z P INLET PIPING BASE OF 8 INLET PIPING Y BY OTHERS TOWER BY OTHERS e INLET PIPING DETAILS 1 1576 r INLET FACE 11 82 31 2 Log e INLET A BASE OR TOWER HINGED ACCESS DOOR AV Cooling Tower Engineering Data Schematic 5 Shipping Weight Tower Nominal Dimensions Design ib Motor Operating Model Tons te 2 te hp Wiel Heaviest note note L H A S
45. our application requires higher loads consult your Marley sales rep resentative These standards give you assurance that the tower can be shipped handled hoisted and ultimately operated in a normal cooling tower environment AV Cooling Tower Specifications Base 20 Specifications Specification Value Construction Except where otherwise specified all components of the cooling tower shall be fabricated of heavy gauge steel protected against corrosion by G 235 galvanizing The tower shall be capable of withstand ing water having a pH of 6 5 to 8 0 chloride content NaCl up to 500 ppm a sulfate content S04 up to 250 ppm a calcium content up to 500 ppm and silica SiOo up to 150 ppm The cir culating water shall contain no oil grease fatty acids or organic solvents Fiberglass casing polyurethane barriers and thermo setting hybrids and the components that are adhered to the sheet metal surface shall be considered non recyclable and not allowed The specifications as written are intend ed to indicate those materials that will be capable of withstanding the above water quality in continuing service as well as the loads described in paragraph 4 1 They are to be regarded as minimum require ments Where component materials pecu liar to individual tower designs are not specified the manufacturers shall take the above water quality and load carrying capabilities into account in the selection o
46. ower size This is the least desirable approach because of the significant cost impact and because of the obstruction to normal maintenance procedures Although not an industry requirement all published sound data on Marley cooling towers are in accordance with CTI ATC 128 so you can be assured of sound data accuracy ENCLOSURE Occasionally cooling towers are located inside architectural enclosures for aesthetic reasons Although AV Series towers adapt well to enclosures the designer must realize the potential impact of a poorly arranged enclosure on the tower s performance and operation The designer must take care to provide generous air inlet paths and the tower s fan cylinder discharge height should not be lower than the elevation of the top of the enclosure Obtain a copy of Marley Technical Report H 004 External Influences on Cooling Tower Performance from your Marley sales representative AV Cooling Tower Engineering Data Operational and Environment Awareness 16 As suggested the aforementioned Technical Report it may also be advisable to specify a design wet bulb temperature 1 F higher than normal to compensate for potential recirculation initiated by the enclosure You ll benefit from discussing your project with your Marley sales representative SYSTEM CLEANLINESS Cooling towers are very effective air washers Atmospheric dust able to pass through the relatively small louver openings will enter the circula
47. own on the plans Suction connections shall be equipped with stainless steel debris screens A factory installed float oper ated mechanical make up valve shall be included An overflow and drain connec tion shall be provided in each cell of the cooling tower The basin floor shall slope toward the drain to allow complete flush out of debris and silt that may accumu late Towers of more than one cell shall include a method for flow and equaliza tion between cells The basin shall be accessible and maintainable while water is circulating All steel items that project into the basin shall also be made of stain less steel Control Options Fan Motor Starter Control Panel Add the following paragraph to the Mechanical Equipment section Each cell of the cooling tower shall be equipped with a UL CUL 508 listed control panel in a NEMA or 4X outdoor enclosure capable of controlling single speed or two speed motors as required and designed specifically for cooling tower applications The panel shall include a main circuit breaker with an external operating handle lockable in the off position for safety Full voltage non reversing magnetic starter shall be controlled with a thermostatic or solid state temperature controller Door mounted selector switches shall be provided to enable automatic or manual control and wired for 120VAC control Control circuit to be wired out to terminal blocks for field connection to a remote vibr
48. r specification base establishes the type configuration base material and physical limitations of the cooling tower to be quoted During the planning and layout stages of your project you will have focused your attention on a cooling tower selection that fits your space allotment and whose power usage is acceptable Limitations on physical size and total operating horsepower avoid the introduction of unforeseen operational and site related influences Specifying the number of cells and the maxi mum fan hp cell will work to your advantage The benefit of crossflow towers is that they are inherently easy to oper ate access and maintain Unlike counterflow towers they have a spa cious full height plenum for easy access to all of the tower s internal components and the water distribution system is readily open to view and cleaning If your preference is for a stainless steel tower or if your water or air quality suggests that the use of stainless steel is prudent see stainless steel options on page 26 Ladder and access platform are optional accessories See Page 24 for specification wording The ladder can be located on either end of the platform by simple field rearrangement of handrails and posts AV Cooling Tower Specifications Base 19 Specifications Thermal Performance The tower shall be capable of cooling gpm of water from F to F at a design entering air we
