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BS EN 12952-5:2021 – TC:2023 Edition

BS EN 12952-5:2021 – TC:2023 Edition

$280.87

Tracked Changes. Water-tube boilers and auxiliary installations – Workmanship and construction of pressure parts of the boiler

Published By Publication Date Number of Pages
BSI 2023 234
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This European Standard specifies requirements for the workmanship and construction of water-tube boilers as defined in EN 12952-1.

PDF Catalog

PDF Pages PDF Title
1 30463555
133 A-30404069
134 undefined
146 1 Scope
2 Normative references
148 3 Terms and definitions
4 Symbols and abbreviations
5 General
149 6 Pressure part
6.1 Drums, headers and similar pressure parts
6.1.1 Principles for manufacturing
6.1.2 Manufacturing process for header ends
6.1.3 Material for header ends
6.2 Material identification
6.3 Material marking
6.3.1 General
6.3.2 Responsible personnel
150 6.3.3 Method of marking
6.3.4 Marking of non-pressure parts
6.3.5 Marking of bolts and nuts
6.4 Marking during manufacture
6.4.1 Temporary marking
6.4.2 Permanent marking
6.4.3 Tube bends
6.4.4 Location drawings
151 7 Cutting, forming and fabrication tolerances
7.1 Cutting material
7.1.1 Methods for cutting
7.1.2 Post-cutting measures
7.2 Forming of drums, headers and ends
7.2.1 General
7.2.2 Drum and header shells
152 7.2.3 Ends
7.2.4 Plates welded prior to hot or cold forming
7.2.5 Extruded openings in headers
7.3 Forming of tube bends
7.3.1 General
7.3.2 Tube bending procedure test
7.3.3 Requirements for dimensional testing
153 7.3.4 Thinning at the tube bend extrados for tubes of nominal outside diameter 142 mm and below
154 7.3.5 Thickening at the tube bend intrados for tubes of nominal outside diameter above 80 mm and including 142 mm
7.3.6 Thinning/thickening at the tube bend extrados/intrados for tubes of nominal outside diameter greater than 142 mm
7.3.7 Departure from circularity of the tube bends
155 7.3.8 Post bend heat treatment of tube bends
156 7.3.9 Post-bend heat treatment requirements
7.3.9.1 Ferritic tubing
157 7.3.9.2 Austenitic tubing
7.3.10 Ripples on the intrados of tube bends
7.3.10.1 General
7.3.10.2 Acceptance standards
159 7.3.11 The surface of tube bends
7.3.12 Gang bending of tube panels
7.3.13 Bending of composite materials tubing
7.3.14 Manufacturing of tube reducers
7.3.14.1 Ferritic materials
160 7.3.14.2 Austenitic materials
7.4 Drum and header fabrication tolerances
7.4.1 Assembly tolerances for shells and fabricated from plate and end to shells
7.4.1.1 General
7.4.1.2 Middle line alignment tolerances
161 7.4.1.3 Surface alignment tolerances
7.4.2 Finished tolerances for shells
7.4.2.1 Tolerances on diameter
7.4.2.2 Circularity (out-of-roundness)
162 7.4.2.3 Straightness
7.4.3 Finished tolerances for ends
7.4.3.1 Tolerances on diameters
7.4.3.2 Circularity (out-of-roundness)
7.4.3.3 Thickness
7.4.3.4 Profile
8 Welding
8.1 Design and other requirements specific to welding
8.1.1 General
163 8.1.2 Material selection with regard to welding
8.1.3 Indication of the welded seams in the drawings
8.1.4 Pre-requisites for welding
8.1.5 Oxy-acetylene welding
8.1.6 Butt welds in tube bends
8.1.7 Minimum distances between adjacent seams
164 8.1.8 Longitudinal butt welds in drum strakes
8.1.9 Offset of longitudinal butt welds in the case of several strakes
8.1.10 Joints of dissimilar materials
8.1.11 Protection from the weather
8.1.12 Availability of the welding procedure specification
165 8.2 Welding consumables
8.3 Welding procedure qualification
8.3.1 General
8.3.2 Application of EN ISO 15614-1:2017, Level 2
8.3.2.1 Tests required
166 8.3.2.2 Mechanical tests
167 8.4 Qualification of welders and welding operators
168 8.5 General production requirements for welding
8.5.1 Surface condition before welding
8.5.2 Assembly of components for welding
8.5.3 Temporary attachments
8.5.4 Stray arcing
8.5.5 Traceability of welders
169 8.6 Repairs to welds
8.6.1 General
8.6.2 Repair of longitudinal and circumferential butt welds of drums and headers requiring test plates
8.6.3 Non-destructive examination
8.6.4 Records of weld repairs
8.7 Pre-heating
8.8 Post-weld heat treatment
170 8.9 Welding subsequent to final post-weld heat treatment
171 8.10 Welded joints, connections and production test plates
8.10.1 Longitudinal and circumferential butt welds and test plates in drums and headers
173 8.10.2 Welded header end closures
8.10.3 Welded branches, nozzles, stubs and other attachments on drums and headers
174 8.10.4 Pads, reinforcing plates and manhole frames
8.11 Attachment of non-pressure parts to drums and headers by welding
175 8.12 Welding of tubes
8.12.1 General
8.12.2 Continuity of welding
8.12.3 Completion of welding
8.12.4 Proximity of butt welds in straight tubes
8.12.5 Alignment of tube bores
176 8.12.6 Angular alignment of butt welded tubes
8.12.7 Fabricated bends
8.12.8 Backing rings
8.12.9 Purging of welds
