Tech NC 00
Contents
1. TOWER CELL N Ne 6 FACE OF 10 DIA SIDE INLET CONNECTION SINGLE SIDE SIDE INLET TOWER INLET NOTE 5 16 13 16 GNLET TOWER FACE OF 10 DIA BOTTOM INLET CONNECTION SINGLE BOTTOM INLET NOTE 5 DIMENSIONS D 2 5 3 10 16 2 5 4 4 18 2 4 2 4 1 Allow adequate clearance for entry to tower access doors and safe use of optional ladder Refer to appropriate Marley drawings You may choose either 8 bottom inlet connection or 8 side inlet connection The bottom inlet connects at the tower collection basin floor Refer to appropriate Marley drawings Contact your Marley sales representative for the required pump head for single inlet applications Weight of internal piping must be added to tower weights Contact your Marley sales representative for combined tower weight information 15 INLET TOP OF Jed SUPPORT 10 D SINGLE BOTTOM NLET NOTE 5 Tower Model 6 5 3 55 5 9 55 6 9 5 5 NC8200 NC9200 NCC200 NOTE 1 Use this bulletin for preliminary layouts only Obtain current 4 drawings from your Marley sales representative 2 All external piping loads including weight thrust and late2. TOWER COLLECTION SEE TABLE FOR SIZE REMOVABLE BOTTOM OF ia SCREEN TRASH SCREEN BOTTOM OF BASIN FLOOR 15 2 SECTION f NOTE BOTTOM OUTLET 5 ALSO AVAILABLE WITHOUT TOP OF SUPPORT eae BASIN FLOOR REMOVABLE TRASH SCREEN BOTTOM OUTLET CONNECTION 17 Bottom Outlet pump flow w anti vortex plate or gravity flow w or w o anti vortex plate NC7 thru NC9 NCB NCC NC1 thru NC6 NCA 157 355 629 992 Bottom Outlet pump flow w o anti vortex plate Sump pump flow w anti vortex plate or gravity flow w or w o anti vortex plate NC7 thru NC9 NCB NCC NC1 thru NC6 NCA 900 1 595 2 515 TOWER CELL 2 4 9 8 MIN CLEARANCE SECTION COLLECTION TOP OF BASIN FLOOR SUPPORT sump 1 MEL 1 8 3 8 2 7 5 8 1 1 7 2 SUMP OUTLET Ed SEE TABLE FO
3. 12 k Ww 2 L A K MARLEY HC 6 BALANCING VALVE OPTION NOTE 6 2 TOWER FACE OF VALVE L9 INLET FLANGE REDDES 2 INCLUDES ug HEADER Va GASKET Zn TOP OF DISTRIBUTION BASIN 18 3 9he S INLET USE FOR ELEVATION STATIC LIFT SINGLE CELL MULTICELL DIMENSIONS Tower Model Inlet Diameter K s N Q gt NC8200 20 6 19 0 1346 6 1 117 2 va 9 11 2 at 8 NC9200 thru NC9250 20 6 19 0 1346 6 1 12 2 va 9 11 1 2 2 at 8 NC9260 20 6 19 0 1346 6 1 12 9 9 11 4 2 at 8 NCC200 20 3 2 19 2 6 6 10 55 14 2 99 7 2 at 10 NOTE 1 Use this bulletin for preliminary layouts only Obtain current 4 All piping and supports and their design are by others drawings from your Marley sales representative 5 Allow adequate clearance for entry to tower access doors and 2 Pumping head contributed by the tower is static lift Add your safe use of optional ladder Refer to appropriate Marley drawings system dynamic pipe losses for total 6 You may choose to use 90 short radius flanged elbows in place 3 The tower will support the vertical wei
4. often eliminating the need to specify an outlet and makeup valve for each cell on multicell installation Select the number of outlets required to maintain 3 maximum flow of 1 371 GPM through each flume for NC1 through NC6 and NCA models and 2 203 GPM for NC7 through NC9 and NCB through NCC models Flow values are for side suctions or bottom outlets without trash screen Refer to NC sales drawings to obtain flow values for sumps and bottom outlets with trash screens SYSTEM CONNECT Tired of having to design your piping and tower layout to accommodate the standards of cooling tower manufactur ers Marley s SystemConnect variety of piping systems accommodates your design intentions to make your layout of the NC Series both expedient and economical gt Single or dual hot water inlet connections Side inlet bottom inlet or top inlet connections 2 Side or bottom cold water outlet connections gt A variety of makeup overflow and drain options All piping from the single inlet connection to the distribu tion basins is part of the tower package Installation and design costs are reduced and the need for extra piping and supports are eliminated The single bottom inlet connection is perfect for multicell applications keeping all the inlet piping below the tower Unless otherwise specified single cell towers normally have a side outlet suction appropriate for the design water flow rate see pages 16 and 17
