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BS EN 448:2019

BS EN 448:2019

$167.15

District heating pipes. Bonded single pipe systems for directly buried hot water networks. Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of polyethylene

Published By Publication Date Number of Pages
BSI 2019 36
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This document specifies requirements and test methods for factory made thermally insulated bonded fitting assemblies for hot water networks in accordance with EN 13941?1, comprising a steel service fitting, rigid polyurethane foam thermal insulation and a casing of polyethylene.

The fitting assembly could also include the following additional elements: measuring wires, spacers and diffusion barriers.

This document covers the following fitting assemblies: bend, tee, reducer, single use compensator and anchor.

This document applies to fitting assemblies with a minimum design pressure of 1,6 MPa (overpressure).

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 European foreword
7 Introduction
8 1 Scope
2 Normative references
9 3 Terms and definitions
10 4 Requirements
4.1 Steel parts
4.1.1 General
4.1.2 Specification
4.1.3 Wall thickness and diameter
4.1.4 Bends
12 4.1.5 T-pieces
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
16 4.1.11 Surface condition
4.2 Casing
4.3 Polyurethane (PUR) foam thermal insulation
4.4 Fitting assemblies
4.4.1 Fitting ends
4.4.2 Angle between casing segments of bend and minimum length
17 4.4.3 Requirements of polyethylene welding
19 4.4.4 Leak-tightness of the welded casing
4.4.5 Diameter and wall thickness of the casing
4.4.6 Minimum thickness of the thermal insulation in bends
4.4.7 Tolerances of the main fitting dimensions
20 4.5 Surveillance system
5 Test methods
5.1 General
5.2 Test specimens
21 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 (PUR) foam thermal insulation
5.6 Fitting assemblies
5.6.1 Centre line deviation and angular deviation
5.6.2 Visual examination of welds on casing
5.6.3 Bending test
23 5.6.4 Minimum thickness of the thermal insulation
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
29 Annex B (informative) Procedures for casing welding
33 Annex C (informative) Waste treatment and recycling
34 Bibliography

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BS EN 448:2019
$167.15