BS EN 12952-1:2015 BSI Standards Publication Water-tube boilers and auxiliary installations Part 1: General BS EN 12952-1:2015 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 12952-1:2015 It supersedes BS EN 12952-1:2001 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee PVE/2, Water Tube And Shell Boilers A list of organizations represented on this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 correct application © The British Standards Institution 2015 Published by BSI Standards Limited 2015 ISBN 978 580 85237 ICS 23.020.01; 27.040; 27.060.30 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2015 Amendments/corrigenda issued since publication Date Text affected BS EN 12952-1:2015 EN 12952-1 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM October 2015 ICS 27.040 Supersedes EN 12952-1:2001 English Version Water-tube boilers and auxiliary installations - Part 1: General Chaudières tubes d'eau et installations auxiliaires Partie 1: Généralités Wasserrohrkessel und Anlagenkomponenten - Teil 1: Allgemeines This European Standard was approved by CEN on 29 August 2015 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 12952-1:2015 E BS EN 12952-1:2015 EN 12952-1:2015 (E) Contents Page European foreword 1.1 1.2 1.3 1.4 Scope General Boiler assembly Other plant equipment Exclusions Normative references Terms and definitions Interdependency of the parts of the series Symbols and abbreviations 6.1 6.2 Responsibilities 11 Purchaser 11 Manufacturer 12 Design/type appraisal of pressure parts 12 Annex A (informative) Significant technical changes between this European Standard and the previous edition 13 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU 14 Bibliography 15 BS EN 12952-1:2015 EN 12952-1:2015 (E) European foreword This document (EN 12952-1:2015) has been prepared by Technical Committee CEN/TC 269 “Shell and water-tube boilers”, 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 or by endorsement, at the latest by April 2016, and conflicting national standards shall be withdrawn at the latest by April 2016 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document supersedes EN 12952-1:2001 This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 2014/68/EU For relationship with EU Directive 2014/68/EU, see informative Annex ZA which is an integral part of this document The informative Annex A lists the significant technical changes between this European Standard and the previous edition EN 12952, Water-tube boilers and auxiliary installations 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 of the boiler; — Part 4: In-service boiler life expectancy calculations; — Part 5: Workmanship and construction of pressure parts of the boiler; — Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler; — Part 7: Requirements for equipment for the boiler; — Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler; — Part 9: Requirements for firing systems for pulverized solid fuels for the boiler; — Part 10: Requirements for safeguards against excessive pressure; — Part 11: Requirements for limiting devices of the boiler and accessories; — Part 12: Requirements for boiler feedwater and boiler water quality; — Part 13: Requirements for flue gas cleaning systems; BS EN 12952-1:2015 EN 12952-1:2015 (E) — Part 14: Requirements for flue gas DENOX-systems using liquefied pressurized ammonia and ammonia water solution; — Part 15: Acceptance tests; — Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler; — (CR 12952) Part 17: Guideline for the involvement of an inspection body independent of the manufacturer; — Part 18: Operating instructions Although these parts can be obtained separately, it should be recognized that the parts are interdependent As such, the design and manufacture of water-tube boilers requires the application of more than one part in order for the requirements of the standard to be satisfactorily fulfilled NOTE A “Boiler Helpdesk” has been established in CEN/TC 269 which may be contacted for any questions regarding the application of the European Standards series EN 12952 and EN 12953, see the following website: http://www.boiler-helpdesk.din.de According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS EN 12952-1:2015 EN 12952-1:2015 (E) Scope 1.1 General This European Standard applies to water-tube boilers with volumes in excess of two litres for the generation of steam and/or hot water at a maximum allowable pressure PS greater than 0,5 bar and with a temperature in excess of 110 °C as well as auxiliary installations (other plant equipment) The purpose of this European Standard is to ensure that the necessary essential safety requirements according to Annex I of the Pressure Equipment Directive are fulfilled in order to guarantee the safety of water tube boilers This aim will be achieved by: — the proper application of the design, manufacturing, testing and inspection methods and techniques, — the provision of protective