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MERI N
GE R M NUF TURERS
SSO I TION
o d lassification nd Service
actors for lexible ouplings
AGMA INFORMATION SHEET
This Information Sheet is NOT an AGMA Standard
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Load lassification n Service Factors
for
Flexible ouplings
AGMA 922 A96
American
Gear
Manufacturers
CAUTION NOTICE: AGMA technical publications are subject to constant improvement
Association
revision or withdrawal as dictated by experience. Any person who refers to any AGMA
technical publication should be sure that the publication is the latest available from the As-
sociation on the subject matter.
[fables or other self supporting sections may be quoted or extracted in their entirety.
Credit lines should read: extracted from AGMA 922 A96
Load lassification n Service
Factors for Flexible ouplings
with the permission of the publisher the American Gear
Manufacturers Association 1500 King Street Suite 201 Alexandria Virginia 22314.]
Approved September 18 1996
ABSTRACT
This information sheet provides suggested load classifications and related service factors that are most fre-
quently used for various flexible coupling applications. Typical applications using smooth prime movers are
listed. Special considerations which may involve unusual or severe loading are also discussed.
Published by
American Gear Manufacturers Association
1500
King
Street Suite 201 Alexandria
Virginia
22314
Copyright
1996 by American Gear Manufacturers Association
All rights reserved.
No part of this publication may be reproduced in any form in an electronic
retrieval system or otherwise without prior written permission of the publisher.
Printed in the United States of America
ISBN: 1 55589 68 4
ii
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AGMA 922 A96
ontents
Page
Foreword v
1 Scope
2 References
3 Responsibility
4 Load classification
5 Service factors 6
ables
1 Load classification and service factors 2
2 Load classifications and typical service factors for flexible coupling
applications 2
iii
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AGMA922 A96
iv
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orewor
[The foreword is provided for informational purposes only and should not be construed as a
part of AGMA 922 A96 Load lassification and Service Factors for Flexible ouplings ]
This document was developed originally as standard AGMA 514.01 by the Flexible
Coupling Product Group of AGMA to show some of the applications for flexible couplings
and to serve as a guide to the character ofthe loads found inthese applications. Itmade no
attempt to include all possible applications for flexible couplings but a sufficient number and
variety were covered to serve as a guide for proper application.
The load classif ication and service factors shown in this document vary for some types of
equipment from identical or similar equipment as shown in other AGMA Standards. Such
variations are not errors or discrepancies but have been determined based on design
construction and limitations of the flexible coupling.
The first draft of AGMA 514.01 was prepared by the Flexible Coupling Technical Committee
in January 1968. It was approved by Flexible Coupling Product Group 7 on October 20
1968. AGMA514.01 became an official AGMAstandard on May 27 1969. AGMA514.02
was a revision of AGMA 514.01. The major change was the addition of Service Factors to
table 2. AGMA 514.02 was approved by the AGMA Membership on October 22 1971.
The Flexible Couplings Committee voted to change the standard to an information sheet.
The only changes made were editorial necessary to reflect an information sheet.
Suggestions for the improvement ofthis information sheet will be welcome. They should be
sent to the American Gear Manufacturers Association 1500 King Street Suite 201
Alexandria Virginia 22314.
AGMA 9 A96
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GM 9 A96
vi
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AGMA
9 A96
PERSONNEL of the GM Flexible Couplings Committee
Chairman: Donald B. Cutler Rexnord Corporation
Vice Chairman: Glenn Pokrandt The Falk Corporation
CTIVE MEM ERS
T.G. Fromknecht Zurn Industries Inc.
J.R. Mancuso Kop Flex Inc.
J.D. Tennies Renold Inc.
R.G. Thompson Deck Manufacturing Corporation
SSOCI TE MEM ERS
S. Chen Kop Flex Inc.
Dixon Metal Improvement Company
T. Hewitt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rexnord Corporation
D.W. Hindman Rexnord Corporation
V. Ivers Xtek Inc.
E.C. Kus Deck Manufacturing Corporation
D. Lindsay Emerson Power Transmission
J.W. Mahan Lovejoy Inc.
J.D. Mays Rexnord Corporation
R.E. Munyon Kop Flex Inc.
