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eLibrary > BS EN 448:2015 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 >

BS EN 448:2015 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, 2015

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BS EN 448:2015 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, 2015

Contents Page
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements [Go to Page]
4.1 Steel parts [Go to Page]
4.1.1 General
4.1.2 Quality
4.1.3 Wall thickness and diameter
4.1.4 Bends [Go to Page]
4.1.4.1 Butt welding bends
4.1.4.2 Cold formed bends
4.1.4.3 Hot-formed bends
4.1.4.4 Tolerances of bending angles
4.1.5 T-pieces [Go to Page]
4.1.5.1 Forged T-pieces
4.1.5.2 Welding saddles
4.1.5.3 Welded T-pieces
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 [Go to Page]
4.1.10.1 Filler material
4.1.10.2 Welding process
4.1.10.3 Preparation for welding
4.1.10.4 Inspection of welds
4.1.10.5 Competence of the welder
4.1.11 Surface condition
4.2 Casing
4.3 Polyurethane rigid foam insulation (PUR)
4.4 Fitting assemblies [Go to Page]
4.4.1 Fitting ends [Go to Page]
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
4.4.3 Requirements of polyethylene welding [Go to Page]
4.4.3.1 General
4.4.3.2 Melt flow rate
4.4.3.3 Visual appearance
4.4.3.4 Bending test
4.4.4 Leak-tightness of the welded casing pipe
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 [Go to Page]
5.1 General
5.2 Test specimens
5.3 Steel parts [Go to Page]
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
5.3.5 NDT of welds
5.4 Casing
5.5 Polyurethane rigid foam insulation (PUR)
5.6 Fitting assemblies [Go to Page]
5.6.1 Centre line deviation and angular deviation
5.6.2 Visual examination of welds on casing pipes
5.6.3 Bending test
5.6.4 Minimum insulation thickness
5.7 Surveillance system
6 Marking [Go to Page]
6.1 General
6.2 Steel service pipe
6.3 Casing
6.4 Fitting assembly
6.5 Single use compensators
Annex A (informative)Guidelines for inspection and testing [Go to Page]
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
Annex B (informative)Procedures for polyethylene welding [Go to Page]
B.1 General
B.2 Recommendations for site, machine and equipment
B.3 Items
B.4 Butt fusion welding [Go to Page]
B.4.1 Equipment
B.4.2 Welding procedure
B.5 Extrusion welding [Go to Page]
B.5.1 Equipment
B.5.2 Welding procedure [Go to Page]

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BS EN 448:2015 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, 2015

⨯To continue with accurate pricing,
please select your company type below: