1、BRITISH STANDARD BS EN 818-2:Short link chain for lifting purposes Safety Part 2: Medium tolerance chain for chain slings Grade 8ICS 53.020.30nullnull nullnullnullnullnullnullnull nullnullnullnullnullnullnull nullnullnull nullnullnullnullnullnullnullnullnullnull nullnullnullnullnullnull nullnull nul
2、lnullnullnullnullnullnullnullnull nullnull nullnullnullnullnullnullnullnullnull nullnullnull1996+A1:2008BS EN 818-2:1996+A1:2008This British Standard was published under the authority of the Standards Board and comes into effect on 15 April 1997 BSI 2008ISBN 978 0580 64140 4National forewordThis Bri
3、tish Standard is the UK implementationofEN 818-2:1996+A1:2008. Itsupersedes BS EN 818-2:1996 which is withdrawn.The start and finish of textintroduced or altered by amendment is indicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, tex
4、t altered by CEN amendment A1 isindicated by!“.The UK participation in its preparation was entrusted to Technical Committee MHE/1, Chains and fittings.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all th
5、e necessary provisionsof a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate Comments30 November 2008 Implementation of CEN amendment A1:2008, andalignment o
6、f BSI and CEN publication datesEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORMEN 818-2:1996+A1April 2008 ICS 53.020.30Supersedes EN 818-2:1996 English Version Short link chain for lifting purposes - Safety - Part 2: Medium tolerance chain for chain slings - Grade 8 Chanes de levage maillons courts
7、 - Scurit - Partie 2:Chane de tolrance moyenne pour lingues en chanes - Classe 8Kurzgliedrige Rundstahlketten fr Hebezwecke - Sicherheit-Teil 2: Mitteltolerierte Rundstahlketten fr Anschlagketten - Gteklasse 8This European Standard was approved by CEN on 7 March 1996 and includes Amendment 1 approve
8、d by CEN on 10 February 2008.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalst
9、andards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified
10、 to the CEN Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, N
11、etherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitatio
12、n in any form and by any means reserved worldwide for CEN national Members.Ref. No. EN 818-2:1996+A1:2008: EEN 818-2:1996+A1:2008 (E)2 Contents PageForeword3Introduction.41Scope52Normative references53 ! Terms and definitions“ .54Hazards.65Safety requirements 65.1General65.2Dimensions.65.2.1 Nominal
13、 size of chain, dn 65.2.2Tolerance on material diameter (except at the weld).65.2.3Weld diameter75.2.4 Length dimensionally affected by welding.75.2.5 Pitch and widths 75.3 Materials and heat treatment85.3.1 Quality of material85.3.2 Heat treatment95.4 Mechanical properties.95.4.1Manufacturing proof
14、 force (MPF).95.4.2 Breaking force (BF) and total ultimate elongation (A).95.4.3 Bend deflection96Verification of safety requirements106.1 ! Qualification of personnel.106.2 Size of lot and selection of samples106.3Manufacturing proof force, breaking force and total ultimate elongation.106.3.1 Stati
15、c tensile test .106.3.2 Manufacturing proof force acceptance criteria116.3.3 Breaking force and total ultimate elongation acceptance criteria116.4 Bend deflection116.4.1 Bend test.116.4.2 Bend deflection acceptance criteria117Marking.118Manufacturers certificate.119 ! Information“ for use .11Annex A
16、 (informative) Calculation of dimensions, working load limits and mechanical properties .13A.1Dimensions and tolerances13A.2Working load limits and mechanical properties.13Annex B (informative) Weight of chain .15Annex C (informative) Designation system for chain (medium tolerance) - grade 8.16Annex
17、 ZA (informative) ! Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC17Annex ZB (informative) Relationship between this European Standard and the EssentialRequirements of EU Directive 2006/42/EC18! Bibliography.19BS EN 818-2:1996+A1:2008EN 818-2:1996
18、+A1:2008 (E)3 Foreword This document (EN 818-2:1996+A1:2008) has been prepared by Technical Committee CEN/TC168 “Chains,ropes, webbing, slings and accessories - Safety”,the secretariat of which is held byBSI. This European Standard shall be given the status of a national standard, either by publicat
19、ion of an identical text or by endorsement, at the latestby October 2008 and conflicting national standards shall be withdrawn at the latest byOctober2008.This document includes Amendment 1, approved byCEN on 2008-02-10. This document supersedes EN 818-2:1996. The start and finish of textintroduced
