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eLibrary > BS EN 17878-1:2024 District heating pipes. Factory made flexible pipe systems with a lower temperature profile - Classification, general requirements and test methods >

BS EN 17878-1:2024 District heating pipes. Factory made flexible pipe systems with a lower temperature profile - Classification, general requirements and test methods, 2024

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1 Scope
2 Normative references
3 Terms, definitions and symbols [Go to Page]
3.1 Terms and definitions
3.2 Symbols, indices and abbreviations
4 Classification
5 Design requirements [Go to Page]
5.1 Thermal insulation properties
5.2 Bending test [Go to Page]
5.2.1 Flexibility
5.2.2 Ovality
5.2.3 Cracks
5.3 Resistance to external load [Go to Page]
5.3.1 Ring stiffness
5.3.2 Impact resistance
5.4 Thermal insulation [Go to Page]
5.4.1 Compressive creep
5.4.2 Water absorption at elevated temperatures
5.4.3 Density of thermal insulation [Go to Page]
5.4.3.1 General
5.4.3.2 Bonded system
5.4.3.3 Non bonded system
5.5 Casing [Go to Page]
5.5.1 UV stability
5.5.2 Thermal stability of the material
5.5.3 Stress crack resistance of the material
5.5.4 Use of rework material
5.6 Surveillance systems
6 Test methods [Go to Page]
6.1 General
6.2 Bending test [Go to Page]
6.2.1 Flexibility
6.2.2 Ovality test
6.2.3 Cracks in the thermal insulation
6.3 Compressive creep [Go to Page]
6.3.1 General
6.3.2 Principles of testing
6.3.3 Test apparatus
6.3.4 Test specimens [Go to Page]
6.3.4.1 Dimensions
6.3.4.2 Origin and count of test specimens
6.3.4.3 Preparation of the specimen
6.3.5 Test procedure
6.3.6 Test force and expression of results
7 Marking [Go to Page]
7.1 General marking aspects
7.2 Minimum marking information
8 Manufacturer's information
Annex A (normative)Thermal conductivity of factory made pipes – Test procedure [Go to Page]
A.1 General
A.2 Requirements [Go to Page]
A.2.1 Test specimen
A.2.2 Operating temperature
A.2.3 Types of apparatus
A.3 Apparatus [Go to Page]
A.3.1 Guarded end apparatus
A.3.2 Calibrated end apparatus
A.3.3 Dimensions
A.3.4 Heater pipe surface temperature
A.4 Test specimen [Go to Page]
A.4.1 Conditioning
A.4.2 Surface temperature measurement
A.4.3 Location of temperature sensors
A.5 Procedure [Go to Page]
A.5.1 Test length
A.5.2 Diameter and dimension measurement
A.5.3 Thickness of casing
A.5.4 Ambient requirements
A.5.5 Test pipe temperature
A.5.6 Power supply
A.5.7 Axial heat loss
A.5.8 Test period and stability
A.6 Calculations – Thermal conductivity
Annex B (informative)Determination of design values for the radial thermal resistance
Annex C (informative)Guidelines for inspection and testing [Go to Page]

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