49. rm approximately 7 below the level of the fan for access to the mechanical equipment The platform shall be galva nized steel bar grating supported by gal vanized steel framework attached to the tower The platform shall be surrounded by a handrail and kneerail A permanently attached 1 6 wide aluminum ladder with 3 I beam side rails and 1 25 diameter serrated rungs shall extend from the cold water basin to the top of the handrail Wi Periodic inspection and maintenance of cooling tower fans motors and other rotating equipment is fundamental to preserving maximum cooling System efficiency All mechanical draft cooling towers forced or induced draft are subject to vibration and wear Therefore safe and easy access to these components for inspection and maintenance is of significant value to the operator Access can be provided in a number of ways including portable lad ders or scaffolding but for maximum safety and convenience a factory installed Marley access platform with guardrails makes this task as safe and user friendly as possible See graphic below It also saves the owner time and money in that maintenance personnel may devote their time to inspection rather than searching for ladders or erection of portable scaf folding 11 3 AV Cooling Tower Specifications Options 34 Specifications Specification Value Miscellaneous Options Fan Cylinder Extensions Insert t
50. side of the basin A NEMA 4 enclosure shall house a magnetic contactor to energize heaters a transformer to provide 24 volt control circuit power and a solid state cir cuit board for temperature and low water cutoff A control probe shall be located in the basin to monitor water level and tem perature The system shall be capable of maintaining 40 F water temperature at an ambient air temperature of F Fan Motor Variable Speed Drive ACH550 VFD System Add the following paragraph in the Mechanical Equipment section A com plete UL listed Variable Speed Drive system in a NEMA 1 indoor NEMA 12 indoor or NEMA 3R outdoor enclosure shall be provided The VFD shall use PWM technology with IGBT switching VFD output switching signal shall be programmed to not cause mechanical vibration issues with backlash in gear box teeth or vibration issues associated with long driveshafts The VFD shall be programmed for variable torque applica tions and shall catch a fan spinning in the forward or reverse direction without tripping VFD panel construction shall include a main disconnect with short cir cuit and thermal overload protection with external operating handle lockable in the off position for lock out tag out safety procedures A service switch directly ahead of the VFD shall be provided for voltage isolation during VFD maintenance An integrated full voltage non reversing bypass starter shall be furnished allow ing fan motor op
51. sign for 30 psf wind and or 7g seismic loading for AV61 and AV62 20 2 Grillage anchorage Option Three is not intended for use with the Bot psf wind and or 3g for AV63 thru AV65 and 20 psf wind and or 46g tom Outlet Option for AV66 and AV67 Anchorage capacity for Supporting Steel Options 3 Multicell installations shall conform to arrangements shown The stan Three and Four are less and will vary with the beam spacing dard spacing between the side face anchor bolts is 510 7 Tower may be placed on a flat concrete slab Side outlet must be 4 Purchaser to provide tower support complete with holes and anchor specified See pages 6 and 7 and consult your Marley application sales bolts Do not use studs Anchor points must be framed flush and level at representative top 8 Tower may be supported from piers at each anchor bolt location as a 5 Design operating weight occurs with collection basin full to overflow support alternative level Actual operating weight varies with GPM and piping scheme AV Cooling Tower Engineering Data Hoisting Information OFFSET REQUIRED FOR BALANCED LIFT 10 O MIN 15 O MIN SLING LENGTH NOTE 1 All hoisting clip holes are 174 2 Overall length of shackle pins should not exceed 514 3 For overhead lifts or where additional safety is required add slings beneath the tower unit When the ambient air temperature falls below 32 F the water in a cooling tower can freeze Marley Technical Report
