1、BRITISH STANDARD BS EN 12953-10:2003 Shell boilers Part 10: Requirements for feedwater and boiler water quality The European Standard EN 12953-10:2003 has the status of a British Standard ICS 13.060.25; 27.060.30; 27.100 BS EN 12953-10:2003 This British Standard, was published under the authority of
2、 the Standards Policy and Strategy Committee on 14 October 2003 BSI 14 October 2003 ISBN 0 580 42759 5 National foreword This British Standard is the official English language version of EN 12953-10:2003. When reference to this part of the European Standard has been published in the Official Journal
3、 of the European Communities (OJ), compliance with it will confer a presumption of conformity with the essential safety requirements of the Pressure Equipment Directive covered by this part of the standard. The UK participation in its preparation was entrusted to Technical Committee PVE/16, Shell bo
4、ilers, which has the responsibility to: A list of organizations represented on this committee can be obtained 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 Catalogue unde
5、r the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct appl
6、ication. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; m
7、onitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was
8、last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM EN1295310 September2003 ICS13.060.25;27.060.30;27.100 Englishversion ShellboilersPart10:Requirementsforfeedwaterandboiler waterquality ChaudirestubesfumePartie10:Exigences relativesl
9、aqualitdeleaudalimentationetdeleauen chaudire GrowasserraumkesselTeil10:Anforderungenandie SpeisewasserundKesselwasserqualitt ThisEuropeanStandardwasapprovedbyCENon4August2003. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardth
10、estatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslat
11、ion undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Hungary,Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,No
12、rway,Portugal,Slovakia,Spain,Sweden,SwitzerlandandUn ited Kingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2003CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers.
13、Ref.No.EN1295310:2003EEN1295310:2003(E) 2 Contents page Foreword3 1 Scope 4 2 Normativereferences 4 3 Termsanddefinitions. .5 4 Conditioning.5 5 Requirements .6 6 Testofthechemicalcomposition 10 6.1 General10 6.2 Sampling.11 6.3 Samplingpoints . 11 7 Analysis 11 7.1 General11 7.2 Visualcriteria. .11
14、 7.3 Analysismethods 12 Bibliography 13EN1295310:2003(E) 3 Foreword Thisdocument(EN1295310:2003)hasbeenpreparedbyTechnicalCommitteeCEN/TC269,“Shellandwater tubeboilers“,thesecretariatofwhichisheldbyDIN. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltext
15、or byendorsement,atthelatestbyMarch2004,andconflictingnationalstandardsshallbewithdrawnatthelatestby March2004. TheEuropeanStandardEN12953concerningshellboilersconsistsofthefollowingParts: Part1: General Part2: Materialsforpressurepartsofboilersandaccessories Part3: Designandcalculationforpressurepa
16、rts Part4: Workmanshipandconstructionofpressurepartsoftheboiler Part5: Inspectionduringconstruction,documentationandmarkingofpressurepartsoftheboiler Part6: Requirementsforequipmentfortheboiler Part7: Requirementsforfiringsystemsforliquidandgaseousfuelsfortheboiler Part8: Requirementsforsafeguardsag
17、ainstexcessivepressure Part9: Requirementsforlimitingdevicesoftheboilerandaccessories Part10: Requirementsforfeedwaterandboilerwaterquality Part11: Acceptancetests Part12: Requirementsforgratefiringsystemsforsolidfuelsfortheboiler Part13: Operatinginstructions CR12953Part14: Guidelinefortheinvolveme
18、ntofaninspectionbodyindependentofthemanufacturer AccordingtotheCEN/CENELECInternalRegulations,thenationalstandardsorganizationsofthefollowing countriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,CzechRepublic,Denmark,Finland, France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Luxembourg