measures against hazards, which cannot be eliminated, and — the provision of information on residual hazards and other measures to reduce risk, which are incorporated in the various parts of this European Standard The requirements of this European Standard take account of pressure-related hazards, which apply to water tube boilers, including failure of pressure-retaining components due to overheating This standard recognizes that it is not possible to cover all the combinations of situations that might arise 1.2 Boiler assembly For the purpose of this European Standard, the boiler assembly includes: — the water-tube boiler including all the pressure parts from the feedwater inlet (including the inlet valve) up to and including the steam and/or hot water outlet (including the outlet valve or, if there is no valve, the first circumferential weld or flange downsteam of the outlet header); — all superheaters, reheaters, economizers, that are not capable of isolation from the main system by interposing shut-off valves, associated safety accessories and interconnecting piping; — additionally, the piping that is connected to the boiler involved in services such as draining, venting, desuperheating, etc., up to and including the first isolating valve in the tubing line downstream of the boiler; — reheaters which are independently fired, and are separately provided with their safety accessories including all control and safety systems The following equipment and components can be integrated in the assembly at the discretion of the manufacturer: — isolatable superheaters, reheaters, economizers and related interconnecting piping; — the heat supply or firing system; — the means of preparing and feeding the fuel to the boiler including the control systems; — the means of providing the boiler with feedwater including the control system; BS EN 12952-1:2015 EN 12952-1:2015 (E) — the pressure expansion vessels and tanks of hot water generating plant 1.3 Other plant equipment a) 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 heated by the gases of combustion; c) the facilities for moving flue gases through the boiler up to the stack inlet, including the induced draught fans and the air pollution reducing equipment located in the flue gas removal path; d) all other equipment necessary for the operation of the boiler plant 1.4 Exclusions This European Standard does not apply to the following types of boiler plant: a) boilers other than stationary boilers; b) shell type boilers; c) electrical boilers; d) nuclear primary circuits, the failure of which can cause an emission of radioactivity Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies EN 764 (all parts), Pressure equipment EN 12952-5:2011, Water-tube boilers and auxiliary installations — Part 5: Workmanship and construction of pressure parts of the boiler EN 12952-6:2011, Water-tube boilers and auxiliary installations — Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler Terms and definitions For the purposes of this document, the terms and definitions given in EN 764 (all parts) and the following apply 3.1 purchaser individual or organization that buys the boiler or a part thereof 3.2 manufacturer individual or organization that is responsible for the design, fabrication, testing, inspection, installation of pressure equipment and assemblies where relevant BS EN 12952-1:2015 EN 12952-1:2015 (E) Note to entry: The manufacturer can subcontract one or more of the above-mentioned tasks under its responsibility (for example, designer, installer, etc.) [SOURCE: EN 764-3:2015, 3.5.5, modified – Note complete and Note deleted.] 3.3 designer individual or organization that, on behalf of the manufacturer, carries out the design of the boiler plant Note to entry: The designer determines the shape, dimensions and thicknesses of the boiler plant components, selects the materials and details the methods of construction and testing 3.4 material supplier individual or organization, that may or may not be the material manufacturer, who supplies material or parts used in the manufacture of pressure equipment and assemblies [SOURCE: EN 764-3:2015, 3.5.7] 3.5 material manufacturer individual or organization that produces material in the basic product forms used in the manufacture of pressure equipment [SOURCE: EN 764-3:2015, 3.5.6] 3.6 responsible authority competent organizations which are independent of the manufacturer Note to entry: This standard identifies responsible authorities Such organizations may be notified bodies, recognized third-party organizations or user inspectorates For the purpose of this standard, these organizations have been collectively termed responsible authorities (RA) Note to entry: The definition of a notified body and the criteria controlling its operation are given in Article 12 of the Pressure Equipment Directive Note to entry: The definition of a recognized third-party organization and the criteria controlling its