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BS EN 488:2011+A1:2014

BS EN 488:2011+A1:2014

$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 2014 34
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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 insulated valve assemblies for continuous operation with hot water at various temperatures in accordance with EN 253:2009, Clause 1 and the valve assemblies with a maximum operation pressure of 25 bar. For higher pressures, additional demands apply.

Guidelines for quality inspection are given in Annex A of this European Standard.

NOTE 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 13941:2009+A1:2010.

PDF Catalog

PDF Pages PDF Title
6 Foreword
9 1 Scope
2 Normative references
10 3 Terms and definitions
11 Figure 1 — Example valve assembly components
4 Requirements
4.1 Pressure ratings for valves
4.1.1 General
12 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
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
13 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
14 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
Figure 3 — Main dimensions
15 4.6.4 Installation of measuring elements
4.7 Requirements for effective operation and maintenance
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
16 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
Table 2 — Overview and sequence of the type test programme
5.3.2.2 Leak-tightness of shell and stem casing
5.3.2.3 Leak-tightness of the seat
17 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
5.3.2.7 Bending test
18 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
19 5.3.3.4 Testing of steel welds
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
20 6.4 Valve assembly
7 Installation and maintenance
21 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
22 Table A.1 — Steel valve inspection
23 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 4)
26 Annex C (normative) Resistance to bending forces
C.1 Resistance to bending forces
C.1.1 General
C.1.2 Formulas based on the considerations
Table C.1 – Key for the formulas in C.1.1
27 Table C.2 – Key for the formulas in C.1.2 and Figures C.1 to C.4
C.1.3 Standard test assembly (four point bending test)
C.1.3.1 Bending moment from test load
28 C.1.3.2 Bending Moment from uniform load q (pipe weight and where appropriate water weight)
29 C.1.3.3 Bending moment from valve weight
C.1.3.4 Total Bending Moment (Mtotal) due to F, P and FV
30 C.1.4 Alternative test assembly (for diameters ≤ DN 200 mm) – Maximum bending moment
32 Bibliography

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BS EN 488:2011+A1:2014
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