NEN EN 14525 : 2004

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
  4.1 General
      4.1.1 Diameter range
      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 Joint gap and depth of engagement
  4.3 Mechanical properties of ductile iron
      4.3.1 Tensile properties
      4.3.2 Hardness
  4.4 Coatings
      4.4.1 General
      4.4.2 Coating of ductile iron components
      4.4.3 Coating of bolts and nuts
  4.5 Product information
      4.5.1 Marking requirements
      4.5.2 Additional information
  4.6 Leak tightness
      4.6.1 Couplings and flange adaptors
      4.6.2 Joints
5 Performance requirements for joints
  5.1 General
  5.2 Pressure rating
  5.3 Flexible joints
      5.3.1 General
      5.3.2 Angular deflection
      5.3.3 Test conditions
      5.3.4 Test parameters
  5.4 Restrained flexible joints
  5.5 Flanged joints
6 Test methods
  6.1 Tensile testing
      6.1.1 Samples
      6.1.2 Preparation of test bar
      6.1.3 Apparatus and test method
      6.1.4 Test results
  6.2 Brinell hardness
  6.3 Works leak tightness test
      6.3.1 General
      6.3.2 Air test
      6.3.3 Hydrostatic pressure test
7 Performance tests
  7.1 Leak tightness of joints to positive internal pressure
      7.1.1 Coupling
      7.1.2 Flange adaptor
  7.2 Leak tightness of joints to negative internal pressure
  7.3 Leak tightness of joints to dynamic internal pressure
Annex A (informative) Outside diameters of existing pipes
Annex B (informative) Quality assurance
Bibliography

Specifies the requirements and associated test methods applicable to wide tolerance ductile iron couplings and wide tolerance flange adaptors intended for use with pipe components made from a number of pipe materials (ductile iron, grey iron, PE, PVC-U, steel, fibre-cement), for providing a leak tight seal over a wide range of pipe external diameters.