Marley NX Fiberglass Cooling Tower - Engineering
Contents
1. Drain Down Maximum Liters Range of Tower Drain Down Design m hr Maximum Liters 23 62 1840 32 87 3049 64 100 1940 8943 143 3227 NX1025 NX1010 NX1015 NOTE 102 141 2097 143 180 2275 182 218 2222 72 116 2416 118 164 2509 166 211 2721 EE 253 2755 NX1020 45200 202 3471 204 289 259 3597 coro 316 3672 Volumes shown are maximums for the flow ranges indicated Actual volumes will usually be less Contact your Marley sales representative for more specific information s o Ra Marley NX Fiberglass Cooling Tower Specifications Base Specifications Specification Value Base Provide an induced draft crossflow type field erected film fill industrial duty fiber glass and hot dip galvanized steel cooling tower situated as shown on the plans The limiting overall dimensions of the tower shall be wide long and high Total operating kW of all fans shall not exceed kW consisting of O kW motor s Tower shall be similar and equal in all respects to Marley Model Thermal Performance and Efficiency The tower shall be capable of cooling m hr of water from ___ C to C at a design entering air wet bulb temperature of C and its thermal rating shall be Certified by GE 1911 2006 The tower shall be capable of a mini mum m hr per kW efficiency per ASHRAE Standard 90 1 and China Efficiency standards Performance Warranty The NX Fiberglass cooling tower shall2. Posts toprails and kneerails shall be 40mm x 25mm rectangular tub ing The guardrail assembly shall be hot dipped galvanized and capable of with standing a 45 kgf concentrated live load in any direction Posts shall be spaced on centers of 150cm or less A 52cm wide HDG ladder shall be permanently attached to the endwall casing of the tower rising from the base of the tower to the top of the guardrail Ladder Extension Add the following to the end of the above paragraph Provide a ladder extension for connection to the foot of the ladder attached to the tower cas ing This extension shall be long enough to rise from the root grade level to the base of the tower 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 paragraph in the Access section A heavy gauge galva nized steel satety cage shall surround the ladder extending trom a point approxi mately 2 6m above the foot of the ladder to the top of the handrail E The NX cooling tower has been designed to minimize the need for maintenance personnel to get on top of the tower to perform maintenance and inspections E Many towers are installed such that the base of the tower is 61cm 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 p
3. not certified and field drift tests are cost pro hibitive for most applications e Drift rates below 0 001 are difficult to measure in the field e Certain water treatment chemicals can impact the drift rate DRIFT ELIMINATOR om m Marley NX Fiberglass Cooling Tower Specifications Base 17 Specifications Specification Value Hot Water Distribution System Two open basins one above each bank of fill shall receive hot water piped to each cell of the tower The water distri bution system shall be accessible and maintainable during tower fan and water operation Removable interchangeable polypropyl ene nozzles installed in the floor of these basins shall provide full coverage of the fill by gravity flow Casing Fan Deck and Fan Guard The casing and tan deck shall be FRP with steel sub structure and shall be capable of withstanding the loads described in paragraph 4 1 The top of the fan cylinder shall be equipped with a conical non sagging removable fan guard and hot dip galvanized after fabri cation Fan cylinders 1 5m in height and over shall not be required to have a fan guard Access A large fiberglass rectangular access door shall be located on the cased faces for entry into the cold water basin Doors shall provide access to the fan plenum area to facilitate inspection and allow maintenance to the fan drive system I Gravity flow distribution basins are a feature of cro
4. The UPDATE web based selection software provides NX model recommendations based on specific design requirements S Ol o Ol o ol O joja 4 Standard overflow is a 4 dia standpipe in the collection basin floor The standpipe removes for flush out and draining 5 Outlet sizes vary according to flow and arrangement See page 10 Design Operating Weight kg 1995 2115 2100 2271 3153 3099 3221 3275 3889 3952 4093 5014 5062 5259 Marley NX Fiberglass Cooling Tower Schematic Details for sump outlet sizes and details 6 Makeup water connection is 1 see page 8 for additional information 7 A 1 quick makeup connection is also included in the collection to allow for quick fill of the tower o 3 D 5 a o 5 w mm 3244 3244 3244 3244 3860 3860 3860 3860 4130 4130 4130 4504 4504 4504 3225 3225 3225 3225 3302 3302 3302 3302 3528 3528 3528 3548 3548 3548 Marley NX Fiberglass Cooling Tower Piping Connection Flanges are not required to make inlet connections An appropriate sized opening with a sealing grommet is furnished on both inlet splash boxes A single riser or dual riser may be used Every tower is equipped with an FRP outlet sump and that may be rotated 90 in order to line up with customer s piping arrangement The outlet is designed for a flanged connection that is field drilled to accommodate various univers
