1、AN AMERICAN NATIONAL STANDARD ASME B29.21-2013Revision and Redesignation of ASME B29.21M-1996 (R2003)700 Class Chains, Attachments, and Sprocket Teeth for Water and Sewage Treatment PlantsASME B29.21-2013Revision and Redesignation of ASME B29.21M-1996 (R2003)700 Class Chains,Attachments, andSprocket
2、 Teeth forWater and SewageTreatment PlantsAN AMERICAN NATIONAL STANDARDTwo Park Avenue New York, NY 10016 USADate of Issuance: January 15, 2014This Standard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of
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12、l rights reservedPrinted in U.S.A.CONTENTSForeword ivCommittee Roster . vCorrespondence With the B29 Committee vi1 Nomenclature 12 Definitions 2Figures1 Cast Iron Chain With Chain Saver 42 Cast Iron Chain Without Chain Saver . 43 Welded Steel Chain With Chain Saver . 44 Welded Steel Chain Without Ch
13、ain Saver . 45 Stainless Steel Chain With Chain Saver 46 Nonmetallic Chain With Chain Saver . 47 Dimensions of Chains 58 Sprocket Tooth Form . 10Tables1 General Chain Dimensions, Ultimate Strengths, Proof Loads, Strand Length,and Chain Length Measuring Loads 62 Maximum and Minimum Controlling Dimens
14、ions for Interchangeable ChainLinks Cast and Welded Steel Chain Only 83 Chain Clearance Dimensions 94 F22-6 Attachment . 115 F22-8 Attachment . 126 A-42 Attachment . 137 F-2 Attachment . 148 K-2 Attachment 159 M-1 Attachment 1610 Pressure Angle, Pitch Diameter, and Clearance Circle 1711 Maximum Ecce
15、ntricity and Face Runout at Bottom Diameter 1712 Chain Saver Rim Diameters (Curved Sidebar Chains Only) 18Mandatory AppendixI Engineering Characteristics . 19iiiFOREWORDSince the development of this Standard in 1975 and the subsequent revisions published in 1981and 1996, it has been noted that withi
16、n the marketplace the use of chains made from plastics orstainless steels has become more prevalent. In most cases these chains are derivations of thetraditional “700 Class” cast iron or welded steel chains that were the basis of the original Standard.These new products offer system designers altern
17、atives in terms of strength, wear life, corrosionresistance, system weight, ease of maintenance, and cost.This revision incorporates the following product groups not found in previous editions of theStandard:Stainless steel fabricated chains (SS715 and SS709)Nonmetallic (plastic) chains (NM720)Sugge
18、stions for improvement of this Standard are welcome. They should be sent to the Secretary,B29 Committee, The American Society of Mechanical Engineers, Two Park Avenue, New York,NY 10016-5990.This revision was approved as an American National Standard on November 26, 2013.ivASME B29 COMMITTEEChains,
19、Attachments, and Sprocketsfor Power Transmission and Conveying(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSC. G. Springman, ChairC. J. Gomez, SecretarySTANDARDS COMMITTEE PERSONNELA. J. Binford, IWIS Drive SystemsR. Brandon, Alte
20、rnate, Diamond Chain Co.L. Carrier, ConsultantD. W. Egbert, Hitachi Maxco, Ltd.D. G. Fannin, Emerson Power TransmissionC. J. Gomez, The American Society of Mechanical EngineersW. C. Hall, Ramsey Products Corp.D. B. Holcomb, Alternate, Ramsey Products Corp.M. Manickam, Webster IndustriesC. A. Norwood
21、, Martin Sprocket however, they shouldnot contain proprietary names or information.Requests that are not in this format may be rewritten in the appropriate format by the Committeeprior to being answered, which may inadvertently change the intent of the original request.ASME procedures provide for re
22、consideration of any interpretation when or if additionalinformation that might affect an interpretation is available. Further, persons aggrieved by aninterpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not“approve,” “certify,” “rate,” or “endorse” any item, construc
23、tion, proprietary device, or activity.Attending Committee Meetings. The B29 Standards Committee regularly holds meetings thatare open to the public. Persons wishing to attend any meeting should contact the Secretary ofthe B29 Standards Committee.viASME B29.21-2013700 CLASS CHAINS, ATTACHMENTS, AND S
