bs en 12952 1 2001 water tube boilers p1 general

BRITISH STANDARD BS EN 12952-1:2001

Water-tube boilers and auxiliary installations

Part 1: General

The European Standard EN 12952-1:2001 has the status of a British Standard

ICS 27.040

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy

Not for ResaleNo reproduction or networking permitted without license from IHS

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BS EN 12952-1:2001

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 Strategy Committee on 29 April 2002

BSI 29 April 2002

ISBN 0 580 39635 5

National forewordThis British Standard is the official English language version of EN 12952-1:2001. It partially supersedes BS 1113:1999 which will be withdrawn when Parts 1, 2, 3, 5, 6, 7, 10 and 11 of BS EN 12952 are all published.The UK participation in its preparation was entrusted to Technical Committee PVE/2, Water-tube boilers, which has the responsibility to:

A list of organizations represented on this committee can be obtained on request to its secretary.Additional informationThe United Kingdom voted against the acceptance of this European Standard at the Formal Vote stage. The principal UK objections were as follows:

a) There is no reference in the EN foreword to CR 12952-17, Water-tube boilers and auxiliary installations Part 17: Guidelines for the involvement of an inspection body independent of the manufacturer. It was intended that Annex A of this part of EN 12952 be transferred to Part 17 otherwise Part 1 would be rejected by the European Commission and would not be harmonized and published in the Official Journal of the European Communities.b) CEN/TC 269 passed a resolution that Parts 1, 2, 3, 5, 6 and 7 be published as a package necessary for the design, construction and safety of water-tube boilers but no mention of this is given in the EN foreword.c) CEN/TC 269 agreed to remove reference to coil boilers from EN 12953 and include them in 1.1 of the scope of this standard but no reference has been made to coil boilers.d) 1.2 of the scope is entitled Boiler assembly however it also includes other plant and auxiliary installations.e) 1.3 of the scope lists items that are not covered by any of the parts of EN 12952 but there is no mention of this in the subclause.f) The term chemical recovery boilers (black liquor boilers) is referred to in several parts of EN 12952. It would have been preferable to include the definition of the term in this general Part 1, however it is only defined in EN 12952-5:2001, E.2. It is defined as a pulping chemical recovery process unit where the organic materials are burned while the recovered chemicals are reduced and drained as molten smelt from the furnace bottom and the heat released is used for steam generation.

Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue.A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.

aid enquirers to understand the text;

present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;

monitor related international and European developments and promulgate them in the UK.

Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a back cover.The BSI copyright date displayed in this document indicates when the document was last issued.

Amendments issued since publication

Amd. No. Date Comments



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EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORM

EN 12952-1

December 2001

ICS 27.040

English version

Water-tube boilers and auxiliary installations - Part 1: General

Chaudires tubes d'eau et installations auxiliaires - Partie1: Gnralits

Wasserrohrkessel und Anlagenkomponenten - Teil 1:Allgemeines

This 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 STANDARDIZATIONC O M I T E U R O P E N D E N O R M A LI S A T I O NEUR OP IS C HES KOM ITEE FR NOR M UNG

Management Centre: rue de Stassart, 36 B-1050 Brussels

2001 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.

Ref. No. EN 12952-1:2001 E



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EN 12952-1:2001 (E)

ContentsPage

Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . 41.1 General . . . . . . . . . . . . . . . . . . . . . . . . . 41.2 Boiler assembly . . . . . . . . . . . . . . . . . . . 41.3 Other plant equipment . . . . . . . . . . . . . . . 41.4 Exclusions . . . . . . . . . . . . . . . . . . . . . . . 5

2 Normative references . . . . . . . . . . . . . . 5

3 Definitions . . . . . . . . . . . . . . . . . . . . . . . 53.1 Purchaser . . . . . . . . . . . . . . . . . . . . . . . . 53.2 Manufacturer . . . . . . . . . . . . . . . . . . . . . . 63.3 Designer . . . . . . . . . . . . . . . . . . . . . . . . . 63.4 Material supplier . . . . . . . . . . . . . . . . . . . 63.5 Material producer . . . . . . . . . . . . . . . . . . 63.6 Responsible authority . . . . . . . . . . . . . . . 6

4 Symbols and abbreviations . . . . . . . . . 7

Page

5 Responsibilities . . . . . . . . . . . . . . . . . . . 115.1 Responsibility of the purchaser . . . . . . . . . 115.2 Responsibility of the manufacturer . . . . . . 115.3 Responsible authority . . . . . . . . . . . . . . . 11

