BS EN 476:2011 pdf download
BS EN 476:2011 pdf download.General requirements for components used in drains and sewers.
— the minimum and maximum operahon temperatures (see 6.5) related to mechanical and internal pressure strength stated;
— material properties, e.g. creep, fatigue; and
— longitudinal bending resistance.
Product standards shall state rneLtiods by which resistance to internal and external loadings is assessed. This can be specified by crushing strength test, maximum load deformation test, internal and external pressure strength tests or by calculation. Values shall be declared.
Pipes can be defined as 1exIble. seml-rlgld or rigid as defined In Clause 3.
The failure load for flexible, semi-rigid or rigid pipes causes excessive deformation or rupture or unacceptable cracking of the pipes and can lead for example to; buckling of the wall, significant creep in the material. unacceptable cracking of coatings. loss of tightness in joints and reduction in hydraulic capacity.
6.1.2 LongitudInal bending moment resistance
Long rigid or seml-ngid pipes of small diameters shall have a satisfactory longitudinal bending moment
resistance. The values shall be specified in product standards and expressed in kN’m (see 7.3).
6.2 MechanIcal resistance of manholes, shafts and InspectIon chambers above the base unit
6.2.1 General
For manholes and nspeclion chambers appropriate strength requirements shall be specified in product standards. Mechanical behaviour of manholes can be specified by testing and/or calculation taking into account the long term behaviour. Crushing strength (kN/m), and/or axial load (kN/unit) and/or ring stiffness (kN!m2) classes if more than one, shall be separated by at least 20 % of the next lower class.
6.2.2 Circular sections
Circular sections shall have minimum crushing strengths and/or stiffness values, whichever is applicable, stated in product standards (see 7.2.2.1).
Rigid circular sections shall have a minimum crushing strength of 25 kN per metre length per metre internal diameter for nominal sizes less than or equal to DN 1000. For nominal sizes greater than DN 1000 the minimum crushing strength shall be 25 kN per metre length. or 30 kN per metre length if tested in a vertical position (see 7-2.2.1).
Flexible circular sections for use In carriageways. hard shoulders and parking areas shall have a minimum Initial stiffness value of 2.0 kNIm2.
6.2.3 Other shapes
Requirements for o(her shapes uf construction shall be comparable to the requirements ut 6.2.2 (see also 7.2.2.1).
6.2.4 Tapers, reducing and cover slabs
Requirements for tapers, reducing and cover slabs shall be specified in product standards. Tapers for manholes shall withstand the test load in accordance with EN 124 according to their place of installation (see 7.2.2.3).
6.13 DurabIlity
Product standards shall give details of characteristics which are relevant to the durabIity of the finished
product
6.14 Sealing elements
Sealing elements as specified by the component manufacturer shall usually be supplied together with the components.
6.15 Resistance against cleaning operations
Product standards shall provide jusbtyng statements concerning components for resistance against cleaning
Operation.
6.16 Handling
When equipped with handling devices (anchors, handling flngs). product standards shall provide justifying statements concerning pipes, fittings and manholes In order to ensure their safe handling.
7 Test methods
7.1 Measurement of dimensions
7.1.1 Mean Internal diameter of barrels
Where measurement of internal diameter Is a requirement of the product standard, it shall be carried out near to all ends of the component At least two measurements shall be taken near each end and the mean internal diameters calculated. The measurements shall be taken at approximately equal angular spacing. If an internal circumferential tape Is used, one measurement near each end is sufficient
7.1.2 Mean external diameter of barrels
Where measurement of external diameter is a requrement of the product standard, it shall be carried out near all ends of the component In a similar manner to that in 71.1 • or by calculation from the circumference near all ends of the component.
7.1.3 SpIgots and sockets
Where measurement of spigots arid sockets is a requirement of the product standard, it shall be carried out at the outside diameter of the spigot and the inside diametei’ of the socket. At least two measurements shall be taken near each end and the mean diameters calculated. If a circumferential tape is used, one measurement is sufficient
7.1.4 Wall thickness of barrels
Where measurement of wall thickness is a requirement of the product standard, it shall be carried out near all ends of the component Thickness of circular pipes shall be measured near each end with a minimum of three points. Thickness of non circular pipes shall be measured near each end with a minimum of four points. The measurements shall be taken at approximately equal angular spacing. Alternatively minimum and maximum values shall be determined near each end.
