NBN EN 10253-1 : 1999

      Foreword
1 Scope
      1.1 Scope
      1.2 Limitation of use
      1.3 Technical delivery conditions
2 Normative references
3 Definitions and symbols
      3.1 Definitions
      3.2 Symbols
4 Information to be supplied by the purchaser
      4.1 Mandatory information
      4.2 Options
      4.3 Examples
5 Manufacturing process
      5.1 Steelmaking process
      5.2 Fitting-making process and heat treatment
6 Metallurgical properties
      6.1 Chemical composition
      6.2 Mechanical characteristics
      6.3 Weldability
7 Dimensions and tolerances
      7.1 Dimensions
      7.2 Tolerances and dimensions
      7.3 End finishing
8 Appearance, imperfections and repair
      8.1 Appearance
      8.2 Imperfections
      8.3 Repair
9 Inspection and testing
      9.1 General
      9.2 Inspection documents
      9.3 Summary of inspection and testing
      9.4 Inspection and test methods
10 Marking
11 Protection and packaging
Annex A (normative) Alternative specification for all types
                    of fittings
      A.1 - Steel grade
      A.2 - Dimensions
Annex B (informative) A-deviation

Gives the criteria for steel butt-welding fittings made from wrought carbon steel - return and elbow bends, dished ends and caps, equal and reducing tees and concentric and eccentric reducers, delivered without specific inspection. Fittings outlined do not satisfy specific design criteria so they cannot be considered as meeting the Essential Requirements of the Pressure Equipment Directive (Directive 97/23/EC of 29.05.1997). It covers steel grade and chemical composition, mechanical features, dimensions and tolerances, technical conditions for test and inspection, and marking, packaging and inspection documents.