5. toward the drain to allow complete flush out of debris and silt which may accumu late Towers of more than one cell shall include flumes for flow and equalization between cells The basin shall be acces sible and maintainable while water is cir culating A factory installed steel walkway extending from one endwall access door to the other endwall shall be provided The top of the walkway shall be at or above the cold water overflow level Scope of Work The cooling tower manufacturer shall be responsible for the design fabrication and delivery of materials to the project site Unless otherwise specified all supply and return piping pumps controls and electrical wiring will be outside the cool ing tower manufacturer s scope of work E Please be clear in your specifications and inquiry documents regarding the full scope of work expected That will help assure that your bid comparisons will be made on as equal a basis as possible and will help to avoid any misunder standings during the execution and implementation of the contracts No No s oo Marley NX Fiberglass Cooling Tower Specifications Options Specifications Specification Value Convenience and Safety Options Guardrail and Ladder Add the following paragraph in the Access section The top of the tower shall be equipped with a sturdy guardrail complete with kneerail and toeboard designed according to ISO 14122 Part 3 standards
6. 12 C 17 C 24 C If too much water is still being consumed consult your Marley sales representative for water saving alternatives o EE IE III e an 182 9 ar 2 a 4 6 9 1 ai 2 4 is 13 Makeup Valve Flow Capacities m hr while flowing kPa NOTE If circulating water is to be maintained at 2 concentrations instead of 3 multiply table m hr values by 1 36 before sizing makeup valve NOTE e If makeup water pressure exceeds 345 kPa use a pressure reducer ahead of valve e For flow requirements exceeding the above limitations use multiples of the same size valve Marley NX Fiberglass Cooling Tower Piping Connection TOWER INLET tu z DD O O 0 0 O zO aO anO Oa O 0 O 7 6 6 S OQ EO o O o Or Or Or O tu ari Z a mias a j Pe Lu z Fam caes O E o o o So so o a o O O O O O O ia Z a TOP OF INLET FLANGE a J INLET ELEVATION SINGLE CELL Model NX1010 NX1015 NX1020 NX1025 Inlet Diameter size in 2 et I 2 at 5 2 at 6 Dabo Marley NX Fiberglass Cooling Tower Outl
7. Each model s ASHRAE Standard 90 1 rating can be viewed in our online sizing and selection software at spxcooling com update I Certification alone is not sufficient to assure you that the tower will perform sat isfactorily in your situation Certification is established 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 consideration 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 Marley NX Fiberglass Cooling Tower Specifications Base Specifications Specification Value Design Loading The tower structure anchorage and all its components shall be designed by licensed structural engineers per the International Building Code to withstand a wind load of 49 kg m psf The fan deck and hot water basin covers shall be designed for 2 4kPa live load or a 91kg concentrated load Guardrails where specified shall be capable of withstand ing a 450N concentrated live load in any direction Conforms to ISO 14122 Aprt 3 standards 45 kgf Construction Except where otherwise specified all components of the cooling tower shall be fabricated
8. Lenntech SPK info lenntech com Te 31 152 610 900 Fax 31 152 616 289 www lenntech com Engineering Data amp Specifications 7 a d hi J i ba 1 1 1 id T ade 4 a me O mE gt STE gt Marley Marley NX Fiberglass Cooling Tower Specifications Base Engineering Data Sound Control Water Quality Schematics Piping Connections Support Freeze Prevention Specifications Base Base Thermal Performance Performance Warranty Design Loading Construction Mechanical Equipment Fill Louvers and Drift Eliminators Hot Water Distribution System Casing Fan Deck and Fan Guard Access Collection Basin Scope of Work Specifications Options Convenience and Safety Options Guardrail and Ladder Ladder Safety Cage Access Door Ladder Ladder Safety Gate Miscellaneous Options Sound Control Hot Water Basin Covers Steel Foundation Piers N 00 O 2 of 13 13 13 14 14 15 16 17 17 17 18 18 19 19 20 20 20 21 21 Marley NX Fiberglass Cooling Tower NX Fiberglass towers are fiberglass with galvanized steel sub structure field erected crosstlow cooling towers designed to serve air conditioning and refrigeration systems as well as light to medium industrial process loads on clean water The Marley NX Fiberglass cooling tower has been designed specitically for sound control and tonnage density and incorporates field proven indust
