BS/EN 295-6-2013 pdf download.Vitrified clay pipes systems for drain and sewers Part 6: Requirements for components of manholes and inspection chambers.
3.2
inspection chamber
chamber with a removable cover constructed on a drain or sewer that permits the introduction of cleaning and inspection equipment from surface level, but does not provide access for personnel
ISOURCE: EN 752:2008, 3.34)
Note 1 to entry: Examples of vitnfied clay Enspechon chambers are given in Figure A,2.
4 Requirements for components for manholes and inspection chambers
4.1 Materials, manufacture, water absorption and appearance
4.1.1 Vitrified clay
For material, manufacture, water absorption and appearance, all vitrified clay elements of manholes and
inspection chambers shall be in accordance with EN 295-1:2013, 5.1.
4.1.2 Rubber sealing material
Rubber sealing materials shall comply with EN 681-i
4.1.3 Polyurethane sealing materials
Polyurethane sealing elements shall be in accordance with EN 681-4.
4.1.4 Polypropylene couplings
Polypropylene couplings shall be in accordance with EN 295-1:2013, 6.1.3.
4.1.5 Materials of other components
Components of other materials which are used with vitrified clay manholes and inspection chambers shall comply with the relevant European Standard, European Technical Approval or the manufacturers’ declared specificabon, as applicable, which shall also include requirements for long term behaviour.
4.2 Internal diameter
4.2.1 Chamber rings and raising pieces
The internal diameter of chamber rings and raising pieces shall be in accordance with EN 295-1:2013, 5.2.
4.2.2 Pipeline connections
The internal diameter of pipeline connections from or to manholes shall be in accordance with EN 295-1:2013,
5.2.
4.3 Height
The nominal height of chamber rings and raising pieces shall be as specified by the manufacturer. The preferred heights are 250, 500, 750, 1 000 and 2 000 mm. The limits of tolerance on this height, measured to the nearest whole mm, shall be from —1 % to +4 %, or ± 10 mm, whichever is the larger.
4.4 Angle of curvature and radius of channel bends
The tolerance on the angle of curvature and radius of channel bends incorporated into manhole bases shall be in accordance with EN 295-1:2013, 5,7.
4.5 Branch angles of channel junctions
The tolerance at the branch angles of channel junctions Incorporated into manhole bases shall be in
accordance with EN 295-1:2013, 5.8.
4.6 Crushing strength (FN)
The crushing strength (FN) of chamber rings and raising pieces shall be in accordance with EN 295-1:2013,
5.9.
NOTE 1 Where components have been manufactured accordin9 to EN 296-1:2013. they do not need to be retested,
NOTE 2 For structural performance see Annex B.
4.7 Bending tensile strength
If it is required to determine the crushing strength where whole chamber rings and raising pieces are not available, for example after failure in use, a bending tensile strength test, in accordance with EN 295-3:2012, Clause 8. can be carried out on broken chamber rings and raising pieces.
The crushing strength shall be calculated from the mean bending tensile strength of at least ten test pieces.
4.8 Bond strength of adhesive used for fixing fired clay parts together
The bond strength of the adhesive used for fixing fired clay parts together shall be in accordance with
EN 295-1:2013. 5.12.
4.9 Fatigue strength under cyclic load
Where the resistance to fatigue under cyclic loads is required, it shall be demonstrated by testing in accordance with EN 295-3:2012, Clause 11, when test pieces shall not fail,
NOTE For charler rings or raising pieces, vitrified clay pipes in accordance with EN 295-1 are typically used.
4.10 Chemical resistance
When tested in accordance with EN 295-3:2012, Clause 13, the loss of material from the test piece shall be declared.
NOTE 1 Under normal condiboris of use, vitrified clay pipes are considered to be resistant to chemical attack and expected to show typical values of loss of matenal between 0.1 $ and 0,25 %.
NOTE 2 For chanter rings or raising pieces vitrified clay pipes in accordance with EN 295-1 are typically used
4.11 Water tightness of assembled components
When subjected to the test conditions specified in EN 295-3:2012, Clause 26, assembled components manholes and inspection chambers joined by the means specified in 412 shall show no visible leakage of
water from the body or Joints after a time period of 15( mm and the water needed to maintain the level shall not be greater than 0,04 1m2 of internal surface area.BS/EN 295-6-2013 pdf download.