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BS EN 10253-2:2021

BS EN 10253-2:2021

$215.11

Butt-welding pipe fittings – Non alloy and ferritic alloy steels with specific inspection requirements

Published By Publication Date Number of Pages
BSI 2021 150
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This document specifies the technical delivery requirements for seamless and welded butt?welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of carbon and alloy steel in two test?categories which are intended for pressure purposes at room temperature, at low temperature or at elevated temperatures, and for the transmission and distribution of fluids and gases.

It specifies:

  1. type of fittings;

    1. type A: Butt-welding fittings with reduced pressure factor;

    2. type B: Butt-welding fittings for use at full service pressure;

  2. steel grades and their chemical compositions;

  3. mechanical properties;

  4. dimensions and tolerances;

  5. requirements for inspection and testing;

  6. inspection documents;

  7. marking;

  8. protection and packaging.

NOTE

The selection of the appropriate fitting (material, thickness) is the ultimate responsibility of the manufacturer of the pressure equipment (see European Legislation for Pressure Equipment). In the case of a harmonized supporting standard for materials, presumption of conformity to the ESRs is limited to technical data of materials in the standard and does not presume adequacy of the material to a specific item of equipment. Consequently, it is essential that the technical data stated in the material standard be assessed against the design requirements of this specific item of equipment to verify that the ESRs of the PED are satisfied.

PDF Catalog

PDF Pages PDF Title
2 undefined
13 1 Scope
2 Normative references
17 3 Terms and definitions
18 4 Symbols and abbreviations
19 5 Classification and designation
5.1 Classification of grades
5.2 Designation of steel grades
5.3 Designation of fittings
5.3.1 General
5.3.2 Elbows and return bends
5.3.3 Reducers
20 5.3.4 Tees
5.3.5 Caps
6 Information to be supplied by the purchaser
6.1 Mandatory information
6.2 Options
22 6.3 Examples of an order
6.3.1 Example 1
6.3.2 Example 2
6.3.3 Example 3
6.3.4 Example 4
6.3.5 Example 5
23 7 Resistance to internal pressure
7.1 General
7.2 Fittings of type A
7.3 Fittings of type B
8 Manufacturing process
8.1 Steelmaking process
8.2 Product making process for fittings and heat treatment
8.2.1 Product making process
24 8.2.2 Welding
8.2.2.1 General
25 8.2.2.2 Welding as part of the manufacturing process of the fitting
8.2.2.3 Finished weld requirement
8.2.2.4 Heat treatment after welding
8.2.3 Heat treatment condition
27 9 Technical requirements
9.1 General
9.2 Chemical composition
9.2.1 Cast analysis
9.2.2 Product analysis
31 9.3 Mechanical properties
38 9.4 Creep rupture strength values
9.5 Weldability
10 Appearance and internal soundness (delivery conditions)
10.1 Definitions of surface imperfections
40 10.2 Appearance
10.3 Internal soundness
11 Dimensions and tolerances
11.1 Dimensions
11.1.1 General
41 11.1.2 Elbows
11.1.3 Tees
42 11.1.4 Reducers
43 11.1.5 Caps
11.1.6 Preferred diameters and wall thicknesses
45 11.2 Dimensional tolerances
11.2.1 Diameter
11.2.2 Out of roundness
46 11.2.3 Wall thickness tolerances
11.2.4 Tolerances on specific dimensions and form
47 11.2.5 Corrugation
48 11.3 Performance of the end bevelling
49 12 Inspection
12.1 Type of inspection
12.2 Inspection documents
12.2.1 Type of inspection documents
12.2.2 Content of inspection documents
50 12.3 Summary of inspection and testing
52 13 Sampling
13.1 Frequency of tests
13.1.1 Test unit
53 13.1.2 Number of test pieces per test unit
13.2 Preparation of samples and test pieces
13.2.1 Samples for product analysis
54 13.2.2 Samples and test pieces for mechanical tests
13.2.3 Test piece for the tensile test on the base material
13.2.4 Test piece for the tensile test transverse to the weld
13.2.5 Test piece for the weld bend test
13.2.6 Test piece for the impact test
55 14 Test methods
14.1 Chemical analysis
14.2 Tensile test on the base material
14.2.1 At room temperature
14.2.2 At elevated temperature
14.3 Transverse tensile test on the weld
14.4 Hardness test
56 14.5 Weld bend test
14.6 Impact testing
57 14.7 Dimensional testing
14.8 Visual testing (VT)
14.9 Non-destructive testing (NDT)
14.9.1 Personnel
14.9.2 NDT of the weld
14.9.3 NDT of cold formed tees
58 14.9.4 NDT for the detection of laminar imperfections
14.9.5 NDT for the detection of longitudinal imperfections
14.9.6 NDT for the detection of transverse imperfections
14.9.7 NDT of bars and forgings
14.10 Positive material identification (PMI)
59 15 Marking
60 16 Protection and packaging
61 Annex A (normative)Dimensions
A.1 General
A.2 Elbows
63 A.3 Tees
65 A.4 Reducers
67 A.5 Caps
69 Annex B (normative)Determination of pressure factors and wall thickness
B.1 General
B.2 Symbols and units
72 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
73 B.4.3 Elbows
B.4.4 Tees
76 B.4.5 Reducers
81 B.4.6 Caps
83 B.5 Wall thicknesses of fittings of type B
B.5.1 General
B.5.2 Elbows
84 B.5.3 Tees
87 B.5.4 Reducers
91 B.5.5 Caps
93 Annex C (normative)Pressure factor tables for Fittings of type A
C.1 General
C.2 Elbows
96 C.3 Tees
103 C.4 Reducers
112 C.5 Caps
113 Annex D (informative)Wall thickness tables for fittings of type B
D.1 General
D.2 Elbows
116 D.3 Tees
125 D.4 Reducers
140 D.5 Caps
141 Annex E (informative)Recommended heat treatment temperatures
142 Annex F (informative)Creep rupture strength values
147 Annex ZA (informative)Relationship between this European Standard and the Essential Requirements of EU Directive 2014/68/EU

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BS EN 10253-2:2021
$215.11