9. al piping standards A drain connection is also located in the sump Makeup The amount of water constantly evaporated from a cooling tower varies directly with the heat load applied In addition to evaporation water is normally lost to the blowdown bleed off necessary to maintain dissolved solids concentration at an acceptable level in the circulating water system The NX is equipped with one or more float operated mechanical makeup valves to automatically replenish this lost water The tables on this page calculated for a concentration 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 a price reduction is available for deleting the Marley valve s An additional 1 quick makeup connection is provided to allow for quick fill of the tower See NX User Manual for more information In most instances cooling towers will see the highest water usage at design heat load Off design conditions 99 of the time water usage will be less For a better understanding of how much water your application will use throughout the year consult our water usage calculator at Makeup Water Flow Required m hr to Maintain Three 3 Concentrations Cooling Range hot water minus cold water spxcooling com watercalc Tower m hr ac ec ec E E
10. and significantly higher wind and seismic loads If your geographic location dictates higher wind load or seismic load values please make the appropriate changes after discussion with your Marley sales representative 49 kg m windload applicable for most applications but consult the local code official for actual requirements 2 4kPa live load 450N concentrated load ensures the tower can be safely accessed for routine maintenance when a guardrail is installed as well ensuring the end user complies with government safety laws 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 electrostatically applied coatings or rubberized compounds however exotic they may be can approach galvaniza tion 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 Marley NX Fiberglass Cooling Tower Specifications Base Specifications Specification Value Mechanical Equipment Fan s shall be propeller type incorporat ing aluminum alloy blades and galvanized hubs Blades shall be i
11. closure the enclosure itself will have a damping effect on sound Sound also declines with distance by about 5 or 6 dB A each time the distance doubles e Where only a slight reduction in noise will satisfy and the source of concern is In a particular direction merely turning the cooling tower may be the answer Less sound emanates from the cased face of the cooling tower than does from the air intake face E Tip Speed unlike thermal performance no certification program exists for sound While Marley conducts actual sound tests on all its configurations there are only a few ways for the client to ensure they get a quiet tower e One is to conduct a field sound test after installation On site testing after installation can however be inaccurate depending on the environment e Specifying fan blade tip speed is one way to physically force the tower selec tion to be quiet Tip speed is easily checked by multiplying the fan rpm by the fan circumference at the blade tip x fan dia Over 61m s is considered high by most people 51 61 is considered typical and expected 41 51 would be con sidered low noise Below 41 is difficult to hear above the water noise ISS H pr cmi Marley NX Fiberglass Cooling Tower Specifications Options e Specifications Specification Value Hot Water Distribution Basin E Hot water basin covers keep most air bourne debris out of the circulating water Covers which can clog distribution nozzles T
12. 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 teeding 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 NX User Manual which accompanies the tower and also is available from your local Marley sales representative For complete water treatment recommendations consult 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 Typical Applications The NX tower is an excellent choice for 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 The NX can also be use
13. d in the cooling of jacket water for engines and air compressors and are widely applied to dissipate waste heat in a variety of industrial power and manufacturing processes Applications Requiring Alternative Cooling Tower Selections Certain types of applications are incompatible with any cooling tower with film fil whether NX or a competitive tower of similar manufacture Film fill is subject to distortion in high water temperatures and the narrow passages are easily clogged by turbid or debris laden water Some of the applications which call for alternative tower designs are e Water temperatures exceeding 52 C adversely affects the service life and performance of normal PVC fill 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 processing fatty acids pose a serious threat for plugging Till 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 structure e 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 NX SPX Cooling Technologies offers a Tull scope of products in
