EN 12952-10-2002 en Water-tube boilers and auxiliary installations - Part 10 Requirements for safeguards against excessive pressure《水管锅炉及附属设备 第10部分 防止过压安全保护要求》.pdf

1、BRITISH STANDARD BS EN 12952-10:2002 Water-tube boilers and auxiliary installations Part 10: Requirements for safeguards against excessive pressure ICS 23.060.40; 27.040; 27.060.30 Incorporating corrigendum January 2010National foreword This British Standard is the UK implementation of EN 12952-10:2

2、002. Together with BS EN 12952-1:2001, BS EN 12952-2:2001, BS EN 12952-3:2001, BS EN 12952-5:2001, BS EN 12952-6:2002, BS EN 12952-7:2002 and BS EN 12952-11:2007, it supersedes BS 1113:1999 which remains current and obsolescent. The obsolescent status means that the standard will no longer be update

3、d. This status is given to BS 1113:1999 on the basis that there are numer- ous boilers throughout the world with long expectations of life that will require use of this standard for service and repair, enabling justification of continued service of the boilers. The UK participation in its preparatio

4、n was entrusted to Technical Committee PVE/2, Water-tube and shell boilers. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correc

5、t application. Compliance with a British Standard cannot confer immunity from legal obligations. BS EN 12952-10:2002 This British Standard, having been prepared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and

6、Strategy Committee on 8 October 2002 BSI 2010 Amendments/corrigenda issued since publication Date Comments 31 January 2010 Supersession details updated in National foreword ISBN 978 0 580 69569 8EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN1295210 September2002 ICS23.060.40;27.040 Englishversion

7、 WatertubeboilersandauxiliaryinstallationsPart10: Requirementsforsafeguardsagainstexcessivepressure ChaudirestubesdeauetinstallationsauxiliairesPartie 10:Exigencespourlaprotectionvisvisdesexcsde pression WasserrohrkesselundAnlagenkomponentenTeil10: AnforderungenanSicherheitseinrichtungengegen Druckb

8、erschreitung ThisEuropeanStandardwasapprovedbyCENon22March2002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropean Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcerningsuchnational sta

9、ndardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytranslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusastheofficia

10、l versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION

11、 EUROPISCHES KOMITEE FR NORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.EN1295210:2002E2 Contents 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions4 4 Symbolsandabbreviations 4 5 Require

12、ments .5 5.1 Steamboiler5 5.2 Hotwatergenerator .8 AnnexZA (informative) ClausesofthisEuropeanStandardaddressingessentialsafetyrequirementsor otherprovisionsofPressureEquipmentDirective10 Bibliography 11 BS EN 12952-10:2002 EN 12952-10:2002 (E)3 Foreword This document (EN 1295210:2002) has been prep

13、ared by Technical Committee CEN/TC 269 “Shell and wa tertubeboilers“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextor byendorsement,atthelatestbyMarch2003,andconflictingnationalstandardsshallbewithdrawnatthelatestby

14、 March2003. ThisdocumenthasbeenpreparedunderamandategiventoCENbytheEuropeanCommissionandtheEuropean FreeTradeAssociation,andsupportsessentialrequirementsofEUDirective(s). ForrelationshipwithEUDirective(s),seeinformativeannexZA,whichisanintegralpartofthisdocument. TheEuropeanStandardEN12952concerning

15、watertubeboilersandauxiliaryinstallationsconsistsofthefollowing parts: Part1:General. Part2:Materialsforpressurepartsofboilersandaccessories. Part3:Designandcalculationforpressureparts. Part4:Inserviceboilerlifeexpectancycalculations. Part5:Workmanshipandconstructionofpressurepartsoftheboiler. Part6

16、:Inspectionduringconstruction,documentationandmarkingofpressurepartsoftheboiler. Part7:Requirementsforequipmentfortheboiler. Part8:Requirementsforfiringsystemsforliquidandgaseousfuelsfortheboiler. Part9:Requirementsforfiringsystemsforpulverizedsolidfuelsfortheboiler. Part10:Requirementsforsafeguards

17、againstexcessivepressure. Part11:Requirementsforlimitingdevicesoftheboilerandaccessories. Part12:Requirementsforboilerfeedwaterandboilerwaterquality. Part13:Requirementsforfluegascleaningsystems. Part14:RequirementsforfluegasDENOXsystems. Part15:Acceptancetests. Part16:Requirementsforgrateandfluidiz

