BS EN 12953-4:2018 – TC:2020 Edition
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Tracked Changes. Shell boilers – Workmanship and construction of pressure parts of the boiler
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 109 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | TRACKED CHANGES Text example 1 — indicates added text (in green) |
| 3 | BS EN 12953-4:20022018 BRITISH STANDARD Cross-references Compliance with a British Standard does not of itselfcannot confer immunity from legal obligations. |
| 4 | Summary of pages Amendments/corrigenda issued since publication |
| 8 | Foreword European foreword |
| 10 | 1 Scope 2 Normative references |
| 11 | 3 Terms and definitions 3.1 4 Symbols 5 General requirements 5.1 General |
| 12 | 5.2 Traceability 5.2.1 General 5.2.2 Material 5.2.2.2 Non pressure bearing parts 5.2.2.3 Welding consumables |
| 13 | 5.1.65.2.3 Welding 5.2.4 Inspection (NDT) 5.3 Cylindrical shells a) Straightness b) Irregularities in profile |
| 14 | 2) Peaking at welded seams Table 5.3-1 — Maximum permitted peaking for dynamic and cyclic loads Table 1 — Maximum permitted peaking for dynamic and cyclic loads |
| 15 | Figure 5.3-1 — Profile gauge and its method of use |
| 16 | d) Negative peaking (flat) Figure 1 — Profile gauge and its method of use c) Departure from circularity |
| 17 | d) Cold rolling 5.4 Tell-tale holes 5.5 End plates and tube plates |
| 18 | 5.6 Plain tubes and stay tubes 5.7 Manhole frames and openings 5.7.1 Jointing flanges 5.7.2 DoorsOpenings for access and inspection |
| 19 | a) b) c) d) Figure 2 — Typical types of closing systems for access and inspection openings |
| 20 | Figure 3 — Opening for access and inspection 5.8 Connections for mountingsaccessories 5.8.1 MountingsAccessories 5.8.2 PadsSet-in flange and set-on flange 5.8.3 NozzlesFlanges on nozzles 5.8.4 Screwed mountingsBolting |
| 21 | 5.9 Cylindrical furnaces Table 5.9-1 — Manufacturing tolerances for corrugated furnaces |
| 22 | Figure 5.9-1 — Corrugated furnaces Table 2 — Manufacturing tolerances for corrugated parts of furnaces |
| 23 | Figure 4 — Corrugated furnaces |
| 24 | a) Cold side ≤ 700 C b) Hot side > 700 C Figure 5 — Forms of furnace connections to front tube plate, rear plate and reversal chamber tube plate 5.10 Water-cooled reversal chamber 5.11 Stays 5.11.1 Bar stays |
| 25 | 5.11.2 Girder stays 5.11.3 Tube stays 5.11.4 Non-perpendicular bar stays or tube stays 5.12 Design of welded joints 5.12.1 Weld deposition 5.12.2 Weld crosses 5.12.2.2 Non-pressure parts |
| 26 | 5.12.3 Properties 5.12.45.12.3 Types of welds 5.12.4.25.12.3.2 Internal fillet welds (back welds) |
| 27 | 5.12.4.35.12.3.3 Other welds 5.12.55.12.4 Weld preparations 5.12.65.12.5 Welding plates of unequal thickness 5.13 Openings in or adjacent to welds 5.15 5.14Fabrication 5.15.15.14.1 General |
| 28 | 5.15.25.14.2 Welding Processes 5.15.3 Welding Approvals 5.15.3.1 Approval of fusion welding procedures 5.15.3.2 Approval of welders and welding operators 5.14.2.3 Procedure qualification records (PQR) 5.14.2.4 Welding consumables |
| 29 | 5.14.2.5 Welders and welding operators 5.14.2.6 Temporary attachments 5.14.2.7 Stray arcing 5.15.4 5.14.3 Cutting fitting and alignment |
| 30 | 5.15.55.14.4 Longitudinal joints seams 5.15.65.14.5 Circumferential joints Circumferential seams 5.15.75.14.6 Surface condition before welding 5.15.8 5.14.7 Middleline alignments Table 5.15-1 — Maximum misalignment for finished longitudinal joint in plates |
| 31 | Table 3 — Maximum misalignment for finished longitudinal seam in plates |
| 32 | 5.15.95.14.8 Surface alignment tolerances Table 5.15-2 — Maximum misalignment of plates with circumferential joints |
| 33 | Table 4 — Maximum misalignment of plates with circumferential joints 5.15.9.2 Longitudinal joints 5.14.8.2 Longitudinal joints Table 5.15-3 — Maximum misalignment of plates with longitudinal joints Table 5 — Maximum misalignment of plates with longitudinal joints |
| 34 | 5.15.10 Finished longitudinal and circumferential joints 5.15.11 Fillet welds 5.15.12.25.14.9.2 Restart 5.15.12.35.14.9.3 Single-sided welds 5.15.12.45.14.9.4 End plates welded prior to hot or cold forming |
| 35 | 5.15.12.55.14.9.5 AttachmentsPermanent attachments 5.15.13 5.14.10 Repair of weld defects 5.165.15 Post-weld heat treatment (PWHT) and other heat treatments 5.16.15.15.1 General |
| 36 | 5.16.25.15.2 Material thickness |
| 37 | Key Figure 5.16.1 — Thickness to be considered when determining the requirement for post weld heat treatment |
| 38 | Figure 7 — Thickness to be considered when determining the requirement for post weld heat treatment |
| 39 | 5.16.4 Other heat treatments 5.16.5 Heat treatment of test plates |
| 40 | Annex A |
| 42 | A.5.7 If ultrasonic inspection is required, it can be necessary to examine the welded connection between the branch and shell prior to fitting the compensation ring. A.7.2.1 General A.7.2.2 Weld sizes A.7.2.3 Gap between branch and shell |
