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eLibrary >
BS EN 12952-5:2021 - TC Tracked Changes. Water-tube boilers and auxiliary installations - Workmanship and construction of pressure parts of the boiler >
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BS EN 12952-5:2021 - TC Tracked Changes. Water-tube boilers and auxiliary installations - Workmanship and construction of pressure parts of the boiler, 2023
- 30463555
- A-30404069 [Go to Page]
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviations
- 5 General
- 6 Pressure part [Go to Page]
- 6.1 Drums, headers and similar pressure parts [Go to Page]
- 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 [Go to Page]
- 6.3.1 General
- 6.3.2 Responsible personnel
- 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 [Go to Page]
- 6.4.1 Temporary marking
- 6.4.2 Permanent marking
- 6.4.3 Tube bends
- 6.4.4 Location drawings
- 7 Cutting, forming and fabrication tolerances [Go to Page]
- 7.1 Cutting material [Go to Page]
- 7.1.1 Methods for cutting
- 7.1.2 Post-cutting measures
- 7.2 Forming of drums, headers and ends [Go to Page]
- 7.2.1 General
- 7.2.2 Drum and header shells
- 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 [Go to Page]
- 7.3.1 General
- 7.3.2 Tube bending procedure test
- 7.3.3 Requirements for dimensional testing
- 7.3.4 Thinning at the tube bend extrados for tubes of nominal outside diameter 142 mm and below
- 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
- 7.3.8 Post bend heat treatment of tube bends
- 7.3.9 Post-bend heat treatment requirements [Go to Page]
- 7.3.9.1 Ferritic tubing
- 7.3.9.2 Austenitic tubing
- 7.3.10 Ripples on the intrados of tube bends [Go to Page]
- 7.3.10.1 General
- 7.3.10.2 Acceptance standards
- 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 [Go to Page]
- 7.3.14.1 Ferritic materials
- 7.3.14.2 Austenitic materials
- 7.4 Drum and header fabrication tolerances [Go to Page]
- 7.4.1 Assembly tolerances for shells and fabricated from plate and end to shells [Go to Page]
- 7.4.1.1 General
- 7.4.1.2 Middle line alignment tolerances
- 7.4.1.3 Surface alignment tolerances
- 7.4.2 Finished tolerances for shells [Go to Page]
- 7.4.2.1 Tolerances on diameter
- 7.4.2.2 Circularity (out-of-roundness)
- 7.4.2.3 Straightness
- 7.4.3 Finished tolerances for ends [Go to Page]
- 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 [Go to Page]
- 8.1 Design and other requirements specific to welding [Go to Page]
- 8.1.1 General
- 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
- 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
- 8.2 Welding consumables
- 8.3 Welding procedure qualification [Go to Page]
- 8.3.1 General
- 8.3.2 Application of EN ISO 15614-1:2017, Level 2 [Go to Page]
- 8.3.2.1 Tests required
- 8.3.2.2 Mechanical tests
- 8.4 Qualification of welders and welding operators
- 8.5 General production requirements for welding [Go to Page]
- 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
- 8.6 Repairs to welds [Go to Page]
- 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
- 8.9 Welding subsequent to final post-weld heat treatment
- 8.10 Welded joints, connections and production test plates [Go to Page]
- 8.10.1 Longitudinal and circumferential butt welds and test plates in drums and headers
- 8.10.2 Welded header end closures
- 8.10.3 Welded branches, nozzles, stubs and other attachments on drums and headers
- 8.10.4 Pads, reinforcing plates and manhole frames
- 8.11 Attachment of non-pressure parts to drums and headers by welding
- 8.12 Welding of tubes [Go to Page]
- 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
- 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
- 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 [Go to Page]
- 9.1 General
- 9.2 Access openings [Go to Page]
- 9.2.1 Types
- 9.2.2 Size
- 9.2.3 Internal doors
- 9.2.4 External doors
- 9.3 Branches and nozzles mechanically connected to the main pressure parts [Go to Page]
- 9.3.1 Scope and restrictions
- 9.3.2 Screwed connections
- 9.3.3 Studded connections
- 9.4 Tube connections [Go to Page]
- 9.4.1 Expanded connections
