SIST EN 12953-1:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Mnogovodni kotli - 1. del: SplošnoGroßwasserraumkessel - Teil 1: AllgemeinesChaudieres a tubes de fumée - Partie 1: GénéralitésShell boilers - Part 1: General27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 12953-1:2002SIST EN 12953-1:2002en01-november-2002SIST EN 12953-1:2002SLOVENSKI
STANDARD



SIST EN 12953-1:2002



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12953-1May 2002ICS 27.060.30; 27.100English versionShell boilers - Part 1: GeneralChaudières à tubes de fumée - Partie 1: GénéralitésGroßwasserraumkessel - Teil 1: AllgemeinesThis European Standard was approved by CEN on 14 March 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12953-1:2002 ESIST EN 12953-1:2002



EN 12953-1:2002 (E)ContentspageForeword .31Scope .41.1General .41.2Boiler plants .41.3Exclusions .72Normative references .83Terms and definitions .84Symbols and abbreviations .105Responsibilities .145.1Responsibility of the purchaser .145.2Responsibility of the manufacturer .145.3Responsible authority .156Interpretations .157Design/type appraisal of pressure parts .15Annex A
(informative)
Information to be supplied by the purchaser to themanufacturer .16Annex B
(informative)
Guidance in the use of the conformity assessmentprocedures .18Annex ZA
(informative)
Clauses of this European Standard addressingessential safety requirements or other provisions of the Pressure Equipment Directive
.....................................22Bibliography
............................................ 232SIST EN 12953-1:2002



EN 12953-1:2002 (E)ForewordThis document EN 12953-1:2002 has been prepared by Technical Committee CEN/TC 269 "Shell and water-tubeboilers", the secretariat of which is held by DIN.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latestby November 2002.This document has been prepared under a mandate given to CEN by the European Commission and the EuropeanFree Trade Association and supports essential requirements of the Pressure Equipment Directive (PED) [1]. For the relationship with the Pressure Equipment Directive see informative annex ZA, which is an integral part of thisdocument.The European Standard EN 12953 concerning shell boilers consists of the following parts:-Part 1:General.-Part 2:Materials for pressure parts of boilers and accessories.-Part 3:Design and calculation for pressure parts.-Part 4:Workmanship and construction of pressure parts of the boiler.-Part 5:Inspection during construction, documentation and marking of pressure parts of the boiler.-Part 6:Requirements for equipment for the boiler.-Part 7:Requirements for firing systems for liquid and gaseous fuels for the boiler.-Part 8:Requirements for safeguards against excessive pressure.-Part 9:Requirements for limiting devices of the boiler and accessories.-Part 10: Requirements for boiler feedwater and boiler water quality.-Part 11: Acceptance tests.-Part 12: Requirements for firing systems for solid fuels for the boiler.-Part 13: Operating instructions.CR 12953-14, Shell boilers - Guideline for the involvement of an inspection body independent of the manufacturer.Although these parts may be obtained separately, it should be recognized that the parts are inter-dependent. Assuch, the design and manufacture of shell boilers requires the application of more than one part in order for therequirements of the European Standard to be satisfactorily fulfilled.The annexes A and B of this European Standard are informative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countriesare bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France,Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden,Switzerland and the United Kingdom.3SIST EN 12953-1:2002



EN 12953-1:2002 (E)1
Scope1.1
GeneralThis European Standard specifies the design, construction, equipment, operational and water treatment requirementsdrawn up with a view to ensuring the operating safety of new stationary shell boiler plants.This European Standard includes the requirements for the prevention of over-heating and inadmissible over-pressurisation.1.2
Boiler plantsA boiler plant consists of:a)the shell boiler including all pressure parts from the feedwater inlet (including the inlet valve) to the steamand/or hot-water outlet (including the outlet valve). This includes economisers, superheaters and associatedconnecting pipes which are heated by flue gas and are not separated from the main system by interveningshut-off devices. Also included is any piping connecting the boiler to and including the first isolating valve;b)isolated economisers, superheaters and associated connecting pipes;c)expansion vessels and/or expansion tanks for plants for hot water production;d)thermal insulation and/or refractory and cladding;e)installations for heat supply and heating;f)installations for processing and feeding the fuel into the boiler;g)installations for the air supply of the boiler including the fans;h)installations for the feedwater supply of the boiler;i)all control and safety systems.This European Standard specifies requirements for both directly fired and electrically heated boilers including lowpressure boilers (LPB, see 3.7) as well as for waste-heat boilers with a gas-side pressure not exceeding 0,5 bar1)of cylindrical design, constructed from carbon or carbon manganese steels by fusion welding and a design pressurenot exceeding 40 bar1). The boilers covered by this European Standard are intended for land use for providingsteam or hot water (typical examples are shown in Figures 1.2-1 to 1.2-5).Where a particular boiler is a combination of shell boiler and water-tube boiler design, then the water-tube boilerstandard EN 12952 is used in addition to this European Standard. One such example of this combination is shownin Figure 1.2-2.This European Standard applies to the boiler proper, from the feed-water inlet connection to the steam outletconnection and to all other connections, including the valves and steam and water fittings. If welded ends are used,the requirements specified herein begin or end at the weld where flanges, if used, would have been fitted.This European Standard applies to boilers having a capacity of greater than 2 l, a maximum allowable pressuregreater than 0,5 bar and with a maximum design temperature in excess of 110 °C.For Low Pressure Boilers (LPB) less stringent requirements concerning design and calculation are acceptable.Details are defined in the respective clauses.The boiler plant comprises, besides the boiler proper as described above, all pieces of equipment necessary for theintended mode of operation, for which requirements have been laid down in the different parts of this EuropeanStandard.1)For boilers operating at pressure greater than those stated the rules of this standard equally apply. However, itis generally considered that additional design analysis, inspection and testing may be necessary.4SIST EN 12953-1:2002