18、edbedfiringsystemsforsolidfuelsfortheboiler. CR12952Part17:Guidelinefortheinvolvementofaninspectionbodyindependentofthemanufacturer. AlthoughthesePartscanbeobtainedseparately,itshouldberecognizedthatthePartsareinterdependent.As such,thedesignandmanufactureofwatertubeboilersrequirestheapplicationofmo

19、rethanonePartinorderfor therequirementsofthestandardtobesatisfactorilyfulfilled. NOTE Parts4and15arenotapplicableduringthedesign,constructionandinstallationstages. AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowingcoun tries are bound to implement this Europ

20、ean Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Swe den,SwitzerlandandtheUnitedKingdom. BS EN 12952-10:2002 EN 12952-10:2002 (E)4 1 Scope This Part of this European Standard specifies the

21、 requirements for safeguards against excessive pressure in watertubeboilersasdefinedinEN129521. 2 Normativereferences This European Standard incorporates, by dated or undated reference, provisions from other publications. These normativereferencesarecitedattheappropriateplacesinthetextandthepublicat

22、ionsarelistedhereafter.Fordated references,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropeanStandardonly when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referredtoapplies(includingamendments). prEN12681, Safet

23、ydevicesfortheprotectionagainstexcessivepressurePart1:Safetyvalves . prEN12685, Safetydevicesfortheprotection againstexcessive pressurePart5:Controlled safety pressure reliefsystems(CSPRS)Generalrequirements . EN129521:2002, WatertubeboilersandauxiliaryinstallationsPart1:General. prENISO41264, Safet

24、ydevicesforprotectionagainstexcessivepressurePart4:Pilotoperatedsafetyvalves (ISO/DIS41264:1999). 3 Termsanddefinitions ForthepurposesofthisEuropeanStandardthetermsanddefinitionsgiveninEN129521apply. 4 Symbolsandabbreviations ForthepurposesofthispartofthisEuropeanStandard,thesymbolsgiveninEN129521:2

25、002,Table41shallapply. Throughout this part of this European Standard, additional terminology and symbols have been included where necessarytomeettherequirementsofthespecifictextconcerned(seeTable41andFigure41). Table41Symbolsandunits Symbol explanation unit D E inletpipeinternaldiameter mm d 0 smal

26、lestflowdiameter(minimumfreebore) mm L E developedlengthofinletpipe mm BS EN 12952-10:2002 EN 12952-10:2002 (E)5 Figure41Safetyvalves 5 Requirements 5.1Steamboiler 5.1.1 Eachsteamboilerandeachisolatableheatedcompartment(e.g.reheater,superheater,economizer)shall beprovidedwithatleastonesuitablesafety

27、devicewhichshallensureagainstexcessivepressure.Thetotalcerti fieddischargecapacityofallsafetydevicesmountedontheboilershallbeatleastequaltothemaximumcontinu ousrating(MCR)oftheboiler.Thesuitabilityofthesafetydeviceshallbedemonstratedbyahottestontheas sembledboiler. The number and type of safety devi

28、ces to be installed shall be specified by the manufacturer and shall meet the requirementsofthisclause. Atleastoneofthefollowingsafetydeviceshallbeconsideredsuitable: a) directloadedsafetyvalvesinaccordancewithprEN12681or; b) assistedsafetyvalvesinaccordancewithprEN12681or; c) supplementaryloadedsaf

29、etyvalvesinaccordancewithprEN12681or; d) pilotoperatedsafetyvalve(POSV)inaccordancewithprEN12681orprENISO41264,consistingofamain valve,controlledbysignalsfrom3pilotvalves; e) controlledsafetypressurereliefsystem(CSPRS)inaccordancewithprEN12685,consistingofamainvalve, controlledbysignalsfrom3sensingl

30、ines. BS EN 12952-10:2002 EN 12952-10:2002 (E)6 Inthecaseofsafetydevicesinaccordancewithd)ande)thefollowingshallapply: Thesafetydeviceshallbecapableofoperatingwhenthesignalfromonlyonepressuresensinglineisavail able. Thesizeandpositionofthepressuresensinglinesshallensurethattheriskoflossoffunctionisr

31、educedtoa minimum. Themechanicalandelectricalpartsofthepilotandcontrolunitwhichareusedtoactuatethemainvalvesshall stillbefunctionallyfiteveninthecaseofanassumedindividualdefect. Itshallbepossibletoprovethereliabilityofthesafetypressurereliefdevicebyfunctionaltestingontheplant. Incaseofassisted,suppl