6 Interpretations . . . . . . . . . . . . . . . . . . . . 11

7 Design/type appraisal of pressure parts 11

Annex A (informative) Guidance in the use of theconformity assessment procedures . . . . . . 13

A.1 General . . . . . . . . . . . . . . . . . . . . . . . . . 13A.2 Principles for the application of the PED . . 14

Annex ZA (informative) Clauses of thisEuropean Standard addressing essentialsafety requirements or other provisions ofthe Pressure Equipment Directive . . . . . . . 17

2Copyright British Standards Institution Reproduced by IHS under license with BSI - Uncontrolled Copy


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EN 12952-1:2001 (E)

Foreword

This document EN 12952-1:2001 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 June 2002, and conflicting national standards shall be withdrawn at the latest byJune 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 Pressure Equipment Directive see informative annex ZA, which is an integral Part of thisdocument.

According to the CEN/CENELEC Internal Regulations, the national satndards organizations of the following countriesare bound to implement this European Standard : Austria, Belgium, Czech Republic, Denmark, Finland, France,Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerlandand the United Kingdom.

The European Standard series EN 12952 concerning water-tube boilers and auxilliary installations consists of thefollowing parts:

Part 1: GeneralPart 2: Materials for pressure parts of boilers and accessoriesPart 3: Design and calculation for pressure partsPart 4: In-service boiler life expectancy calculationsPart 5: Workmanship and construction of pressure parts of the boilerPart 6: Inspecting during construction, documentation and marking of pressure parts of the boilerPart 7: Requirements for equipment for the boilerPart 8: Requirements for firing systems for liquid and gaseous fuels for the boilerPart 9: Requirements for firing systems for pulverized solid fuels for the boilerPart 10: Requirements for safeguards against excessive pressurePart 11: Requirements for limiting devices, and safety circuits of the boiler and accessoriesPart 12: Requirements for boiler feedwater and boiler water qualityPart 13: Requirements for flue gas cleaning systemsPart 14: Requirements for flue gas DENOX-systemsPart 15: Acceptance testsPart 16: Requirements for grate and fluidized bed firing systems for solid fuels for the boiler

Although these Parts may be obtained separately, it should be recognised that the Parts are inter-dependent. Assuch, the design and manufacture of boilers requires the application of more than one Part in order for therequirements of the European Standard to be satisfactorily fulfilled.

NOTE 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.

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EN 12952-1:2001 (E)

1 Scope

1.1 General

This 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 assembly

For 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 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 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.



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EN 12952-1:2001 (E)

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 including electrical boilers;

c) nuclear primary circuits, the failure of which can cause an emission of radioactivity.

2 Normative references

This 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 definitions

For 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 manufacturer

3.2manufacturerindividual 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 764-3:1999

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EN 12952-1:2001 (E)

3.3designerindividual or organization that, on behalf of the manufacturer, carries out the design of the boiler plant. The designerdetermines the shape, dimensions and thicknesses of the boiler plant components, selects the materials and detailsthe methods of construction and testing

3.4material supplierindividual 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

3.5material manufacturerindividual or organization that produces basic materials for the fabrication of boiler plant components or prefabricatedstandardized parts

3.6responsible authoritythis standard identifies the involvement of competent organizations which are independent of the manufacturer. Suchorganizations may be notified bodies, recognized third-party organizations or user inspectorates. For the purpose ofthis standard these organizations have been collectively termed responsible authorities (RA)NOTE 1 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.



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EN 12952-1:2001 (E)

4 Symbols and abbrevations

For the purposes of this European Standard, the general symbols and abbreviations given in table 4-1 and table 4-2shall apply.

Table 4-1 Symbols

Symbol Description Unit

A area mm2

Af effective cross-sectional area without allowances mm2

Afb effective cross-sectional area of branch mm2

Afp effective cross-sectional area of reinforcing ring mm2

Afs effective cross-sectional area of body mm2

Ap pressurized area without allowances mm2

Apb pressurized area referred to branch mm2

Aps pressurized area referred to body mm2

C shape factor C1 shape factor for unstayed walls, ends or plates C2 shape factor for rectangular and elliptical plates C3 shape factor for flat plates with openings c1 minus tolerance on the ordered nominal wall thickness mmc2 allowance for metal wastage mmDb mean diameter of flat ends with knuckle or design diameter of flat cover plates mmDL bolt circle diameter mmd diameter of tube hole (if applicable in the condition after metal wastage) mmdi inside diameter mmdib inside diameter of branch without allowances mmdis inside diameter of main body (cylindrical shell, spherical shell or dished end) without