19、,Malta,Netherlands,Norway,Portugal, Slovakia,Spain,Sweden,SwitzerlandandtheUnitedKingdom.EN1295310:2003(E) 4 1Scope ThisPartofthisEuropeanStandardappliestoallshellboilersasdefinedinEN1 29531whichareheatedby combustionofoneormorefuelsorbyhotgasesforthegenerationofsteamand/orhotwater. ThisPartofthisEu
20、ropeanStandardappliestothosecomponentsbetweenthefeedwaterinletandthesteamoutlet ofthesteamgenerator.Thequalityofthesteamproducedisoutsidethescopeofthisstandard. ThisPartofthisEuropeanStandardaimstoensurethattheboilerisabletobeoperatedtominimizeriskto personnel,theboilerandassociatedplantcomponentslo
21、catednearit. NOTE1 ThispartofthisEuropeanStandarddoesnotaimtoachieveoptimumeconomicoperation.Forcertainpurposes,it willbemoreappropriatetooptimizethechemicalcharacteristicsinorderto: increasethethermalefficiency; increasetheavailabilityandreliabilityoftheplant; increasethesteampurity; reducethemaint
22、enancecostsrepair,chemicalcleaning,etc. ThisPartofthisEuropeanStandardsetsoutminimumrequirementsforthespecifictypesofwatertoreducethe riskofcorrosion,sludgeprecipitationorformationofdepositswhichmayleadtoanydamageorotheroperating problems. NOTE2 ThisPartofthisEuropeanStandardhasbeenpreparedontheassu
23、mptionthattheuserofthisEuropeanStandard possessesasufficientknowledgeoftheconstructionandoperationoftheboileraswellasanadequateappreciationofwater andsteamchemistry. 2 Normativereferences ThisEuropeanStandardincorporates,bydatedorundatedreference,provisionsfromotherpublications.These normativerefere
24、ncesarecitedattheappropriateplacesinthetext,andthepublicationsarelistedhereafter.For datedreferences,subsequentamendmentstoorrevisionsofanyofthesepublicationsapplytothisEuropean Standardonlywhenincorporatedinitbyamendmentorrevision.Forundatedreferences,thelatesteditionofthe publicationreferredtoappl
25、ies(includingamendments). EN129531:2002, ShellboilersPart1:General. ENISO99631, WaterqualityDeterminationofalkalinityPart1:Determinationoftotalandcompositealka linity(ISO99631:1994). ISO56671, WaterqualitySamplingPart1:Guidanceonthedesignofsamplingprogrammes. ISO56673, WaterqualitySamplingPart3:Guid
26、anceonthepreservationandhandlingofsamples. ISO5814, WaterqualityDeterminationofdissolvedoxygenElectrochemicalprobemethod. ISO6059, WaterqualityDeterminationofthesumofcalciumandmagnesiumEDTAtitrimetricmethod. ISO6332, WaterqualityDeterminationofironSpectrometricmethodusing1,10phenanthroline. ISO6878,
27、 Waterquality Spectrometricdeterminationofphosphorususingammoniummolybdate. ISO7888, WaterqualityDeterminationofelectricalconductivity.EN1295310:2003(E) 5 ISO8245, WaterqualityGuidelinesforthedeterminationoftotalorganiccarbon(TOC)anddissolvedorganic carbon(DOC). ISO8288, WaterqualityDeterminationofc
28、obalt,nickel,copper,zinc,cadmiumandleadFlameatomic absorptionspectrometicmethods. ISO99641, WaterqualityDeterminationofsodiumandpotassiumPart1:Determinationofsodiumbyatomic absorptionspectrometry. ISO99642, WaterqualityDeterminationofsodiumandpotassiumPart2:Determinationofpotassiumby atomicabsorptio
29、nspectrometry. ISO10523, WaterqualityDeterminationofpH. 3 Termsanddefinitions ForthepurposeofthispartofthisEuropeanStandard,thetermsanddefinitionsgiveninEN129531:2002andthe followingdefinitionsapply. 3.1 directconductivity directmeasuredconductivityofwater 3.2 acidconductivity conductivityofwatermea
30、suredinthehydrogenionconcentrationfromcontinuouslyflowthroughdownstreamofa stronglyacidiccationexchanger 3.3 makeupwater waterwhichcompensatesforlossesofwaterandsteamfromthesystem 3.4 feedwater mixtureofreturnedcondensateand/ormakeupwatersuppliedtotheboilerinlet 3.5 demineralizedfeedwater waterwitha
