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ПІДТВЕРДЖУВАЛЬНЕ ПОВІДОМЛЕННЯ

Державне підприємство
«Український науково-дослідний і навчальний центр
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(ДП «УкрНДНЦ»)

Наказ від 25.12.2015 № 207 (у редакції наказу від 20.05.2016 № 137)

EN 12952-5:2011

Water-tube boilers and auxiliary installations - Part 5: Workmanship and
construction of pressure parts of the boiler
прийнято як національний стандарт
методом «підтвердження» за позначенням

ДСТУ EN 12952-5:2015
(EN 12952-5:2011, IDT)

Котли водотрубні та допоміжне устаткований. Частина 5. Якість виготовлення та конструкція
складників котлів, що перебувають під тиском

З наданням чинності від 2016 -01-01E

EN 12952-5

November 2011

UROPEAN STANDARD

NORME EUROPEENNE

EUROPAISCHE NORM

S

ICS 27.040

upersedes EN 12952-5:2001

English Version

Water-tube boilers and auxiliary installations - Part 5:
Workmanship and construction of pressure parts of the boiler

Chaudieres a tubes d'eau et installations auxiliaires - Partie Wasserrohrkessel und Anlagenkomponenten - Teil 5:

5: Fabrication et construction des parties sous pression de Verarbeitung und BauausfOhrung fur drucktragende

la chaudiere Kesselteile

This European Standard was approved by CEN on 10 September 2011.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION

СОМ1ТЁ EUROPEEN DE NORMALISATION
EUROPA1SCHES KOMITEE FUR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels

©

Ref. No. EN 12952-5:2011: E

2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members

.Contents Page

Foreword 4

1. Scope 6

2. Normative references 6

3. Terms and definitions 7

4. Symbols and abbreviations 8

5. General 8

6. Pressure part 8

   1. Drums, headers and similar pressure parts 8

   2. Material identification 9

   3. Material marking 9

   4. Marking during manufacture 9

7. Cutting, forming and fabrication tolerances 10

   1. Cutting material 10

   2. Forming of drums, headers and ends 11

   3. Forming of tube bends 11

   4. Drum and header fabrication tolerances 19

8. Welding 21

   1. Design and other requirements specific to welding 21

   2. Welding consumables 24

   3. Welding approvals 24

   4. General production requirements for welding 25

   5. Repairs to welds 26

   6. Pre-heating 27

   7. Post-weld heat treatment 27

   8. Welding subsequent to final post-weld heat treatment 27

   9. Welded joints, connections and production test plates 28

   10. Attachment of non-pressure parts to drums and headers by welding 31

   11. Welding of tubes 32

   12. Flash butt welding of tubes 34

   13. Welded tube water walls 34

   14. Arc stud welding 34

9. Mechanical connections 35

   1. General 35

   2. Access openings 35

   3. Branches and nozzles mechanically connected to the main pressure parts 36

   4. Tube connections 37

10. Thermal treatment 39

    1. General 39

    2. Heating cycles and heat treatment(s) associated with plate forming operations 39

    3. Pre-heating for welding and thermal cutting 41

    4. Post weld heat treatment 42

    5. Heat treatment of production test plates 51

1. (normative) Tube bending procedure tests 52

2. (informative) Welded pressure connections and non-pressure containing attachments 61

3. (normative) Manufacture of welded tubewalls 62

4. (normative) Coiled boilers and coiled superheaters 69

Annex E (normative) Special requirements for composite tubes 70

Annex F (informative) Guidelines for the determination of the competency of boiler manufacturers 72

Annex G (informative) Significant technical changes between this European Standard and the previous edition 85

Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC 87

Bibliography 88Foreword

This document (EN 12952-5:2011) has been prepared by Technical Committee CEN/TC269 “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 May 2012, and conflicting national standards shall be withdrawn at the latest by May 2012.

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 12952-5:2001.

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(s).

For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of this document.

Annex G provides details of significant technical changes between this European Standard and the previous edition.

The European Standard series EN 12952 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 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;

• 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.

