UNI 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
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
Bibliography

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