FprEN 12952-6

Water-tube boilers and auxiliary installations - Part 6: Inspection during construction, documentation and marking of pressure parts of the boiler

This European Standard specifies requirements for the inspection during construction, documentation and marking of water-tube boilers as defined in EN 12952-1.

Wasserrohrkessel und Anlagenkomponenten - Teil 6: Prüfung während der Herstellung, Dokumentation und Kennzeichnung für drucktragende Kesselteile

Chaudières à tubes d'eau et installations auxiliaires - Partie 6: Contrôles pendant la construction, documentation et marquage des parties sous pression de la chaudière

Vodocevni kotli in pomožne napeljave - 6. del: Kontrola med izdelavo, dokumentacija in označevanje tlačno obremenjenih delov kotla

General Information

• Status: Not Published
• ICS: 27.040 - Gas and steam turbines. Steam engines
• Technical Committee: CEN/TC 269 - Shell and water tube boilers
• Drafting Committee: CEN/TC 269/WG 1 - Water-tube boilers
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Due Date: 30-Sep-2021
• Completion Date: 30-Sep-2021
• 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
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: kSIST FprEN 12952-6:2021 - Water-tube boilers and auxiliary installations - Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler

RELATIONS

• Revised: EN 12952-6:2011 - Water-tube boilers and auxiliary installations - Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler
• Effective Date: 13-Mar-2019

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 12952-6:2020
01-marec-2020
Vodocevni kotli in pomožne napeljave - 6. del: Kontrola med izdelavo,
dokumentacija in označevanje tlačno obremenjenih delov kotla

Water-tube boilers and auxiliary installations - Part 6: Inspection during construction;

documentation and marking of pressure parts of the boiler

Wasserrohrkessel und Anlagenkomponenten - Teil 6: Prüfung während der Herstellung,

Dokumentation und Kennzeichnung für drucktragende Kesselteile

Chaudières à tubes d'eau et installations auxiliaires - Partie 6: Contrôles pendant la

construction, documentation et marquage des parties sous pression de la chaudière

Ta slovenski standard je istoveten z: prEN 12952-6
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
oSIST prEN 12952-6:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 12952-6:2020
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oSIST prEN 12952-6:2020
DRAFT
EUROPEAN STANDARD
prEN 12952-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2020
ICS 27.040 Will supersede EN 12952-6:2011
English Version
Water-tube boilers and auxiliary installations - Part 6:
Inspection during construction; documentation and
marking of pressure parts of the boiler

Chaudières à tubes d'eau et installations auxiliaires - Wasserrohrkessel und Anlagenkomponenten - Teil 6:

Partie 6: Contrôles pendant la construction, Prüfung während der Herstellung, Dokumentation und

documentation et marquage des parties sous pression Kennzeichnung für drucktragende Kesselteile

de la chaudière

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 269.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12952-6:2020 E

worldwide for CEN national Members.
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Contents Page

European foreword ...................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 8

4 General organization ..................................................................................................................................... 8

4.1 General................................................................................................................................................................ 8

4.2 Conformity assessment ................................................................................................................................. 9

4.3 Competency of the manufacturer.............................................................................................................. 9

4.4 Calibration of equipment ............................................................................................................................. 9

4.5 Inspection activities ....................................................................................................................................... 9

5 Non-destructive testing (NDT) of parent materials ......................................................................... 11

6 Qualification of welding procedure specification ............................................................................. 11

6.1 General.............................................................................................................................................................. 11

6.2 Application of EN ISO 15614-1:2017, Level 2 ..................................................................................... 12

6.2.1 Tests required ................................................................................................................................................ 12

6.2.2 Mechanical tests ............................................................................................................................................ 12

7 Welder and welding operator qualification ........................................................................................ 14

8 Production test plates for drums ............................................................................................................ 14

8.1 General.............................................................................................................................................................. 14

8.2 Number of production test plates ........................................................................................................... 14

8.3 Tests required ................................................................................................................................................ 15

8.3.1 Non-destructive testing .............................................................................................................................. 15

8.3.2 Destructive tests ............................................................................................................................................ 15

8.4 Acceptance criteria....................................................................................................................................... 15

8.4.1 Non-destructive testing .............................................................................................................................. 15