5. 1320 1330 1910 1920 3120 480 690 700 1040 1050 1440 1450 2090 2100 3410 480 1040 1050 1640 1650 2090 2100 2730 2740 3620 480 1220 1230 1930 1940 2460 1270 3210 3220 4100 480 810 820 1220 1230 1690 1700 2460 2470 4100 NC Series Drain Down Capacity Tower Model Maximum Gallons of Drain Down 391 413 436 458 476 488 512 531 578 601 585 546 570 627 656 622 655 683 755 791 928 977 1029 1146 1208 1019 1115 1189 1258 1325 Tower Model Range of Tower Design GPM 130 280 290 480 490 700 710 920 930 1200 160 340 350 500 510 680 690 1140 1150 1530 160 340 350 500 510 680 690 1140 1150 1530 190 390 400 570 580 770 780 1290 1300 1730 310 650 660 940 950 1280 1290 2140 2150 2810 340 710 720 1240 1250 1790 1800 2340 2350 3080 NOTE Volumes shown are maximums for the GPM ranges indicated Actual volumes will usually be less Contact your Marley sales representa tive for more specific information OPERATING AND ENVIRONMENTAL AWARENESS As suggested in 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 Ma
6. 50 psig use pressure reducer ahead of valve For flow requirements exceeding the above limitations use multiples of the same size valve 11 SYSTEM CONNECT DUAL INLET CONNECTION TOWER NLET 2 hoe K 0 HO SYS MARLEY HC BALANCING VALVE 4 OPTION NOTE 6 to TOWER FACE OF VALVE INLET FLANGE P INCLUDES 88 INCLUDES MIN MAX HEADER TOP OF i V GASKET Ja BETREUTEN 1 4 GASKET 5 BASIN J USE FOR INLET STATIC LIFT ELEVATION SINGLE CELL MULTICELL DIMENSIONS Tower Model Inlet Diameter J K 5 N MIN MAX P Q NC1200 8 8 1146 12 3 6 4 1546 3 11 4 10 5 10 6 8 14 2816 NC2200 8 8 1146 13 97 9 4 1546 5 10 4 Fit P 6 7 8 27 2 at 6 NC3200 10 5 5 6 13 9 11 1 1346 5 10 4 Fit P 6 7 8 27 2 at 6 NC4200 117 5 6 15 3 12 1 136 5 10 vr Fit P 7 4 9 2 Ya 2 at 6 NC5200 11 5 6 16 10 12 2 1346 5 11 W RITAR 6 12 11 21 2 at 8 NC6200 115 6 17 11 12 2 136 6 15 Fit P 6 6 12 2 va 2 at 8 NC7200 119 6 20 6 12 6 16 6 15 9 11 12 2 va 2 at 8 NCA200 11 5 6 20 6 12 2 1346 6 10 Fit P 9 11 14 2 va 2 at 8 NCB200 11 9 6 20 3 2 12 8 136 6 10 5 9 9 Ve 14 2 VA 2 at 10
7. P74 6833mm 3626mm 4058mm 3715mm 26 520 11 462 NC7231 619 26 586 11 528 NC7241 632 26 858 11 800 NCA2A1 530 27 314 12 048 22 5 13 10 34 12 11 1 2 NORE 568 6833mm 4236mm 3956mm 4325mm 27 376 12 110 NCA2C1 12 463 11 945 12 007 619 27 729 NCA201 556 27 211 12 150 13 063 22 5 13 10 12 11 94 14 24 NGARTI 591 6833mm 4236mm 3956mm 4325mm 27 273 NCA221 13 125 13 478 651 27 416 NCB2A1 559 30 659 NCB2B1 30 721 NCB2C1 31 074 NCB2D1 677 31 140 13 544 NCB201 586 30 556 12 960 NCB211 13 022 13 165 13 584 13 856 11 24 3410mm 12 11 34 3956mm 10 10 34 3321mm 597 22 5 15 10 646 6833mm 4236mm 14 2 1 4 4325 13 35 4058 620 30 618 22 5 13 10 13 3 14 2 NGE221 676 6833mm 4236mm 4058mm 4325mm 30 761 NCB231 710 31 180 NCB241 750 31 452 NOTE 1 Use this bulletin for preliminary layouts only Obtain current 4 Standard overflow is a 4 dia standpipe in the collection basin floor The standpipe removes for flush out and draining See page 16 for side overflow option 2 Last numeral of model number indicates number of cells Change Outlet sizes vary according to GPM and arrangement See pages as appropriate for your selection 16