- 9.4.2 Tube to tube mechanical connections
- 9.4.3 Connection of non-pressure parts to pressure parts
- 10 Thermal treatment [Go to Page]
- 10.1 General
- 10.2 Heating cycles and heat treatment(s) associated with plate forming operations [Go to Page]
- 10.2.1 Heating cycles associated with hot forming
- 10.2.2 Heat treatment associated with forming
- 10.2.3 Shells and strakes
- 10.2.4 Ends
- 10.2.5 Production test requirements for formed components
- 10.3 Pre-heating for welding and thermal cutting [Go to Page]
- 10.3.1 General
- 10.3.2 Pre-heating for welding
- 10.3.3 Pre-heating for thermal cutting
- 10.3.4 Measurement of pre-heat
- 10.4 Post weld heat treatment [Go to Page]
- 10.4.1 General
- 10.4.2 Methods of post weld heat treatment
- 10.4.3 Post-weld heat treatment procedures
- 10.5 Heat treatment of production test plates
- Annex A (normative)Tube bending procedure tests [Go to Page]
- A.1 General
- A.2 Hot or cold formed bends in tubes with outside diameter ≤ 142 mm [Go to Page]
- A.2.1 Types of bending processes
- A.2.2 Post bending heat treatment (PBHT)
- A.2.3 Validity range of tests
- A.2.4 Qualification test requirements [Go to Page]
- A.2.4.1 General
- A.2.4.2 Ripples on intrados of the bend
- A.2.4.3 Surface defects
- 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 [Go to Page]
- A.3.1 Types of bending processes
- A.3.2 Post bending heat treatment
- A.3.3 The validity range of the test
- A.3.4 Qualification test requirements [Go to Page]
- 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
- A.3.4.6 Mechanical testing
- A.4 Hot formed bends in tubes with outside diameter > 142 mm [Go to Page]
- 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 [Go to Page]
- A.4.4.1 General
- 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
- Annex B (informative)Welded pressure connections and non-pressure containing attachments
- Annex C (normative)Manufacture of welded tubewalls [Go to Page]
- C.1 General
- C.2 Methods of manufacture [Go to Page]
- 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 [Go to Page]
- C.3.1 Tubes
- C.3.2 Fins
- C.3.3 Filler materials
- C.4 Manufacturing processes and controls [Go to Page]
- C.4.1 Welding process
- C.4.2 Specific requirements for manufacturers [Go to Page]
- C.4.2.1 Surface cleanliness
- C.4.2.2 Fin to tube attachment welds
- C.4.2.3 Welding imperfections in fin to tube welds
- C.4.2.4 Site welding
- C.4.3 Heat treatment [Go to Page]
- C.4.3.1 Pre-heating
- C.4.3.2 Post-weld heat treatment
- C.5 Welding procedure approvals
- C.6 Production tests
- C.7 Non-destructive examination (NDE)
- Annex D (normative)Coiled boilers and coiled superheaters [Go to Page]
- D.1 General
- D.2 Special requirements
- Annex E (normative)Special requirements for chemical recovery boilers [Go to Page]
- E.1 General
- E.2 Special requirements for forming of composite tube bends [Go to Page]
- E.2.1 General
- E.2.2 Application of forming rules to composite tubing [Go to Page]
- 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 [Go to Page]
- E.3.1 General
- 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 [Go to Page]
- E.6.1 General
- E.6.2 Application of EN ISO 15614-1:2017, Level 2 to composite tubes [Go to Page]
- E.6.2.1 Range of qualification
- E.6.2.2 Additional tests required
- E.7 Special requirements for welder’s qualification for fusion welding of composite tubes [Go to Page]
- E.7.1 General
- E.7.2 Application of EN ISO 9606-1:2017 to composite tubes [Go to Page]
- E.7.2.1 Range of qualification
- E.7.2.2 Additional tests required - Macroscopic examination
- Annex F (informative)Guidelines for the determination of the competency of boiler manufacturers [Go to Page]
- F.1 General
- F.2 Responsibility of the purchaser
- F.3 Responsibility of the manufacturer
- F.4 Requirements concerning the manufacturer’s competency
- F.5 Manufacturer’s competency declaration
- Annex G (informative)Significant technical changes between this document and the previous edition
- Annex ZA (informative)Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU aimed to be covered [Go to Page]
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