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EN 12953-4:2018

(Main)

Shell boilers - Part 4: Workmanship and construction of pressure parts of the boiler

Shell boilers - Part 4: Workmanship and construction of pressure parts of the boiler

This European Standard specifies requirements for the workmanship and construction of shell boilers as defined in EN 12953-1.
NOTE 1   For other components such as water tube walls, see the EN 12952 series.
NOTE 2   For economizers and superheaters, see EN 12953-4 or EN 12952-5.

Großwasserraumkessel - Teil 4: Verarbeitung und Bauausführung für drucktragende Kesselteile

Diese Europäische Norm legt Anforderungen für die Verarbeitung und Bauausführung von in EN 12953 1 definierten Großwasserraumkesseln fest.
ANMERKUNG 1   Für andere Bauteile wie Wasserrohrwände, siehe Normenreihe EN 12952.
ANMERKUNG 2   Für Vorwärmer und Überhitzer, siehe EN 12953 4 oder EN 12952 5.

Chaudières à tubes de fumée - Partie 4 : Fabrication et construction des parties sous pression des chaudières

La présente Norme européenne spécifie les exigences de fabrication et de construction des chaudières à tubes de fumée telles que définies dans l’EN 12953-1.
NOTE 1   Pour les autres composants, tels que les parois à tubes d’eau, voir la série des EN 12952.
NOTE 2   Pour les économiseurs et les surchauffeurs, voir l'EN 12953-4 ou l'EN 12952-5.

Mnogovodni kotli - 4. del: Izdelava in izvedba tlačno obremenjenih delov kotla

Ta del tega evropskega standarda velja za mnogovodne kotle, kot je opredeljeno v standardu prEN 12953-1. Ta del standarda določa pravila za izdelavo in konstrukcijo mnogovodnih kotlov.

General Information

Status
Published
Publication Date
27-Mar-2018
Withdrawal Date
29-Sep-2018
ICS
27.060.30 - Boilers and heat exchangers
27.100 - Power stations in general
Technical Committee
CEN/TC 269 - Shell and water tube boilers
Drafting Committee
CEN/TC 269/WG 2 - Shell boilers
Current Stage
9060 - Closure of 2 Year Review Enquiry - Review Enquiry
Start Date
02-Sep-2023
Completion Date
02-Sep-2023
Directive
2014/68/EU - 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
97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
Mandate
M/071 - Mandate to CEN for standardization in the field of Pressure equipment
Ref Project
SIST EN 12953-4:2018 - Shell boilers - Part 4: Workmanship and construction of pressure parts of the boiler

Relations

Replaces
EN 12953-4:2002 - Shell boilers - Part 4: Workmanship and construction of pressure parts of the boiler
Effective Date
08-Jun-2022

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SLOVENSKI STANDARD
01-maj-2018
1DGRPHãþD
SIST EN 12953-4:2002
0QRJRYRGQLNRWOLGHO,]GHODYDLQL]YHGEDWODþQRREUHPHQMHQLKGHORYNRWOD
Shell boilers - Part 4: Workmanship and construction of pressure parts of the boiler
Großwasserraumkessel - Teil 4: Verarbeitung und Bauausführung für drucktragende
Kesselteile
Chaudières à tubes de fumée - Partie 4 : Fabrication et construction des parties sous
pression des chaudières
Ta slovenski standard je istoveten z: EN 12953-4:2018
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 12953-4
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 27.060.30 Supersedes EN 12953-4:2002
English Version
Shell boilers - Part 4: Workmanship and construction of
pressure parts of the boiler
Chaudières à tubes de fumée - Partie 4 : Fabrication et Großwasserraumkessel - Teil 4: Verarbeitung und
construction des parties sous pression des chaudières Bauausführung für drucktragende Kesselteile
This European Standard was approved by CEN on 6 December 2017.

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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12953-4:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols . 7
5 General requirements . 7
5.1 General . 7
5.2 Traceability . 8
5.2.1 General . 8
5.2.2 Material . 8
5.2.3 Welding . 8
5.2.4 Inspection (NDT) . 8
5.3 Cylindrical shells . 9
5.4 Tell-tale holes . 11
5.5 End plates and tube plates . 11
5.6 Plain tubes and stay tubes . 11
5.7 Manhole frames and openings . 12
5.7.1 Jointing flanges . 12
5.7.2 Openings for access and inspection . 12
5.8 Connections for accessories . 13
5.8.1 Accessories . 13
5.8.2 Set-in flange and set-on flange . 13
5.8.3 Flanges on nozzles . 13
5.8.4 Bolting . 14
5.9 Cylindrical furnaces . 14
5.10 Water-cooled reversal chamber . 16
5.11 Stays . 16
5.11.1 Bar stays . 16
5.11.2 Girder stays . 17
5.11.3 Tube stays . 17
5.11.4 Non-perpendicular bar stays or tube stays . 17
5.12 Design of welded joints . 17
5.12.1 Weld deposition . 17
5.12.2 Weld crosses . 17
5.12.3 Types of welds . 18
5.12.4 Weld preparations . 19
5.12.5 Welding plates of unequal thickness . 19
5.13 Openings in or adjacent to welds . 19
5.14 Fabrication . 19
5.14.1 General . 19
5.14.2 Welding . 19
5.14.3 Cutting, fitting and alignment . 20
5.14.4 Longitudinal seams . 21
5.14.5 Circumferential seams . 21
5.14.6 Surface condition before welding . 21
5.14.7 Middle line alignments . 21
5.14.8 Surface alignment tolerances . 22
5.14.9 Miscellaneous welding requirements . 23
5.14.10 Repair of weld defects . 24
5.15 Post-weld heat treatment (PWHT) and other heat treatments . 24
5.15.1 General . 24
5.15.2 Material thickness . 24
Annex A (normative) Typical welds for shell boilers . 27
Annex B (informative) Gaskets for closing systems of access and inspection openings . 32
Annex C (informative) Significant technical changes between this European Standard and
the previous edition . 33
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU aimed to be covered . 34
Bibliography . 35