operation are given in Article 13 of the Pressure Equipment Directive Note to entry: The definition of a user inspectorate and the criteria controlling its operation are given in Article 14 of the Pressure Equipment Directive Note to entry: The responsibility of the manufacturer is described in 3.2 Interdependency of the parts of the series Parts to 18 of EN 12952 form a consistent set of specifications which shall be followed for compliance to the Standard NOTE NOTE Parts 4, 12, 13 and 15 of the series are published as supporting European Standards Part 17 of the series is published as a CEN Report It is not a European Standard BS EN 12952-1:2015 EN 12952-1:2015 (E) Symbols and abbreviations For the purposes of this European Standard, the general symbols and abbreviations given in Table 5-1 shall apply Table 5-1 — Symbols Symbol Description Unit A area mm2 effective cross-sectional area of branch mm2 Af Afb Afp Afs Ap Apb Aps As C C1 c1 C2 c2 C3 d d1 di dib dis dL dm dmb dms dob dos Etc e e’s et’ ea eb ecb effective cross-sectional area without allowances effective cross-sectional area of reinforcing pad effective cross-sectional area of main body pressurized area without allowances pressurized area referred to branch pressurized area referred to main body shell cross-sectional area referred to main body shape factor shape factor for unstayed ends or plates allowance to consider the minus tolerance of wall thickness shape factor for rectangular and elliptical plates allowance for metal wastage shape factor for flat plates with openings diameter of tube hole (if applicable in the condition after metal wastage) diameter of counter boring for expanded tubes inside diameter inside diameter of branch without allowances inside diameter of main body (cylindrical shell, spherical shell or dished end) without allowances bolt circle diameter of a plate with additional bending moment mean diameter mean diameter of branch mean diameter of main body outside diameter outside diameter of branch without allowances outside diameter of main body without allowances modulus of elasticity at design temperature wall thickness required wall thickness of main body with allowances required wall thickness of straight tube with allowances smaller thickness at a thickness change ordered wall thickness of the branch required wall thickness of branch or nozzle without allowances mm2 mm2 mm2 mm2 mm2 mm2 mm2 — — mm — mm — mm mm mm mm mm mm mm mm mm mm mm mm N/mm2 mm mm mm mm mm mm BS EN 12952-1:2015 EN 12952-1:2015 (E) Symbol Description Unit ech required wall thickness of flat end without allowances mm ecs required wall thickness of cylindrical or spherical shells or dished end without allowances mm ech1 ect eh eh’ eh1 emb ems ep erb erh erp ers es ew ewt f fa fA fab faФ fb fB fc fC fd fM fp fs ft' h1 hB , h hc hs K required wall thickness at the bottom of the groove of flat end without allowances required wall thickness of straight tube without allowances ordered wall thickness of flat end required wall thickness of flat end with allowances wall thickness of groove of flat end mean wall thickness of branch, measured value if available mean wall thickness of main body, measured value if available ordered wall thickness of reinforcing pad actual wall thickness of branch or nozzle without allowances actual end thickness of flat end without allowances actual wall thickness of reinforcing pad without allowances actual wall thickness of main body (cylindrical or spherical shell or dished end) without allowances ordered wall thickness of main body or of flat end thickness of fillet weld minimum required wall thickness of the tube at the butt joint design stress effective average stress average direct stress on the ligament effective average stress for the main body/branch transition in the cross-section vertical to the main body axis effective average stress between the centres of two openings staggered by the angle Φ design stress for branch material average transverse stress on the ligament combined stress at supports average shear stress on the ligament effective stress due to internal pressure and the longitudinal component of externally applied loads effective bending stress in longitudinal direction design stress for reinforcing pad material design stress for main body material design stress at test (gauge) pressure depth of counter boring for expanded tubes depth of flat ends (height of skirt) depth of crown of dished ends (with knuckle, without cylindrical skirt) height of cylindrical skirt of dished end material strength value mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa MPa mm mm mm mm MPa BS EN 12952-1:2015 EN 12952-1:2015 (E) Symbol Description Unit Kt’ material strength value at test (gauge) pressure MPa lb0 cylindrical length of branch from the transition zone up to the weld mm l lb1 lb2 lrb lrbi lrp lrs ls0 ls1 P0 P90 pc pd po PS ps1 ps2 pt pt' PΦ Q r R rb rib rik ris, rs ReH ReH tc Rm Rm