NS 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 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
Annexes
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
B (informative) General guidelines for inspection of
     the joint on site
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. Specifies methods for type tests of complete joints and PUR-foam for joints under laboratory conditions.