20、or altered by amendment is indicated in the text by tags!“. ! This document has been prepared under a mandate given to CEN bythe European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative
21、 Annexes ZA and ZB, which are integral parts of this document.“The other parts of EN 818 are: Part 1: General conditions of acceptance Part 3: Medium tolerance chain for chain slings - Grade 4 Part 4: Chain slings - Grade 8 Part 5: Chain slings - Grade 4 ! Part 6: Chain slings - Specification for in
22、formation for use and maintenance to be provided by the manufacturer“ ! Part 7: Fine tolerance hoist chain, Grade T (Types T, DAT and DT)“A further part or parts will cover fine tolerance chains for chain hoists and other lifting appliances. According to the CEN/CENELEC Internal Regulations, the nat
23、ional standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, CzechRepublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,Lithuania, Luxembourg, Malta, Netherlands, Norway, Po
24、land, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 818-2:1996+A1:2008EN 818-2:1996+A1:2008 (E)4 Introduction This European Standard has been prepared to be a harmonized standard to provide one means of conforming with the essential safety requirements o
25、f the MachineryDirective. This Directive stipulates thatwhere chainwith welded links is used for lifting accessories it is to be of short linktype and for the purposes of this standard this is chain having a ratio of nominal pitch to nominal size of 3:1. The extent to which hazards are covered is in
26、dicated in the scope of this Part of EN 818. In addition, liftingequipment shall comply as appropriate with ! EN ISO 12100“ for hazards which are not covered by thisstandard. Annex C gives a designation system for recording the identifying features of grade 8 short link chain. Since this system is n
27、ot widely used it has been included in this first edition of this standard as an informative annex,however, should its use become more generally accepted then the status of the information would need to bereviewed. ! This standard is a Type C standard as stated in EN ISO 12100. When provisions of th
28、is type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for equipment that have been designed and build according to the provisions of this type C standard.“BS EN 818-2:1
29、996+A1:2008EN 818-2:1996+A1:2008 (E)5 1 Scope ! This part of EN 818 specifies the requirements related to safety for short link chains, grade 8, of mediumtolerance for use in chain slings accor ding to ! EN 818-4:1996+A1“ and for general lifting purposes.“They are electrically welded round steel sho
30、rt link chains, heat treated and tested and complying with the general conditions of acceptance in ! EN 818-1:1996+A1“ . The range of nominal sizes of chain covered by this Part of EN 818 is from 4 mmto 45 mm. The hazards covered by this Part of EN 818 are identified in clause 4. The bases for calcu
31、lation of tabulated values for dimensions, working load limits and mechanical propertiesare given in annex A. Annex B gives information on weight/metre of chain. Annex C gives an example of a designation system forchains. 2 NormativereferencesThis European Standard incorporates bydated or undated re
32、ference provisions from other publications.These normative references are cited at the appropriate places in the text and the publications are listedhereafter. For dated references, subsequent revisions to or amendments of anyof these publications applytothis European Standard only when incorporated
33、 in it by amendment or revision. For undated references, thelatestedition of the publication referred to applies.! deleted text“! EN 818-1:1996+A1“ , Short link chain for lifting purposes Safety Part 1: General conditions of acceptance ! EN 818-6:2000+A1“ , Short link chain for lifting purposes Safe
34、ty Part6: Chain slings Instructions foruse and maintenance ! EN 1050“ , Safety ofmachinery Risk assessment! EN ISO 12100-1, Safety of machinery - Basic concepts,general principles for design - Part 1: Basic terminology, methodology (ISO 12100-1:2003)EN ISO 12100-2, Safety of machinery -Basic concept
35、s,general principlesfor design - Part 2: Technical principles (ISO 12100-2:2003)“ISO 643, Steels Micrographic determination of the ferritic or austenitic grain size.3 ! Terms and definitions“! For the purposes of this document, the terms, definitions and symbols given in EN 818-1:1996+A1 and the fol