31、nelectrolytecontentaccordingtoanacidconductivityof 0,2 2 ) 0,02mg/ l 3.6 boilerwater waterwithinanaturalorassistedcirculationboiler 3.7 attemperatorspraywater waterforinjectiontocontrolsteamtemperature 4Conditioning Certainqualitycharacteristicsoffeedwaterandboilerwatershallbeimprovedbytreatmentwith
32、chemicals. Thisconditioningcancontribute: tosupporttheformationofmagnetitelayersorotherprotectiveoxidelayers; tominimizecorrosionbyoptimizingthepHvalue;EN1295310:2003(E) 6 tostabilizehardnessandtopreventorminimizescaling; toeffectchemicaloxygenscavenging; todevelopspecialcoatingswithprotectiveeffect
33、byfilmformationonmetallicsurfaces. Conventionalinorganicconditioningagentsincludee.g.sodiumandpotassiumhydroxide,sodiumphosphate,sodium sulphite,ammoniaandhydrazine. NOTE1 Theuseofsomeofthesechemicalscanberestrictedinsomecountries. However,organicbasedconditioningagentshavebeeninuseformanyyearsnow.I
34、forganicbasedconditioning agentsareused,thequantitiesandmethodsforuseaswellasanalysismethodshallbespecifiedbythesupplierof thechemicalproducts. NOTE2 Thegeometryofshellboilerscangiverisetostressesand/orcrevices,e.g.atweldedorrolledfluetubestotube sheetjoints.Becauseofevaporationaconcentrationofdisso
35、lved,nonvolatileingredientsoftheboilerwater(salts,solid conditioningagents)willtakeplace.Undersuchconditionslocalconcentrationofalkalicanoccurwhichleadstostress corrosion.Therefore,withalmostunbufferedfeedwaterof 30 alkalizingwithsodiumhydroxideis permissibleonlyiftherecommendedpHrangecannotbeobtain
36、edwithsodiumphosphatealone.Inthiscase,thepHvaluewill havequickvariationswithlowlevelofsodiumhydroxide. 5Requirements 5.1 Thevaluesforthehighestallowableconcentrationsofanumberofimpuritiesandforthemaximumand minimumconcentrationsofchemicalagentswhichareaddedinordertominimizecorrosion,sludgeformationa
37、nd deposits,shallbeinaccordancewithTables51and52andFigures51and52.EN1295310:2003(E) 7 Table51Feedwaterforsteamboilers(exceptattemperatorspraywater)andhotwaterboilers Parameter Unit Feedwaterforsteamboilers Makeupwaterfor hotwaterboilers Operatingpressure bar (=0,1MPa) 0,5to20 20 totalrange Appearanc
38、e clear,freefromsuspendedsolids Directconductivityat25C notspecified,onlyguidevaluesrelevantforboilerwater seetable52 pHvalueat25C a 9,2 b 9,2 b 7,0 Totalhardness(Ca+Mg) mmol/l 7,0thepHvalueofboilerwateraccordingtotable52shouldbeconsidered. c Atoperatingpressure1bartotalhardnessmax.0,05mmol/ lshallb
39、eacceptable. d Insteadofobservingthisvalueatintermittentoperationoroperationwithoutdeaeratoriffilmformingagentsand/orex cessofoxygenscavengershallbeused. e Organicsubstancesaregenerallyamixtureofseveraldifferentcompounds.Thecompositionofsuchmixturesandthe behaviouroftheirindividualcomponentsunderthe
40、conditionsofboileroperationaredifficulttopredict.Organic substancesmaybedecomposedtoformcarbonicacidorotheracidicdecompositionproductswhichincreasetheacid conductivityandcausecorrosionordeposits.Theyalsomayleadtofoamingand/orprimingwhichshallbekeptaslow aspossible.EN1295310:2003(E) 8 Table52Boilerwa
41、terforsteamboilersandhotwaterboilers Boilerwaterforsteamboilersusing Parameter Unit Feedwaterdirect conductivity30 Feedwaterdirect conductivity 30 Boilerwater forhotwater boilers Operatingpressure bar (=0,1MPa) 0,5to20 20 0,5 totalrange Appearance clear,nostablefoam Directconductivityat25C 6000 a se
42、eFigure51 a 1500 1500 pHvalueat25C 10,5to12,0 10,5to11,8 10,0to11,0 b,c 9,0to11,5 d Compositealkalinity mmol/l 1to15 a 1to10 a 0,1to1,0 c 5 Silica(SiO 2)concentration mg/l pressuredependent,accordingtofigure52 Phosphate(PO 4) e mg/l 10to30 10to30 6to15 Organicsubstances seefootnote f a Withsuperheat
43、erconsider50%oftheindicateduppervalueasmaximumvalue. b BasicpHadjustmentbyinjectingNa 3PO 4,additionalNaOHinjectiononlyifthepHvalueis10. c Iftheacidconductivityoftheboilerfeedwateris0,2 Na+Kconcentrationis0,010mg/l,phosphateinjectionisnot necessary.UndertheconditionsAVT(allvolatiletreatment,feedwaterpH 9,2andboilerwaterpH 8,0)canb
