BS EN 448:2015
$167.15
District heating pipes. Preinsulated bonded pipe systems for directly buried hot water networks. Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 34 |
This European Standard specifies requirements and test methods for fittings of prefabricated thermally insulated pipe-in-pipe assemblies comprising a steel service fitting from DN 20 to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene for use in directly buried hot water networks with preinsulated pipe assemblies in accordance with EN 253 .
This European Standard covers the following fittings: bend, tee, reducer, single use compensator and anchor.
This European Standard applies only to factory made prefabricated fitting assemblies and single use compensators for continuous operation with hot water at various temperatures in accordance with EN 253 .
This European Standard applies to fitting assemblies with a minimum design pressure of 16 bar (overpressure) complying with EN 13941 .
This European Standard does not include calculation rules for loads and stresses. The design and installation rules, for the system, are given in EN 13941 .
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Contents Page |
| 8 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions |
| 12 | 4 Requirements 4.1 Steel parts 4.1.1 General 4.1.2 Quality 4.1.3 Wall thickness and diameter 4.1.4 Bends 4.1.4.1 Butt welding bends 4.1.4.2 Cold formed bends |
| 13 | 4.1.4.3 Hot-formed bends 4.1.4.4 Tolerances of bending angles 4.1.5 T-pieces 4.1.5.1 Forged T-pieces 4.1.5.2 Welding saddles 4.1.5.3 Welded T-pieces |
| 14 | 4.1.5.4 Tolerances of angles between branch pipes and main pipes 4.1.6 Reducers 4.1.7 Anchors 4.1.8 Single use compensators 4.1.9 Caps 4.1.10 Fusion welding of steel fittings 4.1.10.1 Filler material 4.1.10.2 Welding process 4.1.10.3 Preparation for welding |
| 16 | 4.1.10.4 Inspection of welds 4.1.10.5 Competence of the welder 4.1.11 Surface condition |
| 17 | 4.2 Casing 4.3 Polyurethane rigid foam insulation (PUR) 4.4 Fitting assemblies 4.4.1 Fitting ends 4.4.1.1 Service pipe 4.4.1.2 Centre line deviation 4.4.1.3 Angular deviation between service pipe and casing 4.4.2 Angle between casing segments of bend and minimum length |
| 18 | 4.4.3 Requirements of polyethylene welding 4.4.3.1 General 4.4.3.2 Melt flow rate 4.4.3.3 Visual appearance |
| 19 | 4.4.3.4 Bending test 4.4.4 Leak-tightness of the welded casing pipe |
| 20 | 4.4.5 Diameter and wall thickness of the casing 4.4.6 Minimum insulation thickness in bends 4.4.7 Tolerances of the main fitting dimensions 4.5 Surveillance system 5 Test methods 5.1 General |
| 21 | 5.2 Test specimens 5.3 Steel parts 5.3.1 Visual surface examination of welds 5.3.2 Leak-tightness test with water 5.3.3 Leak-tightness test with air 5.3.4 Non-destructive examination of welds |
| 22 | 5.3.5 NDT of welds 5.4 Casing 5.5 Polyurethane rigid foam insulation (PUR) 5.6 Fitting assemblies 5.6.1 Centre line deviation and angular deviation 5.6.2 Visual examination of welds on casing pipes 5.6.3 Bending test |
| 23 | 5.6.4 Minimum insulation thickness 5.7 Surveillance system 6 Marking 6.1 General 6.2 Steel service pipe |
| 24 | 6.3 Casing 6.4 Fitting assembly 6.5 Single use compensators |
| 25 | Annex A (informative)Guidelines for inspection and testing A.1 General A.2 Manufacturer’s type test A.3 Manufacturer’s quality control A.4 External inspection A.5 Extent of inspection A.6 Manufacturer’s responsibility |
| 28 | Annex B (informative)Procedures for polyethylene welding B.1 General B.2 Recommendations for site, machine and equipment B.3 Items B.4 Butt fusion welding B.4.1 Equipment |
| 29 | B.4.2 Welding procedure |
| 30 | B.5 Extrusion welding B.5.1 Equipment |
| 31 | B.5.2 Welding procedure |
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