24、PROCKET TEETHFOR WATER AND SEWAGE TREATMENT PLANTS1 NOMENCLATURE1.1 Chain TypesCast iron chainsWelded steel chainsStainless steel fabricated chainsNonmetallic (plastic) chains1.1.1 Cast Iron Chains. Cast iron chains consist ofa series of identical offset links having barrels to contactthe sprocket t
25、eeth and pins that articulate in the barrelsof links. Radius curves in the sidebars (chain savers), ifpresent, operate on sprocket flanges known as chain-saver rims. The purpose of the chain saver is to provideadditional link support to reduce barrel O.D. wear. SeeFigs. 1 and 2.Pins are fixed in the
26、 sidebar pitch holes by mechanicallocks to prevent rotation in the sidebar pitch holes. Pincotters are stainless steel.Pin material is medium carbon steel or equivalent at302 BHN minimum. Cast links, including attachments,are pearlitic malleable iron ASTM A220 Grade 60004 orequivalent at 179 BHN min
27、imum.1.1.2 Welded Steel Chains. Welded steel chains con-sist of a series of identical offset links having barrelsfixed to the sidebars by welds. Radius curves in thesidebars (chain savers), if present, operate on sprocketflanges known as chain-saver rims. The purpose of thechain saver is to provide
28、additional link support toreduce barrel O.D. wear. See Figs. 3 and 4.Pins are fixed in the sidebar pitch holes by press fitsand mechanical locks to prevent rotation in the sidebarpitch holes. Pin cotters are stainless steel.Pin material is medium carbon steel or equivalent at302 BHN minimum. Barrels
29、 are medium carbon steel orequivalent at 229 BHN minimum. Sidebars and attach-ments are medium carbon steel at 229 BHN minimum.1.1.3 Stainless Steel Fabricated Chains. Stainlesssteel fabricated chains consist of a series of alternatinginside and outside links having barrels to contact thesprocket te
30、eth and pins that articulate in the barrels oflinks. Radius curves in the sidebars (chain savers) oper-ate on sprocket flanges known as chain-saver rims. Thepurpose of the chain saver is to provide additional linksupport to reduce barrel O.D. wear. See Fig. 5.1Pins and bushings are fixed in the side
31、bar pitch holesby press fit and mechanical locks to prevent rotation inthe sidebar pitch holes. Pin cotters are stainless steel.Pin, barrel, and sidebars are made from martensiticstainless steels with a minimum 11.5% chromium con-tent. Pins and barrels are heat treated for resistance toelongation an
32、d barrel wear.1.1.4 Nonmetallic (Plastic) Chains. Nonmetallic(plastic) chains consist of a series of identical offset linkshaving barrels to contact the sprocket teeth and pinsthat articulate in the barrels of links. Radius curves inthe sidebars (chain savers) operate on sprocket flangesknown as cha
33、in-saver rims. The purpose of the chainsaver is to provide additional link support to reducebarrel O.D. wear. See Fig. 6.Pins are fixed in the sidebar pitch holes by press fitand/or mechanical locks to prevent rotation in the side-bar pitch holes.Pins and links are made from a variety of plastic mat
34、e-rials and hardness levels, depending on the manufac-turer. The contour of the links and method of connectinglinks together are also unique to each manufacturer. Noattempt will be made in this Standard to distinguishperformance value of any particular design. Rather, onlythe dimensions necessary fo
35、r function on the standard720S tooth form, attachment bolt hole pattern, proofload, and measuring load will be established.1.2 Dimensions for Chain Links1.2.1 Cast and Welded Steel Chains. To assure inter-changeability of links and function over the standardtooth form as produced by different manufa
36、cturers ofchain, standard maximum and minimum dimensionsare adopted. They are not actual dimensions used inmanufacturing, but limiting dimensions required toassure desired interchangeability.The following dimensional data can be found in thisStandard for cast and welded steel chains:(a) general chai