8. This usually assures the lowest possible installed tower elevation Side suction con nection pipes extend roughly 3 outside the basin and are beveled for weld connection and also grooved for a me chanical coupling Outlet piping can be kept below the cold water basin level by choosing either a depressed sump or a bottom outlet connection in lieu of the side suction Both outlet designs conform to standard class 125 ANSI pipe flange specifications Easily removable debris screens are op tional on bottom outlets and are standard on all other outlet arrangements Depressed sumps are made of inert FRP or heavy gauge welded stainless steel Unless otherwise specified towers with galvanized steel collection basins are supplied with FRP sumps and towers with stainless steel basins are supplied with stainless sumps 10 If each cell is to be equipped with an outlet side suctions Makeup Water Flow Required GPM can be used on end cells of multicell towers but not on to Maintain Three 3 Concentrations interior cells For direct outlet from each cell on installations Cooling Range hot water minus cold water of three or more cells use either the depressed sump or 10 F 15 F bottom outlet on interior cells 3 4 5 8 The best choice for a tower used with a remote or indoor 2 5 storage tank see page 20 on 8 concrete cold water basin is usually 8 bottom outlet 10 15 13 19 side suction equ
9. and 17 for outlet sizes and details 3 Nominal tons are based upon 95 F HW 85 F CW 78 F WB and Makeup water connection may be 1 or 2 dia depending upon tower heat load water pressure and desired connections See page 11 for additional information drawings from your Marley sales representative All table data is per cell 3 GPM ton TOWER SCHEMATIC SN piii Enn KY SIT 6 LT RAY H INSTALLED HEIGHT HINGED ACCESS DOOR Design Operating Wt Cell Ib Weight Cell Shipping Weight Ib Heaviest Section 33 014 15 337 8 338 33 076 15 399 8 400 33 219 15 542 8 543 33 285 15 608 8 609 33 557 15 880 8 881 35 689 16 335 8 838 35 751 16 397 8 900 35 815 16 461 8 964 35 881 16 527 9 030 36 153 16 799 9 302 36 292 16 938 9 441 36 372 17 018 9 521 41 545 18 905 9 997 41 607 18 967 10 059 41 751 19 110 10 202 41 817 19 176 10 268 42 299 19 658 10 750 42 354 19 718 10 810 42 451 19 810 10 902 4 Standard overflow is a 4 dia standpipe in the collection basin floor The standpipe removes for flush out and draining See page 16 for side overflow option Outlet sizes vary according to GPM and arrangement See pag
10. of 4 F or more temperature approaches of 5 F or more and wet bulb temperatures between 60 F and 85 F Indicates maximum hydraulic limit TOWER MODEL SELECTION GPM Cooling capability at indicated Hot Water Cold Water and Wet Bulb temperatures NC1201 NC1211 NC1221 NC2201 NC2211 NC2221 NC3201 NC3211 NC3221 NC4201 NC4211 NC4221 NC5201 NC5211 NC5221 NC5231 NC6201 NC6211 NC6221 NC7201 NC7211 NC7221 NC7231 NC7241 NCA2A1 NCA2B1 NCA2C1 NCA201 NCA211 NCA221 NCB2A1 NCB2B1 NCB2C1 NCB2D1 NCB201 NCB211 NCB221 NCB231 NCB241 GPM cooling capability at indicated Hot Water Cold Water and Wet Bulb temperatures NC8201 NC8211 NC8221 NC8231 NC8241 NC9201 NC9211 NC9221 NC9231 NC9241 NC9251 NC9261 NCC201 NCC211 NCC221 NCC231 NCC241 NCC251 NCC261 9 Thermal performance of the NC Series has been certified by CTI Cooling Tower Institute in accordance with CTI Standard STD 201 96 and has been assigned CTI certification validation number 92 14 01 e CTI Certification under STD 201 96 applies ONLY to selections with entering water temperature of 125 F or less tempera ture ranges of 4 F or more temperature approaches of 5 F or more and wet bulb temperatures between 60 F and 85 F Indicates maximum hydraulic limit EXCEPT FOR MODEL NC122
