NS EN 969 : 2009

Committees responsible
National foreword
Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Technical requirements
      4.1 General
             4.1.1 Ductile iron pipes and fittings
             4.1.2 Surface condition and repairs
             4.1.3 Types of joints and interconnection
      4.2 Dimensional requirements
             4.2.1 Wall thickness
             4.2.2 External diameter
             4.2.3 Length
             4.2.4 Straightness of pipes
      4.3 Material characteristics
             4.3.1 Tensile properties
             4.3.2 Hardness
      4.4 Coatings and linings for pipes
             4.4.1 General
             4.4.2 External coating of zinc with finishing
                      layer
      4.5 Coatings for fittings and accessories
             4.5.1 General
             4.5.2 Paint coatings
      4.6 Marking of pipes and fittings
      4.7 Leaktightness
             4.7.1 Pipes and fittings
             4.7.2 Joints
5 Performance requirements for joints
      5.1 General
      5.2 Flexible joints
             5.2.1 General
      5.2 Test conditions
             5.2.3 Test parameters
      5.3 Restrained flexible joints
      5.4 Pipes with screwed-on or welded-on flanges
6 Test methods
      6.1 Dimensions
             6.1.1 Wall thickness
             6.1.2 External diameter
             6.1.3 Length
      6.2 Straightness of pipes
      6.3 Tensile testing
             6.3.1 Samples
             6.3.2 Preparation of test bar
             6.3.3 Apparatus and test method
             6.3.4 Test results
             6.3.5 Test frequencies
      6.4 Brinell hardness
      6.5 Works leaktightness test for pipes and fittings
             6.5.1 General
             6.5.2 Air testing
             6.5.3 Hydrostatic testing
      6.6 Zinc coating mass
      6.7 Thickness of paint coatings
7 Type tests
      7.1 Leaktightness of joints to internal pressure
      7.2 Leaktightness of joints to external water
             pressure
      7.3 Leaktightness and mechanical resistance of
             screwed-on and welded-on flanges
8 Quality assurance
      8.1 General
      8.2 Type tests
      8.3 Quality assurance system
9 Tables of dimensions
      9.1 Socket and spigot pipes
      9.2 Flanged pipes
      9.3 Fittings for socketed joints
      9.4 Fittings for flanged joints
Annex A (normative) Longitudinal bending resistance of pipes
Annex B (normative) Diametral stiffness of pipes
Annex C (informative) Field of use, characteristics of soils
Annex D (informative) Calculation method of buried pipelines,
                      heights of cover
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Table 1
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Table A.1
Table B.1
Table D.1
National Annex NA (informative) Significant changes from BS 4772

Defines requirements and associated test methods applicable to ductile iron fittings, pipes, accessories and their joints for the construction of pipelines: for the conveyance of air or combustible gases, i.e. natural gas or town gas; for installation above or below ground.