allowancesmm

dm mean diameter mmdo outside diameter mmdob outside diameter of branch without allowances mmdos outside diameter of main body without allowances mmds stay diameter mmE modulus of elasticity at design temperature N/mm2

e wall thickness mmeb ordered wall thickness of the branch mmecb required wall thickness of branch or nozzle without allowances mmech required wall thickness of flat end without allowances mmecs required wall thickness of cylindrical or spherical shells or dished end without

allowancesmm

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EN 12952-1:2001 (E)

Table 4-1 (continued)


ect required wall thickness of straight tube without allowances mm

eh ordered wall thickness of flat end mm

eh1 wall thickness of relief groove mm

eh' required wall thickness of flat end with allowances mm

ep ordered wall thickness of reinforcing pad mm

erb actual wall thickness of branch or nozzle without allowances mm

erh actual wall thickness of flat end without allowances mm

erp actual wall thickness of reinforcing pad without allowances mm

ers actual wall thickness of main body (cylindrical or spherical shell or dished end)without allowances

mm

ert actual tube wall thickness without allowances mm

es ordered wall thickness of main body mm

es' required wall thickness of main body mm

et ordered tube wall thickness mm

et' required wall thickness of straight tube with allowances mm

f design stress N/mm2

ft' design stress at test (gauge) pressure N/mm2

fa effective average stress N/mm2

fa F effective average stress between the centres of two openings N/mm2

fb design stress for branch material N/mm2

fc combined stress at supports N/mm2

fd effective stress in longitudinal direction due to internal pressure N/mm2

fp design stress for reinforcing ring material N/mm2

fM effective bending stress in longitudinal direction N/mm2

fs design stress for main body material N/mm2

f1 effective tangential stress due to internal pressure N/mm2

hB depth of flat ends mm

hc depth of crown of dished ends (with knuckle, without cylindrical skirt) mmhf height of manhole ring mm

hs height of cylindrical skirt of dished end mm



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EN 12952-1:2001 (E)



K design strength value N/mm2

Kt' design strength value at test (gauge) pressure N/mm2

lb0 cylindrical length of branch from the transition zone up to the weld mm

lb1 measured length of external projection of branch mmlb2 measured length of internal projection of branch mmlrb effective length of branch mm

lrbi effective length of inner projection of set-through branch mmlrp effective width of reinforcing ring mm

lrs effective length of main body mm

ls0 cylindrical length of the main body from the transition zone up of the weld mm

pc calculation pressure N/mm2

pd design pressure N/mm2

PS maximum allowable pressure N/mm2

ps1 allowable (working gauge) pressure N/mm2

ps2 allowable (total gauge) pressure for hot-water generators N/mm2

pt test (gauge) pressure N/mm2

P0 centre-to-centre distance of adjacent tubes in axial direction (longitudinal pitch) withF = 0

mm

PF

centre-to-centre distance of adjacent openings, staggered by the angle F referring tocentre of wall without allowances

mm

Q force NRm minimum tensile strength of the grade of material concerned at room temperature N/mm2

RmTtc average creep rupture strength for T hours at temperature tc N/mm2

Rp0,2tc minimum yield strength (0,2 % proof stress) of the respective material grade attemperature tc

N/mm2

Rp1,0tc minimum value of 1,0 % proof stress of the respective material grade at temperaturetc

N/mm2

rib inside radius of branch mm

rik inside radius of knuckle or relief groove of flat ends mm

ris inside radius of dished end or cylindrical or spherical shell mm

rms mean radius of shell mm

ros outside radius of dishing of dished end mm

S safety factor

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EN 12952-1:2001 (E)



St' safety factor for test (gauge) pressure T design lifetime h

tc calculation temperature C

td design temperature C

to operating temperature C

tor reference temperature C

tos saturation temperature coincident with the design pressure C

TS maximum/minimum allowable temperature C

u departure from circularity (DFC) %vall allowable efficiency coefficient for branches or openings

vb efficiency coefficient for isolated branches or openings

vm ligament efficiency for adjacent branches or openings VNDE weld strength reduction factor

y factor for Y-branches

F

angle of lines connecting the centres of two openings, related to body axis degree