11. 0 DIMENSION Ay REPEATS FOR ANY NUMBER OF CELLS MODEL NC1220 REQUIRES SPECIAL SPACING FOR 3 OR MORE CELLS f AMN ne MOTOR ENCLOSURE PROTRUSION MODEL NC1220 ONLY H INSTALLED HEIGHT TOWER SCHEMATIC 4 Ry KAYA KITTS SS NIS ID HINGED ACCESS DOOR xh NS AY ay nee Design Operating DIMENSIONS Shipping Tower Model Nominal Tons Weight Note 2 Note 3 Wt Cell W H A lb NC1201 135 9 129 4 541 140 6 45 10 15 6 8 Ya 153 4268mm 1950mm 3090mm 2039mm 25180 NC1221 167 9 298 4 709 NC2201 182 11 589 5 332 156 7 10 10 2 8 2 V4 Nesai 203 4725mm 2407mm 3109mm 2496mm 11 615 5 358 NC2221 228 11 699 5 442 NC3201 226 12 021 5 764 15 6 7 10 11 8 2 w NESEN 259 4725mm 2407mm 3638mm 2496mm 12 104 5 848 NC3221 281 12 165 5 909 NC4201 311 14 615 6 940 170 8 10 94 12 11 9 2 V4 NC4211 339 5182mm 2712mm 3956mm 2801mm 14 692 LOV NC4221 363 14 749 7 074 NC5201 403 19 275 8 980 NC5211 432 ie 19 353 9 059 NC5221 450 5715mm 19 415 9 121 NC5231 501 19 681 9 387 NC6201 475 21 834 10 021 19 10 11 105 12 11 94 12 2 WW NC6211 503 6046mm 3626mm 3956mm 3715mm 21 896 10 083 NC6221 548 22 039 10 226 NC7201 501 26 315 11 257 NC7211 529 26 377 11 319 22 5 11 10 13 3 12 2 Wa ee
12. 76mm 117 8 34 3576mm 10 8 34 3271mm 117 8 34 3576mm 117 8 34 3576mm 13 8 5 4185mm 13 8 7 4185mm 13 8 34 4185mm 13 8 5 4185mm 6 45 1950mm 7 10 2407mm 7 10 2407mm 8 10 52 2712mm 10 10 34 3321mm 11 10 34 3626mm 11 10 34 3626mm 10 10 34 3321mm 11 10 34 3626mm 11 10 34 3626mm 13 10 34 4236mm 13 10 34 4236mm 13 10 34 4236mm 13 10 34 4236mm 14 0 4268mm 15 6 4725mm 15 6 4725mm 17 0 5182mm 18 9 5715mm 19 10 6046mm 225 6833mm 225 6833 225 6833mm 2257 6833mm 225 6833mm 225 6833mm 225 6833mm 2257 6833 2 1 4 2 2 u O T 3 gt C 1 2 O gt 2 1 4 Tower Model NC1200 NC2200 NC3200 NC4200 NC5200 NC6200 NC7200 NC8200 NC9200 thru NC9250 NC9260 NCA200 NCB200 NCC200 thru NCC250 NCC260 18 OVERALL LENGTH OF BASIN 7 1 E ANCHOR ANCHOR ANCHOR ANCHOR BOLT BOLT BOLT BOLT ANCHOR BOLT HOLES FOR 5 8 DIA ANCHOR BOLTS 4 CELL W OVERALL WIDTH OF BASIN BASIN SUPPORTING STEEL MULTICELL MINIMUM BEARING WIDTH MUST BE PROVIDED BY BEAM FLANGE OR BEARING TOWER PLATE AT EACH ANCHOR BOLT LOCATION TOWER COLLECTION COLLECTIO
13. 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 NC Series or a competitive tower of similar manufacture PVC is subject to distortion in high water temperatures and the narrow passages 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 gt Water temperatures exceeding 125 F adversely affect the service life and performance of normal PVC fill o gt Ethylene glycol content can plug fill passages as slime and algae accumulate to feed on the available organic materials o Fatty acid content found in processes such as soap and detergent manufacturing and some food pro cessing fatty acids pose a serious threat for plugging fill passages gt 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 o 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 The Marley Cooling Tower Company 7401 W 129 Street Overland Park KS 66213 0 email info marleyct com ww
14. Marley Cooling Tower 360 ton Mfg Marley Model NC4011GM Stock No 130 CJR1802 40 Serial No 060597 001 94 Marley Cooling Tower 360 ton Model NC4011GM S N 060597 001 94 Designed to cool 1080 gpm from 95 2 to 85 2 at a 78 Similar to current NC4211 Model Marley Technical Reference TOWER MODEL SELECTION GPM Cooling capability at indicated Hot Water Cold Water and Wet Bulb temperatures NC1201 NC1211 NC1221 NC2201 NC2211 NC2221 NC3201 NC3211 NC3221 NC4201 NC4211 NC4221 NC5201 NC5211 NC5221 NC5231 NC6201 NC6211 NC6221 NC7201 NC7211 NC7221 NC7231 NC7241 NCA2A1 NCA2B1 NCA2C1 NCA201 NCA211 NCA221 NCB2A1 NCB2B1 NCB2C1 NCB2D1 NCB201 NCB211 NCB221 NCB231 NCB241 GPM cooling capability at indicated Hot Water Cold Water and Wet Bulb temperatures NC8201 NC8211 NC8221 NC8231 NC8241 NC9201 NC9211 NC9221 NC9231 NC9241 NC9251 NC9261 NCC201 NCC211 NCC221 NCC231 NCC241 NCC251 NCC261 9 Thermal performance of the NC Series has been certified by CTI Cooling Tower Institute in accordance with CTI Standard STD 201 96 and has been assigned CTI certification validation number 92 14 01 e CTI Certification under STD 201 96 applies ONLY to selections with entering water temperature of 125 F or less tempera ture ranges
