1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 746-8:2000 The Euro
2、pean Standard EN 746-8:2000 has the status of a British Standard ICS 25.180.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Industrial thermoprocessing equipment Part 8: Particular safety requirements for quenching equipmentThis British Standard, having been prepared under
3、the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 November 2000 BSI 11-2000 ISBN 0 580 35980 8 BS EN 746-8:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard
4、 is the official English language version of EN 746-8:2000. The UK participation in its preparation was entrusted by Technical Committee MCE/3, Safeguarding of machinery, to Subcommittee MCE/3/8, Thermoprocessing equipment - Safety, which has the responsibility to: aid enquirers to understand the te
5、xt; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be o
6、btained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find
7、” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal
8、obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 35 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN7468 Septemb
9、er2000 ICS25.180.01 Englishversion IndustrialthermoprocessingequipmentPart8:Particularsafety requirementsforquenchingequipment EquipementsthermiquesindustrielsPartie8: Prescriptionsparticuliresdescuritpourles quipementsdetrempe IndustrielleThermoprozeanlagenTeil8:Besondere Sicherheitsanforderungenan
10、Abschreckanlagen ThisEuropeanStandardwasapprovedbyCENon22November1999. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnat
11、ional standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestat
12、usast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISAT
13、ION EUROPISCHESKOMITEEFRNORMUNG CentralSecretariat:ruedeStassart,36B1050Brussels 2000CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN7468:2000EPage2 EN7468:2000 Contents Page FOREWORD 3 0 INTRODUCTION 4 1S C O P E 4 2 NORMATIVEREFERENCES 4 3 DEFINIT
14、IONS 6 3.1 EnclosedChamber 6 3.2 QuenchingMedia 6 3.3 FloodQuench 6 3.4 OpenQuench 6 3.5 PressQuench 6 3.6 SmallTank 6 3.7 MediumTank 6 3.8 LargeTank 7 3.9 ClosedTank 7 4 LISTOFHAZARDS 7 5 SAFETYREQUIREMENTSAND/ORMEASURES 11 5.1 General 11 5.2 Layout 12 5.3 DesignandConstructionofQuenchTanks 12 5.4
15、ExhaustandVentilationSystems 14 5.5 CoolingSystems(whereprovided) 15 5.6 TracingandJacketing 16 5.7 HeatingSystems 17 5.8 ComponentHandling 17 5.9 ControlsandAlarms 20 5.10 QuenchantLevelandEffectiveDepth 21 5.11 Plant/EquipmentDetails 23 5.12 FirePrecautionaryArrangements 25 5.13 ErgonomicRequireme
16、nts 27 6 VERIFICATIONOFSAFETYREQUIREMENTSAND/ORMEASURES 27 7 INFORMATIONFORUSE 28 7.1 General 28 7.2 SpecificInformationToBeProvided 28 7.3 Markingofquenchequipment 29 7.4 Usersinformation 30 7.5 Care 30 7.6 Maintenanceoftheequipment 30 ANNEXA(INFORMATIVE)Examplesofquenchingequipment 32 ANNEXZA(INFO
17、RMATIVE)ClausesofthisEuropeanStandardaddressing essentialrequirementsorotherprovisionsofEUDirectives. 35Page3 EN7468:2000 FOREWORD ThisEuropeanStandardhasbeenpreparedbyTechnicalCommitteeCEN/TC186“Industrial thermoprocessingSafety“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhe
18、statusofanationalstandard,eitherbypublication ofanidenticaltextorbyendorsement,atthelatestbyMarch2001,andconflictingnational standardsshallbewithdrawnatthelatestbyMarch2001. ThisEuropeanStandardhasbeenpreparedunderamandategiventoCENbytheEuropean CommissionandtheEuropeanFreeTradeAssociation,andsuppor
19、tsessentialrequirementsof EUDirective(s). ForrelationshipwithEUDirective(s),seeinformativeAnnexZA,whichisanintegralpartof thisstandard. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizations ofthefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium, Czech