37、n dimensions, ultimate strengths,proof loads, strand length, and measuring loads (seeTable 1 and Fig. 7)(b) maximum and minimum controlling dimensionsfor interchangeability (see Table 2 and Fig. 7)(c) the required maximum clearance dimensions (seeTable 3 and Fig. 7)ASME B29.21-2013(d) dimensions for
38、 the F22-6 attachment (see Table 4)(e) dimensions for the F22-8 attachment (see Table 5)(f) dimensions for the A-42 attachment (see Table 6)(g) dimensions for the F-2 attachment (see Table 7)(h) dimensions for the K-2 attachment (see Table 8)(i) dimensions for the M-1 attachment (see Table 9)(j) dim
39、ensions for the pressure angle, pitch diameter,and clearance circle of the sprocket (see Table 10)(k) dimensions for the maximum eccentricity and facerunout of the bottom diameter of the sprocket (seeTable 11)(l) dimensions for the chain saver rim diameter of thesprocket (see Table 12)All dimensions
40、 are given in U.S. Customary units inaccordance with ANSI B87.1-1965. The Metric equivalentdimensions are given for reference only, perANSI Z210.1-1976.1.2.2 Stainless Steel and Nonmetallic Chains. ThisStandard does not allow for the interchangeability ofindividual links of stainless steel fabricate
41、d or nonmetal-lic (plastic) chains. However, it does provide the mini-mum and maximum dimensions necessary to assure fiton a standard sprocket tooth form and a standard bolt-hole pattern for the attachments.The following dimensional data can be found in thisStandard for stainless steel and nonmetall
42、ic (plastic)chains:(a) general chain dimensions, ultimate strengths,proof loads, strand length, and measuring loads (seeTable 1)(b) the required maximum clearance dimensions (seeTable 3)(c) dimensions for the F22-6 attachment (see Table 4)(d) dimensions for the F22-8 attachment (see Table 5)(e) dime
43、nsions for the pressure angle, pitch diameter,and clearance circle of the sprocket (see Table 10)(f) dimensions for the maximum eccentricity and facerunout of the bottom diameter of the sprocket (seeTable 11)(g) dimensions for the chain saver rim diameter ofthe sprocket (see Table 12)All dimensions
44、are given in U.S. Customary units inaccordance with ANSI B87.1-1965. The Metric equivalentdimensions are given for reference only, perANSI Z210.1-1976.2 DEFINITIONS2.1 Minimum Ultimate StrengthThe minimum ultimate strength (MUS) is a factoredstatistical value for standards that does not necessarilyr
45、eflect the typical ultimate strength of the chain. Individ-ual manufacturers should be contacted for the individ-ual ultimate strength value of their chains.2CAUTION: This load is beyond the yield strength of the chainandwouldrenderthechainunsuitableforoperation.Forapplica-tion guidance and allowabl
46、e working loads, consult the chainmanufacturer.2.2 Working Load Capacities of ChainsFor working load capacities of each chain, the chainmanufacturer should be consulted.2.3 Proof Loads2.3.1 Proof Load for Cast Chains. Nondestructiveproof-load testing for each strand of cast chain is toassure that th
47、e chain is free of harmful casting defectsand gives the user assurance that the chain meets therequirements of this Standard. The value of the proofload is shown in Table 1. It is expected that the proofload is greater than the expected working load of thechain in service.2.3.2 Proof Load for Nonmet
48、allic (Plastic) Chains.Nondestructive proof-load testing for each strand ofnonmetallic (plastic) chain is to assure that the chain isfree of harmful defects from injection molding. The valueof the proof load is shown in Table 1. It is expected thatthe proof load is greater than the expected working
49、loadof the chain in service.2.3.3 Proof Load for Welded Steel Chains. Proof-load testing is not a requirement of this Standard forwelded steel type chains, since the components of thesetypes of chains are not subject to the potential defectsfrom the casting or injection-molding processes.2.3.4 Proof Load for Stainless Steel FabricatedChains. Proof-load testing is not a requirement of thisStandard for stainless steel fabricated chains, since thecomponents of these types of chains are not subject to thepotential defects from the casting or injection-moldingprocesses.2.4 Strand-Leng