15. N BASIN 6 BASIN 5 8 WASHER REQD BY OTHERS SUPPORT SUPPORT 5 8 WASHER REQD BY OTHERS d BY OTHERS BY OTHERS NORMAL 18 Ye EDGE NORMAL L GAUGE VIEW A SECTION B NOTE 1 Use this bulletin for preliminary layouts only Obtain current 5 Tower may be placed on a flat concrete slab Side outlet and drawings from your Marley sales representative for final design optional side drain and overflow must be specified See pages 10 2 Purchaser to provide tower support complete with holes and and 16 and consult your Marley application engineer anchor bolts Do not use studs Anchor points must be framed 6 Tower may be supported from piers at each anchor bolt location flush and level at top i as a support alternative 3 Design operating weight occurs with collection basin full to 7 Dimensions between cells may vary depending on the overflow level Actual operating weight varies with GPM and number of cells and options Dimensions shown are for a piping scheme but is less than shown here standard two cell arrangement Obtain current drawings from your 4 Wind loads are based on 30 psf and are additive to operating Marley sales representative for final dimension loads Seismic loads based on 1994 UBC Zone 4 19 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 tow
16. R SIZE DEPRESSED SIDE OUTLET SUMP CONNECTION STAINLESS STEEL OR FRP Maximum GPM per Outlet Sump pump flow w o anti vortex plate Side Suction pump flow 900 1 595 2 515 2 720 NC1 thru NC4 3 501 NC5 NC6 NCA Outlet Dia NOTE For gravity flow situations as to an indoor tank use bottom outlet or depressed side outlet sump Side outlet suction is not recommended for gravity flow GPM limits are the outlet capacities per outlet based on the design operating water level 812 above the top of support on models NC1 through NC6 and NCA 9 on NC7 through NC9 and NCB and NCC OUTLET 1 L OVERALL OF BASIN 4 1 ANCHOR ANCHOR BOLT BOLT HOLES FOR 5 8 DIA ANCHOR BOLTS 4 REQD TOWER COLLECTION BASIN N N N ANCHOR BOLT ANCHOR BOLT W OVERALL WIDTH OF BASIN 2 1 4 SUPPORTING STEEL ALTERNATE SINGLE CELL Wind Seismic Loads Ib Max Horizontal Reaction at Anchor 943 794 Design Operating Load at Anchor Ib Max Vert
17. ded in the side of the collection basin gt 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 When purchased in conjunction with the Marley Control System option they are factory installed and tested 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 Steam Jet Basin Heaters Penberthy Houdaille bronze steam jet heaters to 34 are available from Marley for freeze protection instal lation by others Injectors install in a coupling provided in the side of the collection basin Live steam as required is injected directly into the water Condensed steam adds water to the basin and the excess will exit the overflow of the tower 20 2 Maximum Gallons of Drain Down 1256 1415 1508 1589 1656 1394 1507 1607 1746 1974 1526 1649 1755 1909 2156 1231 1318 1384 1463 1557 1575 1683 1762 1855 1962 1773 1917 2042 2226 2549 Range of Tower Design GPM 480 830 840 1440 1450 2090 2100 2730 2740 3410 350 630 640 950 960
18. eep You can usually resolve these situations by using two speed motors in either 1800 900 or 1800 1200 RPM configuration operat ing the fans at reduced speed without cycling after hours The natural nighttime reduction in wet bulb temperature makes this a very feasible solution in most areas of the world but the need to avoid cycling may cause the cold water temperature to vary signif icantly gt The Marley Variable Speed Drive automatically min imize 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 inexpen sive solution and can pay for itself quickly in reduced energy costs S Where noise is a concern at all times for example near a hospital the best solution is to oversize the tower so itcan operate continuously at reduced 1200 or 900 RPM motor speed Typical sound reductions are 7 dBA at 2 3 fan speed or 10 dBA at 1 2 fan speed Extremecases may require inlet and discharge sound attenuator sections however the static pressure loss imposed by attenuators may necessitate an increase in tower size This is the least desirable approach because of the significant cost impact and because ofthe obstruction to normal maintenance procedures Your Marley sales representative will help you meet your sound requirements Enclosures Occasionally cooling towers are
