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The advanced composite full floating center sectionweighs less than 25% of a comparable steel spacer. Butdont be fooled by the lighter weight. Rexnord Addax
advanced composites are heavyweights when it comes toperformance, due to their rugged, corrosion-resistantdesign. With almost twice the critical speed of metals,and up to an 80% reduction in overhung bearing loads,Rexnord Addax composite couplings reduce vibrationand extend bearing life. Installation is made easierbecause there is no need for a crane to install mostRexnord Addax advanced composite coupling systems.Most cooling tower coupling assemblies weigh less than100 pounds, so maintenance personnel can easilyhandle them.
The specific modulus of the composite material is3.5 to 5 times that of steel alloys. This allows thecomposite spacers to span almost twice thedistance of a comparable metal spacer without theneed for intermediate bearings. The lower densityand higher specific stiffness of composite materialsmake it practical to use larger cylinder diametersthan would be feasible with steel.
A single length, 20-foot long composite drive shaftfrom a Rexnord Addax coupling may weigh 100pounds while the steel counterpart would weigh about500 pounds and be in two sections! Elimination ofsteady bearings means drastically reduced maintenancerequirements, at lower cost of ownership and increasedreliability.Standard corrosion resistance exceeds that of 216ss; orRexnord Addax associates can formulate corrosionresistance for specific conditions. Additional ultra-violetlight protection is provided by a carbon black additive.
Rexnord Addax Composite Center Section
Low weight Corrosion
resistance
Extendedbearing life Reduced
vibration Elimination of
intermediatebearings
No lubrication
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This patented Rexnord Addax flexible element wasdeveloped to withstand harsh conditions andhigh-misalignment problems found in cooling towers.This flexible element is a unitized disc constructed of
advanced composite materialand stainless steel bushings. Allflex elements are encapsulatedin urethane for ease of handling,appearance, and to preventfretting and corrosion.The exceptional physical andmechanical properties ofcontinuous fiber provides highmisalignment capacity and longservice life.Rexnord Addax flexibleelements provide infinitefatigue life and simplifiedinstallation.
The Rexnord Addax coupling flange is an integralcomponent of the Rexnord Addax coupling. Thispatented component transfers torque from the flexibleelement to the long span composite tube. It is a
low-mass, all composite structure fabricated fromcontinuous fiber material. There is no metal in it at all.The fiber angle path has been optimized for carryingtorque and minimizing stress through the flange. Thisdesign offers supreme fatigue strength for cooling toweroperation. It also offers extraordinary corrosionresistance in a chlorine rich cooling tower environment.One of the design features is a high fiber volumecomposite reinforcing ring (cross hatched area) designedintegral into the flange area. This ring providesadditional strength and stiffness in the bolt joint area.
This strength in the flange provides the highest integrityfor the bolt circle attaching and centering the flexibleelement.Other manufacturers fabricate this flange from randomfiber glass and do not have the fatigue strength of theAddax coupling flange. A random fiber flange does nothave the reinforcing ring and is prone to fatigue failurein the grueling cooling tower duty applications. TheRexnord Addax coupling flange is continuous fiberand fatigue tested to demonstrate superior strength.
4
U S P A T E N
T
6 9 0 5 4 1 6
P A R T N 0 . 2 0 0 8 1 7 - 0 4 0
REXNORD ADDAX
Rexnord Addax Patented Composite Flexible Element
High-strength
composite Designed for
severe conditions One-degree
misalignment perflexible element
Exceptionalservice life
No fretting andcorrosion effects
Fretting and stress crack corrosion the leadingcontributors to metal disc pack failure are completelyeliminated along with the multitude of parts required forassembly. Maintenance costs are dramatically reducedand installation is greatly simplified. Rexnord Addax flexible elements provide years of trouble-free operation,even under the most demanding conditions.Rexnord Addax elements are offered in a number ofsizes with different torque ratings. Each torque rating isbased on static and dynamic tests to provide an infinitefatigue life at rated torque and misalignment.The flexible element is the only component of thecoupling system that experiences alternating loading inwhich fatigue becomes a factor. The strength ofgraphite/epoxy remains well over 100,000 psi throughinfinite cycles. Therefore, the Rexnord Addax flexibleelement has theoretical infinite fatigue life under ratedoperating conditions.
Rexnord Addax Patented Continuous Fiber Composite Flange
Patent No. 5724715.
