AGMA_922-A96

AGMA INFORMATION SHEET

AGMA922-A96

(This Information Sheet is NOT an AGMA Standard)

AGMA 922-A96

AMERICAN GEAR MANUFACTURERS ASSOCIATION

Load Classification and ServiceFactors for Flexible Couplings

ii

Load Classification and Service Factors for Flexible CouplingsAGMA 922--A96

CAUTION NOTICE: AGMA technical publications are subject to constant improvement,revision, or withdrawal as dictated by experience. Any person who refers to any AGMAtechnical publication should be sure that the publication is the latest available from the As-sociation on the subject matter.

[Tables or other self--supporting sections may be quoted or extracted in their entirety.Credit lines should read: extracted from AGMA 922--A96, Load Classification and ServiceFactors for Flexible Couplings, with the permission of the publisher, the American GearManufacturers Association, 1500 King Street, Suite 201, Alexandria, Virginia 22314.]

Approved September 18, 1996

ABSTRACTThis 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 arelisted. Special considerations which may involve unusual or severe loading are also discussed.

Published by

American Gear Manufacturers Association1500 King Street, Suite 201, Alexandria, Virginia 22314

Copyright 1996 by American Gear Manufacturers AssociationAll rights reserved.

No part of this publication may be reproduced in any form, in an electronicretrieval system or otherwise, without prior written permission of the publisher.

Printed in the United States of America

ISBN: 1--55589--680--4

AmericanGearManufacturersAssociation

AGMA 922--A96

iii

ContentsPage

Foreword v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1 Scope 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 References 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Responsibility 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Load classification 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Service factors 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1 Load classification and service factors 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Load classifications and typical service factors for flexible couplingapplications 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AGMA 922--A96

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AGMA 922--A96

v

Foreword

[The foreword is provided for informational purposes only and should not be construed as apart of AGMA 922--A96, Load Classification and Service Factors for Flexible Couplings.]

This document was developed originally as standard AGMA 514.01 by the FlexibleCoupling Product Group of AGMA to show some of the applications for flexible couplingsand to serve as a guide to the character of the loads found in these applications. It made noattempt to include all possible applications for flexible couplings, but a sufficient number andvariety were covered to serve as a guide for proper application.

The load classification and service factors shown in this document vary for some types ofequipment from identical or similar equipment as shown in other AGMA Standards. Suchvariations are not errors or discrepancies, but have been determined based on design,construction and limitations of the flexible coupling.

The first draft of AGMA514.01 was prepared by the Flexible Coupling Technical Committeein January 1968. It was approved by Flexible Coupling Product Group 7 on October 20,1968. AGMA 514.01 became an official AGMA standard on May 27, 1969. AGMA 514.02was a revision of AGMA 514.01. The major change was the addition of Service Factors totable 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 of this information sheet will be welcome. They should besent to the American Gear Manufacturers Association, 1500 King Street, Suite 201,Alexandria, Virginia, 22314.

AGMA 922--A96

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AGMA 922--A96

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PERSONNEL of the AGMA Flexible Couplings Committee

Chairman: Donald B. Cutler Rexnord Corporation. . . . . . . . . . . . . . . . . . . . . .Vice Chairman: Glenn Pokrandt The Falk Corporation. . . . . . . . . . . . . . . . . .

ACTIVE MEMBERS

T.G. Fromknecht Zurn Industries, Inc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .J.R. Mancuso Kop--Flex, Inc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .J.O. Tennies Renold, Inc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .R.G. Thompson Deck Manufacturing Corporation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ASSOCIATE MEMBERS

S. Chen Kop--Flex, Inc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .P. 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.O. 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

AGMA 922--A96

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1AGMA 922--A96AMERICAN GEAR MANUFACTURERS ASSOCIATION

American Gear ManufacturersAssociation --

Load Classification andService Factors forFlexible Couplings

1 Scope

The purpose of this information sheet is to list andclassify the character of the load, and the suggestedservice factor for various applications, so that properflexible coupling selection can be made for a givenservice.

1.1 Applicability

This information sheet is applicable to standardcouplings as defined in AGMA 510.03.

1.2 Exceptions

It is recognized that there are couplings for which theservice factor values shown in this information sheetare not necessarily applicable. For specific applica-tion information, refer to the manufacturers catalogor recommendations. AGMA acknowledges theright of any manufacturer to use different selectionmethods, or service factors, or both for their specificproduct.

2 References

The following documents contain provisions which,through reference in this text, constitute provisions ofthe information sheet. At the time of publication, theeditions were valid. All publications are subject torevision, and the users of this information sheet areencouraged to investigate the possibility of applyingthe most recent editions of the publications listed.