14. e falls below 0 C the water in a cooling tower can freeze Marley Technical Report FH 00S 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 Indoor Storage Tank With this type of system water flows from an indoor tank through the load system and back to the tower where it is cooled The cooled water flows by gravity from the tower to the tank located in a heated space At shutdown all exposed water drains into the tank where it is sate from freezing The table lists typical drain down capacities for all NX tower models Although we do not produce tanks many of our representatives offer tanks supplied by reputable manufacturers The amount of water needed to successtully operate the system depends on the tower size and flow and on the volume of water contained in the piping system to and from the tower You must select a tank large enough to contain those combined volumes plus a level sufficient to maintain a flooded suction on your pump Control makeup water according to the level where the tank stabilizes during operation NX Drain Down Capacity Range of Tower Model Design m hr
15. et Connection BOTTOM OF COLLECTION BASIN FLOOR TOP OF SUMP SUPPORT CJ EM Model T NX1010 SE 5 NX1015 T NX1020 K V NX1025 SUMP OUTLET SEE TABLE FOR SIZE DEPRESSED SIDE OUTLET SUMP CONNECTION Maximum Flow Per Outlet Diameter m hr Outlet Type NX1010 NX1015 pump flow w anti vortex plate NX1020 NX1025 Sump NOTE e Flow rate may be limited by the maximum flow for unit size Dimensions mm 483 463 503 483 Marley NX Fiberglass Cooling Tower Support L OVERALL OF BASIN Z 5 lt m H 500 x 500 x 12 QO B CAST IN PLACE STEEL PLATE a gt 570 C a lt o Lui gt gt 550 TOWER COLLECTION i BASIN ma NE vewe 150 D 7 150 CONCRETE PIER SUPPORT SINGLE CELL Operating Moge c Weight Cell kg NOTE 1 Use this bulletin for preliminary layouts only Obtain current 4 Design operating weight occurs with collection basin full to overflow drawings from your Marley sales representative for final design level Actual operating weight varies with flow and piping scheme 2 Piers should be level Adequate clearance for piping and 5 Obtain current drawings from your Marley sales representative for maintenance must be provided final dimensions 3 See page 21 for optional steel foundation piers Marley NX Fiberglass Cooling Tower Freeze Prevention When the ambient air temperatur
16. formed PVC with louvers and eliminators formed as part of each fill sheet Fill shall be sus pended from hot dip galvanized structural tubing supported from the tower struc ture and shall be elevated above the floor of the cold water basin to facilitate clean ing Air inlet faces of the tower shall be free of water splash out Drift eliminators formed as part of each fill sheet shall be PVC triple pass and shall limit drift losses to 0 005 or less of the design water flow rate LOUVERS 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 and waste water If you plan to use your tower in the wintertime particularly for free cool ing integral louvers will put your operating concerns to rest Integral louvers offer the best available technology for winter operation and water conservation E Drift rate varies with design water loading and air rate as well as drift eliminator depth and number of directional changes A drift rate of 0 001 is readily available on many standard models If a lower rate is required please discuss with your Marley sales rep resentative Keep in mind e Drift for towers with three pass high effi ciency eliminators constitute a small per centage of water usage e Unlike thermal performance drift rates are
17. hey also minimize algae growth in the basin Add the following paragraph in the Hot Water Distribution System section Each Basin shall be equipped with remov able fiberglass covers capable of with standing the loads described in paragraph 4 1 Steel Foundation Piers E Eliminates the need for cast in place support piers See photo on adjacent page Add the following paragraph in the Cold Water Collection Basin section Welded hot dip galvanized support piers shall be provided to support the cooling tower to adequately clear the bottom out let sump SP SPX COOLING TECHNOLOGIES UNIT 505 BLOCK B PHILEO DAMANSARA 2 NO 15 JALAN 16 11 OFF JALAN DAMANSARA 46350 PETALING JAYA MALAYSIA 60 3 7947 7800 spxcooling asiapacinfo spx com L ENN TECH spxcooling com info lenntech com Tal 31 152 610 900 In the interest of technological progress all products are subject to design and or www lenntech com Fax 431 152 616 289 material change without notice 2011 SPX sea_NX TS 11B
