AGMA_922-A96

AGMA 922- A96

AMERICAN GEAR MANUFACTURERS ASSOCIATION

AGMA 922- A96

Load Classification and Service Factors for Flexible Couplings

AGMA INFORMATION SHEET (This Information Sheet is NOT an AGMA Standard)

American Gear Manufacturers Association

Load Classification and Service Factors for Flexible Couplings AGMA 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 AGMA technical publication should be sure that the publication is the latest available from the Association 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 Service Factors for Flexible Couplings, 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 frequently 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--680--4

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AGMA 922--A96

Contents Page

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 coupling applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

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AGMA 922--A96

This page is intentionally left blank.

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AGMA 922--A96

Foreword [The foreword is provided for informational purposes only and should not be construed as a part of AGMA 922--A96, Load Classification and Service Factors for Flexible Couplings.] 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 of the loads found in these applications. It made 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 classification 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. AGMA 514.01 became an official AGMA standard on May 27, 1969. AGMA 514.02 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 of this information sheet will be welcome. They should be sent to the American Gear Manufacturers Association, 1500 King Street, Suite 201, Alexandria, Virginia, 22314.

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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J.R. Mancuso . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J.O. Tennies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R.G. Thompson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Zurn Industries, Inc. Kop--Flex, Inc. Renold, Inc. Deck Manufacturing Corporation

ASSOCIATE MEMBERS S. Chen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P. Dixon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T. Hewitt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D.W. Hindman . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V. Ivers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E.C. Kus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. Lindsay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J.W. Mahan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J.O. Mays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R.E. Munyon . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J. Paluh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S.L. Pearson . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A. E. Phillips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . W. Pizzichil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R. Post . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D. Reynolds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E.I. Rivin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . T.M. Schatzka . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . J.F. Slusarick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . R. Whitney . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Kop--Flex, Inc. Metal Improvement Company Rexnord Corporation Rexnord Corporation Xtek, Inc. Deck Manufacturing Corporation Emerson Power Transmission Lovejoy, Inc. Rexnord Corporation Kop--Flex, Inc. Zurn Industries, Inc. Mobil Oil Corporation Dodge/Rockwell Automation Philadelphia Gear Corporation Renold, Inc. Dodge/Rockwell Automation Wayne State University Lovejoy, Inc. Huffman Corporation Emerson Power Transmission

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AMERICAN GEAR MANUFACTURERS ASSOCIATION

American Gear Manufacturers Association --

Load Classification and Service Factors for Flexible Couplings

AGMA 922--A96

3 Responsibility 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 prescribed by the manufacturer, in either inside or outside storage, between the interval of its receipt by the buyer and actual installation;

1 Scope

-- The flexible coupling is properly installed and maintained in accordance with the manufacturer’s instructions;

The purpose of this information sheet is to list and classify the character of the load, and the suggested service factor for various applications, so that proper flexible coupling selection can be made for a given service.

-- 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;

1.1 Applicability This information sheet is applicable to standard couplings as defined in AGMA 510.03. 1.2 Exceptions It is recognized that there are couplings for which the service factor values shown in this information sheet are not necessarily applicable. For specific application 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 editions were valid. All publications are subject 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 Couplings (1984).

-- The imposed torsional load, speed and misalignment are within the capacity limits for which the units were sold, or as specified in the purchase contract. 3.2 Systems analysis Responsibility for system analysis in compliance with these requirements rests with the purchaser of the flexible coupling. 3.3 Exceptions Exceptions to any of the foregoing provisions are a matter of specific contractual agreements. NOTE: Service factors and load classifications 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 shown in table 1. They are classified in the three commonly recognized load classes: Uniform (U), Moderate Shock (M), and Heavy Shock (H). These load classifications are based on normal operation of the drive system. Load classification for various applications are given in table 2.

1

AGMA 922--A96 Table 1 -- Load classification and service factors Load classification

Normal service factor range1)

Uniform (U) Moderate Shock (M)

1.0 -- 1.5 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 for flexible coupling applications Application Agitators Pure liquids Liquids and solids Liquids -- variable density Blowers Centrifugal Lobe Vane Brewing and distilling Bottling machinery Lauter tub Briquetter machines

Load classification (see 5.1 and table 1)

Typical service factor (see 5.2)

U U U

1.00 1.25 1.25

U U U

1.00 1.50 1.25

U U M

1.00 1.25 2.00

Can filling machines

U

1.00

Cane knives Car dumpers

M M

2.00 2.50

Car pullers -- intermittent duty Clay working machinery

U M

1.50 1.75

U U M

1.25 1.50 2.00

U U U U U U U U

1.25 1.00 1.00 1.25 1.25 1.25 1.50 1.25

M U U U U U U

1.50 1.25 1.25 1.50 1.50 1.50 1.50

Compressors Centrifugal Lobe Reciprocating -- multi--cylinder Conveyors -- uniformly loaded or fed Apron Assembly Belt Bucket Chain Flight Oven Screw Conveyors -- heavy duty not uniformly fed Apron Assembly Belt Bucket Chain Flight Oven

