UNI EN 489 : 2009
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
DISTRICT HEATING PIPES - PREINSULATED BONDED PIPE SYSTEMS FOR DIRECTLY BURIED HOT WATER NETWORKS - JOINT ASSEMBLY FOR STEEL SERVICE PIPES, POLYURETHANE THERMAL INSULATION AND OUTER CASING OF POLYETHYLENE
22-08-2022
01-01-2009
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
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