20、Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy, Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnited Kingdom. TheworkinggroupthatdraftedthisPartofEN746comprisedexpertsfromthefollowing countries:France,Germany,Italy,SwedenandUnitedKingdom. Thisstandardform
21、sonepartofaseriessafetystandardscoveringIndustrial ThermoprocessingEquipment. ThefulllistofpartsofEN746isgivenbelow: EN746 IndustrialThermoprocessingEquipment Part1: CommonSafetyRequirementsforIndustrialThermoprocessing Equipment Part2: SafetyRequirementsforCombustionandFuelHandlingSystems Part3: Sa
22、fetyRequirementsfortheGenerationandUseofAtmospheregases Part4: ParticularSafetyRequirementsforHotDipGalvanising ThermoprocessingEquipment Part5: ParticularSafetyRequirementsforSaltBathThermoprocessing Equipment Part6: ParticularSafetyRequirementsforMaterialMelting,Remeltingand LiquidPhaseMaintaining
23、ThermoprocessingEquipment Part7: ParticularSafetyRequirementsforVacuumThermoprocessing Equipment. Part8: ParticularSafetyRequirementsforQuenchingEquipmentPage4 EN7468:2000 Anassessmentoftheforeseeablerisksarisingfromtheuseoftheequipmentwascarriedout whenthisstandardwasprepared. TheannexesAandZAarein
24、formative. 0 INTRODUCTION TheEN7461GeneralSafetyRequirementscontainsthecommonsafetyprovisionsand devicesforalltypesofindustrialthermoprocessingequipment.Thispartofthestandard detailsinadditionthoseextrasafetyrequirementswhichneedspecialattentionagainst quenchingequipment. ThisEuropeanStandardisatype
25、CstandardasdefinedinEN292:1991. Theextenttowhichhazardsarecoveredisindicatedinthescopeofthisstandard. 1S C O P E ThispartofEN746givesthespecifichazardsandsafetyrequirementsthatshallbeprovided bythemanufacturerforQuenchingEquipment,whetheritisusedasanindependentunitoran integratedpartofaplant. Thispa
26、rtofEN746doesnotcoverspecifichazardsandsafetyrequirementsforSaltBathbath equipmentusedasaquenchingmeans(seeEN7465:2000). ThispartofEN746doesnotcoverthehandling,storage,transport,disposal,transferor regenerationofthequenchingmediaandprocessedmaterialoutsidethelimitsofthe equipment. ThispartofEN746sta
27、ndardappliesnotonlytothenormaloperationoftheequipmentbut alsotothesafetyofpersonnelandpropertywhenforeseeablefaultsoccurinthem. ExamplesofquenchingequipmentareshowninFig.1andFig.2. NOTE: Therearemanyvariationsinthedesignofquenchingequipment.Onlytwo examplesofthevarioustypesaregiveninthistext. 2 NORM
28、ATIVEREFERENCES ThisEuropeanStandardincorporatesbydatedorundatedreferences,provisionsfromother publications.Thesenormativereferencesarecitedattheappropriateplacesinthetextandthe publicationsarelistedhereafter.Fordatedreferences,subsequentamendmentstoorrevisions ofanyofthesepublicationsapplytothisEur
29、opeanStandardonlywhenincorporatedinitby amendmentorrevision.Forundatedreferencesthelatesteditionofthepublicationreferredto applies. EN166 PersonaleyeprotectionSpecificationsPage5 EN7468:2000 EN2921:1991 SafetyofmachineryBasicconcepts,generalprinciplesfordesign Part1: Basicterminology,methodology EN2
30、922:1991 SafetyofmachineryBasicconcepts,generalprinciplesfordesign Part2: Technicalprinciplesandspecifications EN345 Specificationforsafetyfootwearforprofessionaluse EN346 Specificationforprotectivefootwearforprofessionaluse EN469 ProtectiveclothingforfirefightersRequirementsandtestmethods forprotec
31、tiveclothingforfirefighting EN531 Protectiveclothingforindustrialworkersexposedtoheat(excluding firefightersandweldersclothing) EN6141 SafetyofmachineryErgonomicdesignprinciples Part1: Terminologyandgeneralprinciples EN7461:1997 IndustrialThermoprocessingEquipment Part1: CommonSafetyRequirementsforI
32、ndustrial ThermoprocessingEquipment EN7462:1997 IndustrialThermoprocessingEquipment Part2: SafetyRequirementsforCombustionandFuelHandling Systems EN7463:1997 IndustrialThermoprocessingEquipment Part3: SafetyRequirementsfortheGenerationandUseof AtmosphereGases EN7465:2000 IndustrialThermoprocessingEq