52. t bulb temperature of F and its thermal rating shall be Certified by the Cooling Tower Institute Performance Warranty CTI Certification notwithstanding the cooling tower manufacturer shall guarantee that the tower supplied will meet the specified performance conditions when the tower is installed according to Plans If because of a suspected thermal performance deficiency the Owner chooses to conduct an on site thermal performance test under the supervision of a qualified disinterested third party in accordance with CTI or ASME standards during the first year of operation and if the tower fails to perform within the limits of test tolerance then the cooling tower manufacturer will pay for the cost of the test and will make such corrections as are appropriate and agreeable to the Owner to compensate for the performance deficiency Design Loading The tower structure and anchorage shall be designed to withstand a wind load of 20 psf 957 Pa as well as 3g seismic load while operating The tower shall be designed to withstand shipping and hoisting loads of 2g horizontal and 3g vertical Handrails where specified shall be capable of withstanding a 200 Ib 890 N concentrated live load in any direction and shall be designed in accordance with OSHA guidelines Fork lift slots shall be provided in the basin side supports to allow handling of the tower at grade level Specification Value CTI Cert
53. the motor once 2596 motor speed is reached and cooling is no longer required The cool ing tower manufacturer shall supply VFD start up assistance Single Point Power Connection A main circuit breaker disconnect provides a true single point power connection for cooling tower controls Contractor connects a single Add the following paragraph in the power source and the panel provides power feeds controls and voltages Mechanical Equipment section Each cell for tower controls Typically each cell of a tower requires one SPPC of the cooling tower shall be equipped panel with a UL CUL 508 listed control panel in NEMA 3R or 4X outdoor enclosure The panel shall accommodate a single source power supply feeder and include electrical circuits and components to power and control all electrical cooling tower components for a single cell The panel shall include a main circuit breaker with an external operating handle lockable in the off position for safety Controls integrated into the panel shall include a fan motor starter basin heater controls and water level controls In the event a VFD is furnished for the fan a feeder breaker in the panel to a remote mounted VFD shall be provided DE DE NR AV Cooling Tower Specifications Options Specifications Convenience and Safety Options Hot Water Basin Access Platform Add the following paragraph in the Access section Provide an extern
54. ting water system Increased concentrations can intensify system maintenance by clogging screens and strainers and smaller particulates can coat system heat transfer surfaces In areas of low flow velocity such as the cold water basin sedimentary deposits can provide a breeding ground for bacteria In areas prone to dust and sedimentation you should consider installing some means for keeping the cold water basin clean Typical devices include side stream filters and a variety of filtration media WATER TREATMENT To control the buildup of dissolved solids resulting from water evaporation as well as airborne impurities and biological contaminants including Legionella an effective consistent water treatment program is required Simple blowdown may be adequate to control corrosion and scale but biological contamination can only be controlled with biocides An acceptable water treatment program must be compatible with the variety of materials incorporated in a cooling tower ideally the pH of the circulating water should fall between 6 5 and 8 0 Batch feeding of chemicals directly into the cooling tower is not a good practice since localized damage to the tower is possible Specific startup instructions and additional water quality recommendations can be found in the AV Series User Manual which accompanies the tower and also is available from your local Marley sales representative For complete water treatment recommendations consult
55. tz regions Incidentally two speed motors are a far better choice than separate pony motors which simply double the prob lems indicated above If your preference is for a stainless steel tower or if your water or air quality suggests that the use of stainless steel is prudent see stainless Steel options on page 26 AV Cooling Tower Specifications Base 2 Fill Louvers and Drift Eliminators Fill shall be film type thermoformed of PVC with louvers and eliminators formed as part of each fill sheet Fill shall be suspended from hot dip galvanized struc tural tubing supported from the tower structure and shall be elevated above the floor of the cold water basin to facilitate cleaning The air inlet face of the tower shall be free of water splash out Drift eliminators shall be PVC triple pass and shall limit drift losses to no more than 0 00590 of the design GPM flow rate Louvers Fill Sheets Specification Value E Louvers integral with the fill keep the flowing water within the confines of the fill The separate external louvers used by others permit water to escape the fill and form ice or produce an unsightly situation adjacent to the tower If you plan to use your tower in the wintertime particularly for free cooling integral louvers will put your operating concerns to rest E Drift rate varies with design water loading and air rate as well as drift eliminator depth and number of directiona
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