EN 15632-4:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Operating conditions
5 Requirements
  5.1 General requirements
  5.2 Service pipes and fittings
  5.3 Axial shear stress
  5.4 Linear water tightness
  5.5 Fittings
  5.6 Surveillance systems
6 Test procedures
  6.1 General
  6.2 Axial shear stress
      6.2.1 General
      6.2.2 Test procedure
  6.3 Cycle test
  6.4 Linear water tightness

This European Standard provides requirements and test methods for flexible, pre-insulated, directly buried district heating pipe assemblies with metallic service pipes and bonding between the layers of the pipes and thermal insulation materials of polyurethane or polyisocyanurate foam. Casing pipe shall be made from polyethylene.This European Standard is valid for maximum operating temperatures up to 140 °C and pressures up to 25 bar for a design lifetime of at least 30 years. NOTEFor higher temperatures or for the transport of other fluids, for example potable water, additional requirements and testing is needed. Such requirements are not specified in this European Standard.