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BS EN 253:2019 District heating pipes. Bonded single pipe systems for directly buried hot water networks. Factory made pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of polyethylene, 2019
- undefined
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Requirements [Go to Page]
- 4.1 General
- 4.2 Steel service pipe [Go to Page]
- 4.2.1 Specification
- 4.2.2 Diameter
- 4.2.3 Wall thickness
- 4.2.4 Surface condition
- 4.3 Casing [Go to Page]
- 4.3.1 Material properties [Go to Page]
- 4.3.1.1 Material composition
- 4.3.1.2 Melt mass-flow rate
- 4.3.1.3 Thermal stability
- 4.3.1.4 Use of rework material
- 4.3.2 Casing properties [Go to Page]
- 4.3.2.1 Nominal outside diameter
- 4.3.2.2 Wall thickness
- 4.3.2.3 Appearance, surface finish, casing ends
- 4.3.2.4 Elongation at break
- 4.3.2.5 Heat reversion
- 4.3.2.6 Stress crack resistance
- 4.4 Polyurethane (PUR) foam thermal insulation [Go to Page]
- 4.4.1 Composition
- 4.4.2 Cell structure [Go to Page]
- 4.4.2.1 General appearance
- 4.4.2.2 Cell size
- 4.4.2.3 Closed cell content
- 4.4.2.4 Voids and bubbles
- 4.4.3 Compressive strength
- 4.4.4 Foam density
- 4.4.5 Water absorption at elevated temperature
- 4.5 Pipe assembly [Go to Page]
- 4.5.1 General
- 4.5.2 Thermal insulation series
- 4.5.3 Pipe ends without thermal insulation
- 4.5.4 Diameter and wall thickness of the casing
- 4.5.5 Centre line deviation
- 4.5.6 Expected thermal life and long term temperature resistance [Go to Page]
- 4.5.6.1 General remarks
- 4.5.6.2 Shear strength
- 4.5.7 Thermal conductivity in unaged condition
- 4.5.8 Thermal conductivity at artificially aged condition
- 4.5.9 Impact resistance
- 4.5.10 Surface conditions at delivery
- 4.5.11 Measuring wires for surveillance systems
- 4.5.12 Linear water tightness
- 5 Test methods [Go to Page]
- 5.1 General conditions and test specimens [Go to Page]
- 5.1.1 General conditions
- 5.1.2 Test specimens
- 5.2 Casing [Go to Page]
- 5.2.1 Appearance and surface finish
- 5.2.2 Elongation at break
- 5.2.3 Carbon black dispersion, homogeneity
- 5.2.4 Stress crack resistance test
- 5.3 Polyurethane (PUR) foam thermal insulation [Go to Page]
- 5.3.1 Composition
- 5.3.2 Cell structure [Go to Page]
- 5.3.2.1 Cell size
- 5.3.2.2 Closed cell content
- 5.3.2.3 Voids and bubbles
- 5.3.3 Compressive strength
- 5.3.4 Foam density
- 5.3.5 Water absorption
- 5.4 Pipe assembly [Go to Page]
- 5.4.1 Axial shear strength [Go to Page]
- 5.4.1.1 Test specimen
- 5.4.1.2 Test procedure
- 5.4.1.3 Calculation of shear strength
- 5.4.1.4 Axial shear strength at 23 °C
- 5.4.1.5 Axial shear strength at 140 °C
- 5.4.2 Shear strength of the pipe assembly after ageing [Go to Page]
- 5.4.2.1 Specimen of pipe assembly for ageing
- 5.4.2.2 Test procedure
- 5.4.3 Thermal conductivity in unaged condition
- 5.4.4 Thermal conductivity at artificially aged condition
- 5.4.5 Impact resistance
- 5.4.6 Linear water tightness
- 6 Marking [Go to Page]
- 6.1 General
- 6.2 Steel service pipe
- 6.3 Casing
- 6.4 Pipe assembly
- Annex A (informative) Relation between actual continuous operating conditions and accelerated ageing test conditions [Go to Page]
- A.1 General
- A.2 Plateau in shear strength: impact of thermal stress
- A.3 Further decline in shear strength from plateau level
- A.4 Determination of Arrhenius activation energy on artificial pipe assembly
- A.5 Accelerated oxygen ingress on real pipe assembly in heated chamber
- Annex B (informative)Guidelines for inspection and testing [Go to Page]
- B.1 General
- B.2 Manufacturer's type test
- B.3 Manufacturer’s quality control
- B.4 External inspection
- B.5 Manufacturer's responsibility
- Annex C (normative) Thermal conductivity of factory made pipe assemblies — Test procedure [Go to Page]
- C.1 Scope
- C.2 Requirements (EN ISO 8497:1996, Clause 5) [Go to Page]
- C.2.1 Test specimen (EN ISO 8497:1996, 5.1)
- C.2.2 Operating temperature (EN ISO 8497:1996, 5.2)
- C.2.3 Types of apparatus (EN ISO 8497:1996, 5.5)
- C.3 Apparatus (EN ISO 8497:1996, Clause 7) [Go to Page]
- C.3.1 Guarded end apparatus
- C.3.2 Calibrated end apparatus
- C.3.3 Dimensions (EN ISO 8497:1996, 7.2)
- C.3.4 Heater pipe surface temperature
- C.4 Test specimens (EN ISO 8497:1996, Clause 8) [Go to Page]
- C.4.1 Conditioning (EN ISO 8497:1996, 8.4)
- C.4.2 Dimension measurement (EN ISO 8497:1996, 8.5)
- C.4.3 Surface temperature measurement
- C.4.4 Location of temperature sensors (EN ISO 8497:1996, 8.6)
- C.5 Procedure (EN ISO 8497:1996, Clause 9) [Go to Page]
- C.5.1 Test length (EN ISO 8497:1996, 9.1.1)
- C.5.2 Diameter (EN ISO 8497:1996, 8.5)
- C.5.3 Thickness of casing
- C.5.4 Ambient requirements (EN ISO 8497:1996, 9.2)
- C.5.5 Test pipe temperature (EN ISO 8497:1996, 9.3)
- C.5.6 Power supply (EN ISO 8497:1996, 7.9)
- C.5.7 Axial heat loss
- C.5.8 Test period and stability (EN ISO 8497:1996, 9.5.3)
- C.6 Calculations (EN ISO 8497:1996, Clause 11) [Go to Page]
- C.6.1 Thermal conductivity (EN ISO 8497:1996, 3.5)
- C.7 Symbols and units (EN ISO 8497:1996 Clause 4)
- Annex D (informative)Waste treatment and recycling [Go to Page]