| 43 | A.7.2.4 Removal of internal sharp edge in branch bore A.7.2.5 Preparation of hole in shell Figure A.1 — Plate preparation for butt-welded longitudinal and circumferential seams |
| 44 | Figure A.2 — Standard weld preparation details for branches |
| 45 | Figure A.3 — Typical weld preparation details for set-in branches |
| 46 | Figure A.4 — Typical weld preparation details for set-on branches |
| 47 | Figure A.5 — Typical weld preparation details for set-in branches |
| 48 | Figure A.5 — Typical weld preparation details for set-in branches (concluded) |
| 49 | Figure A.6 — Typical weld preparation details for set-in branches with asymmetric welds |
| 50 | Key Key Figure A.7 — Typical weld preparation details for set-in branches welded from one side only |
| 51 | Key Figure A.8 — Typical weld preparation details for set-on branches with added compensation rings |
| 52 | Key Figure A.9 — Typical weld preparation details for set-in branches with added compensation rings |
| 53 | Figure A.10 — Typical weld preparation details for studded pads |
| 54 | Key Key Figure A.11 — Typical weld preparation details for flanges |
| 55 | Figure A.12 — Typical weld preparation details for weld-neck flange |
| 56 | Key Figure A.13 — Typical weld preparation details for attachment of end plates or tube plates to shell |
| 57 | Key Figure A.13 — Typical weld preparation details for attachment of end plates or tube plates to shell (concluded) |
| 58 | Key Figure A.14 — Typical weld preparation details for attachment of end plates or tube plates to reversal chamber wrapper plates |
| 59 | Key Figure A.14 — Typical weld preparation details for attachment of end plates or tube plates to reversal chamber wrapper plates (concluded) |
| 60 | Key Figure A.15 — Typical weld preparation details for attachment of furnaces to tube plates or end plates |
| 61 | Key Figure A.16 — Typical weld preparation details for attachment of access tube to end plate |
| 62 | Annex A Table A.1 —Typical welds for shell boilers |
| 67 | Table ZA.1 — Comparison between EN 12953-4 and Pressure Equipment Directive 97/23/EC with respect to workmanship and construction for shell boilers |
| 69 | Annex C |
| 70 | Table ZA.1 — Correspondence between this European Standard and Directive 2014/68/EU on Pressure Equipment |
| 71 | Bibliography |
| 73 | undefined |
| 79 | 1 Scope 2 Normative references |
| 80 | 3 Terms and definitions 4 Symbols 5 General requirements 5.1 General |
| 81 | 5.2 Traceability 5.2.1 General 5.2.2 Material 5.2.2.1 Pressure bearing parts 5.2.2.2 Non pressure bearing parts 5.2.2.3 Welding consumables 5.2.3 Welding 5.2.4 Inspection (NDT) |
| 82 | 5.3 Cylindrical shells |
| 84 | 5.4 Tell-tale holes 5.5 End plates and tube plates 5.6 Plain tubes and stay tubes |
| 85 | 5.7 Manhole frames and openings 5.7.1 Jointing flanges 5.7.2 Openings for access and inspection |
| 86 | 5.8 Connections for accessories 5.8.1 Accessories 5.8.2 Set-in flange and set-on flange 5.8.3 Flanges on nozzles |
| 87 | 5.8.4 Bolting 5.9 Cylindrical furnaces |
| 89 | 5.10 Water-cooled reversal chamber 5.11 Stays 5.11.1 Bar stays |
| 90 | 5.11.2 Girder stays 5.11.3 Tube stays 5.11.4 Non-perpendicular bar stays or tube stays 5.12 Design of welded joints 5.12.1 Weld deposition 5.12.2 Weld crosses 5.12.2.1 Pressure parts 5.12.2.2 Non-pressure parts |
| 91 | 5.12.3 Types of welds 5.12.3.1 Full penetration welds 5.12.3.2 Internal fillet welds (back welds) 5.12.3.3 Other welds |
| 92 | 5.12.4 Weld preparations 5.12.5 Welding plates of unequal thickness 5.13 Openings in or adjacent to welds 5.14 Fabrication 5.14.1 General 5.14.2 Welding 5.14.2.1 General 5.14.2.2 Welding procedure specification (WPS) 5.14.2.3 Procedure qualification records (PQR) 5.14.2.4 Welding consumables |
| 93 | 5.14.2.5 Welders and welding operators 5.14.2.6 Temporary attachments 5.14.2.7 Stray arcing 5.14.3 Cutting, fitting and alignment |
| 94 | 5.14.4 Longitudinal seams 5.14.5 Circumferential seams 5.14.6 Surface condition before welding 5.14.7 Middle line alignments |
| 95 | 5.14.8 Surface alignment tolerances 5.14.8.1 Circumferential joints 5.14.8.2 Longitudinal joints |
| 96 | 5.14.9 Miscellaneous welding requirements 5.14.9.1 Double-sided welds 5.14.9.2 Restart 5.14.9.3 Single-sided welds 5.14.9.4 End plates welded prior to hot or cold forming |
| 97 | 5.14.9.5 Permanent attachments 5.14.10 Repair of weld defects 5.15 Post-weld heat treatment (PWHT) and other heat treatments 5.15.1 General 5.15.2 Material thickness |
| 100 | Annex A (normative)Typical welds for shell boilers |
| 105 | Annex B (informative)Gaskets for closing systems of access and inspection openings |
| 106 | Annex C (informative)Significant technical changes between this European Standard and the previous edition |
| 107 | Annex ZA (informative)Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU aimed to be covered |
