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BS EN 10253-4:2025 Butt-welding pipe fittings - Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements >
BS EN 10253-4:2025 Butt-welding pipe fittings - Wrought austenitic and austenitic-ferritic (duplex) stainless steels with specific inspection requirements, 2025
- undefined
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Symbols and abbreviations
- 5 Classification and designation [Go to Page]
- 6 Information to be supplied [Go to Page]
- 7 Resistance to internal pressure [Go to Page]
- 8 Manufacturing process [Go to Page]
- Table 1 — Product making process – Product form of starting material [Go to Page]
- 9 Technical requirements [Go to Page]
- Table 2 — Chemical composition (cast analysis) of austenitic stainless steels, in % by mass
- Table 3 — Chemical composition (cast analysis) of austenitic-ferritic stainless steels, in % by mass
- Table 4 — Permissible deviations of the product analysis from specified limits on cast analysis given in Table 2 and Table 3 [Go to Page]
- Table 5 — Mechanical properties for wall thicknesses up to 60 mm at room temperature and impact properties at room temperature and at −196 C of austenitic stainless steels in the solution annealed condition (+AT) b, heat treatment and information abo...
- Table 6 — Mechanical properties for wall thicknesses up to 30 mm at room temperature and impact properties at room temperature and at −40 C of austenitic-ferritic stainless steels in the solution annealed condition (+AT) b, heat treatment and informa... [Go to Page]
- 10 Appearance and internal soundness (delivery conditions) [Go to Page]
- Table 7 — Definition of surface imperfections [Go to Page]
- 11 Dimensions and tolerances [Go to Page]
- Figure 3 — 180 elbow (return bend) [Go to Page]
- Figure 6 — Pulled tee [Go to Page]
- Figure 13 — Cap (cap)
- Figure 14 —Dished end (end) [Go to Page]
- Table 8 — Wall thickness tolerances at the welding ends [Go to Page]
- Table 9 — Tolerances on specific dimensions and form
- Figure 15 — Determination of the tolerance on the form of fittings [Go to Page]
- Figure 16 — Determination of corrugation [Go to Page]
- Figure 17 — Fitting end bevel
- 12 Inspection [Go to Page]
- Table 10 — Inspections and tests
- 13 Sampling [Go to Page]
- Table 11 — Test unit size for wall thickness > 3 mm
- Table 12 — Test unit size for wall thickness ≤ 3 mm cold formed
- Table 13 — Test unit size [Go to Page]
- 14 Test methods [Go to Page]
- Table 14 — NDT of weld seam, test method and acceptance levels [Go to Page]
- 15 Marking
- Table 15 — Marking to be applied
- 16 Protection and packaging
- Annex A (normative) Dimensions
- A.1 General
- A.2 Elbows
- Table A.1 — Elbows – Dimensions – ISO
- Table A.2 — Elbows – Dimensions – METRIC
- A.3 Tees
- A.3.1 Equal and reducing tees
- Table A.3 — Equal and reducing tees – Dimensions
- A.3.2 Pulled tees
- Table A.4 — Pulled tees – Dimensions – ISO
- Table A.5 — Pulled tees – METRIC
- A.3.3 Branch welded tees
- Table A.6 — Branch welded tees – Dimensions – ISO
- Table A.7 — Branch welded tees – Dimensions – METRIC
- Table A.8 — Branch welded tees – Dimensions – METRIC
- A.4 Reducers
- A.4.1 Concentric and eccentric reducers
- Table A.9 — Concentric and eccentric reducers – Dimensions
- A.4.2 Concentric and eccentric reducers (straight)
- Table A.10 — Concentric and eccentric reducers (straight) – Dimensions – ISO
- Table A.11 — Concentric and eccentric reducers (straight) – Dimensions – METRIC
- A.5 Caps
- A.5.1 Caps (model)
- Table A.12 — Caps – Dimensions
- A.5.2 Dished ends (model)
- Table A.13 — Dished ends – Dimensions – ISO
- Table A.14 — Dished ends – Dimensions – METRIC
- Annex B (normative) Determination of pressure factors and wall thickness
- B.1 General
- B.2 Symbols and units
- Table B.1 — Additional symbols for the purposes of Annexes B, C and D
- B.3 Minimal and nominal wall thickness
- B.4 Pressure factors of fittings of type A
- B.4.1 General
- B.4.2 Pressure factor
- B.4.3 Elbows
- B.4.4 Tees
- Figure B.1 — Tee type A
- Figure B.2 — Additional dimensions and areas used in the calculation Ap and Af of a tee
- B.4.5 Reducers
- Figure B.3 — Concentric and eccentric reducer type A
- B.4.6 Caps
- B.5 Wall thicknesses of fittings of type B
- B.5.1 General
- B.5.2 Elbows
- Figure B.4 — Elbow type B
- B.5.3 Tees
- Figure B.5 — Dimensions and areas Ap and Af of a tee
- B.5.4 Reducers
- Figure B.6 — Wall thicknesses and dimensions of reducers type B
- B.5.5 Caps
- Annex C (normative) Pressure factor Tables for fittings of type A
- C.1 General
- C.2 Elbows
- Table C.1 — Pressure factors of elbows type A
- C.3 Tees
- Table C.2 — Pressure factors of tees type A
- C.4 Reducers
- Table C.3 — Pressure factors of concentric reducers type A
- Table C.4 — Pressure factors of eccentric reducers type A
- C.5 Caps
- Table C.5 — Pressure factors of caps type A
- Annex D (informative) Wall thickness tables for fittings of type B
- D.1 General
- D.2 Elbows
- Table D.1 — Wall thickness on the intrados of elbows type B
- D.3 Tees
- Table D.2 — Wall thickness of tees type B
- D.4 Reducers
- Table D.3 — Wall thickness of concentric reducers type B — Wall thickness series 1 to 4
- Table D.4 — Wall thickness of concentric reducers type B — Wall thickness series 5 to 8
- Table D.5 — Wall thickness of eccentric reducers type B — wall thickness series 1 to 4
- Table D.6 — Wall thickness of eccentric reducers type B — Wall thickness series 5 to 8
- D.5 Caps
- Table D.7 — Wall thickness of caps
- Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of Directive 2014/68/EU aimed to be covered
- Table ZA.1 — Correspondence between this European Standard and Annex I of the Directive 2014/68/EU on Pressure Equipment
- Bibliography [Go to Page]