AGMA 510.03, Nomenclature for Flexible Cou-plings (1984).

3 Responsibility

3.1 Applications

The manufacturers published warranty applies tothe flexible couplings described in this publication.The following conditions are typical and are beyondthe manufacturers responsibility.

-- The flexible coupling is protected as pre-scribed by the manufacturer, in either inside oroutside storage, between the interval of its receiptby the buyer and actual installation;

-- The flexible coupling is properly installedand maintained in accordance with themanufacturers instructions;

-- The system of connected rotating parts iscompatible, free from critical speed, torsional andother type vibration within the specified operatingspeed range, no matter how induced;

-- The imposed torsional load, speed andmisalignment are within the capacity limits forwhich the units were sold, or as specified in thepurchase contract.

3.2 Systems analysis

Responsibility for system analysis in compliancewith these requirements rests with the purchaser ofthe flexible coupling.

3.3 Exceptions

Exceptions to any of the foregoing provisions are amatter of specific contractual agreements.

NOTE: Service factors and load classifications for anyequipment used tomove or convey people is beyondthe intent of this information sheet. Consult themanufacturer for recommendations.

4 Load classification

The broad categories of load classification areshown in table 1. They are classified in the threecommonly recognized load classes: Uniform (U),Moderate Shock (M), and Heavy Shock (H). Theseload classifications are based on normal operation ofthe drive system. Load classification for variousapplications are given in table 2.

AGMA 922--A96

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Table 1 -- Load classification and service factors

Load classification Normal service factor range1)

Uniform (U) 1.0 -- 1.5Moderate Shock (M) 1.5 -- 2.5Heavy Shock (H) 2.5 and overNOTE: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 for flexible coupling applications

ApplicationLoad classification(see 5.1 and table 1)

Typical service factor(see 5.2)

AgitatorsPure liquidsLiquids and solidsLiquids -- variable density

UUU

1.001.251.25

BlowersCentrifugalLobeVane

UUU

1.001.501.25

Brewing and distillingBottling machineryLauter tub

UU

1.001.25

Briquetter machines M 2.00Can filling machines U 1.00Cane knives M 2.00Car dumpers M 2.50Car pullers -- intermittent duty U 1.50Clay working machinery M 1.75Compressors

CentrifugalLobeReciprocating -- multi--cylinder

UUM

1.251.502.00

Conveyors -- uniformly loaded or fedApronAssemblyBeltBucketChainFlightOvenScrew

UUUUUUUU

1.251.001.001.251.251.251.501.25

Conveyors -- heavy duty not uniformly fedApronAssemblyBeltBucketChainFlightOven

MUUUUUU

1.501.251.251.501.501.501.50

(continued)

AGMA 922--A96

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Table 2 (continued)



Conveyors -- heavy duty (continued)ReciprocatingScrewShaker

MMH

2.501.502.50

Cranes and hoistsMain hoistsReversingSkip hoistsTrolley driveBridge driveSlope

MMMMMM

2.002.001.751.751.751.50

CrushersOreStone

HH

2.752.75

DredgesCable reelsConveyorsCutter head drivesJig drivesManeuvering winchesPumpsScreen driveStackersUtility winches

MUMMMMMMM

1.751.502.252.251.751.751.751.751.50

ElevatorsBucketCentrifugal dischargeFreightGravity discharge

MMMU

1.751.502.001.50

FansCentrifugalCooling towersForced draftInduced draft without damper control

UMUM

1.002.001.502.00

FeedersApronBeltDiscReciprocatingScrew

UUUHU

1.251.251.252.501.25

Food industryBeet slicerCereal cookerDough mixerMeat grindersBottling, can filling machine

MUMMU

1.751.251.751.751.00

Generators (not welding) U 1.00Hammer mills M 2.00Laundry washers

Reversing M 2.00Laundry tumblers M 2.00

(continued)

AGMA 922--A96

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Table 2 (continued)



Lumber industryBarkers -- drum typeEdger feedLive rollsLog haul -- inclineLog haul -- well typeOff bearing rollsPlaner feed chainsPlaner floor chainsPlaner tilting hoistSlab conveyorSorting tableTrimmer feed

MMMMMMMMMMUM

2.002.002.002.002.002.001.751.751.751.501.501.75

Machine toolsBending rollPlate planerPunch press -- gear drivenTapping machinesOther machine tools