19. er to the tank located in 8 heated space At shutdown all exposed water drains into the tank where it is safe from freezing The table on page 21 lists typical drain down capacities for all NC Series tower models Although Marley does not produce tanks many of our representatives offer tanks supplied by reputable manufacturers The amount of water needed to successfully operate the system depends on the tower size and GPM and on the volume of water contained in the piping system to and from the tower You must select tank large enough to contain those combined volumes plus a level sufficient to main tain a flooded suction on your pump Control makeup water according to the level where the tank stabilizes during operation FREEZE PREVENTION When the ambient air temperature falls below 32 F the water in 8 cooling tower can freeze Marley Technical Report H 003 Operating Cooling Towers in Freezing Weather describes how to prevent freezing during opera tion 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 Marley offers an automatic basin water heater system consisting of the following components gt Stainless steel electric immersion heater s Threaded couplings are provi
20. es 16 and 17 for outlet sizes and details Makeup water connection may be 1 or 2 dia depending upon tower heat load water pressure and desired connections See page 11 for additional information DIMENSIONS Tower Model Nominal Tons Note 2 Note 3 NC8201 NC8211 117 2 4 3410mm 19 95 6039mm 10 10 34 NESEN 3321mm NC8231 NC8241 NC9201 NC9211 NC9221 12 2 3715mm 19 95 6039mm 11 10 34 3626mm NC9231 NC9241 NC9251 23 47 12 92 7112mm 3899mm 12 8 NC9261 3877mm NCC201 NCC211 NCC221 14 2 va 4325mm 19 9 34 6039mm 13 10 4236mm NCC231 NCC241 NCC251 23 4 14 2 Va 7112mm 4325mm 13 10 34 NCC261 4236mm NOTE Use this bulletin for preliminary layouts only Obtain current drawings from your Marley sales representative All table data is per cell Last numeral of model number indicates number of cells Change as appropriate for your selection Nominal tons are based upon 95 F HW 85 F CW 78 F WB and 3 GPM ton 1 Multicell towers intended to operate together as 8 common unit are joined by steel flumes between the collection basins These flumes equalize the operating water level between basins and also provide a flow pas sage from cells not equipped with outlets or makeup valves
21. ght of piping shown within of HC balancing valves on single cell towers where inlet piping is the plan area of the tower only All piping loads including thrust balanced for equal flow Pipe elevation remains as shown and lateral loads of riser and horizontal piping must be supported 7 Because of the motor enclosure protrusion model NC1220 independent of the tower See inlet piping drawings for details requires special spacing for 3 or more cells 13 SYSTEM CONNECT SINGLE INLET CONNECTION OPTION 1 0 O Ww 3 Q TI FACE OF SIDE INLET CONNECTION SINGLE SIDE INLET NOTE 5 INLET GINLET GTOWER SINGLE BOTTOM Topor FACE OF INLET NOTE 5 SUPPORT BOTTOM INLET D CONNECTION Eo SINGLE BOTTOM INLET NOTE 5 DIMENSIONS Inlet Tower Model E Diameter NC1200 6 8 Va 5 0 55 2 6 1 11 1346 NC2200 6 6 1546 5 9 546 2 6 2 5 Ve NC3200 6 3 1346 5 9 546 2 6 2 5 Ve NC4200 9 3 1346 4 3 Ve 2 10 2 11 5 6 NC5200 9 3 5 5 5 3 55 2 6 6 1 4 18 NC6200 9 3 55 5 9 Ve 2 6 2 9 NC7200 9 7 5 5 5 9 6 2 6 26 2 95 NCA200 9 3 5 5 6 9 5 5 2 4 3 7 We NCB200 9 7 5 5 6 9 Ve 2 4 1 2 Ae 14
