EN 12952-5:2021

SLOVENSKI STANDARD
01-februar-2022
Nadomešča:
SIST EN 12952-5:2012
Vodocevni kotli in pomožne napeljave - 5. del: Izdelava in izvedba tlačno
obremenjenih delov kotla
Water-tube boilers and auxiliary installations - Part 5: Workmanship and construction of
pressure parts of the boiler
Wasserrohrkessel und Anlagenkomponenten - Teil 5: Verarbeitung und Bauausführung
für drucktragende Kesselteile
Chaudières à tubes d'eau et installations auxiliaires - Partie 5: Fabrication et construction
des parties sous pression des chaudières
Ta slovenski standard je istoveten z: EN 12952-5:2021
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 12952-5
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2021
EUROPÄISCHE NORM
ICS 27.040 Supersedes EN 12952-5:2011
English Version
Water-tube boilers and auxiliary installations - Part 5:
Workmanship and construction of pressure parts of the
boiler
Chaudières à tubes d'eau et installations auxiliaires - Wasserrohrkessel und Anlagenkomponenten - Teil 5:
Partie 5: Fabrication et construction des parties sous Verarbeitung und Bauausführung für drucktragende
pression des chaudières Kesselteile
This European Standard was approved by CEN on 1 November 2021.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12952-5:2021 E
worldwide for CEN national Members.

Contents
European foreword . 8
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 12
4 Symbols and abbreviations . 12
5 General. 12
6 Pressure part . 13
6.1 Drums, headers and similar pressure parts . 13
6.1.1 Principles for manufacturing . 13
6.1.2 Manufacturing process for header ends . 13
6.1.3 Material for header ends . 13
6.2 Material identification . 13
6.3 Material marking . 13
6.3.1 General. 13
6.3.2 Responsible personnel . 13
6.3.3 Method of marking . 14
6.3.4 Marking of non-pressure parts . 14
6.3.5 Marking of bolts and nuts . 14
6.4 Marking during manufacture . 14
6.4.1 Temporary marking. 14
6.4.2 Permanent marking . 14
6.4.3 Tube bends . 14
6.4.4 Location drawings . 14
7 Cutting, forming and fabrication tolerances . 15
7.1 Cutting material . 15
7.1.1 Methods for cutting . 15
7.1.2 Post-cutting measures. 15
7.2 Forming of drums, headers and ends . 15
7.2.1 General. 15
7.2.2 Drum and header shells . 15
7.2.3 Ends . 16
7.2.4 Plates welded prior to hot or cold forming . 16
7.2.5 Extruded openings in headers . 16
7.3 Forming of tube bends . 16
7.3.1 General. 16
7.3.2 Tube bending procedure test . 16
7.3.3 Requirements for dimensional testing . 16
7.3.4 Thinning at the tube bend extrados for tubes of nominal outside diameter 142 mm
and below . 17
7.3.5 Thickening at the tube bend intrados for tubes of nominal outside diameter above
80 mm and including 142 mm . 18
7.3.6 Thinning/thickening at the tube bend extrados/intrados for tubes of nominal outside
diameter greater than 142 mm . 18
7.3.7 Departure from circularity of the tube bends . 18
7.3.8 Post bend heat treatment of tube bends . 19
7.3.9 Post-bend heat treatment requirements . 20
7.3.10 Ripples on the intrados of tube bends . 21
7.3.11 The surface of tube bends . 23
7.3.12 Gang bending of tube panels. 23
7.3.13 Bending of composite materials tubing . 23
7.3.14 Manufacturing of tube reducers . 23
7.4 Drum and header fabrication tolerances . 24
7.4.1 Assembly tolerances for shells and fabricated from plate and end to shells. 24
7.4.2 Finished tolerances for shells . 25
7.4.3 Finished tolerances for ends . 26
8 Welding . 26
8.1 Design and other requirements specific to welding . 26
8.1.1 General . 26
8.1.2 Material selection with regard to welding . 27
8.1.3 Indication of the welded seams in the drawings . 27
8.1.4 Pre-requisites for welding . 27
8.1.5 Oxy-acetylene welding . 27
8.1.6 Butt welds in tube bends . 27
8.1.7 Minimum distances between adjacent seams . 27
8.1.8 Longitudinal butt welds in drum strakes. 28
8.1.9 Offset of longitudinal butt welds in the case of several strakes . 28
8.1.10 Joints of dissimilar materials . 28
8.1.11 Protection from the weather . 28
8.1.12 Availability of the welding procedure specification . 28
8.2 Welding consumables . 29
8.3 Welding procedure qualification . 29
8.3.1 General . 29
8.3.2 Application of EN ISO 15614-1:2017, Level 2 . 29
8.4 Qualification of welders and welding operators . 31
8.5 General production requirements for welding . 32
8.5.1 Surface condition before welding . 32
8.5.2 Assembly of components for welding . 32
8.5.3 Temporary attachments . 32
8.5.4 Stray arcing . 32
8.5.5 Traceability of welders . 32
8.6 Repairs to welds . 33
8.6.1 General . 33
8.6.2 Repair of longitudinal and circumferential butt welds of drums and headers r
...