UNI EN 10253-4 : 2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Classification of grades and designation
6 Information to be supplied by the purchaser
7 Resistance to internal pressure
8 Manufacturing process
9 Technical requirements
10 Appearance and internal soundness
11 Dimensions and tolerances
12 Inspection
13 Sampling
14 Test methods
15 Marking
16 Handling and packaging
Annex A (normative) - Structural dimensions of fittings
Annex B (normative) - Determination of pressure factors
        and wall thickness
Annex C (normative) - Pressure factor tables for fittings
        of type A
Annex D (informative) - Wall thickness tables for
        fittings of type B
Annex ZA (informative) - Relationship between this
         European Standard and the Essential Requirements
         of the EU Directive 97/23/EC
Bibliography

This European Standard specifies the technical delivery requirements for seamless and welded butt-welding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel which are intended for pressure and corrosion resisting purposes at room temperature, at low temperature or at elevated temperatures.