22. ical Reaction at Anchor 2 324 1 364 1 212 2 925 1221 1 225 1 046 1002 3 041 1 737 1578 1 248 1 042 3 687 2 019 1 789 1 498 1 263 4 920 1 803 2 108 1 648 1 686 5 510 1 759 2 106 1 750 1 689 6 714 2 090 2 518 2 029 2 301 8 369 5 405 5 554 3 121 2 875 9 073 4 958 5 484 3 126 3 110 9 093 5 779 5 498 3 353 3 117 1 982 2 154 6 933 1 704 2 062 7 863 1 801 2 465 2 037 2 697 10 589 4 248 5 420 3 131 3 636 10 613 4 971 5 434 3 364 3 644 Design Operating Wt Cell Ib 9 298 11 699 12 165 14 749 19 681 22 039 26 858 33 557 36 292 36 372 27 729 31 452 42 354 42 451 E Note 7 51 27 140mm 51 27 140mm 5 140mm 5 140mm 5 140mm 5 140mm 5 140mm 5 140mm 5 140mm 1 0 34 324mm 51 57 140 51 57 140 51 57 140mm 5 140mm TOWER SUPPORT L OVERALL OF BASIN ANCHOR ANCHOR BOLT BOLT HOLES FOR 5 8 DIA ANCHOR BOLTS 4 REQD TOWER COLLECTION BASIN ANCHOR BOLT ANCHOR BOLT SUPPORTING STEEL SINGLE CELL DIMENSIONS 6 13 7 vz 4153 157 1 4 4611 15 1 4 4611 16 7 Va 5068mm 16 4 12 5601mm 19 5 12 5931mm 22 0 6719mm 22 0 6719mm 22 0 6719mm 22 0 6719mm 22 0 2 6719mm 22 0 6719mm 22 0 6719mm 22 0 6719mm 6 2 1899mm 7T 8 2356mm 7T 8 2356mm 6 8 2661mm 10 8 34 3271mm 117 8 34 35
23. ipped tower can be installed flat 19 29 concrete slab if a side drain and overflow are also speci 25 38 fied see page 16 Consult your Marley sales engineer for 38 57 complete information 50 75 63 94 75 Makeup The amount of water constantly evaporated from a Norte cooling tower VANGS directly with the heat load applied In If circulating water is to be maintained at 2 concentrations instead of addition to evaporation water is normally lost to the blow 3 multiply table GPM values by 1 36 before sizing makeup valve down bleed off necessary to maintain dissolved solids concentration at an acceptable level in the circulating water system The NC is equipped with one or more float operated NET Valve FI iti mechanical makeup valves to automatically replenish this akeup Flow bapacities GRM lost water The tables on this page calculated for a concen Pressure at Valve Inlet 1 Diameter 2 Diameter tration of 3 times normal indicate the rate of water loss and while flowing psig Valve Valve the size of valve s required your installation s cold water 10 56 90 basin will drain by gravity to remote storage tank or if you plan 8 separate means of controlling makeup water s a price reduction is available for deleting the Marley supplied 30 92 valve s Marley also offers an optional electronic liquid level contol 50 NOTE If makeup water pressure exceeds
24. located inside archi tectural enclosures for aesthetic reasons Although NC 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 22 HOISTING INFORMATION 23 OFFSET MAY BE REQUIRED OFFSET MAY BE REQUIRED Minimum Sling Length ao ae oo oe 0 ey me T ee FOR BALANCED LI FOR BALANCED LIFT CENTER OF NC1 NC2 NC3 NC4 NC5 NC6 NC7 NCA NCB NC8 Top NC8 Bottom NC9 Top NC9 Bottom NCC Top NCC Bottom NOTE All hoisting clip holes are 1 e Overall length of shackle pins should not exceed 514 For overhead lifts or where additional safety is required add slings beneath the tower unit Alternative Selections In addition to the NC Series Marley offers a full scope of products in various designs and capacities to meet the special demands of specific applications Corrosion Resistance gt QuadraFlow fiberglass and stainless steel con struction assures long service life in virtually an
25. ommendations con sult a competent qualified water treatment supplier Most systems can be successfully treated with a MARLEYOZONE System This usually removes the requirement for other chemical feed systems In many installations there is the potential for significant water savings For complete information contact your local Marley sales representative A CAUTION The cooling tower must be located at such distance and direction to avoid the possibility of contaminated tower 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 tower is in compliance with applicable air pollution fire and clean air codes Sound Control Sound produced by a NC Series tower operating in an unobstructed environment will meet all but the most restric tive 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 damp ing effect on sound Sound also declines with distance by about 5 dBA each time the distance doubles Where noise at a critical point is likely to exceed an acceptable limit several options are available listed below in ascending order of cost impact gt In many cases noise concerns are limited to night time when ambient noise levels are lower and neighbors are trying to sl