Although these parts may be obtained separately, it should be recognized that the parts are inter-dependent. As such, the design and manufacture of boilers requires the application of more than one part in order for the requirements of the European Standard 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 European Standards series EN 12952 and EN 12953, see the following website: http://www.boiler-helpdesk.din.de.

1. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.Scope

This European Standard specifies requirements for the workmanship and construction of water-tube boilers as defined in EN 12952-1:2001.

2. Normative references

The following referenced documents are indispensable for the application 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.

EN287-1:2011, Qualification test of welders — Fusion welding — Part 1: Steels

EN 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles

EN 571 -1:1997, Non destructive testing — Penetrant testing — Part 1: General principles

EN 1092-1:2007, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 1: Steel flanges

EN 1418:1997, Welding personnel — Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials

EN 1759-1:2004, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, Class designated— Part 1: Steel flanges, NPS 1/2 to 24

EN 10025-2, Hot rolled products of structural steels — Part 2: Technical delivery conditions for non-alloy structural steels

EN 10028-2, Flat products made of steels for pressure purposes — Part 2: Non-alloy and alloy steels with specified elevated temperature properties

EN 10204:2004, Metallic products— Types of inspection documents

EN 10216-2, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties

EN 10253-2:2007, Butt-welding pipe fittings — Part 2: Non alloy and ferritic alloy steels with specific inspection requirements

EN 10253-4:2008, Butt-welding pipe fittings — Part 4: Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements

EN 12952-1:2001, Water-tube boilers and auxiliary installations — Part 1: General

EN 12952-2:2011, 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

EN 12952-6:2011, Water-tube boilers and auxiliary installations — Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler

EN 12952-7:2002, Water-tube boilers and auxiliary installations — Part 7: Requirements for equipment for the boiler

EN ISO 148-1:2010, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1:2009)

EN ISO 4759-1:2000, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, В and C (ISO 4759-1:2000)

ENISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections (ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006)

ENISO6520-1, Welding and allied processes — Classification of geometric imperfections in metallic materials — Part 1: Fusion welding (ISO 6520-1:2007)

EN ISO 6892-1:2009, Metallic materials — Tensile testing — Part 1: Method of test at room temperature (ISO 6892-1:2009)

EN ISO 14555:2006, Welding — Arc stud welding of metallic materials (ISO 14555:2006)

EN ISO 15609 (all parts), Specification and qualification of welding procedures for metallic materials — Welding procedure specification

EN ISO 15613, Specification and qualification of welding procedure for metallic materials — Qualification based on pre-production welding test (ISO 15613:2004)

EN ISO 15614-1:2004, 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 15614-1:2004)

EN ISO 17638:2009, Non-destructive testing of welds — Magnetic particle testing (ISO 17638:2003)

EN ISO 17663:2009, Welding — Quality requirements for heat treatment in connection with welding and allied processes (ISO 17663:2009)

EN ISO 23277:2009, Non-destructive testing of welds — Penetrant testing of welds — Acceptance levels (ISO 23277:2006)

EN ISO 23278:2009, Non-destructive testing of welds — Magnetic particle testing of welds — Acceptance levels (ISO 23278:2006)

CEN ISO/TR 15608, Welding — Guidelines fora metallic material grouping system (ISO/TR 15608:2005)

3. Terms and definitions

For the purposes of this document the terms and definitions given in EN 12952-1:2001 and the following apply.

cold forming

for ferritic steels, it is forming at temperatures below the maximum permissible temperature for post-weld heat treatment and for austenitic materials it is forming at temperatures below 300 °С

NOTE See Table 10.4-2.

hot forming

for ferritic steels, it is forming at temperatures at or above the maximum permissible temperature for post-weld heat treatment

NOTE See Table 10.4-2.

4. Symbols and abbreviations

For the purposes of this European Standard, the symbols given in EN 12952-1 shall apply. Throughout this European Standard, additional terminology and symbols have been included, where necessary, to meet the requirements of the specific text concerned. It should also be noted that in some clauses the same additional symbol is used in different equations to represent different terms. However, in all such cases, the special meaning of each symbol is indicated for each equation.

5. General

Water-tube boilers shall be manufactured and assembled in accordance with approved drawings, procedures and specifications and good engineering practice.

