DIN EN 489:2003-05

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 Construction 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 Soil stress test
      4.2.2 polyurethane rigid foam insulation (PUR)
            properties
  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 Foaming
5 Methods for type tests
  5.1 Soil stress test
      5.1.1 General
      5.1.2 Sand box
      5.1.3 Sand
      5.1.4 Test specimens
      5.1.5 Sand box test
      5.1.6 Water impermeability test
  5.2 Polyurethane rigid foam insulation (PUR)
      5.2.1 General
      5.2.2 Test specimens
      5.2.3 Sampling
      5.2.4 Ageing resistance
Annex A (normative) Fusion welding of steel service
      pipes on site
  A.1 Material
  A.2 Welding process
  A.3 Preparation for welding and lining up
  A.4 Qualification of welders
  A.5 Steel weld inspection
      A.5.1 General
      A.5.2 Leak-tightness test with air/gas
      A.5.3 Leak-tightness test with water
      A.5.4 Radiographic examination
      A.5.5 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 Purpose and scope
  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

Specifies requirements for joints, made under field conditions, between adjacent preinsulated pipes and/or fittings in district heating networks.