tc Rm T tc rms ros Rp0,2 10 destination, length measured length of external projection of branch measured length of internal projection of branch effective length of branch effective length of inner projection of set-through branch effective width of reinforcing pad effective length of main body cylindrical length of the main body from the transition zone up of the weld measured length of the many body from the branch or opening to the transition zone centre-to-centre distance of adjacent tubes or adjacent nozzles and openings in axial direction (longitudinal pitch) with the angle Φ = centre-to-centre distance of adjacent tubes or adjacent nozzles and openings in circumferential direction (circumferential pitch) with the angle Φ = 90 calculation pressure design pressure operating pressure maximum allowable pressure allowable (working gauge) pressure allowable (total gauge) pressure for hot-water generators required test (gauge) pressure allowable test (gauge) pressure centre-to-centre distance of adjacent tubes or adjacent nozzles and openings referring to centre of wall of main body without allowances, staggered by the angle Φ axial force on the circumferential butt weld caused by forces inside radius outside radius radius of bend measured to the centre-line of the tube inside radius of branch inside radius of knuckle or relief groove of flat ends inside radius of dished end or cylindrical or spherical shell upper yield strength upper yield strength at temperature tc tensile strength tensile strength at temperature tc average creep rupture strength for T hours at temperature tc mean radius of main body outside radius of dishing of dished end 0,2 % non-proportional proof stress of the respective material grade mm mm mm mm mm mm mm mm mm mm mm N/mm2 N/mm2 N/mm2 N/mm2 N/mm2 N/mm2 N/mm2 N/mm2 mm N mm mm mm mm mm mm MPa MPa MPa MPa MPa mm mm MPa BS EN 12952-1:2015 EN 12952-1:2015 (E) Symbol Description Unit Rp0,2 tc 0,2 % non-proportional proof stress of the respective material grade at temperature tc MPa Rp1,0 tc 1,0 % non-proportional proof stress of the respective material grade at temperature tc MPa Rp1,0 1,0 % non-proportional proof stress of the respective material grade S safety factor St’ safety factor for test (gauge) pressure T minimum specified design lifetime t* decisive temperature of a load cycle tc calculation temperature td design temperature to measured actual operating temperature tor reference temperature tos saturation temperature coincident with the design pressure tR thickness of ruling section of forgings TS maximum/minimum allowable temperature u departure from circularity (DFC) v minimum efficiency vall allowable efficiency coefficient for branches or openings vb efficiency coefficient for isolated branches or openings vm efficiency coefficient for adjacent branches or openings vm2 efficiency coefficient in longitudinal direction for adjacent branches vm3 vNDE or vZfP β20,t δ5 linear coefficient of thermal expansion from 20 °C to temperature angle of lines connecting the centres of two openings, related to body axis Φb angle of centre distance for adjacent nozzles on a spherical shell ψ, ψl NOTE weld strength reduction factor at filled weld elongation at fracture (gauge length ratio = 5) Φ ψ1, ψc efficiency coefficient in diagonal direction for adjacent branches inclined angle of branch of the axis of the branch to the axis of the shell inclined angle of branch of the axis of the branch to the tangent of the shell N/mm2 = MN/m2 = MPa MPa — — h °C °C °C °C °C °C mm °C % — — — — — — — -6 -1 10 K % degree rad degree degree Responsibilities 6.1 Purchaser The purchaser shall be responsible for furnishing the manufacturer with a specification of the normal working conditions of the boiler plant (see also guides of procurement EN 45510-3-1 and EN 45510-3-3 where applicable), together with details of any transient and/or adverse conditions under which the boiler plant is required to operate and of any special requirements to facilitate in-service inspection 11 BS EN 12952-1:2015 EN 12952-1:2015 (E) 6.2 Manufacturer The manufacturer shall be responsible for the completeness and accuracy of all design calculations and for compliance with all applicable requirements of this standard for the boiler assembly Manufacturers shall ensure that the execution of the provisions of this European Standard is entrusted to appropriately qualified and experienced personnel Duties carried out by other responsible authorities shall not absolve the manufacturer from his responsibility for compliance with the applicable requirements of this standard The offices, workshops and sites associated with the design and construction of water-tube boilers shall be properly equipped and shall have appropriate provisions for all the inspection and testing specified in EN 12952-6:2011 Manufacturing and other procedures shall be adequate and manufacturing personnel shall be competent and properly