8.4.2 Transverse tensile test ................................................................................................................................ 16

8.4.3 Longitudinal tensile test on weld metal ............................................................................................... 16

8.4.4 Bend tests ........................................................................................................................................................ 16

8.4.5 Impact values ................................................................................................................................................. 16

8.4.6 Macroscopic examination .......................................................................................................................... 16

8.4.7 Hardness survey ............................................................................................................................................ 16

8.4.8 Dissimilar joints ............................................................................................................................................ 17

8.5 Non-conformance of results ...................................................................................................................... 17

8.5.1 General.............................................................................................................................................................. 17

8.5.2 Specific case for Charpy V-notch impact tests .................................................................................... 17

9 Non-destructive testing of welds ............................................................................................................. 17

9.1 Type and extent of non-destructive testing ........................................................................................ 17

9.1.1 General.............................................................................................................................................................. 17

9.1.2 Drums and Headers...................................................................................................................................... 19

9.1.3 Tube walls ........................................................................................................................................................ 19

9.1.4 Pipes and Tubes ............................................................................................................................................. 20

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9.1.5 Extension procedure of random testing in case of repairs ............................................................ 22

9.2 Qualification of non-destructive testing (NDT) personnel ............................................................ 22

9.3 The detection of surface imperfections ................................................................................................ 23

9.3.1 General ............................................................................................................................................................. 23

9.3.2 Visual examination ...................................................................................................................................... 23

9.3.3 Penetrant testing .......................................................................................................................................... 23

9.3.4 Magnetic particle testing ........................................................................................................................... 23

9.3.5 Acceptance criteria for weld surface imperfections ........................................................................ 24

9.4 Testing for volumetric imperfections ................................................................................................... 26

9.4.1 Radiographic testing ................................................................................................................................... 26

9.4.2 Ultrasonic testing .......................................................................................................................................... 29

9.5 Non-destructive testing reports .............................................................................................................. 30

10 Final inspection ............................................................................................................................................. 31

10.1 Visual and dimensional examinations .................................................................................................. 31

10.2 Hydrostatic pressure test .......................................................................................................................... 31

10.2.1 General ............................................................................................................................................................. 31

10.2.2 Test procedure .............................................................................................................................................. 31

11 Documentation .............................................................................................................................................. 32

12 Marking ............................................................................................................................................................ 33

Annex A (normative) Special requirements for chemical recovery boilers ......................................... 34

A.1 General ............................................................................................................................................................. 34

A.2 Special requirements of qualification of welding procedures for fusion welding ................ 34

A.2.1 General ............................................................................................................................................................. 34

A.2.2 Application of EN ISO 15614-1:2017, Level 2 to composite tubes .............................................. 34

A.2.2.1 Range of qualification ................................................................................................................................. 34

A.2.2.2 Additional tests required ........................................................................................................................... 34

A.2.2.2.1 Depth of penetration of clad weld ................................................................................................... 34

A.2.2.2.2 Hardness test .......................................................................................................................................... 35

A.2.2.2.3 Bend test ................................................................................................................................................... 35

A.2.2.2.4 Transverse tensile test ........................................................................................................................ 35

A.2.2.2.5 Microscopic examination ................................................................................................................... 35

A.3 Special requirements for welder’s qualification for fusion welding of composite

tubes .................................................................................................................................................................. 35

A.3.1 General ............................................................................................................................................................. 35

A.3.2 Application of EN ISO 9606-1:2017 to composite tubes ................................................................. 35

A.3.2.1 Range of qualification ................................................................................................................................. 35

A.3.2.2 Additional tests required - Macroscopic examination .................................................................... 35

A.4 Special requirements for non-destructive testing (NDT) of welds ............................................. 36

A.4.1 General ............................................................................................................................................................. 36

A.4.2 Special requirements for NDT of welds in a chemical recovery boiler - Volumetric

testing ............................................................................................................................................................... 36

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Annex B (informative) Significant technical changes between this document and the

previous edition ............................................................................................................................................ 37

B.1 General.............................................................................................................................................................. 37

B.2 Methods of testing ........................................................................................................................................ 38

Annex ZA (informative) Relationship between this European Standard and the essential

requirements of Directive 2014/68/EU aimed to be covered ...................................................... 39

Bibliography ................................................................................................................................................................. 40

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European foreword

This document (prEN 12952-6:2020) has been prepared by Technical Committee CEN/TC 269 “Shell

and water-tube boilers”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12952-6:2011.

