EN 10253-2:2007

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

This Part of EN 10253 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 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:-type of fittings ;-type A : Butt-welding fittings with reduced pressure factor ;-type B : Butt-welding fittings for use at full service pressure ;-steel grades ;-mechanical properties ;-dimensions and tolerances ;-requirements for inspection and testing ;-inspection documents ;-marking ;-protection and packaging.NOTEIn the case of a harmonised 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.