J. Paluh Zurn Industries Inc.
S.L. Pearson Mobil Oil Corporation
A. E. Phillips Dodge/Rockwell Automation
W. Pizzichil Philadelphia Gear Corporation
R. Post Renold Inc.
D. Reynolds Dodge/Rockwell Automation
E.I. Rivin Wayne State University
T.M. Schatzka Lovejoy Inc.
J.F. Slusarick Huffman Corporation
R. Whitney Emerson Power Transmission
vii
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AGMA 922 A96
viii
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AMERICAN GEAR MANUFACTURERS ASSOCIATION
American Gear Manufacturers
Association -
Load Classification and
Service Factors for
Flexible Couplings
1 Scope
The p ur po se of this i nf or mati on s he et is to list and
classify the character of the load, and the suggested
service factor for various applications, so that proper
f le xible cou plin g selection can be made for a given
service.
1.1
Applicability
This i nfor mation s hee t is a ppl ica bl e to s tandar d
couplings as defined in AGMA 510.03.
1.2 Exceptions
Itis recognized that there are couplings for which the
service factor values shown in this information sheet
are not necessarily applicable. For specific applica
tion information, refer to the manufacturer s catalog
or recommendations.
AGMA
acknowledges the
right of any manufacturer to use different selection
methods, or service factors, or both for their specific
product.
2 References
The following documents contain provisions which,
through reference in this text, constitute provisions of
the information sheet. At the time of publication, the
e ditions were valid. All p ub lica tion s are sub je ct to
revision, and the users of this information sheet are
encouraged to investigate the possibility of applying
the most recent editions of the publications listed.
AGMA 510.03, Nomenclature for Flexible Cou-
plings 1984 .
AGMA 9 A96
3 Responsibil ity
3.1
Applications
The manufacturer s published warranty applies to
the flexible couplings described in this publication.
The following conditions are typical and are beyond
the manufacturer s responsibility.
The flexible coupling is protected as pre
scrib ed by the m an ufactu re r, in e ithe r insid e or
outside storage, between the interval of its receipt
by the buyer and actual installation;
The fl exi ble c oupl ing is pr oper ly i nstall ed
and maintained in accordance with the
manufacturer s instructions;
The system of connected rotating parts is
compatible, free from critical speed, torsional and
other type vibration within the specified operating
speed range, no matter how induced;
The imposed torsional load, speed and
m is al ign men t are within the c apa ci ty limits for
which the units were sold, or as speci fi ed in the
purchase contract.
3.2 Systems analysis
R espo nsib il ity for syste m a na lysis in com plia nce
with these requirements rests with the purchaser of
the flexible coupling.
3.3 Exceptions
Excep tion s to any of the foreg oing p ro vision s are a
matter of specific contractual agreements.
NOTE: Service factors and loadclassifications for any
equipment used to
move
or convey
people
is beyond
the intent of this information sheet. Consult the
manufacturer for recommendations.
4 Load classification
The broad categories of load classification are
sho wn in tab le T he y are class ifi ed in the t hr ee
com mo nly recog nize d load cla sses: U nifo rm U),
M od erate Sho ck M), and H ea vy Sho ck H). The se
load classifications are based on normal operation of
the drive s ys te m. Load class ifi cation for v ar io us
applications are given in table 2.
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AGMA9 A96
Table 1 - Load classification and service factors
Load classification
Normal service
factor
range
Uniform U
1.0 - 1.5
Moderate Shock M 1.5 - 2.5
Heavy Shock H
2.5 and over
NOTE:
1
The range of values signifies increasing reliability, longer life or more severe duty requirements.
See 5.1.