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Rexnord Industries, LLC, 2007. (2022) 5
WARRANTY
Seller warrants that its products (i) conform to Sellerspublished specifications, and (ii) are free from defects inmaterial or workmanship for one year from the date ofshipment. Specific products may have a warranty periodgreater than one year. Please refer to the appropriatedocument and to Sellers website for the specific warranty. IfBuyer discovers a failure of any product to conform to thesewarranties within this period, it must promptly notify Seller inwriting. Seller will attempt to repair such non-conformingproduct at no charge to the Buyer. If Seller in unable to repairthe product to conform to these warranties after a reasonablenumber of attempts, or if Seller determines at any time thatrepair is impracticable, it will provide, at its own discretion,one of the following: (i) replacement product, or (ii) a fullrefund of that portion of the purchase price allocable to thenon-conforming product. These remedies are the exclusiveremedies for breach of warranty.
WHAT IS NOT COVERED BY THIS WARRANTYNo representative of Seller has any authority to waive, alter,vary, or add to the terms hereof of without prior approval inwriting, signed by an officer of our company. It is expresslyagreed that the entire warranty given to the Purchaser isembodied in this writing. Company does not warrant anydefects in, damage to, or failure of products caused by: (i)dynamic vibrations imposed by the drive system in which suchproducts are installed unless the nature of such vibrations hasbeen defined and accepted in writing by Company as acondition of operation, (ii) failure to provide suitableinstallation environment, (iii) use for purposes other thanthose for which designed, or other abuse or misuse, (iv)unauthorized attachments, modifications or disassembly, or(v) mishandling during shipping. Buyers care in selection,adequate testing at time of installation and proper
installation, proper operation and maintenance of all Productsare required for adequate performance.
DISCLAIMER OF WARRANTY:THE FORGOING WARRANTIES ARE IN LIEU OF ALL OTHERWARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOTLIMITED TO THE IMPLIED WARRANTIES OFMERCHANTABILITY AND FITNESS FOR A PARTICULARPURPOSE. IN NO EVENT SHALL COMPANY BE LIABLE INTORT OR CONTRACT OR UNDER ANY OTHER LEGAL OREQUITABLE THEORY OF LAW FOR ANY INCIDENTAL,SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES.
Rexnord Addax Coupling
Standard construction consists of a flanged composite spacer,patented composite flexible elements, 316 Stainless Steelhubs and 316 Stainless Steel hardware. K-500 Monelhardware are available upon request to suit corrosiveenvironments.
Standard Balance
All couplings are dynamically balanced to meet ANSI/AGMA9000-C90 (R96), Class 9 specifications.
Rexnord Addax Coupling Catalog
Table of ContentsFeatures, Functions, and Benefits . . . . . . . . . . . . . . . . . . . 2Composite Center Section . . . . . . . . . . . . . . . . . . . . . . . . . 3Patented Composite Flexible Element . . . . . . . . . . . . . . . . . 4Patented Continuous Fiber Spacer Flange . . . . . . . . . . . . . . 4Warranty Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Balance specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5General and Engineering Dimensions . . . . . . . . . . . . . . . . . 6Blade Pass Frequency Information . . . . . . . . . . . . . . . . . . . 7Models & Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Cooling Tower Backstop . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Cooling Tower Coupling Application Data Sheet . . . . . . . . . 10
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General and Engineering Dimensions H
6 (2022) Rexnord Industries, LLC, 2007.
