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
