NBN EN 10253-2 : 2008

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Designations
    5.1 Designation of steel grades
    5.2 Designation of fittings
6 Information to be supplied by the purchaser
    6.1 Mandatory information
    6.2 Options
    6.3 Examples of an order
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
9 Technical requirements
    9.1 General
    9.2 Chemical composition
    9.3 Mechanical properties
    9.4 Weldability
10 Appearance and internal soundness
11 Dimensions and tolerances
    11.1 Dimensions
    11.2 Dimensional tolerances
    11.3 End finishing
12 Inspection
    12.1 Type of inspection
    12.2 Inspection documents
    12.3 Summary of inspection and testing
13 Sampling
    13.1 Frequency of tests
    13.2 Preparation of samples and test pieces
14 Test methods
    14.1 Chemical analysis
    14.2 Tensile test on the base material
    14.3 Transverse tensile test on the weld
    14.4 Hardness test
    14.5 Weld bend test
    14.6 Impact testing
    14.7 Dimensional testing
    14.8 Visual inspection
    14.9 Non destructive testing
    14.10 Material identification
15 Marking
    15.1 Marking to be applied
    15.2 Methods
16 Protection and packaging
Annex A (informative) Determination of pressure factors and
                       wall thickness
Annex B (informative) Pressure factor tables for Fittings of
                       type A
Annex C (informative) Wall thickness tables for Fittings of
                       type B
Annex D (informative) Recommended heat treatment temperatures
Annex ZA (informative) Relationship between this European
                       Standard and the Essential Requirements
                       of EU Directive 97/23/EC
Bibliography

Defines 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 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.