F b angle of centre distance for adjacent nozzles on a spherical shell radd 5 elongation at fracture (gauge length ratio = 5) %Y

inclined angle of branch related to body axis degree

NOTE 1 N/mm2 = 1 MN/m2 = 1 MPa

Table 4-2 Abbreviations

Abbreviation Description

DFC Departure from circularity

EAM European approval of material

EC European Commission

EMDS European material data sheet

NDE Non-destructive examination

PBHT Post-bend heat treatment

PED Pressure equipment directive

PWHT Post-weld heat treatment

OJEC Official Journal of the European Communities

RA Responsible authority

US Ultrasonic



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EN 12952-1:2001 (E)

5 Responsibilities

5.1 Purchaser

The purchaser shall be responsible for furnishing the manufacturer with a specification of the normal workingconditions 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 operateand of any special requirements to facilitate in-service inspection.

5.2 Manufacturer

The manufacturer shall be responsible for the completeness and accuracy of all design calculations and forcompliance 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 toappropriately qualified and experienced personnel.

Duties carried out by other responsible authorities shall not absolve the manufacturer from his responsibility forcompliance with the applicable requirements of this standard. Guidance in the use of the conformity assessmentprocedure is given in annex A.

The offices, workshops and sites associated with the design and construction of water-tube boilers shall be properlyequipped and shall have appropriate provisions for all the inspection and testing specified in prEN 12952-6:1998.Manufacturing and other procedures shall be adequate and manufacturing personnel shall be competent andproperly qualified for their assigned tasks.

The manufacturer shall be competent to manufacture the boiler in accordance with this standard (see annex F ofEN 12952-5:2001).

5.3 Responsible authority

The responsibility of the responsible authority is indicated in annex A of prEN 12952-6:1998.

6 Interpretations

If any ambiguity is found or doubt arises as to the meaning or effect of any normative part of this European Standardor as to whether anything ought to be done or omitted to be done in order that this European Standard should becomplied with in full, the question shall be referred to Committee CEN/TC 269.

Findings or rulings of the Committee upon all enquiries, including matters of interpretation, which are considered bythe Committee to be of sufficient importance that both the enquiry and the reply be made public as soon as possible,shall be published in an enquiry-reply format for inclusion in an interpretation sheet to the European Standard.

NOTE After taking into account any public comment thereon, interpretation sheets may be incorporated, as appropriate, into theEuropean Standard as amendments which will form part of the next convenient update (see document BT N 5103).

7 Design/type appraisal of pressure parts

The manufacturer is required to declare that the technical design specification and supporting documentation is incompliance with the requirements of this standard.

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EN 12952-1:2001 (E)

Because of the wide range of types of water-tube boiler plant that can be designed and manufactured in accordancewith this standard, it has been recognized that it is not possible to cover all the combinations of situations that mightarise. This might be due to the normal lag in time scale which naturally exists between standardisation andadvancing technology. In order not to inhibit progress in these circumstances, general guidance has been givenwithin this European Standard to cover such situations. The specific requirements shall be determined by themanufacturer 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 recognised that during the manufacturing stages, unexpected factors might arise which require theintroduction of design modifications and/or manufacturing concessions resulting in deviations from the specifiedrequirements included at the initial design/type appraisal stage. Such deviations are permitted by this standard whereit can be established that the safety and required function of the component are not impaired. Any such deviationsshall be included in the technical documentation and form part of the manufacturer's data dossier.



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EN 12952-1:2001 (E)

Annex A(informative)

Guidance in the use of the conformity assessment procedures

A.1 General

A.1.1 Application of the PED

The Pressure Equipment Directive (PED) requires all pressure equipment falling within its scope to have its designand manufacture assessed for conformity in accordance with a series of conformity assessment modules seeArticle 10 of the PED. These modules are described in detail in Annex III of the PED to which reference must bemade in order to ensure compliance. The following rsum is given for guidance purposes only.

NOTE This annex deals with the conformity assessment of pressure equipment as part of the boiler assembly, with regard toessential requirements of the PED. This does not deal with the conformity assessment of other pressure equipments included inthe boiler plant!

A.1.2 Rsum of the modules described in the PED

Module Description of the main features

A Made under the manufacturer`s own responsibilityA1 The manufacturer`s own responsibility but final assessment is monitored by the Notified Body.

B The manufacturer establishes a EC Type Examination Certificate with the Notified Body.B1 The manufacturer establishes a EC Design Examination Certificate with the Notified Body.