MODELSERIES
Spacer &Flange
Material Q
Max DBSE @1780 rpm@ 1.15 SF
Max DBSE @1480 rpm@ 1.15 SF
Max BoreA
B CD MinDBSE
MinBoreSt anda rd Ove rsi zed S ta nd ar d O ve rs ize d S ta nda rd Ov er si ze d
350.275F 95 / 2413 106 / 2692
2.13 / 55 2.38 / 65 5.25133 3.06 / 78 4.00 /102 1.81 / 46 2.6 / 66 2.75 / 705.4137
0.6316
A 107 / 2718 119 / 3023R 114 / 2896 126 / 3200
375.275F 95 / 2413 106 / 2692
2.13 / 55 2.38 / 65 5.25133 3.06 / 78 4.00 /102 1.81 / 46 2.6 / 66 2.75 / 705.4137
A 107 / 2718 119 / 3023
R 114 / 2896 126 / 3200
450.275
F 95 / 2413 106 / 2692
2.13 / 55 2.88 / 75 5.25133 3.15 / 46 4.00 / 102 1.81/ 46 2.63 / 67 2.75 / 705.4137
A 107 / 2718 119 / 3023R 114 / 2896 126 / 3200X 128 / 3251 141 / 3581
485.338F 100 / 2540 113 / 2870
2.63 / 70 3.38 / 85 6.00152 3.72 / 94 4.75 / 121 2.75 / 70 2.75 / 70
3.38 / 86 8.0203A 116 / 2946 127 / 3226R 127 / 3226 140 / 3556
485.425R 141 / 3581 154 / 3912
4.25 /108 8.0203X 154 / 3912 169 / 4293
485.625 R 170 / 4318 189 / 4800 6.25 / 159 9.5 / 241
650.425A 133 / 3378 148 / 3759
3.00 / 80 3.88 / 100 6.75171 5.25 / 133 6.75 / 171 2.56 / 65 2.75 / 70
4.25 / 108 6152
1.0025
R 141 / 3581 154 / 3912X 154 / 3912 169 / 4293
650.625R 170 / 4318 189 / 4800
6.25/1609.5241
X 186 / 4725 208 / 5283
650.825R 193 / 4902 215 / 5461
8.25/210X 209 / 5309 232 / 5893
850.625A 157 / 3988 172 / 4369
4.13 / 105 5.06 / 130 9.0229 5.8 / 147 7.5 / 191 3.31 / 84.1 3.5 / 89
6.25 / 160
14.2361
R 170 / 4318 189 / 4800X 186 / 4725 208 / 5283
850.825R 193 / 4902 215 / 5461
8.25 / 210X 209 / 5309 232 / 5893
850.1025 X 229 / 5817 253 / 6426 10.25 / 260
850.1275 X 245 / 6223 275 / 6985 12.75 / 324
Units ofMeasure
US in in in in in in in in in in in inSI mm mm mm mm mm mm mm mm mm mm mm mm
MODELSERIES
Spacer& Flange Material Q
Weight@ Min DBSE
WR2@ Min DBSE l
Weight Changeper Length
WR2 Changeper Length l
Continuous Torque@ 1.0 SF
Continuous Torque@ 2.0 SF
PeakOverload
Torque
350.275F
13.8 / 6.2 32 / 0.00930.07 / 1.5 0.13 / 0.0015
3,617408
1,808204
5,425613
A 0.06 / 1.2 0.11 / 0.0013R 0.06 / 1.1 0.10 / 0.0012
375.275F
13.8 / 6.2 32 / 0.00930.07 / 1.5 0.13 / 0.0015 5,311
6002,660300
7,967900
A 0.06 / 1.2 0.11 / 0.0013R 0.06 / 1.1 0.10 / 0.0012
450.275
F
12.9 / 5.9 32 / 0.0092
0.07 / 1.5 0.13 / 0.00157,250820
3,625410
10,8751229
A 0.06 / 1.2 0.11 / 0.0013R 0.06 / 1.1 0.10 / 0.0012X 0.06 / 1.2 0.10 / 0.0012
485.338F
23.4 / 10.6 47 / 0.0140.09 / 1.8 0.24 / 0.0029
11,0001243
5,500621
16,5001864
A 0.08 / 1.5 0.21 / 0.0024R 0.07 / 1.4 0.19 / 0.22
485.425R
24.0 /10.9 74 / .0220.09 / 1.7 0.38 / 0.0044
X 0.09 / 1.8 0.39 / 0.0045
485.625 R 26.5 /12.0 92 / 0.027 0.13 / 2.6 1.2 / 0.015
650.425A
31.5 / 14.3 122 / 0.0360.10 / 1.9 0.42 / 0.0049
18,1002045
9,0501022
27,1503067
R 0.089 / 1.7 0.38 / 0.0044X 0.092 / 1.8 0.39 / 0.005
650.625R
34.4 / 15.6 141 / 0.0410.13 / 2.6 1.2 / 0.014
X 0.14 / 2.7 1.3 / 0.015
650.825 R 37.9 / 17.2 194 / 0.056 0.18 / 3.4 2.9 / 0.033X 0.18 / 3.6 3.0 / 0.035
850.625A
63.6 / 28.8 440 / 0.1300.15 / 2.9 1.4 / 0.016
36,2004090
18,1002045
54,3006135
R 0.13 / 2.6 1.2 / 0.014X 0.14 / 2.7 1.3 / 0.015
850.825R
68.5 / 31.0 512 / 0.150.18 / 3.4 2.9 / 0.033
X 0.18 / 3.6 3.0 / 0.035
850.1025 X 74.8 / 33.9 657 / 0.19 0.23 / 4.4 5.8 / 0.067
850.1275 X 78.4 / 35.6 768 / 0.22 0.28 / 5.5 11.3 / 0.13
Units ofMeasure
US lb lb-in 2 lb/in lb-in 2 /in in-lb in-lb in-lbSI kg kg-m 2 kg/m kg-m 2 /m Nm Nm Nm
H All dimensional values are subject to change without notice.Q F=Fiberglass; A=Amalgamation; R=Standard Carbon Fiber; X =Special Carbon Fiber.l The standard weight and WR 2 values are at minimum DBSE and standard minimum bore for a complete assembly. To determine the total weight or inertia, sub tract the minimum DBSE from
the total DBSE required and multiply that value times the WT and/or WR 2 change per length then add that calculated WT or WR 2 to the minimum DBSE values. Values may vary slightlydepending on the actual bore and key size.