(continued) 2

AGMA 922--A96 Table 2 (continued) Application Conveyors -- heavy duty (continued) Reciprocating Screw Shaker Cranes and hoists Main hoists Reversing Skip hoists Trolley drive Bridge drive Slope Crushers Ore Stone Dredges Cable reels Conveyors Cutter head drives Jig drives Maneuvering winches Pumps Screen drive Stackers Utility winches Elevators Bucket Centrifugal discharge Freight Gravity discharge Fans Centrifugal Cooling towers Forced draft Induced draft without damper control Feeders Apron Belt Disc Reciprocating Screw Food industry Beet slicer Cereal cooker Dough mixer Meat grinders Bottling, can filling machine Generators (not welding) Hammer mills Laundry washers Reversing Laundry tumblers



M M H

2.50 1.50 2.50

M M M M M M

2.00 2.00 1.75 1.75 1.75 1.50

H H

2.75 2.75

M U M M M M M M M

1.75 1.50 2.25 2.25 1.75 1.75 1.75 1.75 1.50

M M M U

1.75 1.50 2.00 1.50

U M U M

1.00 2.00 1.50 2.00

U U U H U

1.25 1.25 1.25 2.50 1.25

M U M M U U M

1.75 1.25 1.75 1.75 1.00 1.00 2.00

M M

2.00 2.00 (continued)

3

AGMA 922--A96 Table 2 (continued) Application Lumber industry Barkers -- drum type Edger feed Live rolls Log haul -- incline Log haul -- well type Off bearing rolls Planer feed chains Planer floor chains Planer tilting hoist Slab conveyor Sorting table Trimmer feed



M M M M M M M M M M U M

2.00 2.00 2.00 2.00 2.00 2.00 1.75 1.75 1.75 1.50 1.50 1.75

M M M M

2.00 1.50 2.00 2.50

M U

1.50 1.25

M M M U

2.00 2.00 2.00 1.50

M H M M

2.25 2.50 2.00 1.75

Mills, rotary type Ball Cement kilns Dryers & coolers Kilns Pebble Rod Tumbling barrels

M M M M M M M

2.25 2.00 2.00 2.00 2.00 2.00 2.00

Mixers Concrete mixers Drum type

M M

1.75 1.50

Oil industry Chillers Oil well pumping Paraffin filter press Rotary kilns

U M M M

1.25 2.00 1.75 2.00

Paper mills Barker auxiliaries, hydraulic Barker, mechanical Barking drum (spur gear only) Beater & pulper

M M M M

2.00 2.00 2.25 1.75

Machine tools Bending roll Plate planer Punch press -- gear driven Tapping machines Other machine tools Main drives Auxiliary drives Metal mills Draw bench -- carriage Draw bench -- main drive Forming machines Slitters Table conveyors Non--reversing Reversing Wire drawing & flattening machine Wire winding machine

(continued) 4

AGMA 922--A96 Table 2 (continued) Application Paper mills (continued) Bleacher Calenders Converting machines, except cutters, platers Couch Cutters, platers Cylinders Dryers Felt stretcher Felt whipper Jordans Log haul Presses Reel Stock chests Suction roll Washers and thickeners Winders Printing presses Pullers Barge haul Pumps Centrifugal Reciprocating Double acting Single acting 1 or 2 cylinders 3 or more cylinders Rotary -- gear, lobe, vane Rubber industry Mixer -- Banbury Rubber calender Rubber mill (2 or more) Sheeter Tire building machines Tire & tube press openers Tubers and strainers Screens Air washing Rotary -- stone or gravel Travel water intake Sewage disposal equipment Bar screens Chemical feeders Collectors, circular or straight line Dewatering screens Grit collectors Scum breakers Slow or rapid mixers Sludge collectors Thickeners Vacuum filters



U M U M M M M U M M M M U U M U M M

1.00 2.00 1.50 1.75 2.00 1.75 1.75 1.25 2.00 1.75 2.00 2.00 1.50 1.50 1.75 1.50 1.50 1.50

M

2.00

U

1.00

M

2.00

M M U

2.25 1.75 1.50

M M M M M U M

2.50 2.00 2.25 2.00 2.50 1.00 2.00

U M U

1.00 1.50 1.25

U U U U U U U U U U

1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 1.25 (continued)

5

AGMA 922--A96 Table 2 (concluded) Application Steering gear Stokers Textile industry Batchers Calenders Card machines Cloth finishing machines (washers, pads, tenters) (dryers, calenders, etc.) Dry cans Dryers Dyeing machinery Looms Mangles Nappers Soapers Spinners Tenter frames Winders (other than batchers) Windlass

5 Service factors Normal service factor range for each load classification, table 1, is given as a range of values 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

Load classification (see 5.1 and table 1) U U

Typical service factor (see 5.2) 1.00 1.00

U M M

1.25 1.75 1.50

U M

1.50 1.75

M U M U U U M U M M

1.50 1.25 1.50 1.25 1.25 1.25 1.50 1.50 1.50 1.75

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.


PUBLISHED BY AMERICAN GEAR MANUFACTURERS ASSOCIATION 1500 KING STREET, ALEXANDRIA, VIRGINIA 22314

AGMA_922-A96

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