C1 Made to conform to a EC Type Examination Certificate with manufacture monitored by the NotifiedBody.

D The manufacturer uses an approved Quality System (e.g. EN ISO 9001 type) and conforms to eithera EC Design Examination or EC Type Examination Certificate.

D1 The manufacturer uses an approved Quality System (e.g. EN ISO 9001 type), and manufactureswithout the use of a EC Design Examination or EC Type Examination Certificate.

E The manufacturer uses an approved Quality System (e.g. EN ISO 9001 type) and conforms to a ECType Examination Certificate.

E1 The manufacturer uses an approved Quality System (e.g. EN ISO 9001 type), without a EC TypeExamination Certificate.

F Made to either a EC Type or Design Examination Certificate with each pressurised equipment beingexamined by the Notified Body.

G The manufacturer selects the notified body. The Notified Body carries out the examinations on eachpressurised equipment.

H The manufacturer uses an approved Quality System (e.g. EN ISO 9001 type) for each pressurisedequipment.

H1 The manufacturer uses an approved Quality System (e.g. EN ISO 9001 type). The Notified Bodyissues a EC Design Examination Certificate and takes part in the final assessment of the pressurisedequipment.

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EN 12952-1:2001 (E)

A.1.3 Selection of modules

The choice of module depends on the hazard category in which the pressurised equipment or boiler assembly isclassified. These categories are defined in Article 10 of the PED and further elaborated in Annex II of the PED.

Based on the operating parameters of the equipment, the manufacturer is required by the PED to determine thehazard category in which the equipment will operate. In choosing the module the manufacturer shall ensure that hisorganisation possess the system of controls required by the PED for manufacture within that module.

A.2 Principles for the application of the PED

A.2.1 Status of this standard

Water-tube boiler components are covered by article 3 section 1.2 of the PED and water-tube boiler assemblies arecovered by article 3 section 2.1 of the PED, with the hazard categories being defined in annex II Table 5. Thetext of the water-tube boiler standard includes all the rules necessary to ensure that water-tube boiler and assemblycomponents when designed, manufactured and inspected in accordance with its provisions will, when beingoperated, perform safely in accordance with the essential requirements of the PED.

A.2.2 Involvement of a Notified Body

Modules concerned with the manufacture of water-tube boiler components and water-tube boiler assemblies mayrequire the involvement of a Notified Body. The choice of Notified Body is the responsibility of the manufacturer.

A.2.3 Module selection for water-tube boiler components

Considering the pressures and volumes applicable to water-tube boiler components, table 1 to 9 in annex II of thePED should be consulted to determine the hazard category. The modules permitted for these hazard categories areincluded in annex III of the PED.

NOTE A manufacturer may choose to adopt a higher category than indicated by annex II.

A.2.4 Modules selection for water-tube boiler assemblies

The assessment of integration of the various components of the assembly should be determined by the highestcategory applicable to the component concerned other than that applicable to any safety accessories.

Considering the pressure and volumes normally applicable to water-tube boiler assemblies, table 5 in annex II of thePED indicates that hazard category IV is applicable.

A.2.5 Guidance on modules

Guidance on modules applicable to hazard category IV are given below. Reference should be made to annex II ofthe PED for precise details.

MODULE B EC TYPE EXAMINATION

A Notified Body confirms that a representative example of the production envisaged meets the applicableprovisions of the PED.

Technical documentation is prepared covering the design, manufacture and operation of the boiler componentor the boiler assembly. In addition, applicable information covering qualification and approvals shall be providedfor the joining and NDE procedures to be used.



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EN 12952-1:2001 (E)

The technical documentation shall be retained for a minimum of ten years.

The Notified Body issues a EC Type Examination Certificate which is valid for ten years and is renewable.

The manufacturer shall advise the Notified Body of all modifications to the component which shall be recordedin the technical documentation.

MODULE D PRODUCTION QUALITY ASSURANCE

The manufacturer shall operate a production Quality System (e.g. EN ISO 9001) approved by a Notified Body.

The manufacturer or his representative shall confirm by written declaration that the boiler component or theboiler assembly meets the applicable requirements of the PED and conforms to the requirements of a:

EC Type Examination Certificate with respect to Module B.

The Notified Body carries out surveillance of the Quality System by scheduled and unscheduled visits.

The manufacturer or his representative affixes the CE mark and the identification number of the Notified Bodyresponsible for the surveillance.

The technical documentation and EC Type Examination Certificate shall be kept for a minimum of ten years.