36、lowing apply.“BS EN 818-2:1996+A1:2008EN 818-2:1996+A1:2008 (E)6 4 Hazards ! Accidental release of a load, or release of a load d ue to“ failure of lifting accessories such as slings ortheir component parts puts at risk either directly or indirectly the ! safety orhealth“ or health of those persons
37、within the danger zone of lifting equipment. In order to provide the necessary strength and durabilityof lifting accessories this Partof EN 818 lays downrequirements for the design, selection ofmaterials of construction and testing to ensure that specified levels of performance are met. Fatigue fail
38、ure has not been identified as a ha zard when chain having the specified levels of performance given in this Part of EN 818isused in general lifting service. Since failure can be caused bythe incorrect choice of grade and specification of lifting accessories this Part ofEN 818 also gives the require
39、mentsformarking and the manufacturers certificate. Those aspects of safe use associated with good practice are given in ! EN 818-6:2000+A1“ . Table 1 contains ! all those hazards“ , which require action to reduce risk identified by risk assessment asbeing specific and significant for short link chai
40、n (medium tolerance) grade 8 for lifting purposes.Table 1 Hazards and associated requirements Hazards identified in annex A of ! EN 1050 “ Relevant clause/sub-clause of this standard ! 1 e)“ Mechanical hazard due to inadequacy ofstrength ! deleted text“5 6 7 5 Safetyrequirements 5.1 General The chai
41、n shall also complywith the appropriate requirements of ! EN 818-1:1996+A1“ . 5.2 Dimensions 5.2.1 Nominal size of chain, dnThe nominal size of chain shall be one of the sizes listed in table 2 column 1. 5.2.2Tolerance on material diameter (except at the weld)The tolerance on materialdiameter for ea
42、ch nominal size of chain shall be in accordance with table 2 column2. BS EN 818-2:1996+A1:2008EN 818-2:1996+A1:2008 (E)7 5.2.3 WelddiameterThe maximum diameter at the weld for each nominal size of chain shall be in accordance with table 2 column3. The thickness of the steel at the weld shall nowhere
43、 be less than the actualdiameter of the steel adjacent to the weld. 5.2.4Length dimensionally affected by welding The length dimensionallyaffected by welding (e) shall not extend by more than 0,6 dn to either side of thecentre of the link. 5.2.5Pitch and widthsThe dimensions of the pitch and widths
44、of the individual links and chain shall be as specified in table 2 columns 4 to 8, and illustrated in figure 1 of! EN 818-1:1996+A1“ . Table 2 DimensionsDimensions in millimetres(1) (2) (3) (4) (5) (6) (7) (8) Pitch Nominal Size d nMaterialdiametertolerance Welddiameterd s maxp n p maxp minInternalw
45、idth awayfrom weldw 1minExternalwidth overthe weld W 2max4 5 6 7 8 10 13 16 18 19 20 22 23 25 26 28 32 36 40 45 + 0,16 + 0,2 + 0,24 + 0,28 + 0,32 + 0,4 + 0,52 + 0,64 + 0,9 + 1 + 1 + 1,1 + 1,2 + 1,3 + 1,3 + 1,4 + 1,6 + 1,8 + 2 + 2,3 4,4 5,5 6,6 7,7 8,8 11 14,3 17,6 19,8 20,9 22 24,2 25,3 27,5 28,6 30
46、,8 35,2 39,6 44 49,5 12 15 18 21 24 30 39 48 54 57 60 66 69 75 78 84 96 108 120 135 12,4 15,5 18,5 21,6 24,7 30,9 40,2 49,4 55,6 58,7 61,8 68 71,1 77,3 80,3 86,5 98,9 111 124 139 11,6 14,6 17,5 20,4 23,3 29,1 37,8 46,6 52,4 55,3 58,2 64 66,9 72,8 75,7 81,5 93,1 105 116 131 5,2 6,5 7,8 9,1 10,4 13 16
47、,9 20,8 23,4 24,7 26 28,6 29,9 32,5 33,8 36,4 41,6 46,8 52 58,5 14,8 18,5 22,2 25,9 29,6 37 48,1 59,2 66,6 70,3 74 81,4 85,1 92,5 96,2 104 118 133 148 167 BS EN 818-2:1996+A1:2008EN 818-2:1996+A1:2008 (E)8 5.3Materials and heat treatment5.3.1 Quality of material 5.3.1.1 General Within the limitation
48、sgiven in 5.3.1.2 to 5.3.1.4 it is the responsibilityof the chain manufacturer to select the type of steel to be used so that the finished chain, when suitablyheat-treated meets the mechanical propertiesspecified in this Part of EN 818. 5.3.1.2Type of steel The steel used shall be produced byan elec
49、tric process or byan oxygen blown process.5.3.1.3 DeoxidationThe steel shall be fully killed, be stabilized against strain age embrittlement and have an austenitic grain sizeof 5 or finer when tested in accordance with ISO 643. 5.3.1.4 Chemical compositionThe steel shall contain alloying elements in sufficient quantities so that the finished chain, when heat treated inaccordance with 5.3.2, complies not onlywith the mechanical properties specified in this Partof EN 818 but also possesses adequate low temperature ductility and toughness to provide
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