EN 489:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
  4.1 General requirements
      4.1.1 General requirements for the joint
      4.1.2 Installation of the joint
      4.1.3 Competence of the welder and fitter
      4.1.4 Expected thermal life and long term temperature
            resistance
      4.1.5 Steel service pipe weld
      4.1.6 Polyurethane rigid foam insulation (PUR)
      4.1.7 Joint casing
  4.2 Type test requirements
      4.2.1 Water tightness
      4.2.2 Soil stress test
      4.2.3 Polyurethane rigid foam insulation (PUR) properties
      4.2.4 Weld joint stress crack resistance
  4.3 Installation instructions
      4.3.1 General
      4.3.2 Work environment
      4.3.3 Cleaning
      4.3.4 Surveillance system
      4.3.5 Steel site weld
      4.3.6 Joint casing
      4.3.7 Joint insulation
5 Methods for type tests
  5.1 Soil stress test
  5.2 Water impermeability test
  5.3 Weld joint stress crack resistance test
  5.4 Polyurethane rigid foam insulation (PUR)
      5.4.1 General
      5.4.2 Test specimens
      5.4.3 Sampling
      5.4.4 Ageing resistance
      5.4.5 Cell structure
      5.4.6 Foam density
      5.4.7 Water absorption at elevated temperature
6 Marking
  6.1 General
  6.2 Joint casing
  6.3 Plugs
  6.4 Joint insulation system
Annex A (normative) Fusion welding of steel service pipes on site
      A.1 General
      A.2 Material
      A.3 Welding process
      A.4 Preparation for welding and lining up
      A.5 Qualification of welders
      A.6 Steel weld inspection
          A.6.1 General
          A.6.2 Leak-tightness test with air/gas
          A.6.3 Leak-tightness test with water
          A.6.4 Radiographic examination
          A.6.5 Ultrasonic examination
Annex B (informative) General guidelines for inspection of the
        joint on site
Annex C (informative) Qualification of fitters installing joints
        in preinsulated bonded pipe networks
      C.1 Knowledge and skills
      C.2 Background for training and testing
      C.3 Subjects for training and testing
          C.3.1 General
          C.3.2 Casing of polyethylene (PE)
          C.3.3 Surveillance
          C.3.4 PUR-foam system
          C.3.5 Joint types/jointing systems
          C.3.6 Installation of joints
Bibliography

This European Standard specifies requirements for joints made under field conditions between adjacent preinsulated pipes and/or fittings in district heating networks. The specified general requirements are also valid for field-made T branches, bends, reducers, caps, etc.This European Standard covers jointing of steel service pipes by means of fusion welding, the connecting of casing ends with joint casings and the thermal insulation with poured rigid PUR foam or prefabricated PUR-foam insulation.This European Standard specifies methods for type tests of complete joints and PUR-foam for joints under laboratory conditions.The requirements of this European Standard can also be applied to casing pipe weldings/connections of on site made fittings.The requirements of this European Standard aim to obtain a technical life of the joints of at least 30 years.