Main drivesAuxiliary drives

MMMM

MU

2.001.502.002.50

1.501.25

Metal millsDraw bench -- carriageDraw bench -- main driveForming machinesSlittersTable conveyors

Non--reversingReversing

Wire drawing & flattening machineWire winding machine

MMMU

MHMM

2.002.002.001.50

2.252.502.001.75

Mills, rotary typeBallCement kilnsDryers & coolersKilnsPebbleRodTumbling barrels

MMMMMMM

2.252.002.002.002.002.002.00

MixersConcrete mixersDrum type

MM

1.751.50

Oil industryChillersOil well pumpingParaffin filter pressRotary kilns

UMMM

1.252.001.752.00

Paper millsBarker auxiliaries, hydraulicBarker, mechanicalBarking drum (spur gear only)Beater & pulper

MMMM

2.002.002.251.75

(continued)

AGMA 922--A96

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Table 2 (continued)



Paper mills (continued)BleacherCalendersConverting machines, except cutters, platersCouchCutters, platersCylindersDryersFelt stretcherFelt whipperJordansLog haulPressesReelStock chestsSuction rollWashers and thickenersWinders

UMUMMMMUMMMMUUMUM

1.002.001.501.752.001.751.751.252.001.752.002.001.501.501.751.501.50

Printing presses M 1.50

PullersBarge haul M 2.00

PumpsCentrifugalReciprocating

Double actingSingle acting

1 or 2 cylinders3 or more cylinders

Rotary -- gear, lobe, vane

U

M

MMU

1.00

2.00

2.251.751.50

Rubber industryMixer -- BanburyRubber calenderRubber mill (2 or more)SheeterTire building machinesTire & tube press openersTubers and strainers

MMMMMUM

2.502.002.252.002.501.002.00

ScreensAir washingRotary -- stone or gravelTravel water intake

UMU

1.001.501.25

Sewage disposal equipmentBar screensChemical feedersCollectors, circular or straight lineDewatering screensGrit collectorsScum breakersSlow or rapid mixersSludge collectorsThickenersVacuum filters

UUUUUUUUUU

1.251.251.251.251.251.251.251.251.251.25

(continued)

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Table 2 (concluded)



Steering gear U 1.00Stokers U 1.00Textile industry

BatchersCalendersCard machinesCloth finishing machines

(washers, pads, tenters)(dryers, calenders, etc.)

Dry cansDryersDyeing machineryLoomsManglesNappersSoapersSpinnersTenter framesWinders (other than batchers)

UMM

UM

MUMUUUMUM

1.251.751.50

1.501.75

1.501.251.501.251.251.251.501.501.50

Windlass M 1.75

5 Service factors

Normal service factor range for each loadclassification, table 1, is given as a range of values toindicate the scope of the load classificationdesignation and in recognition that different types offlexible couplings may be affected differently byloading. It is recognized that precise definition ofload classification cannot be made for manyapplications, as evidenced by the listing of theservice factor value 1.5 in both the Uniform andModerate Shock classifications, and the servicefactor value 2.5 in both the Moderate Shock andHeavy Shock classifications. Selection of a servicefactor value within -- or beyond -- the range should bebased upon the degree of reliability desired or uponhow the specific system may differ from normal oraverage conditions for the type of application.

5.1 Typical applications

The service factors listed in tables 1 and 2 areintended as a general guide for applications withsmooth prime movers such as electric or hydraulicmotors and steam turbines.

Service factors listed in table 2 are the values mostfrequently used for the various applications listed.They are based on normal operation of the drivesystem. Higher or lower values may be used

depending upon the degree of reliability desired orupon how the specific system may differ fromnormal or average conditions for the typeapplication.

5.2 Special applications

Service factors listed in tables 1 and 2 represent thenormal relationship between flexible coupling designpower rating and prime mover continuous powerrating as listed on its nameplate. Applicationsinvolving unusual or severe loading should becarefully reviewed with the coupling manufacturerbefore a service factor is applied.

5.2.1 Shock loading

Applications with high--torque motors and motors forintermittent operations, and applications whereextreme repetitive shock occurs or where high--energy loads must be absorbed, as when stalling,require special considerations and may not becovered by the load classifications or service factorsgiven in tables 1 and 2.

5.2.2 Systems with brakes

When prime movers are equipped with brakes, andthe torque rating of the brakes exceeds the rating ofthe prime mover, the rating of the brake dictates theselection of the flexible coupling.

PUBLISHED BYAMERICAN GEAR MANUFACTURERS ASSOCIATION1500 KING STREET, ALEXANDRIA, VIRGINIA 22314

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AGMA_922-A96