EN 12952-1:2001

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Vodocevni kotli in pomožne napeljave - 1. del: SplošnoWasserrohrkessel und Anlagenkomponenten - Teil 1: AllgemeinesChaudieres a tubes d'eau et installations auxiliaires - Partie 1: GénéralitésWater-tube boilers and auxiliary installations - Part 1: General27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 12952-1:2001SIST EN 12952-1:2002en01-november-2002SIST EN 12952-1:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12952-1December 2001ICS 27.040English versionWater-tube boilers and auxiliary installations - Part 1: GeneralChaudières à tubes d'eau et installations auxiliaires - Partie1: GénéralitésWasserrohrkessel und Anlagenkomponenten - Teil 1:AllgemeinesThis European Standard was approved by CEN on 10 March 2000.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, 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© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12952-1:2001 ESIST EN 12952-1:2002

.........7Page5Responsibilities ...................115.1Responsibility of the purchaser .........115.2Responsibility of the manufacturer ......115.3Responsible authority ...............116Interpretations ....................117Design/type appraisal of pressure parts 11Annex A (informative) Guidance in the use of theconformity assessment procedures ......13A.1General .........................13A.2Principles for the application of the PED ..14Annex ZA
(informative)
Clauses of thisEuropean Standard addressing essentialsafety requirements or other provisions ofthe Pressure Equipment Directive .172SIST EN 12952-1:2002

Part 4 is not applicable during the design, construction and installation stages.The annexes A and ZA of this European Standard are informative.
1) Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation ofthe laws of the Member States concerning pressure equipment; OJEC L181.3SIST EN 12952-1:2002

Scope1.1
GeneralThis European Standard applies to water-tube boilers with volumes in excess of 2 litres for the generation of steamand/or hot water at an allowable pressure greater than 0,5 bar and with a temperature in excess of 110 °C as wellas auxiliary installations (other plant equipment).The purpose of this European Standard is to ensure that the hazards associated with the operation of water-tubeboilers are reduced to a minimum and that adequate protection is provided to contain the hazards that still prevailwhen the water-tube boiler is put into service. This protection will be achieved by the proper application of thedesign, manufacturing, testing and inspection methods and techniques incorporated in the various parts of thisEuropean Standard. Where appropriate, adequate warning of residual hazards and the potential for misuse are givenin the training and operating instructions and local to the equipment concerned (see prEN 12952-8, prEN 12952-9and prEN 12952-16).1.2
Boiler assemblyFor the purpose of this standard, the boiler assembly includes:a)the water-tube boiler including all the pressure parts from the feedwater inlet (including the inlet valve) up to andincluding the steam and/or hot water outlet (including the outlet valve or, if there is no valve, the first circumfer-ential weld or flange downsteam of the outlet header). All superheaters, reheaters, economizers, the associated safety accessories and interconnecting tubing that areheated by means of the gases of combustion and are not capable of isolation from the main system byinterposing shut-off valves.Additionally, the tubing that is connected to the boiler involved in services such as draining, venting, desuper-heating, etc., up to and including the first isolating valve in the tubing line downstream of the boiler.Reheaters which are heated by the flue gas or independently fired, and are separately provided with their safetyaccessories including all control and safety systems.b)isolatable superheaters, reheaters, economizers and related interconnecting tubing;c)the heat supply or firing system;d)the means of preparing and feeding the fuel to the boiler including the control systems;e)the means of providing the boiler with feedwater including the control system;f)the pressure expansion vessels and tanks of hot water generating plant.1.3
Other plant equipmenta)the boiler supporting structural steelwork, the thermal insulation and/or brickwork and the casing;b)the means of providing the boiler with air including the forced draught fans and air pre-heaters which are heatedby the gases of combustion;c)the facilities for moving flue gases through the boiler up to the stack inlet, including the induced draught fans andthe air pollution reducing equipment located in the flue gas removal path;d)all other equipment necessary for the operation of the boiler plant.For a description of the types of operating systems used for water-tube boiler plant, see prEN 12952-7.4SIST EN 12952-1:2002

ExclusionsThis European Standard does not apply to the following types of boiler plant:a)boilers other than stationary boilers;b)shell type boilers including electrical boilers;c)nuclear primary circuits, the failure of which can cause an emission of radioactivity.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).prEN 764 (All parts),
Pressure equipment prEN 764-3:1999,
Pressure equipment — Part 3: Definition and parties involved.EN 12952-5:2001,
Water-tube boilers and auxiliary installations — Part 5: Workmanship and construction ofpressure parts of the boiler.prEN 12952-6:1998,
Water-tube boilers and auxiliary installations — Part 6: Inspection during construction,documentation and marking of pressure parts of the boiler.3
Terms and definitionsFor the purposes of this European Standard, the terms and definitions in prEN 764 and the following apply:3.1purchaserindividual or organization that buys the completed boiler plant or part thereof from the manufacturer3.2manufacturerindividual or organization responsible for the design, fabrication, testing, installation where relevant, and compliancewith the requirements of this standard whether executed by him or a subcontrator, see prEN 764-3:19995SIST EN 12952-1:2002

The definition of a notified body and the criteria controlling its operation are given in Article 12 of the PressureEquipment Directive.NOTE 2
The definition of a recognized third-party organization and the criteria controlling its operation are given in Article 13 ofthe Pressure Equipment Directive.NOTE 3
The definition of a user inspectorate and the criteria controlling its operation are given in Article 14 of the PressureEquipment Directive.NOTE 4
The responsibility of the manufacturer is described in 3.2.6SIST EN 12952-1:2002

Symbols and abbrevationsFor the purposes of this European Standard, the general symbols and abbreviations given in table 4-1 and table 4-2shall apply.Table 4-1 — SymbolsSymbolDescriptionUnitAareamm2Afeffective cross-sectional area without allowancesmm2Afbeffective cross-sectional area of branchmm2Afpeffective cross-sectional area of reinforcing ringmm2Afseffective cross-sectional area of bodymm2Appressurized area without allowancesmm2Apbpressurized area referred to branchmm2Apspressurized area referred to bodymm2Cshape factor—C1shape factor for unstayed walls, ends or plates—C2shape factor for rectangular and elliptical plates—C3shape factor for flat plates with openings—c1minus tolerance on the ordered nominal wall thicknessmmc2allowance for metal wastagemmDbmean diameter of flat ends with knuckle or design diameter of flat cover platesmmDLbolt circle diametermmddiameter of tube hole (if applicable in the condition after metal wastage)mmdiinside diametermmdibinside diameter of branch without allowancesmmdisinside diameter of main body (cylindrical shell, spherical shell or dished end) withoutallowancesmmdmmean diametermmdooutside diametermmdoboutside diameter of branch without allowancesmmdosoutside diameter of main body without allowancesmmdsstay diametermmEmodulus of elasticity at design temperatureN/mm2ewall thicknessmmebordered wall thickness of the branchmmecbrequired wall thickness of branch or nozzle without allowancesmmechrequired wall thickness of flat end without allowancesmmecsrequired wall thickness of cylindrical or spherical shells or dished end withoutallowancesmm7SIST EN 12952-1:2002
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