BS EN 488:2019
$142.49
District heating pipes. Bonded single pipe systems for directly buried hot water networks. Factory made steel valve assembly for steel service pipes, polyurethane thermal insulation and a casing of polyethylene
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 30 |
This document specifies requirements and test methods for factory made thermally insulated bonded valve assemblies for hot water networks in accordance with EN 13941?1, comprising a steel valve, rigid polyurethane foam thermal insulation and a casing of polyethylene.
The valve assembly could also include the following additional elements: measuring wires, spacers and diffusion barriers.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 7 | 1 Scope 2 Normative references |
| 8 | 3 Terms and definitions 4 Requirements 4.1 Pressure ratings for valves 4.1.1 General 4.1.2 Valves without indicated flow direction 4.2 Service temperatures for valves 4.3 Steel parts 4.3.1 General 4.3.2 Valve 4.3.3 Valve extension pipe |
| 9 | 4.3.4 Welding ends 4.3.5 Welding of steel parts 4.4 Casing 4.4.1 General 4.4.2 Requirements for polyethylene welding 4.4.3 Diameter and wall thickness of the casing 4.5 Polyurethane (PUR) foam thermal insulation 4.5.1 General 4.5.2 Minimum thickness of thermal insulation 4.6 Valve assembly 4.6.1 Ends of valve assembly 4.6.1.1 General 4.6.1.2 Centre line deviation 4.6.1.3 Angular deviation |
| 10 | 4.6.2 End of stem construction 4.6.3 Main dimensions of the valve assembly |
| 11 | 4.6.4 Installation of measuring elements 4.7 Requirements for effective operation and maintenance |
| 12 | 4.8 Resistance to axial forces and bending moments 5 Testing, test methods and test requirements 5.1 General 5.2 Test specimens 5.2.1 General 5.2.2 Test specimens for type testing steel parts of valve 5.2.3 Test specimens from casings and thermal insulation 5.3 Steel parts 5.3.1 General 5.3.2 Type test of the steel parts 5.3.2.1 General |
| 13 | 5.3.2.2 Leak-tightness of shell and stem casing of the unloaded valve 5.3.2.3 Leak-tightness of the seat of the unloaded valve |
| 14 | 5.3.2.4 Torque load measurement of unloaded valve 5.3.2.5 Axial compressive force test 5.3.2.6 Axial tensile force test |
| 15 | 5.3.2.7 Bending test |
| 16 | 5.3.3 Production testing of valves 5.3.3.1 General 5.3.3.2 The leak-tightness test of the shell and stem casing 5.3.3.3 The leak-tightness test of the seat 5.3.3.4 Testing of steel welds 5.3.3.5 Torque load measurement of unloaded valve |
| 17 | 5.4 Casing 5.4.1 General 5.4.2 Leak-tightness of the welded casing 5.5 Polyurethane (PUR) foam thermal insulation 5.6 Valve assembly 5.7 Surveillance system 6 Marking 6.1 General 6.2 Steel valve |
| 18 | 6.3 Casing 6.4 Valve assembly 7 Installation and maintenance |
| 19 | 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 |
| 21 | Annex B (normative)Resistance to axial force and bending moment B.1 Axial strength test B.2 Bending test |
| 23 | Annex C (normative)Resistance to bending forces C.1 General |
| 24 | C.2 Standard test assembly (four point bending test) C.2.1 Bending moment due to test load F C.2.2 Bending Moment due to uniform load q (pipe weight and if applicable the medium weight) |
| 25 | C.2.3 Bending moment due to valve weight Fv |
| 26 | C.2.4 Total Bending Moment Mtotal due to F, P and FV C.2.5 Calculation of test force F |
| 27 | Annex D (informative)Waste treatment and recycling |
