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eLibrary > BS EN 488:2011+A1:2014 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 >

BS EN 488:2011+A1:2014 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, 2014

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BS EN 488:2011+A1:2014 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, 2014

64_e_stf.pdf [Go to Page]
Foreword
1 Scope
2 Normative references
3 Terms and definitions
Figure 1 — Example valve assembly components
4 Requirements [Go to Page]
4.1 Pressure ratings for valves [Go to Page]
4.1.1 General
4.1.2 Valves without indicated flow direction
4.2 Service temperatures for valves
4.3 Steel parts [Go to Page]
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 [Go to Page]
4.4.1 General
4.4.2 Requirements for polyethylene welding
4.4.3 Diameter and wall thickness of the casing
4.5 Polyurethane rigid foam insulation (PUR) [Go to Page]
4.5.1 General
4.5.2 Minimum insulation thickness
4.6 Valve assembly [Go to Page]
4.6.1 Ends of valve assembly [Go to Page]
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
Figure 2 — Anti corrosion protection of the stem construction [Go to Page]
4.6.3 Main dimensions of the valve assembly
Table 1 — Tolerances on the main valve dimensions
Figure 3 — Main dimensions [Go to Page]
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 [Go to Page]
5.1 General
5.2 Test specimens [Go to Page]
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 [Go to Page]
5.3.1 General
5.3.2 Type test of the steel parts [Go to Page]
5.3.2.1 General
Table 2 — Overview and sequence of the type test programme [Go to Page]
5.3.2.2 Leak-tightness of shell and stem casing
5.3.2.3 Leak-tightness of the seat
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
5.3.3 Production testing of valves [Go to Page]
5.3.3.1 General
Table 3 — Overview of the production tests [Go to Page]
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
5.4 Casing [Go to Page]
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 [Go to Page]
6.1 General
6.2 Steel valve
6.3 Casing
6.4 Valve assembly
7 Installation and maintenance
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
Table A.1 — Steel valve inspection
Table A.2 — Valve assembly inspection
Annex B (normative) Resistance to axial force and bending moment
B.1 Axial strength test
B.2 Bending test
Table B.1 — Service pipe dimensions, axial test forces and test bending moments 4)
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
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
C.1.3.2 Bending Moment from uniform load q (pipe weight and where appropriate water weight)
C.1.3.3 Bending moment from valve weight
C.1.3.4 Total Bending Moment (Mtotal) due to F, P and FV
C.1.4 Alternative test assembly (for diameters ≤ DN 200 mm) – Maximum bending moment
Bibliography [Go to Page]

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BS EN 488:2011+A1:2014 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, 2014

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