33、uipment Part5: ParticularSafetyRequirementsforSaltBath ThermoprocessingEquipment EN7468:2000 IndustrialThermoprocessingEquipment Part8: ParticularSafetyRequirementsforQuenchingEquipment prEN10052:1998 SafetyofmachineryHumanphysicalperformance Part2: Manualhandlingofmachineryandcomponentpartsof machi
34、nery prEN10053:1998 SafetyofmachineryHumanphysicalperformance Part3: Recommendedforcelimitsformachineryoperation EN1070 SafetyofmachineryTerminologyPage6 EN7468:2000 EN602041:1997 SafetyofmachineryElectricalequipmentofmachines Part1: Generalrequirements(IEC602041:1997) EN613101 SafetyofmachineryIndi
35、cation,markingandactuation Part1: Requirementsforvisual,auditoryandtacticlesignals (IEC613101:1995) 3 DEFINITIONS ForthepurposesofthisstandardthedefinitionsgiveninEN1070apply. Additionaldefinitionsspecificallyneededforthisstandardareaddedbelow: 3.1 EnclosedChamber Achamberusedforquenchingwithagasorg
36、asesatlowatmosphericorpositivepressures. 3.2 QuenchingMedia Thefluidusedasthecoolanttoextractheatfromthecomponentsbeingprocessed,suchas oils,water/oilemulsions,saltsolutions,moltenlead,polymers,steam(watervapour)and fluidisedbeds. 3.3 FloodQuench Aquenchingprocesswherealiquidquenchantispumpedorflows
37、bygravityoverthesurface oftheparttobetreated. 3.4 OpenQuench Componentsenterthequenchmediumincontactwiththeatmospherecontainedinafully opentank. 3.5 PressQuench Aquenchingprocesscarriedoutinspeciallydesignedmachinesinwhichthehotcomponent islocatedbetweendiesunderpressureandheldinpositionwhilethequen
38、chantflowsoverit. 3.6 SmallTank Acontaineroflessthan1000lcapacityandwithasurfacearea(openorcovered)oflessthan 1m 2 . 3.7 MediumTank Acontainerofbetween1000land3000lcapacityandwithasurfacearea(openorcovered) ofnotmorethan2m 2 .Page7 EN7468:2000 3.8 LargeTank Acontainerofmorethan3000lcapacityandasurfa
39、cearea(openorcovered)ofmorethan 2m 2 . 3.9 ClosedTank Acontainerinwhichthequenchantsurfaceiscoveredortotallyblanketedbyagasorgases thatexcludeairorwheretheemptyspaceisevacuated. 4 LISTOFHAZARDS Anassessmentoftheforeseeablerisksarisingfromtheuseoftheindustrialthermoprocessing equipmenthasbeencarriedo
40、utwhenthisstandardwaselaborated. Theclausehasbeencondensedintoatable(seetable1).Itsummarisesthoseareaswhich requireconsiderationbythemanufacturer.Foreaseofreferencethetableindicatestheneed forsafetyfeaturesorinstructionsincolumns.Thetableshallonlybeusedinconjunctionwith clauses5and7wherefurtherdetai
41、lisgiven. Table1showstheHazard,HazardousSituation,PreventativeMeasuresandtheVerification Means(aspointedoutinclause6)identifiedfortheequipmenttypedescribedinthispartto thisstandard.Page8 EN7468:2000 Table1: ListofHazards,HazardousSituationsandPreventativeMeasures 1 Item 2 Hazard 3 Hazardoussituation
42、s 4 Preventativemeasures 5 References 6 Verifi cation means *) 1 MECHANICAL 1.1 Crushing, Shearing, Entangle ment Mechanicalhandlingsystem: lifts overheadhoists quenchelevators continuousquenching seeEN7461 EN7461:1997 Table1;2.2 Table1;2.3 Table1;2.4 EN7468:2000 5.8.1 5.8.2 5.8.3 1and2 2 EQUIPMENTU
43、SINGQUENCHINGOIL 1 Designtominimiseejection EN7461:1997 5.11 1and2 2 Maintenanceinstructions 1 3 Pumpingfacilities 1and2 4 Indicatemax.permissible watercontentinoil 1 2.1 Thermal Ejectionofhotmaterialcausing burns/scalds Wateringressfoaming Vacuumdegassing Corrosionofbath,pipes,overflows 5 Provision
44、ofinstructionsto checkwatercontentinthe oil 1 2.2 Fireand explosion Ignitionofbatchcontentsinsideor outsidebatch Oil/waterexplosion(s) 1 Useaquenchingmedium, whoseflashpointisabove themaximumworking temperatureofthetank (Temperatureafter quenchingofthepart) 1and2 2 Designthetanksothatthe immersionofapartdoesnot leadtothemaximum authorizedtemperature beingexceeded.The manufacturershallindicate totheuserthemaximum loadcharacteristic(e.g. weight,volume) 1and2 3 Avoiduseofdirectaqueous cooling 5.5 5.5.2