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Engineering DataDrive Shaft Vibration Caused by Blade PassFrequency (BPF)Lateral Natural Frequency (LNF) relates to beam stiffness andmass of the composite coupling. All beams have a naturalfrequency. The Rexnord Addax driveshaft is a long slenderbeam that has a LNF commonly referred to as critical speed.Critical speed of the shaft is calculated in SelectC 2007 and
is supplied to our customers. Blade pass frequency (BPF) isthe number of blades multiplied by the fan speed. Fan bladesin a cooling tower induce a forcing frequency caused bypressure pulsations on adjacent components including thedrive shaft.Blade pass vibration is caused by pressure pulsations on thedrive shaft when the shafts natural frequency is coincidentwith the fan blade pass frequency. When the drive shaft isexperiencing a blade pass harmonic, sometimes it can be seenbouncing out of plane. This shaft vibration usually manifestsitself in the motor and gearbox. Shaft natural frequency andblade pass frequency must be designed 8% away to haveassurance there is no overlap. Rexnord Addax shafts exhibitminimal vibration contributing to the overall spectrum.Additionally, gear mesh frequency can be heard resonatingfrom the drive shaft, however this is typically at a much higherfrequency magnitude than blade pass frequency.
The Cooling Technology Institute (CTI) recommends a 1.3factor - critical speed over operating speed. The 1.3 factorwas established prior to composite shafts when only steeldrive shafts were used. Steel shafting is massive, deflectsfrom thermal growth, less predictable and potentiallydangerous when approaching critical speed. Composite shaftsare less than 1/3 the mass of a steel and dimensionally
stable. As composite shafts offer 1/3 less mass the deflectionmagnitude is significantly less than steel and safe whenapproaching critical speed. Rigorous testing has proven that a1.3 margin is not required for composite shafting and a 1.15margin is adequate. Each Rexnord Addax shaft size andmaterial was tested and manufacturing variability accounts forless than 3% of the variability in the shafts LNF. It is notrecommended to use a 1.15 safety factor when purchasingshafts from other manufacturers because they may haveexcessive mfg variability. Manufacturing variability of theRexnord Addax shaft accounts for less than 3% of thevariability in the shafts LNF. These facts demonstrate that a15% safety margin over operating speed is adequate for safedrive shaft service.
Rexnord Industries, LLC, 2007. (2022) 7
AXIS OF ROTATION
- DEFLECTION
+ DEFLECTION
- DEFLECTION
+ DEFLECTION
BLADE PASS FREQUENCY = or LATERAL CRITICAL DRIVE SHAFT 1/ 3
LATERAL CRITICAL FREQUENCY
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Rexnord Addax Composite Couplings
8 (2022) Rexnord Industries, LLC, 2007.
DCOMPOSITESPACER
A B
COVERSIZEDHUB
B
STANDARDHUB
COMPOSITEFLEXIBLE ELEMENT
DBSE
SPACER LENGTH
Models: 350.275, 375.275, 450.275, 485.338, 650.425, 850.625
DCOMPOSITESPACER
A B
COVERSIZEDHUB
B
STANDARDHUB
COMPOSITEFLEXIBLE ELEMENT
DBSE
SPACER LENGTH
Models: 485.425, 650.625, 650.825, 850.825, 850.1025, 850.1275
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Rexnord Cooling Tower Backstop
Rexnord Industries, LLC, 2007. (2022) 9
Bolt-On Backstop Tabulation
MODELMating Hub Backstop Bolting Information
OD W (Ref)Pawl Diameter (Ref)
CompressedSpeed (rpm Ref)B. C. Diameter Hole Diameter TighteningTorque Compressed Sprung
350/375/450 3.500 .3125 40 in-lb
9 1 / 16 1 1 / 8 9 3 / 16 10 9 / 16 400 rpm Ref485 4.063 .3125 142 in-lb650 4.625 .3750 225 in-lb
850 4.875 .5000 350 in-lb
OD
W A
A
B.C.DIAMETER
NOTES:
1. 162 & 200 SIZE SUPPLIED WITH(4) SOCKET HEAD CAP SCREWS. ALL OTHER SIZES SUPPLIED WITH(4) HEX HEAD CAP SCREWS.