EN 12953-1:2002 (E)a) two pass boilerb) three pass boilerKey
1
cylindrical shell 7 reversal chamber tube plate
2 furnace tube (1st pass)8 wet back rear plate
3 front tube plate9 header
4 rear plate10 tube wall
5 smoke tube(s)11 refractory
6 wrapper plateNOTE
The effective radiant heating surface comprises the furnace tube and the surface of the reversal cham-ber, where applicable.Figure 1.2-1 — Wet back boiler with internal reversal chamber5SIST EN 12953-1:2002



EN 12953-1:2002 (E)a) two pass boilerb) three pass boilerNOTEThe effective radiant heating surface comprises the furnace tube and complete surface of the reversal chamber.Figure 1.2-2 — Wet back boiler with external reversal chambera) two pass boilerb) three pass boilerNOTE The effective radiant heating surface comprises the furnace tube wrapper plate and reversal chamber tube plate.Figure 1.2-3 — Semi-wet back boilera) two pass boilerb) three pass boilerNOTE The effective radiant heating surface comprises the furnace tube and rear tube plate.Figure 1.2-4 — Dry back boiler6SIST EN 12953-1:2002



EN 12953-1:2002 (E)NOTE The effective radiant heating surface consists of the furnace onlyFigure 1.2-5 — Reverse flame boiler1.3
ExclusionsThis European Standard does not apply to water-tube boilers, coil boilers, to boilers for railway locomotives, or tomarine boilers. This standard does not cover brickwork setting and insulation.However, no construction code can be sufficiently detailed in order to guarantee, in all cases, the necessaryoperational safety. It is therefore the manufacturer's responsibility, in addition to complying with the requirementsof this European Standard, to take into consideration the special measures which could be necessary in order toobtain the required level of safety.Be that as it may, the safety and reliability of a boiler complying with the requirements of this standard and with theadditional precautions which may possibly be taken by the manufacturer can only be guaranteed if the feedwaterand boiler water are in accordance with the requirements of prEN 12953-10 and if the boiler is correctly operatedand maintained. To achieve this, the instructions given by the manufacturer in the operating and maintenancemanuals are followed.7SIST EN 12953-1:2002



EN 12953-1:2002 (E)2
Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies (including amendments).EN 764,
Pressure equipment — Terminology and symbols — Pressure, temperature, volume.prEN 764-3:1998,
Pressure equipment — Part 3: Definition and parties involved.EN 12952,
Water-tube boilers and auxiliary installations.EN 12953-3:2002,
Shell boilers — Part 3: Design and calculation.prEN 12953-10,
Shell boilers — Part 10: Requirements for feedwater and boiler water quality.CR 12953-14, Shell boilers - Part 14: Guideline for the involvement of an inspection body independent of themanufacturer.3
Terms and definitionsFor the purposes of this European Standard, the terms and definitions of EN 764, prEN 764-3 and the followingapply.3.1purchaser individual or organization that buys the completed boiler plant or part thereof from the manufacturer [EN 12952-1]3.2
manufacturerindividual or organization responsible for the design, fabrication, testing, installation where relevant, and compliancewith the requirements of this standard whether executed by him or a subcontractor, see EN 12952-13.3
designer individual or organization that, on behalf of the manufacturer, carries out the design of the boiler plant and thedesigner determines the shape, dimensions and thicknesses of the boiler plant components, selects the materialsand details the methods of construction and testing [EN 12952-1]3.4material supplier individual or organization, not being a material manufacturer, that supplies material or prefabricated parts to be usedin the construction of the boiler plant or any component thereof [EN 12952-1]3.5
material manufacturer individual or organization that produces the basic material for the fabrication of boiler plant components orprefabricated standardized parts [EN 12952-1]8SIST EN 12953-1:2002



