EN 14419:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Basic functional requirements
  4.1 Dependency of Manufacturer of pipe elements
  4.2 Performance
5 Manufacture of measuring elements
  5.1 General requirements
  5.2 Installation, assembly and operation
  5.3 Characteristics
  5.4 Reliability
  5.5 Maintenance
  5.6 Longitudinal tightness
  5.7 Marking of measuring elements
  5.8 Technical documentation
      5.8.1 General
      5.8.2 For installation of measuring wires within
            pipe elements
      5.8.3 For assembly of measuring elements in the
            field
      5.8.4 For operation of a surveillance system
6 Manufacture of pipe elements with measuring elements
  6.1 General requirements
  6.2 Compatibility test
      6.2.1 Before series production
      6.2.2 Test procedure
      6.2.3 Replication of test
  6.3 Installation of measuring elements
      6.3.1 Restrictions regarding type of measuring
            element
      6.3.2 No electrical contact
      6.3.3 Connections
      6.3.4 Geometry of installation
      6.3.5 Spacers
      6.3.6 Mechanical tightening
  6.4 After pipe element manufacturing
  6.5 Measuring wires at free ends
      6.5.1 Wire length
      6.5.2 Protection of measuring wires
  6.6 Tests
      6.6.1 General
      6.6.2 Continuity of measuring wire
      6.6.3 No electrical contact
7 Assembly of measuring elements in field
  7.1 Check upon receipt of pipe elements
  7.2 Extension of an existing measuring section
      7.2.1 Actual state
      7.2.2 Change of system
  7.3 Wiring design diagram
  7.4 Assembly work in joints
  7.5 Assembly check
  7.6 Test after finishing a measuring section
      7.6.1 General
      7.6.2 Continuity of measuring elements
      7.6.3 No electrical contact and moisture
      7.6.4 Functional test
  7.7 Test and measurement during system operation
  7.8 Quality control programme
  7.9 Technical documentation
Annex A (informative) - Principal function
Annex B (informative) - Principal parts of a measuring
        section
Annex C (normative) - Technical documentation
Annex D (normative) - Loop test by pipe Manufacturer
      D.1 General
      D.2 Conductor continuity test with an optical or
          acoustic signal
      D.3 Measuring ohmic resistance
Annex E (normative) - High voltage test by pipe Manufacturer
Annex F (informative) - Quality control programme
      F.1 General
      F.2 Quality control programme for Manufacturer of pipe
          elements with measuring wires
      F.3 Quality control programme for Contractor assembling
          the measuring elements in field
Annex G (normative) - Loop test in field
Annex H (normative) - Measuring of the electrical insulation
        resistance in field
Bibliography

This European Standard specifies basic functional requirements for surveillance systems for district heating pipe systems, specific requirements for measuring elements and their installation within preinsulated bonded pipes, valves and fittings, and the field assembly of these measuring elements in pipe joints.This standard specifies requirements for the manufacture of measuring elements, for the manufacture of preinsulated bonded pipe elements with measuring elements and for the assembly of the measuring elements in the field.All requirements and recommendations described in this standard are based on the experience gained with existing surveillance systems and their principal function, cf. Annex A.The specific requirements given are only valid for electrical wire based surveillance systems forming an integral part of the pipes, valves, fittings and joints.