qualified for their assigned tasks The manufacturer shall be competent to manufacture the boiler in accordance with this standard (see EN 12952-5:2011, Annex F) Design/type appraisal of pressure parts The manufacturer is required to declare that the technical design specification and supporting documentation is in compliance with the requirements of this standard Because of the wide range of types of water-tube boiler plant that can be designed and manufactured in accordance with this standard, it has been recognized that it is not possible to cover all the combinations of situations that might arise This might be due to the normal lag in time scale which naturally exists between standardization and advancing technology In order not to inhibit progress in these circumstances, general guidance has been given within this European Standard to cover such situations The specific requirements shall be determined by the manufacturer on a case-by-case basis according to the particular design and manufacturing details involved, ensuring, in all cases, the safety of the boiler will not be impaired It has also been recognized that during the manufacturing stages, unexpected factors might arise which require the introduction of design modifications and/or manufacturing concessions resulting in deviations from the specified requirements included at the initial design/type appraisal stage Such deviations are permitted by this standard where it can be established that the safety and required function of the component are not impaired Any such deviations shall be included in the technical documentation and form part of the manufacturer's data dossier 12 BS EN 12952-1:2015 EN 12952-1:2015 (E) Annex A (informative) Significant technical changes between this European Standard and the previous edition Clause/Paragraph/Table/Figure General / Scope 1.1 / General 1.2 / Boiler assembly Change The complete document was restructured The revision of EN 12952-1:2001 was dedicated to fulfill the European Guidelines 3/4, 8/4 and 8/11 related to the essential safety requirements of Annex I of the PED regarding the minimum extend of boiler assembly subject to a global conformity assessment procedure and the extend as well as performance of a hazard analysis The Scope was revised / Normative references Normative references were updated / Interdependency of the parts of the series New clause was added / Terms and definitions / Symbols and abbreviations Annex A / Guidance in the use of the conformity assessment procedures Annex ZA / Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU Definitions in line with the terms used for shell boilers in EN 129531 Table 5-1 listing the symbols and abbreviations was updated Annex was deleted and replaced by a new informative annex listing the significant technical changes between this European Standard and the previous edition Annex was revised NOTE The technical changes referred to include the significant technical changes from the revised EN but it is not an exhaustive list of all modifications from the previous version 13 BS EN 12952-1:2015 EN 12952-1:2015 (E) Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide a means of conforming to Essential Requirements of the New Approach Pressure Equipment Directive 2014/68/EU Once this standard is cited in the Official Journal of the European Union under that Directive and has been implemented as a national standard in at least one Member State, compliance with the clauses of this standard given in Table ZA.1 confers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations Table ZA.1 — Correspondence between this European Standard and Directive 2014/68/EU on Pressure Equipment Clause(s)/subclause(s) of this EN 12952–1 Clause Essential Safety Requirements (ESRs) of Directive 2014/68/EU on Pressure Equipment Annex I Qualifying remarks/Notes 1.1 General WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling within the scope of this standard 14 BS EN 12952-1:2015 EN 12952-1:2015 (E) Bibliography [1] [2] [3] [4] [5] [6] [7] Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment EN 12952-7, Water-tube boilers and auxiliary installations —Part 7: Requirements for equipment for the boiler EN 12952-8, Water-tube boilers and auxiliary installations — Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler EN 12952-9, Water-tube boilers and auxiliary installations — Part 9: Requirements for firing systems for pulverized solid fuels for the boiler EN 12952-16, Water-tube boilers and auxiliary installations — Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler EN 45510-3-1, Guide for procurement of power station equipment — Part 3-1: Boilers - Water tube boilers EN 45510-3-3, Guide for procurement of power station equipment — Part 3-3: Boilers - Boilers with fluidized bed firing 15 This page deliberately left blank This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated 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