District heating pipes-Preinsulatedbondedpipe systems fordirectlyburied hotwater networks-Joint assembly forsteel service pipes polyurethane thermalinsulationandoutercasingofpolyethylene
Nationalforeword
This British Standardwas published under the authority of the StandardsPolicy and Strategy Committee on 31 May 2009
6008 I88
ISBN 978 0 580 57358 3
This British Standard is the UK implementation of EN 489:2009. Itsupersedes BS EN 489:2003 which is withdrawn.
The UK participation in its preparation was entrusted to Technical Committee RHE/9 Insulated underground pipelines.
A list of organizations represented on this mittee can be obtained onrequest to its secretary.
This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
Compliance with a British Standard cannot confer immunityfrom legal obligations.
Amendments/corrigenda issued since publication
Date Comments
EN 489
ICS 23.040.01
Supersedes EN 489:2003
English Version
directlyburiedhotwaternetworks-Jointassemblyforsteelservicepipes polyurethanethermal insulationandoutercasing ofpolyethylene
Tuyaux de chauffage urbain - Systemes bloques de tuyaux preisoles pour les reseaux dreau chaude enterresdirectement - Assemblage preisole pour tube de service en acier isolation thermique en polyurethane et tube deprotection en polyethylene
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Contents
pageForeword. .4Introduction.. Scope.. ..51 Normative references. .72 3 Terms and definitions .74 Requirements.4.1 4.1.1 General requirements. General requirements for the joint. ... ..84.1.2 4.1.3 Installation of thejoint Competenceof the welder and fitter.4.1.4 Expected thermal life and long term temperature resistance. .... .94.1.5 4.1.6 Steel service pipe weld Polyurethane rigid foam insulation (PUR) ..4.1.7 4.2 Joint casing. Type testrequirements ...9 104.2.1 Water tightness. Soil stress test. ..104.2.2 4.2.3 Polyurethane rigid foam insulation(PUR)properties.. 10 104.2.4 4.3 Weld joint stress crackresistance.. Installation instructions ..10 .114.3.2 4.3.1 General.. Work environment. ..114.3.3 Cleaning. 114.3.5 4.3.4 Surveillance system. Steel site weld. ..11 .114.3.6 4.3.7 Joint insulation.. ...11 ..115 Methods for type tests 125.1 5.2 Waterimpermeabilitytest. Soil stress test. ..12 155.3 5.4 Weld joint stress crack resistance test Polyurethane rigid foam insulation (PUR) ..155.4.1 Genera... .155.4.2 5.4.3 Sampling.. Test specimens. ...15 165.4.4 5.4.5 Ageing resistanc... Cell structure. ..16 165.4.6 5.4.7 Foam density. Water absorption at elevated temperature. ..17 166 Marking .176.1 Joint casing. General. ..176.2 6.3 sbnid 17Annex A (normative) 6.4 Joint insulation system. ..18A.1 General. Fusion welding of steel service pipes on site ..19 19A.2 A.3 Welding process. Material 19 192
A.4 A.5 Preparationforwelding and liningup. Qualification of welders ... 19 19A.6 A.6.1 Steel weld inspection.... .20 20A.6.2 Leak-tightness testwith air/gas. .20A.6.3 A.6.4 Radiographic examination.. Leak-tightness test with water.... .20 .20A.6.5 Ultrasonic examination... .20Annex B (informative)General guidelines for inspection of the joint on site. Annex C (informative) )Qualification of fitters installing joints in preinsulated bonded pipe networks. 21 .23C.1 Knowledge and skill.... .23C.2 C.3 Background for training and testing... Subjects for training and testing 23 23C.3.1 C.3.2 Casing of polyethylene (PE).. General... .23 24C.3.3 PUR-foam system.. Surveillanc.... .25C.3.4 C.3.5 Joint types/jointing systems. .25 26Bibliography. C.3.6 Installation of joints. .27.31