18. meet the performance standards set forth in GB 7190 1 2008 Certification Standard for Water Cooling Towers The obligation under this warranty shall be limited to the repair or the replacement of detective materials E Your 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 cool ing tower selection that fits your space allotment and whose power usage is acceptable Limitations on physical size and total operating kilowatts avoid the introduction of unforeseen operational and site related influences Specifying the number of cells and the maximum fan kW cell will work to your advantage The benefit of crossflow towers Is that they are inherently easy to operate access and maintain Compared to counterflow towers crossflow towers have a spacious plenum between banks of fill for easy access to all of the tower s inter nal components plus the water distribution system is adjacent to the fan deck and can be maintained during operation I The minimum efficiency per ASHRAE Standard 90 1 for induced draft open cooling towers applied to comfort cooling is 8 68 m hr per kW 35 29 5 23 9 There are no efficiency requirements for non comfort cooling applications If you want greater efficiency you can require it by specifying a higher ASHRAE Standard 90 1 m hr per kW
19. ndividually adjust able Maximum fan tip speed shall be 66m s Fan s shall be driven through V type belts pulleys and fan shaft with tapered roller bearings with a minimum service factor of 1 0 based on full motor kW Motor s shall be kW maximum TEAO 1 0 service and specially insulated for cooling tower duty Speed and electri cal characteristics shall be RPM single winding ____ phase __ hertz volts Motor shall operate in the shaft horizontal position and nameplate kW shall not be exceeded at design operation The complete mechanical equipment assembly for each cell shall be supported by a rigid steel structural support that resists misalignment between the motor and sheaves The mechanical equipment assembly shall be warranted against any failure caused by defects in materials and workmanship for no less than twelve 18 months following the date of tower shipment This warranty is limited to the fan fan shaft bearings sheaves and the mechanical equipment support The elec tric motor motor components and belt s are warranted by their manufacturer E Propeller type fans require only half the operating kW of blower type fans However they should be readily adjustable to permit compensation for jobsite conditions IS SS FS pm 4 Marley NX Fiberglass Cooling Tower Specifications Base Specifications Specification Value Fill Louvers and Drift Eliminators Fill shall be film type thermo
20. of fiberglass and heavy gauge steel protected against corrosion by hot dip galvanizing The tower shall be capa ble of withstanding water having a pH of 6 5 to 8 0 a chloride content NaCl up to 300 mg L a sulfate content SO4 up to 250 mg L a calcium content CaCO3 up to 500 mg L silica SiO2 up to 150 mg L and design hot water tempera tures up to 52 C The circulating water shall contain no oil grease fatty acids or organic solvents 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 requirements Where component materi als peculiar to individual tower designs are not specified the manufacturers shall take the above water quality and load carrying capabilities into account in the selection of their materials of manufac ture E It is important to understand the distinction between structure and anchorage Specifying that only the anchorage meet these requirements means the tower can become non functional even fall down yet remain attached to the founda tion Specifying structure will require the tower to remain operational The indicated design values are the minimums allowed under accepted design standards They give you assurance that the tower can be operated in a normal cooling tower environment Most NX models will withst
21. onflicting requirements The most common is for a cooling tower that provides the required heat rejection capacity with a high level of reliability at low cost Sound control while important is not the primary consideration for this application The other requirement which is becoming ever more important in our crowded fast paced society is driven by conditions that demand the lowest practical sound level Energy efficiency reliability and ease of maintenance while still extremely important are not the highest priorities In the first case sound is important while in the second case it is extremely important To best satisty these two competing market requirements we created choices through key mechanical equipment selections to control sound The result is a line of towers capable of meeting all but the most restrictive noise limitations and that 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 NX cooling towers are equipped with low sound fans This in combination with zero splash crosstlow film fill results in a line of towers capable of meeting most noise limitations Enclosures Occasionally cooling towers are located inside architectural enclosures for aesthetic reasons Although NX towers adapt well to enclosu
22. res 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 Marley Technical Report H 004 External Influences on Cooling Tower Performance is available at spxcooling com or from your Marley sales representative Marley NX Fiberglass Cooling Tower Water Quality System Cleanliness Cooling towers are very effective air washers Atmospheric dust able to pass through the relatively small louver openings will enter the circulating water system Increased concentrations can intensity 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