32、ementaryloadedsafetyvalves,POSVandCSPRSshallbeallowedtocontroloneormore mainvalvesbythesamecontrolunit. 5.1.2 TheminimumflowdiameterofsafetyvalvesormainvalvesofPOSVorCSPRSforboilerswithavolume 10litresshallbeatleast6mmandforvolumes10litresshallbeatleast15mm. 5.1.3 Inthecaseofboilerswithoutsuperheate

33、r(s)thesafetyvalvesormainvalvesofPOSVorCSPRSshallbe connectedtothesteamspace. NOTE Ifthetotalrequireddischargecapacityis q m andthedrumspaceissimultaneously protected by n safety devices (n1)thedischargecapacityofeachofthemshouldbeatleast q m /(n+1). 5.1.4 Inthecaseofoncethroughsteamgeneratorsthesaf

34、etyvalvesormainvalvesofPOSVorCSPRSshall belocatedatthesteamoutletoftheboiler. 5.1.5 Inthecaseofsuperheatersthatcannotbeisolatedthefollowingshallapply: 1) Safetydevicesinaccordancewith5.1.1locatedatthesuperheateroutletshallbeofsufficientcapacitytopre venttheallowablewalltemperatureofthesuperheaterfro

35、mbeingexceeded. 2) Safetydevicesinaccordancewith5.1.1a),b)andc)ratedforatleast75%orinaccordancewith5.1.1.d)or e)ratedforatleast25%oftherequireddischargecapacityshallbelocatedatthesaturatedsteamspaceof theboiler.Nosafetydevicesneedbeinstalledatthesaturatedsteamspaceifthecapacityofthesafetydevice inac

36、cordancewith5.1.1d)ore)locatedatthesuperheateroutletcorrespondstothetotalsteamquantitytobe dischargedandatleastonepressuresignalistransmittedtothecontrolunitfromthesaturatedsteamspace. 3) The superheater safety device shall be so set as to respond, in the case of natural and forced circulation boile

37、rs,beforethesafetydeviceonthesaturatedsteamspace. 5.1.6 AsuperheaterthatcanbeisolatedshallbeequippedwithatleastonesafetyvalveormainvalveofPOSV orCSPRSatthesuperheateroutlet.ThesafetyvalveormainvalveofPOSVorCSPRSshallberatedforatleast 20%oftherequireddischargecapacityoftheboiler.Thesafetyvalveormainv

38、alveofPOSVorCSPRSlocated onthesaturatedsteamspaceofthesteamgeneratorshallinthiscaseberatedforthemaximumcontinuousrating. Ifthesuperheatercanbeisolatedprecautionsshallbetakentopreventoverheating. 5.1.7 EveryreheatershallhaveatleastonesafetyvalveormainvalveofPOSVorCSPRSwithatotaldischarge capacityofno

39、tlessthanthemaximumsteamflowforwhichthereheaterisdesigned. 5.1.8 There shall be no shut off devices between the boiler and its protective safety devices or between the safetydevicesandtheirpointsofdischarge. 5.1.9 Directloadedsafetyvalvesshallbeinstalledintheverticalposition.Thelineleadingtothesafet

40、yvalve (inletpipe)shallbeasshortandstraightaspossibleandshouldnotbelocatedoppositetoothernozzles. Safetydevicesshallbesafeguardedagainstdamagingexternalinfluences,e.g.theweather,whichmayimpair the functionalcapabilityofthesafetydevice.Thetransferofvibrationsontothesafetydeviceshallbeavoided. Safetyd

41、eviceoutletpipesshalldischargetheeffluentsafely.Noliquidshallbeallowedtoaccumulateintheoutlet system.Wherethepipe is endangered byfreezing, itshall be protectedaccordingly. Taking into account the local operating conditions, the pipes shall be so dimensioned and laid out so as to safely withstand th

42、e static, dynamic (reactionforces)andthermalloadings. BS EN 12952-10:2002 EN 12952-10:2002 (E)7 Safety devices where leaking fluid, e.g. due to open bonnet, may directly or indirectly endanger persons or the environment,shallbeprovidedwithsuitableprotectivedevices. 5.1.10 Thecrosssectionofthelinelea

43、dingtothesafetyvalveormainvalveofPOSVorCSPRS(inletpipe)shall notbelessthanthesafetyvalveormainvalveofPOSVorCSPRSinletcrosssection. The outlet pipe crosssection shall not be less than the safety valve or main valve of POSV or CSPRS outlet crosssection. The diameter and length of outlet pipes, bends, silencers etc. will determine the buildup of