EN 12953-1:2002 (E)3.6
responsible authoritythis standard identifies the involvement of competent organisations which are independent of the manufacturer. Suchorganisations may be notified bodies, recognised third-party organisations or user inspectorates. For the purpose ofthis standard all these organisations have been collectively termed responsible authorities (RA) (see also EN 12952-1)NOTE 1The definition of a notified body and the criteria controlling its operation are given respectively in article 12 andAnnex IV of the Pressure Equipment Directive.NOTE 2The definition of a recognized third-party organisation and the criteria controlling its operation are given respectivelyin article 13 and Annex IV of the Pressure Equipment Directive.NOTE 3The definition of a user inspectorate and the criteria controlling its operation are given respectively in article 14 andannex V of the Pressure Equipment Directive.3.7
low pressure boilers (LPB) steam boilers with a maximum saturation temperature of 120 °C (this corresponds to a pressure of 1 bar gauge) orhot water generators with a maximum outlet temperature of 120 °C and a maximum allowable pressure of 10 bargauge9SIST EN 12953-1:2002



EN 12953-1:2002 (E)4
Symbols and abbreviationsFor the purposes of this European Standard, the general symbols and abbreviations indicated in Table 4-1 shallapply.Table 4-1 — Symbols and abbreviationsSymbolDescriptionUnitAEffective radiant heating surface (see Figures 1.2-1 to 1.2-5)m2AfCross-sectional area effective as compensation without consideration ofallowancesmm2AfbCross-sectional area of branch effective as compensationmm2AfpCross-sectional area of reinforcing pad effective as compensationmm2AfsCross-sectional area of main body effective as compensationmm2ApPressure-loaded area without consideration of allowancesmm2ApbPressure-loaded area relative to branchmm2ApsPressure-loaded area relative to main bodymm2AtOriginal cross-sectional area of test piece subjected to a tensile testmm2aDimensions indicated in Figures 10.1-1, 10.2-2 to 10.2-4 of EN 12953-3:2002mmiInner major axis of compensation platemmaoOuter major axis of compensating platemmbDimensions indicated in Figures 10.1-1, 10.2-2 to -10.2-5, 13.4-1 and13.4-2 of EN 12953-3:2002mmb1Minor axis of manholemmbiInner minor axis of compensating platemmboOuter minor axis of compensating platemmCShape factor—C1Shape factor for unstayed walls, ends or plates as given in 9.3 ofEN 12953-3:2002—c1Minus tolerance on the ordered nominal wall thicknessmmc2Allowance for metal wastagemmDbGasket mean diametermmDLBolt circle diametermmdDiameter of tube holemmdgDepth of welded-on girder staymmdiInside diametermmdibInside diameter of branch without allowancesmmdipDiameter of inner periphery of circular pad or compensating platemmdisInside diameter of main body (cylindrical shell, spherical shell or dishedend) without allowancesmm(continued)10SIST EN 12953-1:2002



EN 12953-1:2002 (E)Table 4-1 (continued)SymbolDescriptionUnitdmMean diametermmdoOutside diametermmdobOutside diameter of branch without allowancesmmdopDiameter of outer periphery of circular pad of compensating platemmdosOutside diameter of main body without allowancesmmdsDiameter of staymmEModulus of elasticity at design temperatureN/mm2eWall thicknessmmecbRequired wall thickness of branch or nozzle without allowancesmmecfRequired wall thickness of furnace without allowancesmmechRequired wall thickness of flat end without allowancesmmecpRequired wall thickness of reinforcing padmmecsRequired wall thickness of the main body (cylindrical or spherical shellsor dished ends) without allowancesmmectRequired wall thickness of straight tube without allowancesmmefaRequired wall thickness of furnace with allowancesmmegRequired thickness of gusset staymmehOrdered thickness of flat endmmeh1Wall thickness in relief groovemmepOrdered wall thickness of reinforcing padmmerbActual wall thickness of branch or nozzle without allowancesmmerfActual wall thickness of furnacesmmerhActual wall thickness of flat end without allowancesmmerpActual wall thickness of reinforcing pad without allowancesmmersActual wall thickness of main body (cylindrical or spherical shell or dishedend) without allowancesmmertActual tube wall thickness without allowancesmmesOrdered wall thickness of main bodymmesaRequired wall thickness of main body with allowancesmmetOrdered tube wall thicknessmmetaRequired wall thickness of straight tube with allowancesmm(continued)11SIST EN 12953-1:2002



EN 12953-1:2002 (E)Table 4-1 (continued)FCalculation heat fluxW/m2fNominal design stressN/mm2faExisting mean stressN/mm2faFExisting mean stress between the centres of two openingsN/mm2fbDesign stress for branch materialN/mm2fcCombined stress at supportsN/mm2fpDesign stress for reinforcing ring materialN/mm2fsDesign stress for main body materialN/mm2GGas mass flow rate in first pass tubeskg/(m2 × s)g, g1Clear height as s
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