Table 2 - Load classifications and typical service factors
fo r
flexible
coupling
applications
Load classification Typical service factor
Application
see 5.1 and table 1
see 5.2
Agitators
Pure liquids U
1.00
Liquids and solids U 1.25
Liquids - variable density
U
1.25
Blowers
Centrifugal
U
1.00
Lobe U
1.50
Vane U
1.25
Brewing
and
distilling
Bottling machinery U
1.00
Lauter tub U
1.25
Briquetter machines
M
2.00
Can
filling
machines
U
1.00
Cane knives
M 2.00
Car dumpers
M
2.50
Car pullers -
intermittent duty
U
1.50
Clay
working
machinery
M
1.75
Compressors
Centrifugal
U
1.25
Lobe
U
1.50
Reciprocating - multi-cylinder
M
2.00
Conveyors
-
uniformly loaded or fed
Apron
U
1.25
Assembly
U
1.00
Belt
U
1.00
Bucket
U
1.25
Chain
U
1.25
Flight U
1.25
Oven U
1.50
Screw U
1.25
Conveyors
-
heavy duty not uniformly fed
Apron
M 1.50
Assembly
U
1.25
Belt
U
1.25
Bucket
U
1.50
Chain
U
1.50
Flight
U
1.50
Oven
U
1.50
continued
2
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Table 2 continued
AGMA 9 A96
Load classification
Typical service factor
Application
see 5.1 and table 1
see 5.2
Conveyors -
heavy duty continued
Reciprocating
M
2.50
Screw
M
1.50
Shaker
H
2.50
Cranes and hoists
Main hoists
M
2.00
Reversing
M
2.00
Skip hoists
M
1.75
Trolley drive
M
1.75
Bridge drive
M
1.75
Slope
M
1.50
Crushers
Ore
H
2.75
Stone
H
2.75
Dredges
Cable reels
M
1.75
Conveyors
U
1.50
Cutter head drives
M
2.25
Jig drives
M
2.25
Maneuvering winches
M
1.75
Pumps
M
1.75
Screen drive
M
1.75
Stackers
M
1.75
Utility winches
M
1.50
Elevators
Bucket
M
1.75
Centrifugal discharge
M
1.50
Freight
M
2.00
Gravity discharge U 1.50
Fans
Centrifugal
U
1.00
Cooling towers
M
2.00
Forced draft
U
1.50
Induced draft without damper control
M
2.00
Feeders
Apron
U
1.25
Belt
U
1.25
Disc
U
1.25
Reciprocating
H
2.50
Screw
U
1.25
Food industry
Beet slicer
M
1.75
Cereal cooker U 1.25
Dough mixer
M
1.75
Meat grinders
M
1.75
Bottling, can filling machine
U
1.00
Generators
not welding
U
1.00
Hammer mills
M
2.00
Laundry washers
Reversing
M
2.00
Laundry tumblers
M
2.00
continued
3
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AGMA9 A96
Table 2 continued
Load classification
Typical service factor
Application
see 5.1 and table 1)
see 5.2)
Lumber
industry
Barkers - drum type
M
2.00
Edger feed
M
2.00
Live rolls
M
2.00
Log haul - incline
M
2.00
Log haul - well type
M
2.00
Off bearing rolls
M
2.00
Planer feed chains
M
1.75
Planer floor chains
M
1.75
Planer tilting hoist
M
1.75
Slab conveyor
M
1.50
Sorting table
1.50
Trimmer feed
M
1.75
Machine tools
Bending roll M 2.00
Plate planer
M
1.50
Punch press - gear driven
M
2.00
Tapping machines
M
2.50
Other machine tools
Main drives
M
1.50
Auxiliary drives
1.25
Metal mills
Draw bench - carriage
M
2.00
Draw bench - main drive
M
2.00
Forming machines
M
2.00
Slitters
1.50
Table conveyors
Non-reversing
M
2.25
Reversing
H
2.50
Wire drawing flattening machine
M
2.00
Wire winding machine
M
1.75
Mills, rotary type
Ball
M
2.25
Cement kilns
M
2.00
Dryers coolers
M
2.00
Kilns
M
2.00
Pebble
M
2.00
Rod
M
2.00
Tumbling barrels
M
2.00
Mixers
Concrete mixers
M
1.75
Drum type
M
1.50
Oil
industry
Chillers
1.25
Oil well pumping
M
2.00
Paraffin filter press
M
1.75
Rotary kilns
M
2.00
Paper mills
Barker auxiliaries, hydraulic
M
2.00
Barker, mechanical
M
2.00
Barking drum spur gear only)
M
2.25
Beater pulper
M
1.75
continued
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Table 2 continued
AGMA 9 A96
Load classification
Typical service factor
Application
see 5.1 and table 1)
ee 5.2)
Paper
mills
continued
Bleacher
U
1.00
Calenders
M
2.00
Converting machines, except cutlers, platers
U
1.50
Couch
M
1.75
Cutlers, platers
M
2.00
Cylinders
M
1.75
Dryers
M
1.75
Felt stretcher
U
1.25
Felt whipper
M
2.00
Jordans
M
1.75
Log haul
M
2.00
Presses
M
2.00
Reel
U
1.50
Stock chests
U
1.50
Suction roll
M