2. BACKSTOP MAY BE INVERSELYMOUNTED FOR OPPOSITE ROTATION
CW OPERATIONCCW BACKSTOP
- MATE-UP BOLTING SUPPLIED WITH BACKSTOP ASSEMBLY
SECTION A -A
MAX BORESPRUNGPAWL DIAMETER (NO OPERATION)
COMPRESSEDPAWL DIAMETER (RUNNING)
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Rexnord Addax Cooling Tower Couplings
Motor Data:HorsePower:
RPM:
NEMA or IEC Frame Size:Motor Shaft Diameter:
Key Size:
Two Speed? Yes No High Speed: Low Speed:
Variable Speed: Yes No Max Speed: Min Speed:
Gear Reducer Date:Reduction Ratio:
Input Shaft Diameter:
Key Size:
Fan Data:Number of Blades:
Fan RPM:
10 (2022) Rexnord Industries, LLC, 2007.
(Distance Between Shaft Ends is defined as the length measured between the face of the gear box input shaft and the face of themotor shaft to within 0.10 inches (2.5mm).
DBSE
MOTOR SHAFT END
GEAR REDUCER SHAFT ENDFAN
GEAR REDUCER MOTOR
Cooling Tower Coupling Application Data SheetQuote/Job Number:
Customer:
DBSE:
Date:
Location:
Quantity:
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NOTES
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World Class Customer ServiceFor more than 100 years, the dedicated people of Rexnordhave delivered excellence in quality and service to ourcustomers around the globe. Rexnord is a trusted name whenit comes to providing skillfully engineered products thatimprove productivity and efficiency for industrial applicationsworldwide. We are committed to exceeding customerexpectations in every area of our business: product design,application engineering, operations, and customer service.
Because of our customer focus, we are able to thoroughlyunderstand the needs of your business and have the resources
available to work closely with you to reduce maintenancecosts, eliminate redundant inventories and prevent equipmentdown time.
Rexnord represents the most comprehensive portfolio of powertransmission and conveying components in the world with thebrands you know and trust.
Rexnord Industries, LLC, 6040 Fletcher Avenue, Lincoln, NB 68507 USAPhone: 402-325-6000 Fax: 402-325-6406
2007 Rexnord Industries LLC
2022 10/2007 Delzer Litho Printed in USA
Rexnord and Addax are registered trademarks of Rexnord Industries, LLC. All rights reserved.
WORLDWID E CUSTOMER SERVICE
AUSTRALIA
Rexnord Australia Pty. Ltd.Picton, New South WalesPhone: 61-2-4677-3811Fax: 61-2-4677-3812Falk-Rexnord Australia Pty LtdBroadmeadow NSW AustraliaPhone: 61-2-4962-8000Fax: 61-2-4962-8001BRAZIL
Rexnord Correntes Ltda.Sao Leopoldo - RSPhone: 55-51-579-8022Fax: 55-51-579-8029
Rexnord Canada Ltd.Scarborough, OntarioPhone: 1-416-297-6868Fax: 1-416-297-6873CHINA
Rexnord ChinaShanghai, ChinaPhone: 86-21-62701942Fax: 86-21-62701943
EUROPERexnord NV/SAMechelen, BelgiumPhone: 32-15-.443811Fax: 32-15-443860Rexnord Kette GmbHBetzdorf, GermanyPhone: 49-2741-2840Fax: 49-2741-284-385
LATIN AMERICA
Rexnord International, Inc.Milwaukee, WisconsinPhone: 1-414-643-2366Fax: 1-414-643-3222E-mail:[email protected]
MEXICO
Rexnord S A De C V
Mexico DF, MexicoPhone: 52-55-9140-3500Fax: 52-55-9140-3550SINGAPORE
Rexnord International, Inc.Singapore City, SingaporePhone: 65-6338-5622Fax: 65-6338-5422
UNITED STATES
Customer ServicePhone: 1-866-REXNORD
(1-866-739-6673)Fax: 1-614-675-1898E-mail: rexnordcs(state)@rexnord.comExample: [email protected]
ALL COUNTRIES NOT LISTED
Rexnord InternationalMilwaukee, WisconsinPhone: 1-414-643-2366Fax: 1-414-643-3222E-mail: [email protected]