BS EN 488:2015
$167.15
District heating pipes. Preinsulated bonded pipe systems for directly buried hot water networks. Steel valve assembly for 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 valves of prefabricated thermally insulated valve assemblies comprising a steel valve, rigid polyurethane foam insulation and an outer casing of polyethylene for use in directly buried hot water networks with pre-insulated pipe assemblies in accordance with EN 253 .
This European Standard applies only to factory made prefabricated insulated valve assemblies for continuous operation with hot water at various temperatures in accordance with EN 253:2009+A2:2015, Clause 1, and the valve assemblies with a maximum operation pressure of 25 bar. For higher pressures, additional demands apply.
For this application, the following valve types are commonly used: ball valves, gate valves, and butterfly valves.
This European Standard does not include calculation rules for loads and stresses. These depend on the configuration of the system as it is installed. The design and installation rules are given in EN 13941 .
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 4 | Contents Page |
| 6 | European foreword |
| 7 | Introduction |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Terms and definitions |
| 10 | Figure 1 — Example valve assembly components 4 Requirements 4.1 Pressure ratings for valves 4.1.1 General 4.1.2 Valves without indicated flow direction |
| 11 | 4.2 Service temperatures for valves 4.3 Steel parts 4.3.1 General 4.3.2 Valve 4.3.3 Valve extension pipe 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 |
| 12 | 4.4.3 Diameter and wall thickness of the casing 4.5 Polyurethane rigid foam insulation (PUR) 4.5.1 General 4.5.2 Minimum insulation thickness 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 4.6.2 End of stem construction |
| 13 | Figure 2 — Anti corrosion protection of the stem construction 4.6.3 Main dimensions of the valve assembly Table 1 — Tolerances on the main valve dimensions |
| 14 | Figure 3 — Main dimensions 4.6.4 Installation of measuring elements 4.7 Requirements for effective operation and maintenance 4.8 Resistance to axial forces and bending moments |
| 15 | 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 polyurethane foam 5.3 Steel parts 5.3.1 General 5.3.2 Type test of the steel parts 5.3.2.1 General |
| 16 | Table 2 — Overview and sequence of the type test program 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 5.3.2.4 Torque load measurement of unloaded valve |
| 17 | 5.3.2.5 Axial compressive force test 5.3.2.6 Axial tensile force test |
| 18 | 5.3.2.7 Bending test |
| 19 | 5.3.3 Production testing of valves 5.3.3.1 General Table 3 — Overview of the production tests 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 |
| 20 | 5.4 Casing 5.4.1 General 5.4.2 Leak-tightness of the welded casing 5.5 Polyurethane rigid foam insulation 5.6 Valve assembly 5.7 Surveillance system 6 Marking 6.1 General 6.2 Steel valve 6.3 Casing |
| 21 | 6.4 Valve assembly 7 Installation and maintenance |
| 22 | 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 |
| 23 | Table A.1 — Steel valve inspection Table A.2 — Valve assembly inspection |
| 24 | Annex B (normative) Resistance to axial force and bending moment B.1 Axial strength test B.2 Bending test |
| 25 | Table B.1 — Service pipe dimensions, axial test forces and test bending moments |
| 26 | Annex C (normative) Resistance to bending forces C.1 General Table C.1 — Keys for the formulae in C.2 and Figures C.1 to C.3 |
| 27 | C.2 Standard test assembly (four point bending test) C.2.1 Bending moment due to test load F Figure C.1 — Bending moment due to test load F |
| 28 | C.2.2 Bending Moment due to uniform load q (pipe weight and if applicable the medium weight) Figure C.2 — Bending Moment due to uniform load q (pipe weight and applicable the medium weight) |
| 29 | C.2.3 Bending moment due to valve weight Fv Figure C.3 — Bending moment due to valve weight Fv C.2.4 Total Bending Moment Mtotal due to F, P and FV |
| 30 | C.2.5 Calculation of test force F |
| 31 | Bibliography |
Related products
-
BS EN 15698-2:2015
District heating pipes. Preinsulated bonded twin pipe systems for directly buried hot water networks –…
-
BS ISO 16488:2015
Marine finfish farms. Open net cage. Design and operation Published By Publication Date Number of…
-
BS ISO 18488:2015
Polyethylene (PE) materials for piping systems. Determination of Strain Hardening Modulus in relation to slow…