Annex B provides details of significant technical changes between this document and the previous

edition.

EN 12952 series concerning 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;
• 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;

• 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.
NOTE 1 A Part 18 on operating instructions is currently in preparation.
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Although these parts may be obtained separately, it should be recognized that the parts are inter-

dependent. 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 document to be satisfactorily fulfilled.

NOTE 2 Part 4 and Part 15 are not applicable during the design, construction and installation stages.

NOTE 3 A “Boiler Helpdesk” has been established in CEN/TC 269 which may be contacted for any questions

regarding the application of EN 12952 series and EN 12953 series, see the following website: http://www.boiler-

helpdesk.din.de

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 2014/68/EU, see informative Annex ZA, which is an integral part of

this document.
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1 Scope

This document specifies requirements for the inspection during construction, documentation and

marking of water-tube boilers as defined in EN 12952-1:2015.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 12952-1:2015, Water-tube boilers and auxiliary installations - Part 1: General

prEN 12952-2:2020, Water-tube boilers and auxiliary installations — Part 2: Materials for pressure

parts of boilers and accessories

EN 12952-3:2011, Water-tube boilers and auxiliary installations - Part 3: Design and calculation for

pressure parts of the boiler

prEN 12952-5:2020 , Water-tube boilers and auxiliary installations — Part 5: Workmanship and

construction of pressure parts of the boiler

EN ISO 148-1:2016, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO 148-

1:2016)

EN ISO 3452-1:2013, Non-destructive testing - Penetrant testing - Part 1: General principles (ISO 3452-

1:2013, Corrected version 2014-05-01)

EN ISO 5817:2014, Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding

excluded) - Quality levels for imperfections (ISO 5817:2014)

EN ISO 6520-1:2007, Welding and allied processes - Classification of geometric imperfections in metallic

materials - Part 1: Fusion welding (ISO 6520-1:2007)

EN ISO 9606-1:2017, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1:2012

including Cor 1:2012 and Cor 2:2013)

EN ISO 9712:2012, Non-destructive testing - Qualification and certification of NDT personnel (ISO

9712:2012)

EN ISO 11666:2018, Non-destructive testing of welds - Ultrasonic testing - Acceptance levels (ISO

11666:2018)

EN ISO 13588:2019, Non-destructive testing of welds - Ultrasonic testing - Use of automated phased array

technology (ISO 13588:2019)

EN ISO 14732:2013, Welding personnel - Qualification testing of welding operators and weld setters for

mechanized and automatic welding of metallic materials (ISO 14732:2013)

EN ISO 15613:2004, Specification and qualification of welding procedures for metallic materials -

Qualification based on pre-production welding test (ISO 15613:2004)
Under preparation
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EN ISO 15614-1:2017, Specification and qualification of welding procedures for metallic materials -

Welding procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys

(ISO 15614-1:2017, Corrected version 2017-10-01)

EN ISO 17636-1:2013, Non-destructive testing of welds - Radiographic testing - Part 1: X- and gamma-ray

techniques with film (ISO 17636-1:2013)

EN ISO 17636-2:2013, Non-destructive testing of welds - Radiographic testing - Part 2: X- and gamma-ray

techniques with digital detectors (ISO 17636-2:2013)

EN ISO 17637:2016, Non-destructive testing of welds - Visual testing of fusion-welded joints (ISO

17637:2016)

EN ISO 17638:2016, Non-destructive testing of welds - Magnetic particle testing (ISO 17638:2016)

EN ISO 17639:2013, Destructive tests on welds in metallic materials - Macroscopic and microscopic

examination of welds (ISO 17639:2003)

EN ISO 17640:2018, Non-destructive testing of welds - Ultrasonic testing - Techniques, testing levels, and

assessment (ISO 17640:2018)

EN ISO 23277:2015, Non-destructive testing of welds - Penetrant testing - Acceptance levels (ISO

23277:2015)

EN ISO 23278:2015, Non-destructive testing of welds - Magnetic particle testing - Acceptance levels (ISO

23278:2015)
3 Terms and definitions

For the purposes of this document the terms and definitions given in EN 12952-1:2015 and the

following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
inspection

conformity evaluation by observation and judgement accompanied as appropriate by measurement,

testing or gauging
[SOURCE: EN ISO 9000:2015]
4 General organization
4.1 General

The manufacturer shall be responsible for ensuring the boiler conforms to the requirements of this

document. Conformance shall be confirmed by completing a series of inspection activities as detailed in

Table 1.