8.12.10 Welding of branches, nozzles and stubs to tubes
177 8.12.11 Attachment by welding of non-pressure parts to tubes
8.13 Flash butt welding of tubes
8.14 Welded tube water walls
8.15 Arc stud welding
9 Mechanical connections
9.1 General
9.2 Access openings
9.2.1 Types
178 9.2.2 Size
9.2.3 Internal doors
9.2.4 External doors
179 9.3 Branches and nozzles mechanically connected to the main pressure parts
9.3.1 Scope and restrictions
9.3.2 Screwed connections
9.3.3 Studded connections
9.4 Tube connections
9.4.1 Expanded connections
182 9.4.2 Tube to tube mechanical connections
9.4.3 Connection of non-pressure parts to pressure parts
10 Thermal treatment
10.1 General
10.2 Heating cycles and heat treatment(s) associated with plate forming operations
10.2.1 Heating cycles associated with hot forming
183 10.2.2 Heat treatment associated with forming
10.2.3 Shells and strakes
10.2.4 Ends
184 10.2.5 Production test requirements for formed components
10.3 Pre-heating for welding and thermal cutting
10.3.1 General
10.3.2 Pre-heating for welding
185 10.3.3 Pre-heating for thermal cutting
10.3.4 Measurement of pre-heat
186 10.4 Post weld heat treatment
10.4.1 General
191 10.4.2 Methods of post weld heat treatment
194 10.4.3 Post-weld heat treatment procedures
195 10.5 Heat treatment of production test plates
196 Annex A (normative)Tube bending procedure tests
A.1 General
A.2 Hot or cold formed bends in tubes with outside diameter ≤ 142 mm
A.2.1 Types of bending processes
197 A.2.2 Post bending heat treatment (PBHT)
A.2.3 Validity range of tests
198 A.2.4 Qualification test requirements
A.2.4.1 General
A.2.4.2 Ripples on intrados of the bend
A.2.4.3 Surface defects
199 A.2.4.4 Bend geometry
A.2.4.5 Hardness test
A.2.4.6 Mechanical tests
A.2.4.7 Gang bending of tube panels
A.3 Cold formed bends in tubes with outside diameter > 142 mm
A.3.1 Types of bending processes
A.3.2 Post bending heat treatment
200 A.3.3 The validity range of the test
A.3.4 Qualification test requirements
A.3.4.1 General
A.3.4.2 Ripples on intrados of the bend
A.3.4.3 Surface imperfections
A.3.4.4 Bend geometry
A.3.4.5 Hardness test
201 A.3.4.6 Mechanical testing
A.4 Hot formed bends in tubes with outside diameter > 142 mm
A.4.1 Types of bending processes
A.4.2 Post bending heat treatment
A.4.3 The validity range of the test
A.4.4 Qualification test requirements
A.4.4.1 General
202 A.4.4.2 Ripples on intrados of the bend
A.4.4.3 Surface imperfections
A.4.4.4 Bend geometry
A.4.4.5 Mechanical testing
205 Annex B (informative)Welded pressure connections and non-pressure containing attachments
206 Annex C (normative)Manufacture of welded tubewalls
C.1 General
C.2 Methods of manufacture
C.2.1 General
C.2.2 Tubes finned by welding
C.2.3 Integrally finned tubes
C.2.4 Other methods
C.3 Allowable materials
C.3.1 Tubes
C.3.2 Fins
207 C.3.3 Filler materials
C.4 Manufacturing processes and controls
C.4.1 Welding process
C.4.2 Specific requirements for manufacturers
C.4.2.1 Surface cleanliness
C.4.2.2 Fin to tube attachment welds
208 C.4.2.3 Welding imperfections in fin to tube welds
C.4.2.4 Site welding
C.4.3 Heat treatment
C.4.3.1 Pre-heating
C.4.3.2 Post-weld heat treatment
C.5 Welding procedure approvals
C.6 Production tests
209 C.7 Non-destructive examination (NDE)
213 Annex D (normative)Coiled boilers and coiled superheaters
D.1 General
D.2 Special requirements
214 Annex E (normative)Special requirements for chemical recovery boilers
E.1 General
E.2 Special requirements for forming of composite tube bends
E.2.1 General
E.2.2 Application of forming rules to composite tubing
E.2.2.1 Range of tube bending procedure test approval
E.2.2.2 Additional tests required for composite tubes
E.3 Special requirements for manufacture of welded tubewalls from composite tubes
E.3.1 General
215 E.3.2 Fins
E.3.3 Fin-to-tube attachment welds on composite tubes
E.4 Material marking
E.5 Flash butt welding
E.6 Special requirements of qualification of welding procedures for fusion welding
E.6.1 General
E.6.2 Application of EN ISO 15614-1:2017, Level 2 to composite tubes
E.6.2.1 Range of qualification
E.6.2.2 Additional tests required
216 E.7 Special requirements for welder’s qualification for fusion welding of composite tubes
E.7.1 General
E.7.2 Application of EN ISO 9606-1:2017 to composite tubes
E.7.2.1 Range of qualification
217 E.7.2.2 Additional tests required – Macroscopic examination
218 Annex F (informative)Guidelines for the determination of the competency of boiler manufacturers
F.1 General
F.2 Responsibility of the purchaser
F.3 Responsibility of the manufacturer
F.4 Requirements concerning the manufacturer’s competency
219 F.5 Manufacturer’s competency declaration
230 Annex G (informative)Significant technical changes between this document and the previous edition
231 Annex ZA (informative)Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU aimed to be covered

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BS EN 12952-5:2021 - TC
$280.87