EN 969:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
  4.1 General
      4.1.1 Ductile iron pipes and fittings
      4.1.2 Surface condition and repair
      4.1.3 Types of joints and interconnection
  4.2 Dimensional requirements
      4.2.1 Wall thickness
      4.2.2 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 Leak tightness
5 Performance requirements for joints
  5.1 General
  5.2 Flexible joints
      5.2.1 General
      5.2.2 Test conditions
      5.2.3 Test parameters
  5.3 Restrained flexible joints
  5.4 Flanged joints as cast, screwed, welded and
      adjustable
6 Test methods
  6.1 Pipe dimensions
      6.1.1 Wall thickness
      6.1.2 External diameter
      6.1.3 Internal diameter
      6.1.4 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
  6.4 Brinell hardness
  6.5 Works leak tightness test for pipes and fittings
      6.5.1 General
      6.5.2 Centrifugally cast pipes
      6.5.3 Pipes not centrifugally cast and fittings
  6.6 Zinc mass
  6.7 Thickness of paint coatings
7 Performance test methods
  7.1 Leak tightness of flexible joints to positive
      internal pressure
  7.2 Leak tightness of flexible push-in joints to
      positive external pressure
  7.3 Leak tightness and mechanical resistance of
      flanged joints
8 Tables of dimensions
  8.1 Socket and spigot pipes
  8.2 Flanged pipes
      8.2.1 General
      8.2.2 Centrifugally cast pipes with welded
             flanges
      8.2.3 Centrifugally cast pipes with screwed
             flanges
      8.2.4 Pipes with integrally cast flanges
  8.3 Fittings for socketed joints
      8.3.1 General
      8.3.2 Flanged sockets
      8.3.3 Flanged spigots
      8.3.4 Collars
      8.3.5 Double socket 90 Degrees (1/4) bends
      8.3.6 Double socket 45 Degrees (1/8) bends
      8.3.7 Double socket 22 Degrees 30 Minutes (1/16) bends
      8.3.8 Double socket 11 Degrees 15 Minutes (1/32) bends
      8.3.9 All socket tees
      8.3.10 Double socket tees with flanged
             branch, DN 40 to DN 250
      8.3.11 Double socket tees with flanged
             branch, DN 300 to DN 600
      8.3.12 Double socket tapers
  8.4 Fittings for flanged joints
      8.4.1 Double flanged 90 Degrees (1/4) bends
      8.4.2 Double flanged duckfoot 90 Degrees (1/4)
             bends
      8.4.3 Double flanged 45 Degrees (1/8) bends
      8.4.4 Double flanged 22 Degrees 30 Minutes (1/16) bends
      8.4.5 Double flanged 11 Degrees 15 Minutes (1/32) bends
      8.4.6 All-flanged tees, DN 40 to DN 250
      8.4.7 All-flanged tees, DN 300 to DN 600
      8.4.8 Double flanged tapers
      8.4.9 Blank flanges PN 10
      8.4.10 Blank flanges PN 16
      8.4.11 Reducing flanges PN 10
      8.4.12 Reducing flanges PN 16
9 Evaluation of conformity
  9.1 General
  9.2 Initial performance testing
      9.2.1 General
      9.2.2 Characteristics
      9.2.3 Treatment of calculated values and design
      9.2.4 Sampling, testing and conformity criteria
  9.3 Factory production control (FPC)
      9.3.1 General
      9.3.2 FPC requirements for all manufacturers
      9.3.3 Manufacturer-specific FPC system requirements
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
      D.1 Calculation method
          D.1.1 Calculation formula
          D.1.2 Pressure from earth loading
          D.1.3 Pressure from traffic loading
          D.1.4 Bedding factor, K
          D.1.5 Factor of lateral pressure, f
          D.1.6 Modulus of soil reaction, E'
      D.2 Heights of cover
Annex ZA (informative) - Clauses of this European Standard
         addressing essential requirements or other
         provisions of EU Directives
      ZA.1 Scope and relevant characteristics
      ZA.2 Procedure for attestation of conformity of
           ductile iron pipes, fittings, accessories
           and their joints for gas applications
           ZA.2.1 System of attestation of conformity
           ZA.2.2 Declaration of conformity
      ZA.3 CE marking and labelling
Bibliography

This European Standard specifies the requirements and associated test methods applicable to ductile iron pipes, fittings, accessories and their joints used for the construction of external pipelines:-to convey air or combustible gases (e.g. natural gas or town gas) at pressures up to 16 bar;-to be installed below or above ground.NOTE 1A combustible gas is a gas or any fuel that is in gaseous state at a temperature of 15 °C at a pressure of 1 bar.This European Standard applies to pipes, fittings and accessories which are:-manufactured with socketed, flanged or spigot ends;-normally delivered externally and internally coated;-suitable for gas temperatures between - 15 °C and 50 °C.This European Standard covers pipes, fittings and accessories cast by any type of foundry process or manufactured by fabrication of cast components, as well as corresponding joints, in a size range extending from DN 40 to DN 600 inclusive.This European Standard specifies requirements for materials, dimensions and tolerances, mechanical properties and standard coatings of ductile iron pipes and fittings. It also gives performance requirements for all components including joints. Joint design and gasket shape are outside the scope of this European Standard.NOTE 2In this European Standard, all pressures are relative pressures expressed in bars (100 kPa = 1 bar).