1.75
Washers and thickeners
U
1.50
Winders
M
1.50
Printing presses
M
1.50
Pullers
Barge haul
M
2.00
Pumps
Centrifugal
U
1.00
Reciprocating
Double acting
M
2.00
Single acting
1 or 2 cyl inders
M
2.25
3 or more cyl inders
M
1.75
Rotary - gear, lobe, vane
U
1.50
Rubber industry
Mixer - Banbury
M
2.50
Rubber calender
M
2.00
Rubber mill 2 or more)
M
2.25
Sheeter
M
2.00
Tire building machines
M
2.50
Tire tube press openers
U
1.00
Tubers and strainers
M
2.00
Screens
Air washing
U
1.00
Rotary - s tone or gravel
M
1.50
Travel water intake
U
1.25
Sewage disposal equipment
Bar screens
U
1.25
Chemical feeders
U
1.25
Collectors, circular or straight line
U
1.25
Dewatering screens
U
1.25
Grit collectors
U
1.25
Scum breakers
U
1.25
Slow or rapid mixers
U
1.25
Sludge collectors
U
1.25
Thickeners
U
1.25
Vacuum filters
U
1.25
continued
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AGMA9 A96
Table 2 concluded
Load classification
Typical service factor
Application
see 5.1 and table 1 see 5.2
Steering gear U 1.00
Stokers
U
1.00
Textile industry
Batchers
U
1.25
Calenders
M
1.75
Card machines
M
1.50
Cloth finishing machines
washers, pads, tenters) U
1.50
dryers, calenders, etc.) M
1.75
Dry cans
Dryers M
1.50
Dyeing machinery U
1.25
Looms
M
1.50
Mangles U
1.25
Nappers U 1.25
Soapers U 1.25
Spinners
M
1.50
Tenter frames U
1.50
Winders other than batchers)
M
1.50
Windlass M
1.75
5 Service factors
Normal service factor range for each load
classification, table 1,is given as a range ofvalues to
indicate the scope of the load classification
designation and in recognition that different types of
flexible couplings may be affected differently by
loading. It is recognized that precise definition of
load classification cannot be made for many
applications, as evidenced by the listing of the
service factor value 1.5 in both the Uniform and
Moderate Shock classifications, and the service
factor value 2.5 in both the Moderate Shock and
Heavy Shock classifications. Selection of a service
factor value within - or beyond - the range should be
based upon the degree of reliability desired or upon
how the specific system may differ from normal or
average conditions for the type of application.
5.1 Typical applications
The service factors listed in tables 1 and 2 are
intended as a general guide for applications with
smooth prime movers such as electric or hydraulic
motors and steam turbines.
Service factors listed in table 2 are the values most
frequently used for the various applications listed.
They are based on normal operation of the drive
system. Higher or lower values may be used
6
depending upon the degree of reliability desired or
upon how the specific system may differ from
normal or average conditions for the type
application.
5.2 Special applications
Service factors listed in tables 1 and 2 represent the
normal relationship between flexible coupling design
power rating and prime mover continuous power
rating as listed on its nameplate. Applications
involving unusual or severe loading should be
carefully reviewed with the coupling manufacturer
before a service factor is applied.
5.2.1 Shock loading
Applications with high-torque motors and motors for
intermittent operations, and applications where
extreme repetitive shock occurs or where high
energy loads must be absorbed, as when stalling,
require special considerations and may not be
covered by the load classifications or service factors
given in tables 1 and 2.
5.2.2 Systems with brakes
When prime movers are equipped with brakes, and
the torque rating of the brakes exceeds the rating of
the prime mover, the rating of the brake dictates the
selection of the flexible coupling.
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PUBLISHED BY
AMERICAN GEAR MANUFACTURERS ASSOCIATION
15 KING STREET ALEXANDRIA VIRGINIA 22314