BS EN 10253-3:2008

Foreword
Introduction
1 Scope
2 Normative references
3 Terms, definitions and symbols
   3.1 Terms and definitions
   3.2 Symbols
4 Classification of grades and designation
   4.1 Classification of grades
   4.2 Designation
5 Information to be obtained from the purchaser
   5.1 Mandatory information
         5.1.1 Designation of fittings
         5.1.2 Information
   5.2 Options
   5.3 Examples of an order
         5.3.1 Example 1
         5.3.2 Example 2
         5.3.3 Example 3
         5.3.4 Example 4
6 Manufacturing process
   6.1 Steelmaking process
   6.2 Product making process for fittings
         and heat treatment
         6.2.1 Product making process
         6.2.2 Welding
         6.2.3 Heat treatment
7 Technical requirements
   7.1 General
   7.2 Chemical composition - Cast analysis
   7.3 Weldability
   7.4 Mechanical properties at room
         temperature
   7.5 Corrosion resistance
   7.6 Appearance and internal soundness
         7.6.1 Appearance
         7.6.2 Internal soundness
   7.7 Dimensions and tolerances
         7.7.1 General
         7.7.2 Dimensions
         7.7.3 Dimensional tolerances
         7.7.4 Performance of the end bevelling
   7.8 Leak tightness
8 Inspection
   8.1 Inspection documents
         8.1.1 Types of inspection documents
         8.1.2 Content of inspection documents
   8.2 Summary of inspection and testing
9 Sampling
   9.1 Frequency of tests
         9.1.1 Test unit
   9.2 Preparation of samples and test pieces
         9.2.1 Samples and test pieces for mechanical tests
         9.2.2 Test piece for the tensile
                test on the base material
         9.2.3 Test piece for the tensile
                test on the weld
         9.2.4 Test piece for the weld bend test
         9.2.5 Test piece for the intergranular
                corrosion test
10 Test methods
   10.1 Chemical analysis
   10.2 Tensile test on the base material
         10.2.1 At room temperature
         10.2.2 At elevated temperature
   10.3 Transverse tensile test on the weld
   10.4 Weld bend test
   10.5 Intergranular corrosion test
   10.6 Dimensional testing
   10.7 Visual inspection
   10.8 Non destructive testing
         10.8.1 Personnel
         10.8.2 NDT of the weld
   10.9 Material identification
   10.10 Leak tightness test
   10.11 Optional tests
11 Marking
   11.1 Marking to be applied
12 Handling and packaging
Annex A (normative) - Structural dimensions of fittings
Annex B (informative) - Commonly used inside diameters
                        and wall thicknesses, metric sizes
Bibliography

Describes the technical delivery requirements for seamless and welded buttwelding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic-ferritic (duplex) stainless steel without specific inspection requirements.

1.1 This part of EN 10253 specifies the technical delivery requirements for seamless and welded buttwelding fittings (elbows, concentric and eccentric reducers, equal and reducing tees, caps) made of austenitic and austenitic–ferritic (duplex) stainless steel without specific inspection requirements.

It specifies:

• steel grades;

• mechanical properties;

• dimensions and tolerances;

• requirements for inspection and testing;

• inspection documents;

• marking;

• handling and packaging.

1.2 Limitation of use

The allowed pressures and temperatures are the responsibility of the customer according to the state of the art and in application of the safety coefficients in the application regulations, codes and standards.

In common, joint coefficient is used in the calculation of the thicknesses of components which include one or several butt welds, other than circumferential:

• for equipment subject to random non-destructive testing: 0,85;

• for equipment not subject to non-destructive testing other than visual inspection: 0,7.

1.3 Unless otherwise specified in this part of EN 10253 the general technical delivery requirements in EN 100021 apply.