Except where explicitly stated otherwise in this document, inspection activities applicable to a

manufacturer’s works shall also be applicable to operations carried out on a construction site.

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4.2 Conformity assessment

Guidance in the use of the conformity assessment procedures is given in EN 12952-1:2015, Annex A.

4.3 Competency of the manufacturer

If an assessment of the competency of the manufacturer is required, guidance is given in

prEN 12952-5:2020, Annex F.
4.4 Calibration of equipment

The manufacturer shall establish procedures to ensure that tools, gauges, instruments and other

measuring and testing devices used in the manufacture and inspection activities affecting boiler product

quality, are properly controlled, calibrated and adjusted at specific intervals, to maintain accuracy

within defined limits.

NOTE A system for calibration, e.g. in compliance with the EN ISO 9000 series, is be deemed to meet these

requirements.
4.5 Inspection activities

The manufacturer shall confirm that the boiler components, as a minimum, conform to the

requirements of this document by performing and authenticating the activities listed in Table 1.

NOTE Depending upon the conformity assessment module adopted, some of the inspection activities listed

should also be assessed by a responsible authority. For the guidance of the manufacturer, the specific involvement

of such a responsible authority is indicated in CR 12952-17.
Table 1 — List of inspection activities to be undertaken by the manufacturer
Reference Area of activity Inspection operation
1 Design and general documentation
1.1 Design data/ Ensure that the design data/calculations conform to:
calculations
— technical specifications, if applicable;
— the requirements of this document.
1.2 Manufacturing Ensure that drawing information conforms to:
drawings
— design data and calculations;
— technical specifications, if applicable;
— the requirements of this Document.
1.3 Purchase Ensure that material and component specifications conform to:
specifications
— technical specifications, if applicable;
— manufacturing drawings;
— the requirements of this document.

1.4 Specifications for sub- Ensure that the specification for sub-contracted parts conform

contracted parts to:
— technical specifications, if applicable;
— manufacturing drawings;
— the requirements of this document.
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Reference Area of activity Inspection operation
2 Material

2.1 Material certificates Verify that certificate information and results conform to the

design specification.

2.2 Welding consumables Verify that the consumables to be used are in accordance with

the design specification.

2.3 Material identification Identify the material with the material certificates and check the

markings.

2.4 Transfer of Ensure that the transfer of identification marks is in accordance

identification marks with the approved procedure.

2.5 Acceptance of sub- Verify that sub-contracted parts conform to the manufacturer’s

contracted parts specification.
3 Manufacturing and welding

3.1 Welding procedure Verify that appropriate welding specifications are available and

specifications that their contents are compatible with the welding procedure
qualifications.
3.2 Welding procedure Verify that the welding procedures are appropriate for the

qualifications materials and the field of welding application, and that they have

been approved by a responsible authority.

3.3 Welder qualification/ Verify that the welder/operator qualifications have been

Operator qualification approved by a responsible authority and that they are available

and valid.

3.4 Forming procedures Verify that forming procedures are available, where applicable,

and their contents are appropriate to the product to be formed.
3.5 Joint preparations Examine material cut edges where thermal cutting has been
used and confirm machined preparations are to the correct
profile.
3.6 Formed parts Examine formed parts in accordance with the requirements of
prEN 12952-5:2020, Clause 7.
3.7 Weld assembly Examine the weld assembly, including dimensional check.
3.8 Weld root Examine second side of weld assembly, if applicable, after the
first side of weld has been completed and the root cleaned.
3.9 Production test plates, Identify and mark production test plates.
if any
Verify that any PWHT on production test plates independent of
the component complies with the
...