NEN EN 10253-4 : 2008 C1 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

Defines 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.