MODULE F PRODUCT VERIFICATION

The manufacturer or his representative shall ensure and declare that the boiler component or boiler assemblymeets the applicable requirements of the Directive and conforms to the requirements of a:

EC Type Examination Certificate with respect to Module B.

The Notified Body examines and tests every component or the boiler assembly including requirements for:

Qualification and approvalsMaterialsFinal Proof Test

The manufacturer prepares a Declaration of Conformity which shall be kept for a minimum of ten years.

The manufacturer or his representative affixes the CE mark and the identification number of the involved NotifiedBody.

MODULE G EC UNIT VERIFICATION

The manufacturer shall ensure and declare that the boiler component or the boiler assembly meets theapplicable requirements of the PED.

The manufacturer shall use a Notified Body of his choice for unit verification and submit for approval technicaldocumentation which shall include:

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EN 12952-1:2001 (E)

Test reportsManufacturing and test proceduresQualification and approvals data for joining and NDE

The Notified Body shall verify the technical documentation and perform appropriate tests as set out in the watertube boiler standard. In addition, the Notified Body shall carry out the final inspection of the component, or theboiler assembly including the proof testing.

The Notified Body shall prepare a Certificate of Conformity which shall be kept for a minimum of ten years.

The manufacturer or his representative affixes the CE mark to the component or the boiler assembly. TheNotified Body ensures its identification number is also affixed.

MODULE H1 FULL QUALITY ASSURANCE WITH DESIGN EXAMINATION AND SPECIAL SURVEILLANCEOF THE FINAL TEST

The manufacturer shall operate a quality system of the type EN ISO 9001 approved by a Notified Body of hischoice which covers design, manufacture, inspection and testing.

The manufacturer shall lodge an application for examination of the design with the Notified Body.

The Notified Body issues a EC Design Examination Certificate confirming that the design meets the provisionsof the PED and carries out increased surveillance during the final assessment stages of the production.

The manufacturer shall confirm by written declaration that the boiler component or the boiler assembly meetsthe applicable requirements of the PED.

The Notified Body makes scheduled and unscheduled visits and examines the Quality System including:

Quality System documentationQuality Records for designQuality records for manufacture

The manufacturer or his representative affixes CE mark and the identification number of the Notified Bodyresponsible for the surveillance.

The manufacturer shall keep all technical and quality documentation for a minimum period of ten years.



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EN 12952-1:2001 (E)

Annex ZA(informative)

Clauses of this European Standard addressing essential safety requirements or other provi-sions of the Pressure Equipment Directive

This European Standard has been prepared under a mandate given to CEN by the European Commission and theEuropean Free Trade Association and supports essential safety requirements of the Pressure EquipmentDirective 97/23/EC with regard to general requirements for water-tube boilers.

WARNING: Other requirements and other EU Directives may be applicable to the product(s) falling within the scopeof this standard.

The following clauses of this standard given in table ZA-1 are likely to support requirements of the PressureEquipment Directive 97/23/EC:

Table ZA-1 Comparison between the Pressure Equipment Directive 97/23/EC andEN 12952-1 with respect to general requirements for water-tube boilers

EN 12952-1harmonised

clausesContent

Pressure EquipmentDirective 97/23/EC

Annex I

1.1 Ensurance of safety in service, General 1.1

Compliance with the clauses of this standard provides one means of conforming with the specific essentialrequirements of the Directive concerned and associated EFTA regulations.

Bibliography

[1] prEN 12952-7, Water-tube boilers and auxiliary installations Part 7: Requirements for equipment for the boiler.

[2] prEN 12952-8, Water-tube boilers and auxiliary installations Part 8: Requirements for firing systems for liquidand gaseous fuels for the boiler.

[3] prEN 12952-9, Water-tube boilers and auxiliary installations Part 9: Requirements for firing systems forpulverized solid fuel for the boiler.

[4] prEN 12952-16, Water-tube boilers and auxiliary installations - Part 16: Requirements for fluidized bed and gratefiring systems for solid fuels for the boiler.

[5] EN 45510-3-1, Guide for procurement of power station equipment - Part 3-1: Boilers - Water tube boilers

[6] EN 45510-3-3, Guide for procurement of power station equipment - Part 3-3: Boilers - Boilers with fluidized bedfiring.

[7] EN ISO 9001, Quality management systems Requirements (ISO 9001:2000).

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BS EN 12952-1:2001

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bs en 12952 1 2001 water tube boilers p1 general

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