26. ral loads of riser and horizontal piping plus the weight of water in the 5 internal riser must be supported independent of the tower Internal riser adds additional vertical operating loads to external piping at the bottom inlet flange 3 All piping and supports beyond the inlet connection and their design are by others SYSTEM CONNECT OUTLET CONNECTION DIMENSIONS SUCTION CONNECTION TOWER Tower Model SEE TABLE FOR SIZE 1 c NC1200 4 6 NC2200 4 5 6 OVERFLOW 3 DIA NPTF DRAIN AND CLEAN OUT 11 2 DIA NPTF NC3200 6 NC4200 4 7 6 6 NC5200 4 fe 4 6 4 6 9 NC6200 i 2 6 78 NC7200 0 5 10 346 12 7 8 8 TOP OF NC8200 10 55 SUPPORT NC9200 A 10 346 NCA200 2 6 DRAIN AND OVERFLOW CONNECTION NOB200 T ae OPTION NCC200 20 105 WELDING TOWER BEVEL MECHANICAL COUPLING GROOVE SUCTION HOOD REMOVABLE TRASH SCREEN SUCTION CONNECTION SEE TABLE FOR SIZE TOP OF 5 EFE TOWER CELL SECTON SIDE OUTLET SUCTION CONNECTION 16
27. rley sales representative System Cleanliness Cooling towers are very effective air washers Atmo spheric dust able to pass through the relatively small louver openings will enter the circulating water system Increased concentrations can intensify system maintenance by clog ging 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 de posits 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 In order to control the inevitable buildup of dissolved solids as water evaporates from the cooling tower you should plan to develop a consistent effective program of water treatment The program must control corrosion scale buildup and accumulation of biological contaminants An acceptable water treatment program must be com patible 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 Additional water quality requirements appear in the NC User Manual which accompanies the tower For complete water treatment rec
28. w marleyct com In the interest of technological progress all products are subject to design and or material change without notice 2000 Marley Cooling Tower TECH NC 00 Marley Cooling Tower A United Dominion Company Printed in USA
29. y environment Five year full product warranty Efficient PVC film fill Uniquely different and architecturally attrac tive Similar capacities to the NC Series gt Sigma Series available in wood fiberglass HDG steel or stainless steel structure Field erected for medi um to large projects Available in a wide range of sizes Efficient PVC film fill Splash Fill Towers Series 10 Series 15 wood structure fiberglass casing with splash type fill Similar capacities to Sigma series towers Proven in hundreds of installations Ex cellent in dirty water situations World Wide Web gt WWw marleyct com visit Marley on the web for a complete list of products services and to find your nearest sales representative ADDITIONAL INFORMATION Typical Applications The NC Series 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 NC Series can also used in the cooling of jacket water for engines and air compressors and are widely applied to dissipate waste heat in a variety of industrial and manufac turing processes Being constructed of stainless steel and other inert materials the NC Diamond Series can be confidently applied in unusually corrosive processes and operating environments
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