The workshops and sites associated with the construction of water-tube boilers shall be properly equipped and have suitable provisions for all the inspection and testing specified in EN 12952-6. The relevant manufacturing procedures shall be adequate and manufacturing personnel shall be competent and properly qualified for their assigned tasks. The procedures for the approval of welding and NDE personnel are given respectively in EN 12952-6.2011, Clause 7 and 9.2.

Appropriate records of manufacturing operations shall be maintained.

6. Pressure part

   1. Drums, headers and similar pressure parts

      1. Principles for manufacturing

Drums, headers and similar pressure parts shall be constructed from tubes, forgings, plates or castings. Drums and headers shall be in a suitably clean condition, both internally and externally, to enable proper visual inspection of the surface to be carried out before drilling of holes for tube stubs, branches, etc. and before welding of any permanent connections.

The ends of forged or other seamless steel tube headers shall be carried out by any one of the following methods:

1. forging or spinning;

2. welding in accordance with Clause 8, see also EN 12952-3:2011, Figure 10.3-1;

3. bolted flanges in accordance with relevant European Standards e.g. EN 1092-1:2007 or EN 1759-1:2004.

Bolted flanges in accordance with c) shall not be used where the bolts would be exposed to gases of combustion.

Header ends shall be forged or machined from steel of a grade compatible with the bodies of the headers and profiled as shown in EN 12952-3:2011, Figure 10.3-1.

The manufacturer shall maintain a system of material identification for all pressure parts and drum lifting lugs.

The system shall be such that material used in major pressure parts (drums, tubes for header shells with d₀> 142 mm) can be traced back to its origin. The identification of tubes which are not used for header shells and tubes for header shells with J₀Sl42mm shall be controlled by a system which permits positive identification of cast, on receipt into the manufacturer's works and maintenance of the material type identification throughout manufacturing operations by marking.

The marking of materials shall be maintained throughout the process of manufacture. If original markings are discarded or parts without markings could be created by dividing up parts during the course of manufacture, markings shall be transferred, normally before fabrication.

Appropriate measures shall be taken to ensure that there is no possibility of confusion in the transfer of markings.

Marking transfer shall be performed by the manufacturer's nominated representative(s) except for materials for which an inspection certificate (3.2) to EN 10204:2004 is required and also not for components classified as small parts.

In the case of materials for which an inspection certificate (3.2) to EN 10204:2004 is required, the markings shall be transferred in accordance with the requirements of EN 12952-6:2011.

NOTE This does not apply to small parts which are those made from certified products, such as nipples, nozzles, flanges, compensating rings, with outside diameters equal to or less than 142 mm.

In general, material marking should be done by hard stamping using a low stress type metal stamp or etching.

NOTE Other marking methods may be used if the manufacturer can ensure that their use will not impair the safety of the boiler.

For welded non-pressure parts, marking need only be transferred if the identification of materials is not evident from the drawing or parts list.

Bolts and nuts for pressure purposes shall be marked with the manufacturer's brand mark and property class symbol, or the steel grade code number in accordance with EN ISO 4759-1:2000.

Temporary marks for the purpose of identification during manufacture e.g. parts numbers, welder numbers, radiograph numbers, etc. shall be made by any one, or a combination, of the following methods:

1. painting or pen, provided they are compatible with the material being marked;

2. vibro etching or other etching tool;

3. metal stamps of the low stress type.

Permanent marks complying with the requirements of 6.2 shall be made by any one or a combination, of the following methods:

1. vibro etching or other etching tools;

2. metal stamps of the low stress type;

3. stamped data plates welded directly to the component using an approved welding procedure specification.

Metal stamping shall not be permitted on the curved area of tube bends.

Location drawings may be provided in the case of welders marks, radiographs, etc.

7. Cutting, forming and fabrication tolerances

   1. Cutting material

      1. Methods for cutting

Steel shall be cut by thermal means, shearing, sawing, machining or a combination of these methods. Thermal cutting may necessitate the use of preheating, depending on the type of steel and the thickness in question, which shall be applied in accordance with 10.3.3. It is recognized that the cold worked zone resulting from the shearing process need not be eliminated before welding if this zone will be fused during welding.