European foreword
This document (EN 12953-4:2018) 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 September 2018, and conflicting national standards
shall be withdrawn at the latest by September 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 12953-4:2002.
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(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
The informative Annex C lists the significant technical changes between this European Standard and the
previous edition.
EN 12953, 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 boilers;
— Part 8: Requirements for safeguards against excessive pressure;
— Part 9: Requirements for limiting devices of the boiler and accessories;
— Part 10: Requirements for feedwater and boiler water quality;
— Part 11: Acceptance tests;
— Part 12: Requirements for grate firing systems for solid fuels for the boiler;
— Part 13: Operating instructions;
— Part 14: Guideline for involvement of an inspection body independent of the manufacturer [CR 12953-
14].
Although these parts can be obtained separately, the parts are interdependent. As such, the design and
manufacture of shell boilers requires the application of more than one part in order for the
requirements of the standard to be satisfactorily fulfilled.
NOTE A “Boiler Help
...

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1.1   General
This European Standard applies to shell boilers with volumes in excess of 2 litres for the generation of steam and/or hot water at a maximum allowable pressure greater than 0,5 bar and with a temperature in excess of
110 °C.
The purpose of this European Standard is to ensure that the hazards associated with the operation of shell boilers are reduced to a minimum and that adequate protection is provided to contain the hazards that still prevail when the shell boiler is put into service. This protection will be achieved by the proper application of the design, manufacturing, testing and inspection methods and techniques incorporated in the various parts of this European Standard. Where appropriate, adequate warning of residual hazards and the potential for misuse are given in the training and operating instructions and local to the equipment concerned (see EN 12953-7 and EN 12953-8).
It is the manufacturer's responsibility, in addition to complying with the requirements of this standard, to take into consideration special measures which could be necessary in order to achieve by manufacturing the required level of safety in accordance with the EU Directive 97/23/EC (PED).
NOTE 1   Further requirements relating to operating instructions in prEN 12953-13 and to hazard analysis in
CEN/TS 764-6 should be taken into consideration.
This European Standard specifies requirements for both directly fired and electrically heated boilers including Low Pressure Boilers (LPB, see 3.6) as well as for heat recovery boilers with a gas-side pressure not exceeding 0,5 bar of cylindrical design, constructed from carbon or carbon manganese steels by fusion welding and a design pressure not exceeding 40 bar. The boilers covered by this European Standard are intended for land use for providing steam or hot water (typical examples are shown in Figures 1 to 6).
For Low Pressure Boilers (LPB) less stringent requirements concerning design and calculation are acceptable. Details are defined in the respective clauses.
NOTE 2   For boilers operating at a pressure on the gas-side greater than 0,5 bar the rules of this standard equally apply. However, it is generally considered that additional design analysis, inspection and testing may be necessary.
Where a particular boiler is a combination of shell and water-tube design then the water-tube standard series EN 12952 is used in addition to this European Standard. One such example of this combination is shown in Figure 3.
This European Standard applies to the generator, from the feed-water or water inlet connection to the steam or water outlet connection 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.
1.2   Exclusions
This European standard does not apply to the following types of boilers and equipments:
a)   water-tube boilers;
b)   non stationary boilers, e.g. locomotive boilers;
c)   thermal oil boilers;
d)   boilers where the main pressure housing is made of cast material.
e)   pumps, gaskets, etc.
f)   brickwork setting and insulation, etc.
NOTE   Stainless steel boilers are covered by EN 14222.

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This part of this European Standard specifies the minimum requirements for safety related equipment for shell boilers as defined in EN 12953-1, to ensure the boiler operates within the allowable limits (pressure, temperature, etc.) and if the limits are exceeded the energy supply shall be interrupted and locked out without manual (human) intervention at the boiler.
NOTE 1   The maximum time of operation without manual (human) intervention should be defined for each boiler system.
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