23. rial quality components The specifications portion of this publication not only relates the language to use in describing an appropriate NX Fiberglass cooling tower but also defines why certain items and features are important enough to specify and to insist upon compliance by all bidders The left hand column of pages 13 thru 21 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 13 thru 18 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 persons who are responsible for the operation of the system It will also incorporate those standard materials which testing and experience has proven to provide acceptable longevity in normal operating conditions Pages 19 thru 21 provide paragraphs intended to add those features components and materials that will customize the cooling tower to meet the user s requirements Marley NX Fiberglass Cooling Tower Sound Control The NX Quiet by Design The NX is the result of extensive design studies focused on cooling tower sound control These studies were complicated by the fact that the cooling tower market is typically driven by one of two powerful yet often c
24. roblem Marley ladder extensions are available in standard 1 5m and 3 3m lengths E To meet ISO guidelines towers whose fan decks are 6m or more above roof or grade and which are equipped with ladders should have safety cages sur rounding the ladders but with approximately 2m clear headroom i No No Marley NX Fiberglass Cooling Tower Specifications Options Specifications Specification Value Access Door Ladder Add the following paragraph in the Access section A 38cm wide HDG ladder shall be permanently attached from the access door to the base of the tower Ladder Safety Gate Add the following paragraph in the Access section A welded galvanized steel self closing gate shall be provided at the guardrail level of the ladder Miscellaneous Options Sound Control Add the following paragraph under Base The cooling tower shall be quiet operation and shall produce an overall level of sound not higher than dB A measured at m from the locations in the table below Location Discharge Air Inlet Cased Face Location Discharge Air Inlet Cased Face 20 E A galvanized self closing gate located at the guardrail level of the fan deck E Sound produced by a standard NX Cooling Tower operating in an unob structed environment will meet all but the most restrictive noise limitations and will react favorably to natural attenuation Where the cooling tower has been sized to operate within an en
25. ssflow type towers result ing in operating pump heads of 3 to 6 meters less than that encountered in counterflow towers with pressurized spray systems Also these basins are located where they can be easily inspected even maintained while the tower is in operation Some manufacturers require shutting down the tower to clean the distribution system Can you afford to do that q 4 a 4 o D i E The access doors are 70cm wide by 115cm high Small access doors are pro hibitive and discourage maintenance which in turn can impact your operation Specifying the size of the door will cause some bidders to take exception alert ing you to a potential maintenance headache H i Marley NX Fiberglass Cooling Tower Specifications Base Specifications Specification Value Cold Water Collection Basin The collection basin shall be fiberglass supported by a hot dip galvanized struc ture and shall include the number and type of outlet connections required to accommodate the out flow piping system shown on the plans Outlet connections shall be equipped with debris screens A factory installed float operated mechani cal make up valve shall be included Additionally a quick fill makeup connec tion shall also be supplied to initially fill the tower An overflow and drain connec tion shall be provided in each cell of the cooling tower The basin floor shall slope
26. various designs and capacities to meet the special demands of specitic applications spxcooling com visit us on the web for a complete list of products services publications and to find your nearest sales representative Marley NX Fiberglass Cooling Tower Schematic 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 NX model recommendations based on customer s specific design requirements INSTALLED HEIGHT EL AS as HINGED ACCESS DOOR SIDE ELEVATION AIR INLET ELEVATION NOTE Model note 2 NX1010K 1 NX1010M 1 NX1010N 1 NX1010P 1 NX1015K 1 NX1015M 1 NX1015N 1 NX1015P 1 NX1020N1 NX1020P 1 NX10200Q 1 NX1025N 1 NX1025P 1 NX10250 1 Nominal Capacity tons note 3 Motor nameplate 4 5 5 7 5 1 Use this bulletin for preliminary layouts only Obtain current drawings from your Marley sales representative All table data is per cell 2 Last numeral of model number indicates number of cells Change as appropriate for your selection Nominal cooling capacity based upon 35 C HW 29 5 C CW 25 5 C WB and 68 m hr per ton
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